Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1981-10-13
1983-06-14
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
249127, 264137, 264313, 425406, 425DIG14, 425DIG44, B29D 302, B29C 112, B29C 102
Patent
active
043882633
ABSTRACT:
Fiber reinforced thermoplastic resin composites are molded and cured in a system using controlled elastomeric tooling to apply molding pressure only after temperature has been increased to a selected point. A composite material to be molded and cured is typically placed between a fixed mold surface and a movable reaction block. A container is mounted on a fixed support behind the block in a manner permitting movement toward the block. The container has an interior base generally parallel to the block and an upstanding edge extending toward the block. A pad of an elastomeric material having a positive coefficient of thermal expansion is retained in the container by the edges. The pad extends beyond the edges into contact with the block. A gap of selected size lies between the pad and the container base. As the assembly is heated during molding, the pad expands into the gap without exerting significant pressure on the block. As heating continues, the gap becomes filled and the pad expands against the block exerting the selected molding pressure at the selected temperature. Adjustment means are provided permitting uniform molding pressures and pressure application temperatures over a large number of pads in complex mold assemblies despite variations in pad dimensions, age, etc.
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Duncan John R.
General Dynamics Corp./Convair Division
Hoag Willard E.
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