Taw qhia: Kev txhaj tshuaj moulding yog thawj cov txheej txheem hauv cov khoom ntim pleev xim kom zoo nkauj. Thawj txheej txheem feem ntau txhaj tshuaj molding, uas txhais tau hais ncaj qha txiav txim cov khoom lag luam zoo thiab cov khoom lag luam. Qhov teeb tsa kev txhaj tshuaj moulding yuav tsum txiav txim siab txog 7 yam kom yooj yim, crystallity, cua sov kev ua kom yooj yim, thermal kev ua haujlwm thiab dej txias kom haum. Kab lus no yog sau los ntawmShanghai Zaj Tshuav PobCov. Qhia tawm cov ntsiab lus muaj feem xyuam ntawm cov 7 yam no, rau koj cov phooj ywg 'siv nyob rau hauv cov khoom siv khoom ntawm koj:
Txhaj Tshuaj Molding
Txhaj tshuaj molding, tseem hu ua kev txhaj tshuaj molding, yog moulding txoj kev uas muab sib txuas nrog kev txhaj tshuaj thiab moulding. Qhov zoo ntawm kev txhaj tshuaj molding cov txheej txheem yog cov khoom siv nrawm nrawm, ntau yam ntawm cov khoom lag luam tuaj yeem siv tau me me, thiab qhov loj me yog qhov tseeb, cov khoom lag luam Yog yooj yim hloov kho, thiab nws tuaj yeem ua rau hauv cov qauv nyuaj. Qhov chaw thiab txhaj tshuaj molding yog haum rau huab hwm coj ntau lawm thiab moulding proting teb xws li cov khoom siv nrog cov duab nyuaj. Nyob rau ntawm ib qho kub thiab txias, cov khoom siv yas me me Hom no haum rau pawg ntau lawm ntawm cov chaw nrog cov duab nyuaj thiab yog ib qho ntawm cov txheej txheem tseem ceeb.
01
Kev shrinkage
Qhov xwm txheej cuam tshuam rau shrinkage ntawm thermoplastic molding yog raws li hauv qab no:
1) Hom yas: thaum lub sij hawm molding ntawm thermopastic plastics, muaj ntau cov kev ntxhov siab hauv cov tshuab hluav taws xob, muaj ntau yam kev sib cav sib ceg, muaj zog nrog cov thermoset plastics, lub shrinkage Tus nqi yog qhov loj dua, qhov chaw txaus ntshai ntau yog dav, thiab kev ua kom pom tseeb yog pom tseeb. Ib qho ntxiv, cov shrinkage tom qab molding, annealing lossis vaum cua txias yog feem ntau ntau dua li cov thermosetting plastics.
2) Cov yam ntxwv ntawm cov yas. Thaum cov khoom siv molten yog nyob hauv kev sib cuag nrog thaj chaw ntawm cov kab noj hniav, cov txheej sab nraud tau ua kom txias tam sim ntawd los ua lub plhaub qes. Vim yog cov neeg txom nyem thermal conductivity ntawm cov yas, cov txheej hauv cov yas yog maj mam txias txheej nrog loj shrinkage. Yog li ntawd, lub phab ntsa tuab, qeeb txias, thiab high-ceev txheej txheej tuab yuav ci ntau.
Tsis tas li ntawd, muaj cov txheej txheem thiab cov txheej thiab kom muaj nuj nqis ntawm cov khoom ntws, kev faib tawm ntom ntom ntom thiab shrinkage tsis kam. Yog li ntawd, cov yam ntxwv ntawm cov khoom yas muaj qhov cuam tshuam ntau dua ntawm kev shrinkage thiab kev paub.
3) Xws li xws li daim foos, loj me, thiab faib cov khoom pub dawb cuam tshuam nrog cov khoom ntws, ntom sprution, siab ua haujlwm thiab lub sijhawm moulding. Cov chaw nres nkoj ncaj qha thiab pub cov chaw nres nkoj nrog cov chaw nres nkoj loj (tshwj xeeb tshaj yog cov chaw nres nkoj tsawg dua tshiab uas muaj qhov dav thiab qhov ntev muaj tsawg dua. Cov uas nyob ze rau cov pub nyob rau hauv inlet lossis sib txuas rau cov kev taw qhia ntawm cov khoom ntws yuav txiav ntau dua.
