Factors causing rust in bottle cap molds
Published time:
2022-07-28
The demand for plastic bottle cap molds is huge, with many segmented markets and intense competition. More and more manufacturers are entering the plastic bottle cap mold market, driving diversification and differentiation of plastic bottle caps. However, what many don't know is that plastic bottle cap molds are also very susceptible to rust. So, under normal circumstances, what causes plastic bottle cap molds to rust?
The demand for plastic bottle cap molds is huge, with many segmented markets and intense competition. More and more manufacturers are joining the market, driving diversification and differentiation of plastic bottle caps. However, what many don't realize is that plastic bottle cap molds are also prone to rust. So, what are the usual causes of rust formation in plastic bottle cap molds?
Rust in plastic bottle cap molds is usually caused by gases formed by the overheating and decomposition of the melt. If this occurs during suspension molding, corrosive gases around the mold cause rust. Therefore, during suspension injection molding, the mold must be wiped clean with a clean, soft cloth. The mold must be closed before molding to prevent corrosion from surrounding gases and other injection molding machines. When closing the plastic bottle cap mold, always remember to apply grease and insert it during casting. If molding is paused for a long time, apply a rust inhibitor to the mold cavity. Before spraying, wipe the mold cavity clean with a soft cloth to ensure there are no rust spots.
If the mold cavity surface is contaminated with calcium carbide residue, causing the plastic mold to rust, it should be removed promptly. The speculation that carbides precipitate and decompose in the profile often leads to mold wear or corrosion; if detected, wipe it immediately with a dry cloth.
Although general electroplating is a good rust preventative in the mold cavity, it's not entirely effective. Sometimes, corrosive gases can penetrate the plating through pores, causing deep corrosion. The way to prevent plating rust is to frequently wipe the plastic bottle cap mold.
Cooling water inside the mold can easily cause rust. If the mold cools below zero, moisture in the air will form droplets on the outside of the mold, and if not wiped off, it will rust. Although there is no boundary condensation during molding, condensation will occur immediately after suspension molding. Try not to pause molding during production; if you must, turn off the cooling water and wipe the outside of the plastic bottle cap mold dry.
When the above situations occur, protective measures must be taken promptly to prevent the plastic bottle cap mold from rusting.
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