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Take you through the process of rotational molding processing

Release Time:2023-09-28 11:09:28

Rotational molding, also known as rotational molding or rotational casting molding. It is a hollow forming method of thermoplastic. Rotational molding is a versatile process for manufacturing various hollow plastic parts. The rotational molding process utilizes heating and rotation along two axes to produce hollow individual parts. The melted plastic is injected into the rotating mold, and centrifugal force forces the melted plastic to adhere to the inner wall of the mold. Firstly, powder or paste materials are injected into the mold, and through heating and vertical and horizontal rolling rotation of the mold, the materials evenly fill the mold cavity and melt under their own gravity and centrifugal force. After cooling, they are demolded to obtain hollow products. Due to the low rotational speed of rotational molding, the equipment is relatively simple, and the product has almost no internal stress, making it less prone to deformation, dents, and other shortcomings. Initially, it was mainly used for the production of small products such as toys, leather balls, bottles, and cans made of PVC paste plastic. Recently, it has also been widely used in large products, with resins such as polyamide, polyethylene, and modified polystyrene polycarbonate.

Rolling plastic processing plant

Rotational molding is similar to a molding method of rotary casting, except that the material used is not liquid, but sintered dry powder. The process involves loading the powder into the mold and rotating it around two mutually perpendicular axes. Heating and uniformly melting on the inner wall of the mold form a whole, and then cooling can obtain hollow products from the mold.

Rotational molding is also known as rotational molding or rotational molding. Adding powdered plastic (such as LLDPE) to a closed mold, the mold is heated while rotating, and the plastic melts and evenly adheres to the surface of the mold cavity. After the mold cools down, plastic hollow products with the same shape as the mold cavity can be obtained, such as ships, boxes, barrels, pots, cans, etc. It usually consists of basic steps such as feeding, mold sealing, heating, cooling, demolding, and mold tool cleaning. This method has the advantages of low product shrinkage, easy control of product wall thickness, and low mold cost.

During the entire production process of rotational molding, the speed of mold rotation, as well as the heating and cooling time, must be strictly and accurately controlled. Compared to other mold processes, rotational molding provides us with more design space. Under the correct design concept, we can combine several parts into a complete mold, which greatly reduces the high assembly cost. The rotational molding production program also includes a series of inherent design thinking methods, such as how to adjust the thickness of the side walls and how to strengthen external settings. If there is still a need to add some auxiliary designs, we can also add the strengthening rib line to the design. Rotational molding has injected designers' endless imagination into the product


  • Name:Mr. Ye
  • Tel:+8618136719595
  • Address:No. 68 Zhongxiang Road, Huangchengdun Industrial Park, Chunjiang Town, Xinbei District, Changzhou City