SMT_PNG_full

By Pär Gester, SMT Express

An ESD protected area, ESDPA or just EPA, is an area set up in a facility that is protected from the effects of static electricity. Exclusion of static generating material is crucial to maintain an EPA. No object should be brought into the EPA that can tribocharge and discharge rapidly.

Companies takes this seriously by using ESD safe tools, grounding work surfaces and having staff use special shoes and garment.

However, there is one strange exception to these precautions; the SMT stencil cleaning roll. 

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Standard  fabric catastrophic performance Standard fabric catastrophic performance

By Pär Gester, SMT Express

The fabric in SMT stencil cleaning rolls must have a so called high coverage. Otherwise, the fabric will have areas where the density is either to high or to low to perform well. This short article shows why.

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By Pär Gester, SMT Express

If your DEK printer is equipped with a nylon bracket for the stencil roll, you need a Hyperclean roll with smaller core diameter. Hyperclean PP4200 is also sold as DEK UFP-ECO and Scanditron Stencil Roll

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Solder balls trapped in Hyperclean Solder balls trapped in Hyperclean

By Pär Gester, SMT Express

Solder paste screenprinting is known to be one of the most difficult processes to quality assure in Printed Board Assembly (PBA) manufacturing. An important process step in solder paste screenprinting is the under stencil cleaning process and one of the key materials in this process is the cleaning fabric.  This IPC report describes how cleaning fabrics can be tested and it also tells how big differences it can be between different materials.

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