# Patent

## Title
Array of sanitary tissue products

## Abstract

An array of sanitary tissue products, for example an array of toilet tissue products, wherein one of the sanitary tissue products exhibits a total dry tensile strength that is greater than another sanitary tissue product within the array, and a process for making such an array, is provided.

## Background
CROSS REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Application No. 60/903,257 filed Feb. 23, 2007.


FIELD OF THE INVENTION
The present invention relates to an array of sanitary tissue products, for example an array of toilet tissue products, wherein one of the sanitary tissue products exhibits a total dry tensile strength that is greater than another sanitary tissue product within the array, and a process for making such an array.
BACKGROUND OF THE INVENTION
Sanitary tissue products, especially toilet tissue products, have in the past been marketed based on the products' softness properties, as evidenced by the word “soft,” “softer,” and/or “softness,” being present on packages housing the products and/or on marketing elements, such as advertisements, touting the properties of the products.
In the past, manufacturers and marketers of sanitary tissue products, especially toilet tissue products, have been hesitant to market their sanitary tissue products, especially toilet tissue products, based on the products' strength, such as total dry tensile strength. It is clearly evident from packages of sanitary tissue products that manufacturers and/or marketers of sanitary tissue products have refrained from identifying strength, such as total dry tensile strength, as a dominant intensive property exhibited by their sanitary tissue products. For example, manufacturers and/or marketers have refrained from using strength indicia on their packages unless the strength indicia is not the dominant indicia. In other words, manufacturers and marketers have not marketed toilet tissue products with the word “strong,” “stronger,” “strongest,” and/or “strength” by itself. When used, it is paired with some indicia relating to “softness.” The reason for this past behavior of manufacturers and marketers of sanitary tissue products, especially toilet tissue products, is apparently that consumers didn't want to associate strength and/or strong with their toilet tissue products unless it was also buffered by the thought of soft and/or softness.
It has unexpectedly been found that some consumers of sanitary tissue products, especially toilet tissue products, desire strength, as a dominant intensive property, within their sanitary tissue products, especially toilet tissue products.
Accordingly, there is a need for an array of sanitary tissue products, for example toilet tissue products, that comprises a sanitary tissue product, for example a toilet tissue product, that exhibits a greater total dry tensile strength than another sanitary tissue product, for example a toilet tissue product, within the array and a process for making such an array.
SUMMARY OF THE INVENTION
The present invention fulfills the needs described above by providing an array of sanitary tissue products, for example toilet tissue products, wherein one of the sanitary tissue products exhibits a total dry tensile strength that is greater than another sanitary tissue product within the array, and a process for making such an array.
In one example of the present invention, an array of sanitary tissue products, especially toilet tissue products, comprising a first sanitary tissue product and a second sanitary tissue product, wherein the first sanitary tissue product is housed within a package comprising a dominant strength indicia and wherein the first and second sanitary tissue products are each separately housed within packages comprising a common brand name.
In another example of the present invention, an array of sanitary tissue products, especially toilet tissue products, comprising a first sanitary tissue product and a second sanitary tissue product, wherein the first sanitary tissue product exhibits a total wet tensile strength of less than about 200 g/in and a total dry tensile strength that is greater than the total dry tensile strength of the second sanitary tissue product, wherein the first sanitary tissue product is housed within a package comprising a dominant strength indicia, is provided.
In another example of the present invention, an array of sanitary tissue products, especially toilet tissue products, comprising a first sanitary tissue product and a second sanitary tissue product, wherein the first sanitary tissue product exhibits a total dry tensile strength of less than about 1000 g/in and is at least 20% greater than the total dry tensile strength of the second sanitary tissue product, is provided.
In even another example of the present invention, a process for making an array of sanitary tissue products, especially toilet tissue products, the process comprises the steps of:
a. providing a first sanitary tissue product;
b. providing a second sanitary tissue product different from the first, wherein the first sanitary tissue product exhibits a total dry tensile strength that is greater than the total dry tensile strength of the second sanitary tissue product; and
c. packaging the first and second sanitary tissue products in separate packages comprising a common brand name, wherein the package housing the first sanitary tissue product further comprises a dominant strength indicia, is provided.
In still another example of the present invention, a process for making an array of sanitary tissue products, especially toilet tissue products, the process comprises the steps of:
a. providing a first sanitary tissue product;
b. providing a second sanitary tissue product different from the first, wherein the first sanitary tissue product exhibits a total dry tensile strength that is at least 20% greater than the total dry tensile strength of the second sanitary tissue product; and
c. packaging the first and second sanitary tissue products in separate packages comprising a common brand name, is provided.
Accordingly, the present invention provides an array of sanitary tissue products, especially toilet tissue products, and a process for making the array.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic illustration of a sanitary tissue product according to the present invention;
FIG. 2 is a schematic illustration of another sanitary tissue product according to the present invention;
FIG. 3 is a schematic illustration of an array of sanitary tissue products according to the present invention;
FIG. 4 is an illustration of the Commission Internationale de l'Eclairage L*a*b* color space (CIELab).



