Surface Treatment of Plastic Mould
Plastic moulds are essential components in the manufacturing industry. They are used to manufacture a variety of products, ranging from toys and electronics to automotive components. In order for them to perform effectively, plastic moulds must be surface treated. Surface treatment is the process of modifying or improving the properties of the moulds surface. This is done to improve characteristics such as wear, lubricity, corrosion resistance, and aesthetics.
Surface treatment of plastic moulds is a complex process and involves a variety of techniques. Depending on the application and finishes, treatments may include shot peening or sandblasting. For further protection, some moulds may require coating with a special resin, such as epoxy or polyurethane. Other options for surface treatment include thermal spraying, electroplating, and painting.
Shot peening is a process in which steel shots are shot onto the mould surface at high speed. The shots impact and deform the surface, creating tiny pits and areas of compression that can improve the mould’s durability and resistance to wear. This method is often used to finish a mould before it is painted.
Sandblasting is the process of blasting a finely graded sand at the mould at high speed. The sand impacts and removes surface contaminants, smooths out rough patches, and creates a uniform surface finish. It can also improve the bonding properties of the surface for coatings.
Thermal spraying involves spraying a protective coating of metal or plastic onto the surface of the mould. This coating not only improves the looks and durability of the mould, but also increases its resistance to corrosion.
Electroplating is a technique used to deposit metal onto a mould’s surface to improve its appearance and durability. A variety of metals, including chrome, gold, and nickel, can be used for electroplating.
Painting is an important step in finishing a plastic mould. Generally, a two-component urethane or epoxy coating is applied over the mould’s surface. This coating not only provides a smooth and attractive finish, but also helps to protect the underlying mould surface.
Surface treatment of plastic moulds is essential for maintaining and improving the performance, durability, and appearance of the moulds. Different techniques can be used to treat the surface of a mould depending on the application and finish desired. For the best results, it is important to choose the right technique and use it properly.
