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Principle and maintenance of plastic bag sealing machine and common faults and troubleshooting methods
Add Time：2022-02-22 07:01:59
The plastic bag sealing machine is composed of a frame, a deceleration and speed regulation transmission mechanism, a heating and cooling mechanism, a sealing and printing mechanism, a conveying device and an electrical and electronic control system. When the power is turned on, each mechanism starts to work, and the electric heating element is heated after being energized, so that the upper and lower heating blocks heat up sharply and are adjusted to the required temperature through the control system; the embossing wheel rotates; Adjusted to the desired speed by the speed control device. When the package containing the articles is placed on the conveyor belt, the sealing part of the bag is automatically sent to the two sealing belts in operation and brought into the heating zone, and the heat of the heating block is transmitted to the sealing part of the bag through the sealing belt, so that the The film is heated and melted and softened, and then passes through the cooling zone to make the surface temperature of the film drop appropriately, and then is rolled by a knurling wheel (or printing wheel) to bond the upper and lower plastic films of the sealing part and press out a mesh pattern (or printed logo). ), and then the sealed packaging bag is sent out of the machine by the guiding rubber belt and the conveyor belt to complete the sealing operation.
With the development of the times, most of the production has been replaced by machines. The application of vacuum sealing machine for plastic bags is relatively wide; the vacuum sealing machine for plastic bags is a kind of sealing equipment with less investment, high cost performance, simple operation and high efficiency. . The following are the common faults and troubleshooting methods of plastic bag vacuum sealing machine in production.
Plastic bag sealing machine maintenance | Common faults and troubleshooting methods
Plastic bag vacuum sealing machine fault one:
Fault phenomenon: The sealing belt is deviated.
Cause: The sealing tape is adjusted too loosely. The adjusting screw is incorrect.
Remedy: Adjust the tensioner and do not over-tighten it. Please adjust the adjusting screw carefully.
Plastic bag vacuum sealing machine fault two:
Fault phenomenon: The conveyor belt is deviated.
Reason: The adjustment button of the conveyor belt is not adjusted properly.
Remedy: to the left, tighten the left knob, loosen the right knob, and vice versa (fine adjustment).
Plastic bag vacuum sealing machine fault three:
Fault phenomenon: the seal is not firm.
Reason: The temperature is too low and the speed is too fast.
Remedy: heat up and slow down appropriately.
Plastic bag vacuum sealing machine fault four:
Fault phenomenon: the printing is not clear.
Reason: The printing pressure adjustment speed is too fast.
Remedy: Press the pressure button.
Plastic bag vacuum sealing machine fault five:
Fault phenomenon: the seal is wrinkled and sticky.
Reason: The temperature is too high, and the 0-type belt is not conveyed properly.
Remedy: turn on the fan, reduce the speed or cool down, open the left panel, and adjust the distance between the guide wheel and shaft.
Plastic bag vacuum sealing machine fault six:
Fault phenomenon: no heating (or no temperature control).
Reason: heating switch beaker, electric heating tube burnt out, temperature control table failure, electric thermocouple failure.
Remedy: change the toggle switch, fill the electric heating tube, remove the instrument and send it to the manufacturer for repair, and replace the electric thermocouple.
Plastic bag vacuum sealing machine failure seven:
Fault phenomenon: the conveying table does not turn.
Reason: The rotating shaft is degummed and the top wire of the bridge gear is loose.
Remedy: remove the rotating shaft and glue it with 502 all-purpose glue, remove the left side plate and fasten the m5 screw.
Plastic bag vacuum sealing machine fault eight:
Fault phenomenon: The noise of the worm gear box is too loud.
Reason: The worm gear box leaks oil.
Remedy: Remove the screw box, open the upper cover, the worm gear shaft, and the left cover of the worm, replace the oil-protecting rubber ring, and then add butter to fix the cover and install the machine.
Plastic bag vacuum sealing machine failure nine:
Fault phenomenon: The fuse is burnt out.
Reason: A switch is short-circuited, the electric heating tube is short-circuited, and the circuit board is short-circuited.
Remedy: use a multimeter to check each switch and replace it, open the back cover and check the electric heating pipe joint and replace it, unplug the circuit board and check and replace the original.
Plastic bag vacuum sealing machine failure ten:
Fault phenomenon: there is induction or leakage.
Reason: ungrounded electric heating tube leakage.
Remedy: connect the three-plug ground wire and replace the electric heating tube.
What should I do if the plastic bag sealing machine does not seal tightly?
(1) The heat sealing temperature of the plastic bag sealing machine is not enough.
Under normal circumstances, when the composite bag with OPP as the lining material, when the total thickness of the bag is 80-90 μm, the heat sealing temperature should reach 170-180 ℃; the total thickness of the composite bag with PE as the lining material is 85-100 μm At this time, the temperature should be controlled at 180 ~ 200 ℃. As long as the overall thickness of the bag is increased, the heat sealing temperature must be increased accordingly.
(2) The heat sealing speed of the plastic bag sealing machine is too fast.
The inability to seal the mouth is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported by the traction roller to the cold pressing place for cooling treatment before it can be heated, which will naturally fail to meet the requirements of heat sealing quality.
(3) The pressure of the cold-pressing rubber wheel of the plastic bag sealing machine is not suitable.
