Process for preparing container having a foamed wall

B - Operations – Transporting – 29 – D

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B29D 22/00 (2006.01) B29C 69/02 (2006.01)

Patent

CA 2697228

A process for making a container comprises injection molding a polymer preform having a non-reactive gas entrapped within the walls thereof; cooling the preform to a temperature below the polymer softening temperature, the cooled preform having an initial material volume; reheating the cooled preform to a temperature greater than the polymer softening temperature; and blow molding the reheated preform, to prepare a container consisting essentially of a microcellular foamed polymer having a non-reactive gas contained within the foam cells, wherein the material volume of the container is greater than the initial material volume of the cooled preform measured at the same temperature.

L'invention concerne un procédé de fabrication d'un contenant comprenant le moulage par injection d'une préforme de polymère ayant un gaz non réactif piégé à l'intérieur des parois de celle-ci ; le refroidissement de la préforme à une température en dessous de la température de ramollissement du polymère, la préforme refroidie ayant un volume de matériau initial ; le réchauffage de la préforme refroidie à une température supérieure à la température de ramollissement du polymère ; et le moulage-soufflage de la préforme réchauffée, pour préparer un contenant essentiellement constitué d'un polymère mousse microcellulaire ayant un gaz non réactif contenu à l'intérieur de cellules de la mousse, le volume du matériau du contenant étant supérieur au volume du matériau initial de la préforme refroidie mesurée à la même température.

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