{"id":5924,"date":"2026-07-14T08:27:00","date_gmt":"2026-07-14T00:27:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5924"},"modified":"2026-06-25T15:27:53","modified_gmt":"2026-06-25T07:27:53","slug":"pcb-core-and-prepreg","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/","title":{"rendered":"PCB-ydin- ja prepreg-materiaalit"},"content":{"rendered":"<p>Jokainen monikerroksinen piirilevy perustuu kahteen perusmateriaaliin: ytimeen ja prepreg-materiaaliin. Vaikka ne ovat harvoin n\u00e4kyviss\u00e4 valmiissa tuotteessa, niill\u00e4 on ratkaiseva merkitys piirilevyn paksuuden, kerrosten v\u00e4lisen et\u00e4isyyden, impedanssin hallinnan, mekaanisen vakauden ja valmistuksen luotettavuuden kannalta.<\/p><p>Olipa kyseess\u00e4 sitten yksinkertainen nelikerroksinen piirilevy tai monimutkainen, useista kerroksista koostuva takalevy, ydin- ja prepreg-materiaalien yhteisvaikutuksen ymm\u00e4rt\u00e4minen on olennaisen t\u00e4rke\u00e4\u00e4 kerrostussuunnittelun ja piirilevyjen valmistuksen kannalta.<\/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\/2026\/06\/PCB-Core-and-Prepreg-Materials.jpg\" alt=\"PCB-ydin- ja prepreg-materiaalit\" class=\"wp-image-5925\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><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\">Sis\u00e4llysluettelo<\/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\/fi\/blog\/pcb-core-and-prepreg\/#What_Is_PCB_Core_Material\" >Mik\u00e4 on piirilevyn ydinmateriaali?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Functions_of_Core_Material\" >Ydinmateriaalin ominaisuudet<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#What_Is_PCB_Prepreg\" >Mik\u00e4 on PCB-prepreg?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#How_Core_and_Prepreg_Work_Together\" >Miten ydin ja prepreg toimivat yhdess\u00e4<\/a><\/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\/fi\/blog\/pcb-core-and-prepreg\/#Common_Core_Materials\" >Yhteisten ydinopetussuunnitelman oppimateriaalit<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Standard_FR4_Core\" >Vakiomallinen FR4-ydin<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#High_TG_Core_Materials\" >Korkean TG-arvon omaavat ydinmateriaalit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#High-Speed_Core_Materials\" >Suurnopeusydinmateriaalit<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Common_Prepreg_Types\" >Yleisimm\u00e4t prepreg-tyypit<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Low_Resin_Prepreg\" >V\u00e4h\u00e4hartsinen prepreg<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#High_Resin_Prepreg\" >Korkeapitoinen prepreg-muovi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Core_and_Prepreg_in_Impedance_Control\" >Ydinmateriaali ja prepreg impedanssin hallinnassa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Material_Selection_for_Multilayer_PCBs\" >Materiaalivalinta monikerroksisille piirilevyille<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Electrical_Performance\" >S\u00e4hk\u00f6inen suorituskyky<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Thermal_Requirements\" >L\u00e4mp\u00f6vaatimukset<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Board_Thickness\" >Levyn paksuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Manufacturing_Capability\" >Tuotantokapasiteetti<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Cost_Considerations\" >Kustannusn\u00e4k\u00f6kohdat<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Common_Challenges_During_Lamination\" >Laminoinnin aikana esiintyv\u00e4t yleiset haasteet<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Resin_Starvation\" >Hartsin puute<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Excessive_Resin_Flow\" >Liiallinen hartsin virtaus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Delamination\" >Delaminaatio<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Thickness_Variation\" >Paksuuden vaihtelu<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#Why_Material_Compatibility_Matters\" >Miksi materiaalien yhteensopivuus on t\u00e4rke\u00e4\u00e4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-core-and-prepreg\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_PCB_Core_Material\"><\/span>Mik\u00e4 on piirilevyn ydinmateriaali?