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The process principle of rotational molding.
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The basic processing procedure of rotational molding is quite simple: powdered or liquid polymer is placed into a mold, which is then heated while simultaneously rotating around a vertical axis—both spinning on its own axis and orbiting around the central axis. Afterward, the mold is cooled to complete the shaping process. At the beginning of the heating stage, if a powdered material is used, a porous layer first forms on the mold surface; as the cycle progresses, this layer gradually melts and eventually becomes a homogeneous layer of uniform thickness. If a liquid material is used, it first flows and coats the mold surface; once it reaches the gel point, its flow completely stops. The mold is then transferred to the cooling zone, where it is cooled by forced air ventilation or water spraying. Next, the mold is moved to the work area, where it is opened, the finished part is removed, and the mold is then prepared for the next cycle.
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