Dab tsi yog qhov kev txwv ntawm elongation feem pua ntawm cov khoom siv roj hmab?
Qhov feem pua ntawm stretch rate muaj qee qhov kev txwv ntawm kev siv cov khoom siv roj hmab. Nov yog qee qhov kev txwv ntau:
- Cov kev txwv muaj zog: Cov khoom siv roj hmab siab siab feem ntau txi qee lub zog. Txawm hais tias nws muaj qhov zoo ductility thiab elasticity, nws lub zog tensile tuaj yeem qis dua. Qhov no txhais tau hais tias cov khoom siv roj hmab siab yuav tsis haum rau hauv daim ntawv thov uas yuav tsum tau tiv taus siab nruj los yog shear quab yuam.
- Durability txwv: Cov khoom siv roj hmab siab tuaj yeem nkag los lossis poob elasticity nyob rau hauv kev ntxhov siab ntev. Nyob rau hauv qee qhov kev thauj mus los ntev lossis qhov kub thiab txias, cov khoom siv roj hmab tuaj yeem deform, hnub nyoog, lossis poob lawv cov khoom qub. Yog li ntawd, cov nyhuv ntawm stretch npaum li cas nyob rau hauv lub durability ntawm cov ntaub ntawv roj hmab yuav tsum tau txiav txim siab nyob rau hauv cov kev siv uas yuav tsum tau mus ntev-ntev kev ua tau zoo.
- Kev txwv kev ua haujlwm ntawm kev sib khi: Txawm hais tias cov khoom siv roj hmab uas muaj kev sib tw siab tuaj yeem muab kev sib khi zoo, qee zaum, kev ncab ntau dhau tuaj yeem ua rau ntau dhau deformation thiab looseness ntawm sealing nto. Qhov no tuaj yeem ua rau cov dej xau lossis txo qhov kev sib khi ua haujlwm. Yog li ntawd, nyob rau hauv ib co tshwj xeeb sealing daim ntaub ntawv, nws yog tsim nyog los xaiv ib tug tsim nyog stretch npaum li cas raws li cov kev cai tshwj xeeb.
- Chemical Resistance Limitations: High stretch rubber cov ntaub ntawv yuav ua rau muaj kev cuam tshuam ntau dua rau qee yam tshuaj. Qee cov tshuaj yuav ua rau cov khoom siv roj hmab o, muag muag, deterioration lossis poob lawv cov khoom qub. Yog li ntawd, cov nyhuv ntawm stretch npaum li cas ntawm cov tshuaj tiv thaiv ntawm cov ntaub ntawv roj hmab yuav tsum tau txiav txim siab nyob rau hauv daim ntawv thov uas yuav tsum tau kev sib cuag nrog tej yam tshuaj.
Tom ntej no, cia peb saib cov khoom siv roj hmab uas muaj qhov ncab ntawm 15%:
- Cov roj hmab ntuj (NR): Cov roj hmab ntuj yog muab rho tawm los ntawm cov latex ntawm cov ntoo roj hmab thiab muaj cov elasticity zoo thiab tensile zog.
- Nitrile Butadiene Roj Hmab (NBR): Nitrile Butadiene Roj Hmab yog cov roj hmab hluavtaws uas muaj cov roj zoo heev thiab kev puas tsuaj thiab feem ntau siv rau hauv thaj chaw xws li hydraulic seals thiab cov khoom siv tsheb.
- Styrene-butadiene roj hmab (BR): Styrene-butadiene roj hmab yog cov roj hmab hluavtaws uas muaj kev hnav zoo thiab ua haujlwm txias. Nws yog feem ntau siv rau hauv cov log tsheb, cov roj hmab thiab lwm yam khoom.
- Ethylene-propylene roj hmab (EPDM): Ethylene-propylene roj hmab yog cov roj hmab hluavtaws uas muaj huab cua zoo heev thiab tshuaj tiv thaiv corrosion. Nws yog feem ntau siv hauv cov ntsaws ruaj ruaj, xaim thiab cable rwb thaiv tsev thiab lwm yam.
- Chloroprene (CR): Chloroprene yog cov roj hmab hluavtaws nrog kev hnav zoo thiab kev laus ua haujlwm. Nws yog feem ntau siv hauv cov kav dej roj hmab, cov khoom siv dej tsis zoo thiab lwm yam kev lag luam.
Cov ntawv thov sib txawv muaj qhov kev ua tau zoo sib txawv rau cov khoom siv roj hmab, thiab lwm yam yuav tsum tau txiav txim siab zoo, xws li hardness, kub tsis kam, kev laus tsis kam, tshuaj stability, thiab lwm yam. Yog li ntawd, thaum xaiv cov khoom siv roj hmab, qhov tsim nyog tshaj stretch npaum li cas yuav tsum tau. txiav txim siab raws li qhov yuav tsum tau muaj ntawm daim ntawv thov tshwj xeeb.