Plastic article or earthenware shaping or treating: apparatus – With interposed non-adhering web or sheet type parting means
Patent
1975-03-21
1977-02-01
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
With interposed non-adhering web or sheet type parting means
425224, 425329, 425449, 425817C, B29D 2704
Patent
active
040059588
ABSTRACT:
Apparatus and method are described for improved production of foamed bunstock in continuous length. A generally U-shaped moving mold is utilized within which a thermosetting foam mix is deposited and the bunstock is then formed as a continuous block. This moving mold is configured along a critical portion of its length to conform as closely as practical to the inverted mirror image of the profile defined by the characteristic curve of percent of foam rise as a function of time for any selected foam mix composition. A weir arrangement is employed to control the travel of foam mix while this is still highly liquid. The objective is to maintain a condition of hydrostatic balance throughout the body of developing foam from the point of mix lay down to the point of foam gellation. Features of the invention reside in the concept of and means for changing the weir configuration and mold profile to achieve that condition of operation in which various forces acting on and in the developing foam mix produce the aforesaid hydrostatic equilibrium. By so doing greater flexibility is achieved in terms of ability to adapt a given production installation to handle different foam compositions, production rates, bunstock dimensions and shapes, with better uniformity of foam density and cell isotropicity than heretofore commercially practical.
REFERENCES:
patent: 2404582 (1946-07-01), Bosomworth
patent: 3488800 (1970-01-01), Kornylak
patent: 3496596 (1970-02-01), Buff
patent: 3659981 (1972-05-01), Ferstenberg
patent: 3734668 (1973-05-01), Porter
patent: 3832099 (1974-08-01), Berg
Husar Francis S.
Rosenbaum Mark
The Upjohn Company
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