Blow molding ( BrE moulding ) is a manufacturing process by which hollow plastic parts are formed. In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and stretch blow molding. The blow molding process begins with melting down the plastic and forming it into a parison or preform. The parison is a tube-like piece of plastic with a hole in one end in which compressed air can pass through.
The parison is then clamped into a mold and air is pumped into it. The air pressure then pushes the plastic out to match the mold. Once the plastic has cooled and hardened the mold opens up and the part is ejected.
Read more about Blow Molding: History of Blowing
Other articles related to "blow molding, molding, moldings":
... Containers such as jars often have an excess of material due to the molding process ... plastic is then recycled to create new moldings ... For example, moldings produced from amorphous materials are much more difficult to trim than crystalline materials ...
... Rotational molding offers design advantages over other molding processes ... In some cases rotational molding can be used as a feasible alternative to blow molding, this is due to the similarity in product outputs, with products such as plastic bottles and cylindrical containers ... tooling, they can be manufactured and put into production much more quickly than other molding processes ...
... For example, in extrusion blow molding it is common to use punching dies to remove tails, molding flash (scrap plastic) and handle slugs from bottles or other molded containers ... containers are usually trimmed in the machines, and finished containers leave the blow molding machine ... Other blow molding equipment, such as rotary wheel machinery, requires the use of downstream trimming ...
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