Optimization of in-mold coating injection molded...

Details Optimization of in-mold coating injection molded... Optimization of in-mold coating injection molded...

B - Operations, Transporting

29

C

B29C 45/16 (2006.01)

Patent

CA 2503311

The present invention is a process for producing an injection-molded thermoplastic workpiece having a thermoset coating bonded thereto, comprising the steps of introducing in three stages into a closed mold a thermoplastic material, such as a polyolefin, heated to a temperature above its melting point and molding said material to form o workpiece; cooling the workpiece to a temperature less than its melt temperature introducing a thermoset coating composition into the closed mold to cover at least a portion of a surface of the workpiece. The mold is then opened and the workpiece is removed after the coating composition has at least partially cured. The invention is also directed to a molded article made by the described process.

L'invention concerne un procédé permettant de produire une pièce thermoplastique moulée par injection sur laquelle est collé un revêtement thermodurci. Ce procédé consiste à introduire, en trois étapes, dans un moule fermé, un matériau thermoplastique, tel qu'une polyoléfine, chauffé à une température supérieure à son point de fusion et à mouler ledit matériau afin de former une pièce ; à refroidir la pièce à une température inférieure à son point de fusion ; et à introduire une composition de revêtement thermodurci dans le moule fermé afin de recouvrir au moins une surface de la pièce. Le moule est ensuite ouvert et la pièce est retirée une fois que la composition de revêtement a au moins partiellement durci. L'invention concerne également un article moulé fabriqué au moyen dudit procédé.

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