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.


Different treatment of plastic injection mold cooling system principles
Feb 22, 2022Different treatment principle: 1. The mold temperature is different according to the different plastics, when the plastic requires the molding temperature of the mold to be ≥80°C, the mold must be...view
Design Tips of Vacuum Venting Mold
Mar 30, 2022There are some regular venting way which are parting surface venting, insert venting, insert pin venting and well-ventilated steel, but there is a special way is vacumm venting, it will need vacumm...view
The design principle of the exhaust slot
Mar 6, 2022The exhaust system of plastic molds is also very important, if the product has air trapping or exhaust system is not suitable will have a big impact on injection molding production and product...view
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
Venting insert design of molded parts
Mar 13, 2022In the thin-walled cavity, the end of the melt flow, the bottom of the blind hole of the mold cavity, the end of the solid column of the plastic part, the bottom of the plastic part rib and screw...view
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
English
русский



