Plastic molding process and products produced thereby

Details Plastic molding process and products produced thereby Plastic molding process and products produced thereby

B - Operations, Transporting

29

C

B29C 43/18 (2006.01) B29C 43/14 (2006.01) B29C 70/70 (2006.01)

Patent

CA 2197136

The invention utilizes the adhesive properties which plastic material exhibits while still hot combined with a multi stage molding operation wherein one side of an insert or core located in one side of a mold is coated with molten plastic on a first closing of the mold, the mold is then opened with the plastic still hot to remove the insert or core from the one mold side by virtue of its adherence by the hot plastic to the other mold side, a second charge of plastic is then introduced into the said one mold side and the mold is closed again with the plastic in a molten state to complete the encapsulation of the insert or core. The invention also relates to completely encapsulated inserts orcores produced by the method aforesaid.

L'invention se sert des propriétés adhésives de la matière plastique chaude et d'une opération de moulage en plusieurs étapes. Un côté d'un prisonnier ou d'un noyau placé sur un côté du moule est recouvert de plastique fluide à la première fermeture du moule. Puis, pendant que le plastique est encore chaud, le moule est ouvert pour retirer le prisonnier ou le noyau de ce côté grâce à son adhérence par le plastique chaud à l'autre côté du moule. Une seconde charge de plastique fluide est alors introduite dans le côté susmentionné du moule. Ce dernier est ensuite fermé pour terminer l'encapsulation du prisonnier ou du noyau. L'invention porte également sur des prisonniers ou des noyaux complètement encapsulés fabriqués par la méthode décrite plus haut.

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