Cov yam ntxwv ntawm cov roj hmab

1. Thaum cov khoom siv roj hmab raug tsim, lawv raug compressed nyob rau hauv siab. Vim muaj qhov sib xyaw ua ke ntawm cov elastomer, lawv tsis tuaj yeem raug tshem tawm. Thaum lub sij hawm molding thiab demolding txheej txheem, shrinkage tsis ruaj tsis khov (lub shrinkage tus nqi ntawm cov roj hmab txawv nyob ntawm seb hom roj hmab) feem ntau tshwm sim, thiab nws yuav tsum siv sij hawm ib lub sij hawm ua ntej nws yuav stabilized. Yog li, thaum pib ntawm kev tsim cov khoom siv roj hmab, tsis hais tus qauv los yog pwm, yuav tsum tau ua tib zoo xam thiab sib koom ua ke. Yog tias tsis yog, nws yooj yim ua rau cov khoom loj tsis ruaj khov, ua rau cov khoom tsis zoo.
2. Roj hmab yog kub yaj thermosetting elastomer, thaum yas yog kub yaj txias txheej. Vim muaj ntau hom thiab hom sulfides hauv cov roj hmab, kuj tseem muaj qhov sib txawv ntawm qhov kub thiab txias ntawm nws cov molding thiab kho, thiab nws tuaj yeem cuam tshuam los ntawm kev hloov pauv huab cua thiab sab hauv tsev kub thiab av noo. Yog li ntawd, kev tsim cov khoom siv roj hmab yuav tsum tau hloov kho kom tsim nyog txhua lub sijhawm. Yog tsis yog, tej zaum yuav muaj qhov sib txawv ntawm cov khoom zoo.
3. Cov khoom siv roj hmab yog cov khoom sib xyaw ntawm cov khoom siv roj hmab ua los ntawm kev sib xyaw ua ke hauv ib qho khoom siv sab hauv. Thaum lub sij hawm sib tov, ib qho qauv tsim los ntawm cov yam ntxwv ntawm cov khoom siv roj hmab uas xav tau, thiab qhov yuav tsum tau ua ntawm cov khoom hardness yog txiav txim siab. Cov khoom yog tsim thiab molded siv lub tshuab roj hmab ca vulcanization. Tom qab cov khoom tsim, qhov kawg trimming kev kho mob yog nqa tawm los xyuas kom meej tias cov nto ntawm cov khoom yog du thiab tsis muaj burrs.
4. Kev ntsuam xyuas kev laus ntawm cov khoom siv roj hmab yog nyob rau hauv qeb ntawm kev kuaj kev laus. Rubber aging yog hais txog qhov tshwm sim uas cov roj hmab thiab nws cov khoom raug hloov pauv hauv kev ua haujlwm thiab cov qauv vim muaj kev sib xyaw ua ke ntawm cov khoom siv sab hauv thiab sab nraud thaum ua, khaws cia, thiab siv, ua rau poob ntawm cov txiaj ntsig zoo. Manifested li cracking, sticking, hardening, softening, hmoov, discoloration, pwm loj hlob, thiab lwm yam.