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FRAMED MULTI-LEVEL / STEP STENCILS | ||||||||||||||||
These Multi-level Stencils offer superior flexibility in achieving the right solder paste volume deposit for components with diverse paste requirement.
OVERVIEWMulti-Level Stencils also known as step stencils are the solution for the new electronic assemblies which include mixed technology applications like fine pitch technology with through-hole and SMT technologies. This mix requires different amounts of solder paste for different parts. Multi-Level Stencils can provide additional paste height in selected areas of the PCB (step-up) or reduced height deposits in other areas (step-down) in a specific section of the board. SOME OF THE BIGGEST PROBLEMS THAT MULTI-LEVEL STENCILS
STEP-UP AREASUsed to increase the volume and height of the solder deposit. Useful for ‘pin in paste’ and large format devices with co planarity consistency problems. STEP-DOWN AREASUsed to reduce the volume and height of the paste deposit (or possibly increase the volume depending on aperture area ratio and transfer efficiency). Useful to improve Deposit Volume Repeatability in fine line and micro package attachment. "STEPLESS" STEPSRamped step-up areas, produced by the electroforming process, to increase paste deposits in selected areas of the stencil for large components or large features such as antenna’s or shieldings. Formed on the PCB side of the stencil to provide a smooth print surface for enclosed printheads etc while minimising smearing. STEP-RELIEF CAVITIESUsed to overcome board surface irregularities such as raised pads, vias, legends such as bar codes and edge clamping issues. These features also afford relief for paste print deposits in two step stencil printing processes… where the use of a thin stencil is followed up by a thicker stencil in order to achieve multi height deposits without the need for "keep out areas".
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I.C.T is a manufacturer of SMT machines. It mainly provides customers with SMT production lines including SMT Stencil Printers, Pick and place machines, Reflow Oven, AOI Machine, Wave Soldering Machine and PCB Handling Machine etc. I.C.T has more than 25 researches on SMT and DIP technology, for the world Customers provide SMT total solutions. There are successful cases of SMT technical team in Asia, Europe, America, Africa, and Australia. I.C.T provide SMT solutions at various stages according to the different needs of customers. I.C.T is not only a provider of SMT equipment and technology, but also is the customer's escort in the field of SMT and DIP. Welcome more people to discuss with us about SMT technologies and solutions, please contact us for more information: Tel: +86 13670124230 (WhatsApp/Skype/WeChat) Email: etasmt@foxmail.com
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文章From:http://www.suneastsmt.com/te_news_industry/2021-09-16/30763.chtml |