Container having a foamed wall
AssigneePlastic Technologies, Inc.
InventorsFrank E. Semersky, William D. Voyles
Life of this patent
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Abstract
A multi-layer preform having at least one foamed layer suitable for forming a multi-layer blow molded container having at least one foamed layer container is disclosed, the multi-layer container formed by a process comprising the steps of injection molding a polymer melt having a non-reactive gas entrained therein, causing entrained gas cells in the polymer melt to open to form a polymer preform having an open cell foam layer, cooling the preform to a temperature below the polymer softening temperature, reheating the preform to a temperature greater than the polymer softening temperature, and blow molding the preform in a second mold, to prepare the container. At least one layer of the container may be blended with an oxygen and/or carbon dioxide barrier material.
Claims14
A blow molded plastic container including a hollow body and an externally threaded neck providing communication with the hollow body, the container made by a process comprising:
- heating a preform to a softening temperature, the preform comprising a first layer of foamed plastic, a second layer of unfoamed plastic contacting the first layer, a third layer of foamed plastic contacting the second layer, a fourth layer of unfoamed plastic contacting the third layer, and a fifth layer of foamed plastic contacting the fourth layer;
- and
- blow molding the heated preform to form a container comprising the first layer of foamed plastic with a porosity consisting of open cells, the second layer of unfoamed plastic, the third layer of foamed plastic with a porosity consisting of closed cells, the fourth layer of unfoamed plastic, and the fifth layer of foamed plastic as a foamed layer.
Dependencies are inferred from the claim text.