Technical requirements and tolerance range for blow molded products

The technical requirements and tolerance range of blow molded products mainly include the following aspects:

Technical requirement

1. Mold accuracy: The machining accuracy of the mold, the smoothness of the mold cavity, and the degree of mold wear all have an impact on the size of blow molded parts. The error or uneven wear of the mold cavity can lead to uneven wall thickness of blow molded parts, which in turn affects their dimensional accuracy.

2. Material properties: The shrinkage rate of different types of plastic raw materials varies greatly. Crystalline plastics such as polycarbonate and nylon have much higher shrinkage rates than non crystalline plastics, which can make it difficult to control the dimensional accuracy of blow molded parts.

3 Process parameters: Temperature, pressure, blowing speed, and other process parameters during the blow molding process can also affect dimensional tolerances. For example, excessive temperature can cause an increase in the shrinkage rate of plastic materials, resulting in a decrease in the size of blow molded parts; Insufficient pressure may prevent the product from fully fitting into the mold cavity, resulting in dimensional deviations.

Tolerance range

1. General tolerance: In general, the dimensional tolerance of blow molded products is relatively large, usually between ± 0.5% and ± 2%. The tolerance within this range is considered normal and can meet the usage requirements of most plastic products.

2 Special circumstances: In some cases, the dimensional tolerance standard for blow molded products may be around ± 10%. The tolerance within this range is considered normal and can meet the usage requirements of most plastic products.

Adjustment methods in practical applications

1. Optimize production process: By optimizing production process, improving mold accuracy, and strengthening production environment control, the dimensional accuracy of blow molded products can be effectively improved and tolerances can be reduced.

2. Adjust process parameters: Adjust process parameters such as temperature, pressure, and blowing speed according to specific situations to ensure the quality and performance of blow molded products.

Specific case analysis

For products with high precision requirements, the tolerance range can be appropriately reduced; For some application scenarios with less strict size requirements, the tolerance standards can be appropriately relaxed. In addition, measures such as optimizing production processes, improving mold accuracy, and strengthening production environment control can effectively improve the dimensional accuracy of blow molded products and reduce tolerances.