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JP-7855324-B2 - Top sheet containing natural fibers

JP7855324B2JP 7855324 B2JP7855324 B2JP 7855324B2JP-7855324-B2

Inventors

  • ロドリゴ、ロザーティ
  • グエルテキン、エルデム
  • コーネリア、シュプレンガルト－アイヒェル
  • ルイージ、ディ、ジローラモ－ガラッソ
  • リーゼロッテ、アンドレア、ベナー

Assignees

  • ザ プロクター アンド ギャンブル カンパニー

Dates

Publication Date
20260508
Application Date
20211012
Priority Date
20171019

Claims (12)

  1. A top sheet (24) for use in an absorbent article, having at least a first layer (1) and a second layer (2), wherein the first layer has a first surface and an opposing second surface, and contains at least 15% by weight of natural fibers relative to the total weight of the first layer. The first layer (1) has a plurality of holes (5), and the first layer (1) includes land regions (8) between most of the holes (5), The first surface land region contact angle on the land region (8) of the first surface of the first layer (1) between the majority of the holes (5) is greater than 70° according to the contact angle test method. At least 50% of all pores in the first layer (1) are hydrophilic, The top sheet has an outflow of less than 40% according to the outflow test method. The second layer (2) has a first surface and an opposing second surface, and the second layer (2) includes a plurality of holes (5) and a land region (8) between the majority of the holes (5), and the first surface of the second layer (2) is in a relationship with the second surface of the first layer (1), so that the holes (5) of the second layer (2) are aligned with the holes (5) of the first layer (1), and the first layer (1) and the second layer (2) are in contact with and joined to each other within the land region (8) of the first and second layers (1, 2). The holes (5) in the first layer (1) penetrate at least partially through the holes (5) in the second layer (2), A top sheet (24) in which the contact angle of the second surface land region of the second layer (2) between the majority of the holes (5) is 70° or less according to the contact angle test method.
  2. The top sheet (24) according to claim 1, wherein the plurality of pores are uniformly distributed within the first layer.
  3. The top sheet (24) according to claim 1 or 2, wherein the contact angle of most of the holes is 70° or less according to the contact angle test method, and the contact angle of the first surface land area is at least 10° higher than the contact angle of the holes.
  4. The top sheet (24) according to any one of claims 1 to 3 , wherein the top sheet has an discharge and intake of less than 2 g/g at a 30 cm water column according to a capillary discharge test method.
  5. The top sheet (24) according to any one of claims 1 to 4 , wherein at least 75% of the pores of the first layer (1) are hydrophilic.
  6. The top sheet (24) according to any one of claims 1 to 5 , wherein the second layer (2) comprises synthetic fibers, natural fibers, and/or a combination thereof, and the synthetic fibers are single-component fibers, multi-component fibers, and a combination thereof.
  7. The top sheet (24) according to any one of claims 1 to 6, wherein the second layer (2) has no protrusions, and the region of the second layer (2) that coincides with the protrusions (9) of the first layer is flat.
  8. The top sheet (24) according to any one of claims 1 to 7 , wherein the first layer (1) is attached to the second layer (2) within a bonding region by a hot melt adhesive, and the hot melt adhesive is hydrophilic.
  9. The top sheet (24) according to any one of claims 1 to 8, wherein the first layer (1) includes a spunlace nonwoven fabric layer, and the spunlace nonwoven fabric layer contains natural fibers in an amount of at least 50% by weight relative to the total weight of the first layer (1).
  10. The top sheet (24) according to any one of claims 1 to 9 , wherein the natural fiber is a cotton fiber.
  11. An absorbent article (20) having a longitudinal center line (80) and a transverse center line (90) perpendicular to the longitudinal center line, A top sheet (24) according to any one of claims 1 to 10 , Back seat and, It includes an absorbent core positioned at least partially between the back sheet and the top sheet, An absorbent article (20) in which the first surface of the first layer (1) of the top sheet faces the wearer's skin during use of the article, and the second surface of the first layer (1) faces the absorbent core.
  12. A top sheet (24) according to any one of claims 1 to 10 , The first layer (1) contains at least 80% by weight of natural fibers relative to the total weight of the first layer. The first layer (1) comprises 5% to 40% by weight of hydrophilic fibers selected from the group consisting of synthetic fibers, natural fibers and/or combinations thereof, and 60% to 95% by weight of hydrophobic natural fibers relative to the total weight of the first layer (1). The top sheet (24) has an outflow rate of less than 40% according to the outflow test method.

