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Basic process of rotational molding


source:Foshan Rotomolding|Rotational Molding Processing|Rotational Molding-Shunde Zhongze Mould date:2020-10-21 14:06

The basic process of rotational molding is very simple. The powder or liquid polymer is placed in the mold, heated and rotated around two vertical axes (rotation and revolution).

Application of mold release agent: mold release agent is applied to facilitate the removal of products from the mold, and can effectively avoid the damage of products during demoulding due to the strong adhesion between the products and the mold.

Installation of inserts and related molding accessories: inserts mainly play the role of local reinforcement of parts. Forming accessories mainly point out the modules used for molding rib or special parts. They must be properly installed in the newly set position before adding materials into the mold;

Loading: strict measurement should be carried out before adding materials, and relevant components should be premixed when additives are needed. Accurately weigh the powder resin required for the final product, add it to the bottom of the separation mold, and then fasten the two half molds together and install them on the bearing shaft;

Mold closing: before closing the mold, pay attention to remove the remaining materials at the mold closing position, and ensure that the two parting surfaces are in good condition to avoid material leakage in the process of processing;

Heating: put the mold filled with materials into the heating furnace (or heat it with gas flame and other heat sources), set the temperature of the heating furnace above the resin melting point, and rotate around the main and secondary axes perpendicular to each other at the same time along with the frame. In the process of rotation, the mold is heated to a given temperature and then kept warm. The material gradually melts under rotation and heating, and settles on the entire inner wall of the mold cavity, and the gas trapped in the material is gradually eliminated until the finished part is formed.

Cooling and shaping: when the resin is fully melted, the mold is transferred to a cooling chamber, where it is cooled by forced ventilation or water spray while continuing to rotate.

Demoulding and mold cleaning: the former should avoid damaging the products during demoulding, while the latter should clean up the remaining materials and sundries on the mold to prepare for the next molding cycle.