Q&A: Basic Introduction of Mold

There are two main types of plastic Injection Mold:
Two plates Mold and Three plates Mold

A. Two plates Mold
Two plates mold is the mold whose sprue, runners, gates, and cavities are all on the same side of the mold  , divided by the parting line into moving half and fixed half.

The features for Two Plates Mold are:
1.Simple structure, easy to operate, and satisllietory to have the plastic part to drop off freely.
2.Minimal operational probIems, long lifespan, and shortened molding cycle.
3.Inexpensive mold cost.
4.Easier to choose gate shape and location for the two pate mould.
5.Other than direct gates, gate location is limited to the side of the plastic part with certain exceptions.
6.After molding, there is need to cut off the gate from the part.


B. Three plates Mold
Three Plates Mould is a mold which has a runner plate in betteen moving half and fixed half. The runner exists between the runner plate and the fixed half. The cavity is located in between the runnerplate and moving half of the mold. Pin-point gates typically locate at the middle of the plastic part, away from its edge. satisfying the aesthetic requirement and eliminating the process tot cutting off the gates.

A Three Plates Mold has the following features:
1.Its gates can be located at the middle of the plastic part.
2.It allows pin point gates.
3.It may eliminate cutting off the gates manually, when pin-point gates or submarine gates are used.
4.It has to take out both tile part and the runner respectively.
5.The Injection Molding machine should have sufficient mold opening distance.
6.It has a complex structure, more problematic and less durable.
7.It carries a higher mold cost than two plate mould.
8.It has a longer molding cycle than two plate mould. 




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