4) Moulding qhov xwm txheej lub pwm kub yog qhov siab, cov khoom siv molten txias maj mam, lub ntom yog qhov siab, thiab shrinkage yog loj. Tshwj xeeb tshaj yog rau cov khoom siv crystalline, lub shrinkage yog ntau dua vim yog lub crystallinity thiab loj hloov. Lub puab tsaig tso tawm kuj cuam tshuam nrog sab hauv thiab sab nraud txias thiab txawv txav ntawm cov yas thiab kev taw qhia ntawm cov shrinkage ntawm txhua feem.
Ib qho ntxiv, tuav siab thiab sijhawm ntau dua ntawm kev cog lus, thiab kev cog lus me dua tab sis qhov kev coj zoo dua thaum lub siab yog siab thiab ntev. Kev txhaj tshuaj siab yog qhov siab, qhov txawv txav viscosity yog qhov me me, thiab cov shrakeer sib luag yog loj, yog li cov shrinkage tseem tuaj yeem txo los ntawm tus nqi tsim nyog. Cov khoom kub yog qhov siab, lub shrinkage yog loj, tab sis cov kev coj ua yog me me. Yog li ntawd, kho cov pwm ua kom sov, siab, lub sijhawm nrawm, lub sijhawm txias, hloov sij hawm txias thaum lub sij hawm molding kuj tseem hloov mus rau shrinkage ntawm cov yas.
Thaum tsim cov pwm, raws li qhov tsis yooj yim ntawm cov yas, qhov loj me ntawm txhua feem ntawm ib feem ntawm ib feem ntawm cov yas sib txawv yog txiav txim siab raws kev paub, thiab Tom qab ntawd cov kab tsuag loj yog xam.
Rau high-precision yas seem thiab thaum nws nyuaj rau tsuab tuav cov kev coj ua, cov hauv qab no feem ntau yuav tsum tau siv los tsim cov pwm:
Siv ib qho kev sib tw me me rau cov cheeb tsam sab nraud ntawm lub taub yas, thiab ib chav kom tawm hauv cov kab hauv qab, yog li kom tawm hauv chav kho tom qab kuaj cov pwm.
Kev sim pwm txiav txim siab daim foos, qhov loj me thiab molding cov xwm txheej ntawm cov kev hloov pauv.
Cov khoom yas yuav tsum tau tshaj tawm cov txheej txheem raug ua kom txiav txim siab qhov hloov pauv loj (kev ntsuas yuav tsum yog 24 teev tom qab hais tias yuav ua rau).
Kho cov pwm raws li qhov tseeb shrinkage.
Rov ua cov pwm thiab ua kom hloov cov txheej txheem kom zoo me ntsis kom hloov kho tus nqi shrinkage kom tau raws li cov kev xav tau ntawm cov yas.
02
dej txhawv
1) Lub cev ntawm thermopastics feem ntau tuaj yeem txheeb xyuas los ntawm cov cim hnyav, pom tseeb, pom tseeb tias muaj zog sib tw thiab cov txheej txheem ntev / yas sib tw phab ntsa thickness).
Me me molecular hnyav, dav molecular qauv qauv kev tsis tu ncua, zoo nkauj nrog tib cov lus qhia yuav tsum tshuaj xyuas seb lawv lub fluidity yog muaj feem xyuam rau kev txhaj tshuaj molding.
Raws li cov qauv pwm tsim nyog yuav tsum tau ua, cov dej ntawm cov ziab khaub ncaws uas ib txwm siv tuaj yeem raug faib ua peb pawg:
Cov kua zoo pa zoo, PE, PS, PP, CA, poly (4) methylpentene;
Nruab Nrab Fluidity Polystyrene Series cob (xws li), PMMA, POM, Polyphenylene Etaws;
Tsis muaj fluentity pc, nyuaj PVC, polyphenylene ether, polysulfone, polyarylsulfone, fluoroplastics.
