Pu resin foam material has white lines.

Insufficient clamping force. Polyurethane resin is a kind of polymer with repeated structural units of carbamate segments, which is prepared by the reaction of isocyanate and polyol. When the locking force of resin is insufficient, white lines will appear in the production of foamed materials, which need to be repaired and locked. Pu resin refers to polyurethane, which is a kind of polymer compound.