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Common causes of rupture of stretch wrap film
Source:Mingye Packing Materials Co.,Ltd   Release date:2020-09-10   Hits:76

stretch wrap film is currently the most widely used packaging protection product. It is inevitable that stretch film rupture will occur during the use of stretch wrap film. There are many factors that affect stretch film rupture. During the production of stretch film from casting to winding, Breakage may occur. This situation is more common for stretch films with relatively low thickness.


Common causes of stretch wrap film breakage:


1. In the production process of the stretched film, two times of the printing roller is stuck with ink or the printing roller is not flat, and the stretched film appears uneven after printing on the surprise printing plate.


2. In the process of casting or longitudinal stretching of the film, the production conditions have changed significantly. For example, when the longitudinal thickness of the stretched film changes greatly or the casting has large defects, the casting will be stretched. The local tensile stress exceeds the bearing capacity of the material, which leads to the phenomenon of transverse membrane rupture.


3. The raw materials used to make the stretched film contain impurities with large performance differences, such as low-molecular-weight substances, oil stains, etc., there are obvious horizontal stripes, bubbles on the cast sheet, and various inconspicuous factors for breaking the film before horizontal stretching are further expanded, making Local area strain is too large.


4. The crystallization of the cast piece, the deviation of the orientation condition is too large, the filter is damaged, the impurity content of the cast piece is too high, the material leakage of the machine head, the roller surface is crushed, the use of waste and the unset parameters scratch the stretch film.


5. Extrusion, the temperature of the longitudinallystretch wrap film is not set properly, various volatiles gathered on the top of the oven and the air duct fall on the stretched film. In addition, the damage of the chain clip is also a very important reason.


6. The transverse thickness deviation of the stretched film is too large or longitudinal, the transverse stretch ratio is too large, the edge temperature is too high during the longitudinal stretch, the temperature of the longitudinal stretch is too high, the crystal orientation of the cast sheet is not good, and the chain clip The temperature is too high, there is waste in the horizontal stretching oven to scratch the stretch film.


7. Choose a reasonable material with good deformation and plasticity. The deformation degree is relatively large, and the cylindrical part with a large height can be stretched multiple times, otherwise it will cause wrinkles and cracks due to excessive deformation of the protruding part.

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Sha hu kou district,Changping Town,Dongguan,PRC

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