At present, polyester production worldwide is increasing at a double-digit rate. The pharmaceutical plastic bottle made of polyester as the main raw material is one of the most ideal packaging products in terms of appearance and gloss, and is still the physical and chemical function and quality assurance. The processing technology of medicinal polyester bottles 1. The characteristics of medicinal polyester raw materials The polyester (PET) raw material used for bottle blow molding is saturated linear thermoplastic polyester. The main application performance index is: Intrinsic viscosity (IV) Should be controlled at 70 ~ 85ml / g, so that blow molded bottles have high mechanical strength and transparency.
PET plastic bottles are used for bottles with a large volume (greater than 2 liters). The intrinsic viscosity of polyester raw materials is 70 to 75 ml/g. It is advisable to use needle-blow-moulded pharmaceutical small-volume bottles with higher intrinsic viscosity. Because the selection of raw material varieties is correct or not, it is related to the selection of molding process parameters in the production process and the quality of the bottle body. Therefore, in the production of medicinal PET bottles, the process data such as intrinsic viscosity, crystallization temperature, cooling rate, and orientation effect of the raw materials are particularly important. This is due to the fact that the polyester material is a crystallizable polymer with a very low crystallization rate of only 6 μm/min (max).
At present, polyester production worldwide is increasing at a double-digit rate. The pharmaceutical plastic bottle made of polyester as the main raw material is one of the most ideal packaging products in terms of appearance and gloss, and is still the physical and chemical function and quality assurance. The processing technology of medicinal polyester bottles 1. The characteristics of medicinal polyester raw materials The polyester (PET) raw material used for bottle blow molding is saturated linear thermoplastic polyester. The main application performance index is: Intrinsic viscosity (IV) Should be controlled at 70 ~ 85ml / g, so that blow molded bottles have high mechanical strength and transparency.
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