Medical barrier PET bottle processing and forming technologies – PET bottles, pr
Is currently one of the main containers, mainly for Drugs Carbonate Beverages Packaging, can also be used for wine, tea, Juice , Mineral water, edible oil, spices, Cosmetic , Pesticide And detergents and other liquid packaging. As Pharmaceutical Packaging Containers, PET bottles with many benefits. First of all, lightweight PET bottle, bottle molding easily and securely. Strength and flexibility than the other plastic materials, can withstand considerable impact without damage, the most suitable for thin wall, light weight, high strength medicine bottles. PET bottles in China early last century after the advent of 80, then the unstoppable momentum of rapid development. Short 20 years time will become the world's most liquid and solid containers. In the field of pharmaceutical packaging applications, in charge under the same volume, PET bottle weight is only about Glass Bottle of 1 / 10; same diameter bottles, PET bottles bottle capacity is 1.5 times. PET raw material can be used Make Transparent or opaque brown bottle. Secondly, the medicinal PET bottles with good gas barrier. In the commonly used plastic materials, PET bottle barrier water vapor, oxygen, the most excellent performance, can fully meet the pharmaceutical packaging, special storage requirements. PET has excellent chemical resistance, can be used for addition to alkali and some organic Solvent All items outside the package. Third, PET resin utilization was higher than other plastic recycling, waste combustion as a treatment, because its combustion of low caloric value of combustible, and does not produce harmful gases. Fourth, the use of PET manufacture of food packaging comply with food hygiene requirements, since PET resin is not only a harmless resin, but also a pure resin without any additives, by the United States, Europe and Japan, including the very strict Food Sanitation Law of Test , Is considered a qualified and safe drugs and food packaging materials. These advantages make PET bottle to become the leader in plastics. Currently, the world polyester production is to double-digit rate. Polyester as the main raw material of pharmaceutical plastic bottles regardless of appearance, gloss, or physical and chemical properties and quality assurance is now one of the best packaging products.
Pharmaceutical processing technology of PET bottle
1, medicinal properties of polyester raw materials
For bottle blow molding of the polyester (PET) materials to saturated linear thermoplastic polyester, the main application of performance indicators: Intrinsic Viscosity (IV) to be controlled at 70 ~ 85ml / g, so that bottle blow molding high mechanical strength and transparency; for the volume of large (greater than 2 liters) bottles, polyester raw material used for the intrinsic viscosity of 70 ~ 75ml / g. Small volume injection blow molding bottles of medicinal properties preferred a higher viscosity index of material production is appropriate. As the raw material species used correctly or not, related to the production process and molding process parameters for the quality status of this bottle. Therefore, in the production of PET bottles of medicinal raw materials of the intrinsic viscosity, the crystallization temperature, cooling rate and the orientation effect and so process data is particularly important. This is because the polyester material is a crystallizable Polymer , The crystallization rate is very small, only 6 m/min (max). Process control through the crystallization temperature and cooling rate conditions, so that a non-crystalline PET bottle or crystalline, and can change the crystal type and quantity. Crystallinity of PET is generally required about 30%. Slightly above the glass transition temperature or slightly below the melting point temperature, the crystallization rate of PET is small, crystallization takes a long time, the temperature at about 175 , the crystallization time is much shorter. In short, the only crystal by heating to make polyester, the slow crystallization process, are likely to form a large grain crystal ball, which reflects the light, make the product was white, and brittleness. In addition, the crystallization rate of polyester with the increase and decrease their . Ordered arrangement of polyester molecular orientation can promote the crystallization of the crystals formed as strain induced crystal, the grain is small, not reflected light, so orientation of polyester products for the transparency. If part of the crystal orientation of the sample for heat setting of polyester processing, so that further crystallization of the sample is still transparent. Therefore, the crystallization and orientation affect the PET bottle stretch blow molding process to ensure the performance of the key factors. If on the bottle for hot filling and disinfected with a Palestinian-style, but also on the part of the crystallization of the polyester for heat setting treatment, so that further crystallization to improve the heat resistance.
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