Continuous casting of a polymerizable composition between moving

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By casting liquids on a solid supporting or shaping surface

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Details

264213, 264300, 425371, B29D 702

Patent

active

040468500

ABSTRACT:
A continuous casting process and apparatus for a liquid polymerizable composition comprising a pair of endless belts which are arranged such that the lower run of the upper belt is disposed above the upper run of the lower belt and said runs are caused to move in the same direction at substantially the same speed; feeding a liquid polymerizable composition into a space defined between said runs; feeding at least one continuous gasket into said space, together with said composition, in such a manner that said gasket is passed between and in contact with the opposing surfaces of each of the opposite edges of said belts to provide a pair of seals which circumscribe said edges of the moving belts; subjecting said composition to partial polymerization to such an extent that the viscosity of said composition in terms of poise is within the range of 2 to 5 determined by a common logarithm of said viscosity at the temperature of polymerization; leading said partially polymerized composition in a path which is arranged such that said runs are curved at least twice through an inflection point and at the same time brought slightly closer together in response to the volume change of said composition during polymerization without causing the two opposing surfaces of said composition to depart from contact with the associated runs of the belts; and removing the resulting polymerized plate from the discharge end of the belts.

REFERENCES:
patent: 2500728 (1950-03-01), Williams
patent: 3371383 (1968-03-01), Hellsund
patent: 3376371 (1968-04-01), Opel et al.
patent: 3872197 (1975-03-01), Kato et al.
patent: 3876485 (1975-04-01), Kinlock et al.

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