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How to identify high-quality PET plastic raw materials-film suppliers

by:POLYVA     2021-10-30
How to identify high-quality PET plastic raw materials? As plastic raw materials, PET mainly includes polyethylene terephthalate PET and polybutylene terephthalate PBT. Polyethylene terephthalate is also commonly known as polyester resin. It is a polycondensate of terephthalic acid and ethylene glycol. Together with PBT, it is collectively referred to as thermoplastic polyester, or saturated polyester. PET is heard a lot in daily life, but not many people know how to identify high-quality PET plastic raw materials. PET is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. Creep resistance, fatigue resistance, good friction resistance, low abrasion and high hardness, with the largest toughness among thermoplastics; good electrical insulation performance, less affected by temperature, but poor corona resistance. It is non-toxic, weather-resistant, chemical-resistant, and has high hygroscopicity. Drying before molding is necessary. Resistant to weak acids and organic solvents, but not immersed in heat-resistant water, and not resistant to alkalis. PET resin has a high glass transition temperature, slow crystallization speed, long molding cycle, long molding cycle, large molding shrinkage, poor dimensional stability, crystallization molding is brittle, and low heat resistance. Through the improvement of nucleating agent, crystallization agent and glass fiber reinforcement, PET has the properties of PBT and the following PET plastic identification methods: 1. Smell the taste first, the taste of PET is different from ordinary plastics, burn it with a lighter, and then It will smell very aromatic and comfortable (just burn a bottle to smell it). If the PET contains other ingredients, the smell will be very pungent. Some bottles contain SEBS ingredients that cannot be used. 2. Wire drawing. When it is burning, draw the wire on the lighter to see if the wire is long. Then break the drawn wire to see the break point in the middle. Is the wire rolled into a small circle? It often means that the melting point is high. 3. Look at the burned part, if the black is distributed or the oil drops quickly, most of the melting points are abnormal, which is often found in PET film. But generally if it is a bottle tablet, there shouldn't be any major problems. The most critical point is to distinguish whether it contains PVC, which is a fatal injury to PET. First take more samples, and then spread it out in a sunny place. The PVC will be light blue in the sun. If there is a white crease in the middle of the fold. The above is the naked eye identification, the accuracy is limited, mainly depends on experience. There is also a more practical and better way. Buy an oven and adjust the temperature to 250 degrees and bake there for half an hour. If the goods contain PVC, there will be a lot of yellow spots on the surface; if the melting point is not enough, it will be very fast. melt. In fact, there are many varieties of PET to be made, such as crushed PET film from foreign factories, pulp block material, and roll film less than 30 cm in length. These have different customer groups. The identification of these goods strongly requires the oven to be used for inspection. In particular, PET rolls are very scarce in the entire market. Generally, the length is 80 to 120 cm or more. The price of high-quality PET plastic film with a thickness of 3-5 filaments is also very high (white and transparent). It is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service. Interested parties welcome to inquire! Contact: Wen Feng 13728425799
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