Kaum txoj kev molding -- ya raws nyob rau hauv yas granules

Qhuav cov ntaub ntawv yas
Feem ntau engineering plastics xav kom cov dej noo hauv cov khoom qis dua li qhov muaj nqis tshaj plaws. Txawm hais tias cov plastics yuav tsum tau qhuav tsuas yog nyob ntawm qhov rhiab heev ntawm cov ntaub ntawv raw rau ya raws. Feem ntau, cov dej noo ntawm cov ntaub ntawv yas muaj feem xyuam rau kev thauj mus los, hom ntim thiab lub sijhawm khaws cia.
Piv txwv li, polyamide (PA) feem ntau yog thauj hauv hnab. Lub hnab zoo li no siv txhuas ua cov txheej txheem dej tsis zoo, yog li nws tuaj yeem qhib ncaj qha los nqa tawm cov khoom siv. Txawm li cas los xij, cov khoom siv raw ntawm feem ntau polyamide (nylon) ua cov nroj tsuag yuav tsum tau qhuav ua ntej, txawm tias qee cov neeg ntseeg tias yog cov yas siv tsawg dua ib teev, nws tsis tas yuav qhuav.
Ntawm qhov tod tes, PET thiab PBT yog cov rhiab heev rau cov dej noo, thiab yuav tsum tau qhuav kom ntseeg tau tias qhov cuam tshuam lub zog ntawm cov khoom tsis cuam tshuam. Tsis tas li ntawd, cov resins yuav nqus dej dua sai sai tom qab ziab. Yog li ntawd, qee zaum, cov chaw tsim khoom lag luam yuav tsum tau saib xyuas tshwj xeeb kom tsis txhob siv cov thawv qhib thaum lub sijhawm thauj mus los thiab xa cov PBT thiab PET resins. Nyob rau tib lub sijhawm, lub sijhawm khaws cia ntawm cov resin nyob rau hauv lub loading hopper yuav tsum tau xav txog.
Hauv cov huab cua tsis zoo, cov dej noo absorbed los ntawm PET hauv 10 feeb tuaj yeem tshaj qhov siab tshaj plaws ntawm cov khoom noo noo los ntawm 0.02 feem pua. Kev saib xyuas tshwj xeeb yuav tsum tau them rau cov khoom siv rov ua dua tom qab ziab thiab crushing los yog cov khoom siv granular saturated nrog dej nqus (xws li thaum muab tso rau hauv ib lub thawv hauv qab qhib).
Nyob rau hauv cov ntaub ntawv no, lub sij hawm kom qhuav qhuav feem ntau tsis tau raws li qhov yuav tsum tau. Siab saturated polyamide nylon yuav tsum tau qhuav rau tsawg kawg 12 teev. Nyob rau hauv no qhuav qhuav, yellowing ntawm cov ntaub ntawv yog tiag tiag inevitable
Yog li, cov lus qhia hauv qab no yuav tsum tau ua raws li:
1. Cov khoom siv rov ua dua tshiab hauv cov dej ntws yuav tsum muab khaws cia thiab rov ua dua rau hauv lub thawv kaw;
2. Yog tias tsuas yog ib feem ntawm cov khoom siv, lub thawv lossis lub hnab yuav tsum raug kaw;
3. Lub hopper loading yuav tsum tau them.
Yuav ua li cas kom qhuav yas
Yuav kom tau txais cov khoom yas zoo, cov txheej txheem ziab kom raug yuav tsum tau ua. Piv txwv li, ntau hom kev ziab cua kub yooj yim tsis tuaj yeem siv los ua kom qhuav polyester engineering yas, tab sis cua tshuab ziab khaub ncaws (dehumidification dryers) uas tshem tawm cov dej noo tuaj yeem siv tau. Tsuas yog cov khoom siv uas tuaj yeem ua kom ruaj khov thiab txaus kom qhuav nyob rau hauv ib puag ncig sib txawv yuav tsum tau siv.
Ntxiv nrog rau kev soj ntsuam qhov kub kom qhuav, nws tseem ceeb heev kom ntseeg tau tias cov dej lwg hauv cov huab cua qhuav yog qis dua 20 degree. Thaum siv ntau lub thawv ntim nrog cov khoom sib txawv thiab qhov ntom ntom ntom, nws yuav tsum ua kom txhua lub ntim khoom tuaj yeem ua tiav cov huab cua txaus los.
Ntsuas cov dej
Cov dej noo hauv cov khoom yas tuaj yeem ntsuas tau los ntawm qee qhov ntsuas, xws li ntsuas ntsuas siab lossis cov cuab yeej siv Karl Fischer txoj kev. Txhawm rau tshem tawm qhov kev ntsuas qhov yuam kev, cov qauv yuav tsum raug xaiv los ntawm qhov qis ntawm cov khoom noj hopper thiab muab kaw rau hauv lub thawv tsim nyog.
Polyethylene thiab aluminium ntau txheej cov hnab ntim khoom siv tuaj yeem siv rau cov qauv ntim nrog cov txheej txheem cua sov, los yog ntim cov iav ntim rau kev sim siv tau.