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US 5,882,559 AGranted
Process for injection molding objects having at least two different layers
AssigneeBattenfeld GmbH
InventorsHelmut Eckardt, Hermann Plank, Harald Bleier
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AssigneeBattenfeld GmbH
InventorsHelmut Eckardt, Hermann Plank, Harald Bleier
Estimating the term…
A process for the injection molding of objects having an outer layer of enamel and an inter layer of a plastic material is disclosed. According to the process, a liquid enamel is used. This enamel is injected by an enamel-injection apparatus through an enamel-injection die. A plastic melt passes through an injection unit into the cavity. According to the invention, the liquid enamel is injected into the flow path of the melt in the region before the cavity, before the melt is injected, so that the melt is encased by enamel before it is distributed in the cavity. Variations are also disclosed. For example, the form can be filled with enamel and the excess enamel drained. Then, the melted plastic material is introduced into the injection molding form. Also, the form can filled and then the capacity of the form increased to accommodate the melted plastic material. In any case, it is possible to use liquid enamels to enamel injection molded parts in the tool or form. Furthermore, the inventive process makes possible a rapid and therefore economical mode of operation.
A process for injection molding objects having at least two different layers with an injection molding device including an injection molding tool having a cavity serving as a form for the objects, at least two enamel-injection dies through which components of a liquid enamel are injected into the cavity of the injection molding tool, and a plastic injection unit for introducing a melted plastic material into the cavity of the injection molding tool through a plastic-injection die, the process comprising:
A process for injection molding objects having at least two different layers with an injection molding device including an injection molding tool having a cavity serving as a form for the objects, at least one enamel-injection apparatus for injecting a liquid enamel into the cavity of the injection molding tool through at least one enamel-injection die, and a plastic injection unit for introducing a melted plastic material into the cavity of the injection molding tool, the process comprising:
A process for injection molding objects having at least two different layers with an injection molding device including an injection molding tool having a cavity serving as a form for the objects, at least one enamel-injection apparatus for injecting a liquid enamel into the cavity of the injection molding tool through at least one enamel-injection die, and a plastic injection unit for introducing a melted plastic material into the cavity of the injection molding tool, the process comprising:
Dependencies are inferred from the claim text.