Posted by
putianjixie on Tuesday, May 26, 2009 10:24:12 PM
Blow molding, also known as blow forming,
is a fast-developed manufacturing process by which hollow plastic parts are
formed from thermoplastic.The basic process has two fundamental phases. First, a
preform (or parison) of hot plastic resin in a somewhat tubular shape is
created. Second, a pressurized gas, usually air, is used to expand the hot
preform and press it against a female mold cavity.
History
In the second war,the Blow Molding Process is
used to produce low density polyethylene vial.While in late 50th,the blow
molding technology is widely used with the naissance of high-density
polyethylene and development of blow
molding machine.
Material
The material always used are:Polyethylene,
polyvinyl chloride, polypropylene, polyester and so on.And the products is
widely used as industrial packaging
containers.
Category
In general, there are three main types of
blow
molding: extrusion blow molding, injection
blow molding, and stretch blow molding.