Explain three plate mold injection process
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Three plate mold
3 plate mold is also named as small gate mold, comparing with 2 plate mold, one of the differences is additional mold plate is required between top clamp plate and cavity plate, which called runner plate, it allows the runner scrap and plastic molded partsreleased separately, see below figure of three plate mold structure.


Another difference is 3 plate mold require 3 times opening.
The first time opening, see below figure.

The second time opening is to release the molded parts, see below figure.

The third time opening is to release the runner automatically.

Three plate mold is usually employed when the part is too big and need multiple injection points. Three plate mold design has more advantages to locate the gate.
But usually 3 plate mold is not recommended as there are some disadvantages, it's not just because of a much more complex structure but much higher scrap rate, it's also lack of stability because of complex mechanism. It's random to use for high volume production because it required longer cycle time and bigger injection molding machine as the run distance is longer comparing with 2 plate mold.
if u want to diagram you can serch on google and go to second website
3 plate mold is also named as small gate mold, comparing with 2 plate mold, one of the differences is additional mold plate is required between top clamp plate and cavity plate, which called runner plate, it allows the runner scrap and plastic molded partsreleased separately, see below figure of three plate mold structure.


Another difference is 3 plate mold require 3 times opening.
The first time opening, see below figure.

The second time opening is to release the molded parts, see below figure.

The third time opening is to release the runner automatically.

Three plate mold is usually employed when the part is too big and need multiple injection points. Three plate mold design has more advantages to locate the gate.
But usually 3 plate mold is not recommended as there are some disadvantages, it's not just because of a much more complex structure but much higher scrap rate, it's also lack of stability because of complex mechanism. It's random to use for high volume production because it required longer cycle time and bigger injection molding machine as the run distance is longer comparing with 2 plate mold.
if u want to diagram you can serch on google and go to second website
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