RE-WORK STENCILS ASSURE SINGLE SHOT SUCCESS

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RE-WORK STENCILS ASSURE SINGLE SHOT SUCCESS
30 June 2002 - Tecan

Mini Rework Stencils, designed and manufactured by Tecan, guarantee accurate and repeatable printed results for components such as, QFP's, PLCC's, BGA's, uBGA's and SM connectors when replaced during PCB rework operations.

Rework Stencils mimic the footprints and aperture sizes corresponding to both the device and the major stencil used in the original production. In combination with a rework station, alignment is simple, resulting in a controlled right first time process. Designed to ensure optimum reliability and consistent printed results, their strength and rigidity ensure positive gasketting with the PCB surface. Their minimum footprints can be used in all situations, especially where the density of components offers the smallest access area.

In operation the stencil is accurately aligned over the 'cleaned' pads and the paste is deposited using the tailored mini squeegee blade provided. The stencil design is optimised to deliver the required volume of paste, with the folded edges providing effective paste containment, the replacement part is then placed and locally reflowed. The stencils are supplied as complete assemblies with all necessary interfaces to suit existing rework stations and systems. Accurately folded edges and run-on/run-off areas ensure effective paste roll without causing interference with other components on the populated PCB.

Other rework options from the company include dip-transfer plates for BGA fluxing, 'nest' plates for direct printing onto BGA terminations and thicker stencils for re-balling BGA's. Reflow reflector shields are also available to protect susceptible neighbouring components from thermal shock. The stainless steel stencils are precision etched to ensure the accuracy necessary for the finest apertures sizes on today's devices.

A comprehensive explanatory CD, covering all rework requirements and solutions is available on request to qualifying engineers.

http://www.tecan.co.uk

About: Tecan
Tecan is a world-class, ISO 9001:2000 registered precision metal part and tool manufacturer, based in Weymouth, UK. Formed in 1970, Tecan offers the 'total' one-stop contract-manufacturing solution - from technology development through to rapid prototyping and volume production.

Tecan's team of experienced engineers work closely with the customer to develop manufacturing solutions to meet their exact cost and tolerance requirements. Years of process development have culminated in Tecan being able to cost-effectively manufacture metal parts with feature sizes down to 2-micron at sub-micron accuracy - and to put that into perspective, there are 1,000-microns to one millimetre.

Technological innovation and expertise form the basis of Tecan's success, and have provided the platform for the development of competences in several process technologies, including:

• Photo Chemical Machining (PCM)
• Photo ElectroForming (PEF)
• Precision photolithography
• Precision electroplating

Tecan works on a global basis with a diverse range of OEM customers, who are involved in a wide array of industries. The nature of Tecan's competences, combined with its commitment to R&D, allows it to stretch to meet the requirements of virtually any application.

More News:
  • For June 2002
  • From Tecan
  • For Photochemical Machining (PCM)