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Ydinmateriaali on t\u00e4ysin kovettunut laminaatti, jonka molemmille puolille on liimattu kuparifolio.<\/p><p>Se toimii monikerroksisen piirilevyn rakenteellisena perustana ja takaa j\u00e4ykkyyden valmistusvaiheessa.<\/p><p>Tyypillinen ydin koostuu seuraavista osista:<\/p><ul class=\"wp-block-list\"><li>Lasikuitulujitus<\/li>\n\n<li>Hartsij\u00e4rjestelm\u00e4<\/li>\n\n<li>Kuparifolio molemmilla pinnoilla<\/li><\/ul><p>Rakenne on samanlainen kuin edell\u00e4 k\u00e4sitellyiss\u00e4 tavanomaisissa laminaattimateriaaleissa <strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/pcb-laminate-materials\/\">PCB-laminaattimateriaalien selitys<\/a><\/strong>, paitsi ett\u00e4 hartsi on jo kovettunut.<\/p><p>Ydinmateriaaleja on saatavilla monenlaisina paksuuksina, jotta ne sopivat erilaisiin kerrostusvaatimuksiin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Functions_of_Core_Material\"><\/span>Ydinmateriaalin ominaisuudet<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Ydin kerrokset tarjoavat:<\/p><ul class=\"wp-block-list\"><li>Mekaaninen lujuusN\/OFF)<\/li>\n\n<li>S\u00e4hk\u00f6eristys<\/li>\n\n<li>Kuparituki<\/li>\n\n<li>Muodonpysyvyys<\/li><\/ul><p>Ilman ytimi\u00e4 monikerroksiset piirilevyt eiv\u00e4t s\u00e4ilytt\u00e4isi rakenteellista eheytt\u00e4\u00e4n laminoinnin ja kokoonpanon aikana.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_PCB_Prepreg\"><\/span>Mik\u00e4 on PCB-prepreg?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Prepreg on lyhenne sanoista \u201dpre-impregnated\u201d (esikyll\u00e4stetty) materiaali.<\/p><p>Se koostuu lasikuitukankaasta, joka on kyll\u00e4stetty osittain kovettuneella hartsilla.<\/p><p>Toisin kuin ydinmateriaali, prepreg pysyy puolikovettuneessa tilassa ennen laminointia.<\/p><p>PCB-laminointiprosessin aikana l\u00e4mp\u00f6 ja paine saavat hartsin virtaamaan ja kovettumaan t\u00e4ysin, jolloin vierekk\u00e4iset kerrokset kiinnittyv\u00e4t toisiinsa.<\/p><p>Prepreg-kerros sis\u00e4lt\u00e4\u00e4 tyypillisesti seuraavia aineita:<\/p><ul class=\"wp-block-list\"><li>Lasikuitukangas<\/li>\n\n<li>Osittain kovettunut epoksihartsi<\/li>\n\n<li>Ei kuparifoliota<\/li><\/ul><p>Sen p\u00e4\u00e4asiallinen tarkoitus on luoda tarttuvuus ydinkerroksien v\u00e4lille.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Core_and_Prepreg_Work_Together\"><\/span>Miten ydin ja prepreg toimivat yhdess\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Monikerroksinen piirilevy on pohjimmiltaan kuparikerrosten pino, jota erottavat toisistaan ytimet ja prepregit.<\/p><p>Esimerkiksi tyypillinen nelikerroksinen rakenne voi n\u00e4ytt\u00e4\u00e4 t\u00e4lt\u00e4:<\/p><pre class=\"wp-block-code\"><code>Kupari\nYdin\nKupari\nPrepreg\nKupari\nYdin\nKupari<\/code><\/pre><p>Laminoinnin aikana:<\/p><ol start=\"1\" class=\"wp-block-list\"><li>Prepreg pehmenee.<\/li>\n\n<li>Hartsia valuu rakoihin.<\/li>\n\n<li>Kerrokset on liimattu toisiinsa.<\/li>\n\n<li>Hartsin kovettuminen on p\u00e4\u00e4ttynyt.<\/li>\n\n<li>Muodostuu yksi kiinte\u00e4 rakenne.<\/li><\/ol><p>T\u00e4ss\u00e4 prosessissa valmistetaan nykyaikaisessa elektroniikassa k\u00e4ytett\u00e4v\u00e4 monikerroksinen piirilevy.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Core_Materials\"><\/span>Yhteisten ydinopetussuunnitelman oppimateriaalit<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_FR4_Core\"><\/span>Vakiomallinen FR4-ydin<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Suurin osa monikerroksisista piirilevyist\u00e4 on valmistettu FR4-ydinmateriaalista.