Abstract:
Improved peel-to-open packages including sachets, pouches, and the like are disclosed. The packages are made of substrate layers removably adhered together using an adhesive pattern of seal(s) that are characterized by peel forces. The adhesive pattern is designed to provide for controlled opening of the packages, in some embodiments to a predetermined stopping point, such that any product(s) contained therein are presented to the consumer for removal. Further design features include, but are not limited to, offset tabs, textures, color variations and text, which may further provide for easy, intuitive opening.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of U.S. Provisional Application No. 60/843,179, filed Sep. 8, 2006. 
     
     FIELD OF THE INVENTION 
       [0002]    Peel-to-open packages including, but not limited to, sachets, pouches, and the like. 
       BACKGROUND OF THE INVENTION 
       [0003]    Difficult to open packages can be of concern to consumers, particularly those with limited manual dexterity and/or eyesight. Although a product may be excellent, if it is in a package that is hard to open, a consumer may settle for another product that is in an easier to open package. 
         [0004]    Products, especially those that are small and/or intended for a single use, are traditionally packaged in sachets and the like. Sachets generally comprise two layers that are releasably held together with a seal or seals to form an interior cavity. The interior cavity may contain products such as towelettes, creams, medicaments, adhesive strips, ointments, and the like. 
         [0005]    The layers of a sachet may be peeled apart in order to access the product within. This is typically accomplished by gripping a sachet at one end by each of its layers and exerting a pulling force. As the peel force(s) of the sachet&#39;s seal(s) are overcome by the pulling force, the sachet&#39;s layers are separated, and the product is ideally exposed to the consumer for removal. 
         [0006]    Sachets that are currently used for packaging products typically have a seal or seals with constant peel forces located along the longitudinal side edges of the sachet. If a constant pulling force is exerted to peel apart the layers of this type of sachet, momentum may be gained such that the rate of peeling increases as the sachet progressively opens. A momentum gain can have several negative consequences. For example, when the other end of the sachet is reached, the layers may unintentionally be peeled completely apart. As a result, the product may simply fall out of the sachet. If the pulling force is great enough, the product may be ejected some distance from the sachet. In either case, the consumer is relegated to searching for, finding and picking up the product before it may be used. This can be particularly difficult in an environment with low lighting, high moisture and/or if the product has landed in a hard to reach area such as a sink drain. The difficulty may be compounded by a consumer&#39;s limited vision and/or manual dexterity. 
         [0007]    There remains a need for packages including sachets and the like that may be peeled open in a controlled fashion to expose the product within for removal by the consumer. There remains a need for such packages to have an easily identifiable means of opening. There remains a need for such packages to have grip tabs that provide a means of peeling the packages open in moist environments such as bathrooms. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention provides improvements in the packaging of products, particularly small ones, including, but not limited to, oral care substances such as denture adhesives. The present packages include peel-to-open sachets, pouches, and the like and are hereinafter collectively referred to as “packages”. 
         [0009]    The present packages are made of a first layer and a second layer removably attached together using an adhesive pattern of seal(s) that are characterized by peel forces. The adhesive pattern is designed to provide for controlled opening of the packages. In some embodiments, the adhesive pattern provides for controlled opening of the packages to a predetermined stopping point, such that at least a portion of any product(s) optionally contained therein are presented to the consumer for removal. Further design features include, but are not limited to, offset tabs, textures, color variations, text or combinations thereof, which may further provide for easy, intuitive opening. 
         [0010]    In one embodiment, the invention is directed to a package comprising a first layer and a second layer that are disposed in a face to face relationship such that a cavity is defined between the layers. The package is shaped such that it has a first end and a second end distal therefrom, with first and second opposing longitudinal side edges extending between the first and second ends. The two layers of the package are connected at the second end of the package, and are removably attached by an adhesive pattern comprising: a first seal disposed proximate to the first end of the package; a second seal disposed proximate to the first opposing longitudinal side edge; and a third seal disposed proximate to the second opposing longitudinal side edge. Each seal is characterized by a peel force. At least one of the second and third seals has a variable peel force, meaning that the peel force increases between the first and second ends of the package. 
         [0011]    In some embodiments, the packages further comprise grip tabs, which are located at the first end of the package. The grip tabs may be present in a variety of configurations. For example, the grip tabs may be provided in a variety of shapes, textures, colors, degrees of transparency and spatial orientations relative to each another. 
