Fully Automatic Glue Dispensing Machines Guide: Bubble Issues, Maintenance, Cleaning & Safety Checks

26/12/2025

Fully Automatic Glue Dispensing Machines
are widely used in electronics manufacturing, automotive components, LED assembly, medical devices, and precision industrial production. These machines are designed to deliver consistent adhesive volume, accurate positioning, and high repeatability—key factors for modern automated manufacturing.

Despite their high level of automation, many users still encounter recurring operational questions during daily production. Among the most frequently searched and discussed issues are:

  • Why bubbles appear in dispensed glue
  • How to properly maintain and clean an automatic glue dispenser
  • What safety checks are required before operating glue dispensing machines

This in-depth article answers these questions from a practical, engineering-focused perspective. Based on real production scenarios and long-term field experience, it provides actionable guidance to help manufacturers improve dispensing quality, extend equipment lifespan, and ensure safe operation.


Understanding Fully Automatic Glue Dispensing Machines

A fully automatic glue dispensing machine is an integrated system combining motion control, precision dispensing valves, programmable controllers, and material feeding units. Unlike manual or semi-automatic systems, it performs dispensing tasks with minimal human intervention.

Typical applications include:

  • SMT and PCB board bonding
  • Chip underfill and encapsulation
  • LED module and strip assembly
  • Automotive sensor sealing
  • Medical device and consumable bonding

Because these machines operate at high speed and precision, even small process deviations—such as air bubbles, contamination, or improper setup—can lead to visible defects and yield loss.


1. Why Does My Dispenser Produce Bubbles in the Glue?

1.1 What Glue Bubbles Look Like in Production

Glue bubbles typically appear as small air pockets inside dispensed dots or lines. In finished products, they may cause:

  • Reduced bonding strength
  • Inconsistent adhesive thickness
  • Electrical insulation failure
  • Cosmetic defects on visible surfaces

In high-reliability industries such as automotive electronics and medical devices, even microscopic bubbles can lead to product rejection.

1.2 Main Causes of Bubble Formation

Bubble issues in fully automatic glue dispensing machines usually originate from material handling or system configuration rather than the machine itself. Common causes include:

  • Air trapped in adhesive cartridges during loading or refilling
  • Insufficient degassing of high-viscosity adhesives
  • Improper back-suction settings causing air intake
  • Loose fittings or tubing connections
  • Inconsistent pressure supply

1.3 Material Properties That Increase Bubble Risk

Certain adhesives are more prone to bubble formation:

  • Silicone adhesives with high elasticity
  • Epoxy adhesives containing fillers
  • Moisture-sensitive materials

These materials require stricter control of temperature, pressure, and feeding methods to avoid air entrapment.

1.4 Effective Solutions to Eliminate Glue Bubbles

To minimize or eliminate bubbles in glue dispensing:

  • Use vacuum degassing before loading adhesive
  • Adopt bottom-up filling methods for cartridges
  • Optimize dispensing pressure and valve response
  • Inspect tubing and connectors for leaks
  • Maintain stable temperature during dispensing

Professional machine suppliers often integrate bubble prevention features directly into their fully automatic glue dispensing systems.


2. How to Maintain and Clean an Automatic Glue Dispenser?

2.1 Why Maintenance Matters

Regular maintenance is essential for maintaining accuracy, consistency, and uptime. Poor maintenance is one of the leading causes of:

  • Nozzle clogging
  • Irregular glue flow
  • Valve failure
  • Unexpected downtime

A well-maintained glue dispensing machine not only performs better but also reduces long-term operating costs.

2.2 Daily Maintenance Checklist

Daily maintenance tasks should include:

  • Cleaning nozzle tips after each shift
  • Purging adhesive lines to prevent curing
  • Checking air pressure and vacuum levels
  • Inspecting visible tubing for contamination

2.3 Weekly and Periodic Cleaning Procedures

On a weekly or scheduled basis, deeper cleaning is recommended:

  • Disassemble and clean dispensing valves
  • Flush adhesive paths with compatible solvents
  • Inspect seals and O-rings for wear
  • Verify dispensing calibration

Always use cleaning agents compatible with the adhesive and machine materials to avoid corrosion or seal damage.

2.4 Preventive Maintenance Best Practices

To extend the service life of fully automatic glue dispensing machines:

  • Follow manufacturer-recommended maintenance intervals
  • Keep detailed maintenance logs
  • Train operators on basic troubleshooting
  • Replace wear parts before failure occurs

Preventive maintenance is significantly more cost-effective than reactive repairs.


3. What Safety Checks Are Needed Before Operating Glue Dispensing Machines?

3.1 Why Safety Checks Are Critical

Glue dispensing machines operate with pressurized systems, moving mechanical parts, and chemical materials. Without proper safety checks, operators face risks such as:

  • Chemical exposure
  • High-pressure release
  • Mechanical injury
  • Electrical hazards

3.2 Pre-Operation Safety Inspection Checklist

Before starting a fully automatic glue dispensing machine, operators should verify:

  • Emergency stop buttons are functional
  • Protective covers and guards are in place
  • No visible leaks in glue or air lines
  • Electrical connections are secure
  • Correct adhesive material is loaded

3.3 Operator Safety and Training

All operators should receive training covering:

  • Basic machine operation
  • Emergency shutdown procedures
  • Safe handling of adhesives
  • Routine inspection and cleaning

Proper training significantly reduces accidents and improves overall production stability.

3.4 Environmental and Workplace Safety

The operating environment should meet basic safety standards:

  • Adequate ventilation for adhesive fumes
  • Stable temperature and humidity
  • Clean, dust-free workspace
  • Clearly marked safety zones

Why Choosing the Right Manufacturer Matters

The performance and reliability of fully automatic glue dispensing machines depend heavily on the manufacturer’s engineering capability and application experience.

Established in 2011, Shenzhen ZCX Technology Co. Ltd. is a manufacturing and trading combination enterprise offering integrated services including design, development, consultation, production, and technical support. With deep expertise in glue dispensing machines and silicone extrusion equipment, ZCX works as a long-term technical partner rather than just an equipment supplier.

ZCX focuses on helping customers solve real production problems—such as bubble control, dispensing stability, and safety compliance—through customized solutions and continuous technical support.


Conclusion: Improving Reliability and Safety in Glue Dispensing Operations

Bubble formation, inadequate maintenance, and insufficient safety checks are among the most common challenges faced by users of fully automatic glue dispensing machines. Fortunately, these issues can be effectively controlled through proper material handling, regular maintenance routines, and standardized safety procedures.

By investing in the right equipment and working with an experienced manufacturer, manufacturers can achieve higher product quality, longer machine life, and safer working environments.


Contact ZCX for Professional Glue Dispensing Solutions

If you are looking for reliable, high-performance Fully Automatic Glue Dispensing Machines or need expert guidance on dispensing optimization, maintenance, or safety compliance, Shenzhen ZCX Technology Co. Ltd. is ready to support your project.

👉 Visit www.zcxmachine.com to explore our solutions or contact our engineering team for a customized consultation.

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