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US 9,956,714 B2Granted
Method of producing a hollow body from thermoplastic material
AssigneeKautex Textron GmbH & Co. KG
InventorsMatthias Borchert, Klaus Gebert
Life of this patent
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Abstract
The invention relates to a method for producing hollow bodies from thermoplastic material comprising the shaping of at least one tubular preform or at least two two-dimensional, web-like preforms of plasticated thermoplastic material into a substantially closed hollow body, for example in the form of a fuel tank for motor vehicles.
Claims13
A method for producing a hollow body from thermoplastic material, comprising:
- providing at least one preform of thermoplastic material on a multipart blow molding tool,
- introducing the at least one preform into cavities of the blow molding tool,
- molding the at least one preform into shells within the blow molding tool,
- joining at least one insert to at least one shell of the shells within the blow molding tool, the insert defining a part-volume that is closed off with respect to a main-volume of the hollow body to be produced,
- joining together the shells by closing the blow molding tool,
- forming the hollow body with the insert enclosed within the hollow body between the shells,
- applying pressure to the main-volume enclosed by the hollow body, wherein a pressure equalization with the part-volume is brought about parallel to the pressure applied to the main-volume,
- wherein the pressure equalization takes place by the part-volume within the closed blow molding tool being connected initially for a time to the main-volume by at least one bypass line and by at least one inflation needle or an inflating mandrel, with which a wall of the insert and/or of the hollow body is pierced.
5 more elements
Dependencies are inferred from the claim text.