Abstract:
The invention includes a method of packaging paper products (such as facial tissue) in a dispenser. A clip of paper product is folded. The folded clip has a central region and a pair of opposing peripheral regions separated from one another by the central region. The peripheral regions of the folded clip are pressed toward one another to compress the peripheral regions. After the peripheral regions are compressed, the folded clip is transferred into the dispenser.

Description:
TECHNICAL FIELD  
         [0001]    The invention pertains to methods of packaging paper products, and in particular applications pertains to methods of packaging facial tissue in a dispenser.  
         BACKGROUND OF THE INVENTION  
         [0002]    A method of packaging paper products, such as facial tissue, which has gained acceptance in the marketplace is to fold a stack of paper product sheets about a central axis and then provide the sheets within a boutique-type box. The box has a perforation extending therethrough to the central region of the folded sheets, and such allows a consumer to withdraw the sheets from the box. The packaging can have an advantage in that the box of folded paper product can have a smaller footprint that would a box of non-folded paper product. Also, in many cases consumers associate a box of folded paper product with a premium line of product, rather than with lower-tier product. Examples of facial tissue products marketed in boutique-type boxes are ALBERTSON&#39;S™ “WHISPER SOFT IMAGES”™; HYVEE™ “SOFT ESSENTIALS TREASURES”™; and KLEENEX™ “ULTRA SOFT DOUX”™.  
           [0003]    The box having the folded tissue therein is a dispenser. Ideally, the tissue will be dispensed one-at-a-time through the perforation which extends into the box. However, it is frequently found that the first several sheets do not dispense smoothly in a one-at-a-time manner. Instead the sheets bind within the box and either tear as they are being pulled from the box, or come out as a clump of four or five tissues. Since the tissues within a boutique-type dispenser are associated with premium product, there can be heightened consumer dissatisfaction with the poor dispensing of the first few sheets than would occur with packaging not associated with premium product.  
           [0004]    The problem of having the first few sheets dispensed poorly from a boutique-type dispenser has existed for years, and to date there has not been a satisfactory solution to the problem. A recent study by Potlatch Corporation has shown that there are times when at least sixty percent of the boutique-type dispensers produced for a line of premium paper product will fail to appropriately dispense the first sheet of product, and there can even be times when eighty percent or more of the packages fail to appropriately dispense the first sheet of tissue product.  
           [0005]    FIGS.  1 - 3  illustrate an exemplary process for providing facial tissue within a boutique-type box. Referring initially to FIG. 1, an arrangement  8  is shown comprising a clip  10  of facial product folded around a ski  14 . The clip comprises a plurality of individual tissue sheets  12  (only some of which are labeled). The term “clip” is known in the art to refer to a stacked plurality of sheets which have been appropriately sized to be provided within a package.  
           [0006]    The ski  14  has an edge  16 , and opposing lateral surfaces  18  extending upwardly from the edge. The clip  10  comprises a central region  20  proximate the edge  16  of ski  14 . Clip  10  further comprises peripheral regions  22  and  24  on opposing sides of central region  20 , with the peripheral regions extending along lateral edges  18  of ski  14  in the shown folded configuration of the clip.  
           [0007]    Clip  10  would be folded about ski  14  utilizing an apparatus (not shown) which forces peripheral regions  22  and  24  upwardly relative to central region  20  of the clip.  
           [0008]    [0008]FIGS. 2 and 3 illustrate an apparatus  30  comprising the clip and ski arrangement  8 , and further comprising a holder  32  configured to retain a package  34  thereon. Package  34  can correspond to a boutique-type dispenser. In the shown configuration, a perforation (not visible in FIGS.  2 - 4 ) would be at a bottom surface  36  of dispenser  34 , and ultimately a consumer would remove tissue of clip  10  from dispenser  34  through the perforation. Dispenser  34  has a series of flaps  38 ,  40  and  42  associated therewith, and such flaps surround an opening (not visible in the views of FIGS. 2 and 3).  
           [0009]    The ski  14  of FIGS. 2 and 3 extends along a longitudinal direction  15 , and comprises a length  17 . In operation, the folded clip  10  is slid along a portion of length  17  of ski  14 , and ultimately is slid off from ski  14  and along an axis  44  into the opening within dispenser  34 . FIG. 2 shows the clip at a processing stage at which the clip is along the ski, and FIG. 3 shows the clip at a processing stage after it has been slid off from the ski and into the dispenser. The clip  10  of FIG. 3 is shown in phantom view to indicate that the clip is within dispenser  34 . It is noted that clip  10  is generally moved from the ski to the dispenser by a conveying mechanism (not shown) such as a block or plurality of fingers configured to engage a surface of the clip and push the clip along the axis  44 .  
