E pei ona tatou iloa uma, o le alualu i luma alualu i luma o mea faaeletonika masini ma matagaluega tekonolosi, o le tumutumu o inisinia faatufugaga i le mamanu, atinae ma le gaosiaina o lolomi laupapa matagaluega (PCB) na molimauina e tagata i le lalolagi atoa. 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. Peitai, o nei PCBS e eseʻese i galuega, faigata, tau o gaosiga, lelei ma le faʻatuatuaina. O lenei tusitusiga o loʻo faʻatauaina i vaega mulimuli e lua, le lelei ma le faʻatuatuaina o le PCBS.

Ioe, ono manaʻo tagata faʻatau i taimi uma manaʻomia eletise maualuga, ae o lenei e matua taugata ma mafai ona aofia ai laʻasaga faigata gaosiga. I le faigata laʻasaga o PCB gaosiga, faʻatasiga ma faʻataʻitaʻiga, o loʻo i ai se taua tele gaioiga faʻaigoaina o le “conformal coating” o le PCB. Lenei ufiufi ufiufi e taua tele i PCBS i tulaga o le lelei ma le faʻatuatuaina.

O le a le ufiufi o le ufiufi ma lona taua:

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.

O le ufiufi o le ufiufi mafai ona manifinifi pei o 25 microns ma “ogatasi” i le foliga ma vaega faʻatulagaina o le matagaluega laupapa. E pei ona taʻua i luga, o le mafuaʻaga mo le faʻaogaina o se ufiufi talafeagai i luga (luga ma lalo) o le PCB o le puipuia lea o le PCB mai tulaga leaga i fafo atu o le siosiomaga, ma faʻateleina ai le ola olaga o le PCB ma fesoʻotaʻiga masini eletise.

Pei o le maualuga o le vevela o loʻo maua i fale gaosi oloa, fale gaosi oloa, ma le maualuga eletise, o nei PCBS faʻatasi ai ma le ufiufi e mafai ona tatalia le vevela tele. E faʻapena foi, masini eletise e faʻapipiʻi i vaega / nofoaga latalata i le sami poʻo le sami e ono afaina i le maualuga o le susū, e pei o le faʻafoeina o mea tau vaʻalele eletise e mafai ona afaina i le palapala / eleele tafia lea e mafai ona oʻo atu ai i le faʻamamaina o le uʻamea. 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.

Faʻafefea ona faʻaoga paleni faʻatasi?

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.

O mea taua e faʻatulagaina ai le faʻaogaina lelei o paleni faʻafetaui o:

1- Mafiafia o vali

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- Vali ile lima ile pulumu

2- Aerosol ufiufi

3- Atomizing spray gun coating

4- Automatic dip coating

5- Automatic selection of coating

Fofo ufiufi fofo / faʻamago auala:

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- Faʻamalologa faʻapitoa: O le ufiufi talafeagai o le PCB e faʻamamago i le vevela o le vevela, o le susū i le ea e faʻatelegese ai le faʻamalologa poʻo le faʻamagoina.

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- Faʻamaloloina o le okesene: I lenei metotia, e faʻaalia e le au faʻatonutonu PCB se siʻosiʻomaga o le ea matala ma le tele o le okesene o le ea, lea e fesoasoani i le faʻamagoina / faʻamaloloina o faʻatulagaina aitalafu.

5- Catalytic curing: This is the process of curing conformal coating in which two materials are fused together, one of which is conformal coating. O le taimi lava e faʻatasi ai le ufiufi ma isi mea taua, o le faʻamalologa e le mafai ona taofia seʻia maeʻa.

Classification of conformal coatings:

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

L Acrylic resin (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.

faamanuiaga:

1 – tau maualalo

2- Faigofie mo tusi lesona pe otometi ropeti talosaga

3- Easy to rework

4- Lelei tele le susū puipuiga

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

tulaga le lelei:

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

2- Laʻititi le faʻamalositino tausia

3- Laʻititi laʻasaga teteʻe ma teteʻe teteʻe

L Epoxy conformal coating (ER) :

O ufiufi faʻavae e faʻavae i luga o epoxy resins e mafai ona faʻamaeʻaina e le pulumu lima, fana poʻo le fufuina ufiufi. E fautuaina le faʻasusuina mo lapoʻa tetele ma mo laiti laʻititi poʻo prototype PCBS.

faamanuiaga:

1- High moisture resistance and good dielectric resistance

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

tulaga le lelei:

1-epoxy conformal paint is very hard and rigid and can damage PCB and its components if attempted peeling or removal. Aveʻese le ufiufi e ala i le faʻaaogaina o se peleni faʻafefe

2- Le lelei le faʻamalieina o le vevela o galuega

3- Maualuga faʻamalolo shrinkage

4- E faigata ona toe fai

L Silicone resin (OSR) ufiufi tutusa:

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

faamanuiaga:

1- Lelei le teteʻeina o vailaʻau, teteʻe ile susu, faʻasamasima ma le vevela maualuga e oʻo ile 200 OC

2- Lelei fetuʻutuʻunaʻi mafai ai ona teteʻe atu i le gatete popole luga PCB mai fafo siosiomaga.

3- Fetaui lelei mo PCB fafo talosaga ma maualuga sūsū

Le leaga:

1- Aua le ofuina tetee ona o le paʻu meatotino

2- Mafai ona toefausiaina, ae le faigofie, manaʻomia solvene faʻapitoa, umi taimi faʻasusu ma faʻaosofia pei o se pulumu poʻo le ultrasonic tapu

3- Low mechanical strength, weak adhesion to PCB substrate

L Polyurethane (PU) ufiufi tutusa:

Fetaui lelei mo PCB talosaga i taʻavale, pisinisi, mea faigaluega ma fesoʻotaʻiga. I malae vaʻalele, aemaise lava, faʻaputuputu ausa afi faʻafuaseʻi ma le autu tino o mea faʻaeletise ma faʻapea ona ofi totonu o totonu ma aʻafia ai le laupapa PCB

faamanuiaga:

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

tulaga le lelei:

1- A maeʻa se taimi umi o faʻamalolo atoa togafitiga, e foliga mai e liu samasama i le maualuga o le vevela ona o lona maualuga VOC mataupu

2- Pei o le silicon, e le faigofie ona aveʻese atoa

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.

faamanuiaga:

1- Excellent dielectric strength

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

3- Can be applied evenly with very thin paint.

tulaga le lelei:

1- Faʻamavae / toefausia e matua faigata lava

2- Tau maualuga o le sili sili drawback.