Process for the production of hollow bodies of thermoplastic...

B - Operations – Transporting – 29 – C

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B29C 49/20 (2006.01) B29C 51/12 (2006.01) B29C 69/00 (2006.01) B29C 49/04 (2006.01)

Patent

CA 2654106

The invention concerns a process for the production of hollow bodies of thermoplastic material, in particular a process for the production of fuel tanks of plastic material. In the process according to the invention preforms in web or band form of plasticised plastic material are shaped in a multi--part tool forming a mould cavity by expansion of the preforms and causing them to bear against the internal contour of the mould cavity. The process firstly includes the production of two mutually complementary intermediate products in the form of shell portions. Then respective built-in fitment components are secured to the respective insides of the shell portions, which face towards each other in the installation position, wherein at least some built-in fitment components of mutually complementary shell portions are respectively of mutually complementary configuration, in the sense that they can be joined to provide an assembled component or to provide a functional unit. The shell portions are assembled in such a way that the mutually complementary built-in fitment components engage into each other and/or come into operative connecting relationship with each other.

L'invention concerne un procédé permettant de produire des corps creux (12) en thermoplastique, notamment un procédé pour produire des réservoirs de carburant en plastique. Selon ledit procédé, des ébauches (8) en matière plastifiée, sous forme de feuilles continues ou de bandes, sont déformées dans un outil de formage en plusieurs parties (2a, 2b, 2c) formant une cavité de moule, par élargissement et adaptation des ébauches au contour intérieur de la cavité de moule. Selon l'invention, il est prévu de produire deux produits intermédiaires sous forme de coques (10a, 10b), complémentaires l'un de l'autre. Des pièces d'insertion (7), qui se font mutuellement face, en position pontée, sont ensuite fixées sur les faces intérieures des coques. Au moins certaines pièces d'insertion de coques mutuellement complémentaires sont conçues, dans chaque cas, de manière mutuellement complémentaire, de sorte à pouvoir être réunies pour former un élément assemblé ou une unité fonctionnelle. Les coques sont assemblées de manière que les pièces d'insertion complémentaires s'interpénètrent et/ou entrent mutuellement en interaction.

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