Factors causing bottle cap mold to rust


The plastic bottle cap mold market is a market with huge demand, many market segments, and high competitive pressure. More and more manufacturers are joining the plastic bottle cap mold market, and diversified and differentiated plastic bottle caps are constantly changing. However, we do not understand that plastic bottle cap molds are also very easy to rust. So, what is the reason why plastic bottle cap molds usually rust?

Usually, the cause of the plastic bottle cap mold rust is the gas generated after the molten material is overheated and decomposed. If it occurs during the suspension of molding, the corrosive gas existing around the plastic bottle cap mold is mold rust. For this reason, when injection molding is stopped, the mold must be wiped clean with a clean soft cloth. The mold must be closed when it is not forming to prevent corrosion caused by gases generated by other injection machines around it. When closing the plastic bottle cap mold, be sure to apply butter and don’t forget to plug the pouring mold. If the molding is stopped for a long time, anti-rust agent, etc. should be sprayed into the mold cavity. The mold cavity should be cleaned before spraying. Wipe clean with a soft cloth until there are no rust spots.

If there is slag carbide on the surface of the mold cavity, causing the plastic mold to rust, it should be cleaned up in time; the carbide formed by precipitation and decomposition in the molding material often causes wear or corrosion of the mold. Once found, it should be wiped off immediately with a dry cloth. .

Generally, although the electroplating layer in the mold cavity is good for rust prevention, it is not completely effective. Sometimes corrosive gases cause deep corrosion through the pores on the coating surface. The way to prevent the coating from rusting is to wipe the plastic bottle cap mold frequently.

Cooling water flowing through the mold can easily cause the plastic bottle cap mold to rust. If the mold is cooled below zero, the moisture in the air will form water droplets on the surface of the mold, which will cause rust if not wiped off. Although the molding process will not expose the mold, condensation water will be generated immediately after the molding is stopped. Try not to stop the molding during the production process. Even if it is stopped, the cooling water should be turned off and the surface of the plastic bottle cap mold should be wiped dry.

When the above situation occurs, it is necessary to ensure that protective work is done in time to prevent the plastic bottle cap mold from rusting easily.

Post time: Jan-23-2024