The surface treatment methods of rotomolding mould

The surface treatment of rotomolding molds can be mainly classified into two categories: enhancing functionality and optimizing the appearance texture. Including the following types:

1. Chemical treatment

l Through processes such as pickling and phosphating, the oxide layer and oil stains on the mold surface are removed, enhancing the adhesion of subsequent coatings. This is the basic pre-treatment step.

2. Coating treatment:

l Apply Teflon (PTFE) or other non-stick coatings to reduce the adhesion between the plastic and the mold, enabling quick demolding. This is particularly suitable for materials with high viscosity.

l Apply hard chrome or nickel-phosphorus alloy coating to enhance the hardness and wear resistance of the mold surface, extend its service life, and simultaneously improve its corrosion resistance.

3. Physical texture processing:

l Through sandblasting and etching processes, uniform matte, fine sand or specific patterns are created on the mold surface, enabling the finished product to exhibit three-dimensional textures such as wood grain or stone texture.

l The mirror-like effect is achieved through polishing technology, making the surface of the finished product smooth and transparent. It is suitable for products with high requirements for external cleanliness.

4. Special function processing：

l Apply anti-ultraviolet coating treatment to reduce the aging of the mold under long-term high-temperature heating, and at the same time, this can indirectly enhance the UV resistance of the finished product.