Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1974-10-23
1976-08-10
Camby, John J.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
34 57A, 34 57B, 34181, 34182, 34187, 264 51, 264DIG9, B29B 300
Patent
active
039738841
ABSTRACT:
A method and apparatus are disclosed for the manufacture of foamed polystyrene particles of moderately great density, such as 3 to 25 lbs. per cubic foot (50 to 400 milligrams per cubic centimeter). Beads are fed by a constant-displacement auger to an expander vessel having the form of, in its lowest part, a cylinder with a vertical axis, and thereabove, of a frustrum of an inverted cone having a base angle of about 83.degree. to 70.degree.. Steam is supplied to the vessel in an appropriate, controlled manner. The vessel also contains stator bars, to break lumps and retard the rotation of the material in the vessel, and rotating bars, to provide the necessary agitation. Desirably, the equipment includes a discharge chute of adjustable location, to facilitate adjustment of the residence time and consequently of the density of the expanded beads being produced. With apparatus according to the invention, it is possible to obtain beads substantially uniformly expanded to a desired density within the range indicated above. Such higher-density expanded polystyrene particles find use in various applications, such as shoe soles, or as a substitute for wood.
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patent: 3040438 (1962-06-01), Perlman et al.
patent: 3207820 (1965-09-01), Scarvelis et al.
patent: 3252228 (1966-05-01), Ehrenfreund
patent: 3617038 (1971-11-01), Schmidt et al.
BASF Wyandotte Corporation
Camby John J.
Dunn Robert E.
Linkhauer John W.
Schwartz Larry I.
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