{"id":5369,"date":"2026-09-25T06:59:49","date_gmt":"2026-09-25T14:59:49","guid":{"rendered":"https:\/\/dez-smt.com\/?p=5369"},"modified":"2026-10-07T09:15:59","modified_gmt":"2026-10-07T17:15:59","slug":"solder-paste-printing-defects-unclean-pcb-surface","status":"publish","type":"post","link":"https:\/\/dez-smt.com\/ja\/solder-paste-printing-defects-unclean-pcb-surface\/","title":{"rendered":"\u4e0d\u6e05\u6f54\u306aPCB\u8868\u9762\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u308b\u306f\u3093\u3060\u30da\u30fc\u30b9\u30c8\u5370\u5237\u6b20\u9665"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">An unclean PCB surface can cause solder paste printing defects when dust, fibres, routing debris or other loose particles interfere with stencil-to-board gasketing, obstruct part of a solder pad or transfer onto the stencil underside.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The resulting print may show insufficient paste, irregular deposit edges, smearing, excessive paste or wet bridging between adjacent pads. However, these defect signatures are not exclusive to PCB contamination. Stencil condition, board support, alignment, aperture design, solder paste rheology, squeegee pressure and separation settings can produce similar results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The correct approach is therefore to connect the observed defect to its physical mechanism, verify it before reflow and then apply the appropriate corrective action.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#how-pcb-surface-contamination-affects-solder-paste-printing\">How PCB Surface Contamination Affects Solder Paste Printing<\/a><\/li><li><a href=\"#poor-gasketing-smearing-and-wet-bridging\">Poor Gasketing, Smearing and Wet Bridging<\/a><\/li><li><a href=\"#insufficient-and-incomplete-solder-paste-deposits\">Insufficient and Incomplete Solder Paste Deposits<\/a><\/li><li><a href=\"#is-the-pcb-surface-really-the-root-cause\">Is the PCB Surface Really the Root Cause?<\/a><\/li><li><a href=\"#verify-the-defect-before-reflow\">Verify the Defect Before Reflow<\/a><\/li><li><a href=\"#which-surface-contaminants-can-be-removed-before-printing\">Which Surface Contaminants Can Be Removed Before Printing?<\/a><\/li><li><a href=\"#pcb-cleaning-before-solder-paste-printing\">PCB Cleaning Before Solder Paste Printing<\/a><\/li><li><a href=\"#double-sided-pcb-cleaning-machine-dez-c753s\">Double-Sided PCB Cleaning Machine \u2013 DEZ-C753S<\/a><\/li><li><a href=\"#what-pcb-surface-cleaning-cannot-correct\">What PCB Surface Cleaning Cannot Correct<\/a><\/li><li><a href=\"#frequently-asked-questions\">Frequently Asked Questions<\/a><ul><li><a href=\"#can-dust-on-a-pcb-cause-solder-paste-bridging\">Can dust on a PCB cause solder paste bridging?<\/a><\/li><li><a href=\"#can-pcb-contamination-cause-insufficient-solder-paste\">Can PCB contamination cause insufficient solder paste?<\/a><\/li><li><a href=\"#should-every-pcb-be-cleaned-before-solder-paste-printing\">Should every PCB be cleaned before solder paste printing?<\/a><\/li><li><a href=\"#is-compressed-air-blowing-sufficient\">Is compressed-air blowing sufficient?<\/a><\/li><li><a href=\"#does-the-dez-c753s-remove-flux-residue-or-ionic-contamination\">Does the DEZ-C753S remove flux residue or ionic contamination?<\/a><\/li><\/ul><\/li><li><a href=\"#control-the-cause-not-only-the-defect\">Control the Cause, Not Only the Defect<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 id=\"how-pcb-surface-contamination-affects-solder-paste-printing\" class=\"wp-block-heading\"><strong>How PCB Surface Contamination Affects Solder Paste Printing<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">During stencil printing, the PCB is supported beneath the stencil and raised into contact with it. The stencil should gasket against the board around each aperture so that the solder paste is deposited only onto the intended pad area.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Loose contamination changes this interface.