Common Faults and Solutions of Glue Dispensing Machines

In industrial production, glue dispensing machines serve as key equipment for fluid encapsulation, and their stable operation is directly linked to production efficiency and product quality. However, during long-term use, affected by operational methods, environmental factors, and equipment wear and tear, glue dispensing machines are inevitably prone to minor faults. Today, we have compiled several of the most common faults along with detailed troubleshooting steps that even beginners can easily understand and follow. It’s worth saving for future reference!

1. Uneven Glue Dispensing (Fluctuating Output)

This is a common issue encountered by many users. Fluctuating glue output leads to inconsistent encapsulation thickness of products, affecting subsequent use.

Possible Causes:

• Unstable glue viscosity due to temperature changes affecting fluidity;

• Clogged glue outlet resulting in unsmooth glue flow;

• Unreasonable pressure settings or fluctuations in the pressure control system;

• Aging hoses with internal damage or blockages.

Solutions:

1. Check the glue storage environment. If the glue viscosity is abnormal, adjust the temperature according to the glue instructions to ensure stable fluidity;

2. Turn off the equipment power, disassemble the glue outlet accessories, and clean residual glue with a special cleaning solution to ensure unobstructed glue flow channels;

3. Review the pressure parameter settings, fine-tune the pressure value according to the current glue type and encapsulation requirements, and observe if the glue dispensing returns to uniformity;

4. If the hose is aging, promptly replace it with a hose of the same model to avoid the impact of hose issues on dispensing performance.

2. Glue Leakage/Dripping from the Outlet

After dispensing, glue still leaks or drips from the outlet, which not only causes glue waste but also contaminates products and the production environment.

Possible Causes:

• Worn seal rings of the glue valve, leading to decreased sealing performance;

• Delayed closing of the glue valve or slow response of the solenoid valve;

• Low glue viscosity with excessive fluidity, making residual glue prone to dripping.

Solutions:

1. Disassemble the glue valve, check if the seal ring is worn or deformed, and replace it with a suitable one if there is any problem;

2. Inspect the working status of the solenoid valve, clean internal impurities of the solenoid valve, and ensure flexible switching and timely response of the valve;

3. If the glue viscosity is too low, consult the glue supplier to adjust the viscosity without affecting product quality, or appropriately reduce the dispensing speed to minimize residue.

3. Uneven Glue Mixing

For two-component glue, uneven mixing directly results in poor product curing effects, such as softening and cracking.

Possible Causes:

• Incorrect glue mixing ratio settings;

• Clogged or damaged mixing tubes, leading to ineffective stirring function;

• Excessively fast dispensing speed, causing encapsulation before the glue is fully mixed.

Solutions:

1. Recheck the glue mixing ratio instructions, correct the ratio parameters on the equipment, and ensure accurate proportions;

2. Replace with a new mixing tube, check if the mixing tube is properly installed, and ensure the stirring function is normal;

3. Appropriately reduce the dispensing speed to allow sufficient mixing time for the glue. Conduct a small-volume test dispensing first, and proceed to mass production only after confirming uniform mixing.

4. Failure to Start the Equipment Normally

The equipment fails to start after being powered on, directly affecting production progress. Such faults are mostly related to circuits and sensors.

Possible Causes:

• Poor power connection, loose plugs, or damaged wires;

• Emergency stop button not reset or safety door not closed properly;

• Sensor malfunctions, such as abnormalities in liquid level sensors or position sensors.

Solutions:

1. Check if the power plug is firmly inserted and if the wires are damaged or aging. Repair or replace them promptly if there are any issues;

2. Check the status of the emergency stop button, rotate it clockwise to reset, confirm the safety door is fully closed, and ensure the equipment meets the safety conditions for startup;

3. Inspect the connecting wires of each sensor, clean impurities on the sensor surface, and contact professional personnel for maintenance or replacement if the sensor is damaged.

5. Frequent Alarms During Equipment Operation

The equipment suddenly alarms and shuts down during operation, with fault codes displayed on the screen. It is necessary to clarify the alarm cause before handling.

Possible Causes:

• Low glue level triggering low-level alarm;

• Abnormal equipment temperature exceeding the set range;

• Jammed motion axis unable to move normally.

Solutions:

1. Check the glue level in the storage tank, replenish glue in a timely manner, and reset the alarm after replenishment;

2. Inspect the equipment heating or cooling system, confirm that the temperature parameters are set reasonably, and contact for maintenance if the temperature sensor malfunctions;

3. Turn off the equipment power, check if there are any foreign objects blocking the motion axis track, clean the foreign objects, manually move the axis to confirm smooth movement, and then restart the equipment.

6. Daily Maintenance Tips to Reduce Faults

In fact, many faults can be avoided in advance through daily maintenance. It is recommended to do the following:

• Regularly clean the glue outlet, mixing tube, hose, and other components to avoid clogging by residual glue;

• Replace lubricating oil according to equipment instructions to ensure smooth operation of moving parts;

• Keep the equipment working environment dry and clean to avoid dust and moisture affecting electrical components;

• Operators must use the equipment in strict accordance with operating specifications to avoid faults caused by incorrect operations.

The above are the common faults and solutions of glue dispensing machines, covering the problems that are likely to be encountered during operation and maintenance. If you encounter faults not mentioned above, it is recommended to first check the equipment manual or contact the professional technical personnel of the equipment supplier for assistance. Do not disassemble core components by yourself to avoid further damage. Save this article for quick reference when problems arise in the future, helping you resolve faults efficiently and ensure smooth production!