There are two cold-pressed rubber wheels on the top and bottom, and the pressure between them should be moderate. When adjusting the pressure, you only need to clamp the spring.
(4) There is a problem with the quality of the heat-sealing film of the plastic bag sealing machine.
The failure to seal the seal is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it happens to appear at the seal, and it will definitely not be able to seal. This situation is rare, but when it occurs, the product is bound to be scrapped. Therefore, in the color printing and packaging industry, the next process supervises the previous process. Once a quality problem is found, the cause must be analyzed and solved in time. If there is moisture or dirt on the seal, it will also cause the seal to be weak.
With the development of the times, most of the production has been replaced by machines. The application of vacuum sealing machine for plastic bags is relatively wide; the vacuum sealing machine for plastic bags is a kind of sealing equipment with less investment, high cost performance, simple operation and high efficiency. . The following are the common faults and troubleshooting methods of plastic bag vacuum sealing machine in production.
Plastic bag sealing machine maintenance | Common faults and troubleshooting methods
Plastic bag vacuum sealing machine fault one:
Fault phenomenon: The sealing belt is deviated.
Cause: The sealing tape is adjusted too loosely. The adjusting screw is incorrect.
Remedy: Adjust the tensioner and do not over-tighten it. Please adjust the adjusting screw carefully.
Plastic bag vacuum sealing machine fault two:
Fault phenomenon: The conveyor belt is deviated.
Reason: The adjustment button of the conveyor belt is not adjusted properly.
Remedy: to the left, tighten the left knob, loosen the right knob, and vice versa (fine adjustment).
Plastic bag vacuum sealing machine fault three:
Fault phenomenon: the seal is not firm.
Reason: The temperature is too low and the speed is too fast.
Remedy: heat up and slow down appropriately.
Plastic bag vacuum sealing machine fault four:
Fault phenomenon: the printing is not clear.
Reason: The printing pressure adjustment speed is too fast.
Remedy: Press the pressure button.
Plastic bag vacuum sealing machine fault five:
Fault phenomenon: the seal is wrinkled and sticky.
Reason: The temperature is too high, and the 0-type belt is not conveyed properly.
Remedy: turn on the fan, reduce the speed or cool down, open the left panel, and adjust the distance between the guide wheel and shaft.
Plastic bag vacuum sealing machine fault six:
Fault phenomenon: no heating (or no temperature control).
Reason: heating switch beaker, electric heating tube burnt out, temperature control table failure, electric thermocouple failure.
Remedy: change the toggle switch, fill the electric heating tube, remove the instrument and send it to the manufacturer for repair, and replace the electric thermocouple.
Plastic bag vacuum sealing machine failure seven:
Fault phenomenon: the conveying table does not turn.
Reason: The rotating shaft is degummed and the top wire of the bridge gear is loose.
Remedy: remove the rotating shaft and glue it with 502 all-purpose glue, remove the left side plate and fasten the m5 screw.
Plastic bag vacuum sealing machine fault eight:
Fault phenomenon: The noise of the worm gear box is too loud.
Reason: The worm gear box leaks oil.
Remedy: Remove the screw box, open the upper cover, the worm gear shaft, and the left cover of the worm, replace the oil-protecting rubber ring, and then add butter to fix the cover and install the machine.
Plastic bag vacuum sealing machine failure nine:
Fault phenomenon: The fuse is burnt out.
Reason: A switch is short-circuited, the electric heating tube is short-circuited, and the circuit board is short-circuited.
Remedy: use a multimeter to check each switch and replace it, open the back cover and check the electric heating pipe joint and replace it, unplug the circuit board and check and replace the original.
Plastic bag vacuum sealing machine failure ten:
Fault phenomenon: there is induction or leakage.
Reason: ungrounded electric heating tube leakage.
Remedy: connect the three-plug ground wire and replace the electric heating tube.
What should I do if the plastic bag sealing machine does not seal tightly?
(1) The heat sealing temperature of the plastic bag sealing machine is not enough.
Under normal circumstances, when the composite bag with OPP as the lining material, when the total thickness of the bag is 80-90 μm, the heat sealing temperature should reach 170-180 ℃; the total thickness of the composite bag with PE as the lining material is 85-100 μm At this time, the temperature should be controlled at 180 ~ 200 ℃. As long as the overall thickness of the bag is increased, the heat sealing temperature must be increased accordingly.
(2) The heat sealing speed of the plastic bag sealing machine is too fast.
The inability to seal the mouth is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported by the traction roller to the cold pressing place for cooling treatment before it can be heated, which will naturally fail to meet the requirements of heat sealing quality.
(3) The pressure of the cold-pressing rubber wheel of the plastic bag sealing machine is not suitable.
There are two cold-pressed rubber wheels on the top and bottom, and the pressure between them should be moderate. When adjusting the pressure, you only need to clamp the spring.
(4) There is a problem with the quality of the heat-sealing film of the plastic bag sealing machine.
The failure to seal the seal is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it happens to appear at the seal, and it will definitely not be able to seal. This situation is rare, but when it occurs, the product is bound to be scrapped. Therefore, in the color printing and packaging industry, the next process supervises the previous process. Once a quality problem is found, the cause must be analyzed and solved in time. If there is moisture or dirt on the seal, it will also cause the seal to be weak.