         [0012]    In some embodiments, the packages may contain oral care substances including, but not limited to denture adhesives. 
         [0013]    In further embodiments, the invention is directed to a secondary package comprising a plurality of primary packages such as those described above. The primary packages may contain oral care substances, including but not limited to, denture adhesive. 
         [0014]    These and other embodiments, aspects and advantages are encompassed within the present invention, and will become better understood with regard to the following description, figures and appended claims. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The accompanying figures show non-limiting embodiments of improved packages incorporating various aspects of the present invention. 
           [0016]      FIGS. 1-5  are plan views of packages according to the present invention. 
           [0017]      FIG. 6  is a side view of an embodiment in which the package comprises two layers formed from two separate pieces of substrate that are connected by a fifth seal. 
           [0018]      FIG. 7  is a side view of an embodiment in which the package is a single piece of substrate folded onto itself. 
           [0019]      FIG. 8  is a plan view of an embodiment in which the package comprises overlapping first and second layers. 
           [0020]      FIG. 9  is a plan view of an embodiment in which the package comprises first and second layers that do not overlap. 
           [0021]      FIGS. 10-11 , and  12 A are plan views of embodiments in which the packages comprise different adhesive patterns. 
           [0022]      FIG. 12B  shows the angular relation between two discrete seals. 
           [0023]      FIGS. 13-20  are plan and side views showing how the packages of the present invention may be peeled open. 
           [0024]      FIGS. 21-23  are plan views of embodiments in which the packages comprise grip tabs. 
           [0025]      FIG. 24  is a plan view of one embodiment in which adhesive strips are adhered to a plastic tray located in the cavity of the package. 
           [0026]      FIGS. 25-28  show embodiments of secondary packages of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0027]    “Opposing” as used herein means being across from each other in a given plane. 
         [0028]    “Longitudinal” as used herein means running lengthwise. 
         [0029]    “Extending” as used herein means spanning an interval of distance. 
         [0030]    “Removably attached” as used herein means held together but separable by applying a force. 
         [0031]    “Cavity” as used herein means a space suitable for containing product(s) therein. 
         [0032]    “Seal” as used herein means something that acts as a fastener, and may provide a tight closure, such as between a first and a second layer. 
         [0033]    “Peel force” as used herein means the amount of force required to cause at least a portion of an adhesive seal to fail, such that the portions of the first and second layers that had been fastened together by the seal separate. Peel force is measured as described in the Methods section infra. 
         [0034]    “Adjoining seals” as used herein is meant to encompass one seal with variable peel strengths, or a series of seals that appear connected to the naked eye with 20/20 vision when viewed at a distance of 12 inches, or 30.48 centimeters, under the unimpeded light of an ordinary incandescent 60 watt light bulb that is inserted in a fixture such as a table lamp. 
         [0035]    “Discrete seals” as used herein is meant to encompass seals that do not appear connected to the naked eye with 20/20 vision when viewed under the aforementioned conditions. 
         [0036]    “Intersecting” as used herein means divided into two parts, which may be equal or unequal. 
         [0037]    “Substrate” as used herein means any material, or group of materials that are used to form a layer of a package. 
         [0038]    “Opaque” as used herein means not clear, i.e., not transmitting or reflecting light. 
         [0039]    “Transparent” as used herein means clear, i.e., transmitting light. 
         [0040]    “Translucent” as used herein means allowing light to pass through diffusely. 
         [0041]    “Comprising” as used herein means that the various components, ingredients or steps may be conjointly employed in practicing the present invention. Accordingly, the term “comprising” is open-ended and encompasses the more restrictive terms “consisting essentially of” and “consisting of”. 
         [0042]    All numerical ranges disclosed herein, are meant to encompass each individual number within the range and to encompass any combination of the disclosed upper and lower limits of the ranges. 
         [0043]    Referring to  FIGS. 1-5 , various embodiments of the packages  1000  of the present invention are shown. Each package  1000  comprises a first layer  10  and a second layer  20  that are disposed in a face to face relationship. A cavity  30  is defined between the first and second layers  10 ,  20  such that a product or products  600  (shown in phantom) may optionally be contained therein. Each package  1000  is shaped such that it has a first end  100  and a second end  200  distal therefrom, with first and second opposing longitudinal side edges  300 A,  300 B extending between the first and second ends. The two layers  10 ,  20  of each package  1000  are connected in a face to face relationship at the second end  200  of the package and are removably attached by an adhesive pattern comprising: a first seal  510  disposed proximate to the first end of the package  1000 ; a second seal  520  disposed proximate to the first opposing longitudinal side edge  300 A of the package; and a third seal  530  disposed proximate to the second opposing longitudinal side edge  300 B of the package (each seal is shown in phantom). Each seal is characterized by a peel force. The peel force of at least one of the second and third seals  520 ,  530  is variable, meaning that the peel force increases between the first end  100  and second end  200  of each package  1000 . 
