Working Principle of Film Blowing Machine
2023-03-31
Film blowing machine is a common film making equipment, which is widely used in plastic packaging industry, manufacturing agricultural film, industrial film, composite film and other industries. Its working principle is to extrude molten plastic granules into molten film by high temperature and pressure, then after traction using wind to guide the film to blow and expand to make it more uniform and thick, and finally cut and set the length by cooling and coiling. The following is a detailed introduction to the working principle of film blowing machine.Cutting Bag Machine I. Feeding and Melting There are two main ways to add material to a blown film machine: molecular fusion and hybrid feeding.Bag Making Machine The molecular fusion technology is to catalyze the molecularization of plastic raw material triple-labeled particles in high-intensity friction and friction to make them melt-liquid material. Then the resulting molecularized particles are pushed into the heating film of the fusion section and heated and melted under high temperature and pressure.Bubble Bag Machine Mixing and charging technology is to mix the granular raw material and the molten raw material together, relying on the heating plate to heat and melt under high temperature and pressure to form a homogeneous melt. II. Extrusion Under the action of extrusion head and screw of film blowing machine extruder, the melted plastic raw materials are extruded through the following flow channel into the blowing and expanding section. And through the role of auxiliary institutions such as pressurizers and sub-mechanics, the melt excludes the air and maintains a certain tension. Third, blowing expansion The blowing process is to extend one of the extruded sections into a circular blown film, which is thinner, into which air is injected before extrusion. Due to the action of air, the blown film will be laterally expanded and elevated so that the film will be more uniformly thick and have some traction. In order to achieve better results, the blowing rate and the blowing multiple of the film are usually adjusted by controlling the blowing pressure. In the process of film blowing, some auxiliary agents such as antistatic agent, pigment, UV protection, etc. need to be added in order to improve its impact, scratch and heat resistance. IV. Cutting After the blown film is shaped and formed, it needs to be cut, which is usually done in the following two ways: ① Thermal cutting Thermal cutting is a kind of "burning" forming method, using high temperature heating to break the blown film tube. ② Cold cutting Cold cutting is a low-temperature forming method in which the blown membrane is cut off by a wheel knife. Finally, after the membrane cutting, the membrane rolls need to be wound and fixed in length, and the specific operation techniques need to be adjusted according to different equipment. V. Maintenance The blown film machine requires regular maintenance to ensure its normal performance. Common maintenance steps are as follows: ① Daily cleaning of the machine and various parts of the blown film machine, timely replacement of damaged parts, and addition of lubricants; ② The extruder and the blowing and expanding stage should be cleaned with cooling water every week; ③ During the production process, the normal working condition of each part should be checked and adjusted at any time, and reasonable adjustment should be made according to the product quality. Translated with www.DeepL.com/Translator (free version)
