Stencil Cleaning & Misprinted PCB Cleaners

Most solder defects, some estimate up to 70%, can be attributed to the stencil printing process.  KYZEN can improve your stencil cleaning efficiency with our specially formulated stencil cleaners, which will improve process yields.
Kyzen-stencil-cleaning-fluid-designed

 

Why is stencil cleaning becoming more critical?

As miniaturization drives electronic component size ever smaller, the more important it has become that solder paste deposits and volume transfer are consistent and reproducible from board to board in the printing process. A number of factors can negatively affect these important attributes.  For example, proper solder paste transfer efficiency is especially critical for small pad features, because it reduces defects due to poor solder joints. In this case, solder paste builds up onto the aperture walls and bottom side of the stencil over time leading to insufficient or inconsistent transfer onto the pads.  Periodic cleaning of the built up paste with a KYZEN stencil cleaning fluid designed for your application will improve print quality and process yield.

Selecting the right stencil cleaning agent or stencil cleaner

Choosing the best stencil cleaning agent or stencil cleaner is a function of matching the right KYZEN material to your stencil cleaning method and your stencil cleaning equipment.

Stencil Cleaning Methods:

  • Understencil Wipe
  • Hand Wipe
  • Hand Held Ultrasonic Transducer
  • Ultrasonic Immersion / Water Rinse
  • Ultrasonic Immersion / Filtered Cleaning Agent Rinse
  • Spray-in-Air Solvent Wash / Solvent Rinse
  • Spray-in-Air Aqueous Wash / Water Rinse
  • Spray-in-Air Aqueous Wash / Cleaning Agent Rinse

Stencil Cleaning Agent Guide

KYZEN’s array of stencil cleaning products is specifically formulated for all common stencil cleaning methods.  The table below simplifies the selection process by matching the stencil cleaning agent to the process.

Stencil Cleaning Agent Guide Chart



Processes

Understencil Wiping for Electronics Assembly Manufacturing
The understencil wipe process begins with a roll of fibrousmaterial that is used, as the name implies, for wiping across the underside of the stencil and removing soils.
Ultrasonics
Ultrasonic stencil cleaning is one of the preferred methods for removing trace levels of solder paste from stencil openings.
Cybersolve C8882® Solvent-Based Stencil Cleaning Fluid
Cybersolv® C8882 is a solvent-based stencil cleaning fluid specifically designed to clean wet solder paste, SMT adhesive and flux residue from stencils (conventional and plastic pump), mis-printed PCBs, wave soldering pallets and tools, fixtures and squeegees.
Spray-In-Air Aqueous Wash / Water Rinse
The desirable properties of a stencil cleaning agent are (1) the ability to rapidly dissolve the solder paste flux vehicle, (2) material compatibility with the nano-coating and equipment, (3) non-flammable, (4) low odor, and (5) rinse with water or cleaning agent.
Hand Held Stencil Cleaning Process
Cleaning the Stencil as it comes from the printer is necessary to remove trace levels of solder paste from the apertures. Automated stencil cleaning machines are highly effective at thoroughly cleaning stencils.
Misprint Cleaning
Misprint cleaning is commonly addressed by either hand wiping the misprinted side of the circuit card and/or cleaning the misprint in a stencil cleaning machine. Cleaning misprinted boards can offer challenges in both methods.

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