Typically the mould rusting is caused by the gas produced by the melt overheating decomposition. If happened in molding, that is because the corrosion gas existing around rusts the mould. For this reason, we must use a dry and soft cloth to clean the mould when injection molding stops. If don’t need molding production, we should close the mould to prevent gas generated from other injection machines cause corrosion.
When close the mould, please remember to paint grease and do not forget to plug into the pouring type. If do not use the mould for a long time, we should spray anti-rust agent in the mould cavities. And make sure you have cleaned the cavity inside before painting
If there is coated carbide slag on the cavity surface, should be immediately removed. The carbide separates out and decomposes from molding material can easily get mould corrosion, so once discover, we should clean with a dry cloth.
Usually the plating layer in the mould cavity is beneficial to rust protection, but is not fully effective and sometimes the gases get through the air vent of the layer and make depth corrosion. To avoid such rusting, we need clean the mould constantly.
Mould cooling water easy to make plastic mould rust. If the mould cooled to below zero, moisture in the air will be formed water droplets in the mould surface and rust the mould if not erased. Although during the molding process the mould won’t be cooled to below zero, when molding stops, there has condensate water generates immediately. So do not stop production process when injection molding. If have to, we should turn off the cooling water and dry the plastic mould.