Causes and solutions of rust in injection molds

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. Therefore, mold rust is a problem that cannot be ignored. The following are the reasons for analysis and measures for your reference.

       The reasons for mold rust are:

       1. The product of the decomposition of the molding material

       2. The resurgence of molds

       3. sweaty hands

       Related analysis of mold rust:

1. The most common corrosion of the mold by the decomposition products (gas, residue) of the molding material. In order to prevent the mold from rusting, the most widely used method is to chrome-plated the mold cavity, but the chrome-plated treatment cannot fully solve the problem, because the decomposition products also corrode the deep part of the pin hole, and these places are the places that cannot be plated. .

2. When the mold is cooled below the moisture regain point, the moisture in the air will regain moisture on the surface of the mold and produce water droplets, which will cause rust.

       Solve the problem of mold rust:

1. Short-term: Wipe the surface of the cavity with a cloth by hand. Fully dry the molding material and lower the barrel temperature to prevent material decomposition. When the molding is temporarily stopped, the mold cavity is sprayed with rust inhibitor, and then the mold is closed.

2. Long-term: Turn the product material into a material that does not corrode the mold by the decomposition product. Materials that are easily decomposed include PVC, POM, EVA, PC and foam materials. Because the decomposition product has a corrosive effect on the mold, if the plastic raw material cannot be changed, the mold should be chrome-plated. When the mold is not used for a long time, apply a layer of butter to the outside of the mold and the movable parts.
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