           [0010]    [0010]FIG. 3 illustrates that the flaps  38 ,  40  and  42  (FIG. 2) have been folded over to retain clip  10  within package  34 .  
         SUMMARY OF THE INVENTION  
         [0011]    In one aspect, the invention encompasses a method of packaging paper products in a dispenser. A clip comprising a stacked plurality of paper products is provided. Also, a ski is provided. The ski comprises a first surface extending longitudinally along the first direction, and has a pair of second surfaces extending transversely from the first surface. The clip is folded around the ski. The folded clip has a central region along the first surface of the ski, and has a pair of opposing peripheral regions separated from one another by the central region. The folded clip is slid off from the ski and subsequently the peripheral regions of the folded clip are pressed toward one another to compress the peripheral regions. After the peripheral regions are compressed, the folded clip is transferred into the dispenser. The peripheral regions can be subjected to at least about 1 pound per square inch gauge (psig) of pressure during the pressing.  
           [0012]    In further aspects, the invention encompasses methods of packaging facial tissue. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]    Preferred embodiments of the invention are described below with reference to the following accompanying drawings.  
         [0014]    [0014]FIG. 1 is a diagrammatic end-view of a prior art arrangement comprising a clip of paper product sheets folded around a ski.  
         [0015]    [0015]FIG. 2 is a diagrammatic side view of a prior art apparatus utilized for inserting a folded clip of paper product into a package.  
         [0016]    [0016]FIG. 3 is a view of the prior art apparatus of FIG. 2 shown at a processing stage subsequent to that of FIG. 2.  
         [0017]    [0017]FIG. 4 is a diagrammatic side view of an apparatus utilized for inserting a folded clip of paper product into a package in accordance with an aspect of the present invention.  
         [0018]    [0018]FIG. 5 is a diagrammatic end-view of an arrangement comprising a folded clip of paper product in accordance with an exemplary method of the present invention.  
         [0019]    [0019]FIG. 6 is a diagrammatic end-view of an arrangement comprising a folded clip of paper product around a ski in accordance with an exemplary method of the present invention.  
         [0020]    [0020]FIG. 7 is a diagrammatic side view of an exemplary ski which can be utilized in methodology of the present invention.  
         [0021]    [0021]FIG. 8 is a diagrammatic end view of the FIG. 7 ski, along the line  8  of FIG. 7.  
         [0022]    [0022]FIG. 9 is a black and white photograph showing a prior art assembly comprising a boutique-type package having a folded clip retained therein.  
         [0023]    [0023]FIG. 10 is a black and white photograph of an assembly comprising a folded clip within a boutique-type package and formed in accordance with an aspect of the present invention.  
         [0024]    [0024]FIG. 11 is black and white photograph of an assembly comprising a folded clip retained within a boutique-type package and formed in accordance with another aspect of the present invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0025]    One aspect of the invention is a recognition that a reason the first few sheets of tissues are difficult to remove from a boutique-type box can be that the first few sheets are tightly pushed against the interior sides of the boutique-type box, and accordingly friction makes it difficult to withdraw the first few sheets. Once the first few sheets have been removed, the remaining sheets can be more easily withdrawn because the pressure between the remaining sheets of the clip and the interior sidewall of the box decreases as sheets are removed and the bulk of the remaining clip is thereby reduced.  
         [0026]    Various methods have been investigated for reducing the overall bulk of a folded clip within a boutique-type box in an effort to reduce the friction of the outermost sheets of the clip relative to an interior surface of the box. Among such methods are to increase the dimensions of the box, or decrease the number of sheets in a clip. Neither method is considered satisfactory. If the dimensions of the box are increased, then the footprint of the box will increase which means that less boxes can be included on the same amount of shelf space as are presently being provided. Also, an increase in the dimensions of a boutique-type box would create complications in the transport and distribution of the boxes. A reduction in the total number of sheets contained within a box can create problems with consumer perception of the quality of the package. Specifically, each box of tissue is generally prominently labeled with the number of sheets in the box. Consumers would likely be dissatisfied if the number of sheets in boxes of premium tissue were suddenly reduced, even if such translated into better dispensing of the first of the remaining sheets from the box.  
         [0027]    [0027]FIG. 4 shows an apparatus  50  which can be utilized in various aspects of the present invention. Similar numbering will be utilized in referring to FIG. 4 as was used above in referring to FIGS. 2 and 3, where appropriate. The apparatus of FIG. 4 is similar to that of FIGS. 2 and 3, except that a compression unit  52  is provided between ski  14  and dispenser  34 . In operation, folded clip  10  is slid off from ski  14  and into the compression unit, squeezed by the compression unit, and then transferred into dispenser  34 . The squeezing of clip  10  by the compression unit prior to insertion of the clip into the dispenser is found to reduce friction of peripheral edges of the clip relative to internal sidewalls of the dispenser, and to thus improve dispensing of the first few sheets of the clip from the dispenser.  
