Shrinkage yog tus yam ntxwv ntawm tag nrho cov ntaub ntawv nyob rau hauv ib theem hloov ntawm molten mus rau cov khoom, thiab Liquid Silicone Rubber (LSR) yog tsis muaj kev zam. Txawm li cas los xij, LSR shrinkage yog qhov tshwj xeeb vim nws cov txheej txheem kho. Tsis zoo li cov thermoplastics, uas feem ntau ntsws thaum lawv txias, LSR shrinks feem ntau thaum lub sij hawm tus ntoo khaub lig- txuas tshuaj tiv thaiv. Qhov no curing shrinkage yog me me thiab zoo ib yam, feem ntau yog li ntawm 0.1% mus rau 0.3%. Qhov kev twv ua ntej no yog qhov txiaj ntsig tseem ceeb hauv kev ua tiav qhov kev zam nruj. Txawm li cas los xij, kev hloov pauv hauv qhov shrinkage tuaj yeem tshwm sim raws li ntau yam, ua rau nws tseem ceeb heev rau cov neeg tsim pwm kom nkag siab thiab them nyiaj rau lawv.
Ib feem geometry profoundly influences pom shrinkage. Thicker seem siv sij hawm ntev los kho tag nrho, thiab qhov sib txawv ntawm qhov sib txawv ntawm daim tawv nqaij thiab cov tub ntxhais tuaj yeem ua rau tsis sib xws, ua rau muaj kev sib tsoo lossis cov cim dab dej. Kev taw qhia ntawm ib feem hauv pwm kuj tseem ceeb; ntws kev taw qhia tuaj yeem tsim anisotropic shrinkage, qhov ntev ntawm qhov sib npaug thiab perpendicular mus rau qhov ntws nthuav qhia me ntsis txawv shrinkage tus nqi. Pwm kub yog lwm qhov hloov pauv tseem ceeb. Cov pwm kub siab dua tuaj yeem ua rau kev kho, uas qee zaum tuaj yeem ua rau me ntsis nce hauv qhov shrinkage vim nrawm dua, ua tiav ntau dua - txuas.
Filler cov ntsiab lus hauv LSR cov ntsiab lus tseem ceeb cuam tshuam rau qhov shrinkage. Cov LSR uas tsis tau ua tiav lossis tsis muaj tseeb feem ntau pom muaj qhov poob qis dua piv rau cov qhab nia hnyav. Fillers zoo li silica ua raws li cov thauj tog rau nkoj hauv cov polymer matrix, txwv kev txav mus los ntawm cov saw hlau polymer thiab yog li txo qis tag nrho cov shrinkage. Hom, qhov loj me, thiab qhov feem pua ntawm qhov muab tub lim yog qhov tseem ceeb. Cov neeg tsim qauv yuav tsum paub txog qhov tshwj xeeb shrinkage yam ntxwv ntawm LSR compound lawv xav siv. Cov ntaub ntawv no feem ntau yog muab los ntawm cov khoom siv thiab yog qhov tseem ceeb rau kev tsim pwm raug.
Kev them nyiaj rau shrinkage hauv pwm tsim yog kev tshawb fawb meej. Cov kab noj hniav pwm yog txhob txwm ua kom loj dua qhov kawg qhov xav tau qhov ntev los ntawm tus nqi sib npaug ntawm qhov xav tau shrinkage. Rau qhov tseem ceeb qhov ntev, qhov nyiaj them no yuav raug kho raws li ib feem ntawm qhov geometry thiab cov dej ntws tshwj xeeb uas tau kwv yees los ntawm kev ntsuas pwm ntws. Los ntawm kev suav nyiaj kom raug rau qhov shrinkage, cov neeg tsim pwm ua kom ntseeg tau tias qhov kawg LSR qhov chaw ua tau raws li qhov yuav tsum tau muaj qhov tshwj xeeb zoo ib yam, txo qis qhov xav tau rau kev tshaj tawm - pwm hloov lossis rov ua haujlwm dua.