Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Opposed registering coacting female molds
Patent
1996-09-06
1999-06-29
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Opposed registering coacting female molds
264252, 425127, 4251291, B29C 4514
Patent
active
059166002
ABSTRACT:
A high pressure mold assembly and method for holding a sheet of material such as glass while molding a gasket or other molded portion on the sheet from a thermoplastic or other moldable material such as PVC at high pressures of at least 2000 psi. The assembly and method provides an improved holding feature which reduces the percentage of broken sheets of material and yet controls the flash or overflow of the moldable material out of the mold cavity. The mold assembly includes a first mold section and a second mold section. The first mold section includes a first seal receiving surface which receives a first resilient seal while the second mold section has a second seal receiving surface which receives a second resilient seal. The seals engage and hold the sheet therebetween and accommodate variations in the sheet. Each of the seals is adapted to press and seal against the sheet for preventing the flow of the molten material along the sheet while under high pressure of between about 2,000 psi and 5,000 psi. The seals are each protected from the high pressure by a shoulder spacing the seal from the mold cavity. The shoulder is spaced from the sheet by a small gap preferably within the range of between about 0.007 and 0.013 inches. The method includes providing a high pressure injection mold assembly, the mold assembly having first and second mold sections and first and second resilient seals as described above. The sheet of material is held between the seals to avoid breakage and accommodate variations while the seals are protected by positioning them adjacent shoulders which prevent seal blow-out. Preferably, the seals are formed from urethane, polyethylene terephthalate or silicone rubber.
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Two sheets of drawings (A & B) showing a mold assembly used by the Assignee of the present invention to manufacture window assemblies which were sold by that Assignee more than one year prior to the filing date to the present application.
Athey Daniel Robert
Bloomfield Robert Edward
Boezwinkle William Keith
Craycraft Mark Allan
Dubay Steven Charles
Davis Robert
Donnelly Corporation
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