Packing steel belt manufacturers: the importance of drying PET packing belts

Packing straps are commonly used packaging materials for our daily packing items. Among the straps, PET straps and galvanized steel straps are mostly used. In order to ensure the tensile performance and flexibility of the straps, the drying and drying processes of the straps must be done. Well, this will directly affect the quality of PET strapping. Because the strap is a wet polymer, it will quickly absorb the moisture in the air after encountering the air, which will increase the moisture of the material and affect the performance. Therefore, be careful not to let it absorb water and deteriorate. For example, if the completely dried PET resin is in contact with air with a relative humidity of %～% for a long time, its humidity will reach .%. The trace moisture remaining in the material will cause water degradation of the resin during the heating and molding process of PET, and decrease the intrinsic viscosity, which leads to the decrease of its mechanical properties. Therefore, whether it is new PET materials or waste plastics, strict and effective drying and dehumidification must be carried out before molding. The temperature of the completely dried packing belt should be controlled, generally the temperature is controlled at -°C. Packaging steel belts are easy to rust, stab people, and are unsafe to use. The emergence of PET packaging belts has just made up for the defects of steel belts, and has been widely used in the middle and high-end strapping material market. Used for packing and bundling of steel products, metallurgical products, cotton, chemical fibers, clothing, electrical and electronic products, etc. The main production material of PET strapping is PET resin, which is a high-performance engineering plastic with good weather resistance, dimensional stability, abrasion resistance, extremely high mechanical properties and extremely low creep. The unidirectional stretching process is used to manufacture PET straps. However, the packaging steel belt manufacturers believe that the PET packaging belt has an additional step in the production and processing process than the usual packaging belt, which is the drying and dehumidification step. PET is a hygroscopic polymer, it will quickly absorb moisture in the air, and the trace moisture remaining in the material will cause water degradation of the resin during the heating and molding process of PET, and decrease the intrinsic viscosity, which will cause the mechanical properties of the product to decrease, and the appearance Shows silver spots. Therefore, whether it is new PET material or waste plastic, it must be effectively dried and dehumidified before molding. The above is the importance of the drying process of PET strapping, which is introduced to you by the editor of the strapping steel belt manufacturer. I hope that the little knowledge brought to you today can be helpful to you.