1. When the glass billet falls into the initial mold, it cannot accurately enter the initial mold, and the friction with the mold wall is too large to form wrinkles. After positive blowing, the wrinkles spread and enlarge, forming wrinkles in the glass bottle body.

2. The cutting marks of the upper feeding machine are too large, and the cutting scars of some glass bottles appear on the bottle body after forming.

3. The material of the initial mold and the forming mold of the glass bottle is poor, the density is not enough, the oxidation is too fast after high temperature, and small concave points are formed on the surface of the mold, resulting in the surface of the glass bottle after forming.

4. The poor quality of oil in the glass bottle mold will make the mold not lubricated enough, the dropping speed of lubricating oil will be reduced, and the material type will change too fast.

5. The initial mold design is not reasonable, the mold cavity is large or small, the material drops into the molding mold, the positive blowing diffusion is not uniform, will make the glass bottle body spots 6 the machine dropping speed is not uniform, the air nozzle improper adjustment will make the glass bottle initial mold and mold temperature is not coordinated, easy to create cold spots in the glass bottle body, directly affect the finish.

7. The glass liquid in the kiln is not clean or the material temperature is not uniform, which will also cause bubbles, small particles and small hemp billet in the glass bottles produced.

8. If the machine speed is too fast or slow, there will be uneven glass bottle body, different thickness of bottle wall, resulting in spots.