What are the causes of uneven surface of polyurethane sandwich panel produced by continuous production line?
The upper and lower track plates of the fixed polyurethane plate are not smooth, mainly because of the processing problem, the chain drive polygon effect or the equipment level is not adjusted properly;
Uneven heating of sheet material leads to uneven solidification of Pu material.
The problems in forming of pressing sheet. It may be caused by the bending residual stress of the plate during forming;
