Elastic permeable material and method of making same

• US 5,322,730 A
• Filed: 01/15/1993
• Issued: 06/21/1994
• Est. Priority Date: 01/15/1993
• Status: Expired due to Fees

• Current Assignee: An SHUN Environmental Technology Company Limited
• Original Assignee: Jer-Wen Ou
• Inventors: Ou, Jer-Wen
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): COPENHEAVER, BLAINE R
• Application Number:
  US08/005,388
• Time in Patent Office: 522 Days
• Field of Search: 428/306.6, 428/308.4, 428/316.6, 428/314.4, 428/71, 428/322.7, 428/320.2, 521/54, 264/46.4, 264/46.6, 264/139, 264/321
• US Class Current: 428/316.6
• CPC Class Codes: B29C 2793/00 Shaping techniques involving a cutting or machining operation
• CPC Class Codes: B29C 2793/0027 Cutting off
• CPC Class Codes: B29C 44/0461 by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
• CPC Class Codes: B29C 44/08 using several expanding or moulding steps
• CPC Class Codes: B29C 44/56 After-treatment of articles, e.g. for altering the shape
• CPC Class Codes: B32B 2331/04 Polymers of vinyl acetate, e.g. PVA
• CPC Class Codes: B32B 2437/02 Gloves, shoes
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: Y10T 428/233 Foamed or expanded material encased
• CPC Class Codes: Y10T 428/249976 Voids specified as closed
• CPC Class Codes: Y10T 428/249981 Plural void-containing components
• CPC Class Codes: Y10T 428/249994 Composite having a component wherein a constituent is liquid or is contained within preformed walls [e.g., impregnant-filled, previously void containing component, etc.]
• CPC Class Codes: Y10T 428/249999 Differentially filled foam, filled plural layers, or filled layer with coat of filling material

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.

Claims

1. An elastic permeable material comprising:

a basic structure, which is of a flat board-like construction and made of a foam material having therein a plurality of close cells, and which has a main framework provided with a network of through holes; and

a permeable material of a foam material having therein a plurality of connected open cells, said through holes of said basic structure being filled with said permeable material so as to form a permeable framework.

2. The elastic permeable material according to claim 1 wherein each of said through holes of said basic structure is trapezoidal in shape.

3. The elastic permeable material according to claim 1 wherein each of said through holes is filled with said permeable material such that said permeable material extends slightly beyond a boundary defining a top opening of each of said through holes so as to form a bulge on a surface of said basic structure.

4. The elastic permeable material according to claim 2 wherein each of said through holes is filled with said permeable material such that said permeable material extends slightly beyond a boundary defining a top opening of each of said through, so as to form a bulge on a surface of said basic structure.

5. The elastic permeable material according to claim 1 further comprising an outer covering made of a durable and permeable material.

6. The elastic permeable material according to claim 2 wherein each of said through holes is a top opening which is covered with an outer covering made of a permeable material.

7. The elastic permeable material according to claim 3 wherein said surface of said basic structure is adhered thereto an outer covering of a permeable material so as to form a corrugated surface on said basic structure.

8. The elastic permeable material according to claim 1 wherein said basic structure is made of an ethylene vinyl acetate foam material.

9. The elastic permeable material according to claim 1 wherein said permeable material is selected from the group consisting of an emulsified rubber foam body, an emulsified polyvinyl chloride foam body, and a polyurethane foam body.

10. An elastic foam body, comprising a flat foam material having closed cells and a plurality of holes extending therethrough, each of said holes filled with a permeable foam material having open cells.

11. An elastic foam body as recited in claim 10, further comprising an outer covering adhered to said flat foam material.

12. An elastic foam body as recited in claim 11, wherein said permeable foam material having open extends outwardly beyond a plane defined by a surface of said flat foam material.