Firstly, the transparency of the glass bottle. The transparency of glass bottles can give customers a clean visual impression. The hardness and quality of glass bottles can enhance customer confidence. Many manufacturers improve the quality of glass containers through cold and hot spraying, as well as the inner and outer walls of glass bottles.

Another method to increase the hardness of the container by adding powder during wall heating is to reduce cracks on the surface and inside of the glass bottle, thereby increasing the hardness of the glass bottle and improving product quality. The specific principle of this powder spraying method is: when the glass bottle comes out of the molding mold of the bottle making machine, multiple particles of ammonium sulfate powder are placed into the bottle through an automatic powder spraying machine, and then annealed in an annealing kiln.