DETAILED DESCRIPTION OF THE INVENTION
Definitions
“Fiber” as used herein means an elongate particulate having an apparent length greatly exceeding its apparent diameter, i.e. a length to diameter ratio of at least about 10. Fibers having a non-circular cross-section are common; the “diameter” in this case may be considered to be the diameter of a circle having cross-sectional area equal to the cross-sectional area of the fiber. More specifically, as used herein, “fiber” refers to fibrous structure-making fibers. The present invention contemplates the use of a variety of fibrous structure-making fibers, such as, for example, natural fibers, including wood fibers, or synthetic fibers made from natural polymers and/or synthetic fibers, or any other suitable fibers, and any combination thereof.
“Fibrous structure” as used herein means a structure (web) that comprises one or more fibers. Nonlimiting examples of processes for making fibrous structures include known wet-laid fibrous structure making processes, air-laid fibrous structure making processes, meltblowing fibrous structure making processes, co-forming fibrous structure making processes, and spunbond fibrous structure making processes. Such processes typically include steps of preparing a fiber composition, oftentimes referred to as a fiber slurry in wet-laid processes, either wet or dry, and then depositing a plurality of fibers onto a forming wire or belt such that an embryonic fibrous structure is formed, drying and/or bonding the fibers together such that a fibrous structure is formed, and/or further processing the fibrous structure such that a finished fibrous structure is formed. The fibrous structure may be a through-air-dried fibrous structure and/or conventionally dried fibrous structure. The fibrous structure may be creped or uncreped. The fibrous structure may exhibit differential density regions or may be substantially uniform in density. The fibrous structure may be pattern densified, conventionally felt-presses and/or high-bulk, uncompacted. The fibrous structures may be homogenous or multilayered in construction.
After and/or concurrently with the forming of the fibrous structure, the fibrous structure may be subjected to physical transformation operations such as embossing, calendering, selfing, printing, folding, softening, ring-rolling, applying additives, such as latex, lotion and softening agents, combining with one or more other plies of fibrous structures, and the like to produce a finished fibrous structure that forms and/or is incorporated into a sanitary tissue product.
“Sanitary tissue product” as used herein means a wiping implement for post-urinary and/or post-bowel movement cleaning (toilet tissue products), for otorhinolaryngological discharges (facial tissue products) and/or multi-functional absorbent and cleaning uses (absorbent towels such as paper towel products and/or wipe products).
The sanitary tissue products of the present invention may comprise one or more fibrous structures and/or finished fibrous structures.
The sanitary tissue products of the present invention may exhibit a basis weight between about 10 g/m2 to about 120 g/m2 and/or from about 15 g/m2 to about 110 g/m2 and/or from about 20 g/m2 to about 100 g/m2 and/or from about 30 to 90 g/m2. In addition, the sanitary tissue product of the present invention may exhibit a basis weight between about 40 g/m2 to about 120 g/m2 and/or from about 50 g/m2 to about 110 g/m2 and/or from about 55 g/m2 to about 105 g/m2 and/or from about 60 to 100 g/m2.
The sanitary tissue products of the present invention may exhibit a total dry tensile strength of greater than about 59 g/cm (150 g/in) and/or from about 78 g/cm (200 g/in) to about 394 g/cm (1000 g/in) and/or from about 98 g/cm (250 g/in) to about 335 g/cm (850 g/in). In addition, the sanitary tissue product of the present invention may exhibit a total dry tensile strength of greater than about 196 g/cm (500 g/in) and/or from about 196 g/cm (500 g/in) to about 394 g/cm (1000 g/in) and/or from about 216 g/cm (550 g/in) to about 335 g/cm (850 g/in) and/or from about 236 g/cm (600 g/in) to about 315 g/cm (800 g/in). In one example, the sanitary tissue product exhibits a total dry tensile strength of less than about 394 g/cm (1000 g/in) and/or less than about 335 g/cm (850 g/in). Two or more sanitary tissue products within an array of sanitary tissue products according to the present invention may exhibit different total dry tensile strengths.
In one example, one sanitary tissue product in an array of sanitary tissue products according to the present invention exhibits a total dry tensile strength of greater than 216 g/cm (550 g/in) and another sanitary tissue product within the array exhibits a total dry tensile strength of less than 216 g/cm (550 g/in).
In another example, the sanitary tissue products of the present invention may exhibit a total dry tensile strength of greater than about 315 g/cm (800 g/in) and/or greater than about 354 g/cm (900 g/in) and/or greater than about 394 g/cm (1000 g/in) and/or from about 315 g/cm (800 g/in) to about 1968 g/cm (5000 g/in) and/or from about 354 g/cm (900 g/in) to about 1181 g/cm (3000 g/in) and/or from about 354 g/cm (900 g/in) to about 984 g/cm (2500 g/in) and/or from about 394 g/cm (1000 g/in) to about 787 g/cm (2000 g/in).
The sanitary tissue products of the present invention may exhibit a total wet tensile strength of less than about 78 g/cm (200 g/in) and/or less than about 59 g/cm (150 g/in) and/or less than about 39 g/cm (100 g/in) and/or less than about 29 g/cm (75 g/in).
The sanitary tissue products of the present invention may exhibit a density of less than about 0.60 g/cm3 and/or less than about 0.30 g/cm3 and/or less than about 0.20 g/cm3 and/or less than about 0.10 g/cm3 and/or less than about 0.07 g/cm3 and/or less than about 0.05 g/cm3 and/or from about 0.01 g/cm3 to about 0.20 g/cm3 and/or from about 0.02 g/cm3 to about 0.10 g/cm3.
The sanitary tissue products of the present invention may be in any suitable form, such as in a roll, in individual sheets, in connected, but perforated sheets, in a folded format or even in an unfolded.
The sanitary tissue products of the present invention may comprises additives such as softening agents, temporary wet strength agents, permanent wet strength agents, bulk softening agents, lotions, silicones, and other types of additives suitable for inclusion in and/or on sanitary tissue products.
“Array of sanitary tissue products” as used herein means a group of sanitary tissue products that provide a similar benefit to a consumer. In other words, an array of sanitary tissue products includes a group of sanitary tissue products within a category such as paper towels, toilet tissue, facial tissue, wipes. In one case, such a group of sanitary tissue products includes those sanitary tissue products that reside on the same shelf in a retail store and/or in the same aisle in a retail store. For example, toilet tissue products are an array of sanitary tissue products, as are paper towel products. In one example, an array of sanitary tissue products comprise two or more and/or three or more sanitary tissue products that are packaged in packages that comprise a common brand name and/or trademark. For example, an array of sanitary tissue products may comprise sanitary tissue products all package in packages that comprise the common brand name Charmin®.
“Ply” or “plies” as used herein means an individual finished fibrous structure optionally to be disposed in a substantially contiguous, face-to-face relationship with other plies, forming a multiple ply (“multi-ply”) sanitary tissue product. It is also contemplated that a single-ply sanitary tissue product can effectively form two “plies” or multiple “plies”, for example, by being folded on itself.
“Machine Direction” or “MD” as used herein means the direction parallel to the flow of the fibrous structure through the papermaking machine and/or product manufacturing equipment. In one example, once incorporated into a sanitary tissue product, the MD of the fibrous structure may be the MD of the sanitary tissue product.
“Cross Machine Direction” or “CD” as used herein means the direction perpendicular to the machine direction in the same plane of the fibrous structure. In one example, once incorporated into a sanitary tissue product, the CD of the fibrous structure may be the CD of the sanitary tissue product.
“Intensive property” as used herein means a property of a fibrous structure and/or sanitary tissue product, wherein the property is selected from the group consisting of: lint, softness, basis weight, texture, tensile strength, especially total dry tensile strength, absorbency and mixtures thereof.
“Common intensive property” as used herein means an intensive property that is present in two or more fibrous structures and/or sanitary tissue products.
“Value of a common intensive property” as used herein means a measured value of a common intensive property present in each of two or more fibrous structures and/or sanitary tissue products.
“Dominant common intensive property” as used herein means the greatest of two or more values of a common intensive property. For example, if one sanitary tissue product exhibits a total dry tensile strength of about 650 g/in and another sanitary tissue product exhibits a total dry tensile strength of about 500 g/in, then the dominant common intensive property is the 650 g/in and the sanitary tissue product that exhibits a total dry tensile strength of about 650 g/in exhibits the dominant common intensive property. In other words, one of the sanitary tissue products exhibits greater total dry tensile strength than the other sanitary tissue product. In one example, in order for a common intensive property of one sanitary tissue product to be a dominant common intensive property compared to another sanitary tissue product, the difference in the values of the common intensive properties of the sanitary tissue products has to be greater than about 5% and/or greater than about 10% and/or greater than about 15% and/or greater than about 20% and/or greater than about 25% and/or greater than about 30% and/or greater than about 50%.
In another example, if one sanitary tissue product exhibits a softness of about 0 psu and another sanitary tissue product exhibits a softness of +0.5 psu then the sanitary tissue product that exhibits a softness of about +0.5 psu exhibits the dominant common intensive property; namely softness. In other words, one of the sanitary tissue products is softer than the other sanitary tissue product. Relative values between sanitary tissue products, such as one sanitary tissue product is softer than another sanitary tissue product may be used to identify the dominant common intensive property in addition to the absolute values of common intensive properties.
“Relative value of a common intensive property” as used herein means the value of a common intensive property of one fibrous structure and/or sanitary tissue product compared to the value of the common intensive property in another fibrous structure and/or sanitary tissue product. For example, the value of a common intensive property of one fibrous structure and/or sanitary tissue product may be greater or less than the value of the common intensive property of another fibrous structure and/or sanitary tissue product.
“Communicated” as used herein means conveyance of information to a consumer about a product by way of a package housing the product and/or by the product itself by an indicia. In one example, the information about the product may be conveyed intuitively to a consumer by a non-textual indicia.
“Intuitively communicated” as used herein means a package and/or sanitary tissue product, itself, comprising a non-textual indicia, conveys information by the non-textual indicia that a consumer interprets based on the consumer's previous life experiences and/or knowledge.
“Indicia” as used herein means a identifier and/or indicator and/or hint and/or suggestion, of the nature of a property of something, such as an intensive property of a sanitary tissue product.
“Dominant indicia” as used herein means that a package and/or sanitary tissue product, itself, within an array of packages and/or sanitary tissue products comprises an indicia that is not present on another package and/or sanitary tissue product, itself, within the array or that is emphasized more on the package and/or sanitary tissue product than any other indicia. For example, a package housing a sanitary tissue product may comprise only indicia that communicates the intensive property of strength, such as total dry tensile strength, to a consumer so that strength would be the dominant indicia of that package. In another example, a package housing a sanitary tissue product may comprise the phrase “soft and strong” all in the same font and same color—there would be no dominant indicia based on this phrase. However, if the phrase was “soft and STRONG” where the word strong was somehow emphasized to stand out so that a consumer would interpret the dominant intensive property of the sanitary tissue product to be strength, such as total dry tensile strength, then strength or strong would be the dominant indicia. In still another example, if one package comprises the indicia “soft and strong” and another package within an array of packages comprises the indicia “soft and absorbent”, then strong is the dominant indicia on the first package and absorbent is the dominant indicia on the second package.
“Dominant strength indicia” as used herein means that strength, such as total dry tensile strength, is the dominant indicia.
“Textual indicia” as used herein means a text indicia, such as a word and/or phrase that communicates to a consumer a property about the sanitary tissue product it is associated with. In one example, a sanitary tissue product, such as a toilet tissue product, is housed in a package comprising a textual indicia; namely, the word “Strong.”
“Brand name” as used herein means a single source identifier, in other words, a brand name identifies a product and/or service as exclusively coming from a single commercial source (i.e., company). An example of a brand name is Charmin®, which is also a trademark. Brand names are nonlimiting examples of textual indicia. The sanitary tissue products of the present invention may be marketed and/or packaged under a common brand name (i.e., the same brand name, such as Charmin®). In addition to the brand name, a product descriptor may also be associated with the sanitary tissue products, such as “Ultra Strong” and/or “Ultra Soft” for example).
“Non-textual indicia” as used herein means a non-text indicia that communicates to a consumer through a consumer's senses. In one example, a non-textual indicia may communicate, even intuitively communicate, to a consumer through sight (visual indicia), through touch (texture indicia) and/or through smell (scent indicia).
Nonlimiting examples of non-textual indicia include colors, textures, patterns, such as emboss patterns and/or emboss pattern images, character representations, action representations, and mixture thereof.
“Psychologically matched” as used herein means that a non-textual indicia on a package housing a sanitary tissue product of the present invention and/or on the sanitary tissue product, itself, denotes (i.e., serves as a symbol for; signifies; represents something) an intensive property of the sanitary tissue product. For example, the color red typically denotes strength, the color blue typically denotes softness, the color pink typically denotes softness and the color green typically denotes absorbency. Therefore, a consumer of sanitary tissue products can identify and/or select a package of sanitary tissue product that exhibits a dominant common intensive property of strength, wherein the package comprises a non-textual indicia psychologically matched (such as the color red) to communicate to the consumer that the sanitary tissue products exhibits strength as its dominant common intensive property. The psychologically matched non-textual indicia aids in mitigating any confusion that the consumer may have when trying to identify and/or select a desired sanitary tissue product among an array of sanitary tissue products. The consumer is able to interpret the intuitive communication from the non-textual indicia to be consistent with the actual dominant intensive property of the sanitary tissue product.
