What causes polyurethane sponges to crack?

[暖葵終北]

Sponges are porous materials that are very absorbent and can be used to clean items. People commonly use sponges made from lignocellulosic fibers or foam polymers. There are also sponges made of sponges that are mostly 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 sponges), polyvinyl alcohol (super-absorbent material with no visible pores), and polyester. Polyurethane foam has a low density PU with a foam density of less than 18 kg\u002F microns and less than 3 microns. Usually, the method is that the amount of water is more than 4.5 parts (per 100 parts of polyol) and the amount of TDI is more than 55 parts. Heat dissipation from the foam is a significant problem.Konjac sponge company Since the heat in the foam is not easily dissipated, the temperature automatically rises above 180°C during foaming, leading to spontaneous combustion of the foam and creating a fire hazard.

Polyurethane foam

When polyurethane foam is foamed, it sometimes leads to cracking on the surface of the problem, sometimes on one side and sometimes in the center. What is the cause analysis?

1. Increase the amount of tin catalyst and reduce the amount of amine, e.g.karesponge properly exclude silicone oil.

2. Increase the temperature of the drying channel and conveyor in the foaming area.

3. Check whether the side paper and conveyor belt speed is synchronized, the height of the two sides of the ramp on the same level, assembly line drive and side drive is uniform. Synchronization, pay close attention to the foaming speed and transmission speed.

4. Lift the edge of the machine control is good, lift the edge of the film is lowered.

5. The above investigation point related also need to be carried out with the material temperature.bulk sponges for cheap Equipment. Water metering pump. External forces and the surrounding living environment and other factors.

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Do you know how polyurethane sponge is made?