Ma board a lead amafunikira pazinthu zambiri, makamaka PCB multilayer board ndi mitundu yambiri komanso yaing’ono. Ngati njira yowotchera mpweya yotentha ikugwiritsidwa ntchito, mtengo wopangira udzawonjezedwa, kayendetsedwe kake kadzakhala kotalika, ndipo zomangamanga zidzakhala zovuta kwambiri. Pachifukwa ichi, mbale za lead-tin nthawi zambiri zimagwiritsidwa ntchito popanga, koma pamakhala zovuta zambiri pakukonza. Vuto lalikulu kwambiri ndi PCB delamination ndi matuza. Zifukwa zake ndi zotani? Chifukwa:

Zomwe zimayambitsa zovuta zamtundu wa PCB

1. Kuponderezedwa kosayenera kumapangitsa mpweya, chinyezi ndi zowononga kulowa;

2. Panthawi yokakamiza, chifukwa cha kutentha kosakwanira, kuzungulira kwaufupi kwambiri, khalidwe loipa la prepreg, ndi ntchito yolakwika ya atolankhani, zomwe zimabweretsa mavuto ndi digiri ya machiritso;

3. Kusamalidwa bwino kwakuda kwa mzere wamkati kapena pamwamba kumadetsedwa panthawi yakuda;

4. Chovala chamkati kapena prepreg ndi choipitsidwa;

5. Kusakwanira kwa guluu kuyenda;

6. Guluu wochulukirachulukira-pafupifupi zomatira zonse zomwe zili mu prepreg zimatulutsidwa kunja kwa bolodi;

7. Pankhani ya zofunikira zosagwira ntchito, bolodi lamkati lamkati liyenera kuchepetsa maonekedwe a malo akuluakulu amkuwa (chifukwa mphamvu yolumikizana ndi utomoni pamtunda wamkuwa ndi wotsika kwambiri kuposa mphamvu yogwirizanitsa ya utomoni ndi utomoni);

8. Pamene kuponderezedwa kwa vacuum kumagwiritsidwa ntchito, kupanikizika sikukwanira, komwe kungawononge kuyenda kwa guluu ndi kumamatira (kupanikizika kotsalira kwa bolodi la multilayer lopanikizidwa ndi kutsika kochepa kumakhala kochepa).

Kwa mafilimu ocheperako, chifukwa kuchuluka kwa guluu kumakhala kochepa, vuto la utomoni wosakwanira wa m’dera limakhala lotheka, choncho kugwiritsa ntchito mafilimu oonda kuyenera kuchitidwa mosamala. Pakali pano, chiwerengero cha mbale zoonda chikuchulukirachulukira. Pofuna kusunga bata la makulidwe, mapangidwe a mafakitale a m’munsi amasinthidwa kuti agwirizane ndi kuyenda kochepa. Pofuna kukonza zinthu zakuthupi, zodzaza zosiyanasiyana zimawonjezedwa pamapangidwe a utomoni. Pogwiritsa ntchito gawo lapansi, pewani kugwa kwa colloid panthawi ya opaleshoni, zomwe zingayambitse vuto la thovu la mpweya pansi pa mbale chifukwa cha utomoni wochepa kwambiri kapena wosanjikiza zonona.