“Psychologically different” as used herein means that two or more different non-textual indicia, such as the color blue and the color red, denote different intensive properties. For example, the color blue typically denotes softness whereas the color red typically denotes strength. In one example, in order to be psychologically different, the non-textual indicia cannot denote the same intensive property. For example, the color blue, which typically denotes softness, and the color pink, which typically denotes softness, are not psychologically different for the purposes of the present invention. Likewise, the color blue, which typically denotes softness, and the color purple, which typically denotes softness, are not psychologically different for the purposes of the present invention.
“Basis weight” as used herein is the weight per unit area of a sample reported in lbs/3000 ft2 or g/m2. The basis weight is measured herein by the Basis Weight Test Method described herein.
“Dry Tensile Strength” (or simply “Tensile Strength” as used herein) of a fibrous structure of the present invention and/or a sanitary tissue product comprising such fibrous structure is measured according to the Dry Tensile Strength Test Method described herein.
“Wet Tensile Strength” of a fibrous structure and/or a sanitary tissue product of the present invention is measured according to the Wet Tensile Strength Test Method described herein.
“Softness” as used herein means the softness of a fibrous structure according to the present invention and/or a sanitary tissue product comprising such fibrous structure, which is determined according to a human panel evaluation wherein the softness of a test product is measured versus the softness of a control or standard product. The resulting number is a relative measure of softness between the two fibrous structures and/or sanitary tissue products. The softness is measured herein by the Softness Test Method described herein.
“Absorbency” as used herein means the characteristic of a fibrous structure according to the present invention and/or a sanitary tissue product comprising such fibrous structure, which allows it to take up and retain fluids, particularly water and aqueous solutions and suspensions. In evaluating the absorbency of paper, not only is the absolute quantity of fluid a given amount of paper will hold significant, but the rate at which the paper will absorb the fluid is also. Absorbency is measured herein by the Horizontal Full Sheet (HFS) test method described in the Test Methods section herein.
“Lint” as used herein means any material that originated from a fibrous structure and/or sanitary tissue product of the present invention that remains on a surface after which the fibrous structure and/or sanitary tissue product has come into contact. The lint value of a fibrous structure and/or sanitary tissue product is determined according to the Lint Value Test Method described herein.
“Dust” as used herein means any material that originated from a fibrous structure and/or sanitary tissue product of the present invention that becomes airborne after the fibrous structure and/or sanitary tissue product has been subjected to a force. In one example, one sanitary tissue product in an array exhibits a dust value that is less than about 75% and/or less than about 60% and/or less than about 50% and/or less than about 30% and/or greater than about 0% of the dust value of another sanitary tissue product within the array. In one example, the sanitary tissue product that exhibits the lesser dust value exhibits the greater total dry tensile strength as compared to another sanitary tissue product within an array of sanitary tissue products.
“Texture” as used herein means any pattern present in the fibrous structure. For example, a pattern may be imparted to the fibrous structure during the fibrous structure-making process, such as during a through-air-drying step. A pattern may also be imparted to the fibrous structure by embossing the finished fibrous structure during the converting process and/or by any other suitable process known in the art.
“Color” as used herein, means a visual effect resulting from a human eye's ability to distinguish the different wavelengths or frequencies of light. The apparent color of an object depends on the wavelength of the light that it reflects. While a wide palette of colors can be employed herein, it is preferred to use a member selected from the group consisting of orange, purple, lavender, red, green, blue, yellow, and violet. The method for measuring color is described in the Color Test Method described herein.
Sanitary Tissue Product and Package
A sanitary tissue product according to the present invention may be housed within a package comprising an indicia. In one example, the indicia is a dominant indicia.
As shown in FIG. 1, in one example, a package 10 for housing a sanitary tissue product (not shown) comprises a non-textual indicia 12 that is psychologically matched to an intensive property of a sanitary tissue product to be housed in the package 10. The indicia 12 may be on a surface 14 of the package 10.
The package 10 may be made from any suitable packaging material 16 known in the art. Nonlimiting examples include polywrap, polymer films, such as polyolefin films, polyester films, paper, cardboard, plastic, wood, metal and other suitable packaging materials. In one example, the package 10 comprises a polyolefin film. In another example, the package 10 comprises a polyester film. In still another example, the package 10 comprises cardboard.
In addition to the indicia 12, the package 10 may further comprise a brand name and/or single source identifier 18, such as a trademark, as represented by “BRAND” in FIG. 1. The brand name 18 may be positioned entirely or partially within the indicia 12, for example if the indicia 12 comprises a non-textual indicia such as a color. In another example, the brand name 18 may be discrete from the indicia 12.
As shown in FIG. 2, in another example, a package 10 for housing a sanitary tissue product 20 may be made such that a surface 22 of the a sanitary tissue product 20 housed within the package 10 is visible to a consumer at the point of sale and/or in advertising. The sanitary tissue product 20 may comprise an indicia 12, for example a non-textual indicia such as an emboss pattern, that is psychologically matched to an intensive property of the sanitary tissue product 20. For example, the sanitary tissue product may comprise a diamond emboss pattern.
Array of Sanitary Tissue Products
An array of sanitary tissue products according to the present invention may comprise two or more sanitary tissue products.
As shown in FIG. 3, in one example, an array of sanitary tissue products 24 (displayed on a store shelf 25 for example) housed within different packages 26, 28, 30. The first sanitary tissue product housed within the first package 26 exhibits a value of a common intensive property that is different from the second sanitary tissue product housed within the second package 28. In one example, the first sanitary tissue product's value of the common intensive property is the dominant common intensive property. The relative value of the common intensive property of the first sanitary tissue product compared to the second sanitary tissue product is communicated to a consumer of sanitary tissue products by non-textual indicia 32, 34. The non-textual indicia 32 may be psychologically matched to a dominant common intensive property present in the first sanitary tissue product. The non-textual indicia 34 may be psychologically matched to a dominant common intensive property present in the second sanitary tissue product. In one example, the non-textual indicia 32 is psychologically different from the non-textual indicia 34.
In addition to the first and second sanitary tissue products within the array, the array may further comprise a third sanitary tissue product. The third sanitary tissue product may exhibit a value of a common intensive property that is the same and/or different from the value of the common intensive property in the first sanitary tissue product and the second sanitary tissue product. The third sanitary tissue product may be housed within a package 30 that comprises a non-textual indicia 36. The non-textual indicia 36 may be psychologically matched to an intensive property of the third sanitary tissue product. Further, the non-textual indicia 36 may be psychologically different from one or both non-textual indicia 32, 34.
In addition to non-textual indicia, the packages comprising the sanitary tissue products may further comprise textual indicia. Nonlimiting examples of textual indicia include text, such as brand names, which may be the same and/or they may be separate, independent product designations that reinforce and/or support the non-textual indicia present on the packages.
In one example, a package comprising a sanitary tissue product according to the present invention may comprise information about at least one or more, and/or two or more different sanitary tissue products within the array of sanitary tissue products.
In another example, a package comprising a sanitary tissue product may comprise information about various roll sizes in which the sanitary tissue product within the package is available to the consumer.
In one example, an array of sanitary tissue products in accordance with the present invention may comprise a plurality of single- and/or multi-ply sanitary tissue products. The sanitary tissue products may be dry and/or wet. The sanitary tissue products may come in a variety of roll sizes and may be packaged in different numbers, such as four, six, nine, twenty-four, and the like. The array of sanitary tissue products may displayed on a shelf at a point of sale, such as within a retail store, in such as way that the different sanitary tissue products within the array are visible to a consumer during the consumer's purchasing decision process.
The array of sanitary tissue products of the present invention may comprise two or more multi-ply sanitary tissue products, such as two or more two-ply sanitary tissue products. The array may comprise at least one single-ply sanitary tissue product. The array may comprise a mixture of single-ply and multi-ply sanitary tissue products.
The array of sanitary tissue products may comprise two or more sanitary tissue products each of which comprises at least one value of a common intensive property that is different from at least one or more of the others.
The array of sanitary tissue products may comprise a single-ply sanitary tissue product that comprises at least one value of a common intensive property that is different from at least one multi-ply sanitary tissue product within the array of sanitary tissue products.
The array of sanitary tissue products may comprises a single-ply sanitary tissue product that comprises at least one value of a common intensive property that is different from the two or more multi-ply sanitary tissue products within the array of sanitary tissue products.
The array of sanitary tissue products may comprise two or more single-ply sanitary tissue products each of which comprises at least one value of a common intensive property that is different from at least one or more of the others.
Two or more sanitary tissue products within an array of sanitary tissue products may differ in price, for example differ in retail price to a consumer.
In addition to the sanitary tissue product packages comprising non-textual indicia, marketing articles such as in-store ads, in-store flyers, print ads, periodical ads, billboards, end-of aisle displays, pallet wrappers, secondary packaging, corrugated boxes, shrink-wrap packaging, floor ads, window stick-on ads, shelf talkers, internet sites, etc., associated with the sanitary tissue products may also comprise non-textual indicia. The non-textual indicia on the marketing articles may be psychologically matched to intensive properties within the sanitary tissue products that the marketing articles are associated with. Further, the non-textual indicia on the marketing articles may be psychologically different. In one example, a marketing article, such as a billboard, comprises two non-textual indicia that are psychologically different and are psychologically matched to two different common intensive properties within two different sanitary tissue products.
Process for Displaying an Array of Sanitary Tissue Products
The array of sanitary tissue products in accordance with the present invention may be displayed by any suitable process and any suitable location, such as a retail store, for a consumer's viewing, identification, selection and/or purchasing.
Intuitive Communication
Non-limiting examples of non-textual, intuitive communication methods include: hand gestures and movements; stick figures or other animated characters demonstrating action; traffic sign shapes, lights, and arrows, body postures, facial expressions, eye movement, use of patterns, lines, curves, colors, etc. The human brain interprets these modes of non-textual, intuitive communication based on prior experiences, instinct, emotions and/or feelings that are generated within the human brain when it is exposed to these forms of non-textual, intuitive communication. Psychologists have spent many years developing an understanding of how the human brain interprets these modes of communication and how they support, speed-up and/or redefine interpretation of verbal and/or written communication. In the present invention, several modes of non-textual, intuitive communication may be used to speed up consumers' interpretation of written communication on a package, thereby reducing the time necessary for consumers to identify, evaluate, and select for purchase an intended sanitary tissue product within an array of sanitary tissue products.
Non-Textual, Intuitive Color Communication
One example of a non-textual, intuitive communication method for delineating intensive properties of a sanitary tissue product includes associating the sanitary tissue product and/or package within which the sanitary tissue product is housed with a prominent color that consumers associate with a particular mood, feeling, or state of mind (i.e., a color that is psychologically matched to an intensive property). This color can be displayed behind and around any text communication on the package, such as text indicating the common intensive property, or can be separately displayed on a surface of the package as a banner, swoosh, stripes, quilted fabrics, clouds, squares, circles, or other non-limiting two-dimensional geometric or graphic shapes, and combinations thereof.
Nonlimiting examples of packages suitable for use with the sanitary tissue products of the present invention are commercially available from Cello-Foil Products, Inc. and Superpac. In one example, non-textual indicia, such as colors, are applied to and/or made a part of film that forms the package by any suitable application process known in the art.
Table 1 lists appropriate colors, moods, and nonlimiting intensive properties that can be intuitively communicated via the appropriate use of these colors and psychologically matched to those colors.









