1. The Bottom Molding Is Not Full (concave feet)
Symptom:
The bottom profile of the petals is not ideal, especially the bottom corners are recessed. Although the bottom forming is not full, it has little effect on filling, but it affects the stability of the bottle.
Factor:
1. Caused by insufficient high-pressure gas.
2. The temperature of the area where the bottom corner is located is not enough.
3. The high pressure blowing time is too short (pre-blowing time is too long).
4. The pre-blowing air intake is too late.
5. The exhaust hole of the bottom mold is blocked.
Solution:
1. Check whether the high-pressure intake air is above 28BAR.
2. Check whether the high pressure filter on the side of the mold is unblocked.
3. Check the working conditions of each valve to ensure the accurate positioning of the stretching during pre-blowing and high-pressure forming.
4. Check the pre-blowing and high-pressure blowing control components to ensure the correct setting and the interior is unobstructed.
5. Ensure that the pre-blowing is not too late and the time cannot be too long. Otherwise, the high pressure blowing time is too short, and the effective cooling time of the bottle in the mold is not enough.
6. Ensure that the vent holes in the bottom mold are unobstructed.
7. Increase the heating percentage of the area where the bottom corner is located or increase the number of lamps to increase the temperature in the area.
8. According to the actual situation of the bottle (bottle partition weight, thickness). Decrease the temperature in the thinner areas to distribute the material from the bottom corners to these areas.
2. Bottle Neck Expansion (Thread Expansion)
Symptom:
The threaded area swells and it conducts from the mouth to the air trap, which is more severe in hot weather. Due to the high temperature, it occurs when the bottle is blowing, and the popping sound when the high-pressure air leaks can be heard.
Factor:
1. The temperature of the furnace cooling water is too high.
2. The flow rate of the furnace cooling water is not enough.
3. The position of the furnace cooling plate is incorrect.
4, the furnace ventilation is not good.
5. The height of the furnace lamp tube frame is not well adjusted.
6. The temperature in the first area is too high.
Solution:
1. Check the temperature and flow of the cooling water in the furnace.
2. Adjust the position of the cooling plate so that it can protect the threaded area of the bottle mouth. (Let the cooling plate be 1.5mm away from the front and rear of the preform, and 2mm above the plane of the preform support ring.
3. The furnace blowing and exhausting 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. Increase the heating percentage of the lower zone or reduce the number of lamps.
5. The cooling plate design is unreasonable.
3. Neck bending
Symptom:
Usually the neck is tilted, bent to one side. The convex ring under the thread of the bottle mouth is deformed and is not perpendicular to the center of the bottle body. Such bottles severely affect filling and capping.
Factor:
1. Caused by mechanical reasons.
2. The mold temperature is too high.
3. The mold flow is not enough.
4. The temperature on both sides of the mold is inconsistent.
5. The material on the neck of the bottle is too thick.
Solution:
1. The convex ring is clamped too tightly in the recess of the top plate of the mold. The size of the preform must be fixed when it is still hot, and it needs to have a gap of 0.25mm.
2. Check the flow rate of the mold body (insufficient flow rate causes the temperature to increase) and temperature (cooling water temperature or mold temperature machine temperature). The flow rate on both sides of the mold body is inconsistent, resulting in different temperatures on both sides. If the temperature is different or too high, when the bottle is shaped after being out of the mold, the neck will be crooked due to the different amount of shrinkage.
3. The mouthpiece and the mold are not aligned.
4. The material on the neck of the bottle is too thick, increase the temperature of the area (increase the heating percentage in the area or increase the number of lamps).
4. The Bottom Line is Blue
Symptom:
Pearlescent streaks along the bottom cut line, the area of the secondary bottle with pearlescent streaks is thinner than the area of the good bottle.
Factor:
1. The pre-blowing pressure is too high.
2. The extension is too slow.
3. The pre-blowing air intake is too early.
Solution:
1. In pre-blowing, the bottle is blown up too quickly (this is often the fault of the pre-blowing solenoid valve, and high-pressure air leaks in during pre-blowing).
2. Excessive pre-blowing pressure
3. The control pressure of the extension cylinder is insufficient, the solenoid valve is dirty, the sealing ring of the control valve is worn or the coil reel is broken to cause air leakage.
4. There is resistance to the mechanical movement of the extension (the seal of the extension cylinder is worn or too dirty, the extension guide rail is not installed correctly or the linear bearing is worn).
5. The exhaust of the extended cylinder is blocked (the exhaust muffler is blocked or the air path is not smooth).
6. Adjust the pre-blow air intake angle.
5. Bottom Damage
Symptom:
There is often a small section of fine cracks where the bottom material is too thick, and it always passes through or is close to the pouring point.
Factor:
1. Mechanical reasons.
2. The temperature at the bottom of the preform is not enough (especially the bottle shape with the flat bottom of the mold).
Solution:
1. Check the gap between the stretching rod and the bottom of the mold (the gap is: 2/3 of the thickness of the bottom of the preform used)
2. Check the extension buffer.
3. Increase the heating percentage of the area where the bottom is located, and increase the number of lamps in the area (the temperature at the bottom of the preform is low. When stretching, the stretching rod runs against it toward the bottom, and cracks form at the bottom. But the bottom temperature cannot Too high, too high and convex bottom).
