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  Multi-ply absorbent paper product having impressed patternUSPTO Application #: 20060283538Title: Multi-ply absorbent paper product having impressed pattern Abstract: A multi-ply tissue includes a first cellulosic embossed ply having an emboss pattern applied over a portion of its surface and a second cellulosic embossed ply of tissue. The first ply is contact laminated to the second ply so that the primary adhesion between the plies of tissue is the result of contact between cellulosic fibers. The first and second plies contact one another in contact-areas, with the contact areas between the first and second plies defining compliant voids. The contact areas between the first ply and the second ply are elongated and/or rounded contact areas. A method of forming a multi-ply tissue involves conveying a base sheet through a nip between an impression roll and a pattern roll to produce an embossed base sheet having a back side possessing projections, applying adhesive to the back side of the embossed base sheet at spaced apart locations, and applying a flat backing sheet to the back side of the embossed base sheet so that the backing sheet adheres to the back side of the embossed base sheet at said spaced apart locations. A method of producing an embossed tissue involves successively conveying a base sheet through a nip between a first impression roll and a pattern roll, and conveying the base sheet through another nip between the pattern roll and a second impression roll, wherein the second impression roll is made of rubber having a lower hardness than the rubber from which the first impression roll is made. (end of abstract) Agent: Patent Group Ga030-43 Georgia-pacific Corporation - Atlanta, GA, US Inventors: Galyn A. Schulz, Gary L. Worry, Kang C. Yeh, Thomas N. Kershaw USPTO Applicaton #: 20060283538 - Class: 156219000 (USPTO) Related Patent Categories: Adhesive Bonding And Miscellaneous Chemical Manufacture, Methods, Surface Bonding And/or Assembly Therefor, With Permanent Bending Or Reshaping Or Surface Deformation Of Self Sustaining Lamina, Surface Deformation Only Of Sandwich Or Lamina (e.g., Embossed Panels) The Patent Description & Claims data below is from USPTO Patent Application 20060283538. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a division of U.S. application Ser. No. 09/564,800, filed May 5, 2000, which claims priority to and the benefits under 35 U.S.C. .sctn.119(e) of U.S. application Ser. No. 60/162,981, filed Nov. 1, 1999, both of which are incorporated herein by reference in their entireties. FIELD OF THE INVENTION [0002] This invention generally related to absorbent paper products, including tissue paper, towels, wipes and napkins. More particularly, the present invention pertains to an embossed multi-ply absorbent paper product. BACKGROUND OF THE INVENTION [0003] Consumer acceptance of absorbent paper products such as tissue paper products and the like is influenced by the perceived softness of the tissue product. Indeed, the consumer's perception of the desirability of one tissue product over another is based in significant respects on the perceived relative softness of the tissue products; the tissue product that is perceived to be more soft is typically perceived to be more acceptable. [0004] Thus, tissue paper should ideally possess a relatively high emboss definition and bulk, and a relatively high degree of perceived puffiness and softness. The emboss definition and bulk of the tissue paper is commonly found to affect the perceived softness of the tissue paper. In addition, the tissue paper should possess sufficient strength. However, it is typically the case that improving one or more of these parameters of the tissue paper adversely affects one or more of the other parameters. For example, applying a very heavy embossing to the tissue product increases the embossing definition and bulk of the tissue paper, but also increases the friction so that the perceived softness is reduced. Also, a reduction in the strength of the tissue product results. On the other hand, a less heavily embossed tissue product might possess better strength characteristics and smoothness attributes, but the perceived puffiness and softness of the tissue product would be adversely affected. [0005] Conventional deep embossing of two-ply tissue paper involves conveying two plies of tissue paper through a nip formed between a steel roll and a rubber roll. While this type of embossing is able to provide better emboss definition and puffiness, it also increases the back side friction which thus reduces tissue softness. Also, the rather heavy embossing adversely affects the strength of the resulting multi-ply tissue. [0006] U.S. Pat. No. 3,708,366 describes a method of producing two-ply paper towel in which one ply is more severely embossed than the other ply. This patent is not specifically related to the manufacture of tissue paper products. Moreover, the patent describes that the preferred embossments are in the shape of a frustum of a cone. This embossment shape produces non-elongated and rather sharply defined contact regions between the two plies which have been found to result in a paper towel product having a rather harsh feel. While this resulting feel of the product may be acceptable from the standpoint of paper towel products such as that with which the aforementioned patent is concerned, it is a result that is not well suited for tissue paper products. [0007] There thus exists a need for a tissue product having better perceived softness and bulk along with better emboss definition, without unduly degrading the strength characteristics of the tissue product. [0008] A need also exists for a tissue that is heavily embossed, but which does not have the