Injection molding problem: Injection molding short shot

author: Universe plastic

2024-04-24

Injection molding short shot is one of the common injection molding problems. The mold cavity is not completely filled when the molten plastic is injected, resulting in parts of the finished plastic being missing or incomplete.

Short shots in injection molding can cause serious quality problems in plastic products, which need to be solved by adjusting injection parameters or optimizing mold design.

Universe Plastics Engineers will analyze the causes and solutions of short shots in injection molding:

Causes of short shots in injection molding

1. Injection molding parameter setting error

During injection molding, the parameter settings of the injection molding machine are very important, such as injection speed, injection pressure, injection volume, etc., which can lead to the occurrence of short shots in injection molding.

2. Injection molding machine failure

The injection molding machine is an important tool for performing the injection process. If its injection molding system malfunctions, resulting in insufficient injection accuracy and insufficient pressure, it will lead to short shots.

3. Plastic melt has poor fluidity

If the plastic melt material for injection molding has poor fluidity, it will not be able to fill the mold cavity smoothly, resulting in a short injection shot.

4. Unreasonable mold design

If the mold design is unreasonable, such as the injection gate is too small or the flow channel and exhaust design are wrong, the plastic will not be able to completely fill the mold cavity and a short shot will occur.

Injection molding machine injection system

How to Solve Short Shots in Injection Molding

1. Adjust injection molding parameters

By increasing the injection pressure, adjusting the injection speed, and adjusting the mold temperature, the plastic melt can quickly and completely fill the mold cavity and reduce the phenomenon of short shots in injection molding.

2. Check the injection molding equipment

Conduct a comprehensive inspection of the injection molding equipment to check the operation of the injection molding system, such as whether injection pressure, injection speed and other functional parameters are normal.

3. Improve injection molding materials

Add flow aids to use plastic materials with better fluidity and lower viscosity. Or replace the material with better fluidity, preprocess the material in advance, completely dry and filter, remove impurities, etc.

4. Optimize mold design

Optimize the design of mold gates, runners, exhaust, mold cavity smoothness, etc., and use computers to conduct injection simulations to eliminate short shot problems in injection molding.

Summarize

In actual injection molding production, if you encounter the problem of injection short shot, it is recommended to determine the actual cause based on the injection molding environment and plastic material characteristics to ensure the fastest solution to the problem.

It is important to pay attention to factors such as equipment operation, material supply, plastic fluidity, mold design, and exhaust conditions. These are the main causes of short shot problems in injection molding.

Dongguan Universe Plastic Factory has more than 15 years of injection molding production experience. If you have injection molding needs or questions, you can contact us at any time.

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