Iintlobo ezine iimaski PCB iwelding

Imaski ye-welding, ekwabizwa ngokuba yi-solder blocking mask, ngumaleko omncinci wepolymer osetyenzisiweyo Ibhodi PCB Ukuthintela amalunga e-solder ekwenzeni iiBridges. Isigqumathelo se-welding sikwathintela i-oxidation kwaye sisebenza kwimizila yobhedu kwibhodi ye-PCB.

What is PCB solder resistance type? The PCB welding mask acts as a protective coating on the copper trace line to prevent rust and prevent solder from forming Bridges that lead to short circuits. Zine iindidi eziphambili zemaski zewelding zePCB- ulwelo lwe-epoxy, ulwelo olunemifanekiso efotwayo, eyomileyo ifoto yokufota, kunye neemaski eziphezulu nasezantsi.

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Iindidi ezine zeemaski zentsimbi

Iimaski zentsimbi ziyahluka ngokwenziwa kunye nezinto eziphathekayo. Njani kwaye yeyiphi imaski yokuwelda yokusebenzisa exhomekeke kwisicelo.

Iphepha elingaphezulu nelingezantsi

Imaski ephezulu kunye esezantsi yokuwelda iinjineli ze-Elektroniki zihlala ziyisebenzisa ukubona imingxunya kuludwe lwesithintelo esiluhlaza. Uluhlu longezwa kwangaphambili yi-epoxy resin okanye iteknoloji yefilimu. Izikhonkwane zento zenziwe nge welding kwibhodi kusetyenziswa ukuvulwa okubhalisiweyo kwimask.

The conductive trace pattern on the top of the circuit board is called the top trace. Ngokufana nesigqubuthelo secala eliphezulu, imaski esezantsi esezantsi isetyenziswa kwicala elingasemva lebhodi yesekethe.

I-epoxy liquid solder mask

Epoxy resins are the cheapest alternative to welding masks. Epoxy is a polymer that is screen printed on a PCB. Yoshicilelo Screen yinkqubo yoshicilelo esebenzisa umnatha ngelaphu ukuxhasa ipateni uvimba ipeyinti. The grid allows identification of open areas for ink transfer. In the final step of the process, heat curing is used.

Ulwelo lwe-imaging ye-imaging solder

Iimaski zokufotokopa okumanzi, okwaziwa ngokuba yi-LPI, ngokwenene ngumxube wezinto ezimbini ezingamanzi. Liquid components are mixed prior to application to ensure a longer shelf life. It is also one of the more economical of the four different PCB solder resistance types.

I-LPI inokusetyenziselwa ukuprinta kwescreen, ukupeyinta isikrini okanye usetyenziso lokutshiza. The mask is a mixture of different solvents and polymers. Ngenxa yoko, ukutyiwa okubhityileyo kungatsalwa okuhambelana nomphezulu wommandla ekujoliswe kuwo. Le maski yenzelwe ukuhambisa iimaski, kodwa i-PCB ayifuni nayiphi na into yokugquma yokugqibela efumanekayo namhlanje.

Ngokuchasene nee-inks ezindala ze-epoxy, i-LPI inovakalelo kukukhanya kwe-ultraviolet. Iphaneli kufuneka igutyungelwe ngemaski. Emva komjikelo omfutshane “wokunyanga”, ibhodi ivezwe kukukhanya kwe-ultraviolet isebenzisa ifotolithoithoyitha okanye i-laser ye-ultraviolet.

Before applying the mask, the panel should be cleaned and free of oxidization. Oku kwenziwa ngoncedo lwezisombululo ezikhethekileyo zemichiza. Oku kunokwenziwa kusetyenziswa isisombululo se-alumina okanye ngokukhuhla iipaneli ngelitye elirhoxisiweyo lepumice.

One of the most common ways to expose panel surfaces to UV is by using contact printers and film tools. The top and bottom sheets of the film are printed with an emulsion to block the area to be welded. Use the tools on the printer to fix the production panel and film in place. The panels were then simultaneously exposed to an ULTRAVIOLET light source.

Enye indlela isebenzisa ii-lasers ukwenza imifanekiso ethe ngqo. But in this technique, no film or tools are needed because the laser is controlled using a reference mark on the panel’s copper template.

