Plastic injection mold runner system design

The gate is the connecting part between the runner and the cavity, and is also the end part of the injection mold gating system, the molten plastic enters the cavity and core side through the gate directly. The function of the gate is make the molten plastic coming from the runner enter and fill the cavity with core by fast speed, after the cavity with core are filled with plastic, the gate can be cooled quickly and sealed to prevent the hot material in the cavity from flowing material.

The gate design is related to factors such as the part shape, the cross-sectional size of the part, the plastic performance, the mold structure and the injection process parameters. The gate cross-sectio should be small and the length should be short, so as to increase the material flow speed, fast cooling and sealing to separate the plastic parts, and the gate marks are not obvious.

The gate is a key part of the gating system, the gate location, type and size have a big influence on the plastic parts quality, the quality defects of plastic parts, such as air trapping, shrinkage, water trapping, decomposition, washout, deformation, etc., are often caused by unreasonable gate design. The gate is the smallest part of the entire gating system (except for the direct gate of the sprue type) in many cases.


The design content of the gate includes the following 3 points:

①Select the gate location

②Determine the gate type

③Determine the gate size


We will talk about how to determine the location of the gate in following article.


图片1.png

Tags: Injection Mold | Injection Mold Supplier | Injection Mold Factory | Mold Factory | Mold Supplier | Injection Molding |
Related News about USM Injection Mold
  • Plastic injection mold heating

    Plastic injection mold heating

    Feb 16, 2022When the plastic injection molding process requires the mold temperature to be above 80°C, a temperature adjustment system with heating function must be provided in the mold. In addition,...view
  • Design standard of exhaust slot

    Design standard of exhaust slot

    Mar 3, 2022The exhaust system should ensure that the gas in the cavity is smoothly discharged, and also prevent the material from entering and exhausting channels from causing flashing of the product or blockage...view
  • Banana gate of plastic injection mold runner system design

    Banana gate of plastic injection mold runner system design

    Feb 7, 2022In order to get the best injection quality, the gate type must be selected carefully, the coommon gate tyeps are: direct gate, side gate, pin-point gate, sub gate,valve gate of hot runner etc. Among...view
  • The main reasons for air trapping of plastic injecton mold

    The main reasons for air trapping of plastic injecton mold

    Mar 1, 2022During the injection molding process, the front end of the slight ribs may be air trapped and plastic burnt, and also cause the molded part may become black and carbonized. The mechanism of air...view
  • Plastic injection mold runner system design

    Plastic injection mold runner system design

    Jan 16, 2022The gate is the connecting part between the runner and the cavity, and is also the end part of the injection mold gating system, the molten plastic enters the cavity and core side through the gate...view
  • Unique Solutions Mold Profile

    Unique Solutions Mold Profile

    Dec 27, 2021USM (UNIQUE SOLUTIONS MOLD LIMITED) was founded in 2012 and is located in Dongguan City, Guangdong Province, a famous mold manufacturing province in China, the plant covers an area of 3500 square...view