TABLE 1







Psychologically Matched


Color
Color Meaning Examples
Intensive Property







Black
Liveless, danger, death
Strength


Grey
Dirty, cold
Strength, basis weight, lint


Blue
Calm, cool, relaxed
Soft, absorbency, lint


Pink
Calm, warm, relaxed
Soft, absorbency


Purple
Lush, rich, royal
Soft, absorbency, strong


Green
Natural, life, youth, vigor
Absorbent, durable, reusable


Red
Bold, Dominating
Strong, absorbency


Orange
Bright, Warm, Reassuring
Strong, absorbency, basis



Simple, Balanced
weight, ply


Yellow
Alert, Warm, Simple,
Strong, absorbency, basis



Balanced
weight, ply


White
Purity, clean
Absorbency, strong









Color Evaluation

Referring to FIG. 4, a color's identification is determined according to the Commission Internationale de l'Eclairage L*a*b* color space (hereinafter “CIELab”). CIELab is a mathematical tristimulus color scale based on the CIE 1976 standard. CIELab allows colors to be described quantitatively and with precision. As presented in FIG. 4, CIELab allows a color to be plotted in a three-dimensional space analogous to the Cartesian xyz space. CIELab has the colors green to red on what is traditionally the x-axis in Cartesian xyz space. CIELab identifies this axis as the a-axis. A negative a* value represents green and a positive a* value represents red. CIELab has the colors blue to yellow on what is traditionally the y-axis in Cartesian xyz space. CIELab identifies this axis as the b-axis. Negative b* values represent blue and positive b* values represent yellow. CIELab has lightness on what is traditionally the z-axis in Cartesian xyz space. CIELab identifies this axis as the L-axis. The L*-axis ranges in value from 100, which is white, to 0, which is black. An L* value of 50 represents a mid-tone gray (provided that a* and b* are 0). Any color may be plotted in CIELab according to the three values (L*, a*, b*).
The three dimensional CIELab allows the three color components of chroma, hue, and lightness to be calculated. Within the two-dimensional space formed from the a-axis and b-axis, the components of hue and chroma can be determined. Chroma is the relative saturation of the perceived color and is determined by the distance from the origin as measured in the a*b* plane. Chroma, for a particular (a*, b*) set is calculated according to Formula 1 as follows:

C*=(a*2+b*2)1/2  Formula 1

For example, a color with a*b* values of (10,0) would exhibit a lesser chroma than a color with a*b* values of (20,0). The latter color would be perceived qualitatively as being more red than the former. Hue is the relative red, yellow, green, and blue in a particular color. A ray can be created from the origin to any color within the two-dimensional a*b* space. Hue is the angle measured from 0° (the positive a* axis) to the created ray. Hue can be any value of between 0° to 360°. Lightness is determined from the L* value with higher values being more white and lower values being more black.
The testing and comparison of externally visible surfaces occurs between discrete elements of the package surface. A permissible comparison would be, for example, between the externally visible surface of the non-textual indicia intuitively communicating the intensive property and another element on the package surface, or if a significant portion of the package is transparent, of the product itself. Externally visible surfaces are tested for reflective color utilizing the method for measuring color as described in the Color Test Method described herein.
Color matching or comparisons of two or more elements comprising an externally visible surface, wherein each externally visible surface comprises a color, can be determined by color space volume, total color difference, and/or hue difference.
i. Color Space Volume
One embodiment of the present invention is color matching of two or more externally visible surfaces of differing elements such that the colors occupy a defined CIELab color space volume. In other words, the color space volume represents how matchable one or more colors are to one another. The match is defined by the boundary surface and depends on the position of the color in the color space. Characterizing color matching within a volume is desirable such that the volume accounts for and considers all three dimensions within CIELab. While not being limited to the theory, such a three-dimensional measurement is believed to more fully characterize the difference in two colors. The CIELab color space volume (V), for a first color (L*1, a1, b*1) and a second color (L*2, a*2, b*2), is calculated according to Formula 2 as follows:

