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Home » Plastic molding » design ring gate in injection mold

design ring gate in injection mold

July 10, 2019 by mechanicaleng blog Leave a Comment

Design ring gate of injection mold is special of disk gate. It is used for cylindrical or round parts in a multi cavity mold or when a diaphragm gate is not practical.  Melt materials enter the mold by by ring gate can improve weld line defect.

There are 2 main types of ring gate: inside and outside.

design ring gate shape

You can read all the content about gate design at here.

Post contents

  • 1. Advantages and disadvantages of ring gate.
    • A. Advantages.
    • B. Disadvantages.
  • 2. How to design ring gate?

1. Advantages and disadvantages of ring gate.

A. Advantages.

+ To prevent weld line of product.

+ Resin fill in molding cavity easily and have good quality.

+

B. Disadvantages.

+ Gate cutting is difficult.

+ Mold making is more expensive.

+ We lose many resins for a runner and gate.

2. How to design ring gate?

2.1. Dimension of ring gate with circular cross-section.

D: Thickness of feed runner. D=(s + 1.5) mm ~  (4/3 s + k) mm

L: Length of ring gate, L= 0.1~1.5 mm.

s: Thickness of cylindrical or round parts.

H: Thickness of ring gate, H= 2s/3 ~ 2 mm.

r= 0.2*s.

k = 2 mm for short flow lengths and thick sections.
k = 4 mm for long flow lengths and thick sections.

 

Ring gate with circular cross-section

2.2. Dimension of internal ring gate.

D: Thickness of feed runner, D= s+1.5 mm

s: Thickness of cylindrical or round parts.

Length of gate: 0.5~1.5 mm. Width of gate 1~2 mm.

dimension of internal ring gate

 

You can read runner design at  https://mechanicalengblog.com/plastic-injection-molding-runner-system/

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Filed Under: Plastic molding Tagged With: gate design, injection molding design

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