Feem ntau, thawj xaiv cov pawg loj ntawm cov tshuaj txhuam hniav, thiab tom qab ntawd xaiv raws li cov alloy muaj pes tsawg leeg, granularity, viscosity thiab lwm yam ntsuas.
I. Classification txoj kev
A. Ordinary rosin tu hom RA thiab RMA. Qhov no hom ntawm solder paste nyob rau hauv cov txheej txheem soldering qhia tau hais tias ib tug zoo dua "tin ceev" thiab muaj peev xwm ua kom zoo "welding effect". Tom qab ua tiav ntawm kev ua haujlwm vuam, PCB nto rosin residue yog qhov loj, tuaj yeem ntxuav nrog tus neeg saib xyuas tsim nyog, ntxuav lub rooj tsavxwm tsis muaj qhov seem, kom ntseeg tau tias kev ntxuav ntawm lub rooj tsavxwm muaj cov rwb thaiv tsev zoo, thiab tuaj yeem dhau. ntau yam ntawm cov khoom siv hluav taws xob ntawm kev kuaj xyuas.
B. Tsis-huv hom solder paste NC: qhov muab tshuaj txhuam no ua tiav, PCB board nto yog huv dua, tsis tshua muaj residue, tuaj yeem dhau ntau yam khoom siv hluav taws xob ntawm kev sim, tsis tas yuav ntxuav dua, txhawm rau xyuas kom meej. qhov zoo ntawm cov vuam tib lub sij hawm kom luv cov txheej txheem ntau lawm, ua kom lub sij hawm ntau lawm.
C. Dej-soluble solder paste WMA: thaum ntxov ntawm solder paste rau cov laj thawj kev, PCB board nto residue feem ntau dhau lawm, cov khoom hluav taws xob tsis zoo, cuam tshuam rau cov khoom zoo. Lub sijhawm ntawd, CFC ntau dua los ntxuav, vim tias CFC tsis zoo rau ib puag ncig, ntau lub tebchaws raug txwv. Txhawm rau ua kom tau raws li kev xav tau ntawm kev ua lag luam, yuav tsum tsim cov dej-soluble solder paste, qhov no paste soldering ua tiav tom qab nws cov residue tuaj yeem ntxuav nrog dej, tsis tsuas yog txo tus neeg siv khoom cov nqi tsim khoom, tab sis kuj ua raws li cov cai ntawm kev tiv thaiv ib puag ncig. .
II. Cov txheej txheem xaiv
1. Alloy muaj pes tsawg leeg
Feem ntau, Sn63 / Pb37 solder alloy muaj peev xwm ua tau raws li qhov xav tau ntawm vuam.
Rau cov nyiaj (Ag) lossis palladium (Pd) plating ntaus ntawv vuam, feem ntau xaiv cov alloy muaj pes tsawg leeg ntawm Sn62 / Pb36 / Ag2 solder paste.
Rau PCB vuam ntawm cov khoom siv hluav taws xob tiv thaiv hluav taws xob xaiv cov hmoov solder uas muaj Bi.
2. Lub viscosity ntawm solder paste
HauvSMT reflow qhov cub, vim hais tias los ntawm laser stencil luam ntawv (los yog taw tes ntawm kev ceeb toom) tom qab muab tshuaj txhuam thiab muab tshuaj txhuam rau ntawm cov khoom, kom xa mus rau hauv cov txheej txheem reflow cua sov, nyob rau hauv nruab nrab ntawm cov txheej txheem ntawm tsiv, tso los yog tuav PCB. Nyob rau hauv cov txheej txheem no txhawm rau kom ntseeg tau tias tau luam tawm (los yog taw tes zoo) solder paste tsis deformed, tau muab tso rau hauv PCB solder paste rau ntawm cov khoom tsis hloov, yog li qhov yuav tsum tau ua ntawm solder paste hauv PCB rau hauv reflow. cua sov ua ntej, yuav tsum muaj adhesion zoo thiab tuav lub sijhawm.
A. rau qib ntawm adhesion ntawm solder paste ntsuas feem ntau siv "Pa - S" rau chav tsev qhia. Ib qho ntawm 200-600Pa-S solder paste yog qhov tsim nyog rau koob txhaj tshuaj lossis qib siab dua ntawm automation ntawm cov khoom siv txheej txheem ntau lawm. Cov txheej txheem luam ntawv yuav tsum muaj cov viscosity siab ntawm cov muab tshuaj txhuam, yog li cov tshuaj muab tshuaj siv rau kev luam ntawv txheej txheem viscosity feem ntau yog nyob rau hauv 600-1200 Pa-S los yog li ntawd, haum rau phau ntawv los yog mechanical patch stencil printing.
