US-12616621-B2 - Absorbent product

Abstract

An absorbent product includes an adhesive portion arranged on a surface of a back sheet opposite to a wearer side. Longitudinal-side boundary portions are between first and second areas of an absorber, the second area being thinner than the first area. The adhesive portion includes first adhesive elements and second adhesive elements arranged on the back sheet to avoid the longitudinal-side boundary portions. Each of the first adhesive elements extends in one of a longitudinal direction or a width direction in the first area, and the first adhesive elements are aligned in the other of the longitudinal direction or the width direction in the first area. Each of the second adhesive elements extends in one of a longitudinal direction or a width direction in the second area, and the second adhesive elements are aligned in the other of the longitudinal direction or the width direction in the second area.

Inventors

• Yuki Takahashi
• Shingo Takeda

Assignees

• LIVEDO CORPORATION

Dates

Publication Date

20260505

Application Date

20211007

Priority Date

20210412

Claims (5)

1. 1 . An absorbent product for receiving body waste from a wearer, the absorbent product comprising: a top sheet that is liquid-permeable; a back sheet that is liquid-repellent or liquid-impermeable; an absorber arranged between the top sheet and the back sheet; and an adhesive portion arranged on a surface of the back sheet on an opposite side to a wearer side, wherein: the absorber includes a first area located in a central portion in a longitudinal direction; the absorber includes a second area that is thinner than the first area and contiguous to the first area on both sides in the longitudinal direction of the first area; the absorber includes longitudinal-side boundary portions between the first area and the second area on both sides in the longitudinal direction of the first area; each of the longitudinal-side boundary portions extends in a width direction; the adhesive portion includes first adhesive elements and second adhesive elements arranged on the back sheet to avoid the longitudinal-side boundary portions; each of the first adhesive elements extends in one of a longitudinal direction in the first area or a width direction in the first area, and the first adhesive elements are aligned in the other of the longitudinal direction in the first area or the width direction in the first area; each of the second adhesive elements extends in one of a longitudinal direction in the second area or a width direction in the second area, and the second adhesive elements are aligned in the other of the longitudinal direction in the second area or the width direction in the second area; the second area is contiguous to the first area on both sides in the width direction of the first area; the absorber includes lateral-side boundary portions between the first area and the second area on both sides in the width direction of the first area; each of the lateral-side boundary portions extends in the longitudinal direction; the first adhesive elements and the second adhesive elements are arranged on the back sheet to avoid the lateral-side boundary portions; and a shortest distance in the width direction between each of the lateral-side boundary portions and the first adhesive elements is greater than or equal to 1 mm and less than or equal to 7.5 mm.
2. 2 . The absorbent product according to claim 1 , wherein: the absorber includes a first absorbent sheet configured to secure a particulate or fibrous high absorbent material to a main surface of a sheet support member with an adhesive; the absorber includes a second absorbent sheet that is longer than the first absorbent sheet in the longitudinal direction and arranged between the first absorbent sheet and either of the back sheet or the top sheet; the first area of the absorber is an area where the first absorbent sheet and the second absorbent sheet overlap each other in a thickness direction; and the second area of the absorber is an area of the second absorbent sheet that extends outward from the first absorbent sheet.
3. 3 . The absorbent product according to claim 1 , wherein: an interval of adhesive elements that are located between the longitudinal-side boundary portions, among the first adhesive elements and the second adhesive elements, are greater than an interval of adhesive elements that are located outward of the longitudinal-side boundary portions in the longitudinal direction, among the first adhesive elements and the second adhesive elements.
4. 4 . The absorbent product according to claim 1 , wherein; the absorbent product is configured to be folded along a folding line that extends in the width direction; and the first adhesive elements and the second adhesive elements are arranged on the back sheet to avoid the folding line.
