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Polyurethane sandwich board-FAQ and Solution
The black line of foam under the normal use is caused by the mixing pressure of the equipment. With the increase of working hours, the fluctuation of the mixing pressure o
1. Black line of board foam
The black line of foam under the normal use is caused by the mixing pressure of the equipment. With the increase of working hours, the fluctuation of the mixing pressure of the equipment causes uneven mixture of black material and white material, which results in the black line of the foam.
2. Cracking of foam
Due to overall curing speed of foam, the board is not completely cured when the board is sent out of the laminator, which results in the inner cracking of the foam.