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PLASTIC
INJECTION
MOLDING
COMPONENTS
FOR
PLASTIC INJECTION MOLDING
What is injection molding ?
Plastic Injection molding is a
method to obtain molded
products by injecting plastic
materials molten by heat into a
mold, and then cooling and
solidifying them.
Injection Molding Machine
Plastic Injection molding machine is divided into 2 units i.e. a clamping unit
and an injection unit.
The functions of the clamping unit are opening and closing a die, and the
ejection of products. There are 2 types of clamping methods, namely the
toggle type shown in the figure below and the straight-hydraulic type in
which a mold is directly opened and closed with a hydraulic cylinder.
Mold
A plastic injection mold part is a hollow metal block into
which molten plastic is injected to from a certain fixed shape.
Although they are not illustrated in the figure shown below,
actually there are many holes drilled in the block for
temperature control by means of hot water, oil or heaters.
Molding
A molding consists of a sprue to introduce molten resin, a
runner to lead it to cavities, and products. Since obtaining
only one product by one shot is very inefficient, a mold is
usually designed to have multiple cavities connected with a
runner so that many products can be made by one shot.
Use of Reprocessed Materials
Sprues and runners among moldings are not products. These
portions are sometimes discarded, but in other cases they are
finely reground and reused as materials for plastic or custom
injection molding. These materials are called reprocessed
materials.
Molding Condition
Molding condition means cylinder temperature,
injection speed, mold temperature etc. set in a
molding machine to obtain required moldings, and
the number of combinations of conditions is
innumerable.
For more Details
on
Molding and Machinery Techniques Visit our
BLOG
www.artetooling.net/blog
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Components of Plastic Injection Molding

  • 3. What is injection molding ? Plastic Injection molding is a method to obtain molded products by injecting plastic materials molten by heat into a mold, and then cooling and solidifying them.
  • 4. Injection Molding Machine Plastic Injection molding machine is divided into 2 units i.e. a clamping unit and an injection unit. The functions of the clamping unit are opening and closing a die, and the ejection of products. There are 2 types of clamping methods, namely the toggle type shown in the figure below and the straight-hydraulic type in which a mold is directly opened and closed with a hydraulic cylinder.
  • 5. Mold A plastic injection mold part is a hollow metal block into which molten plastic is injected to from a certain fixed shape. Although they are not illustrated in the figure shown below, actually there are many holes drilled in the block for temperature control by means of hot water, oil or heaters.
  • 6. Molding A molding consists of a sprue to introduce molten resin, a runner to lead it to cavities, and products. Since obtaining only one product by one shot is very inefficient, a mold is usually designed to have multiple cavities connected with a runner so that many products can be made by one shot.
  • 7. Use of Reprocessed Materials Sprues and runners among moldings are not products. These portions are sometimes discarded, but in other cases they are finely reground and reused as materials for plastic or custom injection molding. These materials are called reprocessed materials.
  • 8. Molding Condition Molding condition means cylinder temperature, injection speed, mold temperature etc. set in a molding machine to obtain required moldings, and the number of combinations of conditions is innumerable.
  • 9. For more Details on Molding and Machinery Techniques Visit our BLOG www.artetooling.net/blog Follow us on FACEBOOK TWITTER