DOUBLE WEB DIFFERENTIAL FORMING APPARATUS

• US 3,583,036 A
• Filed: 04/07/1969
• Issued: 06/08/1971
• Est. Priority Date: 04/07/1969
• Status: Expired due to Term

• Current Assignee: John Brown Industries Limited
• Original Assignee: Gaylord W. Brown
• Inventors: Brown, Gaylord W.
• Application Number:
  US04/814,527
• Time in Patent Office: 792 Days
• US Class Current: 425/185
• CPC Class Codes: B29C 49/36 rotatable about one axis
• CPC Class Codes: B29C 49/48 Moulds
• CPC Class Codes: B29C 49/4817 with means for closing off parison ends
• CPC Class Codes: B29C 51/22 rotatable about an axis

Abstract

APPARATUS AND METHODS FOR FORMING A CONTAINER OR LIKE HOLLOW ARTICLE IN A PAIR OF HEAT FUSIBLE, THERMOPLASTIC SHEETS MOUNTED IN SPACED RELATION IN AN INDEXIBLE CLAMP FRAME ASSEMBLY WHEREIN THE FRAME ASSEMBLY IS ADVANCED FROM A HEATING STATION TO A PAIR OF MOLDS WHICH CLOSE TO HEAT FUSE THE SHEETS AND DIFFERENTIAL PRESSURE FORM THE ARTICLE THEREIN. AN AIR STREAM INJECTOR CARRIED BY THE FRAME ASSEMBLY INTRODUCES HEATED AIR TO MAINTAIN THE HEATED AND SAGGING SHEETS APART UNTIL THE MOLDS ARE CLOSED, AND COOL AIR UNDER GREATER PRESSURE IS THEN INTRODUCED BY THE INJECTOR TO FORM THE ARTICLE. A PERIMETRAL CHANNEL IS PROVIDED IN THE MOLDS IMMEDIATELY ADJACENT TO THE CAVITIES THEREIN WHICH IS FILLED WITH FORMING AIR BY THE INJECTOR AND AIDS IN THE RAPID COOLING EFFECTED.

Claims