The strongest bonds for large plastic parts with 3D weld contours

Thermoplastics can be welded together using INFRARED radiation. Some of the radiation in infrared welding is absorbed by the material and transformed into heat. As a result, the surface layer is melted and the plastic components can be joined by being pressed together. Infrared heat is transferred without contact. The heat input is fast, specific and energy-efficient.

Power-controlled and time-controlled INFRARED emitters allow for precise and controlled welding processes. Typical applications are instrument panels, door trims and center consoles with complex, 2D or 3D welding contours. Particle-free welding is particularly used for joining air-duct pipes, fluid containers, tank systems and filters or filter housings.


Customized to suit your needs

The following quality and efficiency factors of joined plastics vary, depending on the final product and application:

  • Particle purity, such as for air or oil duct components (increasingly strict OEM regulations and norms)
  • Use of reinforced, high-performance plastics, such as fiberglass reinforced plastics in lightweight and structural components
  • Higher yield strength in security-relevant areas
  • 100 % gas-tight
  • Weldability of different materials
  • Design freedom, including welding complex, 3D-geometries
  • Productivity, economic viability and energy efficiency
  • And much more!


Trendsetting products
  • Large components, such as instrument/door panels, center consoles
  • Parts with complex 3D welding contours
  • Air ducts
  • Fluid reservoirs
  • Storage tanks, tank filters
  • Housings, such as air and other filter housings


Tooling and equipment from a single source

The quality and performance requirements of infrared plastic welds vary by product and application. We have a large selection of standard production solutions in our product portfolio:

  • JoinLine IR-V-RPS-Maxi
  • JoinLine IR-V-RPS-1800 Standard
  • JoinLine IR-V-ECO-1600
  • JoinLine IR-H-Highspeed
  • JoinLine IR-V-ECO-800
  • JoinLine IR-V-ECO-1200
  • JoinLine IR-H-500

We would love to help you find the perfect infrared welding solution for your product.


Quick tool change for optimal handling and the highest efficiency
  • Tooling equipped with glass bulb or foil emitters
  • Modular cartridge system
  • Sandwich construction for optimal protection of emitter field
  • Quick tool change (within 5 minutes)
  • Several cartridges applicable for one machine
  • Tool change trolley available
  • Tool change can be operated from the front or back side of the machine, according to the production conditions


Custom solutions for your project requirements

Glass Bulb Emitters

  • Radiation temperature approx. 1.800 - 2.400°C
  • Reach operating temperature within 1 second
  • Power up to 200 KW/m²
  • Short cycle times, typical heating period about 12 seconds
  • Greater distance to material possible, low risk of fire
  • Flexible heating via individual control of single radiator units
  • Fixed contour, standard or special design, e.g. 3D contours
  • Different wave lengths (0,78 μm to 2 μm)
  • Energy direction transmitters can be used for tolerance adjustments

Metal Foil Emitters

  • Radiation temperature approx. 700°C
  • Reach operating temperature within 8-10 seconds
  • Power up to 32 KW/m²
  • Longer cycle times necessary
  • Lower power and temperature requires short distance between emitters and material, higher fire risk
  • Only constant energy emission along length/width of the metal foils
  • Flexible contour, easy to adjust
  • Mid-wave system (2,1 μm to 3,6 μm)
  • Tolerances cannot be adjusted by energy direction transmitters


Controls, monitoring, and documentation for your IR machine

Various part contours and materials produce numerous parameters in the electrical controls system. We offer sophisticated, intuitive controls technology for reliable, high-quality processing of both small and large welding zones, various materials and material strengths, visible edges, and controlling overlapping emitters.

Operation and parameter entry are completed on a comfortable TouchPanel, integrated into either the operating panel or controls cabinet, depending on the machine's layout.

The following monitors are installed in our machines:

  • IR emitter power monitor
  • Freely adjustable power and delayed power for every control loop
  • Welding path and pressure monitor
  • Welding depth monitored by automatic registration of material height
  • Heat input into welding seam can be recorded with INFRARED cameras and evaluated with image comparison
  • Scanning though infrared cameras



  • Reliable process validation beforehand in the FRIMO TechCenter
  • Contact-free process
  • Plastification of complex, three-dimensional contours
  • Higher strengths
  • Particle purity
  • Absolutely air and gas impermeable
  • Joining of different materials, e. g. TPE with PP GF 30
  • Simple machine technology, large parameter window
  • Wide range of IR machines
  • All types of tooling and emitters
  • Numerous references
  • Extensive know-how for all joining processes

Infrared Welding DOWNLOADS

Joining/Gluing Technology Brochure

A permanent bond with FRIMO.

FRIMO: Infrared Welding

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