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.
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...viewDirect gate of plastic injection mold runner system design
Jan 19, 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...viewVenting system of plastic injection mold introduction
Feb 27, 2022Hello everyone, thanks for attention. We’ve discussed about the temperature control system earlier, now we are going to talk about the mold venting information in following 11 articles, from the...viewPlastic injection mold common cooling gate
Feb 17, 20221. Straight-through cooling water gate: the straight-through cooling gate is the most commonly used gate for plastic injection mold, and it is also the most convenient type of cooling for processing....viewHydraulic diameter conversion of runners in plastic mold gating system design
Jan 13, 2022Hydraulic diameter refers to 4 times the ratio of the flow cross-sectional area to the perimeter, as the wall shear stress of non-circular pipes is not even distributed along the surrounding walls,...viewThe design requirements of slider wear plate
Jan 2, 20241. The wear plate of slider requires hardening treatment, with a hardness of 45-48HRC; 2. The friction surface of the wear plate is required to be 1.0mm higher than the slider surface (see picture-1);...view