V= 4/3·π·[(L*1−L*2)/2·(a*1−a*2)/2·(b*1−b*2)/2]  Formula 2

The CIELab color space volume results in a solid substantially ellipsoidal in shape; however, if ΔL* (essentially L*1−L*2), Δa* (essentially a*1−a*2), and Δb* (essentially b*1−b*2) are equal, the solid will be spherical. As used herein, a “solid” refers to the mathematical concept of a three-dimensional figure having length, breadth, and height (or depth). An ellipsoidal volume is preferred to calculate volume because an ellipsoid generally requires the dimensional differences of ΔL*, Δa*, and Δb* to be relatively more uniform than other solids. Furthermore, it is believed that ellipsoidal volumes are more visually acceptable (i.e., less detectable color mismatch by human perception) than spherical volumes.
In one example, the non-textual indicia is a color red described by an L*a*b* color of 51, 54, and 39.5 and a Color Space Volume (V) of less than about 50,000 and/or less than about 35,000 and/or less than about 20,000 and/or less than about 15,000 and/or less than about 10,000 and/or less than about 5,000.
In one example, the non-textual indicia is a color blue described by an L*a*b* color of 48.5, −7.5, and −46.7 and a Color Space Volume (V) of less than about 20,000 and/or less than about 15,000 and/or less than about 10,000 and/or less than about 5,000 and/or less than about 1,000.
In one example, the non-textual indicia is a color green described by an L*a*b* color of 77.9, −35.9, and 29.9 and a Color Space Volume (V) of less than about 10,000 and/or less than about 5,000 and/or less than about 2,500 and/or less than about 2,000 and/or less than about 1,500.
In one example, the non-textual indicia is a color orange described by an L*a*b* color of 67, 26, and 83.8 and a Color Space Volume (V) of less than about 10,000 and/or less than about 5,000 and/or less than about 2,500 and/or less than about 2,000 and/or less than about 1,500.
In one example, the non-textual indicia is a color purple described by an L*a*b* color of 35, 29.3, and −28.8 and a Color Space Volume (V) of less than about 10,000 and/or less than about 5,000 and/or less than about 2,500 and/or less than about 2,000 and/or less than about 1,500.
In one example of an array of sanitary tissue products, a first package comprises a color described by an L*a*b* color of 51, 54, and 39.5 and a Color Space Volume (V) of less than about 50,000 and a second package comprises a color described by an L*a*b* color of 48.5, −7.5, and −46.7 and a Color Space Volume (V) of less than about 20,000.
The non-textual indicia color is analyzed according to the Color Test Method described herein.
It should be recognized that the colors of more than two non-textual indicia may occupy the aforementioned CIELab color space volumes. In calculating the color space volume for more than two non-textual indicia colors, volume is calculated using the maximum and minimum L*, a*, and b* from a set of non-textual indicia colors. A given set of non-textual indicia colors will yield a set of L*, a*, and b* values. A maximum color value is selected by taking the maximum L*, the maximum a*, and the maximum b* from the set of L*, a*, and b* values. Likewise, a minimum color value is selected by taking the minimum L*, the minimum a*, and the minimum b* from the set of L*, a*, and b* values. The maximum color values and minimum color values are used to calculate V according to Formula 2 above. In one example, the colors of more than two non-textual indicia colors occupy the volume. In another example, the colors of more than three non-textual indicia colors occupy the volume.
ii. Color Space Total Difference
In one example of the present invention, two or more different non-textual indicia colors exhibit a color space total difference. The color space total difference represents the distance between two points within CIELab color space. The CIELab color space total difference (“ΔE”) between a first color (L*1, a1, b*1) and a second color (L*2, a*2, b*2), is calculated according to Formula 3 as follows:

