Stock material or miscellaneous articles – Sheet including cover or casing – Foamed or expanded material encased
Patent
1981-02-26
1983-06-28
Woo, Jay H.
Stock material or miscellaneous articles
Sheet including cover or casing
Foamed or expanded material encased
264515, 264173, B29D 702, B32B 314
Patent
active
043905811
ABSTRACT:
Articles are blow moulded from thermoplastic polymeric materials containing high proportions of fillers such as glass fibres. The method comprises extruding the filled polymeric material through a die having a mandrel for constraining the material into a tubular shape; coextruding between the die and the outer surface of the material, a liquid having a freezing temperature lower than that of the material; cooling the liquid and the outer surface of the material during their passage through the die to a temperature below the freezing temperature of the material but above the freezing temperature of the liquid while maintaining the inner surface of the material molten; squeezing the extrudate at suitable intervals to fuse the molten inner surface together and thereby seal discrete lengths; and inflating the sealed lengths to conform to a surrounding mould to produce laminar shapes which are then foamed-filled to give stiff panels.
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Cogswell Frederic N.
Mitchell David T.
Imperial Chemical Industries Limited
Woo Jay H.
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