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Home » Plastic molding » design disk gate in injection molding

design disk gate in injection molding

July 9, 2019 by mechanicaleng blog Leave a Comment

We usually design disk gate if shape of a product is a trough hole sleeve like moldings, which need a mounting of the core at both ends. It Used in the case of single cavity, or when placing the gate directly to the base of the molded product. Residual strain tend to occur because the injection pressure will directly apply to the molded product. Mold construction is the simplest. The disk can be of a plane circular shape  or a cone usually with 90° taper.

 

disk gate shapre injection molding
You can read all the content about gate design at here.

Post contents

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

1. Advantages and disadvantages of disk 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 resin for runner and gate.

2. How to design disk gate?

+ When we use disk gate for mold design,  the ratio between the length of the core and its diameter should be smaller than 5

L/D <5

+ If the core is longer, it has to be supported on the injection side to prevent shifting caused by a pressure differential in the entering melt. In such cases a ring gate should be employed.

Conical disk gate with openings for core support

Dimension of disk gate.

A. Disk gate type 1.

+ t: thickness of gate, t=0.1~0.17mm

+ T: Thickness of disk, T – 5~10 mm.

+ D: Inside diameter of through hole.

+ d: diameter of disk gate.

D-d = 2~10 mm

 

disk gate type 1

B. Disk gate type 2.

+ L: Length of gate, L < 1mm

+ T: thickness of gate, T = 1.5~3mm

disk gate type 2

C. Disk gate 90° taper.

S: Thickness of product.

Disk gate 90° taper

 

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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