Overmoldingsilicone rau hauv cov yas substrates yog cov txheej txheem muaj zog rau kev tsim ntau yam - cov khoom siv nrog kev ua haujlwm zoo dua qub. Cov txheej txheem no ua ke nrog kev nruj thiab kev ncaj ncees ntawm cov yas nrog qhov yooj yim, mos- kov xav, thiab ib puag ncig sealing zog ntawm silicone. Kev ua tiav kev sib raug zoo ntawm cov ntaub ntawv sib txawv no yog thawj qhov kev sib tw. Cov tshuaj sib raug zoo ntawm cov yas substrate nrog silicone yog qhov tseem ceeb. Qee cov yas, zoo li polypropylene los yog polyethylene, muaj lub zog nto qis thiab xav tau cov primers tshwj xeeb lossis kev kho saum npoo los txhawb kev adhesion. Lwm tus, zoo li ABS los yog polycarbonate, sib koom ua ke nrog cov qauv silicone qauv.
Cov txheej txheem molding yog qhov tseem ceeb. Feem ntau, cov yas substrate ('core') yog txhaj molded ua ntej. Tom qab ntawd nws yuav tsum tau muab tso rau hauv qhov pwm thib ob ib nrab rau kev txhaj tshuaj silicone overmolding. Qhov kev hloov pauv no tuaj yeem ua tau phau ntawv, tab sis rau siab - ntim ntau lawm, automated pick- thiab - qhov chaw los yog cov rooj teb yog siv rau qhov raug thiab ceev. Qhov tsim ntawm qhov sib txuas ntawm ob cov ntaub ntawv tseem ceeb heev. Mechanical interlocks, xws li undercut grooves los yog kev ntxhib los mos ntawm cov yas nto, txhim kho lub cev anchoring ntawm silicone. Cov tshuaj tiv thaiv kev sib koom ua ke tuaj yeem txhim kho adhesion ntawm qib molecular.
Cov txheej txheem tsis sib xws rau kev txhaj tshuaj silicone overmolding txawv ntawm tus qauv -cov ntaub ntawv molding. Cov pwm kub rau cov tub ntxhais yas yuav tsum tau xav txog. Yog tias nws kub dhau, nws tuaj yeem degrade cov silicone lossis ua rau flashing. Yog tias nws txias dhau, nws tuaj yeem ua rau tsis zoo ntub dej thiab tsis tiav encapsulation. Kev txhaj tshuaj nrawm thiab siab rau cov silicone yuav tsum tau ua tib zoo tswj kom tsis txhob txav los yog deforming cov tub ntxhais yas me me. Tsawg-siab, qeeb- nrawm nrawm yog feem ntau tsim nyog. Tuav lub siab thiab kho lub sij hawm raug kho kom ua tiav cov ntoo khaub lig- txuas ntawm silicone yam tsis muaj cua sov ntawm cov yas substrate.
Kev tswj xyuas zoo rau cov khoom overmolded yog nruj. Kev tshuaj xyuas qhov muag pom kev ua rau flash, txhaj tshuaj luv luv, lossis pom kev delamination. Kev ntsuam xyuas adhesion, xws li tev los yog kev ntsuas tensile, yog ua los xyuas kom meej tias cov ntawv cog lus muaj zog raws li cov lus qhia tshwj xeeb. Kev ntsuam xyuas ib puag ncig, zoo li thermal cycling los yog immersion nyob rau hauv cov tshuaj, xyuas kom meej tias daim ntawv cog lus tseem zoo nyob rau hauv cov kev pab cuam. Los ntawm kev paub txog cov tswv yim no, cov tuam txhab tsim khoom tuaj yeem tsim cov khoom sib txawv, siab - cov khoom muaj nqis rau kev lag luam xws li tsheb (mos- kov grips) mus rau cov cuab yeej kho mob (cov ntsaws ruaj ruaj thiab gaskets) nrog kev sib xyaw ua ke nyuaj / mos.