[Maintenance Must-Read] Dispensing Machine Shutdown/Shift Handover Maintenance Guide: Say Goodbye to Adhesive Curing Issues!

This will ensure more stable operation and extend the service life of your equipment! 

🔍 1. Why Special Maintenance is Required During Shutdowns
✅  Adhesive Solidification Risk: Especially for two-component adhesives (e.g., AB adhesives), stagnation can lead to solidification in mixing tubes or valves, causing blockages.
✅ Seal Aging: Residual adhesives or solvents may corrode O-rings, pistons, and other components, resulting in leaks or inaccurate metering.
✅ Production Efficiency Impact: If adhesives solidify, restarting requires extensive cleaning or even part replacements, delaying production!  

👉 Thus, proper shutdown maintenance is critical!
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🛠️  2. Maintenance Protocols for Different Shutdown Durations

📌  Short-Term Shutdown (<2 hours, e.g., lunch breaks, short pauses)
🔹 Applicable Scenarios: Temporary shutdown with planned resumption of use. 
🔹 Operational Steps: 
1. Shut off the adhesive supply system (stop pressure supply to adhesive barrels or turn off feeding pumps) and remove the front-end disposable mixing tube.  
2. Switch to cleaning mode (if available) and flush the mixing tube and dispensing outlet with solvent (e.g., acetone, alcohol) for 10–20 seconds.  
3. If automatic cleaning is unavailable, manually inject cleaning solvent and perform 3–5 dry dispensing cycles to ensure no residue remains in the valve.  
4. Keep the dispensing valve slightly open (supported by some models) to prevent adhesive stagnation and curing.

📌 Shift Handover / Extended Shutdown (>2 hours, e.g., end-of-day, shift changes)
🔹 Applicable Scenarios: Daily operations conclude with plans to resume the next day.
🔹 Operational Steps:
1. Complete Adhesive Evacuation: Close the A/B adhesive inlet valves and drain residual adhesive from hoses and dispensing valves.
2. Solvent Flushing: Flush the mixing tube and dispensing valve 3–5 times with dedicated cleaning solvent (e.g., acetone, thinner) to ensure no adhesive residue remains.
3. Disassemble Cleanable Components (e.g., mixing tubes, static mixers, needles) and soak them in cleaning solvent for 30 minutes to 2 hours.
4. Lubricate Key Components: Apply a small amount of silicone oil or lubricant to valve pistons and O-rings to prevent drying or cracking.
5. Equipment Standby Mode (if applicable): Activate the "pressure-holding standby" function or perform periodic dry dispensing (every 4–6 hours).

📌  Long-Term Shutdown (>24 hours, e.g., holidays, equipment idling)
🔹 Applicable Scenarios: Equipment remains inactive for extended periods, such as during holiday closures or production line adjustments.  
🔹 Operational Steps:
1. Perform all cleaning procedures for extended shutdowns to ensure no adhesive residue remains in the pipelines.  
2. Drain the cleaning solvent to avoid corrosion of seals by residual solvent.
3. Dismantle and store consumables: Components such as mixing tubes, needles, and sealing rings should be removed and stored in a dry environment.
4. Pre-power-off inspection: Shut off the air and power supplies, ensuring no residual pressure remains in the equipment.

⚠️ 3. Precautions & Frequently Asked Questions

🔧 Maintenance Tips  
✔ Safety First: Wear gloves and goggles during cleaning, ensure proper ventilation, and avoid inhaling solvents.
✔ Adhesive Compatibility:
   - UV Adhesives → Require UV-compatible cleaners and must be stored away from light.
   - Silicone/Epoxy Resins → Fast-curing types need more frequent cleaning.
✔ Maintenance Logs: Record cleaning time, solvent type, and issues observed after each maintenance for traceability.

🚨 Troubleshooting Common Issues
❌ Clogged Dispensing Valve → Use a heat gun (≤80°C) to soften residual adhesive, then flush with solvent.
❌ Solidified Pipelines → Clear blockages with high-pressure cleaning equipment or pipeline rods; replace pipes if severely clogged.
❌ Leakage/Aged Seals → Inspect O-rings and replace them if necessary.

📋 4. Maintenance Tool Checklist

📞 5. Need Assistance? We're Here to Help! 
If you encounter any issues during maintenance, feel free to contact the Veady After-Sales Service Team:  
📱 Phone: 0512-66538861
📧 Email: veady@szweidi.com

We are always ready to provide technical support! 💪