Application of PVD Coatings in Injection Mold Processing
PVD (Physical Vapor Deposition) is a surface treatment technology widely used in injection mold processing. By depositing a high-hardness, low-friction, and highly wear-resistant coating on the mold surface, PVD technology enhances the performance and service life of molds.
Functions and Advantages of PVD Coatings
1. Enhancing Mold Surface Hardness
PVD coatings are typically composed of materials such as titanium nitride (TiN), chromium nitride (CrN), and titanium aluminum nitride (TiAlN). These materials exhibit extremely high hardness, significantly improving the wear resistance of molds and extending their lifespan.
2. Reducing Friction and Wear
The smooth surface and low friction coefficient of PVD coatings help reduce wear caused by sliding and contact during the injection molding process, thereby improving production efficiency.
3. Preventing Mold Surface Corrosion
Certain plastics release corrosive gases (such as chlorine and fluorine) during the injection molding. PVD coatings form a dense protective layer on the mold surface, preventing corrosion.
4. Improving Demolding Performance
PVD coatings' low adhesion and high-temperature resistance effectively minimize the sticking of plastic products to the mold surface, thus enhancing demolding performance.
5. High-Temperature Resistance
PVD coatings exhibit excellent high-temperature resistance and maintain stable performance even in high-temperature injection molding environments. This makes them suitable for processing high-melting-point plastic materials.
Specific Application Scenarios
1. Processing High-Gloss and High-Precision Products
For products requiring high-gloss surface finishes (e.g., optical lenses, automotive interior components), PVD coatings ensure the smoothness and stability of the mold surface.
2. Injection Molding of High-Filler Materials
When processing high-filler materials containing glass fibers or carbon fibers, these materials can cause significant wear on the mold surface. PVD coatings significantly reduce this type of wear.
3. Protecting Complex Molds
For molds with complex structures or intricate textures, PVD coatings protect the surface structure and extend the mold’s service life.
