Many sponge foaming factories often encounter many difficulties in the production and manufacture of various sponges because of the poor technology. For example, sponge foaming is natural. If the sponge production technology fails to pass, it will undoubtedly increase the cost and competition pressure if the problem is not solved in time. Below

Sponge for your colleagues, or is preparing to do a new sponge foam factory to explain how to avoid the natural foam sponge problem.

1. Adjust the formulation, control water consumption should not exceed 4.5 phr, if necessary, use low boiling point liquid compound assistant foaming agent to replace part of water. Watch out for the amount of water in the formulation. Never exceed 5 portions. For low density sponges, the safety point of high temperature rise is 160 C, which must not exceed 170 C.

2. Strictly control the measurement accuracy of each component and reduce measurement errors. During the continuous production of massive sponges, attention should be paid to adjusting the material ejection speed of mixing head and the running speed of conveyor belt so as to make it harmonious. The phenomenon of underflow of non-starting material flowing into the bottom of starting material due to the slow speed or excessive ejection of conveyor belt should be avoided, so that the material can not normally start and fall, and the falling material is not easy to break out part of "gas seed", which forms. Part of the heat is accumulated, adding the risk of burning. In practice, if the process parameters are not adjusted properly, a small yellow coking line will appear at the bottom of the sponge.

3. The deformations of newly produced sponges should be avoided because the sponge network and sponge structure are affected by the contraction of external forces when it is not fully ripened. At the same time, the risk of sponge sponge spontaneous combustion is added to avoid heat accumulation due to contraction. Especially in the sensitive stage of sponge rising, any operation error codes and vibration, such as the rapid pulling movement of conveyor belt chain, excessive wrinkled barrier paper and the fluctuation of conveyor belt, will cause the deflation of sophisticated sponge and cause scorch.

4. Sponge manufacturers should pay close attention to the maturation and storage procedures of sponges. Regarding the production of polyurethane sponges, the maturation process of new sponges is the high incidence of fire accidents. Because the internal temperature of large sponges is high and the heat dissipation continues for a long time, it usually takes about 30-60 minutes to reach the highest internal temperature, and then begins to decline slowly within 3-4 hours or longer. During this period, new bubbles have been separated from the production line and entered into the simply neglected mature storage section. Without excellent monitoring methods, it will easily cause fire.

5. It has been reported that when using polyether polyols with molecular weight 5000, 4.7 phr of water and 8 phr of F-11 and isocyanate with TDI index of 1.07 to produce the sponge with this density of 22KG/cubic, a small amount of yellowish smoke was found after 2 hours, and the surface temperature of the sponge was not high, but the sponge was in a very dangerous initial stage of decomposition. The spontaneous combustion began at temperatures of 200-250 C. In order to avoid sponge sponge sponge sponge sponge sponge sponge, sponge manufacturer should store the newly produced sponge by ripening. When stacking, the sponge must not exceed three layers. The distance must be more than 1 meter. It is better to place the sponge alone. The ripening storage section should be equipped with full-time personnel to strengthen monitoring, such as measuring the internal temperature of sponges every 15 minutes, monitoring time at least 12 hours, or even longer, and then normal storage.

6. Regarding high temperature sponges that may occur, large sponges should be cut horizontally (e.g. thickness of 20CM) to facilitate the heat dissipation of sponges. When sponge smoke or spontaneous combustion is found, water spraying or lifesaving devices should be used to rescue the fire. Sponges should not be moved arbitrarily or doors and windows should be opened to avoid expanding the fire by increasing air flow rate.