Kurita Dropwise-Technology provides excellent application results in the Paper Dryer Section and significantly reduces the total cost of ownership. As a result of years of experience, Kurita developed Dropwise Technology where heat transfer improves by forming a water-repellent film on surfaces in the rotating cylinders of the dryer section. Learn more: https://www.kurita.eu/en/dropwise-technology

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Kurita Dropwise Technology
Increasing the Efficiency in the Paper Dryer Section
1

2. 2
Kurita Dropwise Technology for paper dryer section

3. 3
Kurita Dropwise Technology Introduction
Rotating cylinders are heated
by steam for moisture removal
Kurita Dropwise Technology
Drying Section
The dryer section is by far the largest energy consumer in the
paper industry. It constitutes almost 40% of total capital cost of
the paper machine.
Kurita Dropwise Technology leads to significant energy savings
and leads to high economic benefits for the customer.
Steam
Reduced steam
consumption
Benefits
Increased production
Reduced steam
pressure
Reduced
maintenance fee
Reduced fuel cost
Corrosion inhibition
Total Cost of Ownership reduction

4. 4
Kurita Dropwise Technology Mechanism
Adsorption of KURITA DW on the metal surface forms a
hydrophobic film.
Change from water film condensation to dropwise condensation.
Result: Increase of heat transfer efficiency.
Metal surface
Hydrophobic film
Filmforming substance Water droplets

5. 5
Without Treatment KURITA Dropwise Technology
Water film inside cylinder
interferes heat transfer
Water repellent conditions
improve heat transfer
Kurita Dropwise Technology Mechanism

6. Relation of water film thickness & heat transfer efficiency in Dryer
6
Kurita Dropwise Technology Treatment
0
10
20
30
40
50
60
70
80
90
100
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Heat
transfer
efficiency
(%)
(100%
=
0.0mm
water
film
thickness)
Water film thickness (mm)
Condensate
discharge
Heat transfer efficiency can be improved by forming
a hydrophobic film on heat transfer surfaces. Steam input
Even a thin water film layer inhibits
the heat transfer significantly

7. 7
Kurita Dropwise Technology Case Study
CASE STUDY
Significant energy savings after application of Kurita Dropwise Technology at the dryer section in a paper mill.
INITIAL SITUATION
WITHOUT Kurita Dropwise Technology
• Low water temperature
• Heat requirement for drying is high;
steam is not enough
• Customer was slowing down the
speed
AFTER
Kurita Dropwise Implementation
• No requirement to decrease the
paper machine speed during
winter time
• Additional profit of $23,100
(2,500,000 JPY) per month
10%
Less
steam
consumption
5%
More
productivity
10%
Reduction in
steam
pressure
5% production increase due to elimination of speed down
• Paper factory: Printing/writing paper
• Multi-cylinders
• Dryer diameter: 1.5 m
• Steam consumption: 280 t/day

8. 8
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Tokyo 164-000 | Japan
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Kurita Water Industries Ltd.