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Contamination mechanism<\/th><th>Effect at the print interface<\/th><th>Possible print defect<\/th><th>Appropriate response<\/th><\/tr><tr><td>A particle is trapped between the stencil and PCB<\/td><td>The stencil is lifted locally and cannot gasket against the solder mask or pad<\/td><td>Smeared deposit, excessive paste, poor edge definition or a wet bridge<\/td><td>Remove loose particles before printing and confirm board flatness and support<\/td><\/tr><tr><td>A particle covers part of a solder pad<\/td><td>Part of the intended deposit cannot contact the pad correctly<\/td><td>Reduced paste area, irregular deposit or locally insufficient paste<\/td><td>Inspect and clean the incoming PCB before another print<\/td><\/tr><tr><td>A particle reaches a stencil aperture<\/td><td>Paste filling or aperture release becomes inconsistent<\/td><td>Incomplete deposit, missing paste or deposit-volume variation<\/td><td>Inspect the aperture and stencil underside; clean the PCB and stencil as required<\/td><\/tr><tr><td>Contamination transfers from the PCB to the stencil underside<\/td><td>The contamination affects subsequent boards, even if the original dirty PCB has left the printer<\/td><td>Repeated smearing, bridging or deposits outside the pad area<\/td><td>Control incoming PCB cleanliness and under-stencil cleaning<\/td><\/tr><tr><td>Static attracts new particles after handling or loading<\/td><td>A cleaned surface becomes recontaminated before printing<\/td><td>Intermittent defects that vary between boards<\/td><td>Reduce static before particle removal and minimise uncontrolled handling<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Contamination or residue on the stencil underside can interfere with gasketing and lead to solder paste in unintended areas or insufficient paste where it is required. It also identifies board coplanarity, solder-mask thickness, alignment and stencil condition as separate variables that can produce similar printing problems.<\/p>\n\n\n\n<div class=\"wp-block-greenshift-blocks-image gspb_image gspb_image-id-gsbp-4bf86dc\" id=\"gspb_image-id-gsbp-4bf86dc\"><img decoding=\"async\" src=\"https:\/\/dez-smt.com\/wp-content\/uploads\/2026\/10\/How-PCB-Surface-Contamination-Affects-Solder-Paste-Printing.gif\" data-src=\"\" alt=\"\" loading=\"lazy\" width=\"640\" height=\"475\"><\/div>\n\n\n\n<h2 id=\"poor-gasketing-smearing-and-wet-bridging\" class=\"wp-block-heading\"><strong>Poor Gasketing, Smearing and Wet Bridging<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Poor gasketing means that the stencil does not make effective contact with the PCB around the aperture being printed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When a particle creates a local gap, solder paste can spread beneath the stencil instead of remaining within the aperture boundary. The deposit may have an enlarged base, a smeared edge or a thin paste trail extending towards an adjacent pad. If paste connects two deposits before reflow, this is a wet bridge.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After reflow, the same condition may become a solder bridge or produce solder balls, but a post-reflow bridge alone does not prove that the original cause was PCB contamination.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under-stencil paste produces a similar mechanism. PCEA reports that paste left on the contact side of the stencil prevents effective gasketing and is frequently associated with excessive deposits, solder bridges and solder balls.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This creates an important diagnostic distinction:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A particle arriving on an incoming PCB can initiate the problem.<\/li>\n\n\n\n<li>Paste or contamination retained on the stencil underside can then carry the problem into subsequent print cycles.<\/li>\n\n\n\n<li>Increasing the stencil-wipe frequency may control the secondary contamination but does not remove the original particle source.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">PCB cleaning and under-stencil cleaning therefore control different parts of the same print interface.<\/p>\n\n\n\n<h2 id=\"insufficient-and-incomplete-solder-paste-deposits\" class=\"wp-block-heading\"><strong>Insufficient and Incomplete Solder Paste Deposits<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A contaminated PCB does not always produce excessive paste. A particle positioned over a pad can reduce the available contact area or disturb paste release as the PCB separates from the stencil.