Method of forming patterned articles employing differential pressure
Abstract
Abstract PATTERNED ARTICLES ARE PRODUCED FROM HEAT SOFTENABLE VISCOELASTIC PSEUDOPLASTICS AT TEMPERATURES ABOVE THEIR SOFTENING POINTS BY PASSING SAID MATERIALS THROUGH A RESTRICTED CROSS-SECTION AT A TEMPERATURE ABOVE THE SOFTENING POINT AT A RATE SUFFICIENT TO PRODUCE TURBULENT FLOW AND INTERNAL STRAIN WITHIN SAID HEAT SOFTENABLE MATERIAL IN EXCESS OF THE CRITICAL STRAIN RATE OF SAID MATERIAL TO PRODUCE PATTERNED DEFORMATIONS THEREIN AND CONFORMING THE RESULTANT PATTERNED MATERIAL TO A PREDETERMINED SHAPE AT A TEMPERATURE ABOVE THE SOFTENING POINT AT WHICH THE MATERIAL WILL NOT FLOW SUBSTANTIALLY UNDER ITS OWN WEIGHT AND REDUCING THE TEMPERATURE TO A POINT BELOW THE SOFTENING POINT.
Inventors
- 👤 Gerald A Matthews
- 👤 Claude C Spencer Jr
Bibliographic Details
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