What kind of process is used to refine High Quality PE Stretch Film?

High Quality PE Stretch Film, as an important material in the modern packaging industry, the main raw material of High Quality PE Stretch Film is high-density polyethylene (PE) plastic particles. These particles have excellent physical and chemical properties and are ideal for making stretch films. Before formal production, the raw material particles will undergo a series of pretreatment steps. This includes drying to remove moisture from the particles to prevent bubbles from being generated during the production process or affecting the transparency of the film. At the same time, as needed, an appropriate amount of functional additives such as release agents and antistatic agents will be added to improve the practicality and processing performance of the film.
The pretreated raw material particles are fed into a screw extruder for plasticization. Under the high temperature and high pressure of the extruder, the particles gradually soften and melt to form a continuous molten polymer. During the plasticization process, the molten polymer passes through one or more mixing zones to ensure that various additives and masterbatches are evenly distributed in the polymer. This helps to improve the uniformity and performance stability of the film.
The molten polymer is fed into a biaxial stretching device, which is usually composed of a set of transverse and longitudinal stretching mechanisms. During the stretching process, the molten polymer is stretched in both the transverse and longitudinal directions. This stretching process not only makes the thickness of the film more uniform, but also rearranges and orients the molecular chains, giving the film high strength, high transparency and good self-adhesion. The stretch ratio is one of the key factors affecting the performance of the film. By adjusting the stretch ratio, stretch films with different strengths and elongations can be produced to meet the needs of different customers.
The stretched film is quickly cooled and solidified by an air cooling system or a water cooling system. The air cooling system usually uses fans and air flow to reduce the temperature of the film, while the water cooling system uses water spray or water bath to achieve cooling. The film after cooling and shaping has a stable shape and size, uniform thickness, and high utilization rate of scraps. At the same time, the cooling process also helps to improve the rigidity and tear resistance of the film.
The PE stretch film after cooling and shaping is cut by a slitting machine to meet the width and length requirements of different customers. The slitting machine usually uses precision knives and control systems to ensure cutting accuracy and the integrity of the film material. After strict inspection, the finished film will be packaged and trimmed. Packaging is usually packaged in plastic film or cartons to prevent the film material from being contaminated or damaged during transportation and storage. The purpose of trimming is to remove burrs and irregularities on the edge of the film material to improve the aesthetics and practicality of the product.