PURPOSE:To obtain a transparent membrane main body having high strength, by compounding a small amount of a powdery vulcanizer and a powdery vulcanization promoting aid with natural rubber latex to suppress powdery additives as low as possible and adding a liquid vulcanization promoter and a liquid aging inhibitor to said latex to prepare a compounded solution and immersing mold in said solution to perform vulcanization and drying. CONSTITUTION:A compounded solution is prepared by adding 0.7-1.5pts.wt. of a powder vulcanizer, 0.2-0.5pts.wt. of a powdery vulcanization promoting aid, 0.5-1.0pts. wt. of a liquid vulcanization promoter and 0.5-1.0pts.wt. of a liquid aging inhibitor to 100pts.wt. of the rubber component of natural rubber latex. A mold is immersed in a coagulant and subsequently immersed in the compounded solution for about 30-60sec and slowly drawn up to adhere the natural rubber to the mold in a thickness of about 0.15-0.25mm and the rubber is dried at 80-90 deg.C for about 10min under heating and, after mouth binding, further vulcanized at 80-90 deg.C for about 20min under heating to form a membrane which is, in turn, demolded using a release powder. After the demolded membrane main body A is washed, said membrane main body is treated with a silicone emulsion to develop a transparent feeling and cut into a predetermined length at a mouth end part and an inflatable part 2 is provided to the tip of a fixing cylindrical part as the same body.
展开▼
