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Production process parameters and product quality defects related to the injection pressure, holding pressure, vulcanisation temperature, rubber content, vulcanisation time, etc. has a great impact on the demoulding. When the injection pressure is too high, the mould parts will produce elastic deformation and cause extrusion pressure. Holding time is too long, the pressure inside the mould cavity increases, which will cause shear force and molecular orientation stress to increase. At the same time, holding pressure injection force is too high, too long, but also cause the process of filling, resulting in greater internal stress, will also cause deformation of the mould parts or produce a flying edge between the mating surfaces, making it more difficult to release the mould. Vulcanisation temperature, rubber content rate, vulcanisation time and rubber shrinkage, high temperature vulcanised rubber is easy to produce the phenomenon of return to the original, the rubber vulcanised shrinkage, and vice versa, the shrinkage is small. The higher the rubber content of raw rubber. The higher the contraction of raw rubber, the greater the rubber content is lower, the smaller the shrinkage of vulcanisation time is longer, the degree of crosslinking, shrinkage is small vulcanisation time is short, the degree of crosslinking time is small, shrinkage is large from the process, under-vulcanisation or over-vulcanisation shrinkage is large, only in the vulcanisation point when the contraction of the smallest shrinkage is large, on the core, the inserts of the complex structure of the mould to produce a large holding force is also not conducive to the product of the demoulding.