         [0044]    Referring now to  FIGS. 6 and 7 , the packages  1000  of the present invention comprise a first layer  10  and a second layer  20 . The layers of the packages may be formed and connected in any appropriate way as determined by one of skill in the art. For example, in one embodiment two separate pieces of substrate form the first and second layers  10 ,  20  which are connected together at the second end  200  of the package  1000  using what is termed herein as the “fifth seal”  550 , as shown for example from a side view in  FIG. 6 . The two separate pieces of substrate may be identical or different in composition. In another embodiment, a single piece of substrate is folded onto itself forming the first and second layers  10 ,  20  which are connected together at the second end  200  of the package  1000  by virtue of the resulting fold  560 , as shown for example from a side view in  FIG. 7 . 
         [0045]    Any suitable substrate is of use as the first and second layers of the present packages and may be chosen by one of skill in the art based upon one or a combination of factors. Non-limiting examples of factors include the product(s) to be contained in the package, storage conditions, shipping conditions, conditions under use, aesthetics, visual differentiation between the layers, and the like. For example, if the product is sensitive to light, opaque substrates are of use. If, for example, the package is to be stored or shipped at high temperatures, substrates that will withstand heat are desirable. If for example, the product is sensitive to moisture, substrates that are moisture impervious are desirable. Non-limiting examples of moisture impervious substrates of use in the present invention include foil laminates, foil/polymer laminates or co-extrusions, metals, polymers, metalized films, clear plastics or combinations thereof. 
         [0046]    Referring now to  FIGS. 1-3 ,  5 ,  8  and  9 , the packages  1000  of the present invention may take any suitable planar shape. The planar shape of the package  1000  may be determined by the planar shape of its first and second layers  10 ,  20 , as well the layers&#39; respective orientation when they are placed in a face to face relation and connected/removably attached. In some embodiments of the invention, the first and second layers are oriented such that when they are placed in a face to face relationship, they overlap. For example,  FIG. 8  shows a plan view of one embodiment in which the package  1000  comprises two overlapping, rectangular first and second layers  10 ,  20  having the same size and shape (the second layer is not visible from this view). In other embodiments, the first and second layers are spatially staggered in a face to face relationship such that when they are connected/removably attached, they do not completely overlap. For example,  FIG. 9  shows a plan view of one embodiment in which the package  1000  comprises rectangular first and second layers  10 ,  20  having the same size and shape that are connected/removably attached such that they do not overlap at the first end  100  of the resulting package  1000 . In further embodiments, first and second layers having similar or identical shapes are placed in a face to face relationship with the second layer flipped in relation to the first layer. When the layers are connected/removably attached, they do not completely overlap at the first end of the resulting package. For example,  FIGS. 1-3  and  5  show plan views of embodiments in which the first end  100  of the packages  1000  comprise first and second layers  10 ,  20  that do not completely overlap. 
         [0047]    Referring now to  FIGS. 1-5  and  10 -I  2 A, the first and second layers  10 ,  20  are removably attached in a face to face relationship by an adhesive pattern. The adhesive pattern may comprise: one seal with a variable peel strength, as shown for example in phantom in  FIG. 10  as seal  510 ; a series of adjoining seals, as shown for example in phantom in  FIG. 11  as seals:  510 ;  520 ;  530 ; and  550 ; or a series of discrete seals, as shown for example in phantom in  FIG. 12A  as seals:  510 A-C;  520 A-D;  530 A-D; and  550  A and B. In some embodiments, a fourth seal is disposed such that it will intersect the cavity formed between the second and third seals, as shown for example in phantom in  FIGS. 1-5  as seal  540 . In embodiments in which the package comprises a first layer and a second layer that are made from two separate pieces of substrate (rather than a single piece of substrate folded onto itself), a fifth seal may connect the two layers together at the second end of the package, as shown for example in phantom in  FIGS. 1 and 4  as seal  550 . 
