GB572030A - Improvements in or relating to the coagulation of aqueous dispersions of rubber and rubber-like materials and apparatus therefor - Google Patents

Abstract

572,030. Coagulating rubber. DUNLOP RUBBER CO., Ltd., TAYLOR, S. D., MADGE, E. W., and MURPHY, E. A. Feb. 15, 1944, No. 2762. [Class 70] Coagulating rubber.-Rubber-like material is coagulated from rubber latex, or from aqueous dispersions of rubber-like polymers, by continuously introducing a sheet-like stream of the dispersion substantially normally into a stream of coagulant, the two streams having the same width, permitting the mixture to flow together until the coagulum agglomerates, and continuously separating the coagulum from the liquid. Coagulant is delivered by a nozzle 2 having a rectangular cross-section on to a shoot 3 of the same width, the nozzle being inclined at a small angle to the shoot to prevent turbulence. The dispersion is fed to the coagulant through a rectangular nozzle 5 of the same width as the shoot 3, substantially at right angles thereto, and situated sufficiently above the coagulant stream, and distant from the nozzle 2 to prevent a build-up of coagulum. The rate of flow of the coagulant and dispersion are preferably the same. The mixture flows from the shoot 3 into a wider channel 6 down a. slope 7 on to the base 8 of such length and inclination to the horizontal that agglomeration is complete at the outlet. At the commencement of an operation, a plate 9 in grooves 10 ensures an initial accumulation of coagulum. Thereafter, the plate 9 is removed and the coagulum and liquid flow from the channel 6 on to a conveyer moving at such a rate that the sheet of coagulum is neither stretched nor buckled.