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The SPI result may show:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduced deposit area<\/li>\n\n\n\n<li>Low paste volume<\/li>\n\n\n\n<li>Irregular deposit height<\/li>\n\n\n\n<li>A partially missing deposit<\/li>\n\n\n\n<li>Unstable transfer efficiency between consecutive boards<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Transfer efficiency is the percentage of the aperture volume transferred onto the PCB. Low or unstable transfer efficiency may also result from an unsuitable area ratio, blocked apertures, worn stencil walls, incorrect solder paste condition or separation behaviour. It should not automatically be attributed to PCB contamination.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Solder paste quantity matters because excessive paste can contribute to shorts, while insufficient paste can reduce the electrical or mechanical integrity of the solder joint.<\/p>\n\n\n\n<h2 id=\"is-the-pcb-surface-really-the-root-cause\" class=\"wp-block-heading\"><strong>Is the PCB Surface Really the Root Cause?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The visual appearance of the defect is not enough. Use the defect pattern to decide what to inspect next.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Observed pattern<\/th><th>First checks<\/th><th>Diagnostic interpretation<\/th><\/tr><tr><td>Defect appears randomly and changes position between boards<\/td><td>Incoming PCB surface, packaging fibres, loader, conveyor and production environment<\/td><td>Loose contamination is a credible cause<\/td><\/tr><tr><td>Every PCB shows the same defect at the same pad<\/td><td>Stencil aperture, pad design, board support, alignment and local board flatness<\/td><td>A repeatable tooling or process condition is more likely<\/td><\/tr><tr><td>Smearing or bridging becomes worse over consecutive prints<\/td><td>Stencil underside, wipe interval and contamination transferred from previous boards<\/td><td>Progressive under-stencil contamination is likely<\/td><\/tr><tr><td>Defect appears immediately after an under-stencil wipe<\/td><td>Stencil dryness, wipe media, solvent compatibility and vacuum cycle<\/td><td>The cleaning cycle itself may be affecting the next print<\/td><\/tr><tr><td>SPI results are acceptable but bridging, dewetting or solder balls appear after reflow<\/td><td>Placement, paste slump, solderability, oxidation and reflow profile<\/td><td>Do not classify it as a PCB-surface print defect without further evidence<\/td><\/tr><tr><td>Cleaned and uncleaned boards produce the same SPI distribution<\/td><td>Stencil, paste, printer, support and PCB dimensional conditions<\/td><td>Surface-particle removal is unlikely to be the main corrective action<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These patterns are diagnostic clues, not acceptance criteria. The conclusion should come from controlled comparison rather than visual assumption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AIM\u2019s printing guidance also identifies substrate flatness, board support, separation behaviour, print speed and squeegee pressure as variables that affect paste release and print definition.<\/p>\n\n\n\n<h2 id=\"verify-the-defect-before-reflow\" class=\"wp-block-heading\"><strong>Verify the Defect Before Reflow<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The most direct way to separate a printing problem from a reflow problem is to inspect the solder paste deposit immediately after printing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A 2D inspection can evaluate paste coverage, offset and bridging between pads. A 3D SPI system can additionally measure deposit height and volume. IPC technical work identifies area, height, volume and bridge detection as important measurements for evaluating the solder paste printing process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A practical verification trial should use PCB samples from the same incoming lot:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Divide the samples into cleaned and uncleaned groups.<\/li>\n\n\n\n<li>Keep the stencil, solder paste, printer programme, board support, squeegee and separation settings unchanged.<\/li>\n\n\n\n<li>Inspect both groups with the same SPI programme.<\/li>\n\n\n\n<li>Compare deposit area, height, volume, offset and bridge alarms.<\/li>\n\n\n\n<li>Record whether defects remain at fixed locations or move between boards.<\/li>\n\n\n\n<li>Inspect the stencil underside during the trial for transferred particles or paste smearing.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">The trial should use enough boards to reveal repeatability. One visually acceptable print does not demonstrate stable process control.