There are three main processing methods for PET film-film suppliers
There are three main processing methods for PET film: casting method, blow molding method and plane biaxial stretching method. The three methods have their own advantages and disadvantages, and the properties of the films produced are also different. Among them, the flat biaxially oriented polyester film is the most excellent in quality and the most widely used. The raw materials involved in PET synthesis, terephthalic acid, ethylene glycol, and antimony catalysts all have a certain impact on human health. The specific hazards are introduced as follows. 1. Terephthalic acid: It is a white, loose crystalline powder at room temperature, non-toxic and flammable. Irritating to eyes, mucous membranes and upper respiratory tract. 2. Ethylene glycol: It is a low-toxic substance. If you inhale ethylene glycol vapor that has been heated or drink ethylene glycol by mistake, it can cause acute poisoning; if you inhale glycol vapor for a long time, you will be chronically poisoned. The rat LD50 is 5.5~8.54mL/kg, and the human oral LD50 is 80~100g. The concentration of ethylene glycol in the blood reaches 2.4g/L, which can cause acute renal failure. The manifestations of inhalation poisoning are confusion, nystagmus, protein, calcium oxalate crystals and red blood cells in the urine. 3. Antimony catalyst: Antimony catalyst is the most commonly used catalyst in polyester production, mainly including antimony trioxide, antimony acetate, antimony glycol, etc., all of which are white crystalline powders. Antimony acetate and antimony glycol will decompose into acetic acid and antimony oxide fumes when heated. Antimony oxide fumes are highly toxic and can cause gastrointestinal disorders, vomiting, diarrhea, and neurological diseases.