Process of molding giant articles of structured plastic
Abstract
Abstract PROGRAMMING, AND/OR DIFFERENTIAL PRESSURE PROGRAMMING FOR DIFFERENT ZONES OF THE ARTICLE. VARIOUS SUPPLEMENTAL AND/OR OPTIONAL FEATURES ARE DISCLOSED. GIANT SIZED PLASTIC ARTICLES ARE MASS PRODUCED WITH AUTOMATION BY LOW PRESSURE INJECTION MOLDING. AN ARTICLE IS DESIGNED TO ACHIEVE THE ULTIMATE ENGINEERING PERFORMANCE OF THE INTERNAL STRUCTURE IN RELATION TO ITS EXTERNAL SHAPE, THUS PROVIDING ZONES IN WHICH THE INTERNAL STRUCTURE IS DIFFERENT FROM OTHER ZONES, ANDSUCH DIFFERENCES ARE IMPARTED BY THE CONTROL OF THE MOLDING PROCESS. THE PROPORTIONS OF GAS AND MOLTEN PLASTIC ARE CAREFULLY CONTROLLED PRIOR TO THE ACCUMULATION OF THE FEED IN A BATCHING DEVICE. A SHOT OF FEED FLOWS THROUGH A DISTRIBUTION SYSTEM INTO A STRUCTURIZER MOLD HAVING CONTOURED WALLS OF LOW SPECIFIC HEAT AND HAVING HEAT TRANSFER MEANS PERMITTING DIFFERENTIAL PROGRAMMING OF THE TEMPERATURE OF DIFFERENT ZONES. BEFORE THE ARTICLE HAS SOLIDIFIED IN THE STRUCTURIZER MOLD, THE DESIRED DIFFERENCES IN INTERNAL STRUCTURE ARE IMPARTED BY REASON OF THE DIFFERENTIAL TEMPERATURE
Inventors
- 👤 F Nussbaum
Bibliographic Details
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