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Blowing Mould Technology Is The Third Largest Plastic Processing Technology In The World
Oct 13, 2017

Blow molding is a method of making hollow thermoplastic parts. The widely-molded objects are containers of bottles, barrels, cans, boxes and all packaged food, beverages, cosmetics, pharmaceuticals and daily necessities. Large blow moulding containers are usually used in the packaging of chemical products, lubricants and bulk materials.

Other blow moulding products include balls, corrugated tubes and toys. For the automotive industry, fuel tanks, car shock absorbers, seat backs, center brackets, and armrest and headrest cover are all blown plastic. For machinery and furniture manufacturing, blow molding parts have housings, door frames, racks, pottery cans or boxes with an open face.

The most common blow-moulding extruded plastic material is high-density polyethylene, which is usually made of this polymer. Other polyolefins are also often processed by blow moulding. Styrene polymers, polyvinyl chloride, polyester, polyurethane, polycarbonate and other thermoplastic plastics can also be used for blow molding. Engineering Plastics have recently been widely accepted in the automotive industry. Material selection is based on mechanical strength, weathering resistance, electrical properties, optical properties and other properties.

Blow molding technology is the world's third largest plastic processing technology, widely used in the production of materials for thermoplastic hollow thin-walled objects. In the past more than 20 years, blow molding technology has experienced rapid development, has been automotive, sports and leisure, electronic products, office supplies, automation equipment, packaging industry and other fields of application.

In general, there are two main types of blow molding: Extrusion blow molding and stretch blow molding. The former is widely used in the production of various sizes and shapes of containers, but also for the production of irregular and complex hollow parts, the supply of automobiles, office automation equipment, medicine and tourism and other fields. The latter is widely used in the production of commercial plastic bottles, suitable for food, beverages, pharmaceutical industry and other fields.

Blow molding product design, processing, injection process and design blow molding die is an important stage in the development of blow molding products, in addition to the high complexity of mold structure, the interference of various design parameters also makes the design task very difficult. So most people still believe. Blow molding technology of hollow blow molding mould plays an important role in die design.

Blow molding is a rapid development of plastic processing methods. Blow Moulding process during World War II, it was used to produce low-density polyethylene vials. In the late 50 's, with the emergence of high-density polyethylene and blow molding machine development, blow molding technology has been widely used. The volume of the hollow container can reach thousands of litres, Some production has adopted computer control. Suitable for blow molding plastics have polyethylene, polyvinyl chloride, polypropylene, polyester, and so on, the empty containers are widely used as industrial packaging containers. According to the production method of Parison, blow molding can be divided into extrusion blow molding and injection blow molding, the new development of multi-layer blow molding and tensile blow molding.

Proper maintenance of blow molding molds (machinery should be regularly cleaned, especially extruder screw and head) and keep the machine, raw materials and workshop clean and clean, help to ensure the normal blow molding. So how to maintain and maintenance?

Cleaning of Parison head. Keeping the clean of the billet head is an important prerequisite for extrusion blow moulding high performance products. Some polymers are degraded during processing, especially when the melt is in the storage chamber for a period of time when the processing temperature is higher or when intermittent blow molding occurs. In addition, the blow-moulding polymer contains a variety of additives, the melting process will be formed by-products. These degradation or by-products will accumulate in the head runner, so that the surface of the parison appears stripes, affecting the appearance of the product. The flow path of the nose is streamlined or chrome plated to reduce the appearance of parison stripes. The effect of the Parison stripe on the appearance of the product can be properly offset by the high temperature of the parison in contact with the blow moulding mold cavity. During the production process, the aggregate of the die mouth can be removed with copper sheet, and sometimes the stripes on the Parison are eliminated. If not, the downtime will be fully cleared.