{"id":3560,"date":"2025-07-09T08:22:00","date_gmt":"2025-07-09T00:22:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3560"},"modified":"2025-07-08T15:56:17","modified_gmt":"2025-07-08T07:56:17","slug":"how-to-perform-reflow-soldering-on-double-sided-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/","title":{"rendered":"Hur utf\u00f6r man \u00e5terfl\u00f6desl\u00f6dning p\u00e5 dubbelsidigt kretskort?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Inneh\u00e5llsf\u00f6rteckning<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Why_is_Double-Sided_PCB_Reflow_Soldering_a_Challenge_in_Electronics_Manufacturing\" >Varf\u00f6r \u00e4r fl\u00f6desl\u00f6dning av dubbelsidiga kretskort en utmaning inom elektroniktillverkningen?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#In-Depth_Comparison_of_Two_Main_Soldering_Processes\" >Djupg\u00e5ende j\u00e4mf\u00f6relse av tv\u00e5 huvudsakliga l\u00f6dprocesser<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Option_A_Double-Sided_Solder_Paste_Process_Ideal_for_High-Density_Components\" >Alternativ A: Dubbelsidig l\u00f6dpastaprocess (idealisk f\u00f6r komponenter med h\u00f6g densitet)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Option_B_Solder_Paste_Red_Glue_Hybrid_Process_Solution_for_Large_Components\" >Alternativ B: Hybridprocess med l\u00f6dpasta + r\u00f6dlim (l\u00f6sning f\u00f6r stora komponenter)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#5_Golden_Rules_for_Soldering_Quality_Control\" >5 gyllene regler f\u00f6r kvalitetskontroll av l\u00f6dning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Common_Issues_and_Engineering_Solutions\" >Vanliga problem och tekniska l\u00f6sningar<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Future_Process_Trends\" >Framtida processtrender<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_is_Double-Sided_PCB_Reflow_Soldering_a_Challenge_in_Electronics_Manufacturing\"><\/span>Varf\u00f6r \u00e4r fl\u00f6desl\u00f6dning av dubbelsidiga kretskort en utmaning inom elektroniktillverkningen?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>I h\u00f6gpresterande elektroniska produkter, t.ex. smartphones och industriella styrenheter, <a href=\"https:\/\/www.topfastpcb.com\/sv\/products\/double-sided-flexible-pcb\/\">dubbelsidig PCB<\/a> har blivit standard. Dubbelsidig l\u00f6dning inneb\u00e4r dock tv\u00e5 stora utmaningar:<\/p><ol class=\"wp-block-list\"><li><strong>Komplexitet vid v\u00e4rmehantering<\/strong> - Under l\u00f6dningen p\u00e5 den andra sidan v\u00e4rms den f\u00f6rsta sidan upp, vilket kan leda till att komponenter lossnar eller att l\u00f6dfogen g\u00e5r s\u00f6nder.<\/li>\n\n<li><strong>Dilemma vid val av process<\/strong> - Processerna med lodpasta och r\u00f6tt lim har alla sina f\u00f6r- och nackdelar och kr\u00e4ver noggrant \u00f6verv\u00e4gande baserat p\u00e5 komponentlayouten.<\/li><\/ol><p><a href=\"https:\/\/www.topfastpcb.com\/sv\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kontakta v\u00e5ra processingenj\u00f6rer<\/a>\u00a0f\u00f6r kundanpassade l\u00f6sningar<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb.jpg\" alt=\"\u00c5terfl\u00f6desl\u00f6dning av PCB\" class=\"wp-image-3561\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"In-Depth_Comparison_of_Two_Main_Soldering_Processes\"><\/span>Djupg\u00e5ende j\u00e4mf\u00f6relse av tv\u00e5 huvudsakliga l\u00f6dprocesser<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Option_A_Double-Sided_Solder_Paste_Process_Ideal_for_High-Density_Components\"><\/span>Alternativ A: Dubbelsidig l\u00f6dpastaprocess (idealisk f\u00f6r komponenter med h\u00f6g densitet)<span class=\"ez-toc-section-end\"><\/span><\/h3><p><strong>B\u00e4st