Plastic injection mold maintenance items 

Maintenance and servicing of plastic molds include the following items:

1. Check and clean the fixed mold cavity
2. Check and clean the movable mold cavity
3. Inspect and evaluate the surface of the plastic cutting lines between the two mold halves (Color inspection)
4. Check the operation of the product ejection system
5. Inspect the elasticity and quality of the ejection system’s return springs
6. Check the wear and evaluate the quality of the product ejector pins
7. Inspect the wear and evaluate the quality of the mold’s guiding bushings
8. Check and evaluate the quality of the mold’s air venting system
9. Check and evaluate the cooling system of the mold
10. Check and evaluate the plastic injection nozzle

Maintenance and servicing of plastic molds are important factors in optimizing the production efficiency of customers’ products. In reality, the cost of manufacturing a plastic mold has already consumed a significant amount of money. Therefore, proper maintenance of customers’ plastic molds will help extend the lifespan of the molds and ensure product quality.

Performing maintenance on plastic molds correctly

The maintenance of plastic molds is an extremely important factor that helps ensure smooth machine operation and significant time and cost savings. Properly maintaining plastic molds is the foundation for determining the quality of molds for subsequent plastic molding cycles. In this article, we will delve deeper into the issue of maintaining plastic molds in production.

Properly maintaining plastic molds is the basis for determining mold quality.

Common errors often occur when plastic molds are not maintained regularly

Plastic injection molds can be used many times over a long period of time. However, using plastic injection molds for a long time will cause the mold to no longer ensure the same product quality as the original. If plastic injection molds are not carefully maintained, serious deterioration will occur. Common errors shown directly on the product include:

• Deformation, dents, or voids in the product.
• Incomplete filling of the material in the product.
• Surface burn marks on the product.
• Fragility, cracking, or breakage of the product.
• Discoloration of the product.
• Oil sticking to the product.
• Peeling of the plastic surface.
• Flash (excess plastic) on the product.

In addition to these product-related errors, inadequate maintenance of plastic molds can lead to issues with the mold components, such as:

• Broken mold components.
• Oxidized or rusted mold surfaces.
• Worn or deformed components.

Failure to properly maintain plastic molds can have a negative impact on product quality.

To address common maintenance-related errors in plastic molds:

• For surface burn marks on the product, it may be necessary to redesign the mold’s venting system or add additional venting channels. Additionally, attention should be given to designing an appropriate product thickness.
• In the case of fragile, cracked, or broken products, the root cause may lie in the injection nozzle, runner system, or sprue. Therefore, redesigning the plastic injection system is necessary to rectify this issue.
• Peeling of the plastic surface is a serious defect, and products exhibiting this issue should be rejected immediately after molding. The cause can be traced to mold design issues, specifically the need to smoothen sharp edges and corners of the sprue and runner.
• Discoloration of the product is often caused by mold-related factors, and can be addressed by redesigning the runner system to reduce heat friction.
• Flashing is not a severe defect but is the most common issue in plastic molded products. It leads to wasted time and effort in removing excess plastic. To avoid this phenomenon, close attention should be paid to the fit and cleanliness of the parting surface during mold maintenance.

During the process of maintaining plastic molds, specific errors will be identified, and clear and effective corrective measures can be undertaken.

Proper maintenance of plastic molds is an important factor in optimizing the production efficiency of customers’ products.

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