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Lechler Ltd
1 Fell Street, Newhall
Sheffield, S9 2TP, England
Tel: +44(0)114 249 2020
info@lechler.com
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VarioSpray II

Nozzle valve system for the variable atomization of very small liquid volumes

Innovative spraying technology opens up new applications
The pressure to standardize is increasing in almost all areas, and the demand for more economical and more environmentally friendly production processes is growing. The newly developed Lechler VarioSpray II nozzle valve system with pulse width modulation impresses with its enormous flexibility and offers the possibility of spraying very small volumes of liquid with precision. In the case of hydraulic nozzle systems, the narrowest cross section of the spray nozzle determines the liquid flow rate. For reasons of economy and production however, it is not possible to reduce this narrowest cross sections to any further degree desired. For this reason there are physical limits to a nozzle’s minimum flow rate. Pneumatic systems are therefore used in order to realize the lowest flow rates. 

This allows very small flow rates to be generated by using air. However, this pneumatic atomization has its limits where the volumes delivered must be varied and adapted to changed process parameters. This often makes control disproportionately complex. Using air can also have an unfavorable effect of operating costs, as aerosols form and liquid is lost due to the rebound effect. VarioSpray II allows very small volumes of liquid to be atomized while using hydraulic nozzles at the same time.


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Flexible System

  • Simple change to the pulse width and cycle frequency
  • Flushing function
  • Modular design and modular system
  • Start/Stop signal (e.g. via light barrier)

 

Characteristics

   

The benefits to you


Minimum flow rates
- Liquid saving
- No expensive and complex twin-fluid system
LechlerDE-Shop:/images/pfeil_rechts.png Cost reduction
LechlerDE-Shop:/images/pfeil_rechts.png Increased efficiency

Frequency up to 100Hz
- Flexible belt speeds
LechlerDE-Shop:/images/pfeil_rechts.png Increased productivity
LechlerDE-Shop:/images/pfeil_rechts.png Production time reduction

Control ratio up to 11 : 1
- Large flow rates covered with one nozzle
LechlerDE-Shop:/images/pfeil_rechts.png No nozzle change

Variable flow rate
- Flexible adjustment of the volume applied for different products
LechlerDE-Shop:/images/pfeil_rechts.png Product change time reduction

Different flow rates have no influence on spraying parameters
- Constant spray angle
- Constant droplet size
LechlerDE-Shop:/images/pfeil_rechts.png Constant process parameters

Flow rate is not regulated via the pressure
- No high pressure required
- Simple configuration
LechlerDE-Shop:/images/pfeil_rechts.png Short installation time
LechlerDE-Shop:/images/pfeil_rechts.png Low maintenance costs
LechlerDE-Shop:/images/pfeil_rechts.png Low operating costs

Low-wear valve
- Only one movable object
LechlerDE-Shop:/images/pfeil_rechts.png Low maintenance

No atomization air
- No aerosol formation
- Less liquid loss
LechlerDE-Shop:/images/pfeil_rechts.png Less risk to health
LechlerDE-Shop:/images/pfeil_rechts.png Does not pollute the environment
LechlerDE-Shop:/images/pfeil_rechts.png Cost reduction

Not susceptible to blockages
- Larger cross sections compared to normal nozzles
LechlerDE-Shop:/images/pfeil_rechts.png Increased operating safety



Applications


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Coating

• Food industry
- Vitamin spraying
- Spraying of low-viscosity sugar solutions

• Beverage industry
- Anti-Scuffing of glass bottles

• Disinfection
- Hygiene applications
    • Nanoparticle application
- Construction industry
- Fabric processing

• Release agent application
- Application of demoulding oils
- Foil production
- Coating of plastic moulds
- Electronics application

LechlerDE-Shop:/images/02_produkte/industrie/content/variosprayII/anwendung_befeuchten.jpg

Moisturizing

• Food Industry
- Product moisturizing

• Paper industry
- Moisturizing
- Moisturizing of printing rollers



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Belt lubrication

• Automotive industry
- Application of anti-corrosion agent

• Degreasing systems






What is pulse width modulation?

Pulse width modulation refers to the variation of the ON time ton /OFF time toff of a square-wave signal when the frequency f remains constant. Here, the frequency f corresponds to the reciprocal value of the period duration T.


The ratio of the ON time ton to the period duration T is referred to as the pulse width ration (DC = duty cycle). The pulse width ration determines the flow rate. The valve is open during the ON time ton. The shorter the DC, the less the flow rate. Depending on the frequency selected, the pulsation is barely perceptible to the naked eye.

LechlerDE-Shop:/images/02_produkte/industrie/content/variosprayII/pulsewidthratio_95.jpg     LechlerDE-Shop:/images/02_produkte/industrie/content/variosprayII/pulsewidthratio_15.jpg