First, the advantages and disadvantages of shrink film shrink film is a common plastic products, it is by rolling, extrusion, blow molding, etc. This process is made of several blown film is a plastic material through an extruder to feed melt extruded thin tube, followed by hot blow it with compressed air, after cooling and shaping get shrink film products. A process for producing a film with a blow advantages: (1) simple equipment, less investment and quick returns; compact (2) device structure, small footprint, low cost plant; (3) the film stretched, inflation, mechanical strength high; (4) Product boundless material, less waste, lower costs; (5) a wide degree of convergence, less weld, easy bag; and other molding process than disadvantages: (1) the uniformity of the film thickness difference; (2) production line speed is low, a lower yield (in terms of rolling); (3) thickness in 0.01∽0.25mm, folded diameter 100-5000mm; blown film of its main raw materials: LDPE, HDPE, LLDPE, EVA, PVC, PP , PS, PA and so on. Second, polyethylene blown film molding blown film process technology, materials, plastics extrusion, blow molding forming tube bad; cooling, pulling, winding. In blown film forming process, depending on the direction of extrusion and traction can be divided into flat blow, blowing, blowing down three, which is the main molding process also has a special blow molding, blow squeeze above method. (1) of the Act blow squeezed flat using a crosshead, namely the head of the extruder feed direction perpendicular to the extrusion tube broken up, pulling to a certain distance, by the word plate holder rope, the squeeze tube the introduction of compressed air from the bottom of it blown into a bubble tube, and compressed air to control the number of its transverse dimension to pull the speed control the vertical size, shape Bulb cooled blown film can be obtained. As shown in FIG. Applicable to the blowing of the main varieties of plastic PVC, PE, PS, HDPE. (2) flat extrusion blow under the Act to use the crosshead, bubble tube leads from the bottom of the nose level process called extrusion blow under law, which is particularly suitable for small viscosity materials and high transparency requirements of plastic film. Such as PP, PA, PVDC (vinylidene chloride). As shown below. (3) The cast straight flat nose blowing method using the extruder screw concentric bubble tube with the centerline of the nose in the process the same horizontal plane, said flat flat extrusion blow Act, which applies only to blow small-caliber film products, such as LDPE, PVC, PS film, flat blow law also applies to the production of heat-shrinkable blown film. These three processes have advantages and disadvantages, are the advantages and disadvantages compared to the process level table squeezed blowing tube hanging on the cooling tube, traction and stable small footprint, easy to manufacture and easy to operate off large diameter, thicker films Requirements plant high, high cost not suitable for machining large plastic flow is not conducive to film cooling, productivity flat edged blow in favor of film cooling, higher productivity and greater mobility can be processed plastic extruder high above the ground, inconvenient to operate should not produce a thin film flat head extrusion blow-centered style flat, simple structure, more uniform film thickness easy operation, the lead film is likely to blow up ratio can be larger relative density is not suitable machining, folding the film accounted for a large diameter an area of ??large bubble pipe cooling slowly, unfit greater mobility plastics processing. Pro who can be our Alibaba shop: 000 large plastic (Shenzhen) Co., Ltd. inquiry, our shop has been open for eight years. Of course, our factory have more experience, because our factory was started in 1994 to do now, more than 20 years of experience in the production. We look forward to establishing long-term partnership with you!