         [0048]    Referring now to  FIGS. 13-20 , the packages of the present invention may be opened by peeling apart the first and second layers. To peel the layers apart, sufficient force is exerted to overcome the peel force of the seals removably attaching the layers together to form the package. Each seal is characterized by a peel force, which is constant or variable throughout the seal. Peel force is measured as described in the Methods section infra. 
         [0049]    To provide for the controlled opening of the presently invented packages, adhesive patterns and the seals comprising them are chosen so as to regulate the amount of force necessary to peel the first and second layers of the packages apart, without ejecting any product(s) optionally contained therein from the package. For example, in the embodiment shown in  FIG. 13 , a single piece of substrate is folded onto itself forming the first and second layers  10 ,  20  of a package  1000 , which are connected together at the second end  200  of the package by virtue of the resulting fold  560 . The first and second layers  10 ,  20  are removably attached at the first end  100  of the package  1000  and along the first and second opposing longitudinal side edges  300 A,  300 B to the second end  200  of the package by an adhesive pattern. The adhesive pattern comprises  3  seals shown in phantom: a first seal  510  having a peel force “A” disposed proximate to the first end of the package  1000 ; a second seal  520  with a variable peel force that ranges from “B 1 ” to “B 3 ” disposed proximate to the first opposing longitudinal side edge  300 A of the package; and a third seal  530  with a variable peel force that ranges from “C 1 ” to “C 3 ” disposed proximate to the second opposing longitudinal side edge  300 B of the package. 
         [0050]    Proximate to the first end  100  of the package  1000 , the relative peel forces of the three seals may be represented by the formula: 
         [0000]      A≈B 1 +C 1    
         [0000]    wherein: “+” represents “the sum of”; and B 1  is optionally about equal to C 1 . 
         [0051]    Moving from the first end  100  of the package  1000  toward the second end  200  of the package, the peel forces of B 1  and C 1  respectively increase to B 2  and C 2  such that the relative peel forces are now represented by the formula: 
         [0000]      A&lt;B 2 +C 2    
         [0000]    wherein: “+” represents “the sum of”; and B 2  is optionally about equal to C 2 . 
         [0052]    Approaching the second end  200  of the package  1000 , the peel forces of B 2  and C 2  respectively increase further to B 3  and C 3 , such that the relative peel forces are now represented by the formula: 
         [0000]      A&lt;&lt;B 3 +C 3    
         [0000]    wherein: “+” represents “the sum of”; and B 3  is optionally about equal to C 3 . 
         [0053]    In this embodiment, the peeling apart of the first and second layers  10 ,  20  of the package  1000  may be initiated by gripping each layer at the first end  100  of the package between the fingers  900  as shown in plan view in  FIG. 13 , and from a side view in  FIG. 14 . A first pulling force “F 1 ” that is greater than A and B 1 +C, is exerted such that the first seal  510  disposed proximate to the first end  100  of the package  1000 , and portions of the second and third seals  520 ,  530  disposed proximate to the first end of the package  1000 , “fail”. The seals,  510 ,  520 ,  530 , fail in that the portions of the first and second layers  10 ,  20  that had been fastened together by the seals are allowed to separate as shown in plan view in  FIG. 15  and from a side view in  FIG. 16 . 
         [0054]    To further peel apart the layers, a second pulling force “F 2 ” that is greater than B 2 +C 2 , is exerted such that the portions of the second and third seals  520 ,  530  with these peel forces fail as shown in plan view in  FIG. 17 , and from a side view in  FIG. 18 . 
         [0055]    The peel forces B 3  and C 3  are chosen such that a pulling force in great excess to that of F 2  would be necessary to cause those portions of the second and third seals  520 ,  530  with these peel forces to fail. Thus the separation of the first and second layers  10 ,  20  is checked at a point at which the peel forces are about equal to B 3 +C 3 . Optional products  600  are still partially contained by the unopened portion of the package  1000  and are presented for removal as shown in plan view in  FIG. 19 , and from a side view in  FIG. 20 . 
