Production of foamed beads
Abstract
Abstract A DISPERSION OF CRYSTALLINE POLYMER PARTICLES IN A MEDIUM IS HELD IN A HIGH-PRESSURE REGION AT A PRESSURE ABOVE THE SATURATE VAPOR PRESSURE OF THE DISPERSION AND AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER AND OF A VALUE AT WHICH CRYSTALLIZATION OF THE POLYMER PROGRESSES THEREBY TO CAUSE INFILTRATION OF THE DISPERSION MEDIUM INTO THE POLYMER PARTICLES DUE TO VOLUMETRIC SHRINKAGE OF THE POLYMER ACCOMPANYING CRYSTALLIZATION THEREOF AND THEREBY TO FORM A DISPERSION OF FOAMABLE POLYMER PARTICLES, AND THIS DISPERSION IS EJECTED FROM THE HIGH-PRESSURE REGION INTO A LOW PRESSURE REGION AT A PRESSURE BELOW THE SATURATED VAPOR PRESSURE OF THIS DISPERSION AND AT A TEMPERATURE LOWER THAN THE MELTING POINT OF THE POLYMER.
Inventors
- 👤 T Fukuda
- 👤 S Ueki
- 👤 Y Miyata
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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