Clean glass is essential for many downstream processes, including tempering, coating, insulating glass production, laminating, printing and assembly.
However, simply increasing the number of washing brushes or increasing water flow does not always improve cleaning quality.
A stable washing result requires the entire system to work together.
Here are the key factors that influence glass washing quality.
1. Choose the Correct Brush Configuration
The brush system should match the type of glass being processed.
Different applications may require different brush materials, brush arrangements and cleaning pressures.
For example, coated and Low-E glass generally requires more careful cleaning parameters than ordinary uncoated glass.
The objective is to achieve sufficient cleaning without unnecessary mechanical contact.
2. Control Brush Pressure
Brush pressure is one of the most important parameters.
Too little pressure may result in incomplete cleaning.
Excessive pressure can increase mechanical contact and may not provide additional cleaning benefits.
The correct pressure depends on:
- Glass type
- Glass thickness
- Surface coating
- Glass speed
- Contamination level
- Brush type
3. Maintain Good Water Quality
Water quality directly affects the final appearance of washed glass.
Minerals and impurities in the water can leave deposits or spots after drying.
For high-quality applications, consider:
- Water filtration
- Water circulation
- Water replacement
- Water treatment
- Final-rinse water quality
The water system should be maintained according to the actual local water conditions.
4. Check the Glass Feeding Speed
Washing performance is related to glass speed.
If the glass moves too quickly for the washing and drying system, there may not be sufficient cleaning or drying time.
When increasing production speed, the entire washing system should be evaluated.
This includes:
- Brush speed
- Water flow
- Contact time
- Rinsing
- Air-knife performance
- Glass conveying stability
5. Optimize the Drying System
A glass surface may be clean but still appear poor if water remains on the surface.
Common causes include:
- Insufficient air pressure
- Incorrect air-knife position
- Worn sealing components
- Excessive glass speed
- Uneven air distribution
- Poor machine sealing
The drying section should therefore be treated as an integral part of the washing system.
6. Keep Brushes Clean
Brushes accumulate particles and contaminants during continuous production.
If they are not properly maintained, the cleaning performance can gradually decrease.
Regular inspection should include:
- Brush condition
- Brush wear
- Brush cleanliness
- Rotation condition
- Drive components
- Brush pressure
Maintenance intervals should be based on production volume and glass contamination.
7. Clean the Water System
Water tanks and circulation systems can accumulate:
- Glass particles
- Dust
- Sludge
- Processing residues
Regular cleaning helps prevent these contaminants from returning to the glass surface.
The water circulation system should be inspected as part of routine machine maintenance.
8. Maintain the Air Knives
Air knives are critical for removing water from the glass.
Check:
- Air pressure
- Air volume
- Air-knife alignment
- Distance to the glass
- Nozzle condition
- Air cleanliness
Small changes in the drying system can significantly affect the final appearance of the glass.
9. Match the Washer to the Application
A common mistake is selecting a washer based only on maximum glass width.
A more complete evaluation should include:
Glass type + thickness + size + contamination + production speed + required surface quality
For example, a washer for architectural glass may have different requirements from a washer for Low-E, solar or appliance glass.
10. Establish a Preventive Maintenance Program
Consistent washing quality requires consistent machine maintenance.
A preventive maintenance program should include:
Daily Checks
- Water condition
- Brush operation
- Air-knife performance
- Glass conveying
- Abnormal noise or vibration
Regular Checks
- Brush wear
- Bearings
- Motors
- Belts
- Water pumps
- Sealing components
- Electrical components
Periodic Maintenance
- Water tank cleaning
- Internal machine cleaning
- Conveyor inspection
- Electrical inspection
- Air system inspection
11. Troubleshooting Common Washing Problems
| Problem | Possible Cause |
|---|---|
| Water spots | Poor water quality or insufficient drying |
| Glass not fully clean | Brush configuration, pressure or speed |
| Uneven drying | Air-knife alignment or air distribution |
| Glass scratches | Incorrect brush/contact conditions or contamination |
| Excessive water inside machine | Sealing or water-flow issue |
| Reduced cleaning performance | Dirty or worn brushes |
| Inconsistent results | Unstable speed, water flow or machine parameters |
The exact cause should be identified before changing machine parameters.
TECHWIN Approach to Glass Washing Quality
TECHWIN designs washing systems around the customer’s glass type, dimensions, production speed and downstream process.
Depending on the application, solutions can include:
- High-speed washing
- Low-E glass washing
- Jumbo glass washing
- Vertical washing
- Solar glass washing
- Disc-brush washing
- Sponge roller washing
The goal is not simply to wash the glass, but to provide a stable cleaning and drying process that fits the customer’s complete production line.
FAQ
Why does washed glass have water spots?
Water spots can be caused by water quality, insufficient drying, contamination or incorrect drying parameters.
Why is my glass washer not cleaning properly?
Possible causes include worn brushes, incorrect brush pressure, contaminated water, excessive production speed or unsuitable machine configuration.
Can washing speed be increased?
It may be possible, but the brush system, water flow and drying capacity must all support the higher speed.
How often should a glass washer be maintained?
Maintenance frequency depends on glass type, production volume and working conditions. Regular inspection and preventive maintenance are recommended.
Need Help Optimizing Your Glass Washer?
If you are experiencing water spots, incomplete cleaning, unstable drying or other washing problems, TECHWIN can evaluate the application and recommend suitable machine configuration and process parameters.
Contact TECHWIN for a glass washing solution designed around your production requirements.
