PET plastic bottles, beverage packaging, not only widely used in the packaging of carbonated drinks, drinking water, fruit juice, enzymes and tea drinks, is the most used beverage packaging today, but also widely used in food, chemical, pharmaceutical packaging and many other fields. PET plastic has a wide range of applications in the field of packaging, whether it is packaging film, roll are used PET plastic. But when these materials are discarded, they face the problem of what to do with them. Tens of billions of PET plastic bottles are produced in China every year. It is estimated that by 2005, more than 500,000 tons of PET will be used in the manufacture of PET plastic bottles every year.
The physical recycling and treatment method of PET plastic bottles is relatively simple, mainly drying and granulation the cleaned PET plastic bottle waste. The physical treatment of PET plastic bottles is closely related to the sorting process. There are two main physical recycling methods: one is to cut waste PET plastic bottles into pieces, separate HDPE, aluminum, paper and adhesive from PET, PET fragments and then washed, dried, granulation; Second, the non-PET bottle cap, bottom, label and other impurities on the waste PET plastic bottle are separated by mechanical method, and then washed, broken, granulation. Recycled PET should not contain PVC impurities, otherwise it will affect the color of PET. When the amount of PVC mixed in is small, it can be separated by manual method on the conveyor belt, that is, PVC and PET plastic bottles have different melting points in the stress part when subjected to torque. The broken PET and PVC fragments are passed through the conveyor belt equipped with heaters and temperature control. PVC is melted and adhered to the conveyor belt, which can be separated from PET. The label on the beverage bottle can be removed by a combined separation device of blower and cyclone separator after the bottle is broken. The broken PET fragments can also be added vertically from the top of the separation tower, and the fragments and the updraft form a countercurrent. The label is removed by using the difference between the proportion of PET and label fragments, and the PET comes out from the bottom of the separator. In order to ensure the efficiency of label separation, more than two sets of separation devices can be used in production. The washing of PET debris is very important. In washing, 80-100℃ hot water is often used to soften or dissolve EVA adhesive or other types of adhesive affixed to the label and base. In order to prevent the exfoliated adhesive from adhering to PET fragments, additives such as alkali, emulsifier or other special chemical agents need to be added to the water. Generally, the formula composition and content of the cleaning liquid are determined by the factory according to the source and bonding characteristics of the waste bottle. The cleaning liquid can be filtered out of impurities and reheated for recycling. The washing can be carried out in a special cleaning tank equipped with a stirrer. PET fragments are usually reduced to 2% water content by centrifugal dewatering machine, and then dried by belt or tube dryer to reduce the water content to 0.5%. The high quality PET plastic bottle recycling system successfully developed by German Krones has an annual processing capacity of 15,000 tons of PET beverage bottles. The processed PET raw materials can be directly made into other PET containers, and the production cost is greatly reduced. PET plastic bottle recycling system uses chemical coating elimination technology, with caustic soda as chemical coating eliminator, to remove the pollutants adhering to the surface of PET plastic bottle, can realize the recycling of any kind of PET plastic bottle. The recycled products treated by this technology can not only be directly mixed to make preforms, but also meet the requirements of purity and quality due to the low content of acetaldehyde and yellow pigment. It is especially suitable for the packaging of products in the food and beverage industry, and the cost is 20%-30% lower than that of general new materials.
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