8 Common Glue Dispensing Issues and Effective Solutions
In today’s fast-paced manufacturing environment, effective glue dispensing is essential for maintaining productivity and ensuring product quality. However, users of dispensing machines often encounter common problems that can hinder operations. Leading dispensing machine manufacturers play a crucial role in addressing these challenges by continually improving their equipment’s design and functionality. This blog discusses eight common issues faced when working with dispensing machines and provides practical solutions to each problem. Additionally, it highlights the importance of fillers in adhesives and sealants and how they enhance performance.
1. Glue Dripping from Valves
One prevalent problem when using dispensing machines is glue dripping from the valves. This occurs when the needle aperture size is inadequate for the viscosity of the adhesive being dispensed. A smaller needle can cause high back pressure, resulting in drips even after the valve is closed.
Solution: To resolve this issue, consider using larger needle apertures. Larger needles allow for a smoother flow, significantly reducing the chances of glue dripping. Additionally, ensuring that the glue is well-conditioned before dispensing can help in maintaining consistent flow rates.
2. No Glue Coming Out
Another common issue is when no glue comes out of the dispensing machine. This can be incredibly frustrating, as it delays production and may lead to wasted materials. The primary causes are often clogs within the machine or insufficient pressure to dispense the adhesive.
Solution: First, ensure that the machine is entirely clean and check for any blockages in the dispensing needle or the adhesive supply line. Regular maintenance can help avoid these issues. Furthermore, ensuring that the pressure settings are adequate for the type of adhesive can prevent this problem.
3. Slow Glue Flow Rate
Manufacturers often rely on consistent and rapid glue application for efficiency, which can be hampered when the glue flow rate is too slow. Slow dispensing can be attributed to various factors, including long tubing or improper pressure settings.
Solution: To enhance the glue flow rate, minimize the length of the dispensing pipe. Shorter piping reduces resistance and allows for faster adhesive delivery. Additionally, adjusting the air pressure settings to meet the specifications of the dispensing system can further increase the flow rate.
4. Air Bubbles in the Liquid
Air bubbles in the dispensing liquid can cause inconsistencies in the application and lead to defects in the final product. Air can enter the system from various sources, including improper sealing of the adhesive container or during the adhesive mixing process.
Solution: To minimize this issue, it’s critical to maintain a clean and airtight environment for adhesive storage. Regularly check for leaks and ensure that air is evacuated from the system before dispensing. Adjusting fluid pressure and minimizing the time the valve is open can also help eliminate air from the dispensing process.
5. Inconsistent Flow Rates
Inconsistent glue output can lead to uneven application on products. This inconsistency can arise due to fluctuations in pressure within the dispensing cylinder or variations in adhesive viscosity.
Solution: Stabilizing the pressure in the cylinder is crucial for consistent outputs. Regular maintenance and calibration of the dispensing machine will ensure that pressure levels are optimal. Monitoring environmental factors that affect the adhesive’s viscosity, such as temperature, can also help maintain consistent flow rates.
6. Glue Stringing
Glue stringing occurs when a thin thread of adhesive is left behind as the dispensing head moves away from the application surface. This not only results in waste but can also affect product appearance and quality.
Solution: Adjusting the position of the glue head and refining the dispensing parameters can significantly reduce stringing issues. Lowering the dispensing pressure or reducing the amount of adhesive dispensed can also help in minimizing string formation. Incorporating ‘wipe’ functions on the dispensing head may aid in cleaning excess glue as the head retracts.
7. Sensor Issues
Sensors play a crucial role in the functionality of dispensing machines. If sensors fail or provide inaccurate readings, the dispensing process can be compromised.
Solution: Regular checks on the sensor functionality are essential. Ensure that sensors are clean, properly calibrated, and functioning optimally. Consider implementing a routine maintenance schedule to keep the sensor system in good working condition.
Understanding the Importance of Fillers in Adhesives and Sealants
Fillers play a significant role in the performance characteristics of adhesives and sealants. They contribute to certain essential properties that enhance the overall effectiveness of the adhesives. Here are some key benefits of using fillers:
• Improving Thermal Conductivity: Fillers like alumina and silica can enhance the thermal conductivity of adhesives, making them critical for electronics that require effective heat dissipation.
• Reducing Weight: In aerospace applications, using lightweight fillers allows for the creation of strong yet lightweight adhesives, essential for component efficiencies.
• Enhancing Wear Resistance: Fillers improve the wear and tear resistance of adhesives, which is vital for applications exposed to various stress factors and environmental conditions.
Conclusion
Operating dispensing machines comes with its set of challenges, but understanding common problems and their solutions empowers users to maintain efficiency and product quality. Proper maintenance, routine checks, and adapting to the specific properties of adhesives by utilizing effective fillers can significantly enhance adhesive performance. Manufacturers should prioritize establishing efficient glue dispensing processes to drive productivity and ensure customer satisfaction in their operations.
By addressing these common issues and recognizing the importance of fillers, users can optimize their dispensing systems and achieve the best possible outcomes in their manufacturing processes.
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