1.Chemical foaming, this method will form open cells inside the product, and the cells are relatively large. It is definitely impossible to make a product as thin as stone paper, and the stone paper should be squeezed. The calendering process is mostly, right? The extrusion process uses chemical foaming, and after coming out of the die, the gas will run out, which is not feasible.
2. Physical foaming. Expancel microspheres are available on the market. Plastic microspheres with a hollow structure will expand and become larger when heated. You can try products with low cost requirements and high specific gravity requirements. They will always remain closed. Pore structure, you can try it for extruded film products.
