Factors affecting the shrinkage rate of rubber O-ring products

1. The shrinkage rate of rubber O-ring products increases with the increase of rubber seals content of vulcanized products 2. The shrinkage rate of the rubber seals O-ring product changes with the increase of the hardness of the vulcanized product into a saddle-shaped curve. 3. The shrinkage rate of rubber O-ring products increases with the increase of vulcanization temperature, and the shrinkage rate increases by 0.1% for every 10 degrees of temperature increase.—0.2% 4. The shrinkage rate of the rubber O-ring product increases with the increase of the injection amount of the raw material of the vulcanized product.>The product quality is 5%-10%, and the shrinkage rate is relatively stable 5. The shrinkage rate of the rubber compound in the calendering direction and the flow direction in the mold is greater than the shrinkage rate in the vertical direction. 6. The better the plasticity of the rubber seals compound, the smaller the shrinkage rate; the higher the rubber compound hardness, the smaller the shrinkage rate (except high hardness) 7. The more filler dosage, the smaller the shrinkage rate; the higher the glue content, the greater the shrinkage rate 8. For a mold with a porous cavity, the shrinkage rate of the vulcanized product in the middle cavity is larger than that of the vulcanized product in the edge cavity. 9. The shrinkage rate of injection molding vulcanized products is slightly smaller than that of molding vulcanized products 10. The shrinkage rate of thin products (section thickness less than 3mm) is 0.2% --- 0.6% larger than that of thick products (section thickness above 10mm) 11. The shrinkage rate of the circular section and the square section of the same specification is similar. 12. The more interlayer fabric, the smaller the shrinkage; qz"p9O(j4a6r+d.m 13. The shrinkage rate of rubber O-ring products lined with metal inlays is small, and shrinks in the direction of the metal inlays. 14. The expansion and contraction rate of rubber O-ring products fluctuates greatly. Ring sea surface products generally use one or two vulcanization. The first foaming vulcanization (and forming pores) mold cavity is reduced by about 60% according to the size of the product, and the second time is enlarged by 7%-10% according to the size of the product as a stereotype vulcanizate The material shrinkage rate is a changeable and extremely complex problem, and it is also a problem that the mold designer needs to consider carefully. At present, there is no real, complete and practical calculation formula, and it can only be estimated by experience By accumulating actual measurement data as a reference. Because even with a kind of rubber material, the same mold, under the same process conditions 3D Web Technology Forum: Q"p;_+v.z4S8Y(~ (if the vulcanization temperature is the same, the vulcanization pressure is the same, and the amount of raw material added is also the same) vulcanization, the obtained shrinkage rate is not the same, so the shrinkage rate of the product measured by the test is also an approximate value , In addition to the influence of factors such as product shape, hardness, molding process, etc., it is necessary to introduce a correction value on the average value of the measured shrinkage rate, and the correction direction is according to the above 1-14 point 2. Flash thickness and semi-finished product quality (The amount of raw material added), vulcanization pressure, rubber hardness, and mold structure are directly related. The higher the thickness, the thicker the product flash, the thickness of the flash should be taken into account when calculating the shrinkage in the mold opening direction for sheet products. 3. The size of the hot plate of the vulcanizer is larger than the size of the mold 1. The size of the mold should not be too much smaller than the size of the hot plate 2. The edge of the mold cavity should be within 70% of the size of the hot plate https://www.orksealing.com/
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