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What is rotational molding?

October 30, 2023

What is rotational molding?

Rotational Molding, also known as rotational molding or rotational injection molding, is a plastic processing technology used to manufacture hollow plastic products, such as liquid storage tanks, large containers, toys, amusement equipment, boat hulls and other large or Complex parts. Rotational molding is a very flexible process that allows parts to be manufactured in a variety of different shapes and sizes and is particularly suitable for manufacturing large parts and hollow structures.

Here is the basic working principle of rotational molding:

1. Mold loading: First, plastic powder or granules are placed in the mold of the rotational molding machine. This mold usually consists of two or more parts and helps form the desired part shape.

2. Mold heating: The mold is heated, usually in a furnace or using a heating element, to cause the plastic powder to melt and adhere to the inner walls of the mold. The rotation and heating process of the mold causes the plastic to be evenly distributed within the mold.

3. Rotation: Once the plastic is evenly distributed within the mold, the mold begins to rotate, usually on a horizontal or vertical axis. This rotating process results in a uniform coating of the plastic block along the inner walls of the mold.

4. Cooling: While rotating, the mold is usually cooled, allowing the plastic block to gradually solidify and solidify.

5. Mold removal: Once the plastic has completely cooled and solidified, the mold stops rotating and can be opened to remove the finished part.

Key features of rotational molding include the ability to create large, hollow, complex-shaped parts without the use of pressure or injection equipment, the ability to process a variety of different types of plastic materials, and the ability to produce hollow structures without seams or welds. This process is widely used in many fields, such as aerospace, automotive, construction, agriculture, amusement equipment, liquid storage equipment, water treatment equipment and the manufacture of other large or hollow structures. It is particularly suitable for applications requiring high strength, durability and large parts.

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