The plastics industry is one of the fastest growing major
industries in the world. Every year there is an increase in the amount of
plastics used in all types of products. A good example of this is the percent
of plastics used in today's automobiles compared to 15 years ago, China is one
of the biggest plastic injection molding manufacturing countries, plastic
injection molding china is rapid in recently years, almost 90% of electric
parts come from China, and lots of parts are need plastic molds
and plastic molding parts.
The plastics injection molding field, at large, is volume
oriented. Vendor sources, particularly mold makers and custom molders, are
geared to long tool life and high volume production. Plastics equipment manufacturers,
likewise, have concentrated almost exclusively on fully automatic,
sophisticated injection molding machines whose economics lie in single runs of
100,000 parts or more and in multi-shift operations.
The continued rate of growth in the industry hinges on the
development of improved and new thermoplastics with greater physical
properties. This has opened the door to applications never thought possible
before. These are emerging both as product innovations and as existing products
converted from materials such as metal, glass, wood or paper to plastics for
competitive and economic advantage.
The Plastic injection molding process
The injection molding process can be
reduced to four simple individual steps: Plasticizing, Injection, Chilling, and
Ejection. Each of those steps is distinct from the others and correct control
of each is essential to the success of the total process.
Plasticizing - describes the
conversion of the polymer material from its normal hard granular form at room
temperatures, to the liquid consistency necessary for injection at its correct
melt temperature.
Injection - is the stage during which this melt is
introduced into a mold to completely fill a cavity or cavities.
Chilling - is the action of removing heat from the
melt to convert it from a liquid consistency back to its original rigid state.
As the material cools, it also shrinks.
Ejection - is the removal of the cooled, molded part
from the mold cavity and from any cores or inserts. Repetition of these basic
steps in sequence is the process of injection molding.
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