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Precision Stencils

Laser-cut precision stencils are the standard for the perfect application of solder or printing pastes, adhesives, etc. on rigid or flexible circuit boards and on other surfaces such as silicon wafers (wafer bumping), glass or ceramic substrates (LTCC).
Electronic components such as microchips, SMD components, contact elements or other semiconductor components are then automatically placed in the pre-printed pads with precisely defined volumes and thermally fused. This technology is also used in flip chip assembly.

Precision stencils from KMLT® are available in all common formats, electropolished for demanding applications and also with nano-coating.

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  • Laser-cut metal stencils are required in the industrial production of electronic assemblies for applying solder paste to printed circuit boards.

  • Depending on the customer's technical requirements, these are usually manufactured as a frameless sheet with perforations for a quick clamping system.

  • In general, every SMD stencil produced is brushed before delivery and subjected to an optical quality check on a scanner.

Electropolishing

The system is also used to electropolish flat, small and very small components. The prerequisite for this is production in the panel, as the material must be available in sheet or foil format for treatment in the polishing system. The surface of an anodically connected workpiece is removed under the influence of DC and electrolyte, particularly at the tips and edges. This results in a leveling of the micro-roughness and the finest deburring. Passivity and corrosion resistance are retained.

More information can be found here: Additional services

  • For demanding SMD stencils or high-precision masks and stencils, KMLT® recommends electropolishing for surface optimization.

  • Electropolishing minimizes the roughness within the pad walls, which significantly improves the release of the solder paste.

  • The result is extremely smooth and burr-free surfaces that are much easier to clean at longer intervals.

Stencils for quick clamping systems

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The scope of delivery includes license-free perforations for all common quick-release systems:

  • Alpha Tetra / DEK-Vector_FM_SS308
  • Mechatronics
  • Quatroflex
  • VectorGuard™
  • ZelFlex

In addition to stencil plates made of stainless steel 1.4301, VectorGuard stencils can also be made of FineGrain material.

  • To protect against lacerations, the frameless, perforated template can be fitted with edge protection on request.

  • The sides of the template are folded by 180°. At the same time, the thin sheet is additionally stabilized.

  • This is possible with sheets up to 150 µm thickness.

XXL-Stencils

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  • In modern LED / OLED technology new areas of application are emerging that also require such special formats in SMD technology.

  • XXL or large-format stencils of this type are supplied by us fully assembled in distortion-free aluminum frames.