Reasons that affect the shrinkage rate of rubber O-ring products 1. The shrinkage rate of plastic O-ring products expands with the increase of rubber content of vulcanized rubber products?? 2. The shrinkage rate of plastic O-ring products is accompanied by the increase in the hardness of vulcanized rubber products, and the saddle-shaped curve changes?? 3. The shrinkage rate of plastic O-ring products increases with the increase of the temperature of the vulcanized rubber, and the shrinkage rate increases by 0.1% for every 10 degrees of temperature increase.—0.2%?? 4. The shrinkage rate of plastic O-ring products expands with the increase in the amount of dry material added to vulcanized rubber products.>The product quality is 5%-10%, and the shrinkage rate is relatively stable?? 5. 6. The shrinkage rate of the plastic pellet injection orientation and the fluidity angle in the mold shell exceeds the shrinkage rate of the vertical angle. The better the ductility of the plastic pellets, the smaller the shrinkage rate; the higher the hardness of the plastic pellets, the smaller the shrinkage rate (except high hardness)?? 7. The more the amount of filler used, the smaller the shrinkage rate; the higher the glue content, the greater the shrinkage rate?? 8. For the mold shell of the porous structure core, the shrinkage rate of the vulcanized rubber product of the center core is larger than the thermal expansion coefficient of the vulcanized rubber product of the edge core?? 9. The shrinkage rate of injection molding vulcanized rubber products is slightly smaller than the thermal expansion coefficient of molding vulcanized rubber products?? 10. The shrinkage rate of thin products (the thickness of the cross section is less than 3mm) is 0.2% --- 0.6% greater than the shrinkage rate of thick products (the cross section is more than 10mm)?? 11. The shrinkage rates of the circular cross-section and the square cross-section of the same specification and model are similar?? 12. The more interlayer fabric, the less shrinkage; qz"p9O(j4a6r+d.m?? 13. The shrinkage rate of the plastic O-ring products lined with metal material inserts is small, and the shrinkage rate of the products is close to the metal material inserts?? 14. The expansion of the plastic O-ring products at sea level is greater than the fluctuation of the shrinkage rate The scope is very large. The plastic O-ring sea level products generally use primary or secondary vulcanized rubber. The first polyurethane foam vulcanized rubber seals
(and formed into hair holes) mold shell molds are reduced by about 60% according to the product specifications, and the second press The product specification increases by 7%-10% as the shrinkage rate of the vulcanized rubber plastic pellets is a fickle and extremely complicated problem, and it is also a problem that stamping molders must consider carefully. At this stage, there is still no real, sound, The calculation method with practical significance can only be based on work experience or accumulated specific test data information as a reference. Because even if a plastic pellet is used, the same mold shell is used under the same processing technology standard. Exchange: Q"p;_+v.z4S8Y (for example, the temperature of vulcanized rubber is the same, the pressure of vulcanized rubber is the same, and the amount of dry material added is the same) vulcanized rubber, the shrinkage rate obtained is also different
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