Fabrication of cellular plastic bodies

• US 3,060,513 A
• Filed: 12/21/1959
• Issued: 10/30/1962
• Est. Priority Date: 12/21/1959
• Status: Expired due to Term

• Current Assignee: Frank H. Justin, John D. Klink
• Original Assignee: Frank H. Justin, John D. Klink
• Inventors: Klink, John D., Justin, Frank H.
• Application Number:
  US03/860,768
• Time in Patent Office: 1,044 Days
• US Class Current: 264/418
• CPC Class Codes: B29C 44/3415 Heating or cooling
• CPC Class Codes: B29C 44/3426 Heating by introducing steam in the mould
• CPC Class Codes: B29C 44/445 in the form of expandable granules, particles or beads
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: C08J 9/232 by sintering expandable particles
• CPC Class Codes: Y10S 264/46 Molding using an electrical heat
• CPC Class Codes: Y10S 521/915 Utilizing electrical or wave energy during cell forming process

Claims

1. METHOD FOR FABRICATING AN INTERGRAL FOAM STRUCTURE HAVING A DENSITY OF FROM ABOUT 0.2 TO ABOUT 0.5 POUND PER CUBIC FOOT EXPANDED THERMOPLASTIC ALKENYL AROMATIC RESINOUS MATERIAL IN PARTICULATE FORM WHICH COMPRISES WETTING A PARTICULATE MASS OF EXPANED THERMO-PLASTIC MATERIAL WITH WATER, CONTAINING SAID MASS IN A SHRINKABLE MOLD FORM WHILE BEING FABRICATED AND THEN SIMULTANEOUSLY COMPRESSING BY MEANS OF SOLID SHRINKABLE MOLD FORM AND DIELECTRICALLY HEATING THE WET MASS TO SOFTEN THE MASS AND CAUSE FUSION OF THE EXPANDED PARTICLES IN THE MASS WHILE IT IS BEING COMPRESSED TO KNIT SAID MASS COHERENTLY TOGETHER WHILE VAPORIZING THE WATER FROM THE MASS.