Bottle Mouth Expansion (thread Expansion) Solution

Symptoms: Swelling in the threaded area, which starts at the mouth of the bottle and travels to the anti-gas groove, especially in hot weather. Due to the high temperature, it will happen when the bottle is blown, and the popping sound when the high-pressure gas leaks can be heard.

Factor:

1. The temperature of the furnace cooling water is too high;

2. The flow rate of furnace cooling water is not enough;

3. The position of the furnace cooling plate is incorrect;

4. The furnace is not well ventilated;

5. The height of the lamp tube frame of the furnace is not well adjusted;

6. The temperature in the first zone is too high.

Solution:

1. Check the temperature and flow of the furnace cooling water;

2. Adjust the position of the cooling plate so that it can protect the threaded area of the bottle mouth, so that the cooling plate is 1.5mm away from the front and back of the preform, and 2mm above the plane of the preform support ring;

3. The blowing and exhausting of the furnace can be increased to reduce the ambient temperature. Or open the side door of the heating furnace to strengthen the air convection so that the heating furnace can dissipate heat well;

4. Reduce the heating percentage of the first zone or reduce the number of lamp tubes;

5. The design of the cooling plate is unreasonable;