Method for producing a plastic article and blow molding tool

Abstract

The invention relates to a method for producing a plastic article and a blow molding tool for performing the method. The method comprises extruding an approximately tube-shaped perform (2), dividing the melt flow within the extrusion head or separating the extrudate exiting or already exited from the extrusion head, such that a preform having an approximately C-shaped cross section is obtained, forming the preform into a hollow part within a multipart blow molding tool (8) using differential pressure, wherein an expansion and partial preforming of the preform first takes place with the blow molding tool partially closed, then in a further step at least one insert (18) is inserted into the interior of the partially preformed article between the not completely closed blow molding tool and through the open side of the preform, and in a further step the blow molding tool is completely closed, wherein the article is completely formed, forming at least one at least partially circumferential pinch-off seam.

Description

Background technique [0001] Especially when producing large plastic containers by extrusion blow molding, it is often desirable to place inserts into the finished container. For example, fuel containers made of thermoplastics for motor vehicles are often provided with functional inserts or inserts which pass through one or more The correction opening is inserted manually, or is encapsulated together by extrusion blow molding during the shaping of the container. For this purpose, it is known to place the insert to be placed in the container on the mandrel (Dorn) / support and to arrange it between the open halves of the blow mold in such a way that the extrusion through the blow mold A preformed tube made of thermoplastic material is extruded on the support and on the components arranged on the support. In this case, the tube is rolled over the functional component carrier and the functional component. The mold halves of the blow mold are then closed around the support and the...

AI Technical Summary

Problems solved by technology

[0002] Especially in the case of fuel containers made of thermoplastics there is the problem that the plastic used for this (usually HDPE) is not diffusion resistant for hydrocarbons

[0006] This method is relatively advantageous especially in terms of providing space for handling the inserts, but is required for guiding the extrudate in the form of webs or strips which is still thermoplastic high cost of equipment

Furthermore, the use of this method is limited to spatially fixed arrangements of the extrusion head relative to the blow mold

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