Method of manufacturing a foam-molded product

Details Method of manufacturing a foam-molded product Method of manufacturing a foam-molded product

B - Operations, Transporting

29

C

B29C 44/04 (2006.01)

Patent

CA 2377510

An improved method of manufacturing a foam-molded product is provided including the steps of: filling a resin containing a foaming agent into a mold cavity by injection within a time period from a time point just before completion of mold clamping to a time point after the completion of mold clamping allowing the resin thus filled in the mold cavity to form a skin layer over a surface thereof thereafter retracting a movable mold to define a predetermined cavity clearance between the movable mold and a stationary mold, so as to cause the foaming agent contained in an uncured portion of the resin to foam and cooling the resin filled in the cavity mold to form a foam-molded product having a surface forming a tight skin layer and an inside portion in a foamed state.

Une méthode améliorée de fabrication d'un article moulé en mousse comprend les étapes qui suivent. Le remplissage d'une résine contenant un agent moussant dans une empreinte, par injection pendant un certain temps, d'un instant précédant juste la fermeture du moule, jusqu'à l'instant suivant sa fermeture. Ainsi, la résine qui remplit l'empreinte forme par la suite une pellicule au-dessus de la surface. Il en résulte la rétraction d'un moule amovible pour déterminer un jeu prédéterminé de l'empreinte, entre le moule amovible et un moule fixe. Ainsi, l'agent moussant contenu dans une partie non traitée de la résine, mousse, et la résine qui remplit l'empreinte refroidit pour former un article moulé en mousse dont la surface forme une pellicule imperméable et la partie interne à l'état de mousse.

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