Ts'ebetsong eaPCBtlhahiso, tlhahiso ea aStencil ea tšepe (eo hape e tsejoang e le "stencil")e etsoa ho sebelisa ka nepo peista ea solder holim'a lera la solder peista ea PCB.The solder paste layer, eo hape e bitsoang "paste mask layer," ke karolo ea faele ea moralo ea PCB e sebelisetsoang ho hlalosa maemo le libopeho tsa eona.peista ea solder.Lera lena le bonahala pele hoTheknoloji ea holim'a metsi (SMT)likarolo li soldered holim'a PCB, ho bontša moo solder peista lokela ho behoa.Nakong ea ts'ebetso ea solder, stencil ea tšepe e koahela lera la peista ea solder, 'me solder paste e sebelisoa hantle holim'a liphahlo tsa PCB ka likoti tse holim'a stencil, ho netefatsa hore ho na le soldering e nepahetseng nakong ea ts'ebetso ea ho kopanya karolo e latelang.
Ka hona, lera la peista ea solder ke ntho ea bohlokoa ho hlahisa stencil ea tšepe.Mekhahlelong ea pele ea tlhahiso ea PCB, tlhahisoleseling e mabapi le lera la peista ea solder e romelloa ho moetsi oa PCB, ea hlahisang stencil ea tšepe e ts'oanang ho netefatsa ho nepahala le ho ts'epahala ha ts'ebetso ea solder.
Moqaping oa PCB (Printed Circuit Board), "pastemask" (eo hape e tsejoang e le "mask paste ea solder" kapa "mask ea solder") ke lera la bohlokoa.E phetha karolo ea bohlokoa ts'ebetsong ea soldering bakeng sa ho kopanyalisebelisoa tsa holim'a metsi (SMDs).
Mosebetsi oa stencil ea tšepe ke ho thibela pente ea solder hore e se ke ea sebelisoa libakeng tseo ho tsona ho sa lokelang ho etsahala ha ho soasoa likarolo tsa SMD.Solder paste ke lintho tse sebelisoang ho hokahanya likarolo tsa SMD ho li-pads tsa PCB, 'me sethala sa pasmask se sebetsa e le "thibelo" ho netefatsa hore peista ea solder e sebelisoa feela libakeng tse itseng tsa soldering.
Moralo oa lera la pasmask o bohlokoa haholo ts'ebetsong ea tlhahiso ea PCB kaha e ama ka kotloloho boleng ba ho soasoa le ts'ebetso e akaretsang ea likarolo tsa SMD.Nakong ea moralo oa PCB, baqapi ba hloka ho nahana ka hloko sebopeho sa lera la pasmask, ho etsa bonnete ba hore se tsamaisana le likarolo tse ling, joalo ka lera la pad le karolo ea likarolo, ho netefatsa ho nepahala le ho ts'epahala ha ts'ebetso ea soldering.
Litlhaloso tsa Moqapi bakeng sa Lera la Mask la Solder (Stencil ea tšepe) ho PCB:
Ka moralo oa PCB le tlhahisong, litlhaloso tsa ts'ebetso bakeng sa Solder Mask Layer (eo hape e tsejoang e le Steel Stencil) hangata e hlalosoa ke maemo a indasteri le litlhoko tsa moetsi.Mona ke lintlha tse ling tse tloaelehileng tsa moralo bakeng sa Solder Mask Layer:
1. IPC-SM-840C: Ena ke tekanyetso ea Solder Mask Layer e thehiloeng ke IPC (Association Connecting Electronics Industries).Tekanyetso e hlalosa ts'ebetso, litšobotsi tsa 'mele, ho tšoarella, botenya, le litlhoko tsa ho rekisoa bakeng sa mask a solder.
2. Mmala le Mofuta: Mask ea solder e ka tla ka mefuta e fapaneng, joalo kaMocheso oa Solder Leveling (HASL) or Khauta ea ho qoelisoa ka Nickel e se Nang Motlakase(ENIG), 'me mefuta e fapaneng e ka ba le litlhoko tse ikhethileng tse boletsoeng.
3. Ho koaheloa ha Solder Mask Layer: Lera la mask la solder le lokela ho koahela libaka tsohle tse hlokang ho rekisoa ha likaroloana, ha ho ntse ho netefatsa tšireletso e nepahetseng ea libaka tse sa lokelang ho rekisoa.Lera la mask la solder le lona le lokela ho qoba ho koahela libaka tse hokahaneng kapa matshwao a skrineng sa silika.
4. Ho hlaka ha Solder Mask Layer: Lera la mask la solder le lokela ho ba le ho hlaka hantle ho netefatsa ponahalo e hlakileng ea mathōko a li-solder pads le ho thibela solder paste hore e se ke ea phalla libakeng tse sa batleheng.
5. Botenya ba Lera la Mask la Solder: Botenya ba lera la mask ea solder bo lokela ho lumellana le litlhoko tse tloaelehileng, hangata ka har'a sebaka sa mashome a 'maloa a micrometer.
6. Ho Qoba Pin: Likarolo tse ling tse khethehileng kapa lithakhisa li ka 'na tsa hloka ho lula li pepesitsoe lera la mask ea solder ho fihlela litlhoko tse khethehileng tsa ho soasoa.Maemong a joalo, litlhaloso tsa mask a solder li ka hloka ho qoba ts'ebeliso ea mask a solder libakeng tseo tse ikhethileng.
Ho lumellana le litlhaloso tsena ho bohlokoa ho netefatsa boleng le ho nepahala ha lera la mask a solder, kahoo ho ntlafatsa sekhahla sa katleho le ho tšepahala ha tlhahiso ea PCB.Ho feta moo, ho latela lintlha tsena ho thusa ho ntlafatsa ts'ebetso ea PCB le ho netefatsa kopano e nepahetseng le ho rekisoa ha likarolo tsa SMD.Ho sebelisana le moetsi le ho latela litekanyetso tse amehang nakong ea ts'ebetso ea moralo ke mohato oa bohlokoa ho netefatsa boleng ba lera la stencil ea tšepe.
Nako ea poso: Aug-04-2023