Iimaski ze-LPI zifumaneka kwimibala eyahlukeneyo, kubandakanya uluhlaza (matte okanye semi-gloss), mhlophe, luhlaza okwesibhakabhaka, bomvu, tyheli, mnyama, nokunye. Umzi mveliso we-LED kunye nokusetyenziswa kwelaser kwimveliso ye-elektroniki kukhuthaza abavelisi kunye nabaqulunqi ukuba baphuhlise izinto ezimhlophe nezimnyama ezomeleleyo.

Ifilimu eyomileyo yokufota ifoto yokuthengisa

A dry film photoimagable welding mask is used, and vacuum lamination is used. Ifilimu eyomileyo iyavezwa kwaye iphuhliswe. After the film is developed, openings are positioned to produce patterns. Emva koko, i-elementi ifakwe nge-welding kwi-brazing pad. Ubhedu laminishwe kwibhodi yesekethe kusetyenziswa inkqubo ye-electrochemical.

Ubhedu lubekiwe emngxunyeni nakwindawo yokulandelela. I-Tin ekugqibeleni yasetyenziselwa ukunceda ukukhusela iisekethe zobhedu. In the final step, the membrane is removed and the etching mark is exposed. Le ndlela isebenzisa ukuphilisa ubushushu.

Dry film welding masks are commonly used for high-density patch boards. Ngenxa yoko, ayithululeli kumngxunya ophume kuyo. These are some of the positives of using a dry film welding mask.

Ukuthatha isigqibo sokuba yeyiphi imaski yokuhambisa oza kuyisebenzisa kuxhomekeke kwizinto ezahlukeneyo-kubandakanya ubungakanani bePCB, isicelo sokugqibela ekufuneka sisetyenzisiwe, imingxunya, izinto eziza kusetyenziswa, abaqhubi, ubume bomhlaba, njl.

Uninzi loyilo lwangoku lwe-PCB lunokufumana iifoto zokumelana nemifanekiso. Therefore, it is either LPI or dry film resistance film. The surface layout of the board will help you determine your final choice. If the surface topography is not uniform, the LPI mask is preferred. If a dry film is used on uneven terrain, gas may be trapped in the space formed between the film and the surface. Therefore, LPI is more suitable here.

Nangona kunjalo, kukho izinto ezisezantsi zokusebenzisa iLPI. Its comprehensiveness is not uniform. You can also get different finishes on the mask layer, each with its own application. For example, in cases where solder reflow is used, the matte finish will reduce solder balls.

Build solder masks into your design

Ukwakha ifilimu yokumelana nefilimu kuyilo lwakho kubalulekile ukuqinisekisa ukuba ukusetyenziswa kwemaski kukwinqanaba elifanelekileyo. When designing a circuit board, the welding mask should have its own layer in the Gerber file. In general, it is recommended to use a 2mm border around the function in case the mask is not fully centered. Kuya kufuneka ushiye ubuncinci be-8mm phakathi kweepads ukuqinisekisa ukuba iibhlorho azenzi.

Thickness of welding mask

Thickness Welding mask will depend on the thickness of the copper trace on the board. Ngokubanzi, imaski ye-0.5mm ye-welding ikhethwa ukufihla imigca yokulandela umkhondo. If you are using liquid masks, you must have different thicknesses for different features. Iindawo ezingenanto ezingenanto zinokuba nobunzima be-0.8-1.2mm, ngelixa iindawo ezinempawu ezinzima ezifana namadolo ziya kuba nezandiso ezincinci (malunga ne-0.3mm).

siphelo

Isishwankathelo, uyilo lwesigqumathelo se-welding lunefuthe elibi ekusebenzeni kwesicelo. Idlala indima ebalulekileyo ekuthinteleni i-rust kunye ne-welding Bridges, ezinokukhokelela kwiisekethi ezimfutshane. Ke ngoko, isigqibo sakho kufuneka sithathele ingqalelo izinto ezahlukeneyo ezichazwe kweli nqaku. Ndiyathemba ukuba eli nqaku linokukunceda uqonde ngcono i-TYPE yefilimu yokumelana ne-PCB. Ukuba unayo nayiphi na imibuzo, okanye ufuna nje ukunxibelelana nathi, sihlala sonwabile ukukunceda.