Patent · US Expired

Process and apparatus for producing thermoplastic resin foam

US4508669A · kind A · utility

7Cited by
2References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 25, 1984
Grant dateApr 2, 1985
Priority date
Expiry dateApr 25, 2004

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S521/917
  • WIPO fieldOther special machines
  • WIPO sectorMechanical engineering

Abstract

In a process for producing a thermoplastic resin foam which comprises continuously heat-foaming a foamable thermoplastic resin sheet containing a heat-decomposable organic blowing agent with a heated gas, the improvement wherein a gas containing sublimation products generated by the heat-foaming of the foamable sheet is burned to decompose the sublimation products and obtain a treated gas having a substantially reduced content of the sublimation products, and the treated gas is then used as the heated gas for the heat-foaming of the foamable sheet; and a apparatus for producing a thermoplastic resin foam by continuously heat-foaming a foamable thermoplastic resin sheet, said apparatus comprising a heat-foaming chamber having an inlet portion for feeding the foamable thermoplastic resin sheet, an outlet portion for discharging the foamed sheet, a discharge port for a gas containing sublimation products generated by the heat-foaming of said foamable sheet, and a supply port for a heated gas, said discharge port and said supply port being connected by pipe lines to form a circulating pipe line, and said circulating pipe passage having a burning device for burning said gas containing s…

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.