{"id":56575,"date":"2026-08-21T11:53:40","date_gmt":"2026-08-21T09:53:40","guid":{"rendered":"https:\/\/smans.com\/?post_type=knowledgeportal&#038;p=56575"},"modified":"2026-08-21T13:44:32","modified_gmt":"2026-08-21T11:44:32","slug":"scooping-slump-print-gap-et-paste-release-en-impression-par-pochoir","status":"publish","type":"knowledgeportal","link":"https:\/\/smans.com\/fr\/knowledgebase\/scooping-slump-print-gap-et-paste-release-en-impression-par-pochoir\/","title":{"rendered":"Scooping, slump, print gap et paste release en impression par pochoir"},"content":{"rendered":"<div class=\"qMYqUG_convSearchResultHighlightRoot\">\n<div class=\"\" data-turn-id-container=\"request-6a85a90d-9d00-83ed-98cd-22246f8d7dd7-28\" data-is-intersecting=\"true\">\n<section class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a85a90d-9d00-83ed-98cd-22246f8d7dd7-28\" data-turn-id-container=\"request-6a85a90d-9d00-83ed-98cd-22246f8d7dd7-28\" data-testid=\"conversation-turn-48\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-8 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" data-conversation-screenshot-content=\"\">\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"92cb1727-62c3-4abc-9829-1e7ec54c8203\" data-message-model-slug=\"gpt-5-6\" data-turn-start-message=\"true\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\">\n<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"327\" data-end=\"585\">Lors de l\u2019impression par pochoir, la bonne quantit\u00e9 de p\u00e2te \u00e0 braser doit \u00eatre d\u00e9pos\u00e9e au bon endroit. Ce r\u00e9sultat ne d\u00e9pend pas uniquement des r\u00e9glages de l\u2019imprimante. La g\u00e9om\u00e9trie du pochoir et le comportement de la p\u00e2te \u00e0 braser jouent \u00e9galement un r\u00f4le.<\/p>\n<p data-start=\"587\" data-end=\"769\">Quatre notions permettent de mieux comprendre ce processus : <strong data-start=\"648\" data-end=\"695\">scooping, print gap, paste release et slump<\/strong>. Chacune intervient \u00e0 une \u00e9tape diff\u00e9rente pendant ou apr\u00e8s l\u2019impression.<\/p>\n<h2 data-section-id=\"1eyqwau\" data-start=\"771\" data-end=\"801\">Qu\u2019est-ce que le scooping ?<\/h2>\n<p data-start=\"803\" data-end=\"902\">Pendant l\u2019impression, la raclette d\u00e9place la p\u00e2te \u00e0 braser sur le pochoir et remplit les apertures.<\/p>\n<p data-start=\"904\" data-end=\"1197\">La raclette doit exercer une pression suffisante pour remplir les ouvertures tout en laissant la surface du pochoir propre. L\u2019angle de la raclette joue \u00e9galement un r\u00f4le. Un angle d\u2019environ <strong data-start=\"1094\" data-end=\"1101\">60\u00b0<\/strong> offre un compromis entre le remplissage des apertures et le nettoyage de la surface du pochoir.<\/p>\n<p data-start=\"1199\" data-end=\"1378\">En cas de <strong data-start=\"1209\" data-end=\"1221\">scooping<\/strong>, une partie de la p\u00e2te est retir\u00e9e de l\u2019aperture remplie pendant le mouvement de la raclette. La p\u00e2te ne reste donc pas parfaitement plane dans l\u2019ouverture.<\/p>\n<p data-start=\"1380\" data-end=\"1490\">Le r\u00e9glage de la raclette doit avant tout assurer un <strong data-start=\"1433\" data-end=\"1489\">remplissage suffisant et reproductible des apertures<\/strong>.<\/p>\n<h2 data-section-id=\"17zvfw\" data-start=\"1492\" data-end=\"1519\">Que signifie print gap ?<\/h2>\n<p data-start=\"1521\" data-end=\"1602\">Le <strong data-start=\"1524\" data-end=\"1537\">print gap<\/strong> est la distance entre le PCB et le pochoir pendant l\u2019impression.