{"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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/","title":{"rendered":"Come eseguire la saldatura a riflusso su PCB a doppia faccia?"},"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\">Indice per materie<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Why_is_Double-Sided_PCB_Reflow_Soldering_a_Challenge_in_Electronics_Manufacturing\" >Perch\u00e9 la saldatura a rifusione di PCB su due lati \u00e8 una sfida nella produzione elettronica?<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#In-Depth_Comparison_of_Two_Main_Soldering_Processes\" >Confronto approfondito tra i due principali processi di saldatura<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Option_A_Double-Sided_Solder_Paste_Process_Ideal_for_High-Density_Components\" >Opzione A: Processo di pasta saldante su due lati (ideale per componenti ad alta densit\u00e0)<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Option_B_Solder_Paste_Red_Glue_Hybrid_Process_Solution_for_Large_Components\" >Opzione B: Processo ibrido pasta saldante + colla rossa (soluzione per componenti di grandi dimensioni)<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#5_Golden_Rules_for_Soldering_Quality_Control\" >5 regole d'oro per il controllo di qualit\u00e0 della saldatura<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Common_Issues_and_Engineering_Solutions\" >Problemi comuni e soluzioni tecniche<\/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\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/#Future_Process_Trends\" >Tendenze future dei processi<\/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>Perch\u00e9 la saldatura a rifusione di PCB su due lati \u00e8 una sfida nella produzione elettronica?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Nei prodotti elettronici ad alte prestazioni, come gli smartphone e i dispositivi di controllo industriale, <a href=\"https:\/\/www.topfastpcb.com\/it\/products\/double-sided-flexible-pcb\/\">PCB a doppia faccia<\/a> sono diventati lo standard. Tuttavia, la saldatura su due lati presenta due sfide importanti:<\/p><ol class=\"wp-block-list\"><li><strong>Complessit\u00e0 della gestione termica<\/strong> - Durante la saldatura sul secondo lato, il primo lato viene riscaldato, il che pu\u00f2 causare il distacco dei componenti o la rottura del giunto di saldatura.<\/li>\n\n<li><strong>Dilemma della selezione del processo<\/strong> - I processi della pasta saldante e della colla rossa hanno ciascuno pro e contro, e richiedono un'attenta considerazione in base alla disposizione dei componenti.<\/li><\/ol><p><a href=\"https:\/\/www.topfastpcb.com\/it\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Consultate i nostri ingegneri di processo<\/a>\u00a0per soluzioni personalizzate<\/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=\"Saldatura a riflusso di 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>Confronto approfondito tra i due principali processi di saldatura<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>Opzione A: Processo di pasta saldante su due lati (ideale per componenti ad alta densit\u00e0)<span class=\"ez-toc-section-end\"><\/span><\/h3><p><strong>Il migliore per<\/strong>:<\/p><ul class=\"wp-block-list\"><li>PCB con BGA, QFN o altri circuiti integrati di precisione su entrambi i lati<\/li>\n\n<li>Componenti complessivamente leggeri<\/li><\/ul><p><strong>Passi chiave<\/strong>:<\/p><ol class=\"wp-block-list\"><li>Lato A: Stampa della pasta saldante \u2192 Posizionamento dei componenti \u2192 Reflow della saldatura (temperatura di picco 245\u00b0C)<\/li>\n\n<li>Raffreddare a temperatura ambiente, quindi girare il PCB<\/li>\n\n<li>Lato B: Stampare la pasta saldante \u2192 Posizionare i componenti \u2192 Utilizzare un profilo di temperatura a gradini (ridurre la temperatura di picco di 5-10\u00b0C)<\/li><\/ol><p><strong>vantaggi<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Elevata affidabilit\u00e0 del giunto di saldatura<\/li>\n\n<li>Adatto alla produzione di massa automatizzata<\/li><\/ul><p><strong>I rischi<\/strong>:<\/p><ul class=\"wp-block-list\"><li>I componenti di grandi dimensioni possono staccarsi durante la seconda rifusione.<\/li>\n\n<li>Per la saldatura sul secondo lato \u00e8 necessario un controllo preciso della temperatura.<\/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>Opzione B: Processo ibrido pasta saldante + colla rossa (soluzione per componenti di grandi dimensioni)<span class=\"ez-toc-section-end\"><\/span><\/h3><p><strong>Il migliore per<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Un lato \u00e8 dotato di grandi connettori\/condensatori elettrolitici<\/li>\n\n<li>Layout misti con differenze di peso significative<\/li><\/ul><p><strong>Processo innovativo<\/strong>:<\/p><ol class=\"wp-block-list\"><li>Lato pasta saldante (lato A): Saldatura a riflusso standard<\/li>\n\n<li>Lato colla rossa (lato B): &#8220;Print-Place-Cure&#8221; metodo a tre fasi:<\/li><\/ol><ul class=\"wp-block-list\"><li>Precisione di stampa della colla rossa: \u00b10,1 mm<\/li>\n\n<li>Temperatura di polimerizzazione: 120-150\u00b0C (molto inferiore al punto di fusione della pasta saldante)<\/li>\n\n<li>Saldatura a onda opzionale per una maggiore affidabilit\u00e0<\/li><\/ul><p><strong>Note tecniche<\/strong>:<\/p><ul class=\"wp-block-list\"><li>La colla rossa deve essere distante almeno 0,3 mm dalle piazzole di saldatura.