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KR-102962329-B1 - Low rigidity multi-ply tissue product

KR102962329B1KR 102962329 B1KR102962329 B1KR 102962329B1KR-102962329-B1

Abstract

A multi-layer tissue product, in particular a crepe and air-dried tissue product, is disclosed and has fabric-like properties such as good drapeability and durability. For example, the product generally comprises two layers and has a geometric mean slope (GM slope) of about 10.0 kg or less and a geometric mean tensile energy absorption (GM TEA) of about 15 g·cm/ cm² or more. In certain cases, the tissue product also has a low degree of stiffness, e.g., a stiffness index of about 5.00 or less. The tissue product may be manufactured from a web produced by a print-crepe process in which a latex polymer is deposited on at least one of the outer surfaces of the tissue web.

Inventors

  • 한커, 제이슨 디.
  • 부쉬, 미카엘라 에이.
  • 오'코너, 제시카 제이.
  • 삭스, 마크 더블유.
  • 보그트, 케빈 제이.
  • 맥코믹, 에린 에이.

Assignees

  • 킴벌리-클라크 월드와이드, 인크.

Dates

Publication Date
20260511
Application Date
20200415

Claims (20)

  1. A multi-ply tissue product comprising a first crepeped tissue layer and a second crepeped tissue layer, wherein the multi-ply tissue product has a geometric mean tensile strength (GMT) of about 1,500 to about 2,500 g/3", a geometric mean slope (GM slope) of about 4.0 to about 10.0 kg and a bulk greater than about 12.0 cc/g, and wherein the multi-ply tissue product has a stiffness index of about 3.00 or less.
  2. delete
  3. A product according to claim 1, wherein each of the first and second crepeated tissue layers has a first outer surface and a latex polymer disposed thereon.
  4. A product according to claim 1, wherein each of the first and second crepeated tissue layers has a crepeating composition comprising a first outer surface and essentially a cross-linked vinyl acetate-ethylene polymer, and optionally an anti-blocking agent is disposed on the first outer surface.
  5. The product of claim 1, having a cross-machine direction slope (CD slope) of about 10.0 to about 25.0 kg and a cross-machine direction tensile energy absorption (CD TEA) of about 15.0 to about 24.0 g·cm/ cm².
  6. A product according to claim 1, having a geometric mean tensile energy absorption (GM TEA) of about 20 to about 32 g·cm/ cm² .
  7. A product according to claim 1, having a geometric average elongation rate (GM elongation rate) of more than about 15%.
  8. A product having a TEA index of about 1.00 or more in claim 1.
  9. A product according to claim 1, wherein each of the first and second crepeated tissue layers has a crepeating composition disposed on a first outer surface and on top, wherein the first and second crepeated tissue layers are overlapped together in a face-to-face arrangement such that the first outer surfaces face each other and the crepeating composition is substantially absent from the outer surface of the product.
  10. A product having a CD elongation rate of more than about 12.0% in claim 1.
  11. A product having a wet/dry ratio greater than about 0.40 in claim 1.
  12. A product according to claim 1, having a basis weight of about 50 to about 60 gsm and a bulk of more than about 14.0 cc/g.
  13. A product according to claim 1, having a cross machine direction tension (CD tension) of about 1,200 to about 2,000 g/3".
  14. In claim 1, the first and second tissue layers are air-dried products.
  15. With multi-ply tissue products, a. A first crepeped breathable drying tissue layer having first and second outer surfaces, wherein the first outer surface has a latex binder disposed on top of the first crepeped breathable drying tissue layer; and b. A second crepeated breathable drying tissue layer having a first and second outer surface, wherein the first outer surface comprises a latex binder disposed on top of the second crepeated breathable drying tissue layer; Herein, the first and second layers are overlapped together in a face-to-face arrangement such that the first outer surfaces face each other, wherein the product has a GMT of about 1,500 to about 2,500 g/3", a geometric mean slope (GM slope) of less than about 10.0 kg, and a bulk of about 12.0 to about 16.0 cc/g, and the multi-layer product has a stiffness index of about 3.00 or less.
  16. In item 15, the product comprises a vinyl acetate-ethylene polymer, wherein the latex binder is a latex binder.
  17. delete
  18. In item 15, a product having a geometric average elongation (GM elongation) of about 20 to about 25%.
  19. With multi-ply tissue products, a. A first crepeped breathable drying tissue layer having first and second outer surfaces, wherein the first outer surface has a vinyl acetate-ethylene polymer disposed on top; and b. A second crepeated breathable drying tissue layer having a first and a second outer surface, wherein the first outer surface comprises a vinyl acetate-ethylene polymer disposed on top of the second crepeated breathable drying tissue layer; The above product has a GM TEA of about 20.0 to about 32.0 g·cm/ cm² and a CD elongation of about 12.0 to about 18.0%, and the above multi-ply tissue product has a stiffness index of about 3.00 or less.
  20. In Clause 19, a product having a wet/dry ratio greater than about 0.40.