ΔE=[(L*1−L*2)2·(a*1−a*2)2·(b*1−b*2)2]1/2  Formula 3

In one example, the color space total difference (“ΔE”) between a first non-textual indicia color and a second non-textual indicia color is greater than about 30 and/or greater than about 60 and/or greater than about 80 and/or greater than about 100.
Test Methods
Unless otherwise indicated, all tests described herein including those described under the Definitions section and the following test methods are conducted on samples, fibrous structure samples and/or sanitary tissue product samples and/or handsheets that have been conditioned in a conditioned room at a temperature of 73° F.±4° F. (about 23° C.±2.2° C.) and a relative humidity of 50%±10% for 2 hours prior to the test. Further, all tests are conducted in such conditioned room. Tested samples and felts should be subjected to 73° F.+4° F. (about 23° C.±2.2° C.) and a relative humidity of 50%±10% for 2 hours prior to testing.
Basis Weight Method:
Basis weight is measured by preparing one or more samples of a certain area (m2) and weighing the sample(s) of a fibrous structure according to the present invention and/or a sanitary toilet tissue product comprising such fibrous structure on a top loading balance with a minimum resolution of 0.01 g. The balance is protected from air drafts and other disturbances using a draft shield. Weights are recorded when the readings on the balance become constant. The average weight (g) is calculated and the average area of the samples (m2). The basis weight (g/m2) is calculated by dividing the average weight (g) by the average area of the samples (m2).
Dry Tensile Strength Test Method:
One (1) inch by five (5) inch (2.5 cm×12.7 cm) strips of fibrous structure and/or sanitary toilet tissue product are provided. The strip is placed on an electronic tensile tester Model 1122 commercially available from Instron Corp., Canton, Mass. in a conditioned room at a temperature of 73° F.±4° F. (about 28° C.±2.2° C.) and a relative humidity of 50%±10%. The crosshead speed of the tensile tester is 2.0 inches per minute (about 5.1 cm/minute) and the gauge length is 4.0 inches (about 10.2 cm). The Dry Tensile Strength can be measured in any direction by this method. The “Total Dry Tensile Strength” or “TDT” is the special case determined by the arithmetic total of MD and CD tensile strengths of the strips.
Wet Tensile Strength Test Method:
An electronic tensile tester (Thwing-Albert EJA Materials Tester, Thwing-Albert Instrument Co., 10960 Dutton Rd., Philadelphia, Pa., 19154) is used and operated at a crosshead speed of 4.0 inch (about 10.16 cm) per minute and a gauge length of 1.0 inch (about 2.54 cm), using a strip of a fibrous structure and/or sanitary tissue product of 1 inch wide and a length greater than 3 inches long. The two ends of the strip are placed in the upper jaws of the machine, and the center of the strip is placed around a stainless steel peg (0.5 cm in diameter). After verifying that the strip is bent evenly around the steel peg, the strip is soaked in distilled water at about 20° C. for a soak time of 5 seconds before initiating cross-head movement. The initial result of the test is an array of data in the form load (grams force) versus crosshead displacement (centimeters from starting point).
The sample is tested in two orientations, referred to here as MD (machine direction, i.e., in the same direction as the continuously wound reel and forming fabric) and CD (cross-machine direction, i.e., 900 from MD). The MD and CD wet tensile strengths are determined using the above equipment and the Total Wet Tensile is determined by taking the sum of these two values.
Softness Test Method:
Ideally, prior to softness testing, the samples to be tested should be conditioned according to Tappi Method #T4020M-88. Here, samples are preconditioned for 24 hours at a relative humidity level of 10 to 35% and within a temperature range of 22° C. to 40° C. After this preconditioning step, samples should be conditioned for 24 hours at a relative humidity of 48% to 52% and within a temperature range of 22° C. to 24° C. Ideally, the softness panel testing should take place within the confines of a constant temperature and humidity room. If this is not feasible, all samples, including the controls, should experience identical environmental exposure conditions.
Softness testing is performed as a paired comparison in a form similar to that described in “Manual on Sensory Testing Methods”, ASTM Special Technical Publication 434, published by the American Society For Testing and Materials 1968 and is incorporated herein by reference. Softness is evaluated by subjective testing using what is referred to as a Paired Difference Test. The method employs a standard external to the test material itself. For tactile perceived softness two samples are presented such that the subject cannot see the samples, and the subject is required to choose one of them on the basis of tactile softness. The result of the test is reported in what is referred to as Panel Score Unit (PSU). With respect to softness testing to obtain the softness data reported herein in PSU, a number of softness panel tests are performed. In each test ten practiced softness judges are asked to rate the relative softness of three sets of paired samples. The pairs of samples are judged one pair at a time by each judge: one sample of each pair being designated X and the other Y. Briefly, each X sample is graded against its paired Y sample as follows:
1. a grade of plus one is given if X is judged to may be a little softer than Y, and a grade of minus one is given if Y is judged to may be a little softer than X;
2. a grade of plus two is given if X is judged to surely be a little softer than Y, and a grade of minus two is given if Y is judged to surely be a little softer than X;
3. a grade of plus three is given to X if it is judged to be a lot softer than Y, and a grade of minus three is given if Y is judged to be a lot softer than X; and, lastly:
4. a grade of plus four is given to X if it is judged to be a whole lot softer than Y, and a grade of minus 4 is given if Y is judged to be a whole lot softer than X.
The grades are averaged and the resultant value is in units of PSU. The resulting data are considered the results of one panel test. If more than one sample pair is evaluated then all sample pairs are rank ordered according to their grades by paired statistical analysis. Then, the rank is shifted up or down in value as required to give a zero PSU value to which ever sample is chosen to be the zero-base standard. The other samples then have plus or minus values as determined by their relative grades with respect to the zero base standard. The number of panel tests performed and averaged is such that about 0.2 PSU represents a significant difference in subjectively perceived softness.
Lint Value Test Method:
The amount of lint generated from a finished fibrous structure is determined with a Sutherland Rub Tester. This tester uses a motor to rub a weighted felt 5 times over the finished fibrous structure, while the finished fibrous structure is restrained in a stationary position. This finished fibrous structure can be is referred to throughout this method as the “web”. The Hunter Color L value is measured before and after the rub test. The difference between these two Hunter Color L values is then used to calculate a lint value. This lint method is designed to be used with white or substantially white fibrous structures and/or sanitary toilet tissue products. Therefore, if testing of a non-white tissue, such as blue-colored or peach-colored tissue is desired, the same formulation should be used to make a sample without the colored dye, pigment, etc, using bleached kraft pulps.
i. Sample Preparation
Prior to the lint rub testing, the samples to be tested should be conditioned according to Tappi Method #T4020M-88. Here, samples are preconditioned for 24 hours at a relative humidity level of 10 to 35% and within a temperature range of 22° C. to 40° C. After this preconditioning step, samples should be conditioned for 24 hours at a relative humidity of 48 to 52% and within a temperature range of 22° C. to 24° C. This rub testing should also take place within the confines of the constant temperature and humidity room.
The Sutherland Rub Tester may be obtained from Testing Machines, Inc. (Amityville, N.Y., 1701). The web is first prepared by removing and discarding any product which might have been abraded in handling, e.g. on the outside of the roll. For products formed from multiple plies of webs, this test can be used to make a lint measurement on the multi-ply product, or, if the plies can be separated without damaging the specimen, a measurement can be taken on the individual plies making up the product. If a given sample differs from surface to surface, it is necessary to test both surfaces and average the values in order to arrive at a composite lint value. In some cases, products are made from multiple-plies of webs such that the facing-out surfaces are identical, in which case it is only necessary to test one surface. If both surfaces are to be tested, it is necessary to obtain six specimens for testing (Single surface testing only requires three specimens). Each specimen should be folded in half such that the crease is running along the cross direction (CD) of the web sample. For two-surface testing, make up 3 samples with a first surface “out” and 3 with the second-side surface “out”. Keep track of which samples are first surface “out” and which are second surface out.
Obtain a 30′′×40′′ piece of Crescent #300 cardboard from Cordage Inc. (800 E. Ross Road, Cincinnati, Ohio, 45217). Using a paper cutter, cut out six pieces of cardboard of dimensions of 2.5′′ 6′′. Puncture two holes into each of the six cards by forcing the cardboard onto the hold down pins of the Sutherland Rub tester.
Center and carefully place each of the 2.5×6′′ cardboard pieces on top of the six previously folded samples. Make sure the 6′′ dimension of the cardboard is running parallel to the machine direction (MD) of each of the tissue samples. Center and carefully place each of the cardboard pieces on top of the three previously folded samples. Once again, make sure the 6′′ dimension of the cardboard is running parallel to the machine direction (MD) of each of the web samples.
Fold one edge of the exposed portion of the web specimen onto the back of the cardboard. Secure this edge to the cardboard with adhesive tape obtained from 3M Inc. (3⁄4′′ wide Scotch Brand, St. Paul, Minn.). Carefully grasp the other over-hanging tissue edge and snugly fold it over onto the back of the cardboard. While maintaining a snug fit of the web specimen onto the board, tape this second edge to the back of the cardboard. Repeat this procedure for each sample.
Turn over each sample and tape the cross direction edge of the web specimen to the cardboard. One half of the adhesive tape should contact the web specimen while the other half is adhering to the cardboard. Repeat this procedure for each of the samples. If the tissue sample breaks, tears, or becomes frayed at any time during the course of this sample preparation procedure, discard and make up a new sample with a new tissue sample strip.
There will now be 3 first-side surface “out” samples on cardboard and (optionally) 3 second-side surface “out” samples on cardboard.
ii. Felt Preparation
Obtain a 30′′×40′′ piece of Crescent #300 cardboard from Cordage Inc. (800 E. Ross Road, Cincinnati, Ohio, 45217). Using a paper cutter, cut out six pieces of cardboard of dimensions of 2.25′′×7.25′′. Draw two lines parallel to the short dimension and down 1.125′′ from the top and bottom most edges on the white side of the cardboard. Carefully score the length of the line with a razor blade using a straight edge as a guide. Score it to a depth about half way through the thickness of the sheet. This scoring allows the cardboard/felt combination to fit tightly around the weight of the Sutherland Rub tester. Draw an arrow running parallel to the long dimension of the cardboard on this scored side of the cardboard.
Cut the six pieces of black felt (F-55 or equivalent from New England Gasket, 550 Broad Street, Bristol, Conn. 06010) to the dimensions of 2.25′′×8.5′′×0.0625′′. Place the felt on top of the unscored, green side of the cardboard such that the long edges of both the felt and cardboard are parallel and in alignment. Make sure the fluffy side of the felt is facing up. Also allow about 0.5′′ to overhang the top and bottom most edges of the cardboard. Snugly fold over both overhanging felt edges onto the backside of the cardboard with Scotch brand tape. Prepare a total of six of these felt/cardboard combinations.
For best reproducibility, all samples should be run with the same lot of felt. Obviously, there are occasions where a single lot of felt becomes completely depleted. In those cases where a new lot of felt must be obtained, a correction factor should be determined for the new lot of felt. To determine the correction factor, obtain a representative single web sample of interest, and enough felt to make up 24 cardboard/felt samples for the new and old lots.
