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1, rubber calendering direction and the direction of flow in the mould shrinkage is greater than the vertical direction of the shrinkage, the longer the flow distance, the greater the shrinkage.
2, the more semi-finished products are loaded into the mould cavity, the higher the density of the products, the smaller the shrinkage rate.
3, porous cavity of the mould, the middle cavity pressed out of the product shrinkage than the edge of the cavity pressed out of the product shrinkage is smaller.
4, the injection method of moulding products shrinkage is slightly smaller than the general moulding method pressed products shrinkage.
5, the shrinkage of thin products than thick products shrinkage rate of 0.2% -0.6%.
6, general rubber products shrinkage with the products of the inner and outer diameter and cross-section of the increase and decrease.
7, cotton cloth by coating rubber and rubber layered lamination of the shrinkage of the sandwich products, generally in the 0-0.14%, the more the sandwich layer, the smaller the shrinkage, the fabric for the polyester line of the products of the vulcanisation of the shrinkage rate of 0.4%-1.5%, containing nylon silk, nylon fabric products of the vulcanisation of the shrinkage rate of the general in the 0.8 per cent -1.8 per cent.
8, containing metal and other hard inserts of rubber products parts vulcanisation shrinkage is small, and to the geometric centre of the insert shrinkage, shrinkage is generally 0-0.4%.
9, hard rubber content in 20% or so, the vulcanisation shrinkage rate of the product parts is about 1.5%.
10, rubber and plastic products with the contraction rate is generally 1.1% - 1.6%, about 0.1% - 0.3% smaller than similar rubber products.
2, the more semi-finished products are loaded into the mould cavity, the higher the density of the products, the smaller the shrinkage rate.
3, porous cavity of the mould, the middle cavity pressed out of the product shrinkage than the edge of the cavity pressed out of the product shrinkage is smaller.
4, the injection method of moulding products shrinkage is slightly smaller than the general moulding method pressed products shrinkage.
5, the shrinkage of thin products than thick products shrinkage rate of 0.2% -0.6%.
6, general rubber products shrinkage with the products of the inner and outer diameter and cross-section of the increase and decrease.
7, cotton cloth by coating rubber and rubber layered lamination of the shrinkage of the sandwich products, generally in the 0-0.14%, the more the sandwich layer, the smaller the shrinkage, the fabric for the polyester line of the products of the vulcanisation of the shrinkage rate of 0.4%-1.5%, containing nylon silk, nylon fabric products of the vulcanisation of the shrinkage rate of the general in the 0.8 per cent -1.8 per cent.
8, containing metal and other hard inserts of rubber products parts vulcanisation shrinkage is small, and to the geometric centre of the insert shrinkage, shrinkage is generally 0-0.4%.
9, hard rubber content in 20% or so, the vulcanisation shrinkage rate of the product parts is about 1.5%.
10, rubber and plastic products with the contraction rate is generally 1.1% - 1.6%, about 0.1% - 0.3% smaller than similar rubber products.
