Process for preparing a hollow rib-reinforcing laminated...

B - Operations – Transporting – 32 – B

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B32B 3/00 (2006.01) B29C 49/00 (2006.01) B32B 3/30 (2006.01) B32B 27/00 (2006.01) B32B 38/04 (2006.01) B65D 65/40 (2006.01)

Patent

CA 1041891

ABSTRACT OF THE DISCLOSURE A hollow, rib-reinforced, laminated article and a process for preparing the article are disclosed. The process comprises: (a) placing two sheets between opposing mold platens, the sheets being aligned such that the sheet surfaces oppose each other, at least one of the sheets being a thermoplastic material heated to its thermoforming temperature and at least one of the sheets being provided with grooves or integral projections which form fluid passageways, and at least one of the mold platens being proveded with a mold cavity to form a shaped article having ribs; (b) closing the mold platens to contact the sheets; and (c) introducing a fluid into the fluid passageways to distend the thermoplastic sheet into its mold cavity forming a shaped article having ribs, while the sheets maintain contact in the nondistended areas. The process is particularly useful in the preparation of laminated structures having an intricate design of sealed hollow portions.

198205

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