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Home » Plastic molding » design fan gate in injection molding

design fan gate in injection molding

July 6, 2019 by mechanicaleng blog 1 Comment

Design fan gate is similar to the side gate, but width of gate  is bigger and has fan-shaped. Used in large size molded product.  It permits rapid filling of large parts or fragile section mold area with large entry area. It is used to create uniform flow into wide parts.

plastic injection molding fan gate design
plastic injection molding fan gate design

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

Post contents

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

1. Advantages and disadvantages of fan gate.

A. Advantages.

+ Making easy.
+ This ensures a constant and more even plastic flow into the cavity into a wide area at a slow injection speed, minimizing back filling and reducing imperfections and stresses in the part.
+ It can use for sample with big thickness and enables slow injection without freeze-off.
+ It can improve bending of product.
+ Melt velocity will be constant.
+ the entire width is being used for the flow.
+ the pressure is the same across the entire width

B. Disadvantages.

Because fan gate have big cross section, so we need to careful in gate cutting. If cutting isn’t good, sample can be scratch, bending.

2. How to design fan gate?

design fan gate of injection mold

This picture above is dimension of fan gate.

+ t: wall thickness of product.

+ T: Thickness of gate where connect with a product. It is usually from 0.5~0.8 part thickness.

+ L: Length of gate.

+ W: With of gate.

+ D: Diameter of runner.

Note: when you design fan gate, cross of runner is circle give the best result.

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

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

Reader Interactions

Comments

  1. Thomas Cameron says

    February 13, 2020 at 8:23 pm

    Hi there,

    I am currently carrying out a thesis into the optimisation of a fan gate and to provide a step by step to achieve optimisation based on my findings.

    I am particularly looking at fan gates and I am using Ansys Fluent CFD to analysis.

    I am decided on varying the main parameters of the gate in order to find the best setup; flow angle, gate height and thickness.

    Any help or information that you could provide me would be greatly appreciated

    Kind Regards,

    Thomas Cameron

    Reply

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