Process for molding a cloth in a hot mold and molding a cloth covered foam filled product

• US 4,264,386 A
• Filed: 03/19/1979
• Issued: 04/28/1981
• Est. Priority Date: 03/19/1979
• Status: Expired due to Term

• Current Assignee: Sears Manufacturing Co.
• Original Assignee: Sears Manufacturing Co.
• Inventors: Sears, I. Weir Jr., Quertain, Raoul
• Primary Examiner(s): Anderson, Philip
• Application Number:
  US06/022,592
• Time in Patent Office: 771 Days
• Field of Search: 264/46.8, 264/46.6, 264/257, 264/322, 428/425, 428/315, 156/79, 156/245
• US Class Current: 156/79
• CPC Class Codes: B29C 51/145 having at least one layer of textile or fibrous material combined with at least one plastics layer
• CPC Class Codes: B29K 2313/00 Use of textile products or fabrics as reinforcement B29K2105/06 takes precedence
• CPC Class Codes: B32B 27/065 of foam
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 5/24 one layer being a fibrous or filamentary layer
• CPC Class Codes: B32B 5/245 another layer next to it being a foam layer

Abstract

A method of molding cloth. A special multi-layer cloth is first preheated and then drawn into a heated mold by means of a vacuum between the cloth and the mold. The cloth includes a fabric layer having a heat-fixable fiber, a polyurethane foam layer and a polyvinyl chloride film layer bonded together. The cloth is preheated to at least the greater of the set temperatures of the fabric layer and the polyvinyl chloride film. The mold is heated to at least the same temperature. After the cloth has conformed to the contours of the mold, the cloth is cooled in the mold. The steps of heating the cloth in the mold and then cooling the cloth sets the stitch of the fabric to the contours of the mold. Polyurethane foam may then be poured into the mold and allowed to expand to form a seat cushion or the like.

Claims

1. A process for molding cloth comprising the steps of:

drawing the cloth into a heated mold, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the temperature of the mold being at least the heat-fixable fiber set temperature;

heating the cloth to at least the heat-fixable fiber set temperature, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth, the process heat-fixing the heat-fixable fiber of the cloth to the shape of the mold.

4. A process as in claim 1, 2 or 3 further comprising the step of preheating the cloth prior to the drawing step.

8. A process as in claim 1, 5 or 7 wherein the elastic composition layer has a low elastic recovery after molding to facilitate the retention of the molded shape of the cloth.

9. The process as in claim 1, 2, 5 or 7 wherein the elastic composition layer includes a flexible foam layer formed of a polymer selected from the group consisting of urethane, vinyl chloride, polyvinyl chloride, polychloroprene and rubber.

10. A process as in claim 1, 5 or 7 wherein the elastic composition layer comprises:

a flexible foam layer bonded to the fabric layer; and

an elastic film bonded to the foam layer.

11. The process as in claim 10 wherein the flexible foam layer is formed from a polymer selected from the group consisting of urethane, vinyl chloride, polyvinyl chloride, polychloroprene and rubber.

12. A process as in claim 1, 5 or 7 wherein the elastic composition layer includes a thermoplastic film layer.

13. A process as in claim 12 wherein the thermoplastic film layer is formed of a polymer selected from the group consisting of vinyl chloride, polyvinyl chloride, polyurethane, synthetic rubber, natural rubber, a mixture of natural and synthetic rubber, neoprene basis composition, and acrylic acid basis composition.

14. A process as in claim 1, 5 or 7 further comprising the step of casting a flexible foam layer to an elastic film to form the elastic composition layer.

15. A process as in claim 1, 5 or 7 wherein the fabric layer is formed of a polymer selected of the group consisting of polyamide, polyester, polyvinyl chloride, polyvinyl chloride copolymer, wool, cotton and combinations thereof.

16. A process as in claim 1, 5 or 7 wherein:

the process further comprises the step of bonding a flexible foam layer to a thermoplastic film layer, and bonding the foam layer to the fabric layer in order to form the cloth; and

the heating step includes the step of heating the cloth to at least the softening temperature of the film layer.

19. A process as in claim 1, 5 or 17 wherein the drawing step includes the step of creating a vacuum between the cloth and the mold to thereby conform the cloth to the shape of the mold.

