Precautions for stretching film.The winding film is generally used for the packaging of goods, and the common winding film color is mostly transparent. In fact, due to actual needs, many customers will go to the manufacturer to make winding films of various colors.
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Precautions for stretching film.Due to the high viscosity of the tackifying master batch, the adhesion between the suction pipe and the base metal is simple, resulting in the blockage of the weighing equipment and the conveying pipeline, which seriously affects the accurate measurement and feeding of the base metal, resulting in the unstable function of the product. In order to solve this problem, in many experiments of the Plastics Research Institute, polyethylene and tackifying master batch are mixed in proportion to obtain master batch, and then the viscosity of the surface particles is reduced to make the materials mixed uniformly in proportion.
Precautions for stretching film.the materials are transported through the vacuum straw, the material supply is stable and accurate, and the proportion of tackifying master batch can be adjusted. In the production process of winding film, the proportion of tackifying masterbatch is adjusted with the change of seasons, which is about 1% higher than that in summer and winter. Two layers of tackifying masterbatch can be added to obtain double-sided adhesive packaging film.
Precautions for stretching film.he movement of the melt from the die lip to the back of the movable roll is very large: the full width of the die lip of this production line is 2700 mm. However, the melt movement width from die lip extrusion to roll casting is only 2500 mm. This makes it difficult to control the thickness of the edge of the winding film and affects the thickness curve of the entire width of the winding film.