Kuchita kwa PCB zidzakhudzidwa ndi zinthu zambiri zakunja kapena zachilengedwe, monga chinyezi, kutentha kwambiri, kupopera mchere ndi mankhwala. Chophimba choteteza ndi filimu ya polima yokutidwa pamwamba pa PCB kuteteza PCB ndi zigawo zake ku dzimbiri ndi kuipitsa chilengedwe.

Poletsa kukhudzidwa kwa zonyansa ndi zinthu zachilengedwe, chophimba chotetezacho chingalepheretse kuwonongeka kwa ma conductor, ma solder ndi mizere. Kuphatikiza apo, imathanso kutenga nawo gawo pakutchinjiriza, potero kuchepetsa kupsinjika kwa kutentha ndi makina pazigawo.

Zovala zodzitchinjiriza ndi gawo lofunikira la matabwa osindikizidwa. Kuchuluka kwake kumakhala pakati pa 3-8 mils (0.075-0.2 mm). Amagwiritsidwa ntchito kwambiri muzamlengalenga, magalimoto, zankhondo, zam’madzi, zowunikira, zamagetsi ogula ndi mafakitale ogulitsa.

Mitundu ya zokutira zoteteza za PCB

Malinga ndi kapangidwe kake, zotchingira zoteteza zitha kugawidwa m’mitundu isanu, yomwe ndi acrylic, epoxy, polyurethane, silicone ndi p-xylene. Kusankhidwa kwa zokutira kwapadera kumatengera kugwiritsa ntchito kwa PCB komanso zofunikira zamagetsi. Pokhapokha posankha zipangizo zoyenera PCB ingatetezedwe bwino.

Chophimba Choteteza Acrylic:

Acrylic resin (AR) ndi polymer ya acrylic preformed yomwe imasungunuka mu zosungunulira ndikugwiritsidwa ntchito kutikita pamwamba pa PCB. Zovala zotetezera za Acrylic zimatha kupukutidwa ndi dzanja, kupopera kapena kuviika mu zokutira za acrylic resin. Ichi ndiye chotchingira choteteza chomwe chimagwiritsidwa ntchito kwambiri pa PCB.

Polyurethane chitetezo zokutira:

Chophimba cha polyurethane (UR) chili ndi chitetezo chabwino kwambiri ku zotsatira za mankhwala, chinyezi ndi abrasion. Zovala zoteteza za polyurethane (UR) ndizosavuta kugwiritsa ntchito koma zovuta kuzichotsa. Sitikulimbikitsidwa kukonza mwachindunji ndi kutentha kapena chitsulo chosungunula, chifukwa chidzatulutsa mpweya wa poizoni isocyanate.

Epoxy resin (mtundu wa ER):

Epoxy resin ili ndi mawonekedwe abwino kwambiri osunga mawonekedwe m’malo ovuta. Ndiosavuta kugwiritsa ntchito, koma idzawononga dera likamachotsedwa. Epoxy resin nthawi zambiri imakhala yosakaniza magawo awiri a thermosetting. Mankhwala a gawo limodzi amachiritsidwa ndi kutentha kapena cheza cha ultraviolet.

Silicone (mtundu wa SR):

Zovala zotetezera za silicone (mtundu wa SR) zimagwiritsidwa ntchito kumalo otentha kwambiri. Chophimba chamtunduwu ndi chosavuta kugwiritsa ntchito ndipo chimakhala ndi kawopsedwe kakang’ono, ndipo chimakhala ndi zotsutsana ndi kuvala komanso zoteteza chinyezi. Zovala za silicone ndi gawo limodzi lazinthu.

Paraxylene:

Kupaka kwa paraxylene kumayikidwa pa PCB pogwiritsa ntchito njira yoyika nthunzi wamankhwala. Paraxylene imakhala mpweya ikatenthedwa, ndipo ikatha kuzirala, imayikidwa m’chipinda momwe imapangidwira ndikukhala filimu yopyapyala. Kenako filimuyo yokutidwa pamwamba pa PCB.

Chitsogozo chosankha zokutira zoteteza za PCB

Mtundu wa zokutira zovomerezeka zimadalira makulidwe a zokutira zofunika, malo oti aphimbidwe, ndi kuchuluka kwa zomatira ku bolodi ndi zigawo zake.

Momwe mungagwiritsire ntchito zokutira zovomerezeka ku PCB?

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