20. A process as in claim 1, 3, 5 or 17 further comprising the step of pouring foam into the mold after the cooling step.

2. A process for molding cloth comprising the steps of:

drawing the cloth into a heated mold, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the elastic composition layer including a thermoplastic film layer, the temperature of the mold being at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer;

heating the cloth to at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth, the process heat-fixing the heat-fixable fiber and the film layer to the shape of the mold.

3. A process for molding cloth comprising the step of:

drawing the cloth into a heated mold, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the elastic composition including a flexible foam layer and a thermoplastic film layer, the temperature of the mold being at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer;

heating the cloth to at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth, the process heat-fixing the heat-fixable fiber and the film layer to the shape of the mold.

5. A process for molding cloth comprising the steps of:

preheating the cloth, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the temperature to which the cloth is preheated being at least the heat-fixable fiber set temperature;

drawing the cloth into a heated mold, the temperature of the mold being at least the heat-fixable fiber set temperature;

heating the cloth to at least the heat-fixable fiber set temperature, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth, the process heat-fixing the heat-fixable fiber of the cloth to the shape of the mold.

6. The process for molding cloth comprising the steps of:

preheating the cloth, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the elastic composition layer including a thermoplastic film layer, the temperature to which the cloth is preheated being at least the greater of the set temperature of the heated-fixable fiber and the softening temperature of the film layer;

drawing the cloth into a heated mold, the temperature of the mold being at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer;

heating the cloth to at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth, the process heat-fixing the heat-fixable fiber and the film layer to the shape of the mold.

7. A process for forming a cloth-covered item comprising the steps of:

preheating the cloth, the cloth including a fabric layer having a heat-fixable fiber, and an elastic composition layer bonded to the fabric layer, the temperature to which the cloth is preheated being at least the heat-fixable fiber set temperature;

drawing the cloth into a heated mold, the temperature of the mold being at least the heat-fixable fiber set temperature;

heating the cloth to at least the heat-fixable fiber set temperature, including the step of transferring energy from the heated mold to the cloth;

cooling the cloth; and

pouring foam into the mold, the process heat-fixing the heat-fixable fiber of the cloth to the shape of the mold and filling the back side of the molded cloth with foam.

17. A process for molding cloth comprising the steps of:

bonding a flexible foam layer to a thermoplastic film layer, the foam layer and film layer forming an elastic composition layer;

bonding the foam layer to a fabric layer having a heat-fixable fiber, the cloth comprising the foam layer, film layer and fabric layer;

preheating the cloth to at least the greater of the set temperature of the fabric layer and the softening temperature of the film layer;

drawing the cloth into a heated mold, the temperature of the mold being at least the greater of the set temperature of the fabric layer and the softening temperature of the film layer;

heating the cloth in the mold to at least the greater of the set temperature of the fabric layer and the softening temperature of the film layer, including the step of transferring energy from the heated mold to the cloth; and

cooling the cloth in the mold, the process heat-fixing the heat-fixable fiber of the fabric layer and the film layer to the shape of the mold.

18. A process as in claim 2, 6 or 17 wherein the film layer is formed of a polymer selected from the group consisting of vinyl chloride, polyvinyl chloride, polyurethane, synthetic rubber, natural rubber, a mixture of natural and synthetic rubber, neoprene-basis composition, and acrylic acid basis composition.

21. A process for forming a cloth-covered item comprising the steps of:

bonding a flexible form layer to a thermoplastic film layer, the foam layer and film layer forming an elastic composition layer;

bonding the foam layer to a fabric layer having a heat-fixable fiber, the cloth comprising the foam layer, the film layer and the fabric layer;

preheating the cloth to a temperature of at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer;

drawing the cloth into a heated mold, the temperature of the mold being at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer;

heating the cloth to at least the greater of the set temperature of the heat-fixable fiber and the softening temperature of the film layer, including the step of transferring energy from the heated mold to the cloth;

cooling the cloth; and

pouring foam into the mold, the process heat-fixing the heat-fixable fiber of the fabric layer and the film layer to the shape of the mold and filling the back side of the molded cloth with foam.