Absorbent article and method for producing same
AssigneeDaio Paper Corporation
InventorTakashi Matsumura
Life of this patent
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Abstract
An absorbent article having an elastic film stretchable region in which a stretch rate changes depending on the part, and a method of manufacturing the same. The above problem is solved when a stretchable region being stretchable at least in a width direction is included in a lower-torso region having a waist portion of an outer body of a front body and an outer body of a back body, and in the stretchable region, in a state in which an elastic film is stretched in a stretching and contracting direction at a stretch rate continuously increasing from a crotch side toward a waist opening side, a first sheet layer and a second sheet layer are joined.
Claims15
An absorbent article comprising
- a stretchable region having an elastic film between a first sheet layer made of a nonwoven fabric and a second sheet layer made of a nonwoven fabric, wherein
- in the stretchable region, the first sheet layer and the second sheet layer are joined via through holes formed in the elastic film at bond portions arranged at intervals in a first direction and a second direction orthogonal thereto,
- the stretchable region is stretchable in the second direction from one end to another end in the first direction,
- in a stretched state of the stretchable region, as the elastic film is stretched between the bond portions, a distance between the bond portions is widened, and the elastic film is configured to stretch up to a completely spread state, such that any wrinkles forming between the first sheet layer and the second sheet layer are removed as the stretchable region is stretched, and
- in the stretchable region, an elongation at an elastic limit in the second direction at each position in the first direction continuously changes as the position in the first direction continuously changes.
A method of manufacturing an absorbent article including a stretchable region having an elastic film between a first sheet layer made of a nonwoven fabric and a second sheet layer made of a nonwoven fabric, wherein
- in the stretchable region, the first sheet layer and the second sheet layer are joined via through holes formed in the elastic film at bond portions arranged at intervals in a first direction and a second direction orthogonal thereto,
- the stretchable region is stretchable in the second direction from one end to another end in the first direction,
- in the stretched state of the stretchable region, as the elastic film is stretched between the bond portions, a distance between the bond portions is widened, and the elastic film is configured to stretch up to a completely spread state, such that any wrinkles forming between the first sheet layer and the second sheet layer are removed as the stretchable region is stretched,
- in forming the stretchable region, in a state in which the elastic film is interposed between the first sheet layer and the second sheet layer while being stretched in a machine direction,
- the elastic film is melted to form the through holes at a plurality of positions arranged at intervals in the machine direction and a cross direction orthogonal thereto, and the first sheet layer and the second sheet layer are joined via the through holes, and
- in stretching the elastic film in the machine direction, a stretch rate of the elastic film in the machine direction at each position in the cross direction continuously changes as the position in the cross direction continuously changes.
An underpants-type disposable diaper comprising:
- a first outer body included in a front body having front side portions and a second outer body included in a back body having back side portions;
- wherein each of the front side portions is joined to one of the back side portions to thereby define side seal portions, a waist opening side, a crotch side, and an internal surface of the underpants-type disposable diaper;
- an inner body includes an absorber and is fixed to the internal surface;
- at least one of the first outer body and the second outer body has a stretchable region comprising an elastic film between a first sheet layer made of a nonwoven fabric and a second sheet layer made of a nonwoven fabric;
- the first sheet layer and the second sheet layer are joined via through holes formed in the elastic film at bond portions arranged at intervals in a width direction and a front-back direction orthogonal thereto;
- in stretching the elastic film in the width direction while being stretched, elasticity of the stretchable region continuously changes in the front-back direction from the crotch side to the waist opening side so that the elastic film is extended in the width direction from the crotch side to the waist opening side;
- and
- in the stretched state, as the elastic film is stretched between the bond portions, a distance between the bond portions is widened, and the elastic film is configured to stretch up to a completely spread state, such that any wrinkles forming between the first sheet layer and the second sheet layer are removed as the stretchable region is stretched.
Dependencies are inferred from the claim text.