<\/p><p>Edut sis\u00e4lt\u00e4v\u00e4t:<\/p><ul class=\"wp-block-list\"><li>Alhaiset kustannukset<\/li>\n\n<li>Hyv\u00e4 mekaaninen lujuus<\/li>\n\n<li>Vakaat prosessointiominaisuudet<\/li>\n\n<li>Laaja saatavuus<\/li><\/ul><p>Yleisk\u00e4ytt\u00f6isess\u00e4 elektroniikassa FR4 on edelleen yleisimmin k\u00e4ytetty vaihtoehto.<\/p><p>Insin\u00f6\u00f6rit, jotka eiv\u00e4t ole perehtyneet FR4-materiaalin ominaisuuksiin, voivat tutustua <strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/\">FR4-piirilevyjen materiaali selitettyn\u00e4<\/a><\/strong> lis\u00e4tietoja varten.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_TG_Core_Materials\"><\/span>Korkean TG-arvon omaavat ydinmateriaalit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Sovelluksissa, joissa l\u00e4mp\u00f6tilat ovat korkeammat, k\u00e4ytet\u00e4\u00e4n usein korkean TG-arvon omaavia ytimi\u00e4.<\/p><p>Etuihin kuuluvat:<\/p><ul class=\"wp-block-list\"><li>Parannettu l\u00e4mp\u00f6stabiilisuus<\/li>\n\n<li>Z-akselin laajenemisen v\u00e4heneminen<\/li>\n\n<li>Parempi luotettavuus lyijytt\u00f6m\u00e4ss\u00e4 kokoonpanossa<\/li><\/ul><p>N\u00e4it\u00e4 aineita esiintyy yleisesti:<\/p><ul class=\"wp-block-list\"><li>Autoelektroniikka<\/li>\n\n<li>Teollisuuden ohjauslaitteet<\/li>\n\n<li>S\u00e4hk\u00f6nmuunnosj\u00e4rjestelm\u00e4t<\/li>\n\n<li>Palvelimet<\/li><\/ul><p>Kuten on k\u00e4sitelty <strong><a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/\">Korkean TG-arvon FR4-piirilevy<\/a><\/strong>, korkeammat TG-arvot voivat parantaa merkitt\u00e4v\u00e4sti pitk\u00e4n aikav\u00e4lin luotettavuutta.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High-Speed_Core_Materials\"><\/span>Suurnopeusydinmateriaalit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Nykyaikaisissa viestint\u00e4laitteissa k\u00e4ytet\u00e4\u00e4n usein erityisi\u00e4 v\u00e4h\u00e4h\u00e4vi\u00f6isi\u00e4 ytimi\u00e4.<\/p><p>Esimerkkej\u00e4 ovat:<\/p><ul class=\"wp-block-list\"><li>Megtron-sarja<\/li>\n\n<li>Isola-nopeat materiaalit<\/li>\n\n<li>I-Speed-laminaatit<\/li>\n\n<li>V\u00e4h\u00e4h\u00e4vi\u00f6iset FR4-j\u00e4rjestelm\u00e4t<\/li><\/ul><p>N\u00e4m\u00e4 materiaalit auttavat s\u00e4ilytt\u00e4m\u00e4\u00e4n signaalin eheyden suurilla tiedonsiirtonopeuksilla.<\/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\/2026\/06\/PCB-Core-and-Prepreg-Materials-1.jpg\" alt=\"PCB-ydin- ja prepreg-materiaalit\" class=\"wp-image-5926\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Prepreg_Types\"><\/span>Yleisimm\u00e4t prepreg-tyypit<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Prepregit luokitellaan yleens\u00e4 lasikuitutyypin ja hartsipitoisuuden perusteella.<\/p><p>Yleisi\u00e4 lasikuitumalleja ovat muun muassa:<\/p><ul class=\"wp-block-list\"><li>106<\/li>\n\n<li>1080<\/li>\n\n<li>2113<\/li>\n\n<li>2116<\/li>\n\n<li>7628<\/li><\/ul><p>Jokaisella mallilla on erilaiset paksuus- ja hartsin ominaisuudet.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Low_Resin_Prepreg\"><\/span>V\u00e4h\u00e4hartsinen prepreg<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Tarjoukset:<\/p><ul class=\"wp-block-list\"><li>Parannettu paksuuden s\u00e4\u00e4t\u00f6<\/li>\n\n<li>Hartsin virtauksen heikkeneminen<\/li>\n\n<li>Parempi mittavakaus<\/li><\/ul><p>K\u00e4ytet\u00e4\u00e4n usein piirilevyiss\u00e4, joissa on paljon kerroksia.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_Resin_Prepreg\"><\/span>Korkeapitoinen prepreg-muovi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Sis\u00e4lt\u00e4\u00e4:<\/p><ul class=\"wp-block-list\"><li>Parempi t\u00e4ytt\u00f6kyky<\/li>\n\n<li>Parannettu tarttuvuus<\/li>\n\n<li>Suurennettu dielektrinen et\u00e4isyys<\/li><\/ul><p>K\u00e4ytet\u00e4\u00e4n yleens\u00e4 silloin, kun rakenteessa on suurempia kuparielementtej\u00e4.