roughened characteristics typically associated with such heavily embossed tissue. When multiple sheets are embossed together, the nubs or protuberances on the back side of the tissue are perceived as being rough by the consumer. [0009] A need also exists for a one ply embossed sheet that does not possess a two-sided look or appearance. One ply embossed sheets are typically embossed with matched steel-to-steel rolls and this produces the undesirable two sided look or appearance. Aside from this, the use of steel-to-steel emboss rolls to produce the one ply embossed tissue creates undesirable paper dust and has a tendency to damage the steel emboss rolls. SUMMARY OF THE INVENTION [0010] According to one aspect of the invention, a multi-ply tissue includes a first cellulosic embossed ply having an emboss pattern applied over from three to twelve percent of its surface to a depth of at least about thirty thousandths of an inch, and a second cellulosic embossed ply of tissue in which the depth of emboss applied to the second ply is no more than about 80% of the depth of emboss applied to the first ply. The first ply is contact laminated to the second ply, with the primary adhesion between the plies of tissue being the result of contact between cellulosic fibers rather than through an intermediate adhesive. The first and second plies contact one another in contact areas, with the contact areas between the first and second plies defining compliant voids and with the total contact area being no more than about fifteen percent of the area of the tissue sheets. [0011] According to another aspect of the invention, a method of producing a two ply issue involves embossing a first ply of tissue so that the first ply of tissue possesses an emboss pattern and embossing a second ply of tissue so that the second ply of tissue possesses an emboss pattern, with the first ply being more heavily embossed than the second ply. The first and second plies are nested together to contact laminate the first ply to the second ply with contact areas between the first and second plies, the contact areas being elongated or gently rounded. [0012] In accordance with another aspect of the invention, a method of producing a two ply tissue involves conveying a base sheet through a nip between an impression roll sometimes made of rubber and a pattern roll sometimes made of steel to emboss a pattern on the base sheet and produce an embossed base sheet having a back side possessing projections produced by the pattern roll, applying adhesive to the back side of the embossed base sheet at spaced apart locations so that portions of the back side of the embossed base sheet between the projections are devoid of adhesive, and applying a flat backing sheet that is devoid of embossing to the back side of the embossed base sheet to cause the backing sheet to adhere to the back side of the embossed base sheet at the spaced apart locations. [0013] A still further aspect of the invention involves a multi-ply sheet that includes an embossed base sheet having a back side possessing projections, adhesive on the back side of the embossed base sheet at spaced apart locations so that portions of the back side of the embossed base sheet between the projections are devoid of adhesive, and a flat backing sheet devoid of embossing and adhered to the back side of the embossed base sheet at the spaced apart locations. [0014] Another aspect of the invention involves a method of producing an embossed tissue that involves conveying a base sheet through a nip between a first impression roll and a pattern roll to push portions of the base sheet into indented portions of the pattern roll, conveying the base sheet through a nip between the pattern roll and a second impression roll made of rubber having a lower hardness than the rubber from which the first impression roll is made to push the portions of the base sheet further into the indented portions of the pattern roll to produce an embossed tissue. BRIEF DESCRIPTION OF THE DRAWINGS [0015] The foregoing and additional details and features associated with the present invention will become more apparent from the following detailed description considered with reference to the accompanying drawing figures in which like elements are designated by like reference numerals and wherein: [0016] FIG. 1 is a schematic illustration of an apparatus for embossing a paper product in accordance with one aspect of the present invention; [0017] FIG. 2 is a front view of the roller arrangement used in the apparatus shown in FIG. 1; [0018] FIG. 3A is a schematic illustration of an alternative arrangement for carrying out double depth embossing in accordance with the present invention; [0019] FIG. 3B is a cross-sectional view of a portion of the interface between one of the pattern rolls and one of the impression rolls shown in FIG. 3A; [0020] FIG. 3C is a cross-sectional view of a portion of the interface between the other pattern roll and impression roll used in the apparatus shown in FIG. 3A; Continue reading... Full patent description for Multi-ply absorbent paper product having impressed pattern Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Multi-ply absorbent paper product having impressed pattern patent application. Patent Applications in related categories: 20080105366 - Method for producing plastic products with reinforced heat sealed joints - An envelope is made by at least heat sealing two face sheets. Each face sheet has thick marginal parts and spaced apart thick connection parts. The envelope has at least one heat-sealed peripheral joint, and a plurality of spaced apart heat-sealed seams. The heat-sealed seams are provided on the thick ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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