Kuwotcha kwa zinthu, zomwe zimadziwikanso kuti retardancy yamoto, kuzimitsa zokha, kukana lawi, kukana moto, kukana moto, kuyaka ndi kuyaka kwina, ndikuwunika kuthekera kwa zinthuzo kukana kuyaka.

Chitsanzo cha zinthu zoyaka moto chimayatsidwa ndi lawi lomwe limakwaniritsa zofunikira, ndipo lawilo limachotsedwa pambuyo pa nthawi yodziwika.Mlingo woyaka moto umawunikidwa molingana ndi kuchuluka kwa kuyaka kwachitsanzo.Pali magawo atatu.Njira yoyesera yopingasa yachitsanzo imagawidwa mu FH1, FH2, FH3 mlingo wachitatu, njira yoyesera yowonekera imagawidwa mu FV0, FV1, VF2.
Cholimba Chithunzi cha PCB lagawidwa HB bolodi ndi V0 bolodi.

Tsamba la HB lili ndi mphamvu yocheperako yamoto ndipo limagwiritsidwa ntchito kwambiri pama board ambali imodzi.VO board ili ndi vuto lalikulu lamoto.Amagwiritsidwa ntchito kwambiri pama board amitundu iwiri komanso amitundu yambiri omwe amakwaniritsa zofunikira zoyezera moto wa V-1.Mtundu uwu wa bolodi PCB amakhala FR-4 bolodi.V-0, V-1, ndi V-2 ndi magiredi osayaka moto.

Bolodi lozungulira liyenera kukhala lopanda moto, silingatenthe pa kutentha kwina, koma limatha kufewetsa.Kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg point), ndipo mtengo uwu umagwirizana ndi kukhazikika kwa bolodi la PCB.

Kodi bolodi lalitali la Tg PCB ndi chiyani komanso ubwino wogwiritsa ntchito Tg PCB yapamwamba?
Pamene kutentha kwapamwamba Tg yosindikizidwa board ikukwera kudera linalake, gawo lapansi lidzasintha kuchokera ku "galasi state" kupita ku "rabara state".Kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg) pa bolodi.Mwa kuyankhula kwina, Tg ndiye kutentha kwambiri komwe gawo lapansi limakhala lolimba.

Kodi mitundu yeniyeni ya matabwa a PCB ndi chiyani?
Agawikana ndi giredi kuyambira pansi mpaka pamwamba motere:

94HB - 94VO - 22F - CEM-1 - CEM-3 - FR-4 akufotokozedwa mwatsatanetsatane motere: 94HB: makatoni wamba, osati moto (zotsika kwambiri kalasi, kufa punching, sangathe kugwiritsidwa ntchito ngati bolodi mphamvu) 94V0: makatoni obwezeretsanso malawi (Kukhomerera nkhungu) 22F: Bolodi ya fiberglass yambali imodzi (kugunda kufa) CEM-1: bolodi la fiberglass lokhala mbali imodzi (liyenera kubowoleredwa ndi kompyuta, osamwalira kukhomerera) CEM-3: Bolodi lokhala ndi mbali ziwiri la fiberglass ( Kupatulapo mbali ziwiri za Cardboard ndiye chinthu chotsikitsitsa kwambiri cha matabwa a mbali ziwiri. Ma board osavuta am'mbali-awiri amatha kugwiritsa ntchito zinthuzi, zomwe ndi zotsika mtengo 5~10 yuan/square mita kuposa FR-4.)

FR-4: bolodi la fiberglass yokhala ndi mbali ziwiri

Bolodi lozungulira liyenera kukhala lopanda moto, silingatenthe pa kutentha kwina, koma limatha kufewetsa.Kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg point), ndipo mtengo uwu umagwirizana ndi kukhazikika kwa bolodi la PCB.

Kodi bolodi lalitali la Tg PCB ndi chiyani komanso ubwino wogwiritsa ntchito Tg PCB yapamwamba?

Kutentha kumakwera kudera linalake, gawo lapansi lidzasintha kuchokera ku "galasi" kupita ku "rubbery", ndipo kutentha panthawiyi kumatchedwa kutentha kwa galasi (Tg) ya mbale.Mwa kuyankhula kwina, Tg ndiye kutentha kwambiri (°C) komwe gawo lapansi limakhala lolimba.

Ndiko kunena kuti, wamba PCB gawo lapansi zipangizo osati kutulutsa softening, mapindikidwe, kusungunuka ndi zochitika zina pa kutentha kwambiri, komanso kusonyeza kuchepa kwambiri mawotchi ndi magetsi makhalidwe (Ndikuganiza kuti simukufuna kuona gulu la matabwa PCB ndikuwona izi pazogulitsa zanu. ).

