1. Cov txheej txheem yooj yim ntws
Muaj ntau ntau yam khoom siv roj hmab, tab sis cov txheej txheem tsim khoom yog tib yam.Cov txheej txheem yooj yim ntawm cov khoom siv roj hmab nrog cov khoom siv roj hmab-raws li cov khoom siv raw khoom suav nrog rau cov txheej txheem yooj yim: plasticizing, sib tov, calendering, extrusion, molding thiab vulcanization.Tau kawg, cov txheej txheem yooj yim xws li kev npaj cov khoom siv raw, cov khoom tiav tiav, kev tshuaj xyuas thiab ntim khoom kuj tseem ceeb.Kev siv thev naus laus zis ntawm roj hmab yog tsuas yog los daws qhov tsis sib xws ntawm plasticity thiab elasticity.Los ntawm ntau txoj kev siv tshuab, cov roj hmab elastic tau hloov mus rau hauv cov yas masticated roj hmab, 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 hloov mus rau hauv cov khoom siv roj hmab uas muaj elasticity thiab zoo lub cev thiab txhua yam. cov khoom los ntawm vulcanization.
2. Raw khoom npaj
Cov khoom siv tseem ceeb ntawm cov khoom siv roj hmab yog cov roj hmab nyoos raws li cov khoom siv yooj yim, thiab cov roj hmab nyoos yog sau los ntawm kev txiav cov tawv ntoo ntawm cov ntoo roj hmab uas cog rau hauv cov tropics thiab subtropics.
Ntau yam compounding agents yog cov khoom siv ntxiv los txhim kho qee yam khoom ntawm cov khoom siv roj hmab.
Cov ntaub ntawv fiber ntau (paj rwb, hemp, ntaub plaub thiab ntau yam tib neeg tsim fibers, hluavtaws fibers thiab hlau cov ntaub ntawv, steel hlau) yog siv los ua pob txha cov ntaub ntawv rau cov khoom siv roj hmab los txhim kho txhua yam muaj zog thiab txwv cov khoom deformation.Nyob rau hauv tus txheej txheem ntawm raw khoom npaj, cov khoom xyaw yuav tsum raug hnyav raws li tus qauv.Txhawm rau kom cov roj hmab nyoos thiab tus neeg sawv cev sib xyaw ua ke sib xyaw ua ke, cov khoom siv yuav tsum tau ua tiav.Cov roj hmab nyoos yuav tsum tau softened nyob rau hauv ib chav qhuav ntawm 60-70 ℃, thiab ces txiav thiab tawg mus rau hauv me me pieces.Lub compounding tus neeg sawv cev yog lumpy.Xws li paraffin, stearic acid, rosin, thiab lwm yam yuav tsum tau crushed.Yog tias cov hmoov muaj cov khoom tsis huv lossis cov khoom ntxhib, nws yuav tsum tau tshuaj xyuas kom tshem tawm cov kua xws li ntoo thuv tar thiab coumarone, uas yuav tsum tau ua kom sov, yaj, evaporated, thiab lim.Kev tsim npuas thaum lub sij hawm tsis sib xws vulcanization cuam tshuam cov khoom zoo.
3. Plasticizing
Raw roj hmab yog elastic thiab tsis muaj cov yas tsim nyog rau kev ua, yog li nws tsis yooj yim rau kev ua.Txhawm rau txhim kho nws cov plasticity, nws yog ib qho tsim nyog yuav tsum tau masticate cov roj hmab nyoos, kom cov neeg sawv cev sib xyaw tuaj yeem yooj yim thiab sib cais hauv cov roj hmab nyoos thaum sib xyaw, thiab tib lub sijhawm, nws tseem yuav pab txhim kho cov permeability ntawm cov khoom siv. roj hmab thiab nkag mus rau hauv cov ntaub fiber ntau thaum lub sij hawm calendering thiab tsim cov txheej txheem.thiab molding fluidity.Cov txheej txheem ntawm degrading cov saw ntev ntev ntawm cov roj hmab nyoos los ua cov yas yog hu ua mastication.Muaj ob txoj hauv kev ntawm plasticizing raw roj hmab: mechanical plasticizing thiab thermal plasticizing.Mechanical mastication yog txheej txheem uas cov hlua ntev roj hmab molecules tau degraded thiab luv luv los ntawm lub siab elasticity mus rau lub xeev yas los ntawm cov neeg kho tshuab extrusion thiab kev sib txhuam ntawm plasticizer ntawm qhov kub thiab txias.Kub plasticizing yog kom dhau cov cua kub compressed rau hauv cov roj hmab nyoos raws li kev ua ntawm cov cua sov thiab cov pa oxygen kom degrade cov saw ntev molecules thiab luv lawv kom tau plasticity.
4. Sib tov
Txhawm rau hloov mus rau ntau yam kev siv, tau txais ntau yam khoom, thiab txhawm rau txhim kho kev ua haujlwm ntawm cov khoom siv roj hmab thiab txo cov nqi, cov khoom sib txawv sib txawv yuav tsum tau ntxiv rau cov roj hmab nyoos.Kev sib xyaw yog txheej txheem uas cov roj hmab masticated yog tov nrog tus neeg sawv cev sib xyaw, thiab tus neeg sawv cev sib xyaw ua ke tag nrho thiab sib xyaw ua ke hauv cov roj hmab nyoos los ntawm kev sib xyaw hauv cov roj hmab sib xyaw.Kev sib xyaw yog ib qho tseem ceeb hauv kev tsim cov khoom siv roj hmab.Yog tias qhov sib tov tsis sib xws, cov nyhuv ntawm cov roj hmab thiab cov tshuaj sib xyaw ua ke tsis tuaj yeem ua tiav, uas cuam tshuam rau kev ua haujlwm ntawm cov khoom.Cov khoom siv roj hmab tau txais tom qab sib tov yog hu ua cov roj hmab sib xyaw.Nws yog cov khoom siv ua tiav rau kev tsim khoom ntawm ntau yam khoom siv roj hmab, feem ntau hu ua cov khoom siv roj hmab, uas 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 nws mus rau hauv cov khoom siv roj hmab uas yuav tsum tau ua..Raws li qhov sib txawv formulations, muaj ntau cov qib sib txawv thiab ntau yam nrog cov khoom sib txawv los xaiv.
5. Kev tsim
Nyob rau hauv cov txheej txheem ntawm cov khoom siv roj hmab, cov txheej txheem ntawm prefabricating ntau yam duab thiab ntau thiab tsawg los ntawm calenders los yog extruders hu ua molding.
6.Vulcanization
Cov txheej txheem ntawm kev hloov cov roj hmab yas rau hauv cov roj hmab elastic hu ua vulcanization.Nws yog txhawm rau ntxiv qee tus nqi ntawm vulcanizing tus neeg sawv cev xws li sulfur, vulcanization accelerator, thiab lwm yam. Cov kab molecules ntawm cov roj hmab nyoos yog hla-txuas rau ib leeg los tsim ib qho kev sib txuas ntawm peb-dimensional los ntawm kev tsim ntawm "sulfur txuas hniav", yog li ntawd cov yas roj hmab compound ua ib tug heev elastic vulcanizate.
Post lub sij hawm: Mar-29-2022