MICROCELLULAR INJECTION MOLDING PROCESSES FOR PERSONAL AND CONSUMER CARE PRODUCTS AND PACKAGING
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United States of America Patent
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Issued Date -
Aug 5, 2010
app pub date -
Feb 5, 2009
filing date -
Feb 5, 2009
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Abandoned
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Abstract
A method of injection molding produces a microcellular material. In this method, a polymer is melted and blended with a supercritical fluid to produce a single-phase polymer-gas solution. This solution is injected through a nozzle and into a mold. When injected through the nozzle, gas in the solution (from the supercritical fluid) emerges from the polymer, which then solidifies. In emerging from the solution, the gas causes the nucleation of cells that result in a microcellular structure. A foam material comprises a polymer having a microcellular structure formed by the nucleation of micro-cells. The micro-cells are formed by the dispersing of a supercritical fluid in a liquid solution of the polymer when the polymer is subjected to a pressure drop. A feminine hygiene device is fabricated from a foamed polymer.
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