Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1990-10-31
1991-11-12
Dawson, Robert A.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264102, 264235, 264327, 26432818, B29C 4573
Patent
active
050645854
ABSTRACT:
Rigid mouldings, e.g. kitchen sinks, having a wall thickness generally not exceeding approximately 0.4in (10 mm) are produced by a process in which pre-heated and de-gassed curable resin composition, which sets within 60 minutes, is supplied under at least 4 psi (280 g/cm.sup.2) pressure to fill a hotter mould and thereafter until the composition in the mould has set so as to compensate for shrinkage. The composition temperature is controlled in the mould to maintain a substantially linear temperature gradient in the composition increasing from its entry into the mould for the composition to set progressively through the mould back to the entry. Preferably the composition includes an epoxide resin, an anhydride hardener and a mineral filler, and the temperature gradient is approximately 10.degree. C. Typically using a solid system composition maximum pre-heated mould temperature is 170.degree. C., the composition is supplied at 90.degree.-120.degree. C. at 15 psi (1050 g/cm.sup.2) and the moulding is removed in under 30 minutes for heat treatment. Using a liquid system composition maximum pre-heated mould temperature is typically 120.degree.-160.degree. C. and composition is supplied at about 50.degree. C.
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Cooper Royston B.
Leak Jonathan G.
Dawson Robert A.
Glynwed Consumer & Building Products Limited
Kuhns Allan R.
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