Process conditions have a certain influence on the shrinkage rate of PU elastomers, and the influence of temperature is the most significant; the structure of the product itself has a greater influence on the shrinkage rate, and the PU elastic system is mainly caused by different flow paths; environmental factors It is a late-stage influencing factor, and their changes are the main factor that causes fluctuations in the shrinkage rate. So what is the change law of the shrinkage rate of PU elastomer? Let's share with you from the PU pigment manufacturer below.
1) Increase with the increase of mold temperature;
2) It changes in a zigzag shape with the extension of the curing time;
3) Decrease with the increase of ambient temperature;
4) Fluctuates with the increase of environmental humidity;
5) Different mold structures have different resistance to shrinkage, with the smallest longitudinal direction and the largest transverse direction;
6) Before a certain length, the shrinkage rate increases with the increase of the flow path length, after a certain length, the shrinkage rate decreases with the increase of the flow length.