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Stretch film is mainly used to protect products and provide surface protection. The product is lightweight and protects the appearance, achieving the purpose of dust, oil, moisture, water, and theft prevention. Stretch packaging protective film can adjust the tension at the same time to make the product tightly adhere. Soft products, especially in the tobacco and textile industries, have unique packaging effects. Below, stretch film manufacturers tell you the methods to choose high-quality stretch film?

Firstly, observe transparency and measure tensile strength

Firstly, pull the stretch film along the length direction, and then pull it apart horizontally. Stretch films with good stretchability have stronger impact force. The stretching rate of high-quality stretch film can reach 100% -300%. The casting production method has developed from single-layer to two-layer and three-layer, and now the casting method is mainly used to produce LLDPE stretch film. In the early days, LLDPE stretch film was mostly blown film. This is because the production of the casting line has the advantages of uniform thickness and high transparency, which can be applied to the requirements of high magnification pre stretching. Due to the inability of single-layer casting to achieve single-sided adhesion, its application field is limited. Single layer and double-layer casting have less extensive material selection than three-layer casting, and the formula interest is also high, so the three-layer co extrusion structure is still more ideal. High quality stretch film should have high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance.

Secondly, measure the thickness to see if there are any small particles in the film and measure the tensile strength

Crystal dots are a common quality issue in stretch film materials, and it is important to check whether there are particles on the surface of the stretch film. Crystal dots refer to the small pits on the surface of stretch film materials, also known as bright spots. They are mainly common on three-layer stretch film materials, mainly due to the use of silicone synthesis. Silicone has fluidity, and if the surface of the stretch film material is squeezed by some small particles, crystal dots will form. The method to avoid crystal dots is to protect the surface of the stretch film.

Stretch film packaging ensures uniform pressure on packaged items, avoiding uneven damage to the product, which is a traditional packaging method (bundling, packaging, tape packaging, etc. cannot be used). Wrapping stretch film can act and retract, compact, and secure the product as a unit, with small dispersion and no looseness or separation even in unfavorable environments. There are no sharp edges or stickiness to avoid injury.