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W/IR technology – hot air & infrared drying for industrial processes

Thermal drying technology for water- and solvent-based coatings

IST METZ's W/IR technology is a powerful and energy-efficient solution for thermal drying in industrial processes. The intelligent combination of warm air (convection) and infrared radiation (IR) allows water and solvents to be removed reliably and evenly from paints, varnishes and coatings. The process is ideal for applications where reliable drying is required – regardless of subsequent curing or cross-linking steps.

Unlike UV or LED UV systems, W/IR technology is not based on a chemical reaction, but on the physical evaporation of liquid components. This offers maximum process reliability, high flexibility with different substrates and precise adaptation to individual production requirements.

With over 45 years of experience in UV, LED UV and thermal drying processes, IST METZ has comprehensive process expertise and develops tailor-made solutions for demanding industrial drying tasks.

Contact us to find out whether W/IR technology is the optimal solution for your application.

Basics of W/IR technology

The combination of warm air and infrared combines two physically different, complementary principles of action:

Infrared radiation (IR)

  • Direct energy input into the coating film
  • Rapid heating of the surface and liquid components
  • Accelerated evaporation of water and solvents

Hot air (convection)

  • Removal of evaporated media

  • Uniform temperature distribution
  • Stabilisation of the drying process

Only the interaction of both components enables controlled, uniform and reliable drying – even at high production speeds.

When is W/IR technology the right choice?

W/IR technology is particularly suitable for processes in which:

  • Water or solvents are present
  • UV or LED UV curing is not possible or insufficient
  • Substrates are temperature-sensitive
  • Pre-drying, intermediate drying or final drying is required

Typical materials:

  • Paper, cardboard
  • Wood, wood-based materials
  • Plastics
  • Metals
  • Composite materials

Comparison with UV and LED UV technologies

W/IR technology is not an alternative, but often a supplement to UV or LED UV processes – especially in hybrid production lines.

Technology  Principle of operation Typical application
UV / LED UV Photochemical cross-linking 100% solid UV inks and coatings
Hot air Convection     Classic wet coatings
IR Direct heat input Accelerated evaporation
W/IR IR + convection combined Efficient thermal drying

 

Typical areas of application for W/IR technology

The technology is used across a range of industries, including:

Printing industry

  • Drying conventional inks and varnishes
  • Preparation for subsequent UV/LED UV curing
  • Process stabilisation at high printing speeds

Industrial coatings

  • Wet coatings on metal, plastic or wood
  • Functional and protective coatings

Wood and furniture industry

  • Coating of panels, profiles and boards
  •  
  • Uniform drying of sensitive materials

Technical applications

  • Automotive supply industry
  • Electronics and special coatings

Advantages of W/IR technology at the process level

  • Shorter drying times
  • High energy efficiency through targeted heat input
  • Uniform drying without local overheating
  • High process reliability with changing materials
  • Scalability for different production requirements

The technology can be flexibly adapted to production speed, layer thickness and substrate.

W/IR as part of holistic curing and drying concepts

IST METZ does not view W/IR technology in isolation, but rather as part of integrated system solutions. In many applications, the greatest added value is achieved by combining:

  • W/IR drying to remove liquid components
  • UV or LED UV curing for final surface finishing

The result is highly productive, energy-efficient and stable production processes.

IST METZ: High-performance UV lamp and UV LED systems

From technology to system solutions

Based on W/IR technology, IST METZ develops individually configurable drying systems that are precisely tailored to the respective process.

You can find out more about specific system solutions on the relevant product pages, e.g. modular W/IR drying systems for industrial applications.