Maintenance Guide for A4 Paper Sheeting and Packing Machines

During the long-term operation of A4 paper sheeting and packing machines, various failures are bound to occur. Mastering effective maintenance methods is crucial for ensuring their normal operation and improving production efficiency. The following are some common failures and corresponding maintenance strategies.

I. Problems with Inaccurate Cutting
Wear of Cutting Tools
1.Failure Manifestation: The edges of the cut A4 papers are rough, uneven, or there are relatively large dimensional deviations.
2.Maintenance Methods: First, stop the machine and cut off the power supply to ensure operational safety. Then, carefully disassemble the cutting tools and use professional tool measuring tools to check the degree of wear of the tools. If the tools are only slightly worn, they can be sharpened with a whetstone or professional tool grinding equipment to restore the sharpness of the cutting edges. If the wear is severe, new tools need to be replaced. When installing new tools, it is necessary to install them strictly in accordance with the requirements of the equipment manual to ensure that the tools are installed firmly and in the correct position. After installation, test cuts should be carried out and the cutting accuracy should be measured. If there are deviations, make timely adjustments.
Incorrect Cutting Parameters
1.Failure Manifestation: The size of the cut paper does not match the preset A4 size and may be either larger or smaller.
2.Maintenance Methods: Enter the control system of the equipment and check the cutting parameter settings. Confirm whether the horizontal and vertical cutting length parameters are correctly set to 210 mm and 297 mm. If the parameters are incorrect, modify them to the correct values in a timely manner. Meanwhile, check whether there are software failures or system bugs that cause parameter loss or confusion in the equipment. If so, contact the equipment manufacturer to obtain software updates or repair patches. After installation, reset the parameters and conduct test cuts to ensure that the cutting accuracy returns to normal.

II. Abnormalities in Packaging
Poor Conveyance of Packaging Materials
1.Failure Manifestation: Packaging materials (such as plastic films or paper wrapping papers) experience jams, tears, or are unable to be fed normally during the conveying process.
2.Maintenance Methods: Check whether the reels of the packaging materials are installed correctly and whether there are any looseness or jamming phenomena. If so, reinstall and tighten the reels. Next, check whether there are foreign objects blocking the conveying channels, such as paper scraps or dust. Clear the conveying channels to ensure they are unobstructed. In addition, check whether the surfaces of the conveying rollers are worn or have sticky substances attached. If the wear is severe, replace the conveying rollers. If there are sticky substances, use cleaning solvents to remove them. Then test the conveying system to observe whether the conveyance of the packaging materials returns to normal.
Poor Heat Sealing or Adhesive Effects
1.Failure Manifestation: For plastic film packaging, the heat-sealed parts are not tightly sealed, and air leakage or opening occurs. For paper packaging, the glued parts are prone to falling off.
2.Maintenance Methods: For heat sealing problems, check whether the temperature setting of the heat sealing device is appropriate. If the temperature is too low, appropriately increase the heat sealing temperature, but be careful not to exceed the tolerance temperature range of the packaging materials to avoid damaging them. Meanwhile, check whether the heat sealing molds are dirty or damaged. If there is dirt, clean the molds. If the molds are damaged, replace them with new ones. For paper packaging adhesion problems, check whether the amount of glue applied is sufficient and uniform. Adjust the parameters of the glue application device to ensure that the glue is applied evenly and in an appropriate amount. Also check whether there are oil stains, dust, or other factors affecting the adhesion effect on the bonding surfaces. If so, clean the bonding surfaces and then conduct packaging tests again.

III. Excessive Noise during Equipment Operation
Wear of Transmission Components
1.Failure Manifestation: The equipment emits abnormal harsh noises during operation, and the noise gradually increases with the running time.
2.Maintenance Methods: First, determine the source of the noise, which is usually transmission components such as gears, chains, and bearings. After stopping the machine, check these transmission components one by one. For gears, check whether the tooth surfaces are severely worn. If so, replace the gears. For chains, check whether the chain links are elongated or have knots. Depending on the situation, repair or replace the chains. For bearings, check whether they are lacking oil or severely worn. If lacking oil, add an appropriate amount of lubricating oil in a timely manner. If the wear is severe, replace the bearings. After replacing or repairing the transmission components, start the machine and check whether the noise has decreased to the normal range.
Looseness of Mechanical Structures
1.Failure Manifestation: The equipment has obvious vibrations and relatively large noises during operation, which may be due to the looseness of some mechanical structure components.
:2.Check the overall mechanical structure of the equipment, focusing on whether the bolts and nuts at each connection point are loose. Use wrenches and other tools to retighten the loose bolts and nuts to ensure the stability of the mechanical structure. Meanwhile, check whether the frame of the equipment is deformed or damaged. If so, repair or replace the frame components according to the situation. After the repair, run the equipment again to observe whether the noise and vibration have been improved.

IV. Electrical System Failures
Short Circuits or Open Circuits in Circuits
1.Failure Manifestation: The equipment suddenly stops running, the indicator lights on the control panel blink abnormally or do not light up, and there may be a burning smell.
2.Maintenance Methods: First, cut off the power supply of the equipment to ensure safety. Then, use a multimeter and other tools to check the circuits. Start from the power input end and gradually check the connection lines between each electrical component to see if there are any broken, short-circuited, or open-circuited lines. If a short-circuit point is found, repair or replace the damaged lines. For open-circuit problems, find out the cause of the open circuit and reconnect the lines. Meanwhile, check whether the electrical components (such as relays, contactors, switches, etc.) are damaged. If so, replace the corresponding electrical components. After the repair, conduct an insulation test on the circuit first. Ensure that the circuit is normal before powering on the equipment for trial operation.
Control System Failures
1.Failure Manifestation: The equipment operates in a disorderly manner, such as the cutting and packing actions are not coordinated, or it cannot run according to the preset program.
2.Maintenance Methods: Check the hardware devices of the control system, such as controllers and sensors. Check whether the controller has phenomena such as overheating or crashing. If so, try to restart the controller. If the problem persists, it may be necessary to update the firmware of the controller or contact the manufacturer for maintenance. For sensors, check whether they are blocked, damaged, or have abnormal signal transmission. Clean the surfaces of the sensors, repair or replace the damaged sensors. In addition, check whether there are errors or bugs in the software program of the control system. If so, conduct software debugging or reinstall the program. After the software is repaired, conduct a comprehensive test on the equipment to ensure that its operation returns to normal.

When maintaining A4 paper sheeting and packing machines, maintenance personnel should possess certain mechanical and electrical knowledge and maintenance experience, and strictly follow the operating procedures to ensure that the maintained equipment can operate safely, stably, and efficiently.