{"id":4769,"date":"2026-03-04T09:39:03","date_gmt":"2026-03-04T09:39:03","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4769"},"modified":"2026-03-04T09:39:07","modified_gmt":"2026-03-04T09:39:07","slug":"rohs-compliance-for-pcbs-materials-processes","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/rohs-compliance-for-pcbs-materials-processes\/","title":{"rendered":"Overholdelse af RoHS for PCB'er: Materialer og processer"},"content":{"rendered":"<p>Siden EU formelt lovgav om \u201cblyfrihed\u201d i december 2003, har den globale elektronikindustri m\u00e6rket en st\u00e6rk p\u00e5virkning. I juli 2006 tr\u00e5dte EU-direktiverne om affald af elektrisk og elektronisk udstyr (WEEE) og om begr\u00e6nsning af farlige stoffer (RoHS) i kraft. Samtidig tr\u00e5dte regler om blyfrihed og halogenfrihed fra Japan Electronics and Information Technology Industries Association (JEITA) og U.S. National Electrical Manufacturers Association (NEMA) i kraft for den elektroniske emballageindustri. Fra da af m\u00e5 elektroniske produkter, der markedsf\u00f8res, ikke indeholde bly, kviks\u00f8lv, cadmium, hexavalent krom eller begr\u00e6nsede m\u00e6ngder af polybromerede biphenyler (PBB) eller polybromerede diphenylethere (PBDE) og andre skadelige stoffer. Denne \u00e6ndring p\u00e5virker den globale forsyningsk\u00e6de og udviklingen af relaterede industrier, herunder PCB-sektoren. Denne artikel forklarer, hvordan n\u00e6ste generation af printkortprodukter kan opfylde de stadig strengere milj\u00f8regler p\u00e5 tv\u00e6rs af r\u00e5varekontrol, udv\u00e6lgelse og kontrol af blyfri processer og SMT-slutmontage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Udv\u00e6lgelse og kontrol af r\u00e5varer<\/h2>\n\n\n\n<p>Det er velkendt, at kviks\u00f8lv, cadmium og hexavalent krom n\u00e6sten aldrig bruges i PCB-industrien. Bortset fra sporm\u00e6ngder i v\u00e5dbehandling bruger PCB-producenter ikke disse elementer bevidst. S\u00e5 n\u00e5r man v\u00e6lger r\u00e5materialer og processer, er det vigtigste krav at holde bly- (Pb) og halogenniveauerne under gr\u00e6nsev\u00e6rdierne for at opfylde de grundl\u00e6ggende milj\u00f8regler. For PCB-overfladens metalfinish er m\u00e5let at v\u00e6re blyfri (under 0,1% Pb). Traditionelle PCB- og <a href=\"https:\/\/flj-pcb.com\/da\/pcb-assembly\/smt-assembly\/\" data-type=\"page\" data-id=\"1923\">SMT <\/a>Industrien brugte mange bly-tin-legeringer, f.eks. i HASL og loddepasta. Bly er et tungmetal, og det findes overalt i naturen. N\u00e5r menneskers indtag af bly overskrider sikre niveauer, kan der opst\u00e5 symptomer som an\u00e6mi, calciummangel og nedsat immunforsvar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.1 Hvorfor bruge blyfri loddetin?<\/h3>\n\n\n\n<p>Skader fra bly i loddetin: Selv om blyet i loddetin udg\u00f8r en lille del af det samlede blyforbrug i nogle skalaer, kan det sprede sig og er sv\u00e6rt at f\u00e5 helt tilbage. Milj\u00f8forurening og bekymringer om blyforgiftning skubber udviklingen v\u00e6k fra bly. I PCB'er bruges halogener (fluor F, klor Cl, brom Br, jod I) hovedsageligt i laminater og trykfarver.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.2 Screening af materialer<\/h3>\n\n\n\n<p>Et f\u00e6rdigt printkort indeholder hovedsageligt tre grupper af ting: laminatet (basismaterialet), metaloverfladelagene og bl\u00e6k.