How to use the rotational molding process to reduce defects in rotational molded products?
Adjust the spacing between the strip produced by the ventilation pipe or metal wire that has no significant impact and the inside of the mold. Ventilation pipes are generally made of thin metal fluoroplastic pipes, and their diameter is determined by the finished product specifications and material functions. (Generally, thin-walled products are set with a diameter of 10-12mm per cubic meter of mold.) The length of the pipeline should be determined by the depth of the finished product's concave mold. The end of the inspection port should extend into the middle of the mold core or to a suitable location. To prevent resin powder from overflowing from the exhaust pipe when the mold is twisted, the vent pipe needs to be filled with glass fiber, steel velvet, graphite (chemical formula C) powder, etc. Summarize the application of various release agents in the mold, using the alias "Plastic King, Hala" (polytetrafluoroethylene) to replace the coating (replacing another material with one material (often seen in the position where the strong replaces the weak), and connect the mold interior to dryness. In addition to the oil storage tank, the roll molded military oil tank also plays a role in heat removal, separation of bubbles in the oil, and settling of impurities in the hydraulic system. If it is affected by the identity of the embedded parts, preheating can be stopped for the embedded parts and surrounding departments and regions.
Rotational molding process
In the process of product and mold design, the following methods beneficial to eliminating bubbles or pores should be taken into full consideration: using materials with high melt activity speed, using materials with low density (module: g/cm3 or kg/m3), improving the average value of mold wall thickness, increasing natural cooling time, delaying spray (water spray) cooling, and the ribs or protrusions on the finished product should not be too narrow or too high (corresponding to the groove on the mold should not be too narrow or too deep). The roll molded military fuel tank must have sufficient capacity to meet the heat removal requirements as much as possible.