Microcellular injection molding processes for personal and...

B - Operations – Transporting – 29 – C

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B29C 44/34 (2006.01) A61F 13/26 (2006.01)

Patent

CA 2751643

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.

La présente invention concerne un procédé de moulage par injection produisant une substance microcellulaire. Dans ce procédé, un polymère est fondu et mélangé à un fluide supercritique pour produire une solution gaz-polymère monophasique. Cette solution est injectée par une buse à l'intérieur d'un moule. Lorsque la solution est injectée au moyen de la buse, le gaz contenu dans la solution (qui provient du fluide supercritique) émerge du polymère qui solidifie ensuite. En émergeant de la solution, le gaz provoque la nucléation de cellules, ce qui permet de produire une structure microcellulaire. Un matériau de mousse comprend un polymère ayant une structure microcellulaire formée par la nucléation de microcellules. Les microcellules sont formées par la dispersion d'un fluide supercritique dans une solution liquide du polymère lorsque le polymère est soumis à une baisse de pression. Un dispositif d'hygiène féminine est fabriqué à partir d'un polymère de type mousse.

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