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.1 Grundmateriale<\/h4>\n\n\n\n<p>Almindelige laminater som f.eks. <a href=\"https:\/\/flj-pcb.com\/da\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR-4<\/a> og CEM-3 indeholder ofte en masse bromerede epoxyharpikser. Disse harpikser kan omfatte tetrabrombisphenol A, polybromerede biphenyler og polybromerede diphenylethere. N\u00e5r disse materialer br\u00e6nder, kan de frigive meget giftige forbindelser som dioxiner (TCDD) og furaner. Hvis mennesker indtager s\u00e5danne forbindelser, er de sv\u00e6re at fjerne fra kroppen, og de udg\u00f8r en alvorlig sundhedsrisiko. Derfor skal den kobberbekl\u00e6dte laminatindustri g\u00e5 over til halogenfrie basismaterialer. Halogenfri betyder, at klor og brom begge er under ca. 0,09%. Brug fosforholdige epoxyharpikser til at erstatte bromerede epoxyharpikser. Brug nitrogenholdige phenolharpikser til at erstatte traditionelle dicyandiamid-h\u00e6rdere.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate.webp\" alt=\"Halogen-free substrate\" class=\"wp-image-4771\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-768x576.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Halogen-free-substrate-16x12.webp 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Milj\u00f8venlige laminater skal ogs\u00e5 have en st\u00e6rk varmebestandighed. De skal kunne modst\u00e5 flere blyfri SMT-reflow-cyklusser p\u00e5 omkring 260 \u00b0C uden at blive misfarvede, delaminerede, deformerede eller sk\u00e6ve.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.2 Overfladiske metallag<\/h4>\n\n\n\n<p>Industrien bruger nu i vid udstr\u00e6kning blyfri HASL med en tin-s\u00f8lv-kobber-formel (f.eks. 95,5Sn-3,9Ag-0,6Cu) i stedet for bly-tin-legeringer. Blyfri PCB-overfladebel\u00e6gninger skal have en god befugtning og et godt flow. De skal producere lav termisk stress og modst\u00e5 oxidation ved h\u00f8j temperatur. Dette hj\u00e6lper den blyfri SMT-behandling. Den flux, der bruges til HASL, skal ogs\u00e5 v\u00e6re milj\u00f8venlig, genanvendelig og kompatibel med SMT-flux, s\u00e5 de flyder sammen.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.3 Bl\u00e6k<\/h4>\n\n\n\n<p>Bl\u00e6k, der efterlades p\u00e5 printkortet, omfatter loddemaskebl\u00e6k, tegnbl\u00e6k og via-fill-bl\u00e6k. Bl\u00e6kformler ligner laminatformler. De indeholder hovedsageligt harpiks, bromerede flammeh\u00e6mmere og h\u00e6rdningsmidler. Mange moderne bl\u00e6km\u00e6rker producerer allerede bl\u00e6k uden skadelige stoffer. Valget af bl\u00e6k skal opfylde milj\u00f8reglerne og ogs\u00e5 overleve gentagne blyfri SMT-cyklusser ved h\u00f8je temperaturer. Bl\u00e6k m\u00e5 ikke delaminere, misfarves, flage eller revne efter behandling.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.2.4 Kontrol af blyfri materialer<\/h4>\n\n\n\n<p>R\u00e5varestyring er et meget vigtigt led i en milj\u00f8venlig printkortproduktion. Hvis der f.eks. ved en fejl tilf\u00f8jes en blyholdig loddestang til en ren tinpotte, kan resultatet v\u00e6re katastrofalt. Rester fra indirekte materialer som flux m\u00e5 ikke ignoreres. Praktiske foranstaltninger omfatter:<\/p>\n\n\n\n<p>Ops\u00e6t materialekoder for halogenfri og blyfri r\u00e5materialer.<\/p>\n\n\n\n<p>Brug farvem\u00e6rker, og tryk en godkendt \u201cgr\u00f8n\u201d etiket p\u00e5 yder- og inderemballage.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label.webp\" alt=\"Green label\" class=\"wp-image-4770\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-300x300.