2) Lub fluidity ntawm ntau cov plastics kuj tau hloov vim muaj ntau yam moulding yam. Lub ntsiab tseem ceeb yog raws li hauv qab no:
①higher khoom kub nce fluity, tab sis txawv plastics muaj lawv tus kheej tsis kam thiab siab dua MFR cov txiaj ntsig (xws li cov muaj txiaj ntsig zoo (xws li) lub fluidity ntawm, pc , Ca thiab lwm plastic sib txawv heev nrog kub. Rau PE thiab pom, qhov kub tau nce lossis txo qis tsawg kev cuam tshuam rau lawv lub fluidity. Yog li ntawd, tus qub yuav tsum kho qhov kub thiab txias thaum moulding kom tswj tau fellity.
②whaden lub siab ntawm kev txhaj tshuaj molding yog nce, cov khoom siv tsis zoo, yog li kev txhaj tshuaj ntau dua, yog li kev txhaj tshuaj siab dua, yog li kev txhaj tshuaj siab dua, yog li kev txhaj tshuaj siab dua, yog li kev txhaj tshuaj siab yuav tsum tau kho kom tswj tau lub ntsej muag thaum maub.
Daim ntawv, loj me, txheej, txias lub tshuab tsim ntawm cov khoom siv pwm (xws li cov khoom siv ntawm cov kab ke, cov duab ntawm cov kab noj hniav, cov tso tawm) thiab lwm yam ncaj qha cuam tshuam cov khoom siv molten hauv cov khoom siv fluidity sab hauv, yog tias cov khoom siv molten tsis kam, cov kua dej yuav txo qis. Thaum tsim qauv pwm, tus qauv tsim nyog yuav tsum tau xaiv raws li cov fluidity ntawm cov yas siv.
Lub sijhawm molding, cov khoom kub, txhaj tshuaj thiab cua kub, kev nqus ceev thiab lwm yam kev tsim nyog kho cov kev xav tau ntawm cov kev xav tau moulding.
03
Crystallinity
Thermoplastics tuaj yeem faib ua crystalline plastics thiab tsis paub zoo li amorphous) plastics raws li lawv tsis muaj crystallization thaum lub sijhawm ua kom lwg.
Qhov thiaj li hu ua crystallization prenomenon hais txog qhov tseeb tias thaum lub xeev yas hloov los ntawm lub xeev yas, cov lwg me me tau ywj pheej thiab ua tiav hauv lub xeev tsis zoo. Cov lwg me nyuam nres txav dawb, nias ib qho chaw me ntsis, thiab muaj ib qho kev nyiam ua cov qauv molecular ib tus qauv ib txwm muaj. Qhov tshwm sim no.
Cov tsos cov tsos rau kev txiav txim plaub ob hom plastics no tuaj yeem txiav txim siab los ntawm cov pob tshab ntawm cov tuab-hnab yas ntawm cov khoom tuab. Feem ntau, crystalline cov ntaub ntawv yog opaque lossis translucent (xws li pom, thiab lwm yam), thiab cov amorphous yog pob tshab (xws li PMMA, thiab lwm yam). Tab sis muaj kev zam. Piv txwv li, Poly (4) methylpentene yog ib tug crystalline yas tab sis muaj siab transparency, thiab ABS yog cov khoom siv amorphous tab sis tsis muaj pob tshab.
Thaum tsim cov pwm thiab xaiv txhaj tshuaj molding tshuab, xyuam xim rau cov cai hauv qab no thiab cov kev ceev faj rau crystalline plastics:
Cov cua sov yuav tsum tau nce cov khoom kub rau kev tsim qhov kub thiab txias yuav tsum muaj ntau cov cua sov, thiab cov cuab yeej siv nrog lub peev xwm loj dua.
Qhov ntau npaum li cas ntawm cov cua sov tawm thaum cua txias thiab rov ua dua tshiab, yog li nws yuav tsum txias txaus.
Cov kev sib txawv ntawm qhov sib txawv ntawm Molten State thiab cov khoom muaj zog yog loj, cov pob zeb loj tuaj yeem loj, thiab cov laj kab yog qhov tshwm sim.
Cov cua txias txias, muaj crystallinity txias, me me shrinkage thiab siab transparency. Lub crystallinity muaj feem xyuam rau phab ntsa tuab ntawm cov yas tuab yog qeeb rau qhov siab, lub shrinkage yog loj, thiab lub zog lub cev yog qhov zoo. Yog li ntawd, cov pwm kub ntawm cov khoom siv crystalline yuav tsum tau tswj hwm raws li yuav tsum tau ua.
