Personal tools

Skip to content. | Skip to navigation

Sections
  • Tooling

Tooling

The metal foil used in Branson emitters operates with an emission spectrum of a medium to long wave range (λ = 2.0..8.0 μm) and therefore perfectly covers the optical characteristics of all frequently used plastics. Whilst laser transmission welding is based on the absorption effect of special pigments, the infrared emitters that are used in this process are capable of heating unfilled, reinforced or even coloured formulations.

Broad-band metal-foil emitter – very robust and energy-efficient

The metal foil used in Branson emitters operates with an emission spectrum of a medium to long wave range (λ = 2.0..8.0 μm) and therefore perfectly covers the optical characteristics of all frequently used plastics. Whilst laser transmission welding is based on the absorption effect of special pigments, the infrared emitters that are used in this process are capable of heating unfilled, reinforced or even coloured formulations.

This ensures not only that a non-contact and uniform energy supply to the joint zone, it also provides an effective and efficient heating, melting and welding process. The usual drawbacks of established contact heating methods are eliminated, for example adherence of the melted material to the hotplate, unwanted stray emission, as well as tooling and repair periods due to abrasion of the anti-sticking coating.

In contrast to conventional halogen radiators, different types of metal-foil emitters provide highly flexible and extremely good resistance against mechanical loads. They are not encased in any kind of housing, but mounted in ceramic supports and aligned exactly following the welding contour. In a contour aligned ceramic, the metal-foil emitters are exactly adapted to the profile of the weld seam. The welding machine individually supplies and controls each heating circuit. Adapted emitter design and narrow part tolerances enable a precise heating and melting of the joint zone; a millimeter distance is feasible, even for three-dimensional parting lines. There is no additional cost for masking of the heat-sensitive components or for cooling of the tool unit as with other processes.

Files