What are the recycling of recycled PET flakes

Time:2018-08-31

PET, scientific name: polyethylene terephthalate, Chinese called polyester, commonly known as polyester resin, polyester chips, it is a linear thermoplastic. PET is widely used in water and beverage packaging because of its lightweight, barrier preservation, weathering resistance, aging and ease of use.

PET plastic bottles recycling can not only solve environmental problems but also realize resource recycling and alleviate the contradiction of insufficient PET raw materials in China. At present, the recycling rate of PET plastic bottles in China is almost 100%. The development of recycling technology is also very rapid.

What are the recycling of recycled PET flakes

The recycling of PET bottles is divided into physical recycling and chemical recycling. Among them, physical recovery accounts for the main part, PET bottle production is large, and bottle-grade PET has high viscosity, which is easy to use for degradation. These laid the foundation for the recycling of PET bottles.

The physical recovery process of PET bottles: firstly separate the PET bottle body from the cover, label, etc., then pulverize the PET bottle body, clean and decontaminate, and finally dry, the dried clean film can be processed according to the application or After modification, it is processed into various products. WANROOETECH Machinery Research Institute specializes in the development and production of PET bottle chip cleaning equipment and PET bottle chip recycling granulation equipment.

Generally used in plastic packaging, fiber, glass fiber reinforced, plastic modified, woven products. In this way, the secondary utilization of the PET bottle is achieved.

Bottle to bottle recycling

After the PET bottle is used, its material properties are kept good. When the impurities and water are qualified, the PET bottle can be directly used for manufacturing and packaging plastic bottles such as liquid pesticides, engine oils and chemical reagents.

After the PET bottle has undergone physical changes, its hygiene will change. In China, it is generally not used directly in food packaging materials. In the United States and Europe, high-quality PET tablets can be directly reused in food packagings such as water and beverages.

In the recycling process, the PET material will be degraded by heating, and its viscosity will be lost. If the chain extension or bulk viscosity-increasing technology is introduced during the processing, bottle-to-bottle technology is more advantageous.

Spinning fiber

At present, the main purpose of cleaning and drying PET bottle tablets is to produce polyester staple fiber. The main reason is that the PET resin used as fiber has low intrinsic viscosity, and even if a small amount of molecules are hydrolyzed during processing. Or degradation does not affect the spinning process to get the desired product.

Polyester staple fiber can be used to produce hollow materials such as garments, mattresses and plush toys, geotextiles, felt fabrics, carpets and other materials and products.

Re-growth silk is the smallest category of regenerated chemical fiber. It can produce velvet fabrics with low quality requirements or make filaments in the field of circular machines. Production of elastic bands, curtains, sofa fabrics, as well as blankets, carpets and other products.

Polyester masterbatch: Polyester staple fiber products are mostly white, but they are often dyed when making garments. The use of PET flakes as color masterbatch is better than the new fiber grade PET resin slicing, because its intrinsic viscosity is slightly reduced during processing, which does not affect the dispersibility and additive effect of the color masterbatch, and utilizes the spinning process. The requirements are more obvious in terms of production costs.

Modified plastic

Recycled PET can be blended with other polymers to produce various modified materials.

PET/PE alloy: It has many advantages such as hardness, high strength, easy processing and low cost. Its brittleness is lower than that of pure PET, and it does not need to be dried before processing. The alloy has good fluidity and a faster cooling rate than HDPE, which is beneficial to shorten the cycle of molded articles. The key to the production of PET/PE alloys is the choice of compatibilizers. At present, three companies in Europe have successfully developed and put them on the market.

Nano-layered silicate modified high barrier PE: can greatly improve the barrier properties of PET, reduce oxygen permeability, and also significantly improve PET strength and heat resistance. It can be used to enhance and enhance the processing of engineering plastics such as flame retardant, toughening and low warpage. It can also be used for the processing of PET packaging bottles and films with high barrier requirements.

PET is generally not directly injection molded, but it can be injection molded after being made into composite materials such as glass fiber reinforced and wood plastic. Used to make a variety of household appliances, automobiles, computers and other components, its performance is good

Glass fiber reinforced material

PET is generally not directly injection molded, but it can be injection molded after being made into composite materials such as glass fiber reinforced, wood plastic, etc., and used to make various household appliances, automobiles, computers and other components.

The glass-reinforced reinforced PET has good heat resistance and mechanical strength. For example, the heat-resistant automobile wheel cover has a thermal distortion temperature of 240 degrees, a flexural modulus of 9500 MPa, bending strength of 214 MPa, and an impact strength of 15 kf/ M2.

Plastic woven bag, cloth


Recently, research and development work on processing plastic woven bags, straps and fabrics from PET flakes has been active, and processing technology and equipment have gradually matured. Entrepreneurs and experts who pay attention to this project in the industry have placed heavy burdens on this application. I hope that the application of PET bottle tablets in this field will promote the upgrading of woven products and open up a new era of woven products.