Mbale wamba wa Tg ndi wopitilira madigiri 130, Tg yapamwamba nthawi zambiri imakhala yopitilira madigiri 170, ndipo sing'anga Tg imakhala pafupifupi madigiri 150.

Kawirikawiri matabwa a PCB osindikizidwa ndi Tg ≥ 170 ° C amatchedwa mapepala apamwamba a Tg osindikizidwa.Pamene Tg ya gawo lapansi ikuwonjezeka, kukana kutentha, kukana chinyezi, kukana kwa mankhwala, kukhazikika ndi zizindikiro zina za bolodi losindikizidwa zidzakonzedwa bwino ndikusintha.Kukwera kwa mtengo wa TG, kumakhala bwino kukana kutentha kwa bolodi, makamaka m'njira yopanda chitsogozo, pomwe ntchito zapamwamba za Tg ndizofala kwambiri.

High Tg imatanthauza kukana kutentha kwakukulu.Ndi chitukuko chofulumira cha mafakitale a zamagetsi, makamaka zinthu zamagetsi zomwe zimayimiridwa ndi makompyuta, kukula kwa magwiridwe antchito apamwamba komanso ma multilayer apamwamba kumafuna kukana kwa kutentha kwambiri kwa zinthu zam'munsi za PCB monga chitsimikizo chofunikira.Kuwonekera ndi chitukuko cha matekinoloje okwera kwambiri omwe amaimiridwa ndi SMT ndi CMT apangitsa ma PCB kukhala osasiyanitsidwa ndi chithandizo cha kutentha kwakukulu kwa magawo ang'onoang'ono pogwiritsira ntchito kabowo kakang'ono, waya wabwino, ndi kupatulira.

Choncho, kusiyana pakati pa FR-4 ndi Tg FR-4 yapamwamba: imakhala yotentha, makamaka pambuyo pa kuyamwa kwa chinyezi.
Pansi pa kutentha, pali kusiyana kwa mphamvu zamakina, kukhazikika kwa mawonekedwe, kumamatira, kuyamwa kwa madzi, kuwonongeka kwa kutentha, ndi kuwonjezereka kwa kutentha kwa zipangizo.Zogulitsa zapamwamba za Tg ndizabwinoko kuposa zida wamba za PCB.M'zaka zaposachedwapa, chiwerengero cha makasitomala omwe akufuna kupanga mapepala apamwamba a Tg chawonjezeka chaka ndi chaka.

Ndi chitukuko ndi mosalekeza luso lamagetsi, zofunika zatsopano nthawi zonse kuperekedwa kwa kusindikizidwa dera gulu gawo lapansi zipangizo, potero kulimbikitsa chitukuko mosalekeza wa mfundo mkuwa atavala laminate.Pakalipano, mfundo zazikuluzikulu za substrate zipangizo ndi izi.

① Miyezo Yadziko Pakali pano, mikhalidwe ya dziko langa pakugawika kwa zida za PCB pazinthu zapansi panthaka ikuphatikizapo GB/T4721-47221992 ndi GB4723-4725-1992.The copper clad laminate muyezo ku Taiwan, China ndi CNS muyezo, amene zachokera Japanese JIs muyezo., Yotulutsidwa mu 1983.
②Miyezo ina yadziko ndi: Miyezo ya Japan JIS, American ASTM, NEMA, MIL, IPc, ANSI, UL miyezo, British Bs miyezo, German DIN ndi VDE miyezo, French NFC ndi UTE miyezo, ndi Canadian CSA Standards, AS miyezo Australia, FOCT miyezo mu Soviet Union wakale, mayiko IEC miyezo, etc.

Otsatsa zida zoyambira za PCB ndizodziwika komanso zimagwiritsidwa ntchito: Shengyi \ Jiantao \ International, etc.

● Zikalata zovomerezeka: protel autocad powerpcb orcad gerber kapena bolodi lenileni lakope, ndi zina zotero.