5. 5 . The absorbent product according to claim 4 , wherein: a shortest distance in the longitudinal direction between the folding line and the first adhesive elements is greater than a shortest distance in the longitudinal direction between each of the longitudinal-side boundary portions and the first adhesive elements.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of priority to Japanese Patent Application No. 2021-067028 filed on Apr. 12, 2021, the entire disclosure of which is incorporated herein by reference. The present invention relates to an absorbent product for receiving body waste from the wearer. BACKGROUND ART Conventionally, absorbent products have been used, such as absorbent pads for light urinary incontinence that are secured to the inner sides of products such as underclothes or disposal diapers. Such an absorbent product includes a back sheet provided generally with an adhesive portion or the like for securing the absorbent product to the inner side of a product such as underclothes or a disposable diaper. For example, the panty liner disclosed in Japanese Patent Application Publication No. 2010-075315 (hereinafter, “JP 2010-075315”) includes a back sheet provided with, as anti-displacement measures, a rectangular adhesive portion that approximately overlaps the entire absorber formed of pulp fibers or any like material. The absorbent product disclosed in Japanese Patent Application Publication No. 2018-15463 (hereinafter, “JP 2018-15463”) includes a strip adhesive portion that extends in either the longitudinal or width direction on a back sheet. The panty liner disclosed in Japanese Patent Application Publication No. 2006-247088 (hereinafter, “JP 2006-247088”) reduces the formation of robust creases by arranging a strip adhesive portion that extends in either the longitudinal or width direction on a back sheet to avoid overlaps with folding lines in packaging in which the panty liner before use is folded. Those adhesive portions are formed by applying an adhesive or the like onto the back sheet during production of absorbent products. By the way, if the adhesive portion is provided to approximately overlap the entire absorber as in JP 2010-075315, the absorbent product may have an excessively high strength to secure itself to a product such as underclothes or a disposable diaper (such a product is hereinafter also referred to as an “exterior product”) and accordingly may become difficult to detach from the exterior product. In the absorbent product disclosed in JP 2018-15463, a relatively long slender strip of adhesive portion is arranged spanning both edges of the absorber. Thus, when the adhesive portion is formed by applying an adhesive or the like on the back sheet, twisting of the adhesive portion may occur. If the adhesive portion becomes twisted, it may become difficult to favorably secure the absorbent product to the inner side of an exterior product. In JP 2006-247088, no consideration is given to the relationship between the strip adhesive portion and the edges of the absorber. Moreover, absorbent products as described above may also use an absorber having a two-layer structure. If the first layer and the second layer are different in size in plan view, a difference in level also occurs at the boundary portion between the first and second layers. JP 2010-075315, JP 2018-15463, and JP 2006-247088 give no consideration to the influence of such a small difference in level on the aforementioned twisting of the adhesive portion. SUMMARY OF THE INVENTION The present invention relates to an absorbent product for receiving body wastes from the wearer, and it is an object of the present invention to reduce the occurrence of twisting of adhesive elements. An absorbent product according to one preferable embodiment of the present invention includes a liquid-permeable top sheet, a liquid-repellent or liquid-impermeable back sheet, an absorber arranged between the top sheet and the back sheet, and an adhesive portion provided on a surface of the back sheet on an opposite side to a wearer side. The absorber includes a first area located in a central portion in a longitudinal direction, a second area that is thinner than the first area and contiguous to the first area on both sides in the longitudinal direction of the first area, and a pair of longitudinal-side boundary portions that are boundary portions between the first area and the second area on both sides in the longitudinal direction of the first area. Each of the pair of longitudinal-side boundary portions extends in a width direction. The adhesive portion includes a plurality of adhesive elements arranged on the back sheet to avoid the pair of longitudinal-side boundary portions. The plurality of adhesive elements include a plurality of first adhesive elements each extending in either of the longitudinal direction and the width direction and aligned in the other of the longitudinal direction and the width direction in the first area, and a plurality of second adhesive elements each extending in either of the longitudinal direction and the width direction and aligned in the other of the longitudinal direction and the width direction in the second area. According to the present invention, it is possible to reduce the occur