Why Is It Easy to Produce Gas or Jet Marks at the Gate of Injection Molding Products?

The reason why the gate of injection molding products is easy to produce gas marks or jet marks may be caused by the following aspects: 1. Uneven plastic flow: The gate is the first place where plastic is injected into the mold, when the plastic flows into the mold, the flow speed, pressure and temperature will change, if these factors are not uniform, it will lead to uneven plastic flow at the gate, forming pores or jet marks. 2. Unreasonable mold design: Mold design is also one of the factors affecting the gas or jet pattern at the gate. If the design of the mold is not reasonable, such as the improper location of the gate, or the mold cavity design is not reasonable, it will cause the plastic flow at the gate to be uneven, resulting in gas or jet marks. 3. Plastic material is not suitable: Different plastic materials have different mobility and shrinkage rates, if the selected plastic material has poor mobility or high shrinkage rate, it is easy to produce gas or jet marks at the gate. 4. Improper processing process: Injection molding is a complex process, if the operation is improper, such as the injection temperature, pressure and speed are set improperly, or the injection cycle is too long, it is easy to lead to uneven plastic flow at the gate, resulting in gas or jet marks.
In view of the above reasons, the problem of gas or jet marks at the gate can be avoided or solved from the following aspects: 1. Adjust injection molding parameters: By adjusting injection molding parameters, such as injection molding temperature, pressure and speed, you can make the plastic flow more uniform and reduce the possibility of gas or jet marks at the gate. 2. Increase the number of gates: In the mold design process, the number of gates can be increased so that the plastic can flow more evenly into the mold, reducing the pressure and temperature difference at the gate, thereby reducing the generation of gas or jet marks. 3. Strengthen mold cooling: In the injection molding process, the temperature of the mold has a great impact on the flow and contraction of the plastic, so strengthening the cooling of the mold can make the plastic flow more uniform, reduce the pressure and temperature difference at the gate, thereby reducing the production of gas or jet marks. 4. Increase the wall thickness of the injection molded parts: Increasing the wall thickness of the injection molded parts can make the plastic subjected to greater resistance during the flow process, thereby reducing the pressure and temperature difference at the gate and reducing the generation of gas or jet marks.

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