roj hmab ua txheej txheem
1. Cov txheej txheem yooj yim
Muaj ntau ntau yam khoom siv roj hmab, tab sis cov txheej txheem tsim khoom yog tib yam. Cov txheej txheem tseem ceeb ntawm cov khoom siv roj hmab siv cov roj hmab raw li raw khoom suav nrog rau 6 txheej txheem ntawm plasticization, sib tov, calendering, extrusion, molding thiab vulcanization. Tau kawg, cov txheej txheem yooj yim xws li kev npaj cov khoom siv raw, ua tiav, tshuaj xyuas thiab ntim cov khoom tiav kuj tseem ceeb.
Kev ua cov roj hmab yog tsuas yog los daws qhov tsis sib xws ntawm plasticity thiab elasticity. Los ntawm ntau yam kev siv tshuab, cov roj hmab elastic tau hloov mus rau hauv cov khoom siv yas nrog cov yas, thiab tom qab ntawd ntau cov khoom sib xyaw ua ke tau ntxiv los ua cov khoom tiav, thiab tom qab ntawd cov khoom lag luam semi-tiav tau ua rau cov khoom siv roj hmab zoo heev. . Lub cev thiab mechanical zog los ntawm vulcanization.
2. Raw khoom npaj
1. Lub ntsiab raw khoom ntawm cov khoom siv roj hmab yog cov roj hmab nyoos, uas loj hlob ntawm cov ntoo roj hmab hauv thaj chaw sov thiab subtropical thiab tau sau los ntawm kev txiav cov tawv ntoo.
2. Ntau yam compounding agents yog cov khoom siv ntxiv los txhim kho qee yam khoom ntawm cov khoom siv roj hmab.
3. Cov ntaub ntawv fiber ntau (paj rwb, hemp, ntaub plaub thiab ntau yam khoom siv fiber ntau, hluavtaws fibers thiab cov ntaub ntawv hlau, steel hlau) yog siv los ua cov khoom siv pob txha ntawm cov khoom siv roj hmab los txhim kho cov khoom siv dag zog thiab txo cov deformation ntawm cov khoom.
Thaum npaj cov khoom siv raw, cov khoom xyaw yuav tsum raug ntsuas kom raug raws li daim ntawv qhia. Yuav kom sib tov cov roj hmab nyoos thiab cov roj hmab sib npaug, cov khoom siv raw yuav tsum tau ua tiav. Cov roj hmab nyoos yuav tsum tau qhuav nyob rau hauv qhov cub ntawm 60-70 degree, thiab txiav mus rau hauv me me pieces, thiab cov sib tov muaj lumps. Xws li paraffin, stearic acid, rosin, thiab lwm yam yuav tsum tau crushed. Yog tias tsim nyog tshem tawm cov impurities, xws li impurities hauv kev sib tov thiab ziab, impurities uas yooj yim tshem tawm, xws li ya raws hauv qhov sib tov, cov dej noo hauv qhov sib tov yuav txo, thiab qhov zoo yuav txo. Yog tias tsim nyog los tshem tawm cov impurities xws li cov dej noo hauv qhov sib tov, qhov zoo ntawm cov khoom yuav raug cuam tshuam, cov ntsiab lus noo noo hauv qhov sib tov yuav raug txo,
3. Kev tsim thiab kho kom zoo
Raw roj hmab yog elastic, tsis muaj qhov tsim nyog plasticity thaum lub sij hawm ua, thiab tsis yooj yim rau txheej txheem. Txhawm rau txhim kho nws cov plasticity, nws yog ib qho tsim nyog yuav tsum tau ua kom cov roj hmab nyoos kom cov khoom sib xyaw ua ke yooj yim kom sib cais sib npaug hauv cov roj hmab nyoos thaum sib tov. Nyob rau tib lub sij hawm, nyob rau hauv tus txheej txheem ntawm calendering, nws kuj pab txhim kho lub permeability ntawm roj hmab, nkag mus rau hauv fiber ntau fabrics thiab tsim fluidity. Cov txheej txheem ntawm degrading cov saw ntev ntev ntawm cov roj hmab nyoos los ua plasticity hu ua plasticization.
Muaj ob txoj hauv kev ntawm masticating raw roj hmab: mechanical masticating thiab thermoplastic roj hmab masticating. Kev siv tshuab plasticization yog los ntawm kev siv tshuab extrusion thiab kev sib txhuam ntawm cov yas yas ntawm qhov kub qis kom txo qis cov hlua ntev roj hmab molecules thiab ua kom luv luv, hloov ntawm lub xeev elastic mus rau lub xeev yas. Thermoplastic roj hmab sib xyaw yog kom dhau cov cua kub compressed rau hauv cov roj hmab nyoos. Nyob rau hauv qhov kev txiav txim ntawm tshav kub thiab oxygen, cov saw ntev molecules yog degraded thiab shortened, yog li tau txais plasticity.
Txhawm rau hloov kho cov kev siv sib txawv, tau txais cov khoom sib txawv, txhim kho kev ua haujlwm ntawm cov khoom siv roj hmab, thiab txo cov nqi, cov khoom sib txawv sib txawv yuav tsum tau muab ntxiv rau cov roj hmab nyoos. Kev sib xyaw yog cov txheej txheem ntawm kev sib xyaw cov roj hmab yas yas nrog cov khoom sib xyaw, muab tso rau hauv ib lub tov khoom, thiab dispersing cov khoom siv roj hmab hauv cov roj hmab nyoos tag nrho thiab sib npaug los ntawm kev sib xyaw ua ke. Kev sib tov yog ib qho tseem ceeb hauv kev tsim cov khoom siv roj hmab. Yog tias qhov sib xyaw tsis sib xws, cov nyhuv ntawm cov roj hmab thiab cov khoom sib xyaw tsis tuaj yeem ua tiav, uas yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom. Lub compound tau tom qab sib tov yog hu ua compound. Nws yog ib qho khoom siv ua tiav rau kev tsim khoom ntawm ntau yam khoom siv roj hmab. Feem ntau hu ua roj hmab compound, nws feem ntau yog muag raws li cov khoom lag luam. Cov neeg yuav khoom tuaj yeem siv cov khoom siv roj hmab los ua cov txheej txheem ncaj qha, tsim thiab vulcanize los ua cov khoom siv roj hmab uas yuav tsum tau ua. Raws li kev sib txawv formulations, muaj ib tug series ntawm ntau yam nrog txawv qib thiab txawv zog