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Most people have never heard of injection molding, however the products

that are produced through this process are as common as a toothbrush, a compact

Injection Molding is one of the principal processes used in converting

plastics into useful products. An injection molding machine can be large or small

but work through the same general process. The machine heats a thermoplastic

material that in its pre-processing state is pelletized or granular, to a liquid-like

"flowable" state. It then injects the melted plastic into a mold that is used to create

the desired shape of the product. The plastic in the mold is then allowed to cool

and removed form the mold by an ejector system.

Different raw plastics materials can be used in the injection molding

process. Most commonly injection molding machines provide process


Through advances in injection molding plastics are becoming more popular

phenolics, melamine, silicone, elastomers and polyester. These materials can be

makes up the last portion of the screw mechanism and is where any final melting

and the clamp unit. The injection unit melts and injects the materials. There are

There are advantages and there are disadvantages to injection molding.

4. The timers stop injection pressure and the screw turns to draw fresh

Some of the advantages are that the surface finish can be controlled to make any

of the pellets occurs before the pellets pass through the non return valve and

screw. It has deep flights and is where the pellets first enter the screw. The

The Clamping unit opens and closes the mold and ejects the parts. The two



Some common words found in the essay are:
Injection Molding, injection molding, molding machines, injection unit, injection molding machines, injection molding machine, zone feed zone, injection molding process, molding process, length screw, feed zone, transition zone, return valve, zone feed, zone makes,

Approximate Word count = 602
Approximate Pages = 2 (250 words per page double spaced)

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