Method of producing coated molded plastic articles, and injection mold
AssigneeKrauss-Maffei Kunststofftechnik GmbH
InventorBernd Klotz
Life of this patent
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Abstract
A method of producing a composite plastic molded article having at least one layer of web material and a plastic body, includes placement of the web material between mold halves of an injection mold and deforming the web material through closing of the mold. Subsequently, negative pressure is applied on one side of the web material and/or excess pressure is applied on its other side, so that the web material bears upon a mold half. Plastic mass is then introduced into the opening mold in such a way that the feed rate of the plastic mass and the opening speed of the injection mold are coordinated with each other. Once a certain opening gap has been reached, the mold is closed and the plastic article is embossed.
Claims20
A method of producing a composite molded plastic article having at least one layer of a web material and a layer of a plastic mass, comprising the steps of:
- a) placing a thermally insulated web material between confronting mold halves of an injection mold;
- b) closing the injection, mold, thereby deforming the web material;
- c) applying at least one pressure selected from the group consisting of negative pressure on one side of the web material and positive pressure on the other side of the web material;
- d) introducing plastified plastic mass at a feed rate via an injection point into a cavity of the injection mold and simultaneously opening the injection mold at an opening speed until reaching a predetermined position, whereby the feed rate of the plastic mass and the opening speed of the injection mold are coordinated with one another;
- e) maintaining a fixed opening gap between the confronting mold halves of the injection mold and continuing to feed plastic mass into the mold cavity;
- f) closing of the injection mold to form a finished plastic article;
- and
- g) removing the plastic article.
A method of producing a plastic article, comprising the steps of:
- a) placing a thermally insulated web material, having a front side and a back side, between confronting mold halves of an injection mold;
- b) moving the web material by one of the mold halves towards the other one of the mold halves, thereby pre-forming the web material between confronting inner wall surfaces of the mold halves;
- c) holding the web material with the front side against the inner wall surface of the other mold half;
- d) introducing a plastic mass to the back side of the web material and simultaneously moving the one mold half away from the other mold half to a predetermined position to maintain a fixed gap between the confronting mold halves of the injection mold for migration of the plastic mass and adhesion of the plastic mass to the back side of the web material;
- and
- e) and further comprising the step of moving the one mold half toward the other mold half to thereby fully close the injection mold to form a finished plastic article.
Dependencies are inferred from the claim text.