Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1988-06-15
1990-10-09
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 407, 264 454, 264 51, 264248, 264251, 264261, 2643287, 2643288, 26432815, 15624422, 425114, 425123, 4251291, 425144, 425145, 425548, 425549, 425562, 425566, B29C 4513, B29C 4520, B29C 4576
Patent
active
049618954
ABSTRACT:
Process and apparatus for the manufacture of integral roller door structures of any desired length and width, and comprising longitudinally juxtaposed slats separated by integral hinge formations. Such a structure having slats of any desired length can be produced by a semi continuous moulding process in which a molten plastics material and a foaming agent are injected into a mould, the part of the structure so formed being allowed to solidify before removing the solidified structure partially from the mould, then closing mould about the remaining portion of the structure, thereafter moulding a further part of the structure within the mould onto the remaining portion of the previously moulded part and repeating the cycle as often as required. A product of any desired width, measured transversely to the salts, can be produced by welding, edge-to-edge a plurality of lengths of the product produced by the moulding technique, by means of an apparatus incorporating a heated knife which is advanced along the gap between opposing edge faces of the lengths of moulded structure to be welded, to fuse the material of said opposing faces, and further incorporating an extruder which follows the knife and injects molten plastics into said gap to unite with the plasticized opposing edge portions and form a uniform weld, the temperatures of the knife and the extrudate being independently controllable to prevent, substantially, distortion of the product being produced by the welding step.
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