First, the latitude line is specially caused to shrink quickly after the mold is released.
Second, the width of the self-contained canvas is inconsistent, and it is difficult to grasp during the molding process, resulting in narrow transmission bandwidth.
Third, the baffle is not standardized, resulting in the width of the conveyor belt does not meet the requirements.
Fourth, the use of special iron is wrong!
Fifth, the heat shrinkage of rubber itself.