         [0056]    One of skill in the art is able to achieve the separation of the two layers and provide for presentation and removal of any product(s) optionally contained therein by choosing any suitable combination of adhesive patterns of seals, and their relative peel forces. In the embodiments shown in  FIGS. 13-20 , a first seal  510  is disposed proximate to the first end  100  of the package  1000  and second and third seals  520 ,  530  are respectively disposed proximate to the first and second opposing longitudinal side edges  300 A,  300 B of the package. The peel forces of the portions of the second and third seals  520 ,  530  disposed proximate to the first end  100  of the package  1000 , are about equal to the peel force of the first seal  510 . Moving from the first end  100  of the package  1000  toward its second end  200 , the peel forces of the second and third seals  520 ,  530  increase incrementally (from B 1 ,C 1  to B 2 ,C 2  to B 3 ,C 3 ). Alternatively, in some embodiments the increase in the peel strength of the second seal and third seal is continuous over the length of the seal(s). Alternatively, in some embodiments the increase in peel strength of the second seal and third seal is a combination of continuous and incremental over the length of the seal(s). Alternatively, in some embodiments the peel strength of only one of the second and third seals is variable over the length of the seal, either incrementally, continuously or combinations thereof. In some embodiments, the peel force of the first seal may be greater than the peel force of the portions of the second and/or third seals disposed proximate to the first end of the package. In these embodiments, a stronger first seal may prevent accidental or premature opening of the package. In embodiments in which a fifth seal connects two separate pieces of substrate together, the peel force of the fifth seal may also be appropriately chosen such that excessive force would be necessary to break it. 
         [0057]    The point at which the peel force of a seal increases such that excessive force is required to separate the first and second layers of a package is referred to herein as the “stopping point”. At the stopping point, at least a portion of the product(s) optionally contained in the package is exposed for removal therefrom. For example, the stopping point  590  of one embodiment is shown in plan view in  FIG. 19  and from a side view in  FIG. 20 . 
         [0058]    The amount of force required to peel apart the layers of a package may be affected by the geometry of the seal(s), and if there is more than one seal, their relative placement. The relative placement of the portions of a single seal, and/or the relative placement of more than one seal, may be described by their “angular relation”, meaning the angle at which they intersect in a given plane. In the embodiment shown in  FIG. 11 , the angular relation between the first and third seals  510 ,  530  is described by the angle  580 . If the seals do not intersect (as in the case of discrete seals), a straight line may be drawn through each seal, and their angular relation is described by the angle at which the lines ultimately intersect in a given plane. In the embodiment shown in  FIG. 12B  (which is an expanded view of two of the discrete seals of the embodiment shown in  FIG. 12A ), a straight line  720 A is drawn through seal  550 A and a straight line  720 B is draw through  530 D. The angular relation between the seals  550 A and  530 D is described by the angle  519  at which the lines  720  A and  720 B intersect. 
         [0059]    Portions of a single seal and/or more than one seal may be arranged such that they have any suitable angular relation. Angular relations may be defined by obtuse angles, acute angles, right angles or combinations thereof. For example, in the embodiment shown in  FIG. 13 , the desired peel force of the first seal  510  is achieved by making it chevron-shaped such that it may be described by the angle  511  of about 120°. The first seal  510  adjoins each of the second and third seals  520 ,  530  such that their relative placement is described by the obtuse angles  515 . 
         [0060]    Seals may be made using any suitable means. Non-limiting examples of sealing means include mechanical sealing and chemical sealing. Without wishing to be bound by theory, mechanical sealing is believed to involve topographical interference between the layers to be sealed. Non-limiting examples of mechanical sealing include crimping, stamping, interlocking mechanisms and combinations thereof. Interlocking mechanisms may comprise any interlocking shape. Non-limiting examples of interlocking mechanisms include protruding tabs, interlocking tabs, interlocking slots, hook and eye-type systems and combinations thereof. Without wishing to be bound by theory, chemical sealing is believed to involve chemical interaction between the layers. Non-limiting examples of chemical means of sealing include the use of: heat sealing; induction sealing; sonic welding; pressure welding; hot melt adhesives; solvent adhesives; solvent welding; glues; resins; rosins; cross-linking agents; and combinations thereof. 
         [0061]    In embodiments in which the layers of a package comprise thermoplastic materials, heat sealing may be achieved by melting a material or mixture of materials between the layers. The material or mixture of materials may have a melt temperature lower than that of the thermoplastic materials comprising the layers to avoid compromising the integrity of the layers by melting them during the sealing process. 
         [0062]    The packages of the present invention may optionally comprise grip tabs at the first end of the package. Grip tabs may aid in the opening of a package by providing appendages with which to grip each of its first and second layers. The packages of the present invention may comprise grip tabs that are the same or different. 
