How to Solve Common Problems of PET bottle blowing machine

October 12, 2022

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. Adjust the position and aperture of blowing hole

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:+86 15355669963

www.bottleblow.com

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