How blow molding machine industry defined? Blow, also known as blow molding, plastics processing method of a quick development. The thermoplastic resin obtained by extrusion or injection molding of a tubular plastic parison, hot (or heated to a softened state), placed outside the mold, the mold immediately after closing in the parison pass into the air, blowing the plastic parison expansion and close to the inner wall of the mold, cooled by releasing, to obtain all kinds of hollow products. Blow molding machine industry definition and classification are described below. Blown film manufacturing process in principle and blow molding hollow products are very similar, but it does not use molds, plastic processing technology from the perspective of classification, molding blown film extrusion is usually included. Blow molding process during World War II began for the production of low density polyethylene vials. The late 1950s, with the development of high-density polyethylene birth and blow molding machines, blow molding technology has been widely used. Hollow container volume up to several thousand liters, and some have adopted computer-controlled production. Suitable for blow molding plastic are polyethylene, polyvinyl chloride, polypropylene, polyester, etc., resulting into the empty containers are widely used as an industrial packaging containers.
Blow molding machine industry definitions :
Blow molding machine market research report shows that erupted after the liquid plastic, the use of wind machines blowing out, blowing the plastic body attached to a certain shape of the mold cavity, thereby producing products, this machine is called a blow dryer. The plastic is melted in a screw extruder and quantitatively extruding, molding and film through the mouth, then there blow cooling air ring and traction machine according to a certain pulling speed, winder winding it into a roll.
Blow Molding Machine Industry Classification :
Blow molding machine can be divided into extrusion blow molding machines, injection blow molding machines, blow molding machines and special structure three categories. Stretch blow molding machine can be attributed to each of these classes. Extrusion blow molding machine is a combination of extruder and blow molding machines and clamping mechanism, the extruder and the parison die, inflation means clamping mechanism, parison thickness control system and drive mechanism. Parison die is an important component of the quality of decisions blow moldings, usually have side feed-die and a central feed die. Use more storage material cylinder-type parison die when a large article blow. Storage material cylinder volume a minimum of 1kg, up to 240kg. Parison thickness control means for controlling the parison wall thickness control points up to 128 points, generally 20 to 30 points. Extrusion blow molding machine can produce volume range of 2.5ml ~ 104l hollow article.
Injection blow molding machine is a combination of injection molding and blow molding machines institutions, including plastics, hydraulic systems, electrical control and other mechanical parts. There are three common types of station injection blow molding machines and four-station injection blow molding machine. Three-position machine has a preform, inflation and release three stations, each station separated by 120 °. Four-station machine is more of a pre-forming station, each station separated by 90 °. In addition, between stations separated by 180 ° of the duplex injection blow molding machine. Injection blow molding machine production of plastic containers precise size, no secondary processing, but higher tooling costs.
Blow molding machine is the special structure of the sheet, the melt and cold parison blanks to blow hollow body blow molding machine having particular shape and purpose. Due to the different shapes and require the production of products, blow molding machine structure is also different.