Description

The present invention provides a top sheet having a leakage rate of less than 40% according to the leakage test method described herein. The top sheet can be used in personal hygiene items such as infant diapers, training pants, feminine hygiene napkins, or adult incontinence products. Personal hygiene absorbent articles, such as infant diapers, toddler training pants, adult incontinence underwear, and/or sanitary napkins, are designed to absorb and contain excrement, particularly large amounts of urine, soft stool (BM), and/or menstrual blood. These absorbent articles may include, among other things, several layers that provide different functions, and if desired, layers (e.g., a capture layer, a distribution layer, etc.), such as a top sheet, a back sheet, and an absorbent core positioned between the top sheet and the back sheet. The top sheet is generally permeable to fluids and is configured to receive fluids excreted from the body and direct them toward the capture system, distribution system, and/or absorbent core. One key characteristic of the top sheet is its ability to reduce fluid buildup on the top sheet before it can be absorbed by the absorbent material. The above and other features and advantages of this disclosure, as well as the ways in which they are realized, will become clearer and the disclosure itself will be better understood by referring to the following descriptions of embodiments of this disclosure in conjunction with the accompanying drawings. This is a schematic diagram of a top sheet having a flat first layer according to the present invention. This is another schematic diagram of a top sheet having a flat first layer according to the present invention. This is a schematic diagram of a top sheet having a three-dimensional first layer according to the present invention. This is another schematic diagram of a top sheet having a three-dimensional first layer according to the present invention. This is a schematic diagram of a top sheet having a first layer and a second layer according to the present invention. This is a schematic diagram of a top sheet having a first layer and a second layer according to the present invention. This is a schematic diagram of a top sheet having a three-dimensional first layer and a flat second layer according to the present invention. This is a schematic diagram of a three-dimensional top sheet having a first layer and a flat second layer according to the present invention. This is a schematic example of a first exemplary process for forming the top sheet of the present disclosure. This diagram shows the interlocking engagement of a portion of the first roll and the second roll according to the present disclosure. This is a diagram of a portion of the first roll as disclosed herein. This is a diagram of a portion of the second roll as disclosed herein. This is a schematic example of a second exemplary process for forming the top sheet of the present disclosure. This is a top view of an exemplary absorbent article in the form of a diaper, which may include a top sheet of the present invention, with several layers partially removed. Figure 12 is a cross-sectional view of a diaper. This is a top view of an exemplary absorbent article in the form of a diaper, which may include a top sheet of the present invention having a region substantially free of absorbent material. This is a cross-sectional view of the article shown in Figure 14. This is a cross-sectional view of an article cut at the same point as in Figure 15, where a channel is formed in the core as a result of the diaper being filled with fluid. This is a micrograph illustrating an exemplary water droplet on a fiber for the contact angle testing method disclosed herein. Definition of Terms In the present invention, the term “absorbent article” refers to a disposable product, such as a diaper, pants, or sanitary napkin, that is positioned in direct contact with or in close proximity to the wearer’s body to absorb and contain various liquid excrements excreted from the body. Typically, these absorbent articles include a top sheet, a back sheet, and an absorbent core, and optionally a trapping layer and/or a distribution layer and other components, the absorbent core usually positioned between the back sheet and the trapping system or top sheet. The absorbent article of the present invention may be a diaper or pants. As used herein, the term "diaper" refers to an absorbent article intended to be worn by a wearer around the lower torso to absorb and contain liquid excretion from the body. Diapers may be worn by children (e.g., infants or toddlers) or adults. Diapers may be provided with fastening members. As used herein, the term “pants” refers to an absorbent article designed for a child or adult wearer, having fixed edges, a waist opening, and leg openings. The pants are positioned appropriately on the wearer by inserting the wearer’s legs into a pair of leg openings and sliding the pants-type abso