How is Rotational Moulding produced?

Rotational Moulding is a hollow molding method for thermoplastics. The Rotational Moulding method starts by adding the plastic material into the Rotational Moulding mold, and then the Rotational Moulding mold is rotated and heated continuously along two vertical axes. Under the action of gravity and heat, the plastic material in the Rotational Moulding mold is gradually and uniformly encapsulated and melted and adheres to the cavity of the Rotational Moulding mold. The basic process of Rotational Moulding is very simple: a powder or liquid polymer is placed in the Rotational Moulding mold and heated while rotating around two vertical axes (rotary and swivel). So, how is Rotational Moulding produced? Let's take a look next.

This is the content list:

• Apply release agent and install inserts and related molding accessories

• Loading and demolding

• Heating, cooling, and shaping

• Demolding and cleaning the mold

  
  

Apply release agent and install inserts and related molding accessories

The release agent is coated on the Rotational Moulding mold to facilitate the removal of the product from the Rotational Moulding mold, and at the same time, it can effectively avoid product damage during the Rotational Moulding due to the large adhesion between the product and the Rotational Moulding mold. Roto molding inserts mainly play the role of local reinforcement. The molding accessories mainly point out the ribs or modules for special part molding. They must be properly installed in the newly set position before the Rotational Moulding mold is filled with materials.

Loading and demolding

Roto molding materials should be strictly metered before adding materials. When additives need to be added, the relevant components need to be premixed. Accurately weigh the weight of the powder resin required for the final product, add it to the bottom of the separable Rotational Moulding mold, and then fasten the two mold halves together and install it on the supporting shaft. Before Rotational Moulding the mold, pay attention to removing the remaining materials at the mold clamping position and ensure that the two parting surfaces are tightly sealed to avoid material leakage during the processing.

Heating, cooling, and shaping

Put the Rotational Moulding mold filled with materials into the heating furnace (or use other heat sources such as gas flame to heat), set the temperature of the heating furnace above the melting point of the resin, and rotate the main and auxiliary shafts perpendicular to each other along with the frame at the same time. During the rotation, the Rotational Moulding mold is heated to a given temperature and then kept warm. The material is gradually melted under rotation and heating and settles on the entire inner wall of the Rotational Moulding cavity, and gradually removes the gas trapped in the material until the molding is complete. When the resin is fully melted, the Rotational Moulding mold is transferred to the cooling chamber and cooled, where it continues to rotate while being cooled by forced ventilation or water spray.

Demolding and cleaning the mold

The former is to avoid damage to the product during the molding of the Rotational Moulding, and the latter is to remove the residual materials and debris on the Rotational Moulding mold to prepare for the next molding cycle.

Shanghai Jingyao Industrial Co., Ltd. is committed to providing customers with better services. Before the products leave the factory, a large number of product tests are carried out. If you are interested in Rotational Moulding, you can contact us. Our website is www.shanghai-rotomolding.com/, very much looking forward to your arrival.