Blow moulding multiple walled articles

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 49/24 (2006.01) B29C 49/00 (2006.01) B29C 49/02 (2006.01) B29C 49/20 (2006.01) B29C 49/42 (2006.01) B29C 49/04 (2006.01)

Patent

CA 2049968

21 ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for producing a hollow article having a plurality of spaced generally concentric walls extending from a common neck. To produce the article, a preformed inner vessel defining the inner wall and neck is juxtaposed with a mouldable sheet extrusion. Split mould segments are closed around the extrusion to form a substantially sealed parison therein with an annular portion of the parison extending closely around the neck of the inner vessel. Fluid pressure medium is introduced via conduit into the space between the inner vessel and the parison to blow mould the outer wall against the moulding surfaces of the mould segments. During the blow moulding, the interior of the inner vessel is pressurized with fluid pressure medium via conduit to prevent its deformation.

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