Method for producing a plastic molded part, and injection-molding machine
AssigneeFerromatik Milacron GmbH
InventorsSven ENGELMANN, Rüdiger SAUM, Thorsten THÜMEN
Life of this patent
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Abstract
The production of a plastic molded part utilizes a barrier layer embedded in plastic. Plastic is injection-molded successively in different cavities of the injection mold onto a three-dimensional preform made from a cut of a multi-layer barrier film, which multi-layer barrier film comprises a barrier layer coated with plastic on both sides. The plastic coating of the barrier film cut is at least superficially melted by the injected plastic melt. And the preform is supported by a support formed on the corresponding partial mold on the respective opposite side.
Claims15
A method for producing a plastic molded part, which has a barrier layer embedded in the plastic, the method comprising:
- making available a three-dimensional preform from a cutout of a barrier film, which film comprises a barrier layer coated on both sides with plastic material;
- laying the preform into a first cavity of the open tool of an injection-molding machine, comprising a first and a second sub-tool (7, 8);
- closing the tool, causing the preform to lie against a support surface of the first sub-tool (7) with its first side and a first empty space to remain on its second side;
- injecting plastic melt into the first empty space, with the plastic coating of the barrier film cutout that faces the first empty space being at least superficially melted by the injected plastic melt;
- opening the tool;
- removing the formed injection-molded part from the first cavity and introducing the injection-molded part into another cavity of the tool;
- closing the tool, causing the injection-molded part to lie against a support surface of the second sub-tool (8) with one side and a second empty space to remain bordering on the side of the injection-molded part formed by the second side of the preform;
- injecting plastic melt into the second empty space, with the plastic coating of the barrier film cutout that faces the second empty space being at least superficially melted by the injected plastic melt;
- opening the tool;
- removing the molded part from the tool.
An injection-molding machine comprising:
- two mold mounting plates (1, 3) that can be moved relative to one another,
- a closing unit,
- a turning unit (9) disposed between the mold mounting plates, and
- at least two injection units, wherein the two mold mounting plates carry a first and a second sub-tool (7, 8) and the turning unit comprises a third sub-tool (14), which can be rotated about an axis of rotation (15) oriented parallel to the closing axis (2) and comprises multiple cavities (18) disposed around the axis of rotation and structured to be the same, which cavities, when the tool is closed, delimit differently structured cavities together with the first and the second sub-tool (7, 8), wherein the cavities of the third sub-tool (14) can be charged, in one position (A) of the third sub-tool, by an injection unit assigned to the first mold mounting plate (1), through the first sub-tool (7), and, in a different position (B) of the third sub-tool (14), by an injection unit assigned to the second mold mounting plate (3), through the second sub-tool (8).
Dependencies are inferred from the claim text.