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Heating and melting during radiation welding of plastics via broad-band infrared emitters are based upon the absorption of non-reflected radiation energy by the polymer matrix and the fillers contained therein.

Infrared welding – highly efficient and cost-reducing 

Heating and melting during radiation welding of plastics via broad-band infrared emitters are based upon the absorption of non-reflected radiation energy by the polymer matrix and the fillers contained therein. 

Due to the specific resonance frequency of valence and deformation vibrations depending on the molecular structure of the respective plastic material exposed to radiation, typical wavelength bands give a high transmission or absorption result. This is why common thermoplastics based on [CH]n-groups show characteristic so-called absorption bands around λ = 3.4 μm. In addition, there are individual ranges of 2..3 μm and 6..8 μm.

IR Welding Advantages

  • Low maintenance
  • No contact to part surface
  • Eliminates plastic sticking to tooling
  • Immediate start-up
  • More accurate part temperature control
  • Clean welding area
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