This paper clearly points out the problems related to humidity in luam tawm hauv Circuit Court board. Nov yog kab lus raug hais txog kev txo qhov cuam tshuam ntawm ya raws ntawm txhua yam ntawm cov ntawv luam tawm Circuit board. From material fusion, PCB layout, prototyping, PCB engineering, assembly through packaging and order delivery stages, attention should be paid to the influence of moisture in PCB manufacturing to avoid damage and other problems with PCB functionality. In addition, give us an insight into the important measures to control humidity levels during lamination, controls implemented during PCB assembly and control storage, packaging and transportation.

Rigid/flexible PRINTED circuit board assemblies, cable bundles, boxed assemblies or Wire bundles PCB assemblies yog tsim los ntawm ntau hom khoom siv uas ua tau raws li cov khoom xav tau rau lub zog muaj zog thiab ua tau zoo hauv hluav taws xob siv hauv txhua qhov kev lag luam loj thoob ntiaj teb. Nws yuav tsum tau muaj qhov ntau zaus, tsis muaj kev cuam tshuam, kev ua kom nruj, ua kom muaj zog, lub zog hnyav, qhov hnyav, ntau yam, tswj qhov kub lossis tiv thaiv av noo, thiab PCB tuaj yeem ua ib leeg, ob npaug lossis ntau txheej, nyob ntawm qhov nyuaj ntawm Circuit Court. Ntawm txhua qhov teeb meem loj uas yuav tsum tau saib rau hauv thawj theem ntawm PCB kev tsim khoom, av noo lossis av noo yog qhov tseem ceeb uas ua rau tsim chav rau hluav taws xob thiab tshuab tsis ua haujlwm hauv PCB ua haujlwm.

Dab tsi yog qhov cuam tshuam ntawm ya raws ntawm PCB

Yuav ua li cas cov dej noo tuaj yeem ua teeb meem loj ntawm cov ntawv luam tawm Circuit Circuit?

Los ntawm tam sim no nyob rau hauv epoxy iav prepregs, nthuav tawm hauv PCBS thaum khaws cia, thiab thaum nqus tau, noo noo tuaj yeem tsim ntau yam tsis xws luag hauv PCB sib dhos. Lub sijhawm txheej txheem ntub hauv PCB kev tsim khoom muaj nyob hauv microcracks lossis tuaj yeem tsim lub tsev nyob hauv cov khoom siv sib txuas. Due to the high temperature and steam pressure parallel to the quadcopter configuration in PCB assembly, water absorption is caused.

Raws li cov nplaum thiab kev sib koom ua tsis tiav hauv cov ntawv luam tawm hauv Circuit board ua rau tawg lossis tawg, ya raws tuaj yeem ua rau cov hlau txav mus los tau, ua rau txoj hauv kev tsis muaj kev cuam tshuam rau kev hloov pauv ruaj ntseg. Nrog kev txo qis ntawm iav hloov pauv qhov kub, qhov nce ntawm dielectric qhov tsis tu ncua thiab lwm yam kev puas tsuaj, nws yuav ua rau kev hloov pauv hloov pauv nrawm thiab txo lub sijhawm nthuav tawm siab.

Cov txiaj ntsig tseem ceeb ntawm cov dej noo hauv PCBS yog tias nws txo qis kev ua kom zoo ntawm cov hlau, lamination, cov yeeb yaj kiab tsis kam thiab PCB txheej txheem tsim khoom. Vim yog qhov cuam tshuam ntawm cov dej noo, qhov txwv ntawm kev kub ntxhov siab ntau dhau vim tias iav hloov pauv qhov kub thiab txias. Qee lub sij hawm nws kuj tseem tuaj yeem ua rau luv luv Circuit Court uas tso cai rau dej nkag mus, ua rau cov xeb xeb. Other common properties of hygroscopic properties in PRINTED circuit board assemblies include flame retardation or lamination, increased dissipation factor (DF) and dielectric constant (DK), thermal stress on plated through holes, and oxidation of copper.