         [0063]    Grip tabs are provided using any suitable means. In some embodiments of the present invention, the grip tabs comprise unattached portions of the first and second layers at the first end of the packages. For example, in the embodiments shown in  FIGS. 1-5 , grip tabs  700 A and  700 B respectively comprise the unattached portions of the first and second layers  10 ,  20  at the first end  100  of the packages  1000 . In some embodiments, grip tabs are provided by attaching separate substrates by any suitable means to both the first and second layers of the package. For example, in the embodiment shown in  FIG. 21 , the grip tabs  700 A and  700 B are respectively attached to the first layer  10  and second layer (not visible from this view). In further embodiments, a grip tab comprising an unattached portion of a first or second layer and a grip tab comprising a separate substrate attached to the other layer are provided. For example, in the embodiment shown in  FIG. 22 , the grip tab  700 A is a separate substrate attached to the first layer  10 , and the grip tab  700 B is an unattached portion of the second layer  20 . 
         [0064]    Grip tabs may have any suitable shape. The shape of a grip tab may be described by a line traced along the edges of the tab that are not connected to the package; the line is referred to herein as the “edge line”. Referring to  FIG. 23 , the tab  700 A has an edge line  710 . Grip tabs of use in the present invention may have edge lines selected from the group consisting of curvilinear lines, linear lines or combinations thereof. 
         [0065]    Grip tabs may comprise texture. If texture is not already present on the substrates comprising the grip tabs, it may be added using any means known in the art including, but not limited to, coating. Any suitable type of texture is of use in the present invention including, but not limited to, bumps, ridges, knurls, indentations, punctures or combinations thereof. Non-limiting examples of grip tabs with texture are shown as: grip tab  700 A in  FIG. 1 ; grip tab  700 A in  FIG. 5 ; and grip tab  700 A in  FIG. 22 . Texture may help to prevent fingers from slipping from the grip tabs, particularly in moist environments such as bathrooms and kitchens. Texture may additionally or alternatively, provide a tactile means of determining from which end the package is designed to be opened, and/or may aid in distinguishing between the grip tabs. In this way, texture can aid the vision impaired in opening the packages of the present invention. 
         [0066]    Grip tabs may have any suitable appearance. Grip tabs may comprise any color or patterns of color. Grip tabs may be opaque, translucent, transparent or combinations thereof. The grip tabs comprising the packages of the present invention may be the same or different in appearance. Grip tabs that differ in appearance may aid in distinguishing between the grip tabs, particularly for the vision impaired who would otherwise have a difficult time seeing where the tabs can be separated from each another. 
         [0067]    Grip tabs may or may not overlap each other. Grip tabs can overlap as shown for example in plan view in  FIG. 8 , in which only one tab,  700 A is visible. Non-limiting examples of grip tabs that do not overlap are shown in  FIGS. 1-5  and  21 - 23 . Non-overlapping grip tabs may aid in distinguishing between the grip tabs. Non-overlapping grip tabs may also aid in the gripping of each tab, particularly for those who have limited manual dexterity (such as individuals with arthritis). 
         [0068]    The packages of the present invention are designed such that they may contain products. Non-limiting examples of products that may be contained in the present packages include: compositions, creams, formulations, towelettes, toothpicks, powders, adhesives, medicaments, and the like. 
         [0069]    In some embodiments of the present invention, oral care substances, dentifrices and/or oral care devices are contained within the packages. Any oral care device suitable for enclosure in the present packages is of use. Non-limiting examples of suitable oral care devices include toothbrushes, mouth rinses, floss, teeth whitening strips such as Crest™ Whitestrips™ (manufactured by the Procter &amp; Gamble Company, Cincinnati, Ohio), and the like. Any oral care substance or dentifrice suitable for enclosure in the packages of the present invention may be of use. Non-limiting examples of suitable oral care substances may provide denture and/or tooth whitening, denture and/or tooth cleaning, and the like. A number of suitable oral care compositions are disclosed in U.S. Pat. Nos. 5,891,453, 5,879,691, 6,730,316, 6,277,458, 6,045,811, 5,989,569, 6,884,426, and U.S. patent application Ser. Nos. 10/715,003, 10/870,293, 11/455,469 and 60/831356. 
