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Automatic self-adhesive labeling machine is a kind of efficient automation equipment widely used in food, medicine, daily chemical, chemical, electronics and other industries. It can quickly and accurately stick labels on the surface of various bottles, boxes, cans and other containers. However, in the actual production process, the automatic self-adhesive labeling machine will inevitably have various faults in long-term use, which will not only affect the labeling quality, but also may cause production interruption.

This article will systematically sort out the common faults of automatic self-adhesive labeling machines to help users quickly identify the root cause of the problem, master the key points of troubleshooting, and propose effective solutions to ensure the stable operation of the equipment and maximize the labeling efficiency.

1. The label is skewed or not properly pasted

Fault manifestation:

The label is skewed on the surface of the product, or the labeling position is too high or too low, affecting the appearance and qualified rate.

Possible reasons:

The label positioning photoelectric sensor is offset;

The conveyor belt or product positioning device is not calibrated;

The friction between the label synchronization wheel and the label feeding wheel is uneven;

The shape of the object is irregular or not correctly guided;

The labeling speed does not match the conveying speed.

Troubleshooting and solutions:

Check whether the photoelectric eye is aligned with the edge of the label or the product trigger point;

Adjust the product guide or positioning mechanism to make the product consistent when entering the labeling area;

Check whether the labeling head and the conveyor belt are running synchronously;

Calibrate the labeling position to ensure that the label is stable and there is no advance/lag;

Replace the roller or transmission parts that are severely worn.

2. The label is wrinkled or has bubbles

Fault manifestation:

Crease marks or bubbles appear on the surface of the label after attachment, which seriously affects the appearance and use experience.

Possible reasons:

The label peeling angle is not suitable;

The labeling speed is too fast, exceeding the attachment speed;

The label material is too thin or the curling is uneven;

The pressure wheel or brushing device is not fully pressed;

The label backing glue is not suitable for the material to be attached.

Troubleshooting and solutions:

Optimize the angle between the peeling plate and the attachment surface, generally 20-30 degrees;

Adjust the labeling speed and synchronization mechanism to ensure consistent attachment;

Check the label supplier and select labels with moderate thickness and viscosity;

Increase the pressure of the label pressing device or improve the cleanliness of the labeling surface;

Use label exhaust hole design or anti-bubble adhesive.

3. The label cannot be peeled off normally or continuously labeled

Fault manifestation:

The label cannot fall off the base paper, or multiple labels are continuously output at one time, causing waste.

Possible reasons:

The peeling plate is worn or the angle is wrong;

The peeling strength between the label and the base paper is too large or uneven;

The traction wheel slips or the tension is unstable;

The label specification parameters are not set correctly;

The peeling photoelectric eye cannot accurately sense the label gap.

Troubleshooting and solutions:

Check whether the edge of the peeling plate is flat and adjust the angle appropriately;

Replace label materials with more stable quality;

Check whether the tension wheel and traction wheel are aging or loose;

Set appropriate label length parameters;

Clean or replace the label detection photoelectric sensor.

4. Missed or repeated labeling

Fault manifestation:

Some products are not labeled, or two labels are attached to the same product.

Possible causes:

The photoelectric eye position is offset, misjudging the product position;

Control system program delay or signal interference;

Label sensor misjudged the gap between the bottom paper;

Conveyor belt deviates or shakes.

Troubleshooting and solution:

Calibrate the product detection photoelectric sensor to avoid occlusion and reflection interference;

Check whether the PLC logic control has abnormal delays;

Replace label sensors with higher recognition accuracy;

Regularly check whether the transmission of the conveying system is stable to avoid jumping.

5. Label breakage or tearing

Fault manifestation:

The label is torn during the peeling process and cannot be fully labeled.

Possible causes:

Label tension is too large;

The edge of the peeling plate is too sharp;

The label material is too thin, aged or wet;

The labeling speed is too fast, resulting in uneven traction.

Troubleshooting and solution:

Reduce the tension of the tension regulator;

Check whether the peeling plate has burrs or wear;

Replace new labels and maintain a dry storage environment;

Reduce the labeling speed or improve the coordination of the labeling system.

6. Label deviation or label roll deviation

Fault manifestation:

The label deviates from one side, the label is not smooth, or the label roll displacement affects the normal label output.

Possible reasons:

The label roll is not placed correctly;

The label guide rod is not adjusted symmetrically;

The tension of the unwinding shaft is inconsistent on the left and right;

The traction wheel is not accurately aligned.

Troubleshooting and solution:

Adjust the installation of the label roll to make its axis symmetrical;

Check the guide wheel trajectory to ensure correct alignment;

Adjust the tension on both sides of the unwinding shaft to keep it consistent;

Replace or adjust the traction wheel position.

7. The labeling machine suddenly stops or cannot start

Fault manifestation:

The equipment automatically stops after running for a period of time, or the labeling process cannot be started.

Possible reasons:

Unstable power supply or damaged fuse;

PLC control system failure;

Servo motor or inverter overload;

Abnormal induction device, accidental triggering of safety mechanism;

Emergency stop button is not released.

Troubleshooting and solutions:

Check whether the power line, socket, and voltage are normal;

Check whether the electrical components in the control cabinet are overheated or burned;

Check the alarm information on the operation panel and locate the fault code;

Check whether the emergency stop button is accidentally touched;

Restart the program or contact technical support to restore the factory parameters.

8. The touch screen operation is stuck or unresponsive

Fault manifestation:

The touch screen has no display, slow response, or no feedback during operation.

Possible causes:

The control motherboard and the touch screen are abnormally connected;

Screen static interference or surface stains;

The program system freezes or runs abnormally;

Power module failure.

Troubleshooting and solutions:

Check the signal line connection and whether the plug is loose;

Clean the screen with a dry cloth to avoid moisture or oil;

Restart the system. If there is still no response, contact the self-adhesive labeling machine manufacturer for technical support;

Check whether there is overvoltage or undervoltage, and check the power supply stability.

As a key link in the automated packaging production line, the stable operation of the automatic self-adhesive labeling machine is related to the efficiency and quality of the entire production line. In addition to timely troubleshooting the above common faults, users should strengthen daily maintenance of the equipment, including but not limited to:

Daily inspection: clean the dust on the labeling head, the scraps of the bottom paper, and the surface of the sensor;

Weekly maintenance: tighten loose parts, lubricate moving parts, and check the circuit;

Regular calibration: parameters such as the position of the labeling head, the sensitivity of the photoelectric eye, and the label spacing;

Replace consumables: timely replace aging rubber rollers, worn traction wheels, and peeling plates.

In addition, it is recommended to choose equipment and after-sales services provided by regular self-adhesive labeling machine manufacturers to ensure that technical support and spare parts can be quickly obtained when a fault occurs, minimize downtime, and ensure corporate production efficiency.

If you are purchasing automatic self-adhesive labeling machines, you can use this article as a practical reference guide. If you need to know more about how to choose labeling machines model that suits your product type, please feel free to contact us for professional advice and customized solutions.

http://www.beiltpack.com
Shanghai BEILT Machinery Equipment Co., Ltd

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