Temperature impacts spray pattern by affecting viscosity. Viscosity changes with temperature, and uneven viscosity causes uneven film build and coating defects. Precisely controlling material temperature at the point of application, such as the nozzle, is needed to produce a perfect spray pattern and bead by keeping viscosity optimized.

1. THE IMPACT OF TEMPERATURE
ON SPRAY PATTERN
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2. • DESIGNERS AND MANUFACTURERS OF ADVANCED POINT-OF-USE TEMPERATURE AND
VISCOSITY CONTROL SYSTEMS FOR INDUSTRIAL FLUID DISPENSING PROCESSES SINCE
1990
• SPECIALIZING IN BOTH RECIRCULATING AND “DEAD-END” SYSTEMS WITH MORE
THAN 3500 ACTIVE INSTALLATIONS
• LOW VISCOSITY (<1 CPS) TO HIGH VISCOSITY (>1,000,000 CPS) APPLICATIONS
STANDARD AT PRESSURES FROM 0.4 BAR (5 PSI ) – 400 BAR (6000 PSI)
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3. SO WHO CARES?
• THOSE 3500+ TEMPERATURE CONTROL INSTALLATIONS
INVOLVED SOME OF THE TOUGHEST APPLICATIONS IN
PARTNERSHIP WITH DEMANDING CUSTOMERS LIKE:
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4. (Valspar - 080 White Polyester)
Data Courtesy of
Alsco Metals Corporation
10
15
20
25
30
35
40
45
50
55
60
15 20 25 30 35 40
Temperature (°C)
Viscosity
(Zahn#4Seconds)
SOLVENTBORNE COATINGS
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5. Data Courtesy of
Sherwin-Williams Corporation
TEMPERATURE VS. VISCOSITY BY COLOR
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6. SPRAY COATING
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7. BASIC CONFIGURATION
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8. •
16°C - 5.8mm
21°C - 7.3mm
27°C - 8.9mm
32°C - 9.7mm
38°C - 10.4
18.3C
203mm
40.6C
394mm
37.8C
375mm
35.0C
356mm
32.2C
337mm
29.4C
318mm
26.7C
286mm
23.9C
254mm
21.1C
229mm
Heavy Edges
Uneven
Coating
Thin,
Uneven
Coating
Heavy Edges
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9. THE EFFECT OF UNEVEN FILM BUILD
Substrate
Slower Cure
Faster Cure
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10. THE EFFECT OF UNEVEN FILM BUILD
Blisters/Uncured
Coating
Substrate
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11. CORRECTING UNEVEN FILM BUILD
Even Cure
STRIPSTRIPSubstrate
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12. THE GOAL
THE GOAL IS TO STABILIZE AND OPTIMIZE
THE VISCOSITY OF THE COATING MATERIAL
AT THE POINT OF USE WHICH,
IN SPRAY SYSTEMS, IS
THE NOZZLE ORIFICE…

13. THERMAL LOSS
• NO GAPS ALLOWED IN TEMPERATURE
CONTROL ENVELOPE
• GRAPH FOR STAINLESS STEEL DISPENSE
VALVE IN AMBIENT
• OK IN CONTINUOUS OPERATION
• 10 MINUTE PAUSE IN AMBIENT CREATES
A SIGNIFICANT VISCOSITY CHANGE IN
THE MATERIAL
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14. SPRAY PATTERN IMPACT
• CHANGE IN SPRAY PATTERN CAUSED BY
CHANGE IN VISCOSITY RESULTING FROM
DIFFERENCES IN MATERIAL
TEMPERATURE
• FIXED ORIFICE
• CONSTANT PRESSURE
• CONSTANT PATH AND SPEED
• UNACCEPTABLE RESULTS
• NO DIFFERENCE BETWEEN ROBOT
AND OPERATOR
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15. POINT-OF-APPLICATION
• TO PRODUCE THE PERFECT BEAD OR SPRAY PATTERN, IT IS ESSENTIAL
TO DISPENSE THE SEALER OR ADHESIVE AT EXACTLY THE RIGHT
VISCOSITY
• THIS MEANS CONTROLLING THE TEMPERATURE OF THE MATERIAL AS IT IS BEING
DISPENSED
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16. THANK YOU!!
PLEASE COME SEE US AT:
www.viscosity.com
AND VISIT OUR BLOG AT:
blog.viscosity.com/blog
AND OUR YOUTUBE CHANNEL:
https://www.youtube.com/channel/UCVyAgTJtgNZTozqFeBc
CeNA
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