Rotational Molding Products About Product Design

The rotational molding process can produce many different types of hollow plastic products, but how to make the products more suitable for the rotational molding process requires designing rotational molding products that meet the requirements of the rotational molding process, so that the rotational molding products can give full play to their best qualities. As for the effect, the following is the experience accumulated by Dongguan Keshan Rotational Molding Equipment in the rotational molding industry for many years. I hope it will be helpful to the rotational molding colleagues.

1. In the direction the product comes out, does the design include a deep side sink? If so, they must be designed externally or as removable inserts, so tooling costs increase. Some small dents are negligible due to shrinkage of the plastic. But to know how deep the dent is, no additional mold is needed.

2. How many pieces of mold are there? In standard cases, there are two molds, but if the design of the product is more complex, multiple molds may be required. This affects the cost of the mold, the maintenance of the mold and the cost of a single piece of plastic.​

3. What kind of surface treatment is required for the product, whether it is cast on the surface of the mold or processed on the casting mold. The different degrees of surface treatment not only have a great impact on the cost of the mold, but sometimes specific surface treatments can also affect the demoulding of the product.​

4. Is there an area between the two walls of the product where the resin does not flow well? What is the distance in this area. If the distance is long, the surface treatment of the mold here will be difficult and increase the cost. If it is narrow, it will be difficult or impossible for resin to flow into the cavity.

5. Are the rounded corners in the design large enough to allow the resin to flow freely to every part of the mold. What is a sufficient corner radius?

6. Whether to use inserts to attach other parts to plastic products. What is the location of the inserts and will they maintain their condition during the molding operation.​

7. Where is the parting surface of the mold? Sometimes the aesthetic needs of the product and the actual requirements of mold making differ on the parting surface issue.​

8. If the product wall has high requirements for pressure resistance, whether to design reinforcing ribs or a "kiss-shaped" structure on the product.

9. The corners of rotational molded products should be designed to be rounded, not sharp or right-angled. Rounded corners aid the flow and shaping of raw materials. The larger the fillet, the more uniform the corner wall thickness will be. , the better the shape. Pay attention to the dimensions of the rotomolding mold. Generally speaking, the shrinkage rate of rotational molded products is about 3%. If rotational molding products require high dimensional accuracy, raw material parameters, product internal structure, mold material shrinkage, etc. should also be considered for analysis and adjustment.