         [0028]    [0028]FIG. 5 illustrates operation of the compression unit  52  for reducing the bulk associated with a folded clip prior. More specifically, FIG. 5 shows an arrangement  100  comprising the clip  10  folded and compressed within compression unit  52 . Clip  10  comprises a stacked plurality of paper products  106  (only some of the individual paper products are labeled). The paper products can correspond to, for example, facial tissue.  
         [0029]    Clip  10  comprises a central region  120  and comprises a pair of opposing peripheral regions  122  separated from one another by the central region. In the shown aspect of the invention, clip  10  is folded approximately in half. Accordingly, peripheral regions  122  correspond to folded regions separated from one another by the fold and each comprising about one-half of the total clip.  
         [0030]    Compression unit  52  comprises a pair of plates  130  which press against the peripheral regions  122  of clip  10 . A compressive force applied to plates  130  is illustrated diagrammatically by arrows  132  and  134 . The force against the plates can be generated utilizing, for example, one or more of electric, hydraulic or pneumatic power sources.  
         [0031]    Preferably, peripheral regions  122  are subjected to at least about 1 pound per square inch gauge (psig) of pressure during the compression of the peripheral regions with plates  130 . In particular applications, the pressure can be at least about 5 psig, and least about 10 psig, and at least about 15 psig. In some applications, the pressure can be greater than or equal to about 15 psig, and less than or equal to about 400 psig.  
         [0032]    It is found that if too much pressure is applied, desirable qualities of the individual sheets can be compromised, and even lost. Also, it is found that if too little pressure is applied, the bulk of the peripheral regions of the clip is not sufficiently reduced to avoid the problems associated with withdrawal of the first few sheets of the clips that were discussed above with reference to the prior art. It can be desired to apply from at least about 10 psig of pressure to less than or equal to about 100 psig of pressure to peripheral regions  122 , and even more desired to apply from at least about 20 psig of pressure to less than or equal to about 80 psig of pressure to peripheral regions  122 . In exemplary applications, about 50 psig of pressure is applied to peripheral regions  122 , and in other applications about 80 psig of pressure is applied to peripheral regions  122 .  
         [0033]    The pressure at peripheral regions  122  can be applied for a time of less than or equal to about 10 seconds (such as a time of from about 1 second to about 10 seconds, or a time of less than or equal to about 5 seconds), and can be applied at typical operating temperatures utilized in paper production factories, such as, for example, temperature of from greater than 0° C. to less than or equal to about 40° C.  
         [0034]    After the compression described with reference to FIG. 5, the clip  10  can be slid into a package utilizing processing analogous to that described above with reference to prior art FIGS. 2 and 3. Specifically, plates  130  are withdrawn from peripheral surfaces  122  of clip  10 , and the clip is subsequently slid into a package.  
         [0035]    Although the clip is typically slid off from the ski prior to the compression of the peripheral regions of the clip, the ski shape can still influence physical properties of the compressed clip. It is found that it can be advantageous to utilize a narrow ski, rather than a wide ski, in various methods of the present invention. However, a problem which can occur when a narrow ski is utilized is that the clip can rotate relative to the ski so that the clip is skewed in its ultimate orientation within a package. Such is illustrated in FIGS. 9 and 10. Specifically, FIG. 9 shows a prior art package comprising a folded clip of facial tissue within a boutique-type box. A side of the box has been opened so that the clip can be seen in its ultimate orientation within the box. A perforation (not clearly visible in the view of FIG. 9) is at the top of the box, and in operation a consumer would reach through the perforation to pull a sheet of facial tissue from the folded clip. Ideally, the folded clip would be oriented in the box such that a highest point of the clip is directly under the perforation at the top of the box, and so that each of the peripheral sides of the clip would have approximately the same pressure against an interior side of the box as one another. The shown prior art clip of FIG. 9 is slightly skewed in the box, but the orientation is reasonable in that both sides of the clip have about the same amount of overlap with interior sides of the box. It is noted that the folded clip of FIG. 9 has a relatively wide hole in the middle, evidencing that the ski utilized to insert the clip into the package was relatively wide.  
