Fault 1: PET bottle transparency is not good
Reason:
- The heating temperature is too high
- Heating time is too long
- Compressed air contains water
- The injection embryo tube itself is opaque
- The embryo tube design is not suitable
- The inflation ratio is too small
Elimination Method:
- Cooldown
- Shorten the heating time
- Use a dryer to remove water
- Improve the quality of Blow Molding Machineembryo tube, select materials, and increase the dryness of raw materials
- Improve the design of embryo tube size
- Reduce the diameter of the embryo tube
Trouble 2: The PET bottle appears pearly luster and white
Reason:
- The heating temperature is too low
- Uneven wall thickness of embryo tube
- The embryo tube is too thick, and the heating and penetration are insufficient
Elimination Method:
- Heat up or slow down the revolution speed
- Improve embryo tube quality
- 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
Fault 3: The position of the bottom nozzle of the PET bottle is offset
Reason:
- Start blowing too early
- The stretch rod of the Blow Molding Machine is not down to the end
- Offset between the stretching rod and the centerline of the bottle axis
- The embryo tube wall thickness is uneven or the injection density is uneven
- Uneven heating
Elimination Method:
- Delay the blowing time or increase the descending speed of the stretching rod
- Adjust the position of the magnetic pole switch
- Adjust the position of the stretch rod
- Improve embryo tube quality
- Improve the heating conditions, or check whether there is any problem with the rotation of the embryo tube
Fault 4: uneven wall thickness of PET bottles
Reason:
- The position of the stretching rod is not in the center of the embryo tube
- The blowing holes are asymmetrical and the hole diameters are different
- The stretching ratio is too low or the expansion ratio is too small
- The embryo tube does not rotate in the heating furnace
- Uneven embryonic tube wall thickness or uneven injection density
Elimination Method:
- Adjust the position of the stretch rod of the Blow Molding Machine
- Adjust the position and diameter of the blowing hole
- Increase the stretching ratio or inflation ratio
- Check the rotation device
- Improve embryo tube quality
Fault 5: The upper part of the bottle is too thick
Reason:
- The upper temperature is too low
- The position of the mold vent hole is too far from the upper part
- The stretching ratio is too low
- The inflation ratio of the upper part of the bottle is too low
- The stretching rod speed is too slow
Elimination Method:
- The upper part is heated
- Adjust the position of the vent
- Increase the stretching ratio
- Change the shape of the bottle
- Adjust the speed of the stretch rod
Fault 6: The bottom of the bottle is too thin
Reason:
- Start blowing too early
- The bottom temperature is too high
- The bottom of the embryo tube is too thin
Elimination Method:
- Delay the start of blowing time
- Lower the bottom temperature
- Increase the thickness of the bottom of the embryo tube
Fault 7: The bottle clamping line is obvious
Reason:
- Insufficient clamping pressure
- The sealing time is too early
- Mold problem
- The size of the germ tube tooth mouth does not match the mold
Elimination Method:
- Increase the clamping pressure and adjust the angle of the clamping support rod (<5 degrees)
- Move back the position of the mold clamping stroke switch
- Repair the mold or check the assembly position of the mold, such as whether the guidepost is loose, or whether the mold is not tightly pressed
- Repair the matching position of the mold teeth
Fault 8: The bottom of the bottle or the bottleneck is rolled up and material is accumulated
Reason:
- The delayed blowing time is too long
- One roll, one good
- The temperature at the material accumulation is too low
- The air pressure for the action is unstable, which affects the descending speed of the stretching rod
Elimination Method:
- Shorten the delayed blowing time or reduce the descending speed of the stretching rod
- Lower the gas volume on one side of the reel bottle
- Increase the heating temperature of the embryo tube
- Add a gas storage tank to the action gas source, or shorten the gas supply pipeline
Fault 9: Stretching perforation at the bottom of the bottle
Reason:
- Insufficient temperature and no penetration
- Delay stretching time is too long
- The stretch ratio is too large
- The bottom of the embryo tube is too thin
- The stretched head is too sharp
Elimination Method:
- Warm-up
- Shorten the delay stretching time
- Reduce the stretch ratio
- Improve the bottom design of the embryo tube
- Trimming and stretching the head
Fault 10: Bottom blasting
Reason:
- The delayed blowing time is too short
- The delayed mold opening time is too short
- The temperature is too high
- Blow Molding Machine exhaust valve does not work
Elimination Method:
- Lengthen the delay blowing time or increase the descending speed of the stretching rod
- Lengthen the delayed opening time
- Cooldown
- Clean the exhaust valve with gasoline
Fault 11: The bottom of the bottle is not full
Reason:
- The bottom temperature of the bottle is too high
- Insufficient or uneven vent holes at the bottom of the molded bottle
- The stretch rod has not reached the bottom
- The design of the stretched head does not conform to the shape of the bottom of the embryo tube
- Insufficient blowing pressure
- Insufficient flow of blowing valve