<\/p>\n<p data-start=\"1604\" data-end=\"1798\">Dans la plupart des applications, on utilise un print gap de <strong data-start=\"1665\" data-end=\"1670\">0<\/strong> : le PCB est amen\u00e9 au contact du pochoir. Un l\u00e9ger gap n\u00e9gatif peut \u00e9galement \u00eatre utilis\u00e9 afin d\u2019obtenir une bonne \u00e9tanch\u00e9it\u00e9.<\/p>\n<p data-start=\"1800\" data-end=\"2089\">Si le pochoir et le PCB ne sont pas suffisamment en contact, de la p\u00e2te \u00e0 braser peut s\u2019introduire entre les deux. La p\u00e2te risque alors d\u2019\u00eatre d\u00e9pos\u00e9e en dehors des plages pr\u00e9vues, ce qui peut entra\u00eener des probl\u00e8mes tels que des <strong data-start=\"2030\" data-end=\"2088\">billes de soudure, des ponts de soudure et des bavures<\/strong>.<\/p>\n<p data-start=\"2091\" data-end=\"2208\">Une pression excessive n\u2019est pas souhaitable non plus, car elle peut augmenter l\u2019usure et les contraintes m\u00e9caniques.<\/p>\n<p data-start=\"2210\" data-end=\"2307\">L\u2019objectif est donc d\u2019obtenir <strong data-start=\"2240\" data-end=\"2306\">un contact correct et reproductible entre le PCB et le pochoir<\/strong>.<\/p>\n<h2 data-section-id=\"1byncbc\" data-start=\"2309\" data-end=\"2344\">Qu\u2019est-ce que la paste release ?<\/h2>\n<p data-start=\"2346\" data-end=\"2499\">Apr\u00e8s le passage de la raclette, le PCB et le pochoir sont s\u00e9par\u00e9s. La p\u00e2te \u00e0 braser doit alors se lib\u00e9rer des apertures et rester sur les plages du PCB.<\/p>\n<p data-start=\"2501\" data-end=\"2548\">C\u2019est ce que l\u2019on appelle la <strong data-start=\"2530\" data-end=\"2547\">paste release<\/strong>.<\/p>\n<p data-start=\"2550\" data-end=\"2725\">La <strong data-start=\"2553\" data-end=\"2576\">transfer efficiency<\/strong> est \u00e9galement importante : elle indique dans quelle mesure le volume de p\u00e2te pr\u00e9vu est effectivement transf\u00e9r\u00e9 de l\u2019aperture du pochoir vers le PCB.<\/p>\n<p data-start=\"2727\" data-end=\"2824\">Une bonne paste release devient de plus en plus critique lorsque les apertures sont plus petites.<\/p>\n<h2 data-section-id=\"1010qfi\" data-start=\"2826\" data-end=\"2858\">Quel r\u00f4le joue l\u2019area ratio ?<\/h2>\n<p data-start=\"2860\" data-end=\"3013\">L\u2019<strong data-start=\"2862\" data-end=\"2876\">area ratio<\/strong> permet d\u2019\u00e9valuer l\u2019imprimabilit\u00e9 d\u2019une aperture. Elle tient compte \u00e0 la fois des dimensions de l\u2019ouverture et de l\u2019\u00e9paisseur du pochoir.<\/p>\n<p data-start=\"3015\" data-end=\"3220\">Pour l\u2019impression par pochoir, une valeur d\u2019environ <strong data-start=\"3067\" data-end=\"3126\">0,6 est g\u00e9n\u00e9ralement utilis\u00e9e comme area ratio minimale<\/strong>. En dessous de cette valeur, il devient plus difficile d\u2019obtenir un bon transfert de la p\u00e2te.<\/p>\n<p data-start=\"3222\" data-end=\"3406\">Cet aspect est particuli\u00e8rement important pour les composants et apertures de petite taille. Plus les dimensions diminuent, plus il devient difficile d\u2019obtenir une bonne paste release.<\/p>\n<h2 data-section-id=\"10htjs5\" data-start=\"3408\" data-end=\"3457\">La separation speed influence la paste release<\/h2>\n<p data-start=\"3459\" data-end=\"3559\">La vitesse \u00e0 laquelle le PCB et le pochoir sont s\u00e9par\u00e9s influence \u00e9galement le transfert de la p\u00e2te.<\/p>\n<p data-start=\"3561\" data-end=\"3728\">La <strong data-start=\"3564\" data-end=\"3584\">separation speed<\/strong> est donc un param\u00e8tre important lors de l\u2019impression par pochoir. Le r\u00e9glage appropri\u00e9 d\u00e9pend de la p\u00e2te \u00e0 braser utilis\u00e9e et de l\u2019application.