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Shrinkage Marks in Injection Molding: Causes and Solutions
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Shrinkage Marks in Injection Molding: Causes and Solutions

2024-11-21

1. Causes of Shrinkage Marks Shrinkage marks are usually related to the following factors:

- Material properties: Different plastic materials have different shrinkage rates. Some materials may shrink significantly during the cooling process, resulting in surface defects.

- Mold design: Unreasonable mold design, such as uneven cooling channel layout and improper runner design, may cause uneven cooling of the plastic in the mold, resulting in shrinkage marks.

- Injection molding parameters: Improper settings of parameters such as temperature, pressure and injection speed of the injection molding machine may lead to insufficient filling of the plastic or uneven cooling, causing shrinkage problems.

- Cooling time: Insufficient cooling time may cause the plastic to fail to fully solidify, and the shrinkage caused during the cooling process will leave marks on the product surface. 

2. Effective methods to solve shrinkage marks In order to effectively reduce or eliminate shrinkage marks, manufacturers can take the following solutions:

- Optimize material selection: Select plastic materials with lower shrinkage rates and understand the characteristics of the materials used so that reasonable choices can be made during the design stage.

- Improve mold design: Ensure that the mold design is reasonable, especially the layout of the cooling channels should be uniform to ensure that the plastic can be evenly cooled in the mold. Increasing the thickness of the mold or using rib design can also help reduce shrinkage.

- Adjust injection molding parameters: Regularly check and adjust parameters such as temperature, pressure and injection speed of the injection molding machine to ensure that they are within the optimal range. Properly extending the holding time can help the plastic fill the mold better and reduce shrinkage.

- Extend cooling time: According to the characteristics of the product and the cooling rate of the material, appropriately extend the cooling time to ensure that the plastic has enough time to solidify in the mold and reduce shrinkage caused by uneven cooling.

- Perform mold maintenance: Regularly check and maintain the mold to ensure that it is in good working condition and avoid shrinkage problems caused by mold wear or damage.