Causes and Solutions of Rust in Injection Mold
Mold rust is a relatively easy phenomenon, it not only affects the appearance of the mold, but also directly affects the overall quality of the mold, so the mold rust is not allowed to ignore the problem, the following is the analysis of the reasons and measures for your reference.
The reasons for mold rust
First, the products of the decomposition of the molding material.
Second, the return of the mold.
Third, hand sweat.
Correlation analysis of mold rust
First, the decomposition of forming materials products (gas, residue) is the most common corrosion of the mold.In order to prevent mold rust is the most widely used is the mold cavity chromium plating treatment, but the chromium plating treatment can not fully solve the problem, because the decomposition products on the pin hole is very deep part of corrosion, and these places are not plated to the place.
Second, when the mold is cooled below the moisture return point, the moisture in the air will return to the surface of the mold and produce water drops, and rust will occur.
The solution to the problem of mold rust
First, the short term is to use the hand cloth to wipe the surface of the cavity.Dry the molding material sufficiently and lower the cylinder temperature to prevent the material from decomposing.When the molding is stopped temporarily, the mold cavity is sprayed with antirust agent, and then the mold is closed.
Second, the long-term is to decompose the product material into the product of no corrosion of the mold of the material.Easily decomposed materials are PVC, POM, EVA, PC and foaming materials.Because the product of decomposition has a corrosive effect on the mold, the mold should be chromium plated if the plastic raw materials cannot be changed.When the mold is out of use for a long time, apply a layer of butter to the outside and moving parts of the mold.