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Core_and_Prepreg_in_Impedance_Control\"><\/span>Ydinmateriaali ja prepreg impedanssin hallinnassa<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Ydin- ja prepreg-materiaalien yksi t\u00e4rkeimmist\u00e4 teht\u00e4vist\u00e4 on impedanssin hallinta.<\/p><p>Signaalin impedanssi riippuu seuraavista tekij\u00f6ist\u00e4:<\/p><ul class=\"wp-block-list\"><li>Dielektrisyysvakio (Dk)<\/li>\n\n<li>Kerrosten v\u00e4linen et\u00e4isyys<\/li>\n\n<li>Kuparin paksuus<\/li>\n\n<li>Geometrian j\u00e4ljitys<\/li><\/ul><p>Ytimen tai prepregin paksuus vaikuttaa suoraan signaalikerrosten ja vertailutasoiden v\u00e4liseen et\u00e4isyyteen.<\/p><p>Jopa pienet muutokset voivat vaikuttaa merkitt\u00e4v\u00e4sti kontrolloidun impedanssin arvoihin.<\/p><p>T\u00e4st\u00e4 syyst\u00e4 kerrostussuunnittelu ja materiaalien valinta on sovitettava yhteen jo projektin alkuvaiheessa.<\/p><p>Tulevissa keskusteluissa k\u00e4sitell\u00e4\u00e4n dielektrisi\u00e4 ominaisuuksia teoksessa <strong>PCB-materiaalien Dk- ja Df-arvot<\/strong>.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection_for_Multilayer_PCBs\"><\/span>Materiaalivalinta monikerroksisille piirilevyille<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Ydin- ja prepreg-materiaaleja valittaessa on otettava huomioon useita tekij\u00f6it\u00e4.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Electrical_Performance\"><\/span>S\u00e4hk\u00f6inen suorituskyky<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Sovellukset, joissa k\u00e4ytet\u00e4\u00e4n suurinopeuksisia signaaleja, edellytt\u00e4v\u00e4t vakaita dielektrisi\u00e4 ominaisuuksia.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thermal_Requirements\"><\/span>L\u00e4mp\u00f6vaatimukset<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Korkeammat k\u00e4ytt\u00f6l\u00e4mp\u00f6tilat saattavat edellytt\u00e4\u00e4 korkean TG-arvon j\u00e4rjestelmi\u00e4.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Board_Thickness\"><\/span>Levyn paksuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Ydinmateriaalin ja prepreg-yhdistelmien valinta m\u00e4\u00e4r\u00e4\u00e4 piirilevyn lopullisen paksuuden.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Capability\"><\/span>Tuotantokapasiteetti<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Tietyt materiaalit vaativat erityisi\u00e4 laminointiprofiileja ja k\u00e4sittelyvalvontaa.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cost_Considerations\"><\/span>Kustannusn\u00e4k\u00f6kohdat<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Materiaalin valinnan tulisi perustua suorituskykyvaatimuksiin sen sijaan, ett\u00e4 valittaisiin markkinoiden korkeimman tason tuote.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Challenges_During_Lamination\"><\/span>Laminoinnin aikana esiintyv\u00e4t yleiset haasteet<span class=\"ez-toc-section-end\"><\/span><\/h2><p>V\u00e4\u00e4r\u00e4 materiaalivalinta voi aiheuttaa useita valmistusongelmia.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resin_Starvation\"><\/span>Hartsin puute<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Riitt\u00e4m\u00e4t\u00f6n hartsin virtaus voi aiheuttaa onteloita tai heikkoa tarttuvuutta.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Excessive_Resin_Flow\"><\/span>Liiallinen hartsin virtaus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Liian voimakas hartsin liikkuminen voi muuttaa dielektrist\u00e4 et\u00e4isyytt\u00e4 ja vaikuttaa impedanssiin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Delamination\"><\/span>Delaminaatio<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Huono materiaalien yhteensopivuus voi johtaa kerrosten irtoamiseen l\u00e4mp\u00f6syklien aikana.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thickness_Variation\"><\/span>Paksuuden vaihtelu<span class=\"ez-toc-section-end\"><\/span><\/h3><p>V\u00e4\u00e4r\u00e4n prepregin valinta voi johtaa ep\u00e4tasaiseen valmiin levyn paksuuteen.