Mar a tha fios againn uile, adhartas leantainneach uidheamachd dealanach agus teicneòlas cuairteachaidh, an ìre as àirde de ealain innleadaireachd ann an dealbhadh, leasachadh agus saothrachadh bòrd cuairteachaidh clò-bhuailte Chunnaic daoine air feadh an t-saoghail (PCB). 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. Ach, tha na PCBSan sin eadar-dhealaichte ann an comas gnìomh, iom-fhillteachd, cosgais saothrachaidh, càileachd agus earbsachd. Tha an artaigil seo ag amas air an dà phuing mu dheireadh, càileachd agus earbsachd PCBS.

Tha, tha luchd-ceannach a tha san amharc an-còmhnaidh ag iarraidh electronics àrd-inbhe, ach tha seo gu math daor agus faodaidh pròiseasan saothrachaidh iom-fhillte a bhith ann. Anns a ’phròiseas iom-fhillte de saothrachadh, co-chruinneachadh agus deuchainn PCB, tha pròiseas glè chudromach ann ris an canar“ còmhdach conformal ”de PCB. This conformal coating is very important in PCBS in terms of quality and reliability.

Dè a th ’ann an còmhdach conformal agus cho cudromach:

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.

Faodaidh an còmhdach conformal a bhith cho tana ri 25 micron agus “a’ cumail ri cumadh agus cruth a ’bhùird chuairt. Mar a chaidh a ràdh gu h-àrd, is e an adhbhar airson còmhdach co-fhreagarrach a chur an sàs air uachdar (mullach is bonn) PCB gus am PCB a dhìon bho dhroch shuidheachadh àrainneachd taobh a-muigh, mar sin a ’meudachadh beatha seirbheis a’ PCB agus uidheamachd dealanach co-cheangailte ris.

Coltach ri teodhachd àrd a lorgar ann an gnìomhachas, factaraidh agus electronics àrd-chumhachd, faodaidh na PCBS sin le còmhdach co-fhreagarrach seasamh ri fìor theodhachd. San aon dòigh, faodaidh uidheamachd dealanach a tha air a chuir a-steach ann an ceàrnaidhean / ceàrnaidhean faisg air a ’mhuir no an cuan buaidh a thoirt air taiseachd àrd, leithid a bhith a’ seòladh uidheamachd nèibhidh dealanach a bhith air a thruailleadh / bleith a dh’fhaodadh leantainn gu oxidachadh meatailt. 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.

Ciamar a chuireas tu còmhdach co-fhreagarrach?

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.

Is iad na prìomh nithean a tha a ’dearbhadh cleachdadh ceart còtaichean conformal:

1- Tiugh peant

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- Paint le làimh le bruis

2- Còmhdach aerosol

3- Atomizing spray gun coating

4- Automatic dip coating

5- Automatic selection of coating

Modh ciùraidh / tiormachaidh còmhdach co-chòrdail:

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

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

2- Curachadh tiughachaidh: Tha an còmhdach conformal de PCB air a thiormachadh aig teòthachd àrainneachd, bidh taiseachd san àile a ’slaodadh sìos am pròiseas ciùraigidh no tiormachaidh.

3- ULTRAVIOLET (UV) curing: Here PCB with conformal coating is exposed to UV radiation. Bidh an lùth uv a ’dearbhadh astar ciùraigidh còmhdach conformal PCB

4- A ’ciùradh oxidation: Anns an dòigh seo, tha luchd-rèiteachaidh PCB fosgailte do àrainneachd a-muigh le tòrr ocsaidean àileach, a chuidicheas le bhith a’ tiormachadh / a ’ciùradh co-rèitearan stèidhichte air fuasgladh

5- Catalytic curing: This is the process of curing conformal coating in which two materials are fused together, one of which is conformal coating. Aon uair ‘s gu bheil an còmhdach air a leaghadh le stuthan catalpa eile, chan urrainnear stad a chuir air a’ phròiseas ciùraidh gus am bi e deiseil.

Classification of conformal coatings:

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

L Resin acrylic (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.

buannachdan:

1 – cosgais ìseal

2- Furasta airson tagraidhean robot làimhe no fèin-ghluasadach

3- Easy to rework

4- Dìon taise sàr-mhath

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

Eas-bhuannachdan:

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

2- Cumail suas slaodachd ìosal

3- Seasamh caitheamh ìosal agus strì ceimigeach

L Epoxy conformal coating (ER) :

Faodar còmhdach co-chòrdail stèidhichte air resins epoxy a chrìochnachadh le bruis làimhe, spraeadh no còmhdach dip. Thathas a ’moladh spraeadh airson meudan nas motha agus airson PCBS nas lugha no prototype.

buannachdan:

1- High moisture resistance and good dielectric resistance

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

Eas-bhuannachdan:

1-epoxy conformal paint is very hard and rigid and can damage PCB and its components if attempted peeling or removal. Thoir air falbh an còmhdach le bhith a ’cleachdadh fuasgladh cunnartach

2- Coileanadh droch theodhachd ìosal

3- Lùghdachadh ciùraigidh àrd

4- Tha iad duilich ath-dhèanamh

L còmhdach còmhdaich roisinn silicone (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

buannachdan:

1- Deagh aghaidh cheimigeach, neart taiseachd, dòrtadh salainn agus teothachd àrd suas gu 200 OC

2- Good flexibility makes it resistant to vibration stress on PCB from external environment.

3- Freagarrach airson tagraidhean a-muigh PCB le àrd taiseachd

An droch:

1- Gun a bhith a ’caitheamh resistant air sgàth feartan rubair

2- Faodar ath-obrachadh, ach chan eil e furasta, a ’feumachdainn fuasglaidhean sònraichte, amannan bog fada agus a’ gluasad mar bhruis no amar ultrasonic

3- Neart meacanaigeach ìosal, gèilleadh lag ri substrate PCB

Còmhdach conformal L Polyurethane (PU):

Freagarrach airson tagraidhean PCB ann an càraichean, gnìomhachas, ionnsramaid agus cian-chonaltradh. Ann an aerospace, gu sònraichte, bidh bhalbhaichean connaidh an-còmhnaidh a ’bualadh leis a’ phrìomh bhuidheann de uidheamachd dealanach agus mar sin a ’dol a-steach don taobh a-staigh agus a’ toirt buaidh air bòrd PCB

buannachdan:

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

Eas-bhuannachdan:

1- Às deidh ùine mhòr de phròiseas ciùraidh iomlan, tha e buailteach a bhith a ’tionndadh buidhe aig teòthachd àrd mar thoradh air an t-susbaint àrd VOC aige

2- Coltach ri silicon, chan eil e furasta a thoirt air falbh gu tur

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.

buannachdan:

1- Excellent dielectric strength

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

3- Can be applied evenly with very thin paint.

Eas-bhuannachdan:

1- Tha disassembly / rework gu math duilich

2- Is e cosgais àrd an tarraing as motha.