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Details of mold design in rotational molding process

By admin In Art, News Posted 2023-03-29

Cleaning of barrel, screw and accessories in order to avoid environmental pollution of raw materials and the existence of leftover materials or residues in the concave of screw and accessories, especially the resin with poor thermal stability, screw cleaning agent is used to clean all parts before application and after shutdown, so that they can not be stained with residues. When there is no screw cleaning agent, resin such as PE and PS can be used to clean the screw.

In case of temporary shutdown, in order to avoid long residence time of raw materials at high temperature, resulting in temperature drop, the temperature of dryer and barrel should be reduced, such as PC, PMMA and barrel temperature should be reduced to below 160 ℃. (the silo temperature should be below 100 ℃).1611283499984428Problems that should be paid attention to in the mold design of rotational molding (including the design of commodities) in order to prevent poor backflow or uneven refrigeration, resulting in poor plastic forming, surface defects and mildew, the following points should be paid attention to in the mold design:

A = the wall thickness should be as uniform as possible, and the die inclination should be large enough;

B = the connection should be gradual. Smooth connection, avoid oblique angle. Sharp edges, especially PC products must not have vacancies;

C = gate. The runner should be as wide and short as possible, and the gate should be set according to the condensation process. If necessary, the cooling well should be added;

D = the surface of the die should be smooth with low roughness (at best less than 0.8);

E = vent. The tank must be sufficient to discharge the gas and the gas in the solution;

F = except pet, the wall thickness should not be too thin, generally not less than LMM.

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