Improvements relating to the manufacture of india rubber articles by extrusion

摘要

In the manufacture of rubber-cellulose threads, tubes, rods or the like by extrusion into a coagulant, viscose is mixed with colloidal sulphur, water-soluble accelerator and mineral matter such as zinc oxide, in a colloid mill in the absence of or with exclusion of air, the mixture being then incorporated with latex while excluding air. The viscose preferably contains 7 per cent by weight of cellulose, the resultant mixture containing 2 per cent of cellulose calculated on the dry rubber. The mixture can be pumped in gear type pumps as it does not deposit solids on the pump surfaces. Specification 7302/09, [Class 70], is referred to.ALSO:In the manufacture of rubber-cellulose threads, tubes, rods or the like by extrusion into a coagulant, viscose is mixed with colloidal sulphur, water-soluble accelerator and mineral matter, such as zinc oxide, in a colloid mill in the absence of or with exclusion of air, the mixture being then incorporated with latex while excluding air. The viscose preferably contains 7 per cent by weight of cellulose, the resultant mixture containing 2 per cent of cellulose calculated on the dry rubber. The mixture can be pumped in gear type pumps as it does not deposit solids on the pump surfaces. Specification 7302/09, [Class 70], is referred to.