Common trouble of PET stretch blowing machine as following:
1.Poor transparency of the PET bottle
Reason:
1. Heating temperature is too high
2. Heating time is too long
3. Compressed air contains water
4. Injection molding tube itself is opacity
5. Embryo tube design is not suitable
6. The blowing-up rate is too small
Solution:
1. cooling down
2. shorten the heating time
3. .Use dryer to remove water
4. Improving the quality of the embryonic tube,select materials and improve the drying degree of raw materials
5. Improve the size design
of embryonic tube
6. Reduced diameter of tube
2: PET bottle appears pearl luster white
Reason:
1. Heating temperature is too low
2. Embryonic tube thickness is uneven
3.Embryonic tube thickness is too deep,heating penetration is
insufficient.
Solution:
1. Heating or slow the speed of revolution
2. Improve the quality of embryonic tube
3. Reduce the thickness of embryonic tube, or try to increase outer cover of heating device in order to increase the temperature emission of the embryonic tubes'outer surface.
3.PET bottle bottom the position deviation of the nozzle
Reason:
1. Start blowing is too early
2. The stretching rod didn't stretch to the bottom
3. The center line of the stretching rod and bottle shaft offsets
4. Uneven tube thickness or injection density
5. Uneven heating
Solution:
1. Delay blowing time or increase the stretch rod dropping speed
2. Adjust the position of magnetic pole switch
3. Adjust the position of stretching rod
4. Improve the quality of embryonic tube
5. Improve the conditions of heating or check whether the rotation of the embryo tube has a problem
4.PET bottle wall thickness is uneven
Reason:
1.The position of the stretching rod is not on the center of the embryonic tube
2. Asymmetry of blow holes and different pore size
3. Stretching ratio is low or the blowing rate is too small
4.The embryonic tube does not rotate in the heating furnace
5. Uneven tube thickness or injection density
Solution:
1. Adjust the position of stretching rod
2. Điều chỉnh vị trí và khẩu độ của lỗ thổi
3. Increase the stretching ratio or blowing ratio
4. Check the rotation device
5. Improve the quality of embryo tube
5.The upper part of the bottle is too thick
Reason:
1. The temperature of the upper part is too low
2. The position of mold exhaust hole is too far from the upper
3. Stretch ratio is too low
4. The bottle blowing ratio of the upper part of is too low
5. Stretching rod speed is too slow
Solution:
1. heating the upper pa
rt
2. Adjust the position of the exhaust vent
3. Increasing the stretching ratio
4. Change the shape of bottle
5. Adjust the speed of the stretching rod
More question of PET blowing machine,welcome to contact:
whatsapp/wechat/mobile: plus 86 15298806921
www.eceng-petblowing.com