As described below and before any rubbing has taken place, obtain Hunter L readings for each of the 24 cardboard/felt samples of the new and old lots of felt. Calculate the averages for both the 24 cardboard/felt samples of the old lot and the 24 cardboard/felt samples of the new lot. Next, rub test the 24 cardboard/felt boards of the new lot and the 24 cardboard/felt boards of the old lot as described below. Make sure the same web lot number is used for each of the 24 samples for the old and new lots. In addition, sampling of the web in the preparation of the cardboard/tissue samples must be done so the new lot of felt and the old lot of felt are exposed to as representative as possible of a tissue sample. Discard any product which might have been damaged or abraded. Next, obtain 48 web samples for the calibration. Place the first sample on the far left of the lab bench and the last of the 48 samples on the far right of the bench. Mark the sample to the far left with the number “1” in a 1 cm by 1 cm area of the corner of the sample. Continue to mark the samples consecutively up to 48 such that the last sample to the far right is numbered 48.
Use the 24 odd numbered samples for the new felt and the 24 even numbered samples for the old felt. Order the odd number samples from lowest to highest. Order the even numbered samples from lowest to highest. Now, mark the lowest number for each set with a letter “F” (for “first-side”). Mark the next highest number with the letter “S” (for second-side). Continue marking the samples in this alternating “F”/“S” pattern. Use the “F” samples for first surface “out” lint analyses and the “S” samples for second-side surface “out” lint analyses. There are now a total of 24 samples for the new lot of felt and the old lot of felt. Of this 24, twelve are for first-side surface “out” lint analysis and 12 are for second-side surface “out” lint analysis.
Rub and measure the Hunter Color L values for all 24 samples of the old felt as described below. Record the 12 first-side surface Hunter Color L values for the old felt. Average the 12 values. Record the 12 second-side surface Hunter Color L values for the old felt. Average the 12 values. Subtract the average initial un-rubbed Hunter Color L felt reading from the average Hunter Color L reading for the first-side surface rubbed samples. This is the delta average difference for the first-side surface samples. Subtract the average initial un-rubbed Hunter Color L felt reading from the average Hunter Color L reading for the second-side surface rubbed samples. This is the delta average difference for the second-side surface samples. Calculate the sum of the delta average difference for the first-side surface and the delta average difference for the second-side surface and divide this sum by 2. This is the uncorrected lint value for the old felt. If there is a current felt correction factor for the old felt, add it to the uncorrected lint value for the old felt. This value is the corrected Lint Value for the old felt.
Rub and measure the Hunter Color L values for all 24 samples of the new felt as described below. Record the 12 first-side surface Hunter Color L values for the new felt. Average the 12 values. Record the 12 second-side surface Hunter Color L values for the new felt. Average the 12 values. Subtract the average initial un-rubbed Hunter Color L felt reading from the average Hunter Color L reading for the first-side surface rubbed samples. This is the delta average difference for the first-side surface samples. Subtract the average initial un-rubbed Hunter Color L felt reading from the average Hunter Color L reading for the second-side surface rubbed samples. This is the delta average difference for the second-side surface samples. Calculate the sum of the delta average difference for the first side surface and the delta average difference for the second-side surface and divide this sum by 2. This is the uncorrected lint value for the new felt.
Take the difference between the corrected Lint Value from the old felt and the uncorrected lint value for the new felt. This difference is the felt correction factor for the new lot of felt. Adding this felt correction factor to the uncorrected lint value for the new felt should be identical to the corrected Lint Value for the old felt. Note that the above procedure implies that the calibration is done with a two-surfaced specimen. If it desirable or necessary to do a felt calibration using a single-surfaced sample, it is satisfactory; however, the total of 24 tests should still be done for each felt.
iii. Care of 4 Pound Weight
The four pound weight has four square inches of effective contact area providing a contact pressure of one pound per square inch. Since the contact pressure can be changed by alteration of the rubber pads mounted on the face of the weight, it is important to use only the rubber pads supplied by the manufacturer (Brown Inc., Mechanical Services Department, Kalamazoo, Mich.). These pads must be replaced if they become hard, abraded or chipped off. When not in use, the weight must be positioned such that the pads are not supporting the full weight of the weight. It is best to store the weight on its side.
iv. Rub Tester Instrument Calibration
The Sutherland Rub Tester must first be calibrated prior to use. First, turn on the Sutherland Rub Tester by moving the tester switch to the “cont” position. When the tester arm is in its position closest to the user, turn the tester's switch to the “auto” position. Set the tester to run 5 strokes by moving the pointer arm on the large dial to the “five” position setting. One stroke is a single and complete forward and reverse motion of the weight. The end of the rubbing block should be in the position closest to the operator at the beginning and at the end of each test. Prepare a test specimen on cardboard sample as described above. In addition, prepare a felt on cardboard sample as described above. Both of these samples will be used for calibration of the instrument and will not be used in the acquisition of data for the actual samples.
Place this calibration web sample on the base plate of the tester by slipping the holes in the board over the hold-down pins. The hold-down pins prevent the sample from moving during the test. Clip the calibration felt/cardboard sample onto the four pound weight with the cardboard side contacting the pads of the weight. Make sure the cardboard/felt combination is resting flat against the weight. Hook this weight onto the tester arm and gently place the tissue sample underneath the weight/felt combination. The end of the weight closest to the operator must be over the cardboard of the web sample and not the web sample itself. The felt must rest flat on the tissue sample and must be in 100% contact with the web surface. Activate the tester by depressing the “push” button.
Keep a count of the number of strokes and observe and make a mental note of the starting and stopping position of the felt covered weight in relationship to the sample. If the total number of strokes is five and if the end of the felt covered weight closest to the operator is over the cardboard of the web sample at the beginning and end of this test, the tester is calibrated and ready to use. If the total number of strokes is not five or if the end of the felt covered weight closest to the operator is over the actual web sample either at the beginning or end of the test, repeat this calibration procedure until 5 strokes are counted the end of the felt covered weight closest to the operator is situated over the cardboard at the both the start and end of the test. During the actual testing of samples, monitor and observe the stroke count and the starting and stopping point of the felt covered weight. Recalibrate when necessary.
v. Hunter Color Meter Calibration
Adjust the Hunter Color Difference Meter for the black and white standard plates according to the procedures outlined in the operation manual of the instrument. Also run the stability check for standardization as well as the daily color stability check if this has not been done during the past eight hours. In addition, the zero reflectance must be checked and readjusted if necessary. Place the white standard plate on the sample stage under the instrument port. Release the sample stage and allow the sample plate to be raised beneath the sample port. Using the “L-Y”, “a-X”, and “b-Z” standardizing knobs, adjust the instrument to read the Standard White Plate Values of “L”, “a”, and “b” when the “L”, “a”, and “b” push buttons are depressed in turn.
vi. Measurement of Samples
The first step in the measurement of lint is to measure the Hunter color values of the black felt/cardboard samples prior to being rubbed on the web sample. The first step in this measurement is to lower the standard white plate from under the instrument port of the Hunter color instrument. Center a felt covered cardboard, with the arrow pointing to the back of the color meter, on top of the standard plate. Release the sample stage, allowing the felt covered cardboard to be raised under the sample port.
Since the felt width is only slightly larger than the viewing area diameter, make sure the felt completely covers the viewing area. After confirming complete coverage, depress the L push button and wait for the reading to stabilize. Read and record this L value to the nearest 0.1 unit. If a D25D2A head is in use, lower the felt covered cardboard and plate, rotate the felt covered cardboard 90° so the arrow points to the right side of the meter. Next, release the sample stage and check once more to make sure the viewing area is completely covered with felt. Depress the L push button. Read and record this value to the nearest 0.1 unit. For the D25D2M unit, the recorded value is the Hunter Color L value. For the D25D2A head where a rotated sample reading is also recorded, the Hunter Color L value is the average of the two recorded values.
Measure the Hunter Color L values for all of the felt covered cardboards using this technique. If the Hunter Color L values are all within 0.3 units of one another, take the average to obtain the initial L reading. If the Hunter Color L values are not within the 0.3 units, discard those felt/cardboard combinations outside the limit. Prepare new samples and repeat the Hunter Color L measurement until all samples are within 0.3 units of one another.
For the measurement of the actual web sample/cardboard combinations, place the web sample/cardboard combination on the base plate of the tester by slipping the holes in the board over the hold-down pins. The hold-down pins prevent the sample from moving during the test. Clip the calibration felt/cardboard sample onto the four pound weight with the cardboard side contacting the pads of the weight. Make sure the cardboard/felt combination is resting flat against the weight Hook this weight onto the tester arm and gently place the web sample underneath the weight/felt combination. The end of the weight closest to the operator must be over the cardboard of the web sample and not the web sample itself. The felt must rest flat on the web sample and must be in 100% contact with the web surface.
Next, activate the tester by depressing the “push” button. At the end of the five strokes the tester will automatically stop. Note the stopping position of the felt covered weight in relation to the sample. If the end of the felt covered weight toward the operator is over cardboard, the tester is operating properly. If the end of the felt covered weight toward the operator is over sample, disregard this measurement and recalibrate as directed above in the Sutherland Rub Tester Calibration section.
Remove the weight with the felt covered cardboard. Inspect the web sample. If torn, discard the felt and web sample and start over. If the web sample is intact, remove the felt covered cardboard from the weight. Determine the Hunter Color L value on the felt covered cardboard as described above for the blank felts. Record the Hunter Color L readings for the felt after rubbing. Rub, measure, and record the Hunter Color L values for all remaining samples. After all web specimens have been measured, remove and discard all felt. Felts strips are not used again. Cardboards are used until they are bent, torn, limp, or no longer have a smooth surface.
vii. Calculations
Determine the delta L values by subtracting the average initial L reading found for the unused felts from each of the measured values for the first-side surface and second-side surface sides of the sample as follows.
For samples measured on both surfaces, subtract the average initial L reading found for the unused felts from each of the three first-side surface L readings and each of the three second-side surface L readings. Calculate the average delta for the three first-side surface values. Calculate the average delta for the three second-side surface values. Subtract the felt factor from each of these averages. The final results are termed a lint for the first-side surface and a lint for the second-side surface of the web.
By taking the average of the lint value on the first-side surface and the second-side surface, the lint is obtained which is applicable to that particular web or product. In other words, to calculate lint value Formula 4 below is used:




