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EP-4046612-B1 - DISPOSABLE WEARABLE ARTICLE

EP4046612B1EP 4046612 B1EP4046612 B1EP 4046612B1EP-4046612-B1

Inventors

  • NAKAMURA, WATARU

Dates

Publication Date
20260513
Application Date
20201118

Claims (5)

  1. A disposable wearing article comprising a top sheet (30) including a skin-contacting region which is in contact with skin of a wearer, wherein the top sheet (30) is formed of a perforated (14) nonwoven fabric having a hole (14)-arranging area in which holes (14) penetrating the perforated nonwoven fabric from a front surface thereof to a back surface thereof are arranged in a predetermined pattern, the skin-contacting region has a liquid-containing area (32) containing a hydrophilic skin care liquid, the hole (14) -arranging area, and an overlapping area (33) in which the liquid-containing area (32) and the hole (14)-arranging area are overlapped each other, the top sheet (30) is, at least at the entire hole (14)-arranging area of the top sheet, bonded to a back surface side member located at a back surface side of the top sheet (30) with a hydrophobic hot melt adhesive (31), and wherein in the pattern, rows of the holes (14) aligned at intervals in a front-back direction (LD) are arranged at intervals in a width direction (WD), the skin care liquid is applied in a stripe state, an application width (32W) of the skin care liquid is twice or less of a maximum value of a center-to-center interval (14d) of two rows of the holes (14) adjacent to each other in the width direction (WD), and an application interval (32X) of the skin care liquid is twice or more of the maximum value of the center-to-center interval (14d) of the two rows of the holes (14) adjacent to each other in the width direction (WD). •
  2. The disposable wearing article according to claim 1, wherein the perforated (14) nonwoven fabric has a fineness of 1 to 5 dtex and a basis weight of 10 to 30 g/m 2 , the hydrophilic skin care liquid is a moisturizing agent containing glycerin as a main component, the liquid-containing area (32) has a portion in which 5 to 15 g/m 2 of the hydrophilic skin care liquid per unit area is contained, and an application amount of the hydrophobic hot melt adhesive (31) is 0.1 to 10 g/m 2 .
  3. The disposable wearing article according to claim 1 or 2, wherein a maximum dimension of the hole (14) is 0.5 to 2 mm and an area rate of the holes (14) in the hole (14)-arranging area is 0.1 to 10%.
  4. The disposable wearing article according to any one of claims 1 to 3, wherein in the pattern, groups (90) of the holes (14) arranged in a single-wavy line or a chained line continuous in a front-back direction (LD) are arranged at intervals in a width direction (WD), with two of the groups (90) adjacent to each other in the width direction (WD) being arranged in a same phase or different phases in the front-back direction (LD), the skin care liquid is applied in a stripe state, an application width (32W) of the skin care liquid is one-third or less of a width (94W) of a unit arrangement portion (94) in a group (90) of the holes (14), and an application interval (32X) of the skin care liquid is one-third or more of the width (94W) of the unit arrangement portion (94) in a group (90) of the holes (14).
  5. The disposable wearing article according to claim 4, wherein the pattern is a Moroccan pattern in which groups (90) of the holes (14) arranged in the front-back direction (LD) in a single-wavy line (92) are arranged at intervals in the width direction (WD), with two of the groups (90) adjacent to each other in the width direction (WD) being arranged in phases opposite to each other, and virtual lines each connecting the holes (14) show a Moroccan pattern.

Description

Technical Field The present invention relates to a disposable wearing article provided with a top sheet formed of a perforated nonwoven fabric. Background Art In many disposable wearing articles such as disposable diapers and sanitary napkins, in order to obtain a cloth-like appearance and touch, a nonwoven fabric is used as a top sheet. As the nonwoven fabric, an imperforated nonwoven fabric is used which has no holes other than interfiber spaces, and in addition, a perforated nonwoven fabric is also used which is provided with many holes penetrating the front surface of the perforated nonwoven fabric and the back surface thereof (See Patent Literature 1). Further, since the perforated nonwoven fabric can also be expected to impart functional beauty in improving air permeability and liquid permeability to the disposable wearing article, it is common to arrange the holes in a good-looking pattern in the fabric. For this reason, the visibility of the pattern of the holes (which means most of the holes is visible such that the whole pattern can be identified) is very important (as the visual effect). Accordingly, it is needless to say that the visibility of the individual holes is important. Meanwhile, in recent years, due to growing needs for high-class products, there are articles in each of which a skin care agent is contained in a top sheet (See Patent Literatures 1 to 4) However, when a skin care agent is contained in a top sheet formed of a perforated nonwoven fabric, a problem is caused that the visibility of the holes of the nonwoven fabric is partly deteriorated. Citation List Patent Literature Patent Literature 1: JP 2017-217325 APatent Literature 2: JP 2010-526630 APatent Literature 3: JP 2002-509457 APatent Literature 4: JP 2019-170534 APatent Literature 5: JP 2010-075733A Summary of Invention Technical Problem Therefore, a main object of the present invention is, for example, to inhibit, in a disposable wearing article provided with a top sheet formed of a perforated nonwoven fabric containing a skin care agent, the deterioration of visibility of the holes of the perforated nonwoven fabric. Solution to Problem The present inventor has obtained findings through research and development aiming for use of perforated nonwoven fabric containing a skin care agent as the top sheet of disposable wearing articles. That is, the visibility of holes in perforated nonwoven fabric may vary partly because of change in shape or orientation of the holes. For example, the visibility of holes is lowered when the holes are crushed with force applied to the perforated nonwoven fabric. Naturally, the visibility of holes is higher when the angle of line of sight of a user is closer to the right angle with respect to the face of the perforated nonwoven fabric having the holes. However, when the perforated nonwoven fabric is creased or otherwise to cause the angle of the line of sight of a user to become closer to 0 degrees with respect to part of the nonwoven fabric having the holes, the holes are apparently crushed to lower their visibility. Lowering of visibility at a larger number of holes may lead to lowered visibility of the overall pattern of the holes, even if aesthetically superior, resulting in impaired aesthetic appearance. As far as the disposable wearing articles, which are flat products, are deformed so as to fit on the body surface, creasing of the top sheet of the article cannot be avoided completely. However, collapsing of the holes in the top sheet or unnecessary creasing of the top sheet may be avoided by fixing the entire top sheet to the member underside thereof. Usually, the top sheet is bonded to the member underside thereof by means of a hydrophobic hot melt adhesive applied to the under face of the top sheet. However, if the top sheet contains an oil-soluble skin care liquid, the bonding by means of the hydrophobic hot melt adhesive is disturbed, so that the top sheet may become partially unbonded from the member underside thereof, resulting in collapse of the holes in the unbonded part of the top sheet and unnecessary creasing of the top sheet, which lowers visibility of the holes. A disposable wearing article to be discussed below is attained based on the above findings. <First Aspect> A disposable wearing article including a top sheet including a skin-contacting region which is in contact with skin of a wearer, whereinthe top sheet is formed of a perforated nonwoven fabric having a hole-arranging area in which holes penetrating the perforated nonwoven fabric from front to back are arranged in a predetermined pattern,the skin-contacting region has a liquid-containing area containing a hydrophilic skin care liquid, the hole-arranging area, and an overlapping area in which the liquid-containing area and the hole-arranging area are overlapped each other, andthe top sheet is, at least at the entire hole-arranging area of the top sheet, bonded to a back surface side member located at a back surface