Glass Manufacturers

Glass Manufacturers Pet Bottle Manufacturers, Custom Pet Bottles, Pet Bottles suppliers.
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Polyester (PET) bottles blow for raw materials for the saturated linear thermoplastic polyester, mainly used performance indicators are: the intrinsic viscosity (IV) should be controlled at 70 ~ 85ml / g, making blow molded bottles with high mechanical strength and transparency; for large volume (greater than 2 liters) of the bottle, the selection of an intrinsic viscosity of polyester raw materials 70 ~ 75ml / g. Injection blow molding bottle Preferred pharmaceutically acceptable small volume higher intrinsic viscosity index is preferably a material production. Since the variety of raw materials selection is correct or not, related to the merits of the selection and quality of bottle production process molding process parameters. Thus, in the production of medicinal PET bottles, intrinsic viscosity of the raw materials, the crystallization temperature, cooling rate, and other process data alignment effect is particularly important. This is because the polyester material is a crystallizable polymer, the crystallization rate is small, only 6μm / min (max). Through process control crystallization conditions such as temperature and cooling rate, the polyester bottle into a non-crystalline or crystalline, and can change the crystal type and quantity. Crystallinity of the polyester requirements generally about 30%. At or slightly above the glass transition temperature slightly below the melting point, the crystallization rate of the polyester is small, crystallization takes a long time, at a temperature of about 175 ℃, the crystallization time is much shorter. In short, only by heating a crystalline polyester, the crystallization process is slow, it is possible to form a larger spherulite crystal, which refracts the light, so that white goods, and brittleness. Furthermore, with increasing the crystallization rate of the polyester decreases their Ⅳ. Ordered molecular orientation of the polyester can promote crystallization, the formed crystals called strain-induced crystalline, the grain is small, the light is not refracted, so oriented polyester article is transparent.