Process for manufacturing a padded element using a cover preforming mandrel

• US 5,468,433 A
• Filed: 11/18/1993
• Issued: 11/21/1995
• Est. Priority Date: 11/18/1993
• Status: Expired due to Fees

• Current Assignee: Woodbridge Foam Corporation
• Original Assignee: Woodbridge Foam Corporation
• Inventors: Perry, Brian, Donato, Frank
• Primary Examiner(s): Kuhns, Allan R.
• Application Number:
  US08/153,957
• Time in Patent Office: 733 Days
• Field of Search: 264/46.4, 264/46.6, 264/46.8, 264/321, 264/512, 264/257, 264/554
• US Class Current: 264/46.4
• CPC Class Codes: B29C 44/146 Shaping the lining before foaming

Abstract

There is disclosed a process for manufacturing a padded element. The process comprises the steps of placing a trim cover on a mandrel, the trim cover having a finished outer surface and an inner surface comprised of a thermoformable foam layer; heating the trim cover to a temperature sufficient to shape the thermoformable foam layer; shaping the trim cover to substantially the same shape as the mandrel to produce a shaped trim cover; transferring the shaped trim cover from the mandrel to a lower mold having shape substantially complimentary to the shaped trim cover; placing an upper mold over the lower mold to define a mold cavity; dispensing a liquid foamable polymeric composition in the mold cavity; and expanding the liquid foamable polymeric composition to fill substantially the mold cavity thereby forming the padded element.

Claims

1. A process for manufacturing a padded element comprising the steps of:

(i) placing a trim cover on a mandrel, the trim cover having a finished outer surface and an inner surface comprised of a thermoformable foam layer;

(ii) heating the trim cover, while the trim cover is on the mandrel, to a temperature sufficient to shape the thermoformable foam layer;

(iii) shaping the trim cover to substantially the same shape as the mandrel to produce a shaped trim cover;

(iv) transferring the shaped trim cover from the mandrel to a lower mold having a shape substantially complementary to the shaped trim cover;

(v) placing an upper mold over the lower mold to define a mold cavity;

(vi) dispensing a liquid foamable polymeric composition in the mold cavity; and

(vii) expanding the liquid foamable polymeric composition to fill substantially the mold cavity thereby forming the padded element.

2. The process defined in claim 1, wherein said upper mold and said lower mold are closed prior to dispensing said liquid foamable polymeric composition.

3. The process defined in claim 1, wherein said upper mold and said lower mold are closed after dispensing said liquid foamable polymeric composition.

4. The process defined in claim 1, wherein said mandrel comprises means to retain said trim cover in place.

5. The process defined in claim 1, wherein said trim cover is heated prior to being affixed on said mandrel.

6. The process defined in claim 1, wherein said mandrel comprises a hollow body having a plurality of perforations.

7. The process defined in claim 1, wherein said thermoformable foam layer is a polyurethane foam.

8. The process defined in claim 7, wherein said trim cover is heated to a temperature in the range of from about 80°

C. to about 180°

C.

9. The process defined in claim 7, wherein said trim cover is heated to a temperature in the range of from about 100°

C. to about 140°

C.

10. The process defined in claim 7, wherein said trim cover is heated to a temperature in the range of from about 110°

C. to about 120°

C.

11. The process defined in claim 1, wherein said trim cover is air impermeable.

12. The process defined in claim 1, wherein the finished outer surface of said trim cover is made of at least one of leather and vinyl.

13. The process defined in claim 1, wherein said trim cover is air permeable.

14. The process defined in claim 1, wherein the finished outer surface of said trim cover is made of cloth.

15. The process defined in claim 14, wherein said cloth is a reticulated fabric.

16. The process defined in claim 1, wherein said polymeric composition comprises polyurethane.

17. The process defined in claim 1, wherein said padded element is a component of a vehicle interior.

18. The process defined in claim 6, wherein step (ii) comprises heating from the interior of the mandrel and through said perforations.

19. A process for manufacturing a padded element comprising the steps of:

(i) affixing a trim cover to a mandrel, the trim cover having a finished outer surface and an inner surface comprised of a thermoformable polyurethane foam layer;

(ii) heating the mandrel and the trim cover, while the trim cover is on the mandrel, to a temperature sufficient to initiate shaping of the thermoformable foam layer;

(iii) shaping the trim cover to substantially the same shape as the mandrel to produce a shaped trim cover;

(iv) cooling the shaped trim cover;

(v) transferring the shaped trim cover from the mandrel to a lower mold having a shape substantially complementary to the shaped trim cover;

(vi) placing an upper mold over the lower mold to define a mold cavity;

(vii) dispensing a liquid foamable polyurethane composition in the mold cavity; and

(viii) expanding the liquid foamable polymeric composition to fill substantially the mold cavity thereby forming the padded element.

20. A process for manufacturing a padded element comprising the steps of:

(i) placing a trim cover on a mandrel, the trim cover having a finished outer surface and an inner surface comprising a thermoformable foam layer;

(ii) heating the trim cover to a temperature sufficient to shape the thermoformable foam layer;

(iii) shaping the trim cover to substantially the same shape as the mandrel to produce a shaped trim cover;

(iv) cooling the shaped trim cover to produce a cooled trim cover which retains its shape independent of the mandrel;

(v) transferring the shaped trim cover from the mandrel to a lower mold having a shape substantially complementary to the shaped trim cover;

(vi) placing an upper mold over the lower mold to define a mold cavity;

(vii) dispensing a liquid foamable polymeric composition in the mold cavity; and

(viii) expanding the liquid foamable polymeric composition to fill substantially the mold cavity, thereby forming the padded element.