Anisotropy yog qhov tseem ceeb thiab kev ntxhov siab sab hauv yog loj. Molecules uas tsis yog crystallized tom qab hais tias muaj kev nyiam ua txuas ntxiv mus rau crystallize, yog nyob rau hauv lub zog tsis txaus ntshai thiab warpage.
Qhov ntsuas kub crystallization kub yog nqaim, thiab nws yooj yim los ua rau cov khoom siv tsis zoo yuav tsum tau txhaj rau hauv cov pwm lossis thaiv cov chaw nres nkoj pub mis.
04
Thaum tshav kub kub-rhiab cov plastics thiab yooj yim hydrolyzed plastics
1) Cov cua sov rhiab heev txhais tau tias qee qhov plastics yog qhov rhiab dua kom kub. Lawv yuav muab rhaub kom ntev ntev ntawm cov kub lossis kub qhib yog qhov tsawg heev. Thaum cov nyhuv shearing loj, cov khoom kub yuav nce ntxiv ua kom yooj yim ua rau kev tshem tawm, kev ua tsis zoo thiab kev tsis txaus siab. Cov yam ntxwv zoo yog hu ua cov cua sov-rhiab.
Xws li nyuaj PVC, polyvinylidene chloride, pom meej copolymer, thiab lwm yam, roj av, khib nyiab thiab lwm yam los ntawm cov khoom lag luam thaum lub sijhawm ua haujlwm. Hauv tshwj xeeb, qee qhov kev txiav txim siab tawm tsam muaj kev txob tshuaj, xeb lossis tshuaj lom lossis muaj kuab lom rau tib neeg lub cev, khoom siv, thiab pwm.
Yog li ntawd, kev saib xyuas yuav tsum tau them rau pwm tsim, txhaj tshuaj molding tshuab xaiv thiab moulding. Ntsia hlau txhaj tshuaj Moulding tshuab yuav tsum tau siv. Ntu ntu ntawm lub pouring system yuav tsum loj. Lub pwm thiab barrel yuav tsum yog chrome-plated. Ntxiv stabilizer kom tsis muaj zog nws cov thermal rhiab heev.
2) Txawm hais tias qee cov plastics (xws li pc) muaj me me ntawm cov dej, lawv yuav decompose hauv qab kub thiab siab siab. Cov cuab yeej no yog hu ua yooj yim hydrolysis, uas yuav tsum tau rhuab thiab qhuav ua ntej.
05
Kev ntxhov siab tawg thiab yaj lov pob txha lov
1) qee cov yas muaj kev ntxhov siab rau kev ntxhov siab. Lawv muaj kev ntxhov siab rau sab hauv kev ntxhov siab thaum lub sij hawm molding thiab muaj nkig thiab kom yooj yim. Cov khoom yas yuav tawg ua raws li kev ua ntawm sab nraud quab yuam lossis hnyav.
Vim li no, ntxiv rau kev ntxiv cov khoom ntxiv rau cov khoom siv raw ua kom tau cov khoom siv raw, thiab cov tshuaj pwm yuav tsum tau raug xaiv los txo cov kev ntxhov siab sab hauv. Thiab yuav tsum xaiv cov duab yas uas tsim nyog, nws tsis tsim nyog rau nruab cov ntxig thiab lwm yam kev ntsuas kom txo qis kev ntxhov siab.
Thaum tsim cov pwm, lub kaum ntse ntse no yuav tsum nce ntxiv, thiab ib qho kev ua kom tsim nyog tso rau hauv inlet thiab ejectionchism yuav tsum raug xaiv. Cov khoom kub, puab tsaig kub, txhaj ntswg thiab lub sijhawm txias yuav tsum tau kho kom tsis txhob sib haum xeeb thaum lub ntsej muag yas, tom qab tov khoom siv rau tom qab kho Nthuav tawm kuj, tshem tawm sab hauv kev ntxhov siab thiab txwv tsis pub sib cuag nrog cov kuab tshuaj.
