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The knowledge about Stretch Flim

The knowledge about Stretch Flim

2020-07-03


The application of stretch film is more extensive, and as it expands, the application of stretch film is also more common. It is commonly used in packaging, which has good tensile properties, tear resistance, strong penetration resistance, high transparency, good self-adhesiveness and a high shrinkage rate, and is widely used. With the increase in the number of comonomer C atoms in the stretch film material of the stretch film, the branch chain grows and the crystallinity decreases, the "coiling or kinking" effect of the resulting copolymer increases, its elongation increases, and the puncture strength and tear strength All improve.


One of the formulations of the stretch film is to add PIB or its masterbatch to the polymer, and the other is to blend VLDPE. PIB is a semi-transparent viscous liquid. Direct addition requires special equipment or transformation of equipment. Generally, PIB masterbatch is used. There is a process for the removal of PIB, which usually takes three days. In addition, it is also affected by temperature. When the temperature is high, the viscosity of the stretched film is strong; when the temperature is low, the stretched film is not very sticky, and the viscosity of the stretched film is greatly reduced after stretching.


With the increase of the number of C atoms of the comonomer of the material of the wrapping film, the length of the branch chain increases, the crystallinity decreases, and the "winding or kinking" effect of the resulting copolymer increases, so the elongation of the wrapping film increases and the puncture of the wrapping film Strength and tear strength are also improved. MPE is a highly stereoregular polymer with a narrow molecular weight distribution, which can accurately control the physical properties of the polymer, so the performance of the wound film has been further improved; and because of the narrow molecular weight distribution of MPE, the processing range is also narrow, and the processing conditions are difficult to control , Usually add 5% LDPE to reduce the melt viscosity and increase the flatness of the wound film. Material density also affects the performance of the stretch film.


With the development of the packaging industry, the stretch film occupies the most advantageous position in the packaging industry. The stretch film can tightly wrap the goods as a whole, reducing the damage, collapse and loose packing of the goods during storage and transportation. The goods are waterproof and dustproof by stretch film packaging. It has high transparency. It can easily distinguish the types of the goods being packaged. It is often used in the logistics industry. It is mainly environmentally friendly, easy to use, and not easy to fall off. So what are the benefits of  stretch film as a packaging material?


1. Stretch film is developed from single layer to two-layer and three-layer. Now it is mainly produced by casting method. Stretch film is a material with good toughness, and it is not easy to crush with ordinary plastic crusher. Because the stretch film is soft and tough, it is not easy to shred, not to mention the high temperature of the tool at high speed, which will cause the LDPE to melt and adhere to the blade. PE granulation can be directly put into the feeding port of the extruder, and the PE film is dragged into the barrel by the shearing force of the screw to be heated and melted and extruded to granulate.


2. The stretch film method is selected according to the characteristics and application scope of different types of stretch film. The stretch film is stretched according to the preset stretch ratio and wrapped around the pallet goods. The advantage is that the stretch film Uniform, beautiful packaging, strong adaptability (ultra-light, super-high cargo can be used), and under the same conditions, save 3050% of consumables than the stretch-resistance type, so that the speed when the stretch film is actively pulled out is slower than that of the tray speed.


3. In the production and sales of PE stretch films, regardless of product quality, performance, service life, etc., and desperate to make a fuss about the price, there has been serious vicious competition, which has greatly hindered high performance, high-level stretch films The development of technology has an adverse effect on the development of the stretched film market.


A stretch film is very common in our daily life. Stretch film can be seen in the transportation of products in all walks of life. It has a good protection effect on the product during transportation and can avoid product transportation. Hazards such as collision extrusion. In the stretched film industry, pe stretched film is the stretched film with the highest transportation usage of major products.


Kint Yongji carries out strict quality monitoring and cost control on each production link of Pipe Wrapping Tapes, Bopp Packing Tapes, Masking Tapes, PVC Electrical Tapes and so on. From raw material purchase, production and processing, and finished product delivery to packaging and transportation. 

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