Absorbent article with strong and weak bonded portions

Patent metadata

Field	Value
Publication number	US-11160691-B2
Application number	US-201716088879-A
Country	US
Kind code	B2
Filing date	Feb 23, 2017
Priority date	Mar 30, 2016
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

An absorbent article includes an absorber including cells, each of which is surrounded by bonded portions of a front surface side sheet and a back surface side sheet and in each of which the front surface side sheet and the back surface side seat are not bonded, and including superabsorbent polymer particles contained in each of the cells. The bonded portions are arranged in dotted line shapes according to a pattern in which same-sized octagonal portions having all interior angles of 135°, and having two pairs of opposite sides whose facing directions are mutually orthogonal are equal in length, and diamond-shaped portions each having equal length of all sides and being formed in portions among the octagonal portions, are arranged without any space in the front-back direction (LD) or the width direction (WD).

First claim

The invention claimed is:

1. An absorbent article comprising an absorber having a front surface side and a back surface side, the absorber including:
a front surface side sheet;
a back surface side sheet disposed on the back surface side of the front surface side sheet;
a plurality of cells each of which is surrounded by bonded portions of the front surface side sheet and the back surface side sheet and inside each of which the front surface side sheet and the back surface side sheet are not bonded; and
particulate materials which include superabsorbent polymer particles and which are contained in each of the cells,
wherein the bonded portions are provided in continuous line shapes or dotted line shapes so as to form a pattern of same-sized octagons arranged without space in both a front-back direction and a width direction, wherein the width direction is orthogonal to the front-back direction;
wherein the pattern of same-sized octagons are arranged such that all interior angles of the octagons are 135°, and lengths of two pairs of opposite sides of the octagons whose facing directions are mutually orthogonal are equal;
wherein the pattern of same-sized octagons define diamond-shaped cells between the plurality of cells, and lengths of all sides of each diamond-shaped cell being equal;
wherein the bonded portions comprise strong bonded portions and weak bonded portions, and wherein at least two continuous sides in each of the octagons are weak bonded portions which can be peeled off due to a swelling force of the superabsorbent polymer particles in the cells adjacent to the bonded portions;
wherein strong bonded portions provided in a center portion and side portions on either side of the center portion along the width direction are longitudinal strong-bond lines, each of the longitudinal strong-bond lines continuously extending in the front-back direction;
wherein strong bonded portions provided in a zigzag shape bending left and right between the longitudinal-strong-bond line in the center portion and each of the longitudinal-strong-bond lines in the side portions are lateral-strong-bond lines; and
wherein the longitudinal-strong-bond lines and the lateral-strong-bond lines define maximum enlargement sections, each of the maximum enlargement sections having a substantially triangular shape.

2. The absorbent article according to claim 1 ,
wherein the diamond-shaped cells do not contain a superabsorbent polymer particle or contain a smaller amount of the superabsorbent polymer particles per unit area than the plurality of cells.

3. The absorbent article according to claim 1 ,
wherein the weak bonded portions comprise first bonded portions and second bonded portions, the first bonded portions positioned on sides parallel to the front-back direction and the width direction having lower bonding strength than the second bonded portions positioned on sides parallel to an oblique direction that is situated at an angle relative to the front-back direction and the width direction.

4. The absorbent article according to claim 1 ,
wherein the weak bonded portions comprise first bonded portions and second bonded portions, the first bonded portions positioned on sides parallel to the front-back direction and the width direction having higher bonding strength than the second bonded portions positioned on sides parallel to an oblique direction that is situated at an angle relative to the front-back direction and the width direction.

5. The absorbent article according to claim 1 , wherein:
each maximum enlargement section comprises three or more cells and four or more diamond-shaped cells that are arranged respectively without any space in the front-back direction and the width direction wherein the three or more cells and the four or more diamond-shaped cells are surrounded by strong bonded portions which are not peeled off against the swelling force of the superabsorbent polymer particles in adjacent cells; and
wherein the bonded portions positioned inside the strong bonded portions in the maximum enlargement sections are the weak bonded portions.

6. The absorbent article according to claim 5 ,
wherein the bonded portions are portions where the front surface side sheet and the back surface side sheet are welded;
wherein the weak bonded portions and the strong bonded portions are provided in dotted line patterns;
wherein a line width of the weak bonded portions is narrower than a line width of the strong bonded portions; and
wherein a point interval of the weak bonded portions is wider than a point interval of the strong bonded portions.

7. The absorbent article according to claim 1 ,
wherein bonded portions are not provided at vertex positions where sides of the cells on which the weak bonded portions are positioned intersect with each other.

8. The absorbent article according to claim 1 ,
wherein at least cells provided at positions through which front and back ends of the absorber pass and cells in the side portions in an intermediate portion of the front-back direction of the absorber are empty cells which do not contain a superabsorbent polymer particle or which contain a smaller amount of the superabsorbent polymer particles per unit area than other cells.

9. The absorbent article according to claim 2 ,
wherein the weak bonded portions comprise first bonded portions and second bonded portions, the first bonded portions positioned on sides parallel to the front-back direction and the width direction having lower bonding strength than the second bonded portions positioned on sides parallel to an oblique direction that is situated at an angle relative to the front-back direction and the width direction.

10. The absorbent article according to claim 2 ,
wherein the weak bonded portions comprise first bonded portions and second bonded portions, the first bonded portions positioned on sides parallel to the front-back direction and the width direction having higher bonding strength than the second bonded portions positioned on sides parallel to an oblique direction that is situated at an angle relative to the front-back direction and the width direction.

11. The absorbent article according to claim 2 , wherein:
each maximum enlargement section comprises three or more cells and four or more diamond-shaped cells that are arranged respectively without any space in the front-back direction and the width direction, wherein the three or more cells and the four or more diamond-shaped cells are surrounded by strong bonded portions which are not peeled off against the swelling force of the superabsorbent polymer particles in adjacent cells; and
wherein the bonded portions positioned inside the strong bonded portions in the maximum enlargement sections are the weak bonded portions.

12. The absorbent article according to claim 1 ,
wherein the bonded portions are portions where the front surface side sheet and the back surface side sheet are welded;
wherein the weak bonded portions and the strong bonded portions are provided in dotted line patterns;
wherein a line width of the weak bonded portions is narrower than a line width of the strong bonded portions; and
wherein a point interval of the weak bonded portions is wider than a point interval of the strong bonded portions.

Assignees

• Daio Seishi Kk

Inventors

• Manabe Sadanao
• Ochi Ryoichi
• Mori Yosuke
• Ono Yohei

Classifications

• A61F13/5323 Primary

  having absorbent material located in discrete regions, e.g. pockets · CPC title

• A61F13/533

  having discontinuous areas of compression · CPC title

• A61F13/532

  inhomogeneous in the plane of the pad · CPC title

• A61F2013/15463

  Absorbency · CPC title

• A61F2013/530299

  being hydrophilic fibres · CPC title