Txoj hauv kev los txo cov dej noo hauv PCB kev tsim khoom:

Txawm hais tias PCB kev tsim khoom siv cov txheej txheem yooj yim lossis nyuaj, muaj ntau txoj haujlwm hauv PCB engineering uas xav tau cov txheej txheem ntub thiab tshem tawm cov dej noo seem. Raw materials used in PCB manufacturing need to be protected during storage, handling and stress handling during PCB assembly. Cov hauv qab no yog cov lus qhia luv luv rau kev tswj hwm txhua theem ntawm PCB kev ua haujlwm:

1. laminated

Lamination yog cov theem ua kom lub cev qhuav dej hauv PCB kev tsim khoom vim tias cov tub ntxhais thiab prepreg billet tau sib sau ua ke kom sib txuas cov txheej rau laminate. The main factors controlled in the lamination process are temperature, elapsed time and heating rate. Qee lub sij hawm thaum qhuav qis, kev ntsuas tau ua los txo lub tshuab nqus tsev kom txo tau qhov muaj peev xwm sab hauv tuaj yeem nyiam nqus dej. Yog li ntawd, kev siv hnab looj tes thaum tuav cov ntaub ntawv ua ntej muab kev tswj kom zoo ntawm cov dej noo. Qhov no txo ​​cov kab mob sib kis. Daim npav ntsuas qhov av tsis xeb yuav tsum muaj qhov hloov pauv los daws cov av noo raws li xav tau. Laminates yuav tsum tau muab ntxuav kom luv thiab ua kom muaj txiaj ntsig zoo hauv ib puag ncig kev tswj hwm, uas pab tiv thaiv lub hnab ntim cov dej noo los ntawm kev tsim hauv cov laminates.

2. Cov txheej txheem tom qab lamination thiab PCB sib dhos

Tom qab kev khawb, duab thaij duab, thiab ua haujlwm ua haujlwm hauv PCB kev tsim khoom, qhov nqus dej nqus tau nyob hauv cov txheej txheem ntub dej ntau dua. Vijtsam luam ntawv kho thiab vuam daim npog qhov ncauj ci tau ua tiav cov kauj ruam txhawm rau txhawm rau nkag mus rau qhov dej noo. Qhov no muaj txiaj ntsig zoo dua hauv kev txo qis qib nqus dej los ntawm kev txo qis lub sijhawm sib nrug ntawm cov kauj ruam thiab txawm tias mob siab rau tswj cov xwm txheej cia. Los ntawm kev ua kom ntseeg tau tias PCB tau qhuav txaus nyob rau theem pib ntawm lamination, pawg thawj coj tuaj yeem pab txo qis tom qab lamination ua haujlwm. Ib qho ntxiv, ua kom tiav zoo siv los tiv thaiv kev tawg thaum lub sijhawm drilling thiab tshem tawm cov dej noo los ntawm qhov seem los ntawm kev ci ua ntej cov cua kub txheej txheem txheej txheem txheej txheem. Lub sijhawm ci yuav tsum tau tswj hwm los ntawm kev txiav txim siab txog qib ntawm cov dej noo, qhov nyuaj ntawm kev tsim khoom PCB, kev kho PCB saum npoo thiab tuab txaus xav tau rau pawg thawj coj saib.

Yog li ntawd, nws yog ib qho tseem ceeb kom paub qhov xwm txheej tshiab kawg ntawm cov dej noo hauv PCB kev tsim khoom kom tsis txhob ua tsis tiav, puas thiab luv Circuit Court ntawm PCB, thaum nce tus nqi rov ua haujlwm. Tam sim no, cov kws tshawb fawb tab tom yuav los qhia txog kev daws teeb meem ntau dua uas txuag lub sijhawm, lub zog thiab tus nqi los ntawm kev siv ib puag ncig tus phooj ywg PCB thev naus laus zis los tswj cov dej hauv txhua qib ntawm PCB kev tsim khoom.