The recycling of waste PET polyester bottle

Polyester ( PET) Bottle of high transparency, good intensity, light quality, cut off performance, thus is widely used in packaging carbonated drinks, mineral water, spices, cosmetics, medicine and pesticide, etc. , and its application field is expanded, its waste product recycling problem also becomes increasingly serious. 1998 U. S. sales of PET bottles of 34. 30000 t, recycling 10. 20000 t, the recovery was 29. 7%; Sales to 36 in 1999. 10000 t, recovery of 12. 90000 t, the recovery rate of 30. 7%. But in our country need to PET bottle about 200 million only, recycling utilization rate is almost zero. This not only waste of raw materials, also have a negative effect on the environment. Therefore, recycling of waste PET bottle, is beneficial to protect the environment, can also save raw materials, to ease tensions in PET chip market. 1 waste PET bottle recycling. 1 principle of waste PET bottles generally includes PET bottles, HDPE tap, aluminum cover, also with EVA lining, paper and glue, etc. Described in this article PET recovery technology is based on the above all sorts of material physical properties caused by the different separation and purification method. First washed by blast air separation and water EVA, paper, glue is cleared, then according to the PET, HDPE and aluminum density difference and to separate them. Suspended by water to remove HDPE, again through the density is about 1400 kg/m3 salt solution of suspension, make the PET and aluminum separation, thus achieve the goal of recycled PET. 1. 2 mill equipment, air separator, flotation machine, oven. 1. 3 process route process route is shown in figure 1. Will be crushed into PET bottle with two pieces 6 ~ 8 purpose, through the air separator to remove the paper scraps, EVA and powder. And then washed under 85 ℃ ( Mix 8 min) To remove gum and other impurities. After washing, PET, HDPE, and left a mixture of aluminum material, enter the water flotation cell, remove float on top of HDPE, halide solution into the flotation tank remove floating in the upper of PET, cleaning, drying can be further PET virgin material. The use of recycled PET 2. 1 PET recovery quality analysis to quality analysis, recycled PET and high strength PET slice quality indicators compared with our factory, the result see table. By the chart shows, recycled PET characteristic viscosity, end carboxyl content and diethylene glycol content increased, and the original and amorphous into amorphous. Due to changes in the quality index, the application of recycled PET and PET the application of new material is different. 2. 2 the use of recycled PET (1) directly using recycled PET. Be used for recycled PET material by the melt spinning fiber filling material, carpet lining, cotton wool and bundling rope, etc. (2) recycling PET blended with new PET. Will be recycled PET material according to the proportion of 20% ~ 25% mixed with new material, PET directly making PET molding except food packaging products. (3) before using recycled PET by solid phase polycondensation. Recycled PET materials by solid phase polycondensation, can improve the molecular weight, and other quality indicators also have different degrees of improvement, to meet molding conditions again, but to broaden the scope of the use of recycled PET, can be used for making zipper, container, For packaging pesticides, chemicals, etc. ) , the tub and decorative plate. 3 discuss (1) the depolymerization of recycling methods and recycling method, blending recycling method and electrostatic recycling method, simple technology, less equipment investment. (2) in recycled PET at the same time also can recycle a certain amount of aluminum material. (3) in the process of recycling, no flammable solvents, safety; Cleaning solvent can be recycled; No harmful gas and sewage discharge, will not pollute the environment. If you want to customize the cosmetics manufacturer PET plastic bottles, please contact the cosmetic packaging bottle manufacturers.
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