Foam box processing equipment causes part of the hollow inside the foam during the manufacturing process of the highly elastic polyurethane foam, which is caused by the imbalance of gel to foam ratio.
In the final stage of foaming to generate a large amount of gas, the wall of the bubble film is very viscous, but the elasticity is insufficient. If the gas in the bubble continues to increase, it cannot withstand the elongation of the film wall. With a large amount of gas, the wall of the foam film may rupture, which may cause the foam box to become empty or rupture, which may cause the entire foam to collapse.
The problem usually faced in this case is that the foam box processing equipment increases the amount of gel catalyst in the raw material or reduces the amount of foam catalyst, stabilizes the gel and the foaming rate balance, and bubbles when a large amount of gas is generated Walls can increase strength. Thereby, the hollow phenomenon of the foam can be avoided.