Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1997-10-16
1999-12-28
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 468, 264244, 264266, 264511, B29C 4406, B29C 4516
Patent
active
060077484
ABSTRACT:
In methods and apparatus for the production of molded laminated articles a thin layer of a first moldable heat curable material is placed in the mold cavity of a heated mold and thereafter a second polymerisable material is injected to fill the remainder of the cavity, so that the materials are in intimate contact and form the laminate. The polymerisation of the second material is exothermic and the curing of the first material is facilitated by heat from this reaction. Preferably the second material is also foamable and the foaming generates pressure that molds the first material against the mold surface while it is being cured. Preferably the layer of first material is brought in contact with the mold surface, and air that would otherwise be trapped between them, is removed by drawing a vacuum between the layer and the surface. A preferred first material is epoxidised bondable uncured vulcanisable rubber and a preferred second material is foamable polymerisable polyurethane. The resultant article may be a laminated footwear sole in which the cured layer of first material constitutes an outer tread layer of the sole with the polymerised polyurethane constituting the remainder of the sole. Such a sole may be attached to the remainder of the boot or shoe by the molding operation. Apparatus for molding the laminated articles comprise a mold with one or a plurality of passage means passing through the mold and having respective outlets at the surface against which the article is to be molded, and means for drawing a vacuum at the outlets.
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