         [0070]    In some embodiments of the present invention, the oral care substance may be a denture adhesive. Suitable denture adhesives may take any form that can be contained in the packages of the present invention. Non-limiting examples of suitable denture adhesive include creams, pastes, gels, liquids, strips, wafers or combinations thereof. A number of suitable denture adhesives are disclosed in U.S. patent application Ser. Nos. 11/590,224, 11/590,233, 11/590,111, 11/590,225, 11/590,191, 11/590,231 and 11/590,232 . 
         [0071]    The packages of the present invention may contain a denture adhesive strip or strips. Referring now to the embodiments shown in  FIGS. 1-5 , denture adhesive strips  600  are shown in phantom within the cavities  30  of the packages  1000 . In embodiments in which the denture adhesive strip  600  is sensitive to moisture, the first and second layers  10 ,  20  forming the package  1000  may be removably attached by an adhesive pattern comprising water tight seal(s)  510 ,  520 ,  530 , (and in some embodiments)  550 , which are located along unconnected portions of the package. 
         [0072]    In embodiments in which the package contains more than one denture adhesive strip, any suitable means of keeping the strips separated may be used. One non-limiting example of a separating means is the use of a fourth seal  540  as shown in  FIGS. 1-4 . The fourth seal  540  may comprise a discrete seal as shown in  FIGS. 2 and 3 , or it may adjoin another seal as shown in  FIGS. 1 and 5 . The peel strength of the fourth seal may be chosen by one of skill in the art to provide for the controlled opening of the present packages. 
         [0073]    In some embodiments, the denture adhesive strip(s) may be removably adhered to a tray.  FIG. 24  shows an embodiment in which denture adhesive strips  600  are removably adhered to a plastic tray  650 , which is sealed in the cavity  30  of the package  1000 . When the package  1000  is peeled opened, the tray  650  may be removed for access to the denture adhesive strip(s)  600 . 
         [0074]    Referring now to  FIGS. 25-28 , a plurality of the packages of the present invention may comprise “primary” packages  1000  that are contained within a larger “secondary” package  2000 . Containment of a plurality of primary packages within a secondary package may provide convenience in the shipping, stocking on store shelves, use (individual or otherwise) and portability of the products contained within the primary packages. 
         [0075]    Any suitable secondary package may be of use. Non-limiting examples of secondary packages include boxes, cartons, pouches, compacts, and the like. The secondary packages may be made of any suitable material. Non-limiting examples of materials include plastics, paper products, and the like. 
         [0076]    In one embodiment, a plurality of primary packages  1000  is contained in a secondary package  2000  comprising clear plastic as shown in  FIG. 25 . The secondary package  2000  is of one-piece construction with a hinged lid  2010 , which has texture  2011  so as to make opening of the package easier, particularly in moist environments. Advantageously, the secondary package  2000  is also clear so it may easily be seen how many primary packages  1000  are contained within the secondary package. 
         [0077]    In another embodiment, the secondary package comprises plastic and cardboard as shown in  FIG. 26 . The bottom of the secondary package  2000  comprises a plastic trough  2060  in which the primary packages  1000  are placed. The top  2300  of the secondary package  2000  comprises a cardboard box which may be slipped on and off of the trough  2060 . The secondary package  2000  optionally has a clear plastic window  2200  through which it may easily be determined how many primary packages  1000  are contained therein. 
         [0078]    In another embodiment, the secondary package  2000  comprises cardboard as shown in  FIG. 27 . The primary packages  1000  are held in a first box  2050 , which is slipped into a sleeve  2100 . The sleeve  2100  optionally has a cut-out window  2200  through which it may easily be determined how many primary packages  1000  are contained therein. 
         [0079]    In another embodiment, a plurality of primary packages  1000  is “linked” together as shown in  FIG. 28 . The primary packages  1000  are linked as a result of being made from two large pieces of substrate layers,  10  and  20 , that are removably connected/removably attached. Lines of weakness  800 , shown here as perforations, make the primary packages  1000  easily separable. These primary packages  1000  are contained in a secondary package  2000  shown in the open position, comprising a one-piece cardboard box with a hinged lid  2010 . 
         [0080]    Methods 
         [0081]    Peel force is measured according to ASTM Test Number F 88-06 using a Model Number 5500R tensile tester from Instron Corp. (Norwood, Mass., USA). 
         [0082]    The dimensions and values disclosed herein are to be understood as not 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”. 
         [0083]    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 written document conflicts with any meaning or definition of the term in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern. 
         [0084]    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.