Common faults and troubleshooting methods of blow molding
machine Fault 1: PET bottle transparency reasons: 1. Heating temperature is too high 2. Heating time is too long 3. Compressed air contains water 4. Injection embryo tube itself is opaque 5. Embryo tube design Discomfort 6. The expansion ratio is too small. Elimination methods: 1. Cool down 2. Reduce heating time 3. Use a dryer to remove water 4. Improve embryo tube quality, select materials and increase raw material dryness 5. Improve embryo tube size design 6. Diameter reduction of embryo tube 2: Causes of pearl luster and whitening in PET bottles: 1. Heating temperature is too low 2. Embryo tube wall thickness is uneven 3. Embryo tube thickness is too thick, insufficient heating and penetration Slow revolution speed 2. Improve embryo tube quality 3. Reduce embryo tube thickness, or try to increase the outer cover of heating device to increase the surface temperature of embryo tube. Trouble 3: PET bottle bottom nozzle position offset Reason: 1. Start blowing time Too early 2. The stretch rod is not down to the end 3. The stretch rod is offset from the center line of the bottle axis 4. The embryo tube wall thickness is uneven or the injection density is uneven 5. The heating is uneven. Elimination method: 1. Delay the blowing time or 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 the embryo tube rotates for problems. Trouble 4: The cause of uneven wall thickness of the PET bottle :1. The position of the stretch rod is not in the center of the embryo tube. 2. The blow holes are asymmetrical and the pore size 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 embryo tube wall thickness Uneven or uneven injection density troubleshooting methods: 1. Adjust the position of the stretch rod 2. Adjust the position and aperture 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. 5: Reasons for the upper part of the bottle being too thick: 1. The upper part temperature is too low 2. The position of the mold vent hole is too far away 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. 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. Fault 6: The bottom of the bottle is too thin. Reasons: 1. The blowing time is too early. 2. The bottom temperature is too high. 3. The bottom of the embryo tube is too thin. Solution: 1. Delay the blowing time. 2. Lower the bottom temperature. 3. Increasing the bottom thickness of the embryo tube. Fault 7: obvious reasons for the bottle clamping line: 1. The clamping pressure is not enough. 2. The sealing time is too early. 3. The mold problem. 4. The size of the embryo tube tooth mouth does not match the mold. Solution: 1. Increase Clamping pressure, adjust the angle of clamping struts (<5 degrees) 2. Move back the mold clamping stroke switch position 3. Repair the mold or check the mold assembly position, such as whether the guide post is loose or whether the mold is not tightly pressed 4. Repair mold tooth mouth fitting fault 8: The bottom of the bottle or bottleneck is rolled up, and the cause of material accumulation: 1. The delayed blowing time is too long 2. One roll is good 3. The temperature at the accumulation place is too low 4. The air pressure for action is unstable , The method of affecting the descending speed of the stretch rod: 1. Shorten the delayed blowing time or reduce the descending speed of the stretch rod. 2. Reduce the air volume on one side of the reel. 3. Increase the heating temperature of the embryo tube. 4. Add air storage. The tank is in the action air source, or the air supply pipeline is shortened. 9: The bottom of the bottle is stretched and perforated. Reasons: 1. The temperature is not enough and not penetrated. 2. The delay stretch time is too long. Too thin 5. Too sharp stretched head troubleshooting method: 1. Heat 2. Shorten the delay stretch time 3. Reduce the stretch ratio 4. Improve the bottom design of the embryo tube 5. Round the stretched head failure 10: Bottle Reasons for bottom blasting: 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 Remedy: 1. Extend the delayed blowing time or increase the stretch rod Decrease speed 2. Lengthen the delay opening time 3. Cool down 4. Clean the exhaust valve with gasoline. Fault 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 is insufficient or uneven 3. The stretch rod has not reached the bottom 4. The design of the stretch rod head does not conform to the shape of the bottom of the embryo tube 5. The blowing pressure is insufficient 6. The blowing valve flow is insufficient 7. The bottle bottom curve design is not good. Lower the bottom temperature or use a damp cloth to reduce the temperature at the bottom of the embryo tube 2. Increase the number of vents 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 pressure 6. Clean and blow with gasoline Air valve 7. Add the curved streamline design of the bottle bottom. Fault 12: Reasons: 1. If the tooth part of the embryo tube is in a specific position, it is the reason for the uneven thickness of the embryo tube. 2. If the mold clamping line is in a specific position relative to the mold The orientation is due to the problem of mold exhaust. 3. The embryo tube is heated unevenly. 4. The bottom of the mold is poorly designed. Elimination methods: 1. Improve the thickness of the embryo tube. 2. Improve the vent at the bottom of the mold. 3. Improve the heating conditions. 4. Improve the bottom design.
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