2) Thaum cov polymer yaj nrog tus nqi ntws me me dhau ntawm qhov chaw tsis muaj qhov kub thiab txias thiab kub thiab txias dua Lub cev lub cev ntawm ib feem yas. Yog li ntawd, thaum xaiv cov polymers nrog cov neeg npau taws ntawm lub nozzle, khiav yuav tsum tau nce ntxiv kom txo cov khoom kub.
06
Thermal kev kawm thiab tus nqi txias
1) Ntau yam yas muaj cov khoom thermal sib txawv xws li cov cua sov tshwj xeeb, thermal conductivity, thiab cua sov distortion kub. YOOJ YIM nrog lub zog kub tshwj xeeb yuav tsum muaj ntau npaum li cas ntawm tshav kub, thiab kev txhaj tshuaj molding tshuab nrog lub peev xwm yas loj dua yuav tsum tau siv. Lub sijhawm txias ntawm cov yas nrog cov cua sov kub distorte kub tuaj yeem ua luv thiab cov demoulding yog ntxov, tab sis txias deformation yuav tsum tau tiv thaiv tom qab kev hais kom ua.
Cov txheej txheem uas muaj tsawg thermal conductivity muaj tus nqi cua txias qeeb (xws li ionic cov polymers, thiab lwm yam), yog li lawv yuav tsum tau txias txaus los txhim kho cov tshuaj txias ntawm cov pwm. KUB khiav pwm yog qhov tsim nyog rau cov plastics nrog cov kub qis thiab kub thermal conductivity. Cov yas uas muaj cov cua sov tshwj xeeb, qis thermal conductivity, qis thermal deformation kub, thiab qeeb cua txias tus nqi tsis zoo moulding. Kev txhaj tshuaj zoo molding tshuab thiab txhim kho cov pwm kom txias yuav tsum tau xaiv.
2) Ntau qhov plastics yuav tsum muaj tus nqi kom haum kom haum raws li lawv hom, cov yam ntxwv thiab cov duab ntawm cov khoom yas. Yog li ntawd, pwm yuav tsum tau nruab nrog cua sov thiab cua txias raws li kev moulding yuav tsum muaj qee yam pwm kub. Thaum cov khoom kub nce cov pwm kub, nws yuav tsum ua kom tiv thaiv cov yas los ntawm deforming tom qab hais, luv luv lub voj voog moulding, thiab txo cov crystallinity.
Thaum cov ntaub khib nyiab yas tsis txaus kom cov pwm nyob rau ntawm qhov kub thiab txias kom tswj tau cov cua txias, xyuas kom meej fluidity, txhim kho filling cov cai lossis tswj cov yas qhov chaw kom txias maj mam. Tiv thaiv kev txias txias sab hauv thiab sab nraud ntawm tuab-walled yas thiab nce crystallofinity.
Rau cov neeg uas muaj fluidity zoo, loj molding cheeb tsam, thiab cov khoom kub tsis sib xws, qee zaum nws yuav tsum tau muab rhaub lossis txias hloov chaw thiab txias. Txog qhov kawg no, pwm yuav tsum tau nruab nrog txias txias lossis cua sov.
07
Hygroscopicity
Vim tias muaj ntau yam ntxiv rau hauv cov plastics, uas ua rau lawv muaj kev nqus cov affection ua ob hom: noo noo tsim, noo noo nplaum, thiab tsis-nplaum noo. Cov ntsiab lus dej hauv cov khoom yuav tsum tau tswj tsis pub dhau cov kev pub rau. Txwv tsis pub, noo noo yuav dhau los ua cov roj lossis hydrolyze nyob rau hauv cov kub thiab muaj kev kub siab, thiab muaj cov khoom tsis zoo thiab cov khoom siv tsis zoo thiab cov kws kho mob.
Yog li ntawd, hygroscopic plastics yuav tsum yog preheated nrog cov kev ua kom muaj cua sov uas tsim nyog los tiv thaiv rov nqus ntawm cov dej noo thaum siv.
Shanghai Zaj Tshuav Industrial Co., Ltd yog cov chaw tsim khoom, Sawmhai Zaj Ncauj Khoom muab ib qho chaw pleev tshuaj kom zoo nkauj .Yog koj nyiam peb cov khoom, koj tuaj yeem tiv tauj peb,
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Lub sijhawm Post: Sep-27-2021