How does the design of the parison mold affect the uniformity of the wall thickness of the final product during the injection blowing process?
Publish Time: 2025-02-20
During the injection blowing process, the design of the parison mold has a significant impact on the uniformity of the wall thickness of the final product. This impact is mainly reflected in the following aspects:
The complexity and number of mold structures: The complexity and number of mold structures will directly affect the wall thickness of the product. If the mold structure design is too simple or the number of molds is insufficient, it may cause uneven wall thickness of the product. Complex mold structures can better control the flow and distribution of resin in the mold, thereby helping to form products with uniform wall thickness.
Design of mold cavity: The shape, size and precision of the mold cavity will directly affect the wall thickness of the blow molded product. Reasonable cavity design can ensure that the resin can be evenly distributed after being injected into the mold, avoiding local over-thickness or over-thinness. In addition, the precision of the cavity will also affect the uniformity of the wall thickness of the product. High-precision cavities can ensure the consistency of the wall thickness of the product in multiple productions.
Design of vents: In the injection blowing process, the design of vents is crucial. If the number of vents is insufficient or the position is inappropriate, the gas in the mold cannot be discharged smoothly, which affects the flow and distribution of the resin and eventually leads to uneven wall thickness of the product. Therefore, reasonable vent design is one of the key factors to ensure the uniformity of product wall thickness.
Treatment of mold surface: The finish and roughness of the mold surface, as well as the cleaning, maintenance and repair during use, will directly affect the surface smoothness and wall thickness uniformity of the product. If the mold surface is improperly treated or poorly maintained, the friction coefficient of the mold surface will change, which will affect the flow of the resin and the wall thickness uniformity of the product.
In summary, the design of the parison mold plays a vital role in the injection blowing process, which directly affects the wall thickness uniformity of the final product. Therefore, various factors need to be fully considered in the mold design process to ensure that the mold can meet the quality requirements and production efficiency requirements of the product. By optimizing the mold structure, cavity design, vent design and mold surface treatment, the wall thickness uniformity and overall quality of the product can be significantly improved.
