Causes and Solutions for Rust on Plastic Molds
There are several main causes of rust on plastic molds:
Breakdown products of molding materials: When heated, plastics can decompose to produce gases and residues, which have a corrosive effect on molds.
Mold condensation: When the mold temperature is lower than the dew point of the air, moisture in the air will condense on the surface of the mold, causing rust.
Cooling water: The cooling water used in injection molds may contain impurities that accelerate mold rust.
Release agents: Some release agents contain acidic or alkaline substances that can also corrode molds.
Rust on plastic molds can cause the following problems:
Affect the quality of molded parts: Rusty molds may leave rust spots on the surface of molded parts, affecting the appearance and quality of molded parts.
Reduce the service life of the mold: Rust can accelerate the wear and corrosion of the mold, reducing its service life.
Increase production costs: Rusty molds need to be repaired and replaced frequently, which can increase production costs.
To prevent rust on plastic molds, the following measures should be taken:
Choose the right molding materials: As much as possible, choose molding materials that are not easy to decompose.
Control mold temperature: Avoid excessive mold temperature, which can cause plastic decomposition.
Keep the mold dry: When the mold is not in use, store it in a dry environment.
Use neutral release agents: Choose release agents that do not contain acidic or alkaline substances.
Clean the mold regularly: Regularly clean the mold surface of residual materials to prevent rust.
Here are some specific treatment methods:
Light rust: For lightly rusted molds, wipe the rusted area with a soft cloth and then apply rust-preventive oil.
Moderate rust: For moderately rusted molds, sand the rusted area with sandpaper and then apply rust-preventive oil.
Severe rust: Severely rusted molds require professional treatment, such as electroplating or painting.