B. High-viscosity solder paste muaj cov txiaj ntsig zoo ntawm cov pob qij txha ntawm cov pob qij txha mus rau hauv pawg pawg thiab lwm yam ntxwv, tsim nyog rau kev luam ntawv zoo. Thiab tsis tshua muaj viscosity solder paste nyob rau hauv cov luam ntawv muaj qhov poob sai dua, cov cuab yeej tsis txhuam, txuag lub sijhawm.
C. Lwm qhov feature ntawm paste viscosity yog: nws viscosity yuav hloov nrog qhov sib tov ntawm paste, nyob rau hauv kev sib xyaw ntawm nws viscosity yuav raug txo. Thaum nres stirring me ntsis tom qab so, nws viscosity yuav rov qab mus rau nws lub qub qub. Qhov no yog qhov tseem ceeb heev rau yuav ua li cas xaiv cov viscosity sib txawv ntawm solder paste.
Tsis tas li ntawd, qhov viscosity ntawm cov muab tshuaj txhuam thiab qhov kub thiab txias muaj kev sib raug zoo, feem ntau, nws cov viscosity yuav maj mam txo thaum qhov kub nce.
3. Mesh
Lub tswvyim ntawm "mesh" yog siv los categorize txawv solder pastes. Mesh yog lub ntsiab lus tseem ceeb ntawm tus naj npawb ntawm qhov ib square inch ntawm qhov screen. Nyob rau hauv qhov tseeb tin hmoov txheej txheem ntau lawm, feem ntau ntawm cov tshuaj ntsuam nrog ob peb txheej sib txawv mesh los sau tin hmoov, vim hais tias txhua txheej ntawm cov tshuaj ntsuam mesh loj yog txawv, yog li los ntawm txhua txheej ntawm cov mesh ntawm tin hmoov particle loj tsis yog tus. tib yam, qhov kawg sau ntawm tin hmoov hais, nws cov particle loj kuj yog ib cheeb tsam tus nqi.
los ntawm cov ntsiab lus saum toj no, qhov loj dua qhov muab tshuaj txhuam mesh Performance index, qhov me me ntawm txoj kab uas hla ntawm cov hmoov tin hmoov nyob rau hauv paste. Thiab thaum tus naj npawb mesh me dua, nws txhais tau hais tias qhov loj dua cov khoom ntawm cov hmoov tin hauv cov tshuaj txhuam hniav.
Yog tias kev siv cov khoom siv tshuaj txhuam cov khoom lag luam raws li tus naj npawb ntawm solder paste mesh index xaiv ntawm solder paste, yuav tsum ua raws li qhov kev ncua deb ntawm qhov tsawg tshaj plaws ntawm PCB los txiav txim qhov sib nrug ntawm cov ntsiab lus soldering: yog tias muaj qhov sib txawv loj dua, koj tuaj yeem xaiv mesh me me ntawm solder paste, thiab vice versa, uas yog, thaum qhov sib nrug ntawm cov ntsiab lus soldering me dua, nws yuav tsum tau xaiv rau mesh ib tug loj ntawm solder paste. Kev xaiv dav dav ntawm particle loj txoj kab uas hla ntawm li 1/5 ntawm SMT stencil qhib.
Tuam txhab Profile
Zhejiang NeoDen Technology Co., Ltd. tau raug tsim thiab xa tawm ntau yam me me thiab qhov chaw tshuab txij li xyoo 2010. Ua kom zoo dua ntawm peb tus kheej muaj kev paub txog R&D, kev cob qhia zoo, NeoDen yeej lub koob npe nrov los ntawm cov neeg siv khoom thoob ntiaj teb.
nrog lub ntiaj teb muaj nyob hauv ntau dua 130 lub teb chaws, kev ua tau zoo heev, qhov raug siab thiab kev ntseeg siab ntawm NeoDen PNP cov cav tov ua rau lawv zoo meej rau R & D, kev tshaj lij prototyping thiab me me rau nruab nrab batch ntau lawm. Peb muab kev daws teeb meem ntawm ib qho khoom siv SMT nres.
Peb ntseeg hais tias cov neeg zoo thiab cov neeg koom tes ua rau NeoDen yog ib lub tuam txhab zoo thiab tias peb txoj kev cog lus rau Innovation, Diversity thiab Sustainability kom ntseeg tau tias SMT automation yog siv tau rau txhua tus neeg nyiam nyiam nyob txhua qhov chaw.