For example, when blowing a bottle, the temperature is […]
For example, when blowing a bottle, the temperature is different. The quality of the bottle depends on the temperature of the preform and the heater, as well as the time to delay the blowing. What you said about stretching morning and night is actually the time when you delay blowing. The bottle was blown too early, and the bottom of the bottle stuttered too late.
12 common faults and cleaning methods of blow molding machine!
Problem 1: PET bottle transparency is not safe
Reasons: 1. The heating temperature is too high. 2. The heating time is too long. 3. The compressed air contains water. 4. The injection embryo tube itself is opaque. 5. The embryo tube planning is not suitable. 6. The inflation share is too small.
Cleaning methods: 1. Cool down 2. Shorten the heating time 3. Use a dryer to remove water 4. Improve the quality of the embryo tube, select materials and increase the dryness of the material 5. Improve the embryo tube size planning 6. Reduce the embryo tube diameter
Problem 2: PET bottle appears pearly luster and white
Reasons: 1. The heating temperature is too low 2. The wall thickness of the embryo tube is uneven 3. The thickness of the embryo tube is too thick, and the heating and soaking are insufficient
Cleaning methods: 1. Increase the temperature or slow down the revolution speed 2. Improve the quality of the embryo tube 3. Reduce the thickness of the embryo tube, or try to increase the outer cover of the heating device to increase the surface temperature of the embryo tube
Problem 3: The position of the nozzle at the bottom of the PET bottle is offset
Reasons: 1. The start blowing time is too early 2. The stretching rod is not down exactly 3. The center line of the stretching rod and the bottle axis is offset 4. The embryo tube wall thickness is uneven or the injection density is uneven 5. The heating is uneven
Cleaning method: 1. Delay the blowing time or add the descending speed of the stretching rod 2. Adjust the position of the magnetic pole switch 3. Adjust the position of the stretching rod 4. Improve the quality of the embryo tube 5. Improve the heating conditions, or check whether the embryo tube rotation has problems
Problem 4: uneven wall thickness of PET bottles
Reasons: 1. The orientation of the stretch rod is not in the center of the embryo tube 2. The blow holes are asymmetrical and the pore diameters are different 3. The stretching ratio is too low or the inflation share is too small 4. The embryo tube does not rotate in the heating furnace 5. The embryo tube wall Uneven thickness or uneven injection density
Cleaning method: 1. Adjust the orientation of the stretch rod 2. Adjust the orientation and aperture of the blowing hole 3. Increase the stretching ratio or the inflation share 4. Check the rotation device 5. Improve the quality of the embryo tube
Problem 5: The upper part of the bottle is too thick
Reasons: 1. The upper part temperature is too low 2. The die vent hole is too far from the upper part 3. The stretching ratio is too low 4. The upper part of the bottle expansion ratio is too low 5. The stretching rod speed is too slow
Cleaning method: 1. Heat the upper part 2. Adjust the position of the exhaust hole 3. Increase the stretching ratio 4. Change the shape of the bottle 5. Adjust the stretch rod speed
Problem 6: The bottom of the bottle is too thin
Reasons: 1. The start blowing time is too early 2. The bottom temperature is too high 3. The bottom of the embryo tube is too thin
Cleaning method: 1. Delay the start blowing time 2. Lower the bottom temperature 3. Add the bottom thickness of the embryo tube
Problem 7: The bottle clamping line is significant
Reasons: 1. The clamping pressure is not good 2. The sealing time is too early 3. The mold problem 4. The size of the germ tube tooth mouth does not match the mold cooperation
Cleaning method: 1. Increase mold clamping pressure, adjust the viewpoint of mold clamping support rod (<5 degrees) 2. Move the mold clamping stroke switch position back 3. Repair mold or check mold assembly position, if the guide post is loose, or Whether the mold is not pressed tightly 4. Repair the cooperation position of the mold mouth
Problem 8: The bottom or neck of the bottle is rolled up and material is accumulated
Reasons: 1. The delayed blowing time is too long. 2. One roll is excellent. 3. The temperature of the material accumulation is too low. 4. The pressure of the dynamic effect is unstable, which affects the descending speed of the stretching rod.
Cleaning method: 1. Shorten the delayed blowing time or reduce the descent speed of the stretching rod. 2. Reduce the air volume on one side of the reel. 3. Add the heating temperature of the embryo tube. 4. Add an air storage tank to the action air source, or Shorten the air supply line
Problem 9: Stretching and perforating the bottom of the bottle
Reasons: 1. Insufficient temperature and not soaked 2. Delay stretch time is too long 3. Stretch ratio is too large 4. The bottom of embryo tube is too thin 5. Stretching rod head is too sharp
Cleaning methods: 1. Warm up 2. Shorten the delay stretch time 3. Reduce the stretch ratio 4. Improve the plan of the bottom of the embryo tube 5. Round the stretch head
Problem 10: Explosion at the bottom of the bottle
Reasons: 1. Delayed blowing time is too short 2. Delayed mold opening time is too short 3. Temperature is too high 4. Exhaust valve does not work
Cleaning method: 1. Lengthen the delay blowing time or add the lowering speed of the stretch rod 2. Lengthen the delay opening time 3. Cool down 4. Clean the exhaust valve with gasoline
Problem 11: The bottom of the bottle is not full
Reasons: 1. The temperature of the bottom of the bottle is too high 2. The vent hole at the bottom of the mold is lacking or uneven 3. The stretch rod is not at the bottom 4. The stretch rod head does not conform to the shape of the embryo tube bottom 5. The blowing pressure is lacking 6 , The flow of the blowing valve is lacking 7, the bottom curve planning of the bottle is not safe
Cleaning method: 1. Lower the temperature at the bottom of the heating zone or use a damp cloth to lower the temperature at the bottom of the embryo tube 2. Add the number of vent holes and make it evenly distributed 3. Adjust the stretch rod to the bottom of the bottle 4. Replace the stretch rod head 5. Increase the blowing Gas pressure 6. Clean the blow valve with gasoline 7. Add a streamlined plan for the bottom curve of the bottle
Problem 12:
Reasons: 1. If the tooth part of the embryo tube is in a specific position, it is the cause of the uneven thickness of the embryo tube. 2. If the mold clamping line is in a specific position, it is a mold exhaust problem. 3. The embryo tube is not heated. Evenly 4. The bottom of the mold is poorly planned
Cleaning methods: 1. Improve the thickness planning of the embryo tube 2. Improve the vent at the bottom of the mold 3. Improve the heating conditions 4. Improve the bottom planning