<\/p>\n\n\n\n<h2 id=\"which-surface-contaminants-can-be-removed-before-printing\" class=\"wp-block-heading\"><strong>Which Surface Contaminants Can Be Removed Before Printing?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dry PCB surface cleaning is suitable for loose contamination such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dust<\/li>\n\n\n\n<li>Fibres and hair<\/li>\n\n\n\n<li>Packaging debris<\/li>\n\n\n\n<li>Routing or depanelisation particles<\/li>\n\n\n\n<li>Loose solder-mask or substrate particles<\/li>\n\n\n\n<li>Static-attracted foreign object debris<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These contaminants can usually be loosened, extracted or collected without introducing a liquid washing process before printing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Oil films, fingerprints, adhesive residue, oxidation and ionic contamination require separate evaluation. A dry particle-cleaning machine should not be presented as a universal method for restoring solderability or chemical cleanliness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Visible cleanliness also does not prove ionic cleanliness. Ionic contamination requires a specified test method and acceptance criterion.<\/p>\n\n\n\n<h2 id=\"pcb-cleaning-before-solder-paste-printing\" class=\"wp-block-heading\"><strong>PCB Cleaning Before Solder Paste Printing<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When loose surface particles are confirmed as a print-process variable, install the cleaning stage immediately before the solder paste printer. This reduces the opportunity for the PCB to be recontaminated after cleaning.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A typical line arrangement is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PCB Loader \u2192 PCB Cleaning Machine \u2192 Solder Paste Printer \u2192 SPI \u2192 Pick-and-Place \u2192 Reflow Oven<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The cleaning process should do more than relocate particles with uncontrolled compressed air. It should reduce static, loosen contamination and capture the released material so that it is not deposited elsewhere on the board or production line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a complete explanation of the process, see <a href=\"https:\/\/dez-smt.com\/applications\/pcb-surface-cleaning\/\">PCB surface cleaning before solder paste printing<\/a>.<\/p>\n\n\n\n<h2 id=\"double-sided-pcb-cleaning-machine-dez-c753s\" class=\"wp-block-heading\"><strong>Double-Sided PCB Cleaning Machine \u2013 DEZ-C753S<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/dez-smt.com\/product\/pcb-cleaning-machine-with-double-sided-cleaning\/\">DEZ-C753S double-sided PCB cleaning machine<\/a> is designed for bare or unpopulated PCBs before solder paste printing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three cleaning brushes loosen dust, fibres and loose particles. Ionised air reduces static that can retain contamination, two vacuum sections extract released particles, and front and rear tacky rollers collect remaining debris.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Process requirement<\/th><th>DEZ-C753S<\/th><\/tr><tr><td>Workpiece<\/td><td>Bare or unpopulated PCB<\/td><\/tr><tr><td>Cleaning method<\/td><td>Automatic inline, double-sided dry cleaning<\/td><\/tr><tr><td>PCB dimensions<\/td><td>50 \u00d7 50\u2013350 \u00d7 350 mm<\/td><\/tr><tr><td>PCB thickness<\/td><td>0.4\u20133 mm<\/td><\/tr><tr><td>Conveyor height<\/td><td>900 \u00b125 mm<\/td><\/tr><tr><td>Cleaning brushes<\/td><td>3 brushes<\/td><\/tr><tr><td>Vacuum extraction<\/td><td>2 sets<\/td><\/tr><tr><td>Particle collection<\/td><td>Front and rear tacky rollers<\/td><\/tr><tr><td>Static control<\/td><td>Built in<\/td><\/tr><tr><td>Air supply<\/td><td>0.4\u20130.5 MPa<\/td><\/tr><tr><td>Power supply<\/td><td>AC 220 V, 50 Hz<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The complete equipment range is available under <a href=\"https:\/\/dez-smt.com\/pcb-cleaning-machine\/\">PCB cleaning machines<\/a>.<\/p>\n\n\n\n<h2 id=\"what-pcb-surface-cleaning-cannot-correct\" class=\"wp-block-heading\">What PCB Surface Cleaning Cannot Correct<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pre-print PCB cleaning is the correct response only when removable surface contamination is part of the confirmed root cause.