If the PE protective film presents crystal points, the detailed reasons are:

Reason 1: The material used for the protective film is not up to the standard in cleanliness, perhaps due to dust pollution.

Reason 2: In the selection of raw materials, no suitable ones were selected. Perhaps the compatibility between several raw materials was not good, and then crystal points occurred.

Reason 3: In the processing of protective film, the processing temperature was not well controlled, which led to poor plasticization of the material, perhaps excessive plasticization, and then crystal point.

Reason 4: There are problems with the processing equipment. There are quality problems with the equipment itself. Perhaps the processing capacity of the equipment is poor.