Blow molding process

Details Blow molding process Blow molding process

B - Operations, Transporting

29

C

18/509

B29C 49/46 (2006.01) B29C 49/66 (2006.01)

Patent

CA 1245410

ABSTRACT OF THE DISCLOSURE In producing hollow bodies by blow molding from thermo- plastic material, a preferably tubular preform is firstly formed, and is then expanded within the blowing mold under the effect of an inert gas under high pressure, until it bears entirely against the inside surface of the blowing mold. There- after, a reaction gas such as fluorine is introduced into the hollow body under a considerably lower pressure, while the hollow body is still in the mold, to treat the internal surface of the hollow body to render it impervious to gas and/or liquid. After the reaction has elapsed, a flushing and cooling gas is introduced into the hollow body and is then removed from the blowing mold after the hollow body has sufficiently set.

491693

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