Examples of recycling and processing of the hottes

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Examples of recycling and processing of PET bottles

the pet market is quite large. The carbonated beverage bottles we usually buy can be used in packaging, chemical fiber, knitting and other industries after recycling

pet plastic is widely used in the field of packaging, whether it is packaging film, coiled material, or beer bottle, pet plastic is used. But when these materials are discarded, they face the problem of how to deal with them. Through special alloying process, waste PET can be recycled and made into alloy materials blended with other plastics

at the SPE global plastic environment Annual Conference (GPEC) held in Detroit, alloy materials made of polyethylene and recycled PET were introduced, which attracted attention. At present, three European manufacturers have successfully developed this new alloy material, which is hard, high strength, easy to process and low price

for decades, although there have been reports on such technologies in technical literature, it is only in recent years that such technologies have really been commercialized. At present, erema North America cooperates with three European manufacturers to use the vacurelna continuous curing reactor of erema company to heat and dry pet under vacuum to restore its intrinsic viscosity, and then extrude and granulate with an exhaust twin-screw extruder with a crystallization dryer

application field of PET/PE alloy

Pet/PE alloy has very good properties. Its brittleness is lower than that of pure PET, and it does not need to be dried before processing. In addition, because PET/PE material has high strength, good fluidity and faster cooling speed than HDPE, the molding extrusion time of this material is short and the output is high

spalex S.A., which has been acquired by SP Berner plason SL of Spain, once used 5-layer and 7-layer PE protective film fragments and PE PLC touch screen to control, sample, display and other structures to make T-coil alloy materials in the extruder. They squeezed the mixture into monofilaments to make brush hairs. It is said that the performance of this monofilament is comparable to that of nylon, but the price is much lower than that of nylon at present. Due to the large amount of EVA bonding layer in the coextrusion film fragments, it can be used as the compatibilizer of pet and LDPE

innova packaging system N.V. (i.p.s.) of Belgium first mixed the recycled PET coil with HDPE (75/25) and various additives in an extruder to produce an alloy material, and then molded this alloy material into a gray black transportation tray

the PET/PE alloy molding production line used by i.p.s. company includes ericurema device of ereman, crystallization dryer, extruder and injection molding machine. In this production line, pet flows out of the curing machine at a temperature of 392 ° F, and then enters the extruder at a temperature of 450 ° f (PET processing temperature). At the same time, PE and compatibilizer are added to the extruder, and finally the molten material is sent to the injection machine to form a plastic tray. It is said that the price of this plastic tray is similar to that of products made of wood. The selling price of PET/PE pallets of the company is 6 ~ 8 euros, while the price of wooden pallets is 5 euros

at present, MBM maschinenbau company in Germany is selling this pallet molding production line and exporting it to Japan

three years ago, the British company delleve plastics produced a qualified PET/HDPE Double wall corrugated pipe, which is made of PE No. 3, the necessary check point t/HDPE alloy on the control panel of rubber electronic universal testing machine, and a compatibilizer and impact modifier. PET/HDPE alloy technology enables deleve plastics to make full use of its internal defective recycling materials

it is said that the performance of PET/PE alloy material exceeds the standard requirements of HDPE highway drainage pipe of agremen Hapas Committee in the UK. De we have been a manufacturer for so many years. Lleve plastics claims that the average hardness of 75mm diameter single wall PET/PE pipes is 5.678kn/m2, which is as good as 100mm diameter HDPE pipes. This kind of alloy material has good fluidity, fast cooling speed and easy processing. According to erema, PET/HDPE alloy materials do not need to be dried before molding. The product has good performance, and the processing cycle is only half of that of HDPE

Compatibilization of PET/PE alloy materials

compatibilization is required for the blending of pet and PE materials. Most compatibilizers (some patented) can meet the requirements. EVA is a typical adhesive layer of pet and PE multilayers. At the same time, it can also be used as a compatibilizer of pet and PE alloys. It is cheaper than other compatibilizers, but the amount of EVA is larger, which is 5% - 10% more by weight

erema company found that using vacurema system with vacuum dryer requires less compatibilizer than vacurema system without vacuum dryer, because 5% functional ethylene copolymer can be absorbed in vacuum, which reduces the addition of compatibilizer by 0.3% - 0.6%

Pet/nylon alloy

at the GPEC annual meeting, two companies introduced that PET/PA beer bottle waste can also be recycled through alloy technology. Clariant and johnsor polyker LLC are using a pet chain extender to compatibilize pet and nylon in beer bottles. The trade name of this chain extender is CESA extend. Its effective component is epoxy functional styrene/acrylic copolymer, which was jointly developed by the two companies

clariant initially sold the product to improve the intrinsic viscosity of pet. Later, the company found that CESA extend had compatibilization effect on PET/nylon alloy. It is reported that adding 1% CESA extend chain extender can increase the impact strength by 20% and the tensile strength by 30%, and the melt index by 100. However, when CESA extend is added to 2%, the above properties will not be significantly improved

--- China's plastic industry

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