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-150x150.webp 150w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Green-label-12x12.webp 12w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<p>Opbevar milj\u00f8venlige materialer separat p\u00e5 lageret og i produktionen. Udpeg specifikke medarbejdere til at tilf\u00f8je dem i produktionen.<\/p>\n\n\n\n<p>Implementer et certificeringsprogram for \u201cgr\u00f8nne kvalificerede leverand\u00f8rer\u201d.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Valg og kontrol af blyfri processer<\/h2>\n\n\n\n<p>Blyfri overfladeprocesser til printkort omfatter elektropletteret Ni\/Au, elektrol\u00f8s Ni\/immersion Au, OSP (organisk loddemiddel), immersion tin (kemisk tin) og immersion s\u00f8lv (kemisk s\u00f8lv).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 Skridt til at indf\u00f8re blyfri processer<\/h3>\n\n\n\n<p>F\u00f8lg disse trin: teknisk design \u2192 teknisk udvikling \u2192 p\u00e5lidelighedsevaluering \u2192 materialeindk\u00f8b \u2192 projektimplementering og teknisk udrulning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 Procesimplementering og -kontrol<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.1 Teknisk CAM-design<\/h4>\n\n\n\n<p>Design p\u00e5 projektniveau for milj\u00f8venlige printkort skal tage h\u00f8jde for effekter p\u00e5 SMT-efterbehandling og printkortets funktion efter montering. CAM-arbejde skal tage h\u00f8jde for SMT-trin.<\/p>\n\n\n\n<p>Eksempel p\u00e5 layoutdesign (routing og padformer):<\/p>\n\n\n\n<p>Undg\u00e5 komponentbev\u00e6gelser under b\u00f8lgelodning eller selektiv lodning. G\u00f8r nogle paddiametre lidt mindre for at reducere risikoen for brodannelse.<\/p>\n\n\n\n<p>Undg\u00e5, at QFP-ledninger danner bro under b\u00f8lgelodning. Vip om n\u00f8dvendigt QFP-delene, og lav dummy-loddeomr\u00e5der.<\/p>\n\n\n\n<p>Hold dig til tidligere regler for softmelt-chips. Placer \u00e5bninger til beskyttelsesfilm n\u00e6r de indre kanter.<\/p>\n\n\n\n<p>Forebyg sk\u00e6vvridning af pladen:<\/p>\n\n\n\n<p>Tjek kortets varmebestandighed. V\u00e6r opm\u00e6rksom p\u00e5 softmelt-spidstemperaturer under fugt.<\/p>\n\n\n\n<p>Til store plader eller plader, der b\u00e6rer tunge dele, skal du forberede st\u00f8tteomr\u00e5der i midten for at reducere vridning.<\/p>\n\n\n\n<p>N\u00e5r du placerer dele, skal du fors\u00f8ge at g\u00f8re den termiske massefordeling j\u00e6vn.<\/p>\n\n\n\n<p>Tynde plader i flere lag eller plader med sk\u00e5rne riller er lette at vride under softmelt-varme. Overvej form og st\u00f8rrelse n\u00f8je.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.2 Teknisk udvikling<\/h4>\n\n\n\n<p>Procesudvikling og -kontrol er et n\u00f8gleomr\u00e5de for milj\u00f8venlig PCB-produktion. Praktiske handlinger omfatter:<\/p>\n\n\n\n<p>K\u00f8r ikke milj\u00f8venlige og ikke-milj\u00f8venlige materialer p\u00e5 samme linje. Adskil processer som fremkaldelse og slutreng\u00f8ring.<\/p>\n\n\n\n<p>M\u00e6rk milj\u00f8produkter p\u00e5 MI-ark (produktionsinstruktioner). Kr\u00e6v en underskrift, der bekr\u00e6fter den blyfri proces, for at minde operat\u00f8rerne om det.<\/p>\n\n\n\n<p>G\u00f8r v\u00e6rkt\u00f8jer og inventar til produktion af milj\u00f8produkter tydelige med synlige etiketter.<\/p>\n\n\n\n<p>Bl\u00e6k skal kunne modst\u00e5 gentagen blyfri SMT ved h\u00f8je temperaturer. Forbehandling og t\u00f8rring af substratet er meget vigtigt. Efter HASL eller blyfri SMT kan bl\u00e6kket skalle af ved hulkanterne. Det skyldes ofte fugt, der er efterladt i huller og p\u00e5 overflader. Under h\u00f8j varme udvider fugten sig og adskiller bl\u00e6k fra kobber.