US 12,103,217 B2Granted

Stretchable sheet manufacturing method

AssigneeZuiko Corporation

InventorsHideyuki Nakamura, Miwa Koshijima

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Abstract

In the present invention, an elastic resin material having a thermoplastic elastic resin is extruded into a sheet shape on a die and made to have a thickness that varies along the width direction, and then is cooled, to a temperature in which the elastic resin material elastically deforms, to form a sheet body that varies in thickness along the width direction, and a stretchable sheet is formed by laminating and joining base sheets. The sheet body includes at least two first and second regions adjacent to each other in the width direction, and the thicknesses of the second regions are greater than that of the first regions. In a wearable article, the stretchable sheet is disposed so that at least a portion of the second regions is closer to an opening around a body or an opening around a leg of the disposable wearable article than the first regions.

Claims4

Dependent claims

A stretchable sheet manufacturing method, comprising:

heat-melting an elastic resin material having a main component of a thermoplastic elastic resin,
forming the heat-melted elastic resin material into a sheet shape having a thickness that varies along a width direction by discharging the heat-melted elastic resin material in a sheet form from a lip of a die, the lip of the die being configured to extend in the width direction,
cooling the heat-melted elastic resin material formed into the sheet shape to a temperature range in which the heat-melted elastic resin material elastically deforms, to form a sheet body that varies in thickness along the width direction, and
laminating and joining a base sheet to at least one of opposing main surfaces of the sheet body,
wherein the heat-melted elastic resin material formed into the sheet shape before being cooled consists, in the width direction, of a single center region having an equal thickness and two side regions having thicknesses greater than that of the center region, to thereby have elasticity different in the width direction.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/967,025Filed 14 Dec 2018
Priority: JP 2018-0196626 Feb 2018
Published: US 2021/0031428 A14 Feb 2021
Granted: 1 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification37 codes

B29C 48/154
Incorporating preformed parts or layers, e.g. extrusion moulding around inserts: coating solid articles, i.e. non-hollow articles
B29C 48/305
Extrusion nozzles or dies: having a wide opening, e.g. for forming sheets
A61F 13/15682
Wrapping formed fibrous webs or pads, e.g. the pads being formed by uniting pad pieces cut from fibrous webs: by folding webs, moving in their…
A61F 13/15699
Apparatus or processes for manufacturing: forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or…