Method of reinforcing the wall of a thermo-formed article
Abstract
Abstract AN IMPROVEMENT IN THE PROCESS FORDRAWING A SHEET OF THERMOPLASTIC, SYNTHETIC RESIN TO FORM A SHELL-LIKE SHAPED ARTICLE OF A TYPE WHICH WILL HAVE WALL PORTIONS EXCESSIVELY THIN AS A RESULT OF THE NORMAL DRAWING AND STRETCHING OF THE PLASTIC SHEET TO FORM THE ARTICLE. THE SHEET ISTHICKENED BEFORE IT IS DRAWN BY THE ADDITION OF SMALL PLASTIC PARTTICLES AT AREAS WHICH WILL FORM THE EXCESSIVELY THIN WALL PORTIONS OF THE ARTICLE AFTER IT IS DRAWN. THE PLASTIC PARTICLES ARE MELTED AND WELDED INTO THE SHEET WHILE IT IS BEING HEATED FOR THE DRAWING OPERATION, A SOURCE OF RADIANT HEAT BEING NECESSARY TO EFFECT THIS MELTING AND WELDING OF THE PARTICLES TO THE SHEET WITHOUT OVERHEATING THE SHEET.
Inventors
- 👤 A Voorhees
Bibliographic Details
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