Process for producing foam moldings with an insert

• US 4,420,447 A
• Filed: 01/05/1982
• Issued: 12/13/1983
• Est. Priority Date: 01/16/1981
• Status: Expired due to Term

• Current Assignee: Tokai Chemical Industries, Ltd. (Sumitomo Corporation)
• Original Assignee: Tokai Chemical Industries, Ltd. (Sumitomo Corporation)
• Inventors: Nakashima, Akira
• Primary Examiner(s): Anderson, Philip E.
• Application Number:
  US06/337,171
• Time in Patent Office: 707 Days
• Field of Search: 264/46.5, 264/45.5, 264/46.4, 264/46.8, 264/46.7, 264/161, 249/172, 425/817 R
• US Class Current: 264/46.4
• CPC Class Codes: B29C 33/12 with incorporated means for positioning inserts, e.g. labels positioning reinforcements B29C70/541
• CPC Class Codes: B29C 44/12 Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
• CPC Class Codes: B29C 44/14 the preformed part being a lining B29C44/1209 takes precedence
• CPC Class Codes: B29C 44/351 Means for preventing foam to leak out from the foaming device during foaming
• CPC Class Codes: B29C 70/68 by incorporating or moulding on preformed parts, e.g. inserts or layers , e.g. foam blocks mould constructions therefor B29C33/12; joining preformed parts by moulding B29C65/70
• CPC Class Codes: B29K 2105/04 cellular or porous
• CPC Class Codes: B29L 2031/3005 Body finishings

Abstract

Process for producing foam moldings with an insert executed in a mold for foam molding consisting of a core block and a cavity block. The process comprises steps of: (a) having a film adhering to and covering the insert on one side thereof where a foam layer is formed; (b) letting the skirt portion of the film to be pinched or sandwiched by the uniting portion of the two blocks while the foaming process is executed on a foamable material; and (c) forming integrally the foam layer on that side of the insert, with the film being retained between the insert and the foam layer to be obtained.

Claims

1. A process for producing a foam molding including an insert of predetermined shape wherein the insert is set in a mold consisting essentially of a core block and a cavity block for foaming a foamable material in a cavity defined in said mold so as to form a foamed body on one side of said insert, said process comprising the steps of:

preparing an insert assembly consisting of said insert and a film having portions adhering to a surface of said insert on said one side thereof, said film extending so as to match a partial profile of said foamed body and covering a surface of said core and cavity blocks, said film further having skirt portions adapted to extend between respective joining portion of said core and cavity blocks;

setting said insert assembly on said one of the core and cavity blocks such that said skirt portions extend over the surface of said joining portion of the one block;

enclosing said cavity by joining said core and cavity blocks such that said skirt portions are pinched by said joining portions; and

pouring said foamable material into a space formed between said film and a surface of the other blocks to define said cavity.

3. A process in accordance with claim 1 or 2, further comprising the step of setting a skin sheet on the surface of said other block before said foamable material is poured between said film and an inner surface of said skin sheet forming an outer shell of said foam molding.

4. A process in accordance with claim 1 or 2, further comprising the step of removing unnecessary parts of said film from the completed foam molding after the molding is released from said mold, said unnecessary parts including said skirt portions.

5. A process in accordance with claim 1 or 2, wherein said film is secured with adhesive to the surface of said insert on said one side thereof.

6. A process in accordance with claim 1 or 2, wherein said film is made of a synthetic resin and has a thickness not more than 2 mm.

7. A process in accordance with claim 1 or 2, wherein said film has a thickness in the range between 0.03 mm and 1.0 mm.

8. A process in accordance with claim 1 or 2, wherein said foamable material is a polyurethane premix composition and a foamed polyurethane body is formed on said one side of the insert due to foaming reaction of said polyurethane premix composition.

9. A process in accordance with claim 1 or 2, wherein said foamable material is poured into said cavity formed in said cavity block before said core block and said cavity block are joined and clamped together.

10. A process in accordance with claim 1 or 2, wherein said insert assembly including the film is set on the surface of said cavity block, said core block and said cavity block being subsequently joined together, and the foamable material being then poured into a foaming space formed between said film and said surface of the cavity block through at least one pour-hole bored in said core block.

2. A process for producing a foam molding including at least one insert of predetermined shape wherein the insert is set in a mold consisting of a core block and a cavity block for foaming a foamable material in a cavity defined in said mold so as to form a foamed body on one side of said insert, said process comprising the steps of:

setting said insert on one of said core and cavity blocks;

covering a surface of said one of the core and cavity blocks with a film having portions adhering to a surface of said insert on said one side thereof, said film extending so as to match a partial profile of said foamed body and further having skirt portions adapted to extend between respective joining portions of said core and cavity blocks, said insert and said film constituting an insert assembly;

enclosing said cavity by joining said core and cavity blocks such that said skirt portions are pinched by said joining portions; and

pouring said foamable material into a space formed between said film and a surface of the other block to define said cavity.