Sponge, a porous material with good water absorption, can be used to clean items. Commonly used sponges are made from wood cellulose fibers or expanded plastic polymers. Alternatively, there are natural sponges made from spongy animals, and most natural sponges are used for body cleaning or painting. In addition, there are three types of synthetic sponges made of other materials, namely low-density polyether (non-absorbent sponge), polyvinyl alcohol (highly absorbent material, no obvious pores) and polyester.
When the polyurethane sponge is foamed in large pieces, sometimes the surface will crack, and the length will appear sometimes on the side and sometimes in the middle. What is the reason? Here are some points for everyone For reference, welcome to smash bricks!
1. Increase the amount of tin catalyst while reducing the amount of amine. If it is appropriate to rule out the problem of silicone oil.
2. Increase the temperature of the drying tunnel and conveyor belt in the initial foaming area.
3. Check whether the speed of the side paper and the conveyor belt are synchronized, whether the height of both sides of the inclined plate is on the same horizontal line;
4. The edge lifting machine is well controlled, and the edge lifting film is lowered.
5. The above inspection points also need to be combined with factors such as material temperature, equipment, water metering pump, external force and surrounding environment.