f\u00f6r<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Kretskort med BGA, QFN eller andra precisions-IC p\u00e5 b\u00e5da sidor<\/li>\n\n<li>L\u00e4ttviktskomponenter \u00f6verlag<\/li><\/ul><p><strong>Viktiga steg<\/strong>:<\/p><ol class=\"wp-block-list\"><li>Sida A: Tryck l\u00f6dpasta \u2192 Placera komponenter \u2192 \u00c5terfl\u00f6desl\u00f6dning (topptemperatur 245\u00b0C)<\/li>\n\n<li>L\u00e5t svalna till rumstemperatur och v\u00e4nd sedan PCB<\/li>\n\n<li>Sida B: Tryck l\u00f6dpasta \u2192 Placera komponenter \u2192 Anv\u00e4nd stegvis temperaturprofil (s\u00e4nk topptemperaturen med 5-10\u00b0C)<\/li><\/ol><p><strong>F\u00f6rdelar<\/strong>:<\/p><ul class=\"wp-block-list\"><li>H\u00f6g tillf\u00f6rlitlighet i l\u00f6dfogen<\/li>\n\n<li>L\u00e4mplig f\u00f6r automatiserad massproduktion<\/li><\/ul><p><strong>Risker<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Stora komponenter kan lossna under den andra omsm\u00e4ltningen<\/li>\n\n<li>Exakt temperaturkontroll kr\u00e4vs f\u00f6r l\u00f6dning p\u00e5 andra sidan<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Option_B_Solder_Paste_Red_Glue_Hybrid_Process_Solution_for_Large_Components\"><\/span>Alternativ B: Hybridprocess med l\u00f6dpasta + r\u00f6dlim (l\u00f6sning f\u00f6r stora komponenter)<span class=\"ez-toc-section-end\"><\/span><\/h3><p><strong>B\u00e4st f\u00f6r<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Ena sidan har stora kontaktdon\/elektrolytkondensatorer<\/li>\n\n<li>Blandade layouter med betydande viktskillnader<\/li><\/ul><p><strong>Innovativ process<\/strong>:<\/p><ol class=\"wp-block-list\"><li>Sidan med l\u00f6dpasta (sida A): Standard \u00e5terfl\u00f6desl\u00f6dning<\/li>\n\n<li>R\u00f6d limsida (sida B): &#8220;Print-Place-Cure&#8221; trestegsmetod:<\/li><\/ol><ul class=\"wp-block-list\"><li>Utskriftsnoggrannhet f\u00f6r r\u00f6tt lim: \u00b10,1 mm<\/li>\n\n<li>H\u00e4rdningstemperatur: 120-150\u00b0C (mycket l\u00e4gre \u00e4n l\u00f6dpastans sm\u00e4ltpunkt)<\/li>\n\n<li>V\u00e5gl\u00f6dning som tillval f\u00f6r \u00f6kad tillf\u00f6rlitlighet<\/li><\/ul><p><strong>Tekniska anm\u00e4rkningar<\/strong>:<\/p><ul class=\"wp-block-list\"><li>R\u00f6tt lim m\u00e5ste vara minst 0,3 mm fr\u00e5n l\u00f6dplattorna<\/li>\n\n<li>F\u00f6rl\u00e4nger h\u00e4rdningstiden med 30% f\u00f6r att f\u00f6rhindra svag vidh\u00e4ftning<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-1.jpg\" alt=\"\u00c5terfl\u00f6desl\u00f6dning av PCB\" class=\"wp-image-3562\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><p><a href=\"https:\/\/www.topfastpcb.com\/sv\/contact\/\">F\u00e5 gratis expertguider f\u00f6r hantverk<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Golden_Rules_for_Soldering_Quality_Control\"><\/span>5 gyllene regler f\u00f6r kvalitetskontroll av l\u00f6dning<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Optimera temperaturprofilen<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>F\u00f6rsta sidan: Standard RSS-kurva (Ramp-Soak-Spike) (2-3\u00b0C\/s uppv\u00e4rmningshastighet)<\/li>\n\n<li>Andra sidan:Anv\u00e4nd Ramp-to-Spike (RTS)-kurva (f\u00f6rl\u00e4ngd f\u00f6rv\u00e4rmningstid)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Riktlinjer f\u00f6r komponentlayout<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Placera tunga komponenter p\u00e5 samma sida<\/li>\n\n<li>F\u00f6rskjutning av dubbelsidiga BGA:er f\u00f6r att undvika termisk sp\u00e4nningskoncentration<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Kriterier f\u00f6r val av l\u00f6dpasta<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Andra sidan: Anv\u00e4nd l\u00f6dpasta f\u00f6r l\u00e5ga temperaturer (t.ex. Sn42\/Bi58)<\/li>\n\n<li>Viskositet f\u00f6r r\u00f6tt lim:&gt;50.000 cps<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Kritiska parametrar f\u00f6r utrustning<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Lutning p\u00e5 omsm\u00e4ltningsugnens transport\u00f6r: 5-7\u00b0.