         [0036]    [0036]FIG. 10 illustrates a clip formed around a narrow ski prior to being inserted into the package. Note that the central region of the clip does not have the wide gap of the FIG. 9 clip, which evidences that the FIG. 10 folded clip came off of a narrower ski than did the FIG. 9 folded clip. The FIG. 10 clip is skewed significantly more than the FIG. 9 clip, as evidenced by the fact that the shown left side of the clip rubs against an interior side of the package whereas the shown right side of the clip does not even contact the interior right side of the box. The excessive skew of the FIG. 10 clip is undesired. The excessive skew can cause tissue to pull unevenly from the clip due to the significantly increased friction along the left side of the clip relative to the right side. As the tissue pulls unevenly from the clip, clumping of remaining tissue within the FIG. 10 package can occur, which can lead to tearing of the sheets as a consumer attempts to withdraw the clump, and/or to multiple sheets coming out simultaneously.  
         [0037]    [0037]FIG. 11 illustrates a folded clip that has been formed around a narrow ski and subsequently inserted into a package in a desired configuration. Specifically, a top surface of the clip is directly under a perforation (not visible in the view of FIG. 11) at the top of the package, and the clip is symmetric so that the left and right sides of the clip rub about equally on interior sidewalls of the package.  
         [0038]    It is desired to increase the number of packages having the desired configuration of FIG. 11 relative to the packages having the undesired configuration of FIG. 10. The FIG. 10 problems and FIG. 11 advantages can occur regardless of whether the compression unit  52  of FIGS. 4 and 5 is present. If the compression unit is not present and the clip is transferred directly from the ski into the dispenser, poor orientation of the clip from the ski will typically be directly translated into a poor orientation of the clip in the dispenser. If the clip is transferred from the ski to the compression unit, poor orientation of the clip from the ski can lead to compression of the clip along an undesired axis and a resulting poor fold orientation. The poor fold orientation can then translate into a poor orientation of the clip in the dispenser.  
         [0039]    [0039]FIG. 6 illustrates one method for enhancing control of the orientation of a clip as it is slid off from a ski. In referring to FIG. 6, similar number will be utilized as was used above in describing FIGS.  2 - 5 , where appropriate. FIG. 6 illustrates an assembly  200  comprising clip  10  folded around a ski  220 . Ski  220  has a different shape than conventional skis. Ski  220  comprises an edge  224  between a pair of laterally-extending surfaces  226 . A notch (or cavity)  228  extends into edge  224 . Notch  228  can extend, for example, at least about ¼ inch or at least about ½ inch into the edge. In the shown embodiment, edge  224  comprises a width “W”, and notch  228  is approximately centered relative to the width. Ski  220  typically extends longitudinally analogously to the ski  14  of FIG. 2. Further, ski  220  will comprise a longitudinal length, analogous to the length  17  of prior art ski  14 . In particular embodiments, notch  228  can extend along at least a portion of length of the ski. In some aspects the notch can extend along at least a fourth of the length of the ski and in further aspects can extend along an entirety of the length of the ski.  
         [0040]    Notch  228  can assist in retaining clip  104  in a particular orientation relative to ski  220 . Specifically, notch  228  provides additional surfaces for retaining clip  104  as the clip is slid off from ski  220  and into a package. Accordingly, notch  228  can assist in reproducibly and consistently orienting clips of stacked tissue in a desired configuration within a dispenser. Such can enable the desired FIG. 9 configuration of a package, for example, to be reproducibly obtained.  
         [0041]    [0041]FIGS. 7 and 8 illustrate an exemplary ski  302  that can be utilized in methodology of the present invention. Ski  302  comprises a first (or bottom) surface  308  extending longitudinally along a first direction (with the longitudinal direction of the ski being analogous to the direction  15  of FIG. 2). Ski  302  further comprises a pair of second surfaces  310  which extend upwardly relative to first surface  108 . In particular applications, surface  308  can be referred to as an edge, and surfaces  310  can be referred to as opposing lateral surfaces extending from the edge. Ski  302  can be referred to generically as a bar  
         [0042]    Ski  302  can have an edge width of less than or equal to about one inch, less than or equal to about ¾ inch, and in particular applications can have a width of less than or equal to about one-half inch.  
         [0043]    The edge  308  of ski  302  is illustrated as being curved upwardly between lateral surfaces  310  to form a cavity  320 . Cavity  320  can have a depth of about ⅛ inch. Corners  322  are formed where edge  308  joins surfaces  310 , and such corners can aid in retaining and orienting a clip folded around the lower portion of ski  302 .  
         [0044]    Ski  302  has a ramped portion  330  of the lower surface, which can extend at, for example, about a 9° angle relative to the non-ramped portion of the lower surface. The ramped portion can aid in releasing a folded clip from the ski.  
         [0045]    In compliance with the statute, the invention has been described in language more or less specific as to structural and methodical features. It is to be understood, however, that the invention is not limited to the specific features shown and described, since the means herein disclosed comprise preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted in accordance with the doctrine of equivalents.