Kaya sing wis dingerteni, kemajuan peralatan elektronik lan teknologi sirkuit terus-terusan, puncak seni teknik ing desain, pengembangan lan pabrikan papan sirkuit cetak (PCB) wis disekseni dening wong ing saindenging jagad. Our planet is full of highly intelligent machines, automated robots and scientific marvels, and of course, there are plenty of PCBS in every corner of the planet, no matter what country or city it is. Nanging, PCBS iki beda-beda ing fungsionalitas, kerumitan, biaya pabrik, kualitas lan reliabilitas. Artikel iki fokus ing rong poin pungkasan, kualitas lan kehandalan PCBS.

Ya, calon pelanggan mesthi pengin elektronik kanthi kualitas dhuwur, nanging iki larang banget lan bisa uga kalebu proses manufaktur sing kompleks. Ing proses rumit manufaktur PCB, perakitan lan pengujian, ana proses penting banget sing diarani “lapisan konformal” PCB. Lapisan konformal iki penting banget ing PCBS babagan kualitas lan linuwih.

Apa lapisan sing cocog lan pentinge:

Conforming coating, an ultra-thin protective coating of polymer film, can be used in conjunction with assemblies mounted on assembly surfaces to protect assembly leads, solder joints, exposed wiring, and other metal points on the PCB surface from corrosion, dust, or chemicals due to various operating or environmental conditions.

Lapisan konformal bisa lancip 25 mikron lan “sesuai” karo bentuk lan tata komponen papan sirkuit. Kaya kasebut ing ndhuwur, alesan nglamar lapisan sing salaras ing permukaan (ndhuwur lan ngisor) PCB kanggo nglindhungi PCB saka kahanan lingkungan eksternal sing ala, saengga bakal nambah umur layanan PCB lan peralatan elektronik sing gegandhengan.

Kaya suhu dhuwur sing ditemokake ing industri, pabrik, lan elektronik sing dhuwur, PCBS kanthi lapisan kasebut bisa tahan suhu ekstrem. Kajaba iku, peralatan elektronik sing dipasang ing wilayah / wilayah sing cedhak karo segara utawa segara bisa uga kena pengaruh asor dhuwur, kayata navigasi peralatan angkatan laut bisa uga ngalami korosi / erosi sing bisa nyebabake oksidasi logam. Similarly, in microbiology laboratories and the medical industry, sensitive electronic equipment can be exposed to toxic chemicals, acidic and alkaline solvents that can accidentally spill onto a PCB, but the PCB’s “conformation coating” will protect the PCB and components from fatal injury.

Kepiye cara ngetrapake lapisan konformal?

In fact, the method of applying “conformal paint” in the right way is so important that careful consideration must be given to how conformal paint is applied. It is as important to choose suitable conformal coating materials.

Faktor utama sing nemtokake aplikasi lapisan sing cocog yaiku:

1- Kandel cet

2- The level of coverage achieved

3- The degree of adhesion of paint to wood panels and their components.

There are five methods for applying conformal coatings:

1- Cat nganggo tangan nganggo sikat

2- Lapisan aerosol

3- Atomizing spray gun coating

4- Automatic dip coating

5- Automatic selection of coating

Cara ngobati / pangatusan lapisan sing cocog:

Conformal coatings themselves can be classified according to the drying and curing methods used after conformal coatings are completed. These methods are:

1- Heat/heat curing: Conformal coating is dried at high temperature. Drying rate is much faster than normal room temperature drying/curing.

2- Obat kondensasi: Lapisan PCB sing cocog wis garing ing suhu sekitar, kelembapan ing swasana nyuda proses ngobati utawa pangatusan.

3- ULTRAVIOLET (UV) curing: Here PCB with conformal coating is exposed to UV radiation. The uv energy determines the curing speed of PCB conformal coating

4: Obat oksidasi: Ing metode iki, konformator PCB kena ing lingkungan udara terbuka kanthi oksigen atmosfer sing akeh, sing bakal mbantu pangatusan / ngobati konformator adhedhasar pelarut

5- Catalytic curing: This is the process of curing conformal coating in which two materials are fused together, one of which is conformal coating. Sawise lapisan dilebokake karo bahan katalis liyane, proses ngobati ora bisa mandheg nganti rampung.

