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YOSION Machinery Committed to stable performance automatic pet bottle blowing machine production line since 1990s

Common faults and troubleshooting methods of blow molding machines

by:Yosion Machinery     2022-08-08
Common faults and troubleshooting methods of bottle blowing machines Fault 1: Poor transparency of PET bottles Reasons: 1. Heating temperature is too high 2. Heating time is too long 3. Compressed air contains moisture 4. The injection molding embryo tube itself is opaque 5. The embryo tube design Discomfort 6. The inflation ratio is too small. Elimination 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 improve the dryness of the raw material 5. Improve the design of the embryo tube size 6. Failure to reduce the diameter of the embryo tube 2: The PET bottle appears pearly whitening 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 penetration are insufficient. Remedy: 1. Heat up or put Slow revolution speed 2. Improve the quality of the embryo tube 3. Reduce the thickness of the embryo tube, or try to raise the outer cover of the heating device to increase the temperature of the embryo tube surface. Failure 3: The position of the water port at the bottom of the PET bottle is offset Reasons: 1. Time to start blowing Too early 2. The stretching rod did not go down to the bottom 3. The centerline of the stretching rod and the bottle shaft was offset 4. The wall thickness of the embryo tube was uneven or the injection density was uneven. Increase the descending speed of the stretch rod 2, adjust the position of the magnetic pole switch 3, adjust the position of the stretch rod 4, improve the quality of the embryo tube 5, improve the heating conditions, or check whether there is a problem with the rotation of the embryo tube. Fault 4: Reasons for uneven wall thickness of PET bottles : 1. The position of the stretching rod is not in the center of the embryo tube. 2. The blow holes are asymmetrical, and the diameter of the hole is different. 3. The stretching ratio is too low or the inflation ratio is too small. 4. The embryo tube does not rotate in the heating furnace. 5. The wall thickness of the embryo tube Uneven or uneven injection density elimination methods: 1. Adjust the position of the stretching rod 2. Adjust the position and diameter of the blowing hole 3. Increase the stretching ratio or inflation ratio 4. Check the rotation device 5. Improve the quality of the embryo tube. Fault 5: The upper part of the bottle is too thick: 1. The temperature of the upper part is too low. 2. The position of the mold exhaust hole is too far from the upper part. 3. The stretching ratio is too low. 4. The inflation ratio of the upper part of the bottle is too low. 5. The speed of the stretching rod is too slow. 1. Heat the upper part 2. Adjust the position of the vent hole 3. Increase the stretching ratio 4. Change the shape of the bottle 5 . Adjusting the stretching rod speed failure 6: The bottom of the bottle is too thin Reasons: 1. The time to start blowing is too early 2. The temperature of the bottom is too high 3. The bottom of the embryo tube is too thin Remedy: 1. Delay the start of the blowing time 2. Reduce the bottom temperature 3. Failure to increase the thickness of the bottom of the embryo tube 7: The obvious reasons for the clamping line of the bottle: 1. The clamping pressure is not enough 2. The sealing time is too early 3. The mold problem 4. The size of the tooth opening of the embryo tube does not match the mold. Remedy: 1. Increase Clamping pressure, adjust the angle of clamping strut (<5 degrees) 2. Move the mold closing travel switch position backward 3. Repair the mold or check the mold assembly position, such as whether the guide post is loose, or whether the mold is not pressed tightly Reasons for rolling up and material accumulation: 1. Delayed air blowing time is too long. 2. One roll is good. 3. The temperature at the accumulation site is too low. Shorten the delayed blowing time or reduce the descending speed of the stretching rod 2. Reduce the air volume on one side of the bottle 3. Increase the heating temperature of the embryo tube 4. Add an air storage tank to the action air source, or shorten the air supply pipeline failure 9: Reasons for stretching and perforating the bottom of the bottle: 1. Insufficient temperature and no penetration 2. Delayed stretching time is too long 3. The stretching ratio is too large 4. The bottom of the embryo tube is too thin 5. The stretching rod head is too sharp. : 1. Warming 2. Shortening the delayed stretching time 3. Reducing the stretching ratio 4. Improving the bottom design of the embryo tube 5. Rounding the stretching rod head failure 10: The bottom of the bottle is blasted Reasons: 1. The delayed air blowing time is too long Short 2. Delayed mold opening time is too short. 3. Temperature is too high. Cool down 4. Use gasoline to clean the exhaust valve failure 11: The bottom of the bottle is not full Reasons: 1. The temperature of the bottom of the bottle is too high 2. The exhaust hole at the bottom of the mold bottle is insufficient or uneven 3. The stretching rod does not reach the bottom 4. Stretching The design of the club head does not conform to the shape of the bottom of the embryo tube5, the blowing pressure is insufficient 6, the flow rate of the blowing valve is insufficient 7, the bottle bottom curve design is not good Remedy: 1. Lower the temperature at the bottom of the heating zone or use a damp cloth to reduce the temperature at the bottom of the embryo tube 2. Increase the number of vent holes and make them evenly distributed 3. Adjust the stretching rod to the bottom of the bottle 4. Replace the stretching rod head 5. Increase the blowing pressure 6. Clean the blowing valve with gasoline 7. Increase the streamlined design of the bottle bottom curve 12 : Reason: 1. If it is in a certain position relative to the teeth of the germ tube, it is the reason for the uneven thickness of the germ tube. 2. If it is in a certain position relative to the mold clamping line, it is a problem of mold exhaust. 3. The heating of the germ tube Uneven 4. Poor mold bottom design Elimination methods: 1. Improve the thickness of the embryo tube 2. Improve the exhaust hole at the bottom of the mold 3. Improve the heating conditions 4. Improve the bottom design
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