The reasons for uneven thickness in blow-molded products are numerous. If the draw gap is uneven, resulting in inconsistent pressure, some areas being larger and others smaller, the extruded product will have uneven thickness. If the air intake is uneven and the air ring is not properly installed, with a significant difference in the product's exposure to wind, uneven thickness will occur. Inconsistent air flow, especially during winter, can lead to uneven thickness. If the workshop has a high air flow, blow molders know that the product cools through air. With a strong air flow, when the air blows onto a product that hasn't cooled completely, some areas may cool first, making those areas thicker than others.

During the blowing process of plastic products, it is inevitable that some products will be不合格, with uneven wall thickness, and sometimes the bottom thickness is also uneven. In response to this issue, we have compiled solutions from customer feedback and collected them to address the common problem of uneven wall thickness in blow molding machines.

One, issues with mold design. Typically, during the mold design process for blow molding machines, an exhaust hole is left at the bottom of the mold. If there are not enough exhaust holes, the product wall thickness will be uneven. In this case, it is necessary to adjust the mold or replace it with a high-quality one.

Secondly, the telescopic rod design is unreasonable. The design of the rod head does not match the bottom shape of the billet, or the rod does not reach the bottom. In this case, a new rod needs to be replaced and adjusted to the bottom of the embryo. The blow molding machine's telescopic rod produced by the Rock Plastic machine features a one-time fixed design, with a well-structured rod design that requires no adjustment, thus preventing uneven wall thickness due to rod issues.

The third issue is excessive product temperature. During the melting and heating of raw materials, the bottom overheats due to insufficient pressure from the stretching rod or excessive stretching pressure, causing the bottom to burst. At this point, it is necessary to adjust the temperature of the heating tubes at the top of the light box to an appropriate level, while reducing the high-pressure blowing time and increasing the cold temperature time.

Four, insufficient blowing pressure or insufficient blowing time can lead to a short duration of force on the tire base, resulting in an unformed tire base. At this point, it is necessary to check if the high-pressure supply meets the blowing standard to appropriately adjust the blowing time.

The product itself has structural design flaws, resulting in an unappealing bottom shape. In this case, it is necessary to optimize the lower design structure of the product.

Here is the common fault of uneven thickness in blow-molded products and the corresponding solutions. Since different blow molding manufacturers have different structural designs, maintenance may vary slightly, but the causes of the faults are the same.