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Patents

Elastic Composite Sheet Manufacturing Method:

U.S. Patent No. 11,540,954

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By: Tara Olivo

Associate Editor at Nonwovens Industry, Rodman Media

Hideyuki Nakamura, Settu, Japan; Yukihiko Fujita, Settu, Japan; and Miwa Koshijima, Settu, Japan.
Assigned to Zuiko Corporation, Settu, Japan.

Filed: 12/17/18
Issued: 1/3/23

An elastic composite sheet manufacturing method comprising: a first step of heating and melting an elastic resin material having a thermoplastic elastic resin as a main component; a second step of forming a film-shape or a linear-shape intermediate product by discharging the melted elastic resin material in a film or a linear shape; a third step of extending the intermediate product at a temperature higher than a temperature region at which the elastic resin material elastically deforms, until a thickness or width of the film-shape intermediate product or a thickness of the linear-shape intermediate product assumes a prescribed value; a fourth step of forming a film-shape or a linear-shape elastic member by contacting the intermediate product with a cooling member, so as to cool the intermediate product to a temperature region at which the elastic resin material elastically deforms and hardening the intermediate product; a fifth step of stretching the elastic member to a prescribed stretching ratio; and a sixth step of laminating the stretched elastic member on a first base material sheet and bonding the elastic member to the first base material sheet, wherein at the third and fourth steps, by providing a plurality of cooling members having different temperature conditions so that the intermediate product passes the cooling members successively, the intermediate product is cooled in a plurality of steps, and wherein at the third and fourth steps, a condition for cooling the intermediate product is made to vary along a width direction of the film-shape intermediate product or along a direction in which a plurality of the linear-shape intermediate products are arranged.

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