How is PVC edge strip produced?
The base material of PVC sealing strip is composed of PVC resin, calcium carbonate powder and various auxiliary materials (stabilizer, DOP oil, ACR, stearic acid, toner, anti-aging agent, etc.), and the sealing edge effect is related to the proportion of the base material raw materials.
Pure polyvinyl chloride (PVC) resin belongs to a class of strong polar polymer, its intermolecular force is larger, resulting in PVC softening temperature and melting temperature is higher, generally need 160~210℃ to process. In addition, some substituted chlorine groups contained in PVC molecules are easy to lead to the dehydrochlorination reaction of PVC resin, resulting in the degradation of PVC, so PVC is extremely unstable to heat, and the temperature rise will greatly promote the HCL removal reaction of PVC, and pure PVC begins to remove HCL reaction at 120℃, resulting in the degradation of PVC. In view of the above two aspects of the defects, PVC needs to add additives in processing, in order to be able to produce a variety of soft, hard, transparent, good electrical insulation, foaming and other products to meet people's needs. When selecting the variety and dosage of additives, it is necessary to comprehensively consider all aspects of factors, such as physical-chemical properties, flow properties, molding properties, and finally establish the ideal formula. In addition, according to different uses and processing routes, we also need to choose the type of resin. The combination of different types of PVC resins and various additives is what we often say about PVC formula design. The formula of PVC edge sealing strip is mainly divided into basic resin, plasticizer system, stabilizer system, lubricant system, filler system, colorant system and so on.
The production process of PVC edge sealing strip is mainly divided into three parts; 1, the use of open mill to mix the material evenly, processing into sheets, and then extrusion sealing strip. This kind of production process has many processes, slow production speed and low efficiency. 2, the mixed material is first granulated by a single screw extruder, the pellet is plasticized by the extruder, the mold is formed into a strip continuous product with a special cross-section, and the product is crimped after cooling. 3, the mixed powder is plasticized directly through the extruder, and the mold is formed to obtain the sealed product.
Therefore, a good edge products, need to start from the most basic selection of materials to strictly check, MAO bamboo edge in the selection of materials, production process control has strict requirements, so it has also obtained the international general certificate ISO9001 and SGS recognition.
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