What is a blow molding machine
What is blow moulding? Blow moulding is also called hollow blow moulding, a rapidly developing plastics processing method. A tubular plastic parison obtained by extrusion or injection molding of a thermoplastic resin is heated (or heated to a softened state) and placed in a split mold. Immediately after closing the mold, compressed air is blown into the parison to blow the plastic parison. Swelling and close to the inner wall of the mold, after cooling off the mold, that is, all kinds of hollow products. The blown film manufacturing process is similar in principle to the blow molding of the hollow product, but it does not use a mold. From the perspective of the plastic processing technology classification, the blown film forming process is usually included in the extrusion. The blow molding process began during the Second World War to produce low-density polyethylene vials. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach several thousand liters, and some productions have been computer controlled. Suitable plastics for blow molding are polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The resulting empty containers are widely used as industrial packaging containers.
Blow molding machine classification
Blow molding can be divided into extrusion blow molding and injection blow molding according to the production method of the parison. Newly developed blow molding and stretch blow molding are newly developed.
Blowing machine works
After the liquid plastic is sprayed out, the blown-out wind is used to blow the plastic body into a certain shape of the mold cavity to make a product. Such a machine is called a blow molding machine.
The plastic is melted in the screw extruder and quantitatively extruded. Then it is formed through an oral film and then cooled with a fan ring. Then a tractor pulls at a certain speed and the winder winds it into a roll.
The finned tube is to improve the heat exchange efficiency. By adding fins on the surface of the heat exchange tube, the outer surface area (or inner surface area) of the heat exchange tube is increased, so as to achieve the purpose of improving the heat exchange efficiency. Such a heat exchange tube . Usually used for heat exchange between liquid and gas.
Finned tube is a heat exchange element. As a heat exchange element, finned tubes usually work under high-temperature flue gas conditions for a long time. For example, the finned tubes usually used in boiler or harsh environments, high temperature and high pressure, and in a corrosive atmosphere. This requires that the finned tubes should have high anti-corrosion properties, Anti-wear properties, lower contact resistance, higher Stability and anti-dusting ability.
There are many types of finned tubes, and new varieties are constantly emerging. According to the classification of processing technology, there are extruded fin tube; high frequency welded finned tubes; rolled formed finned tubes; suit formed finned tubes ; cast finned tubes; tension wound finned tubes; Inserted tubes.
According to the shape of the fins, there are square finned tubes; circular finned tubes; spiral finned tubes; longitudinal finned tubes; corrugated finned tubes; spiral serrated fins Helical Serrated Finned Tubes; pin-shaped finned tubes; integral plate-shaped finned tubes; inner finned tubes.
According to whether the fin material of the finned tube is the same as that of the base tube, it can be divided into: single metal finned tube, bimetallic composite finned tube.
Single metal finned tubes are classified by material into copper finned tubes; aluminum finned tubes; carbon steel finned tubes; stainless steel finned tubes; cast steel finned tubes.
Finned Tube,Extruded Fin,Brown Fin Tube,Longitudinal Finned Tube
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