Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1974-01-30
1976-03-02
Annear, R. Spencer
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
299141, 264 51, 264102, 425812, 425817R, B29D 2700
Patent
active
039415287
ABSTRACT:
Heat-expandable beads of thermo-plastic material such as polystyrene are moulded by steam heating in a metal mould and venting the interior of the mould through apertures in plugs set into ports in the wall of the mould. The plugs are made of low heat conductivity material, for example nylon, to prevent the apertures being blocked by fusion of the beads in contact with the plugs due to heat conduction from the wall of the mould. The steam may be introduced into the mould through apertures in nylon plugs set in ports in the wall of the mould, the low heat conductivity of the nylon preventing the steam raising the plugs to a temperature at which the beads would burn onto the plugs. The same plugs may be used to introduce steam into the mould and then vent the interior of the mould.
REFERENCES:
patent: 2354433 (1944-07-01), Carter
patent: 2707802 (1955-05-01), Gard
patent: 2765494 (1956-10-01), Weingart
patent: 3377662 (1968-04-01), Fukushima
patent: 3555620 (1971-01-01), Bucy
patent: 3737266 (1973-06-01), Yamamoto
patent: 3803277 (1974-04-01), Bassett
patent: 3803281 (1974-04-01), Fix
Annear R. Spencer
Rosenbaum Mark
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