1, high temperature oil spray non-stick coating. Sandwich machine materials generally use high-temperature oil-sprayed non-stick coating, which is a special functional coating that is not easy to be adhered by other sticky substances or easily removed after being adhered. This functional coating is characterized by high temperature resistance, extremely low surface energy, small friction coefficient, easy sliding and strong repulsion. Generally, it is composed of pure inorganic materials, does not contain any organic materials, has no volatilization, has good safety, little environmental pollution, high melting temperature, strong repulsion under high-temperature melting, high thermal expansion coefficient, good thermal stability, high thermal conductivity and high strength.

2, stainless steel material. Stainless acid-resistant steel is called stainless steel for short, which is composed of stainless steel and acid-resistant steel. In short, the steel that can resist atmospheric corrosion is called stainless steel, while the steel that can resist chemical medium corrosion is called acid-resistant steel. Generally speaking, steel with Cr content greater than 12% has the characteristics of stainless steel. According to the microstructure after heat treatment, stainless steel can be divided into five categories: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic-ferritic duplex stainless steel and precipitation hardening stainless steel.