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blown film extrusion
Automatic duplex digital blowing machine
Also known as hollow blow molding, a rapidly developing plastic processing methods. Thermoplastic resin by extrusion or injection molding plastic tube obtained parison, while it is hot (or heated to soften status) , placed outside the mold, the mold immediately after closure at parison with access to compressed air, so that plastic parison blow swell and close up in the mold wall, the cooling Demoulding, that is, all kinds of hollow products. Blown film manufacturing process and on the principle of hollow blow molding products is very similar to, but it does not use molds, plastic processing technology classification from the perspective of the blown film extrusion forming process is usually included in the. Blow molding process during the Second World War began for the production of low density polyethylene vial. In the late 50, with the birth of high-density polyethylene blow molding machine and the development of blow molding technology has been widely applied. Hollow containers or the volume may reach several thousands, and some production has adopted computer control. Applicable to blow molding of plastic has polyethylene, polyvinyl chloride, polypropylene, polyester, etc. , from among the empty container is widely used as industrial packaging containers.