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What are the reasons that affect the shrinkage rate of rubber O-ring products?

Update:18-10-2021
Summary:

The fundamental reason that affects the shrinkage rate […]

The fundamental reason that affects the shrinkage rate of rubber O-ring products:
1. The shrinkage rate of rubber O-ring products increases with the increase in the rubber content of vulcanized rubber products.
2. With the improvement of the compressive strength of vulcanized rubber products, the shrinkage rate of rubber O-ring products has become a saddle trend chart.
3. The shrinkage rate of rubber O-ring products increases as the temperature of vulcanized rubber increases. Each increase of 10 degrees, the shrinkage rate increases by 0.1%-0.2%.
4. The shrinkage rate of rubber O-ring products increases with the increase in the introduction of vulcanized rubber products. When the mass of pellets is 5%-10%, the shrinkage rate is relatively stable.
5. The shrinkage rate of the rubber raw material in the mold shell along the injection processing direction and the flow direction exceeds the shrinkage rate along the vertical direction.
6. The better the plastic deformation of the rubber plastic pellets, the smaller the shrinkage rate; the higher the compressive strength of the compound, the smaller the shrinkage (in addition to high wear resistance).
7. The more filler consumption, the smaller the shrinkage; the higher the rubber composition, the greater the shrinkage.
8. For mold shells with a porous material cavity, the shrinkage rate of the vulcanized rubber product in the middle cavity exceeds the shrinkage rate of the vulcanized rubber product in the edge cavity.
9.The shrinkage rate of the introduced molded vulcanized rubber product is slightly lower, and the shrinkage rate of the molded vulcanized rubber product is reduced.
10.The shrinkage rate of thin products (the cross-section thickness is less than 3 mm) is 0.2%-0.6% higher than that of thick products (the cross-section thickness exceeds 11 mm).
11.The shrinkage rate of the circular and square cross-sections of the same model and specification is similar.
12. The more laminated cotton fabric, the smaller the shrinkage rate.
13. The rubber O-rings lined with metal composite material inlays are gathered smaller and are gathered to metal composite material inlays.
14. The fluctuation range of the expansion and contraction rate of rubber O-ring horizontal plane products is very large. General rubber O-ring horizontal products use primary vulcanized rubber or secondary vulcanized rubber. The mold core of the first foamed polyurethane vulcanized rubber (and causes sweat pores) is reduced by about 60% according to the product specifications and models. As a type of vulcanized rubber, the shrinkage rate after increasing by 7%-10% according to the product specifications and models is plastic and extremely complicated difficulty.

 

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