Brief analysis of the process characteristics of rotational molding

Brief analysis of the process characteristics of rotational molding

Rotomolding, along with injection molding and blow molding, is a plastic molding process. In the rotomolding process, powdered plastic is placed in a mold, which is then rotated and heated simultaneously. The powder gradually melts and adheres to the mold cavity. After cooling and setting, the plastic product is produced. The concept of rotational molding originated in the United Kingdom, with the first rotational molding patent issued in 1855. At this time, plastic had not yet been invented. The first rotational molding machine was manufactured in 1934, using the polyvinyl chloride rotational molding process to produce products such as plastic balls and children's toys. Starting in the 1960s, my country used rotational molding to produce soft polyvinyl chloride pellets and rotomolded polyethylene containers with volumes of 200L and 1500L. Rapid development began in the 1990s.

Features of Rotomolding:

1. Suitable for manufacturing large and extra-large products.

2. Wide selection of equipment and molds, offering strong adaptability.

3. Products are molded in one go, free of internal stress, less prone to deformation, seamless, and high in strength.

4. Suitable for producing a wide variety of products in small batches.

5. Suitable for molding hollow products with complex shapes.

6. Conserves raw materials and allows for easy color changes.

Rotomolding is a unique processing method. With the continuous enrichment and advancement of raw materials, molds, and molding technology, the rotomolding process will continue to improve, becoming an increasingly competitive plastic molding method. Its product development and application holds enormous potential.