● Mitundu ya bolodi: CEM-1, CEM -3 FR4, zinthu zapamwamba za TG;

● Kukula kwakukulu kwa bolodi: 600mm*700mm (24000mil*27500mil)

● Makulidwe a bolodi: 0.4mm-4.0mm (15.75mil-157.5mil)

● Magawo apamwamba kwambiri opangira: 16Layers

● Chojambula chamkuwa Kukhuthala: 0.5-4.0 (oz)

● Anamaliza bolodi makulidwe kulolerana: +/-0.1mm (4mil)

● Kupanga dimension kulolerana: mphero kompyuta: 0.15mm (6mil) Die punching mbale: 0.10mm (4mil)

● Mzere wocheperako m'lifupi/mipata :0.1mm(4mil) Kutha kuwongolera m'lifupi: <+-20%

● Bowo loboola laling'ono lazinthu zomalizidwa: 0.25mm (10mil) Bowo losachepera lobowola la chinthu chomalizidwa: 0.9mm (35mil) Kulekerera kwa dzenje lomalizidwa: PTH: +-0.075mm(3mil) NPTH -0.05mm (2mil)

● Anamaliza dzenje khoma mkuwa makulidwe: 18-25um (0.71-0.99mil)

● Mipata yocheperako ya SMT: 0.15mm (6mil)

● Kupaka pamwamba: golide womiza mankhwala, utsi wa malata , Bolodi lonse ndi golide wokutidwa ndi faifi (madzi/golide wofewa), guluu wabuluu wa silk screen, etc.

● Makulidwe a chigoba cha solder pa bolodi: 10-30μm (0.4-1.2mil)

● Kuchucha mphamvu: 1.5N/mm (59N/mil)

● Resistance Solder film hardness: > 5H

● Solder kukana pulagi dzenje mphamvu: 0.3-0.8mm (12mil-30mil)

● Dielectric yosasintha: ε = 2.1-10.0

● Insulation resistance: 10KΩ-20MΩ

● Kulephera kwakhalidwe: 60 ohm±10%

● Kutentha kwa kutentha: 288℃, 10 sec

● Warpage wa bolodi yomalizidwa: <0.7%

● Kugwiritsa ntchito mankhwala: zida zoyankhulirana, zamagetsi zamagalimoto, zida, makina oyika padziko lonse lapansi, kompyuta, MP4, magetsi, zida zapanyumba, ndi zina.

Malinga ndi PCB board reinforcement zida, nthawi zambiri amagawidwa m'mitundu iyi:
1. Phenolic PCB pepala gawo lapansi
Chifukwa mtundu uwu wa bolodi PCB wapangidwa pepala zamkati, matabwa zamkati, etc., nthawi zina amakhala makatoni, V0 bolodi, lawi-retardant bolodi ndi 94HB, etc. nkhani yake yaikulu ndi nkhuni zamkati CHIKWANGWANI pepala, amene ndi mtundu wa PCB opangidwa ndi phenolic resin pressure.mbale.Mtundu woterewu wa pepala sangawotchedwe ndi moto, ukhoza kukhomeredwa, umakhala ndi mtengo wotsika, wotsika mtengo, komanso kachulukidwe kakang'ono.Nthawi zambiri timawona magawo a mapepala a phenolic monga XPC, FR-1, FR-2, FE-3, ndi zina zotero. Ndipo 94V0 ndi ya pepala loletsa moto, lomwe silingayaka moto.

2. Gulu la PCB gawo lapansi
Mtundu uwu wa bolodi wa ufa umatchedwanso bolodi la ufa, wokhala ndi matabwa a matabwa a fiber fiber kapena thonje zamkati za fiber fiber monga zinthu zolimbikitsira, ndi nsalu zamagalasi zopangira zinthu zolimbitsa nthawi imodzi.Zida ziwirizi zimapangidwa ndi resin-retardant epoxy resin.Pali mbali imodzi ya theka lagalasi fiber 22F, CEM-1 ndi iwiri mbali ziwiri theka galasi CHIKWANGWANI CHIKWANGWANI bolodi CEM-3, pakati CEM-1 ndi CEM-3 ndi ambiri kompositi mkuwa clad laminates.

3. Galasi CHIKWANGWANI PCB gawo lapansi
Nthawi zina zimakhalanso epoxy bolodi, galasi CHIKWANGWANI bolodi, FR4, CHIKWANGWANI bolodi, etc. Amagwiritsa ntchito epoxy utomoni monga zomatira ndi galasi CHIKWANGWANI nsalu monga kulimbikitsa zakuthupi.Mtundu uwu wa bolodi wozungulira uli ndi kutentha kwakukulu kogwira ntchito ndipo sikukhudzidwa ndi chilengedwe.Mtundu uwu wa bolodi amagwiritsidwa ntchito pawiri-mbali PCB, koma mtengo ndi okwera mtengo kuposa gulu PCB gawo lapansi, ndi makulidwe wamba ndi 1.6MM.Mtundu uwu wa gawo lapansi ndi woyenera matabwa osiyanasiyana magetsi, matabwa apamwamba mlingo, ndipo chimagwiritsidwa ntchito makompyuta, zipangizo zotumphukira, ndi zipangizo kulankhulana.

FR-4

4. Zina