Classification of conformal coatings:

There are five main conformal coatings used: acrylic resin, epoxy resin, silicone, polyurethane (PU) and polyparaxylene coating.

Resin akrilik L (AAR):

Acrylics are ideal for (low-cost and high-volume) common electronics because AAR is inexpensive and can be easily applied to PCB surfaces by brush, dip, and manual or automatic spraying, reducing turnaround time and producing cost-effective products.

Wuku:

1 – biaya murah

2- Gampang kanggo aplikasi robot manual utawa otomatis

3- Easy to rework

4 – Perlindhungan kelembapan sing apik banget

5- Good surface elasticity, can withstand static voltage discharge, and does not react with the atmosphere, therefore helps cure through solvent evaporation

cacat:

1- Due to the use of atmospheric curing/drying methods for this material, proper ventilation systems need to be ensured

2- Pangopènan viskositas sing sithik

3 – Ketahanan ageman lan resistensi kimia sing sithik

L Epoxy conformal coating (ER) :

Lapisan konformal adhedhasar resin epoksi bisa dirampungake nganggo sikat tangan, semprotan utawa celup. Nyemprot dianjurake kanggo volume sing luwih gedhe lan volume utawa prototipe PCBS sing luwih cilik.

Wuku:

1- High moisture resistance and good dielectric resistance

2- Excellent chemical resistance, abrasion resistance, moisture resistance and high temperatures up to 150 O C

cacat:

1-epoxy conformal paint is very hard and rigid and can damage PCB and its components if attempted peeling or removal. Copot lapisan kanthi nggunakake pelarut sing mbebayani

2- Kinerja suhu kurang sithik

3- Nyusut banget

4- Dheweke angel diowahi

Resin silikon resin silikon (OSR):

The softest of the above two types of conformal coatings is silicone resin (OSR) conformal coatings. They are widely used in LED lamp PCBS without reducing light intensity or color change. Ideal for PCB installation at high humidity and exposure to air. Suitable for PCB with high operating temperature and high power

Wuku:

1- resistensi kimia sing apik, tahan lembab, semprotan uyah lan suhu dhuwur nganti 200 OC

2- Fleksibilitas sing apik ndadekake tahan stres ing PCB saka lingkungan njaba.

3- Cocog kanggo aplikasi ruangan PCB kanthi asor dhuwur

Sing ala:

1- Ora nganggo tahan amarga sifat karet

2- Bisa diolah maneh, nanging ora gampang, mbutuhake pelarut khusus, wektu rendhem dawa lan aduk kaya sikat utawa bath ultrasonik

3- Low mechanical strength, weak adhesion to PCB substrate

Lapisan konformal Polyurethane (PU):

Cocog kanggo aplikasi PCB ing otomotif, industri, instrumentasi lan telekomunikasi. Ing aerospace, utamane, uap bahan bakar terus tabrakan karo awak utama peralatan elektronik lan mula nembus menyang interior lan mengaruhi papan PCB

Wuku:

1- High resistance to moisture, chemicals (acid and alkali) and wear

cacat:

1- Sawise proses ngobati wektu sing suwe, cenderung dadi kuning ing suhu dhuwur amarga kandungan VOC sing dhuwur

2- Kaya silikon, ora gampang dicopot kabeh

L polyparaxylene conformal coating:

This type of coating is suitable for avionics, microelectronics, sensors, high-frequency circuits, and densely populated PCB-based components. It is applied by means of vapor deposition.

Wuku:

1- Excellent dielectric strength

2- High resistance to moisture, solvents, extreme temperatures and acid corrosion

3- Can be applied evenly with very thin paint.

cacat:

1- Pembongkaran / pengerjaan ulang angel banget

2- Biaya larang minangka kekurangan paling gedhe.