Description

Low rigidity multi-ply tissue product The present invention relates to a low-rigidity multi-ply tissue product. Tissue products, such as facial tissues, paper towels, bathroom tissues, napkins, and other similar products, are designed to possess various important characteristics. For instance, the product must have good bulk and a soft touch, as well as sufficient strength and durability to withstand use. Additionally, to improve wiping efficiency, it may be desirable to provide the product with a certain degree of surface texture. However, unfortunately, taking steps to improve one characteristic of the product often adversely affects other characteristics. One means of balancing important tissue product characteristics is to manufacture the product by a process that does not compress the initial web during drying. This process often consists of non-compression drying techniques in which the initial web is formed to conform to the contours of a patterned fabric that supports the web as it dries. The wet-formed web is typically dried by passing heated air over both the fabric and the wet web as it is transported over a cylindrical dryer. In this way, a three-dimensional pattern is imparted to the web while its bulk is maintained. One widely used non-compressed drying process used to manufacture tissue products is air drying, which consists of transferring a wet laid web onto a rough, highly permeable air-drying fabric endowed with a three-dimensional surface topography. The wet laid web is formed into an air-drying fabric and supported by the fabric until it is at least nearly completely dried. The resulting dried web is bulkier than a compressed dehydrated tissue web, such as a wet pressurized web, because fewer paper bonds are formed and the web is not pressurized and dense. Aeration drying also allows papermakers to modify the machine direction (MD) characteristics of the tissue web by adjusting the speed of the aeration-dried fabric relative to other belts in the manufacturing process. This speed difference, often referred to as rapid transfer, can be used to modify MD elongation and modulus, as disclosed in U.S. Patent No. 8,956,503 by Hermans et al. Increasing MD elongation and decreasing MD modulus at a given tensile strength will generally increase durability and decrease the stiffness of the tissue product. Modifying these characteristics can also improve manufacturing efficiency, particularly the efficiency of conversion operations, which benefits from increased durability. Although the process disclosed by Hermans et al. has provided significant advancements in the field of technology for manufacturing tissue products with deformed MD characteristics, there is still a need for tissue products that are cloth-like and possess high drapability. In particular, there is a need for tissue products with low elastic modulus in both machine and cross-machine directions. The inventors have now successfully manufactured a tissue product, in particular a roll of paper towel comprising a plurality of sheets separated from one another by perforations that can be broken to provide individual sheets, which has a machine direction (MD) modulus of elasticity referred herein with an MD slope of less than about 5.0 kg and a cross machine direction (CD) modulus of elasticity referred herein with a CD slope of less than about 10.0 kg. The low MD and CD modulus provides a tissue product having a low stiffness index, measured as the geometric mean slope divided by the geometric mean tensile strength, such as a stiffness index of less than about 5.0. Surprisingly, the reduction in stiffness does not reduce durability. For example, the tissue product of the present invention may have a geometric mean tensile energy absorption, a measure of the amount of energy absorbed by the tissue at break, which is greater than about 15.0 g·cm/ cm² . The aforementioned characteristics can be achieved even at relatively moderate tensile strengths, such as a geometric average tensile strength of less than about 2,500 g/3". The resulting tissue product possesses fabric-like properties such as high durability, good drapability, and a soft touch. Accordingly, in one embodiment, the present invention provides a multi-ply tissue product, such as a tissue product comprising two or more air-drying tissue layers, said product having a geometric mean tensile strength (GMT) of about 1,500 to about 2,500 g/3" and a geometric mean slope (GM slope) of less than about 10.0 kg, e.g., about 4.0 to about 10.0 kg. In a given example, an improved GM slope can be achieved by reducing the cross machine direction (CD) slope of the product to less than about 20.0 kg, e.g., about 14.0 to about 20.0 kg. In a particularly preferred embodiment, the tissue product of the present invention has a high bulk, for example, greater than about 10.0 cc/g, more preferably greater than about 12.0 cc/g and even more preferably greater than about 14.0 cc/g, for example, about