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If dried solder paste is blocking the stencil, investigate the stencil-cleaning process rather than adding more PCB cleaning. See <a href=\"https:\/\/dez-smt.com\/how-to-prevent-blocked-smt-stencil-apertures\/\">how to prevent blocked SMT stencil apertures<\/a>.<\/p>\n\n\n\n<h2 id=\"frequently-asked-questions\" class=\"wp-block-heading\"><strong>Frequently Asked Questions<\/strong><\/h2>\n\n\n\n<h3 id=\"can-dust-on-a-pcb-cause-solder-paste-bridging\" class=\"wp-block-heading\">Can dust on a PCB cause solder paste bridging?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, if a particle prevents the stencil from gasketing against the PCB, solder paste may spread beneath the stencil and towards an adjacent pad. Bridging can also result from stencil contamination, misalignment, excessive paste, poor support or unsuitable printing parameters, so the root cause must be verified.<\/p>\n\n\n\n<h3 id=\"can-pcb-contamination-cause-insufficient-solder-paste\" class=\"wp-block-heading\">Can PCB contamination cause insufficient solder paste?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. A particle can occupy part of a pad, interfere with stencil contact or contribute to contamination around an aperture. The result may be reduced deposit area or volume. Repeated low volume at the same location, however, is more likely to indicate an aperture, stencil-design or support problem.<\/p>\n\n\n\n<h3 id=\"should-every-pcb-be-cleaned-before-solder-paste-printing\" class=\"wp-block-heading\">Should every PCB be cleaned before solder paste printing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not automatically. The decision should be based on incoming-board cleanliness, packaging and handling conditions, particle sources, product geometry and measured print performance. Inline cleaning is appropriate when loose contamination is a recurring or controlled process risk.<\/p>\n\n\n\n<h3 id=\"is-compressed-air-blowing-sufficient\" class=\"wp-block-heading\">Is compressed-air blowing sufficient?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Airflow may move loose contamination without capturing it and may redistribute particles onto another part of the PCB or production equipment. A controlled cleaning process should combine particle release with extraction or collection.<\/p>\n\n\n\n<h3 id=\"does-the-dez-c753s-remove-flux-residue-or-ionic-contamination\" class=\"wp-block-heading\">Does the DEZ-C753S remove flux residue or ionic contamination?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The DEZ-C753S removes dry loose contamination from bare PCBs before printing. Flux residue on an assembled PCBA and defined ionic-cleanliness requirements require a different cleaning and verification process.<\/p>\n\n\n\n<h2 id=\"control-the-cause-not-only-the-defect\" class=\"wp-block-heading\"><strong>Control the Cause, Not Only the Defect<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An unclean PCB surface can disturb solder paste printing, but the defect should be traced through the print interface rather than inferred from its appearance after reflow.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect the incoming PCB, stencil underside and paste deposit together. Use SPI and controlled comparison to determine whether the defect follows the PCB, remains at a fixed aperture or develops over consecutive print cycles. Once loose surface contamination is confirmed, an inline cleaning process can remove that variable before the PCB reaches the printer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Send DEZ your PCB dimensions, thickness, contamination samples, conveyor direction and current line configuration to evaluate the DEZ-C753S for your SMT printing process.<\/p>\n\n\n<style id=\"wpforms-css-vars-95-block-90922808-6ffa-46c9-8831-3937ffc51040\">\n\t\t\t\t#wpforms-95.wpforms-block-90922808-6ffa-46c9-8831-3937ffc51040 {\n\t\t\t\t--wpforms-label-color: var(--theme-palette-color-8, #ffffff);\n--wpforms-button-background-color: var(--theme-palette-color-1, #36b37e);\n--wpforms-background-color: rgba(0, 0, 0, 0);\n--wpforms-field-size-input-height: 43px;\n--wpforms-field-size-input-spacing: 15px;\n--wpforms-field-size-font-size: 16px;\n--wpforms-field-size-line-height: 19px;\n--wpforms-field-size-padding-h: 14px;\n--wpforms-field-size-checkbox-size: 16px;\n--wpforms-field-size-sublabel-spacing: 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