(1) There are two kinds of mold for blow molding of medical bottles: parison mold and blow molding mold, and the mold request is high, so the cost of injection blow molding mold is high, about 2 ~ 3 times that of extrusion blow molding. Injection blow molding is mostly a bottle body with small volume (generally 10 ~ 300ml), which can not form products with disordered shape, and the energy consumption is significantly higher.
(2) In the packaging of drugs, the sealing degree of the bottle mouth of medical plastic bottle directly affects the drug safety and stability during the useful life of drugs. The injection blow molding method is conducive to the specification accuracy of bottle mouth and thread and appearance specification accuracy. The wall thickness of the bottle is uniform. It is used to the requirements of drug packaging and can prevent the drugs in the bottle from being polluted by external substances.
(3) The molding process of polyethylene and polypropylene plastic bottles with high density is mainly extrusion blow molding and injection blow molding. The extrusion blow molding equipment and processing skills are relatively simple. The raw materials are mainly plasticized by the extruder. In the future, the hot blank pipe from the die will be blow molded between the time of the blow mold.
(4) Injection blow molding mainly involves injection molding blank. Its production materials are plasticized evenly in the barrel of the injection molding machine. In the future, after injection molding blank mold, the bottle mouth and thread are directly processed and molded, and the bottle body is directly blow molded in the process of directly transferring the mold core with blank to the blow molding station. The specification accuracy of the bottle mouth and thread of the plastic bottle made in this way is very high.
(5) The shape specification of the plastic bottle body is very stable, so the cooperation between the bottle cap and the bottle mouth is also very precise, which can greatly improve the sealing function of the plastic bottle. Therefore, the plastic bottle produced by injection and blow molding has always been very popular in the pharmaceutical industry.
Among many medical solid plastic bottles, plastic bottle is a kind of packaging container widely used. It is used in many pharmaceutical packaging. Although the quotation of injection blow molding equipment and extrusion blow molding equipment are relatively high, the production quality is very good, the degree of automation is also very high, and the production power is also very high. Most solid polyolefin plastic bottles produced and used in China use injection blow molding equipment, The domestic injection blow molding support machine has gradually reached and approached the level of relevant imported equipment, which provides very good conditions for the production of polyolefin solid plastic bottles. The molding skills of polyester solid plastic bottle mainly use the blow molding skills of injection and stretching. The raw materials of polyester are plasticized and symmetrical in the plastic barrel. In the future, the bottle blank with threaded bottle mouth is produced and processed by injection mold, and then the bottle blank mouth mold is longitudinally stretched through the stretching rod in the blow mold, The strength of the solid plastic bottle made by this method is very high, and the standardized size of the bottle mouth and thread is also relatively accurate. The standardized stability function of the solid plastic bottle body is very strong, the appearance is bright and the transparency is very good, especially for the packaging of liquid and solid drugs.
