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