PE stretch film in our life, can be said to be indispensable, with its own excellent performance and quality, it is sought after and loved by the majority of users, then with the increasing variety of goods on the market, how to buy high-quality products has become a problem we need to consider .

First, look at the transparency and measure the tensile strength 

First from the PE stretch film length direction along the pull, and then from the direction of the transverse pull, tensile good its impact force is strong. Good quality tensile rate can reach 100%-300%. The casting production method has developed from single layer to two layer and three layer. Now the main production method is the casting production. This is because the casting line production has the advantages of uniform thickness and high transparency, which can be applied to the requirements of high rate predrawing. The application field is limited because single-layer casting can not make single-side sticking. Single and double layer flow in the selection of data is not as wide as the three-layer flow, the formula interest is high, so it is still ideal to three-layer coextrusion structure. High-quality membranes should have high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance. 

Two, measure the thickness, see whether the film has small particles, measure the tension 

Crystal point is a common quality problem of materials, see whether there are particles on the surface of PE stretch film. Crystal point refers to the small pit on the surface of the material, also known as the bright spot, it is mainly in the three layer film material common, the main cause is the use of silica gel synthesis, silica gel has fluidity, if the material surface encountered some small particles extrusion, will form crystal point, avoid crystal point method, is to protect the surface. 

Choose and buy high quality PE stretch film, we need to consider its quality, then quality assurance needs to be based on the quality of production process and material, followed by the precautions in production, whether we have noticed, therefore, when buying, we must ask good businesses, or directly to the relevant professional manufacturers to buy, more secure.