<\/p>\n\n\n\n<p>Tils\u00e6t ikke fortynder til loddemaskebl\u00e6k. P\u00e5 den m\u00e5de undg\u00e5s hurtig fordampning af opl\u00f8sningsmiddel i huller under h\u00f8j varme, hvilket kan beskadige hullerne.<\/p>\n\n\n\n<p>Hold kobberindholdet i HASL-loddetindene under 0,85%.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2.2.3 Evaluering af p\u00e5lidelighed<\/h4>\n\n\n\n<p>Sammenlignet med ikke-\u00f8ko-PCB'er har milj\u00f8venlige PCB'er brug for st\u00e6rkere p\u00e5lidelighedstest. Tilf\u00f8j disse tests:<\/p>\n\n\n\n<p>Test af loddeevne. Brug den samme type blyfri loddetin, som skal bruges i produktionen.<\/p>\n\n\n\n<p>Test af termisk chok. Betingelser: -40 \u00b0C \/ 85 \u00b0C \/ 125 \u00b0C. Efter 3000 cyklusser m\u00e5 der ikke v\u00e6re revner.<\/p>\n\n\n\n<p>Test af termisk cykling. Ingen revner og ingen svindlommer.<\/p>\n\n\n\n<p>Test med fugtig varme. Betingelser: 60 \u00b0C og 90-95% RH i 500 timer. Under langvarig h\u00f8j temperatur og fugtighed b\u00f8r der ikke v\u00e6re nogen metalh\u00e5rlignende produkter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Milj\u00f8venlig PCB i SMT-slutmontering<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 Blyfri SMT-egenskaber<\/h3>\n\n\n\n<p>Blyfrit loddetin har et h\u00f8jere smeltepunkt. Det har lavere befugtning og flow, h\u00f8jere termisk stress, d\u00e5rligere befugtningsevne og er mere tilb\u00f8jeligt til at oxidere. Det kr\u00e6ver strengere produktionsbetingelser og kvalitetskontrol.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.1 Design af SMT-linjer<\/h4>\n\n\n\n<p>\u00d8g forvarmningstemperaturen. Kontroll\u00e9r SMT-linjens hastighed til ca. 1,2-1,8 m\/min. Indstil transportb\u00e5ndets h\u00e6ldning til 3-5 grader. S\u00f8rg for termisk kompensation, hvor det er n\u00f8dvendigt, s\u00e5 SMT-omr\u00e5det holder en stabil temperatur.<\/p>\n\n\n\n<p>For at sikre god befugtning skal du holde den rette forvarmningstemperatur.<\/p>\n\n\n\n<p>Loddekolbe og termisk kontrol:<\/p>\n\n\n\n<p>Overfladetemperaturen p\u00e5 printet skal holde sig under den garanterede termiske gr\u00e6nse, mens printets bagside kan n\u00e5 op p\u00e5 ca. 250 \u00b0C. Afkort afstanden mellem opvarmningstrinnene for at holde temperaturfaldet mellem b\u00f8lgerne inden for ca. 55 \u00b0C.<\/p>\n\n\n\n<p>N\u00e5r man bruger Sn-Ag-Cu-loddetin, kan det v\u00e6re muligt at stoppe med at bruge den f\u00f8rste b\u00f8lge.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.2 Manuel rework-lodning<\/h4>\n\n\n\n<p>Indstil loddekolbens temperatur til ca. 370 \u00b1 10 \u00b0C. Brug en forkromet spids. Brug et 80 W jern til korte kontakttider, f.eks. 3 sekunder. Forvarm substratet til 50-60 \u00b0C. Hvis en loddekolbe har v\u00e6ret ubrugt i lang tid, skal spidsen renses for forurening. Fugt spidsen med frisk loddetin, og sluk derefter for str\u00f8mmen for at forhindre oxidering.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3.1.3 Brug af kv\u00e6lstofbeskyttelse og dens fordele<\/h4>\n\n\n\n<p>Forbedre atmosf\u00e6ren i processen.<\/p>\n\n\n\n<p>Reducerer oxidering og forbedrer loddets befugtning p\u00e5 komponentledninger.<\/p>\n\n\n\n<p>Forbedre udseendet, da blyfri fuger er mindre blanke.<\/p>\n\n\n\n<p>Reducerer farve\u00e6ndring for\u00e5rsaget af lang eksponering ved h\u00f8j temperatur i blyfri processer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 Forskning og s\u00e6rlige procesnoter<\/h3>\n\n\n\n<p>3.2.1 Unders\u00f8g lodder med lavt smeltepunkt under 125 \u00b0C som en mulighed i s\u00e6rlige tilf\u00e6lde.