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Method of manufacturing articles from hot solid filler material coated with thermoplastic material

  • US 3,897,527 A
  • Filed: 03/28/1972
  • Issued: 07/29/1975
  • Est. Priority Date: 11/03/1969
  • Status: Expired due to Term
First Claim
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1. THE METHOD OF MANUFACTURING ARTICLES FROM PARTICLES OF SOLID GRANULAR FILLER MATERIAL AND THERMOPLASTIC MATERIAL, IN WHICH THE PARTICLES OF SOLID GRANULAR MATERIAL ARE COATED WITH THERMOPLASTIC MATERIAL, THE METHOD COMPRISING THE STEPS OF CONDUCTING PARTICLES OF SOLID GRANULAR MATERIAL ADAPTED TO STORE HEAT THROUGH A HEATING ZONE AND THEREIN HEATING THE SOLID PARTICLES TO BE COATED TO A TEMPERATURE SUBSTANTIALLY IN EXCESS OF THAT REQUIRED TO MELT THE THERMOPLASTIC MATERIAL IN QUANTITIES SUFFICIENT TO COAT THE SOLID PARTICLES WITH THE STORED HEAT THEREIN, SAID PARTICLES OF SOLID GRANULAR MATERIAL GEING STABLE AND SUBSTANTIALLY RESISTANT TO DISINTEGRATION AT THE TEMPERATURE USED, CONDUCTING THE RESULTING SOLID PARTICLES INTO A MIXING ZONE SUBSEQUENT TO SAID HEATING, SUPPLYING POWDERED THERMOPLASTIC MATERIAL TO THE MIXING ZONE IN A PROPORTION SUFFICIENT TO COAT SAID SOLID PARTICLES, THOROUGHLY MINGLING THE SOLID PARTICLES WITH SAID PROPORTION OF POWDERED THERMOPLASTIC MATERIAL AND MELTING SAID THERMOPLASTIC MATERIAL ONTO THE SURFACES OF THE SOLID PARTICLES BY UTILIZING THE STORED HEAT OF SAID PARTICLES TO MELT SAID THERMOPLASTIC MATERIAL AND THUS COAT THE PARTICLES, PASSING THE RESULTING PLASTIC-COATED SOLID PARTICLES DIRECTLY AND CONTINUOUSLY INTO A MOLD HAVING A SHAPE OF THE ARTICLE TO BE PRODUCED UNTIL SAID MOLD IS FILLED, THE PLASTICCOATED SOLID PARTICLES AS DELIVERED INTO THE MOLD BEING AT SUCH A TEMPERATURE AND CONTAINING SUCH AN AMOUNT OF STORED HEAT AS A RESULT OF THE HEATING IN THE HEATING ZONE AS TO MAINTAIN THE PLASTIC COATING AT A TEMPERATURE SUCH THAT THE PARTICLES OF PLASTIC-COATED SOLID PARTICLES STICK TO EACH OTHER IN THE MOLD, AND COOLING THE PARTICLES IN THE MOLD SUFFICIENTLY TO PERMIT REMOVAL OF THE MOLDED ARTICLE FROM THE MOLD.

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