What is the method to identify the quality of PE stretch fil
PE stretch film is a new generation of environmentally friendly packaging materials used in the market. It has been widely used in bulk goods, palletized packaging, electronic product boxes, aluminum, doors and windows, and other industries. However, with the increasing number of pe stretch film manufacturers, the pe stretch film materials used by enterprises are not the same, and it is inevitable that they will encounter some quality problems. We can identify the quality of PE stretch film by the following aspects.
A. see transparency, measure tensile strength:
First, it is pulled away from the longitudinal direction of the pe stretched film, and then pulled away from the transverse direction, and the stretched film having good stretchability has a strong impact force. Good quality pe
The stretched film stretch ratio can reach 100% to 300%. The casting production method has been developed from a single layer to two layers and three layers. Currently, the LLDPE stretch film is mainly produced by a casting method, and the early LLDPE stretch film is mainly blown film. This is because the production of the casting line has the advantages of uniform thickness and high transparency, and can be applied to the requirement of high-rate pre-stretching. Since single-layer casting does not achieve single-sided adhesion, the application field is limited. Single and double-layer casting has no three-layer casting in the data selection, and the formula interest is also high, so it is better to have a three-layer co-extruded structure. The high-quality pe stretch film should have high transparency, high longitudinal elongation, high yield point, high transverse tear strength and good puncture performance.
B. Measure the thickness and see if the film has small particles:
The crystal point is a common quality problem of the pe stretch film material, and it is seen whether the surface of the pe stretch film has particles. The crystal point refers to the small pits on the surface of the pe stretch film material, and some people call it the bright spot. It is mainly used in the three-layer pe stretch film material. The main cause is that the silica gel is synthesized, and the silica gel has fluidity. When the surface of the stretched film material encounters some small particles, it will form a crystal point. The best way to avoid the crystal point is to protect the surface of the stretched film.
Therefore, due to the low threshold of the pe stretch film industry, there are also many, and there are more and more stretch film manufacturers on the market. But pe stretch film material is not the same, please consumers to polish their eyes and blindly buy only blindly.
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