<\/p>\n\n\n\n<p>3.2.2 Brug lokale opvarmningsmetoder (punktopvarmning, infrar\u00f8d eller RF) til at lodde visse dele ved 240-260 \u00b0C. Delene skal kunne t\u00e5le varme i mere end 40 sekunder. Lokale opvarmningsv\u00e6rkt\u00f8jer kan omfatte lasere, xenonblitz (kontaktfri), varme skydere eller pulsvarmere (kontakt).<\/p>\n\n\n\n<p>3.2.3 F\u00f8lg standarder som <a href=\"https:\/\/ja.wikipedia.org\/wiki\/ISO_14000\" target=\"_blank\" rel=\"noopener\">ISO 14000<\/a> og kundens processpecifikationer. Gr\u00f8n praksis omfatter blyfri og halogenfri materialer, luftrensning og fluxgenvindingssystemer, der kan filtrere og genbruge ca. 90% flux.<\/p>\n\n\n\n<p>3.2.4 Brug foranstaltninger mod skimmel og termitter, hvor det er n\u00f8dvendigt for PCB.<\/p>\n\n\n\n<p>3.2.5 Forskning og anvendelse af genanvendelige og biologisk nedbrydelige organiske PCB-substrater.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Sammenfattende tjekliste til ingeni\u00f8rer og produktionsteams<\/h2>\n\n\n\n<p>Kontroll\u00e9r alle r\u00e5materialers analysecertifikater (COA). Bekr\u00e6ft, at halogen- og blyniveauer er under gr\u00e6nsev\u00e6rdierne. Opbevar COA-filer til revisioner.<\/p>\n\n\n\n<p>Brug separat opbevaring og tydelig m\u00e6rkning af blyfri og halogenfri materialer. Uddan personalet i at undg\u00e5 krydskontaminering.<\/p>\n\n\n\n<p>Opdater CAD- og CAM-regler til blyfri behandling. Juster padst\u00f8rrelser og loddemaske\u00e5bninger efter behov.<\/p>\n\n\n\n<p>Udf\u00f8r pr\u00f8vek\u00f8rsler og evaluer loddeevne, termisk chok, termisk cykling og test med fugtig varme. Spor resultaterne, og sammenlign med baseline.<\/p>\n\n\n\n<p>Kontroller HASL-badets sammens\u00e6tning og overv\u00e5g kobberindholdet. Hold pletterings- og reng\u00f8ringsprocesserne under kontrol.<\/p>\n\n\n\n<p>S\u00f8rg for, at forvarmningszonerne p\u00e5 SMT-linjerne er stabile. Brug nitrogen, n\u00e5r det er muligt, for at reducere oxidation.<\/p>\n\n\n\n<p>Forbedre t\u00f8rre- og udbagningstrin for at fjerne fugt f\u00f8r h\u00f8jtemperaturprocesser. Brug kontrollerede ovne til t\u00f8rring af substratet.<\/p>\n\n\n\n<p>P\u00e5f\u00f8r conformal coating, n\u00e5r produktets anvendelse eller milj\u00f8et kr\u00e6ver ekstra fugtbeskyttelse.<\/p>\n\n\n\n<p>Oprethold leverand\u00f8raudits og godkend kun gr\u00f8nne kvalificerede leverand\u00f8rer. Kr\u00e6v leverand\u00f8rerkl\u00e6ringer for RoHS- og halogenfri status.<\/p>\n\n\n\n<p>Planl\u00e6g for genbrug ved endt levetid. Design til adskillelse og materialegenvinding, n\u00e5r det er muligt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Afsluttende noter<\/h2>\n\n\n\n<p>At opfylde RoHS-reglerne er ikke kun en materiel \u00e6ndring. Det er en \u00e6ndring p\u00e5 tv\u00e6rs af hele forsyningsk\u00e6den. Det p\u00e5virker materialevalg, fabrikkens processtyring, produktdesign og slutmontering. Det \u00e6ndrer ogs\u00e5 testning og langsigtet p\u00e5lidelighedsarbejde. Teams skal planl\u00e6gge omhyggeligt og handle i trin. Start med streng materialekontrol og CAM-design. Udvikl stabile blyfri processer. K\u00f8r grundige p\u00e5lidelighedstests. Uddan operat\u00f8rer, og f\u00f8r klare optegnelser. Med disse trin kan printkortproducenter levere RoHS-kompatible og p\u00e5lidelige produkter til kunder og milj\u00f8.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Since the European Union formally legislated &#8220;lead-free&#8221; in December 2003, the global electronics industry felt a strong impact. By July 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