Injection Molding: Gate
Before the molten material is injected into the mold cavities, there's a "Gate" as an opening in a mold, it is between the scrap and plastic part.
● What influence the size of the gate
- Weight of plastic part
- Material feature of plastic part
-
Shape of the gate
A. If the gate is under dimension
- Short shot
- Sink mark
- Weld line
B. If the gate is over dimension
- Residual stress around the gate causes deformation and torsion
- Cracking
-
Increasingly difficult to remove the gate
● Gate Type
Gate can be classified into two main types: Unlimited Gate and Limited Gate, Direct Gate represents Unlimited Gate, and there're four types included in Limited Gate, please check below:
A. Side Gate: including Side Gate and Over Lap Gate
B. Tab Gate: including Tab Gate and Fan Gate
C. Film Gate: including Film Gate, Ring Gate, and Disk Gate
D. Point Gate: Point Gate and Submarine Gate (Tunnel Gate)
★ Related articles: | Injection Molding: Hardness of Mold Material |
|
Injection Molding: Chemical Additives |
|
Injection Molding: Defect and Solution |
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