Market prospect and process technology of PET strappingMarket prospect and process technology of PET strapping
PET packing belt is a narrow belt stretched by unidirectional extrusion. Its forming process is mature, it does not directly contact with food during use, and has high mechanical properties, so it is very suitable for the use of PET recycled from the society produce. The packaging belts produced by Yongchuang are divided into new raw materials and full-waste materials, and the latter has an advantage in price over the former.
Although there are already PE, PP plastic strapping and steel strapping products on the market. But they all have some insurmountable defects. For example: PE, PP packing belts have low tensile breaking load and poor creep resistance; steel packing belts are easy to rust, easy to stab people, and unsafe to use. These have brought many restrictions to their applications. However, the characteristics of PET strapping just make up for these shortcomings, and are widely used in heavy security, high-end strapping materials market, such as steel products, metallurgical products, cotton, chemical fiber, clothing and electrical and electronic products, and aircraft Packing and binding with auto parts, etc.
"Dehumidification and drying" is the key link of PET product molding. 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 PET melt, reduce the intrinsic viscosity, reduce the mechanical properties of the product, and appear silver spots.
In order to ensure the quality of PET plastic products, companies need to invest more money to set strict and efficient dehumidification and drying settings on the production line. Generally speaking, the moisture content of the material can only be controlled below 0.02%~0.03%. It is added to the extruder. For this reason, the energy consumed in the drying process can account for 30% to 40% of the energy consumption of the entire production process of the PET packaging belt. There is an urgent need in the market for a simpler and lower-cost production technology for PET strapping.