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Method of manufacturing a molded composite urethane foam structural panel

  • US 3,895,087 A
  • Filed: 11/26/1971
  • Issued: 07/15/1975
  • Est. Priority Date: 11/26/1971
  • Status: Expired due to Term
First Claim
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1. PROCESS FOR MANUFACTURING A HIGH QUALITY MOLDED URETHANE FOAM STRUCTURAL PANEL WHICH COMPRISES CONTINUOUSLY APPLYING A THIN PLASTIC FILM TO A BELT WHICH CONTINUOUSLY MOVES ALONG A MOLD, INTRODUCING A RELATIVELY HIGH DENSITY FOAMABLE URETHANE MIXTURE ONTO SAID FILM FROM A FIRST SPRAY APPLICATOR, SUBSEQUENTLY CONTINUOUSLY INTRODUCING ADDITIONAL RELATIVELY LOW DENSITY FOAMABLE URETHANE MIXTURE ONTO SAID PLASTIC FILM FROM A SECOND SPRAY APPLICATOR IN A MANNER THAT THE SPRAY FROM SAID SECOND APPLICATOR SLIGHTLY OVERLAPS THE SPRAY FROM SAID FIRST APPLICATOR, AND IN A MANNER THAT THE FOAMABLE URETHANE MIXTURE FROM SAID FIRST APPLICATOR COMPLETELY COVERS THE FOAMABLE URETHANE MIXTURE FROM SAID FIRST APPLICATOR, CONFORMING SAID FILM TO THE MOLD CONFIGURATION BY MEANS OF A VACUUM, AND FORMING A URETHANE FOAM SUBSTRATE ON SAID PLASTIC FILM, AND THEN SEPARATING SAID BELT FROM SAID PLASTIC FILM SUPPORTED BY SAID URETHANE FOAM SUBSTRATE.

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