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Expert Forum parts2clean 2017 / Session „Specialised technologies - surfaces and plastics“
Painting with nearly no rejects
Pretreatment with CO2 Snow Blasting
Felix Elbing CryoSnow GmbH
Conventional cleaning
State of the art
• Manual wiping with isopropanol
• Ostrich-spring brush stations with suction
• Blowing stations
• Multi-zone continuous spraying systems (Powerwash)
• Chamber spraying systems
Disadvantages Powerwash
• High required space
• Problems with remaining water
• High operating costs (also for drying)
• Complex maintenance
• Possible bacterial attack
Process
CO2 snow jetting
• Solid CO2 snow particles (dry ice, -78 °C, 1-200 µm) are blasted with compressed air (100-200 m/s) onto surface to be cleaned
• Dry and leaving no residue due to complete sublimation of CO2 snow particles
• Environmental-compatible without water, VOCs and chemicals
• Flexible regarding contamination and substrate material
• Automation with axis robot or linear unit
• Simple logistics, minimum maintenance and small required space
Cleaning mechanism
CO2 snow jetting
I. II. III.
I. Thermal effect
CO2 snow particles cool the impurities abruptly which leads to a separation from the substrate.
II. Mechanical effect
By blasting along the surface impurities are removed from the substrate.
III. Sublimation effect
Due to the sudden sublimation of the CO2 particles, small surges in pressure are created.
1 CO2 snow particle 2 Contamination 3 Substrate
Contamination
CO2 snow jet
Exhaust air
Substrate
Jetting nozzle
CO2 snow jetting module JM-16iso+
• High cleaning effiency up to 2 m2/min with jet width up to 125 mm and feed rate up to 1,200 mm/s
• Compact and light (approx. 3 kg)
• Very efficient CO2 snow particle generation and dosing at low CO2 consumption (20-50 kg/h)
• Compr. air consumption (60-180 m3/h)
• Especially for automated use
• No condensation (water or ice), complete thermal insulation
• According to standards of automotive industry
JM-16iso+
2 x JM-16
Equipment
Equipment
Control cabinet CC-Pxx
CC-P02
• Fully automated in continuous operation
• Small required space
• For new and refit installations
• Process monitoring (pressure, temperature, flow, consumption)
• Simple interface to system control CC-P01
Flat bed plastics painting
• Control cabinet CC-P02
• 2 x jetting module JM-16iso+ with flat nozzle FN-16-50x4
• CO2 consumption 80 kg/h
• Compr. air consumption 300 m3/h
• Operating costs: < 10 €/h
Pretreatment before painting
• Control cabinet CC-P01
• Jetting module JM-16 with flat nozzle FN-16-100x2.5
• CO2 consumption 30 kg/h
• Compr. air consumption 120 m3/h
• Operating costs: < 5 €/h
Robot plastics painting
Pretreatment before painting
Pretreatment before painting
Advantages
• Removal of particles, fibers, additives, releasing agents, abrasive dust and fingerprints
• Without aftertreatment respectively drying
• No thermal or mechanical influence on the substrate material
• Simple supply logistics with compressed air and liquid CO2
• Increasing the surface energy and improved paint adhesion
Disadvantages
• Sound level due to fast flow of CO2 snow jet Cabin enclosure
• Disposal of gaseous CO2 Exhaust ventilation system CO2 monitoring, MAC value 0.5 vol.%
References
References
Contact parts2clean
Hall 5 Booth E35