Bottles, barrels, cans, boxes and other plastic products of various shapes and different volumes in plastic products are used to package various foods, beverages, medicines, condiments, cosmetics, daily chemicals, chemical packaging containers and other items. They are the indispensable plastic packaging containers in our daily life.
Several plastic molding processes are used in the production of these plastic products, including injection molding, blow molding, etc. They have different advantages and features in processing various plastic products due to differences in raw materials, processing requirements, yields and their costs.
Extrusion blow molding, or EBM is a manufacturing process to plasticize and melt the raw materials for the product in an extruder, then extrude the melt to form a parison, and then inflate the parison to form a product.
Extrusion blow molding, mainly for unsupported parison processing. Its entire molding process can be divided into three stages: parison formation, parison inflation, cooling and solidification. Extrusion blow molding is one of the main molding methods for the production of plastic hollow parts, suitable for PE, PP, PVC, thermoplastic engineering plastics, thermoplastic elastomers and other polymers and various blends. Most blow molded products are formed by extrusion blow molding.
The injection blow molding(IBM) method is to use raw materials to plasticize and melt in an injection molding machine, and then inject the molten material to form a parison, and then move the parison to a blow mold while it is still hot.
The products produced by injection blow molding are mainly small bottles with a single shape, which can be produced with various resins such as PVC, PE, PE, PS, PET, and PA. Mainly used for the packaging of medicine, food, cosmetics, etc. The types of plastics used for blow molding hollow objects are PE, PVC, PP, PS, PET, PC, PA. Among them, the consumption of HMWPE occupies the first place. It is commonly used in the packaging of food, chemicals and handling liquids.
Stretch blow molding(SBM) is developed on the basis of the above two molding methods, including extrusion-stretch-blow molding and injection-stretch-blow molding(ISBM).
Stretch blow molding is to stretch the extruded or injection molded parison longitudinally first (with a stretching mandrel or a stretching jig), and then inflate the molded product. Because plastic products formed by this method are stretched in both longitudinal and transverse directions, their physical and mechanical properties are improved.
In addition to the above commonly used plastic molding methods, there are other molding processes, including multi-layer blow molding, compression blow molding, dip coating blow molding, foam blow molding, three-dimensional blow molding, etc. They are used to produce some delicate, small batches of plastic products.
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