Improvements in or relating to the production of rubber structures as for example sponge-like or cellular rubber upholstery

摘要

468,875. Cellular rubber; moulding by dipping. INTERNATIONAL LATEX PROCESSES, Ltd., MURPHY, E. A., TROBRIDGE, G. W., and WARD, A. N. June 2, 1936, No. 15318. [Classes 70 and 87 (ii)] Cellular rubber articles such as cushions are made by applying frothed or unfrothed dispersions of rubber, guttapercha, balata, or the like to a number of prismatic formers mounted in parallel relationship and so spaced that ribs or webs of dispersion are formed connecting the deposits on the formers, effecting coagulation vulcanizing and. stripping. Square, hexagonal or triangular formers, or combinations of shapes may be used. The spaces a left by the formers are capped over with rubber at one end, while the intermediate spaces b are open at both ends. A layer of deposit may be formed on each side of a temporary support, e.g. of paper surrounding the formers which is then carefully withdrawn and the deposit pressed on to the remainder before vulcanizing. Coagulation is effected by using heat sensitized dispersions and heated formers, or by first dipping the formers into coagulant and then into the dispersion, or by spraying the deposit with a coagulant such as a solution of acetic acid in alcohol. Synthetic rubbers, mineral rubber, factice, rape oil, vulcanized oils, cellulose esters or casein may be added to the dispersions as well as usual compounding ingredients. Specifications 290,313, 332,525, and 332,526, [all in Class 70], are referred to.