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　　The high induced brightness of the winding film made by the winding film manufacturer is beneficial to the error classification of dry goods: high longitudinal elongation is beneficial to interference stretching, and the objective is to reduce material color elimination: good puncture part energy and transverse tear strength allow the PU film to encounter sharp corners or edges of goods under high tensile winding film magnification; The high surrender point makes the packaged goods more secure. The film made by tape casting has high brightness, which is not discussed here.

　　With the increase of the number of C atoms of the material comonomer, the branch chain length increases, the crystallinity decreases, and the "winding or kinking" effect of the manufactured copolymer increases. Therefore, the elongation is improved, and the puncture strength and tear strength are also improved. MPE is a high female structured infant compound with very large molecular weight distribution, which can accurately grasp the physical sensing properties of the phase compound, Therefore, there is further progress in performance; In addition, due to the narrow molecular weight distribution and processing limitations of MPE, it is difficult to master the processing conditions. Usually, it is increased by 5% LDPE to reduce the melt viscosity and increase the flatness of the film.

　　The cost of MPE is also high. In order to reduce the old cost, MPE and c4-lldpe are usually used together, but not all c4-lldpe can be matched with it and should be selected. The machine stretch film mostly accepts C6 and C8 materials, which is easy to process and can meet various packaging requirements.

　　Due to the low drawing ratio, manual packaging mostly accepts C4 materials.

　　Article from: winding film manufacturer   http://www.refeel.cn