<\/li>\n\n<li>Prolunga il tempo di polimerizzazione del 30% per evitare un'adesione debole.<\/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=\"Saldatura a riflusso di 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\/it\/contact\/\">Ottenere guide gratuite di esperti di crafting<\/a><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Golden_Rules_for_Soldering_Quality_Control\"><\/span>5 regole d'oro per il controllo di qualit\u00e0 della saldatura<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\"><li><strong>Ottimizzare il profilo della temperatura<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Primo lato: Curva standard Rampa-Soak-Spike (RSS) (velocit\u00e0 di riscaldamento di 2-3\u00b0C\/s)<\/li>\n\n<li>Secondo lato:Utilizzare la curva Ramp-to-Spike (RTS) (tempo di preriscaldamento prolungato)<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Linee guida per la disposizione dei componenti<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Posizionare i componenti pesanti sullo stesso lato<\/li>\n\n<li>Sfalsare i BGA a doppia faccia per evitare la concentrazione di stress termico<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Criteri di selezione della pasta saldante<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Secondo lato: Utilizzare pasta saldante a bassa temperatura (ad esempio, Sn42\/Bi58).<\/li>\n\n<li>Viscosit\u00e0 della colla rossa:&gt;50.000 cps<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Parametri critici dell'apparecchiatura<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Inclinazione del convogliatore del forno di riflusso: 5-7<\/li>\n\n<li>Velocit\u00e0 di raffreddamento: 4-6\u00b0C\/s<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Aggiornamenti della tecnologia di ispezione<\/strong><\/li><\/ul><ul class=\"wp-block-list\"><li>Utilizzo di SPI 3D per l'ispezione dello spessore della pasta saldante<\/li>\n\n<li>Microscopia acustica obbligatoria dopo la seconda rifusione<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Issues_and_Engineering_Solutions\"><\/span>Problemi comuni e soluzioni tecniche<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>Problema 1: spostamento del componente QFN durante la seconda rifusione<\/strong><\/p><ul class=\"wp-block-list\"><li>Soluzione: Applicare l'adesivo ad alta temperatura dopo la prima saldatura.<\/li>\n\n<li>Parametri:Utilizzare un adesivo con tolleranza di polimerizzazione &gt;200\u00b0C<\/li><\/ul><p><strong>Problema 2: caduta dei componenti durante la saldatura a onda (lato colla rossa)<\/strong><\/p><ul class=\"wp-block-list\"><li>Miglioramenti:<\/li><\/ul><ol class=\"wp-block-list\"><li>Post-cura con UV dopo l'applicazione della colla rossa<\/li>\n\n<li>Preriscaldare a 100\u00b0C prima di saldare ad onda<\/li><\/ol><p><strong>Problema 3: Eccessivo vuoto nelle giunzioni BGA<\/strong><\/p><ul class=\"wp-block-list\"><li>Ottimizzazione del processo:<\/li>\n\n<li>Estensione del tempo di scongelamento della pasta saldante a 8 ore<\/li>\n\n<li>Utilizzare il riflusso assistito da azoto (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=\"Saldatura a riflusso di 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>Tendenze future dei processi<span class=\"ez-toc-section-end\"><\/span><\/h2><ol class=\"wp-block-list\"><li><strong>Saldatura a bassa temperatura<\/strong>: Leghe di saldatura Sn-Bi con riscaldamento pulsato<\/li>\n\n<li><strong>Controllo intelligente della temperatura<\/strong>: Ottimizzazione del profilo in tempo reale basata sull'apprendimento automatico<\/li>\n\n<li><strong>Giunzione ibrida<\/strong>: Soluzioni combinate di pasta saldante + adesivo conduttivo<\/li><\/ol><p>Applicando sistematicamente queste tecniche chiave, i tecnici possono ottenere rendimenti di primo passaggio superiori al 99,5%.Si consiglia di implementare sistemi di monitoraggio delle finestre di processo per un'ottimizzazione continua negli ambienti di produzione.<\/p>","protected":false},"excerpt":{"rendered":"<p>La saldatura a riflusso di PCB su due lati \u00e8 un processo fondamentale nella produzione di elettronica, che implica la selezione dei processi di pasta saldante e colla rossa, il controllo della curva di temperatura e le strategie di saldatura su due lati. Questo articolo analizza il processo di saldatura dei PCB a doppia faccia, fornisce soluzioni ai problemi pi\u00f9 comuni e offre suggerimenti per l'ottimizzazione del processo al fine di migliorare la resa della saldatura e l'efficienza della produzione.<\/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? - Topfastpcb<\/title>\n<meta name=\"description\" content=\"Master the key steps of double-sided PCB reflow soldering, from solder paste and red glue process selection to temperature control techniques, providing a complete soldering solution to solve common problems such as cold soldering and component loss.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.topfastpcb.com\/it\/blog\/how-to-perform-reflow-soldering-on-double-sided-pcb\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to perform reflow soldering on double-sided PCB? 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