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.
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Some articles on blow molding:
... 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 ... 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 ...
... Containers such as jars often have an excess of material due to the molding process ... This excess 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 ... manufactured and put into production much more quickly than other molding processes ...
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