Elastic permeable material and method of making same
First Claim
1. A method of making an elastic permeable material comprising the steps of:
- (a) providing a flat board-like foam material, which has closed cells and a body provided with a plurality of recesses;
(b) filling said recesses with an emulsified rubber foam body or an emulsified polyvinyl chloride foam body;
(c) sulfurizing said emulsified rubber foam body or said emulsified polyvinyl chloride foam body to form a permeable material having open cells; and
(d) removing a bottom layer of said basic structure so that said recesses become through holes.
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Accused Products
Abstract
An elastic permeable material and method of making same involves a board-like basic structure made of a foam material having therein close cells. The basic structure is provided with a plurality of recesses which are filled with an emulsified foam body having therein open cells. The basic structure is subjected to a heating and then a curing before the top and the bottom layers of the basic structure are peeled off so that the recesses become through holes. The basic structure is used as a main framework while the foam bodies embedded in the through holes form a permeable framework. The elastic permeable material is provided thereon a permeable outer covering adhered thereto. The basic structure is heated under a pressure so as to bring about a reduction in the thickness of the basic structure, thereby resulting in a formation of corrugated surface of the elastic permeable material.
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Citations
13 Claims
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1. A method of making an elastic permeable material comprising the steps of:
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(a) providing a flat board-like foam material, which has closed cells and a body provided with a plurality of recesses; (b) filling said recesses with an emulsified rubber foam body or an emulsified polyvinyl chloride foam body; (c) sulfurizing said emulsified rubber foam body or said emulsified polyvinyl chloride foam body to form a permeable material having open cells; and (d) removing a bottom layer of said basic structure so that said recesses become through holes. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making an elastic permeable material comprising the steps of:
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(a) using an ethylene vinyl acetate material to make by foaming a thick board, which is cleaved to form a board piece which has a predetermined thickness and which is punched to form a basic structure having a plurality of through holes; (b) arranging said basic structure in a mold cavity of a molding tool and then filling said through holes of said basic structure with liquid polyurethane; (c) closing said molding tool, which is then heated under a pressure to cause said polyurethane to foam; and (d) removing from said molding tool an elastic permeable material so made. - View Dependent Claims (8, 9, 10)
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11. A method of making an elastic permeable sheet material comprising the steps of:
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providing a sheet of closed cellular elastic foam material; making holes in said sheet of closed cellular elastic foam material so as to provide recesses therewithin; filling said recesses with a foamable elastomeric composition capable of forming open cell foam; and foaming and solidifying said foamable elastomeric composition to provide an open cell permeable foam within said recesses, wherein said open cell permeable foam extends entirely through said sheet of closed cellular elastic foam. - View Dependent Claims (12, 13)
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Specification