<\/p>\n<p data-start=\"3730\" data-end=\"3819\">L\u2019objectif est d\u2019obtenir un transfert stable de la p\u00e2te depuis les apertures vers le PCB.<\/p>\n<h2 data-section-id=\"fz54kx\" data-start=\"3821\" data-end=\"3848\">Qu\u2019est-ce que le slump ?<\/h2>\n<p data-start=\"3850\" data-end=\"4009\">Apr\u00e8s l\u2019impression, la p\u00e2te \u00e0 braser doit suffisamment conserver sa forme. Le <strong data-start=\"3928\" data-end=\"3937\">slump<\/strong> indique dans quelle mesure un d\u00e9p\u00f4t imprim\u00e9 s\u2019\u00e9tale apr\u00e8s l\u2019impression.<\/p>\n<p data-start=\"4011\" data-end=\"4159\">Ce comportement peut \u00eatre \u00e9valu\u00e9 en imprimant des d\u00e9p\u00f4ts proches les uns des autres, puis en v\u00e9rifiant dans quelle mesure la p\u00e2te conserve sa forme.<\/p>\n<p data-start=\"4161\" data-end=\"4175\">On distingue :<\/p>\n<ul data-start=\"4177\" data-end=\"4334\">\n<li data-section-id=\"o808er\" data-start=\"4177\" data-end=\"4252\"><strong data-start=\"4179\" data-end=\"4195\">Cold slump :<\/strong> stabilit\u00e9 de la forme de la p\u00e2te \u00e0 temp\u00e9rature ambiante.<\/li>\n<li data-section-id=\"i3oj1f\" data-start=\"4253\" data-end=\"4334\"><strong data-start=\"4255\" data-end=\"4270\">Hot slump :<\/strong> stabilit\u00e9 de la forme de la p\u00e2te \u00e0 une temp\u00e9rature plus \u00e9lev\u00e9e.<\/li>\n<\/ul>\n<p data-start=\"4336\" data-end=\"4442\">Une bonne stabilit\u00e9 est importante, car des d\u00e9p\u00f4ts qui s\u2019\u00e9talent peuvent se rapprocher les uns des autres.<\/p>\n<h2 data-section-id=\"hrpasp\" data-start=\"4444\" data-end=\"4500\">Conclusion : identifiez le moment o\u00f9 l\u2019\u00e9cart appara\u00eet<\/h2>\n<p data-start=\"4502\" data-end=\"4601\">Scooping, print gap, paste release et slump d\u00e9crivent diff\u00e9rentes \u00e9tapes du processus d\u2019impression.<\/p>\n<p data-start=\"4603\" data-end=\"4942\">Le <strong data-start=\"4606\" data-end=\"4618\">scooping<\/strong> concerne ce qui se passe pendant le mouvement de la raclette. Le <strong data-start=\"4684\" data-end=\"4697\">print gap<\/strong> influence le contact entre le PCB et le pochoir pendant l\u2019impression. La <strong data-start=\"4771\" data-end=\"4788\">paste release<\/strong> concerne le transfert de la p\u00e2te lorsque le PCB et le pochoir sont s\u00e9par\u00e9s. Le <strong data-start=\"4868\" data-end=\"4877\">slump<\/strong> d\u00e9crit la capacit\u00e9 de la p\u00e2te \u00e0 conserver sa forme par la suite.<\/p>\n<p data-start=\"4944\" data-end=\"5133\">Cette distinction facilite l\u2019analyse d\u2019un r\u00e9sultat d\u2019impression irr\u00e9gulier. <strong data-start=\"5020\" data-end=\"5133\">D\u00e9terminez d\u2019abord \u00e0 quelle \u00e9tape l\u2019\u00e9cart appara\u00eet, puis examinez les param\u00e8tres qui influencent cette \u00e9tape.<\/strong><\/p>\n<p data-start=\"5135\" data-end=\"5300\" data-is-last-node=\"\" data-is-only-node=\"\">Une impression stable de p\u00e2te \u00e0 braser n\u00e9cessite finalement la bonne combinaison entre <strong data-start=\"5222\" data-end=\"5299\">les r\u00e9glages de l\u2019imprimante, la g\u00e9om\u00e9trie du pochoir et la p\u00e2te \u00e0 braser<\/strong>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n","protected":false},"featured_media":56578,"template":"","class_list":["post-56575","knowledgeportal","type-knowledgeportal","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Scooping, slump, print gap et paste release en impression par pochoir - Smans<\/title>\n<meta name=\"description\" content=\"Que signifient scooping, slump, print gap et paste release en impression par pochoir ? 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