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==== ==== Authority information on the specalized subject of Blow Molds ==== ====

From the literary meaning of a blow molding, the idea that the air or such flow would be employed in this industrial process comes to the minds, I suppose. Generally speaking, a blow molding, also called a blow forming, is a manufacturing process by which hollow plastic parts are formed. Its common process begins with melting down the plastic and forming it into a parison which is tubelike piece of plastic with a hole in one end. Then a pressurized gas, usually air, is used to expand the hot parison and press it against a mold cavity until the plastic cools. And it is time to open up the mold and the part has been made. In fact, it is popular in industrial producing. Or it can be said that blow molding is a multibillion dollar business. It had been counted that the annual worldwide consumption of this term in the late 1980s was about ten billion pounds. With development of the new technologies and enlargement of the applying fields, the demands of the blow moldings are keeping increasing. There is no doubt that the worldwide market of this term continues to be large. It is widely used in a variety of industrial or technical application, such as Toy wheels, automobile seat back, ductwork, surf boards, bellows, fuel tanks, flower pots, automobile bumpers, doublewalled tool cases, and cabinet panels and so on. In general, there are three main types: extrusion, injection and stretch blow molding. Now, some details for each type is given in the following. Considering the first type, the control of wall distribution is the core point. Programming and die shaping are two common techniques used to support the control of wall distribution. During the extrusion, it is important to enable the wall thickness within a die tooling in proper size. Regarding to the injection blow molding, it is usually used for the production of hollow glass and plastic objects in large quantities. It consists of injection molding a thermoplastic material into a parison which is transferred a core rod into a blow mold. Actually, the equipment machine is based on an extruder barrel and screw assembly which melts the polymer. For the last type, it is common seen in the commercial introduction of containers, such as jars and bottles. It is the method of producing a plastic container from a parison that is stretched in both the hoop direction and the axial direction when the parison is blown into its desired container shape. It is popular with the advantages of low tool and die cost, fast production rate, increasing the tensile strength, barrier properties and clarity of the material and reducing weight stretch blow molding produces a container from less raw material and with improved economics and bottle properties.

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==== ==== Authority information on the specalized subject of Blow Molds ==== ====

Blow Molding, forming hollow plastic parts.  

Authority blow mold manufacturing in Shenzhen, China:

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