<\/li>\n\n<li>Kylningshastighet: 4-6\u00b0C\/s<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Uppgraderingar av inspektionsteknik<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Anv\u00e4nd 3D SPI f\u00f6r inspektion av l\u00f6dpastans tjocklek<\/li>\n\n<li>Obligatorisk akustisk mikroskopi efter den andra omsm\u00e4ltningen<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Issues_and_Engineering_Solutions\"><\/span>Vanliga problem och tekniska l\u00f6sningar<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>Problem 1: QFN-komponent f\u00f6rskjuts under andra omsm\u00e4ltningen<\/strong><\/p><ul class=\"wp-block-list\"><li>L\u00f6sning: Applicera h\u00f6gtemperaturslim efter l\u00f6dning p\u00e5 f\u00f6rsta sidan<\/li>\n\n<li>Parametrar:Anv\u00e4nd lim med &gt;200\u00b0C h\u00e4rdningstolerans<\/li><\/ul><p><strong>Problem 2: Komponent som sl\u00e4pper under v\u00e5gl\u00f6dning (sidan med r\u00f6tt lim)<\/strong><\/p><ul class=\"wp-block-list\"><li>F\u00f6rb\u00e4ttringar:<\/li><\/ul><ol class=\"wp-block-list\"><li>Efterh\u00e4rdning med UV efter applicering av r\u00f6tt lim<\/li>\n\n<li>F\u00f6rv\u00e4rm till 100\u00b0C f\u00f6re v\u00e5gl\u00f6dning<\/li><\/ol><p><strong>Problem 3: \u00d6verdriven h\u00e5ltagning i BGA-f\u00f6rband<\/strong><\/p><ul class=\"wp-block-list\"><li>Processoptimering:<\/li>\n\n<li>F\u00f6rl\u00e4ng upptiningstiden f\u00f6r l\u00f6dpasta till 8 timmar<\/li>\n\n<li>Anv\u00e4nd kv\u00e4veassisterat \u00e5terfl\u00f6de (O\u2082 &lt;500ppm)<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-2.jpg\" alt=\"\u00c5terfl\u00f6desl\u00f6dning av PCB\" class=\"wp-image-3563\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/double-sided-pcb-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Future_Process_Trends\"><\/span>Framtida processtrender<span class=\"ez-toc-section-end\"><\/span><\/h2><ol class=\"wp-block-list\"><li><strong>L\u00f6dning vid l\u00e5g temperatur<\/strong>: Sn-Bi-l\u00f6dlegeringar med pulsad uppv\u00e4rmning<\/li>\n\n<li><strong>Smart temperaturkontroll<\/strong>: Maskininl\u00e4rningsbaserad profiloptimering i realtid<\/li>\n\n<li><strong>Hybrid sammanfogning<\/strong>: Kombinerade l\u00f6sningar med l\u00f6dpasta och ledande lim<\/li><\/ol><p>Genom att systematiskt till\u00e4mpa dessa nyckeltekniker kan ingenj\u00f6rer uppn\u00e5 first-pass yields som \u00f6verstiger 99,5%.Vi rekommenderar att man implementerar system f\u00f6r \u00f6vervakning av processf\u00f6nster f\u00f6r kontinuerlig optimering i produktionsmilj\u00f6er.<\/p>","protected":false},"excerpt":{"rendered":"<p>Dubbelsidig \u00e5terfl\u00f6desl\u00f6dning av kretskort \u00e4r en k\u00e4rnprocess inom elektroniktillverkningen och omfattar val av processer f\u00f6r lodpasta och r\u00f6tt lim, kontroll av temperaturkurvan och strategier f\u00f6r dubbelsidig l\u00f6dning.Den h\u00e4r artikeln analyserar l\u00f6dningsprocessen f\u00f6r dubbelsidiga m\u00f6nsterkort, ger l\u00f6sningar p\u00e5 vanliga problem och ger tips f\u00f6r processoptimering f\u00f6r att f\u00f6rb\u00e4ttra l\u00f6dutbytet och produktionseffektiviteten.<\/p>","protected":false},"author":1,"featured_media":3564,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[111,320],"class_list":["post-3560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-pcb","tag-pcb-reflow-soldering"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to perform reflow soldering on double-sided PCB? 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