<\/p><p>Kokeneet piirilevyvalmistajat ottavat n\u00e4m\u00e4 tekij\u00e4t huomioon kerrostusrakenteen suunnitteluvaiheessa tuotantoriskien minimoimiseksi.<\/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\/2026\/06\/PCB-Core-and-Prepreg-Materials-2.jpg\" alt=\"PCB-ydin- ja prepreg-materiaalit\" class=\"wp-image-5927\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/PCB-Core-and-Prepreg-Materials-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Material_Compatibility_Matters\"><\/span>Miksi materiaalien yhteensopivuus on t\u00e4rke\u00e4\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Ydin- ja prepreg-materiaalit hankitaan usein samalta laminaattivalmistajalta.<\/p><p>Materiaalij\u00e4rjestelmien yhteensovittaminen auttaa varmistamaan, ett\u00e4:<\/p><ul class=\"wp-block-list\"><li>Tasainen l\u00e4mp\u00f6laajeneminen<\/li>\n\n<li>Luotettava liimaus<\/li>\n\n<li>Vakaa dielektrinen suorituskyky<\/li>\n\n<li>Valmistustuoton parantaminen<\/li><\/ul><p>Yhteensopimattomien materiaalien k\u00e4ytt\u00f6 voi aiheuttaa luotettavuusongelmia tuotteen k\u00e4ytt\u00f6i\u00e4n aikana.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782354527137\"><strong class=\"schema-faq-question\">K: Mik\u00e4 ero on ydinmateriaalilla ja prepregill\u00e4?<\/strong> <p class=\"schema-faq-answer\">A: Ydinmateriaali on t\u00e4ysin kovettunut ja sen molemmilla puolilla on kuparifolio. Prepreg on osittain kovettunut ja toimii laminoinnin aikana sidoskerroksena.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782354537620\"><strong class=\"schema-faq-question\">K: Vaikuttaako prepreg impedanssiin?<\/strong> <p class=\"schema-faq-answer\">A: Kyll\u00e4. Prepregin paksuus ja dielektriset ominaisuudet vaikuttavat suoraan impedanssiarvoihin ja signaalin suorituskykyyn.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782354549057\"><strong class=\"schema-faq-question\">K: Voidaanko samassa piirilevyss\u00e4 k\u00e4ytt\u00e4\u00e4 erilaisia prepreg-materiaaleja?<\/strong> <p class=\"schema-faq-answer\">A: Kyll\u00e4. Monissa monikerroksisissa rakenteissa k\u00e4ytet\u00e4\u00e4n useita erilaisia prepreg-tyyppej\u00e4 tiettyjen paksuus- ja s\u00e4hk\u00f6isten vaatimusten t\u00e4ytt\u00e4miseksi.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782354561082\"><strong class=\"schema-faq-question\">K: Miksi prepreg-hartsin virtaus on t\u00e4rke\u00e4\u00e4?<\/strong> <p class=\"schema-faq-answer\">A: Oikea hartsin virtaus takaa kerrosten v\u00e4lisen t\u00e4ydellisen tarttuvuuden ja auttaa est\u00e4m\u00e4\u00e4n onteloiden tai kerrosten irtoamisen muodostumista.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782354575228\"><strong class=\"schema-faq-question\">K: Tarvitaanko prepregia kaikissa monikerroksisissa piirilevyiss\u00e4?<\/strong> <p class=\"schema-faq-answer\">A: Kyll\u00e4. Prepreg on v\u00e4ltt\u00e4m\u00e4t\u00f6n ydin kerrosten liitt\u00e4miseksi toisiinsa laminointiprosessin aikana.<\/p> <\/div> <\/div><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Core and prepreg materials are the building blocks of multilayer PCBs. Core materials provide structural support and electrical insulation, while prepregs bond layers together during lamination. Their thickness, dielectric properties, and resin characteristics directly affect impedance control, board reliability, manufacturing yield, and overall PCB performance.<\/p>","protected":false},"author":1,"featured_media":5928,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[486,484],"class_list":["post-5924","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcb-core","tag-pcb-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PCB Core and Prepreg Materials<\/title>\n<meta name=\"description\" content=\"PCB core and prepreg materials, their role in multilayer PCB construction, impedance control, lamination, and material selection for reliable PCB manufacturing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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