Nyob rau hauv cov txheej txheem ntawm cov khoom tsim, cov khoom dents thiab pores yog qhov feem ntau tsis zoo tshwm sim.Cov yas txhaj rau hauv pwm shrinks hauv ntim thaum nws txias.Qhov saum npoo hardens ua ntej thaum nws txias ua ntej, thiab npuas tsim sab hauv.
Lub indentation yog qhov qeeb qeeb ntawm cov npuas nyob rau hauv cov kev taw qhia ntawm contraction ntawm concave nto;Lub npe hu ua stoma yog hais txog cov khoom hauv pwm solidifies los ntawm qhov chaw, uas yog qhov tsis txaus rau tag nrho cov ntim ntawm pwm.Vim li no, qhov nyob rau hauv lub tshuab nqus tsev vacuum yog generated, uas feem ntau tshwm sim nyob rau hauv lub thickness ntawm cov khoom thiab lub filling chaw nres nkoj.
Cov ntaub ntawv uas muaj shrinkage siab kuj yog ib qho yooj yim rau indentation.Thaum hloov cov txheej txheem tsim kom tshem tawm cov indentation, qhov teeb meem yuav tsum tau teem rau hauv kev coj ntawm shrinkage.Ntawd yog, pwm kub thiab chim kub txo, kev txhaj tshuaj siab nce, tab sis nws yuav tsum tau muab sau tseg tias qhov no yuav ua rau muaj kev ntxhov siab sab hauv.
Vim hais tias qhov indentation yog inconspicuous, yog li nws tsis cuam tshuam rau cov tsos ntawm cov txheej txheem nyob rau hauv lub pwm mus rau hauv corrosion, xws li striated, granular thiab thiaj li nyob.
Kev txo qhov kub thiab txias kom txo qhov ua tiav kuj tseem siv tau yog tias cov khoom siv molding yog cuam tshuam resistant polystyrene HIPS (ib hom polystyrene PS).Tab sis ib zaug ib tug hniav tshwm sim nyob rau hauv cov kev no, nws yog ib qhov nyuaj rau kho cov khoom polished.
Cov khoom pob tshab nrog lub qhov cua yog ib qho teeb meem, cov khoom opaque nrog lub qhov cua tsis muaj teeb meem rau kev siv thiab yuav tsum tsis txhob pom hauv cov khoom.
Vim yog cov dej thiab cov volatiles uas tsim los ntawm lub stomata, feem ntau yog diffused rau txhua qhov chaw ntawm cov khoom, cov duab ntawm lub stomata feem ntau me me.
Ua ntej, qhov kev daws teeb meem
Instant: nce kev txhaj tshuaj siab, ncua sij hawm txhaj tshuaj siab tuav lub sijhawm, txo qhov kub thiab pwm kub, noo noo thiab volatiles tshwm sim los ntawm cov khoom yuav tsum qhuav tag, nyob rau hauv qhov chaw ntawm indentation yuam txias.
Lub sij hawm luv luv: Sau cov ntug sab saud qhov twg qhov indentation yog ua.Qhov twg cov hniav yog tsim, cov khoom yog thickened raws li nws dhau los ntawm qhov chaw nqaim.
Lub sij hawm ntev: qhov sib txawv thickness ntawm cov khoom tsim yuav tsum zam tag nrho.Ib qho yooj yim los tsim dent reinforcement, ntev thiab nqaim duab yuav tsum luv li sai tau.Yuav tsum nce lub rooj vag, lub ntsiab channel, shunt, nozzle qhov.Txhim kho qhov tso pa tawm.
Qhov thib ob, cov ntaub ntawv siv
1 molding shrinkage ntawm cov khoom loj indentation kuj tseem loj, xws li polyethylene PE, polypropylene PP, txawm tias ntev npaum li qhov kev txhawb zog me ntsis, yuav tsim cov indentation.
| Khoom siv | Pwm shrinkage tus nqi |
| PS | 0.002 ~ 0.006 hli |
| PP | 0.01 ~ 0.02 hli |
| PE | 0.02 ~ 0.05 hli |
2. Thaum qhov kub thiab txias yog txo kom tsis muaj dents, yog hais tias cov khoom nyob rau hauv lub pwm kab noj hniav tseem nyob rau hauv lub siab, nws yuav tsum tau txiav txim siab tias yuav tsis muaj dents.Lub siab ntawm cov khoom nyob ib puag ncig cov pwm hauv pwm, uas yog, qhov siab zoo li qub, tsis tas yuav tsum nyob txhua qhov chaw.
Nyob ze rau ntawm lub rooj vag ib feem ntawm lub siab yog siab, yog hais tias cov khoom siv dav ntug, vim hais tias ntawm kev hloov ntawm siab mus rau tag nrho cov ces kaum, nyob ze ntawm lub rooj vag thiab deb ntawm lub rooj vag ntawm lub siab sib txawv nrog tag nrho cov siab piv rau ib tug me me sib txawv yuav tsis. tsim cov dents, kuj tuaj yeem tau txais tsis muaj cov khoom seem hauv kev ntxhov siab.
Thaum qee cov khoom ntws mus rau hauv qhov chaw nyuaj, muaj qhov siab siab nyob rau hauv qhov chaw no, thiab lub siab txo qis hauv lwm qhov chaw, ua rau muaj dents.Qhov no ntawm qhov siab siab residue yog qhov kev ntxhov siab sab hauv ntawm cov khoom kuj tseem loj.Nyob rau hauv qhov zoo tagnrho, cov ntaub ntawv fluidity zoo dua thaum qhov kub ntawm cov khoom nce nrog qhov kub ntawm qhov tuag, thiab kev txhaj tshuaj hauv lub xeev siab zoo kuj tseem qis dua.
3. Nyob rau hauv kev hloov ntawm txoj kev tsim, kev sib xyaw ua ke ntawm qhov kub thiab txias, siab thiab lub sijhawm yuav tsum tau ua ua ntej ntawm lub rooj, txhawm rau paub qhov tshwm sim.Ua ntej tshaj plaws, thaum lub sij hawm ntev heev, nws yog ib qho yooj yim kom paub txhua qhov kev hloov me me hauv siab.Nws yuav tsum raug sau tseg tias cov txiaj ntsig tau txais thaum qhov kub hloov pauv yuav tsum tau tsim tom qab cov khoom siv txhaj tshuaj thiab tom qab kub poob.
4. Txhawm rau txiav txim siab cov laj thawj tshwm sim los ntawm qhov pores, tsuav yog qhov kev soj ntsuam ntawm cov npuas ntawm cov khoom yas hauv pwm yog instantaneous lossis tom qab txias, yog tias thaum pwm yog instantaneous, feem ntau nws yog cov khoom siv teeb meem, yog tias nws yog tom qab txias. , nws belongs rau cov pwm los yog txhaj tshuaj.
Post lub sij hawm: 03-11-22