- Poor design of the bottom curve of the bottle
Elimination Method:
- Reduce 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
- Increase the number of vent holes and make them evenly distributed
- Adjust the stretch rod to the bottom of the bottle
- Replace the stretch head
- Increase blowing pressure
- Clean the blow valve with gasoline
- Increase the curve and streamline the design of the bottom of the bottle
Fault 12: Thickness of embryo tube
Reason:
- 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
- If the mold clamping line is in a certain position relative to the mold, it is a mold exhaust problem
- Uneven heating of embryo tube
- Poor design at the bottom of the mold
Elimination Method:
- Improve the design of embryo tube thickness
- Improve the vent at the bottom of the mold
- Improve heating conditions
- Improve bottom design
Fault 13: No power indication for the bottle blowing machine
Reason:
- No power to the socket
- The insurance tube is broken
- Blow Molding Machine thread ends fall off
- The safety emergency switch is not turned on
- Whether the power switch is turned on and set to ON
- The indicator light is damaged
- Whether the miniature circuit breaker of the control socket in the heating furnace is closed
Elimination Method:
- Check whether the socket has electricity and whether the leakage switch has tripped
- Check whether the circuit is short-circuited, and then replace the fuse
- Connect the connectors
- Open the emergency safety switch
- The power switch is on
- Replace the indicator
- Close the circuit breaker
Fault 14: No sealing and stretching action
Reason:
- The clamping stroke is not in place
- The mold clamping stroke switch is broken
- The wire falls off
- Delayed stretch time relay is damaged
- The lifting solenoid valve and the stretching solenoid valve are damaged
- Blow Molding Machine cylinder intake and exhaust throttle valves are blocked or closed
- Corresponding solenoid valve failure
- Set the delay stretch time to “0”
Elimination Method:
- Move forward the clamping block
- Replace the mold clamping limit switch
- Connect the thread
- Replace the time relay
- Replace the solenoid valve
- Check the hole position to make sure it is unblocked
- Check the relevant solenoid valve
- The delay stretch time setting cannot be less than “0”
Fault 15: The disc does not rotate
Reason:
- The fuse is broken and the disc does not rotate
- The AC contactor and thermal relay are damaged
- Motor phase loss
Elimination Method:
- Use a multimeter to block to measure the resistance of the fuse.
- Measure the voltage at both ends of the AC contact coil with a multimeter ACV250. If it is 0, then measure the voltage between the upper end of the AC contactor coil and the thermal relay (96). If it is 220V, the thermal relay is damaged or overloaded.
- Connect the phase wires
Fault 16: Alarm sounds
Reason: The main motor current is too large, and the thermal relay overload current protection is cut off
Remedy: check motor failure or adjust thermal relay overload current
Fault 17: Air switch adjustment
Reason:
- Short circuit of live wire and voltage regulating circuit
- The motor burns out
Elimination Method:
- If the switch is closed, it will trip. First, disconnect the heating air switch, and then close it. If it jumps again, it means that the main circuit is short-circuited and grounded. Close the air switch one by one. When it is closed, it will jump. There is a problem with a voltage regulating circuit of this air switch, please check one by one
- If the motor starts to trip, it means there is a problem with the motor branch circuit
Fault 18: The lamp does not light up
Reasons: 1. The voltage regulating circuit is damaged
- The lamp filament is broken
- The SCR is damaged or disconnected
- The lamp tube is disconnected
Elimination Method:
- Measure the voltage at both ends of the lamp with a multimeter ACV250 gear
- If there is 220V, the lamp filament is broken, remove it.
- If it is “0”, check the corresponding voltage regulating circuit, first measure whether there is voltage output, and then whether there is voltage input, if there is input but no output, it is generally because the SCR is damaged or the potentiometer is disconnected.
- When the potentiometer is adjusted, the indicator light changes in brightness, which can indicate that the thyristor is intact, and it is concluded that the lamp tube is broken
Fault 19: The stretch rod fails to rise and return to the original position after the mold is opened
Reason:
- The position of the magnetic pole switch is too low, and the piston of the cylinder does not pass the magnetic pole switch after the stretch rod reaches the bottom of the stretch position.
- The stretching speed of the stretching rod is too fast.
Elimination Method:
- First manually raise the stretch rod to its original position, and then adjust the magnetic pole switch to a higher position to ensure that the magnetic pole switch can sense the piston when the stretch rod reaches the bottom of the position.
- Tighten the screw of the one-way throttle valve joint under the stretching cylinder clockwise to reduce the falling speed of the stretch rod of the Blow Molding Machine. Note that changing the speed of the stretch rod may affect the blowing effect, which may be appropriate. Adjust the time setting of “Delayed Blowing” and make the match to achieve the ideal effect of blowing when the stretch rod reaches the bottom of the bottle.