Method for producing a plastic article and blow molding tool
A technology of blow molding, plastic products, applied in the direction of household appliances, other household appliances, applications, etc.
Active Publication Date: 2015-01-14
考特克斯机械制造有限公司
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- Abstract
- Description
- Claims
- Application Information
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
Method used
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Embodiment Construction
[0050] The separation of the preformed tube 2 can, as in the illustrated embodiment, be performed outside the extrusion head after or during the exit of the preformed tube 2 from the extrusion head 1 or from an annular gap nozzle not shown. Alternatively, the separation of the preformed tube 2 can also be carried out inside the extrusion head 1 with a flow divider arranged there.
[0051] Finally, also alternatively, the preformed tube 2 can first be discharged over its entire length and then separated by means of grippers and separating devices.
[0052] In the illustrated embodiment it is provided that the preformed tube 2 is removed from the extrusion head 1 by means of the gripper 5 and transferred to the blow mold 6, as image 3 shown schematically.
[0053] The clamp 5 is shown very simplified in the figures. The clamp does not have to have a circular segment-shaped clamping element, but it can have a clamping section arranged approximately on a circular arc or polygon...
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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 preform, 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 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 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...
Claims
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IPC IPC(8): B29C49/18B29C49/20B29C49/48B29C49/04B29C49/42B29C49/58B29C69/00B29C48/09B29C48/10
CPCB29C2793/0063B29C2049/2073B29C49/18B29L2031/7172B29C49/4802B29C2793/0081B29C49/20B29C2049/2008B29C49/4817B29C49/58B29C47/0026B29C47/0066B29C49/4242B29C47/0023B29C49/04B29C2049/4851B29C2049/4807B29C47/0054B29C2049/622B29C48/09B29C48/10B29C48/0017B29C48/0022B29C49/4205B29C49/04118B29C49/42067B29C49/42422B29C2049/6091B29C49/30B29D22/003
Inventor V·海姆A·利希特瑙尔J·莫伊茨海姆S·瓦尔布勒尔
Owner 考特克斯机械制造有限公司