Method of making a padded item

• US 4,025,372 A
• Filed: 09/09/1975
• Issued: 05/24/1977
• Est. Priority Date: 01/31/1973
• Status: Expired due to Term

• Current Assignee: Storey Brothers and Company Limited
• Original Assignee: Storey Brothers and Company Limited
• Inventors: Fenton, Sidney Desmond
• Primary Examiner(s): Whitby, Edward G.
• Application Number:
  US05/611,741
• Time in Patent Office: 623 Days
• Field of Search: 264/45.5, 264/45.6, 264/46.6, 264/46.3, 264/321, 264/DIG. 78, 156/79, 156/245, 156/246, 156/229, 428/311, 428/310, 428/315
• US Class Current: 156/79
• CPC Class Codes: A47C 7/18 having foamed material included in cushioning part foamed material mattresses A47C27/14
• CPC Class Codes: B29C 44/146 Shaping the lining before foaming
• CPC Class Codes: B32B 2266/0278 Polyurethane
• CPC Class Codes: B32B 2266/08 Closed cell foam
• CPC Class Codes: B32B 2305/022 Foam
• CPC Class Codes: B32B 2309/02 Temperature
• CPC Class Codes: B32B 2309/105 Thickness
• CPC Class Codes: B32B 27/065 of foam
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/22 using plasticisers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/40 comprising polyurethanes
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/026 Knitted fabric
• CPC Class Codes: B32B 5/04 characterised by a layer being specifically extensible by reason of its structure or arrangement , e.g. by reason of the chemical nature of the fibres or filaments
• CPC Class Codes: B32B 5/20 foamed in situ
• CPC Class Codes: Y10S 264/78 Processes of molding using vacuum
• CPC Class Codes: Y10T 428/249984 Adhesive or bonding component contains voids

Abstract

This invention relates to a method of making fabric-faced upholstered items. The items are made by vacuum forming under heat a laminate of a cast highly plasticized vinyl chloride homopolymer or copolymer sheet and a readily extensible fabric, and the resulting shaped cover is filled with a foam which is foamed in situ, the foam bonding to the thermoplastics sheet of the laminate and holding the laminate in shape. The laminate must have an extensibility in two directions at right angles of at least 25% under a load of 51b per 2 inch wide strip when subjected to loads of 51b applied at right angles to one another to the edges of a 2 inch side square of the fabric, and be capable of increasing its surface area by at least 50%. The fabric can have this high degree of extensibility and still be suitable as a cover because the laminate is bonded to the foam filling and so held to shape.

Claims

1. A method of making a resilient fabric-faced upholstered item comprising the steps of:

(a) shaping a laminate of a cast plasticized vinyl chloride homopolymer or copolymer sheet and a fabric by vacuum forming to the desired shape of a cover for said item by heating said vinyl chloride homo-polymer or copolymer sheet to a temperature of at least 150°

C., said fabric being a knitted fabric having an extensibility in two directions at right angles of at least 25% under a load of 5 lb per 2 inch wide strip and being capable of increasing its surface area by at least 50% when subjected to two loads of 5 lb applied at right angles to one another to the edges of a 2 inch square of said fabric, and said vinyl chloride homopolymer or copolymer sheet containing at least 35 parts of plasticizer per 100 parts of polymer;

(b) holding said cover to shape in a mould with said fabric outermost and said cast vinyl chloride homopolymer or copolymer sheet innermost;

(c) placing within said cover the precursors of a resilient foam; and

(d) allowing said precursors to foam and fill said cover to provide a resilient foam filling, said foam becoming bonded to said vinyl chloride homopolymer or copolymer sheet of said laminate cover and retaining said cover in the required shape of said upholstered item.

2. A method according to claim 1 in which said resilient foam is a polyurethane foam.

3. A method according to claim 1 in which the said vinyl chloride homopolymer or copolymer sheet contains 35 to 50 parts of plasticizer per 100 parts of polymer.

4. A method according to claim 1 in which said vinyl chloride homopolymer or copolymer sheet is heated to 180°

C.

5. The method of claim 1 wherein said polymer sheet is from 20 to 2,000 microns in thickness.

6. The method of claim 1 wherein said foam contains closed cells.

7. The method of claim 1 wherein said extensibility is at least 35%.

8. The method of claim 1 wherein said fabric is capable of increasing its surface area by at least 100%.

9. The method of claim 1 wherein said fabric is a loop knitted fabric.

10. The method of claim 1 wherein the foam has a density of from 40 to 56 kg/m³.