  
    
      
        
          Lint
          ⁢
          
            
          
          ⁢
          Value
        
        =
        
          
            
              
                
                  
                    Lint
                    ⁢
                    
                      
                    
                    ⁢
                    Value
                  
                  ,
                  
                    
                      first
                      ⁢
                      
                        -
                      
                      ⁢
                      side
                    
                    +
                  
                
              
            
            
              
                
                  
                    Lint
                    ⁢
                    
                      
                    
                    ⁢
                    Value
                  
                  ,
                  
                    second
                    ⁢
                    
                      -
                    
                    ⁢
                    side
                  
                
              
            
          
          2
        
      
    
    
      
        Formula
        ⁢
        
          
        
        ⁢
        4
      
    
  




For samples measured only for one surface, subtract the average initial L reading found for the unused felts from each of the three L readings. Calculate the average delta for the three surface values. Subtract the felt factor from this average. The final result is the lint value for that particular web or product.

Color Test Method:

Color-containing surfaces are tested in a dry state and at an ambient humidity of approximately 500%.+−0.2%. Reflectance color is measured using the Hunter Lab LabScan XE reflectance spectrophotometer obtained from Hunter Associates Laboratory of Reston, Va. The spectrophotometer is set to the CIELab color scale and with a D50 illumination. The Observer is set at 10° and the Mode is set at 45/0°. Area View is set to 0.125′′ and Port Size is set to 0.20′′ for films; Area View is set to 1.00′′ and Port Size is set to 1.20′′ other materials. The spectrophotometer is calibrated prior to sample analysis utilizing the black and white reference tiles supplied from the vendor with the instrument. Calibration is done according to the manufacturer's instructions as set forth in LabScan XE User's Manual, Manual Version 1.1, August 2001, A60-1010-862.
If cleaning is required of the reference tiles or samples, only tissues that do not contain embossing, lotion, or brighteners should be used (e.g., Puffs® tissue). Any sample point on the externally visible surface of the element containing the imparted color to be analyzed should be selected. Sample points are selected so as to be close in perceived color. A single ply of the element is placed over the spectrophotometer's sample port. A single ply, as used within the test method, means that the externally visible surface of the element is not folded. Thus, a single ply of an externally visible surface may include the sampling of a laminate, which itself is comprised of more than one lamina. The sample point comprising the color to be analyzed must be larger than the sample port to ensure accurate measurements. A white tile, as supplied by the manufacturer, is placed behind the externally visible surface. The L*, a*, and b* values are read and recorded. The externally visible surface is removed and repositioned so that a minimum of six readings are obtained for the externally visible surface. If possible (e.g., the size of the imparted color on the element in question does not limit the ability to have six discretely different, non-overlapping sample points), each of the readings is to be performed at a substantially different region on the externally visible surface so that no two sample points overlap. If the size of the imparted color region requires overlapping of sample points, only six samples should be taken with the sample points selected to minimize overlap between any two sample points. The readings are averaged to yield the reported L*, a*, and b* values for a specified color on an externally visible surface of an element.
In calculating the color space volume, V, maximum and minimum L*, a*, and b* values are determined for a particular set of elements to be color matched. The maximum and minimum L*, a*, and b* values are used to calculate V according to Formula 2 presented above.
Absorbency Test Method (Horizontal Full Sheet (HFS)):
The Horizontal Full Sheet (HFS) test method determines the amount of distilled water absorbed and retained by a sanitary toilet tissue product of the present invention. This method is performed by first weighing a sample of the sanitary toilet tissue product to be tested (referred to herein as the “Dry Weight of the paper”), then thoroughly wetting the sanitary toilet tissue product, draining the wetted sanitary toilet tissue product in a horizontal position and then reweighing (referred to herein as “Wet Weight of the paper”). The absorptive capacity of the sanitary toilet tissue product is then computed as the amount of water retained in units of grams of water absorbed by the sanitary toilet tissue product. When evaluating different sanitary toilet tissue product samples, the same size of sanitary toilet tissue product is used for all samples tested.
The apparatus for determining the HFS capacity of sanitary toilet tissue product comprises the following: an electronic balance with a sensitivity of at least +0.01 grams and a minimum capacity of 1200 grams. The balance should be positioned on a balance table and slab to minimize the vibration effects of floor/benchtop weighing. The balance should also have a special balance pan to be able to handle the size of the sanitary toilet tissue product tested (i.e.; a paper sample of about 11 in. (27.9 cm) by 11 in. (27.9 cm)). The balance pan can be made out of a variety of materials. Plexiglass is a common material used.
A sample support rack and sample support cover is also required. Both the rack and cover are comprised of a lightweight metal frame, strung with 0.012 in. (0.305 cm) diameter monofilament so as to form a grid of 0.5 inch squares (1.27 cm2). The size of the support rack and cover is such that the sample size can be conveniently placed between the two.
The HFS test is performed in an environment maintained at 23±1° C. and 50±2% relative humidity. A water reservoir or tub is filled with distilled water at 23±1° C. to a depth of 3 inches (7.6 cm).
The sanitary toilet tissue product to be tested is carefully weighed on the balance to the nearest 0.01 grams. The dry weight of the sample is reported to the nearest 0.01 grams. The empty sample support rack is placed on the balance with the special balance pan described above. The balance is then zeroed (tared). The sample is carefully placed on the sample support rack. The support rack cover is placed on top of the support rack. The sample (now sandwiched between the rack and cover) is submerged in the water reservoir. After the sample has been submerged for 60 seconds, the sample support rack and cover are gently raised out of the reservoir.
The sample, support rack and cover are allowed to drain horizontally for 120±5 seconds, taking care not to excessively shake or vibrate the sample. Next, the rack cover is carefully removed and the wet sample and the support rack are weighed on the previously tared balance. The weight is recorded to the nearest 0.01 g. This is the wet weight of the sample.
The gram per sanitary toilet tissue product sample absorptive capacity of the sample is defined as (Wet Weight of the paper−Dry Weight of the paper).
Dust Value Test Method:
Dust value is measured using a particle counter commercially available (Sympatec QICPIC, Sympatec GmbH, Am Pulverhaus 1, 38678 Clausthal-Zellerfeld, Germany). The instrument is used according to the manufacturer's recommendation and a frame rate of 400 frames/sec is selected. The particle size range is set to 20 to 10,000 micrometers. Sympatec's standard chute for guiding particles into the instrument was modified by removing the flights within the chute and by attaching a funnel to the top of the chute. The funnel is constructed of stainless steel and has 4 trapezoidal sides, 14 inches across the wide part (top), tapering to 2 inches wide at the bottom, i.e. point of attachment with the chute. The trapezoid sides are 12 inches long. A vacuum is attached to the exit of the instrument to create an airflow through the instrument, and consequently the chute and the funnel. The vacuum is sufficient to create an airspeed entering the funnel of 470 feet/min. The airspeed is measured using an Extech Instruments ThermoAnemometer Model 407113 and Anemometer metal probe, SN Q138487. The probe was mounted in a plastic tube in a square of foam (necessitated by the square shape of the funnel). The probe assembly was placed in the funnel so that the foam sealed against the funnel walls and the anemometer was centered above the shaft opening. The linear flow was calculated for the bottom of the funnel where the drop shaft begins (the 2′′×2′′ opening).
To perform this Dust Test, a sanitary tissue product is dispensed, i.e. pulled apart at its perforations, manually at the top of the funnel to release dust. The force to rupture the product at the perforations is a function of the dispensing tensile and the operator merely applies enough force directly in tension across the perforations to dispense the product in a manner typical of tissue dispensing. Care should be taken not to tear the product across the perforations, rather it should be dispensed by pulling directly in tension across the perforations. The dust fibers and/or particles so liberated are directed into the modified Sympatec chute and the chute delivers them to the measurement zone of the instrument by gravity and vacuum.
The QICPIC measures the number of particles passing through the measurement zone using dynamic image analysis. Five perforations are separated per measurement and the Raw Dispensing Dust value is simply the total number of particles counted.
The raw data needs to be normalized for width of the product at the perforations. The Raw Dispensing Dust value is multiplied by the width of the product at the perforations in inches and divided by 4.5. This result is the Dispensing Dust value. Products more than about 6′′ wide should be precut in width with scissors to 4.5 inches wide prior to testing to prevent being too wide to dispense properly in tension.
The Normalized Dispensing Dust value is determined by any one of the following relationships: 1) Dispensing Dust value divided by Dispensing Tensile and multiplied by 150 yields the Tensile Normalized Dispensing Dust value; 2) Dispensing Dust Value divided by Lint test result and multiplied by 7 yields the Lint Normalized Dispensing Dust value; and 3) Dispensing Dust value divided by the product Density and multiplied by 0.08 yields the Density Normalized Dispensing Dust value.
The percent difference in Normalized Dispensing Dust Values between two different sanitary tissue product samples can be calculated.
The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”
All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. To the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

## Claims

1. An array of sanitary tissue products comprising a first sanitary tissue product and a second sanitary tissue product wherein the first sanitary tissue product is housed within a first package and the second sanitary tissue product is housed within a second package, wherein the first sanitary tissue product exhibits a value of total dry tensile strength that is different from the second sanitary tissue product and wherein the first package comprises a dominant strength indicia and wherein the first package and the second package are separate from each other such that the first and second packages are displayed on a store shelf separate from each other as individual packages in a way that the first and second packages are visible to a consumer during the consumer's purchasing decision process and that are designed to be sold individually and wherein the first and second packages each comprise a common brand name.

2. The array of sanitary tissue products according to claim 1 wherein the value of total dry tensile strength exhibited by the first sanitary tissue product is at least 20% greater than the value of total dry tensile strength exhibited by the second sanitary tissue product.

3. The array of sanitary tissue products according to claim 1 wherein the value of total dry tensile strength exhibited by the first sanitary tissue product is 550 g/in or greater and the value of total dry tensile strength of the second sanitary tissue product is less than 550 Win.

4. The array of sanitary tissue products according to claim 2 wherein the value of total dry tensile strength exhibited by the first sanitary tissue product is from about 600 to about 950 g/in and the value of total dry tensile strength of the second sanitary tissue product is from about 350 to about 550 Win.

5. The array of sanitary tissue products according to claim 1 wherein the first sanitary tissue product within the array exhibits a texture that is different from the second sanitary tissue product's texture.

6. The array of sanitary tissue products according to claim 1 wherein the first sanitary tissue product exhibits a surface pattern that is different from the second sanitary tissue product's surface pattern.

7. The array of sanitary tissue products according to claim 1 wherein at least one of the sanitary tissue products within the array comprises more than one ply.

8. The array of sanitary tissue products according to claim 7 wherein two or more of the sanitary tissue products within the array comprise more than one ply.

9. The array of sanitary tissue products according to claim 1 wherein the dominant strength indicia is selected from the group consisting of: texture, text, picture, character representation exhibiting an action pose, color and mixtures thereof.

10. The array of sanitary tissue products according to claim 1 wherein the first sanitary tissue product exhibits a lint value of greater than 2.5.

11. The array of sanitary tissue products according to claim 1 wherein the second sanitary tissue product exhibits a lint value of less than about 9.0.

12. The array of sanitary tissue products according to claim 1 wherein the first sanitary tissue product exhibits a dust value that is less than about 75% of the dust value of the second sanitary tissue product.

13. The array of sanitary tissue products according to claim 1 wherein the second sanitary tissue product exhibits a value of a common intensive property other than total dry tensile strength that is different from the value of the common intensive property for the first sanitary tissue product.

14. The array of sanitary tissue products according to claim 13 wherein the common intensive property is selected from the group consisting of:
softness, lint, absorbency, thickness, basis weight, density, scent and mixtures thereof.

15. The array of sanitary tissue products according to claim 13 wherein the common intensive property is softness.

16. The array of sanitary tissue products according to claim 1 wherein the array further comprises a third sanitary tissue product that exhibits at least one value of an intensive property that is different from at least one of the first and second sanitary tissue products.

17. The array of sanitary tissue products according to claim 16 wherein the third sanitary tissue product comprises a lotion composition.

18. The array of sanitary tissue products according to claim 1 wherein the sanitary tissue products are toilet tissue products.