Polyvinyl chloride PVC kev ua tau zoo thiab kev txhaj tshuaj molding txheej txheem

Vim tias nws cov nqi qis, cov khoom siv PVC muaj cov khoom siv los tiv thaiv kab mob, muaj zog thiab muaj zog, muaj cov tshuaj tiv thaiv zoo, thiab muaj qhov shrinkage ntawm 0.2-0.6%. Cov khoom lag luam tau nce ntxiv hauv cov khoom siv hluav taws xob, tshuab, kev tsim kho, khoom siv niaj hnub, khoom ua si, thiab ntim khoom. Raws li cov yam ntxwv ntawm cov khoom siv PVC, cov txheej txheem txhaj tshuaj molding ntawm cov khoom raug tshuaj xyuas raws li hauv qab no:


1. Cov yam ntxwv ntawm cov khoom siv PVC

Lub thermal stability ntawm PVC yog tsis zoo, lub molding kub yog ze rau lub decomposition kub, lub fluidity tsis zoo, thiab cov tsos yog ib qho yooj yim mus tsim defects. Additives feem ntau yuav tsum tau ua kom nws fluidity. Nws lub zog, hluav taws xob rwb thaiv tsev thiab tshuaj lom neeg ua haujlwm zoo.

2. Pwm thiab rooj vag tsim

Txhawm rau ua kom lub voj voog txhaj tshuaj, qhov luv ntawm qhov chaw txhaj tshuaj, qhov zoo dua, ntu ntu yuav tsum yog ncig, qhov tsawg kawg nkaus txoj kab uas hla ntawm lub qhov ncauj lub qhov ncauj yog 6 hli, nws yog lub khob hliav qab, thiab lub kaum sab xis yog 5 degrees. . Nws yog qhov zoo tshaj rau ntxiv cov dej txias thiab cov khoom txias. Lub qhov dej tuaj yeem tiv thaiv cov ntaub ntawv tsis zoo ntawm cov khoom siv los ntawm kev nkag mus rau hauv pwm kab noj hniav, thiab cov ntaub ntawv no yuav cuam tshuam rau kev hloov pauv ntawm qhov chaw thiab lub zog ntawm cov khoom.

Lub kaum sab xis yuav tsum nyob nruab nrab ntawm 0.50 thiab 10 kom ntseeg tau tias muaj cov khoom cua txaus hauv cov kab noj hniav. Qhov feem ntau siv qhov cua yog 0.03-0.05mm sib sib zog nqus thiab 6mm dav, los yog qhov perimeter clearance ntawm txhua thimble yog 0.03-0.05 hli. Cov pwm yuav tsum tau ua los ntawm stainless hlau los yog plated nrog nyuaj chrome.

3. PVC molding txheej txheem

PVC yog cov yas uas muaj cua sov. Overheating los yog overheating shearing yuav ua rau decomposition thiab kis tau sai heev, vim hais tias ib yam ntawm cov khoom decomposition (xws li kua qaub los yog HCI) yuav tsim ib tug catalytic nyhuv, ua rau cov txheej txheem decompose ntxiv, thiab acidic tshuaj yuav tua cov hlau thiab ua rau nws hloov. Yog hais tias nws yog dented, txheej tiv thaiv ntawm cov hlau yuav tev tawm, ua rau xeb, uas yuav ua rau muaj kev phom sij ntau rau tib neeg lub cev.

Cov ntsia hlau ntev-rau-inch piv yog 18-24: 1, peb theem piv yog 3: 5: 2, thiab compression piv yog 1.8-2. Thaum cov ntsia hlau nyob rau hauv qhov chaw, qhov kev ncua deb ntawm lub taub thiab lub nozzle yuav tsum yog 0.7-1.8 hli, lub hau yuav tsum yog stainless hlau los yog chrome-plated.

Ntsia Hlau Gasket: Cov ntsia hlau gasket yog nruab nrab ntawm 2mm thiab 3mm. Cov cib fim loj muaj ntau dua.

Txhaj ntim: Lub sijhawm khaws cia ntawm lub tog raj kheej yuav tsum tsis pub tshaj 3 feeb.

Lub tog raj kheej qhov kub thiab txias: Qhov ntsuas kub muab tsuas yog siv tau raws li kev siv. Ua kom haum raws li qhov tseeb ntawm lub tshuab thiab cov khoom siv raw, lossis nws yuav dhau qhov kev pom zoo.


Lub sij hawm nyob hauv lub thoob: nyob rau hauv qhov ntsuas kub ntawm 2000C (cov khoom siv), lub sijhawm nyob hauv lub thoob tuaj yeem tshaj 5 feeb ntawm feem ntau

Kev txhaj tshuaj nrawm: Kev txhaj tshuaj nrawm yuav tsum qeeb, txwv tsis pub ntau dhau shearing yuav degrade cov khoom. Thaum UPVC yog siv los tsim cov khoom lag luam tuab tuab heev, yuav tsum siv ntau theem kev txhaj tshuaj nrawm. Yog hais tias lub teeb xim av kab txaij tawm ntawm lub rooj vag, nws txhais tau hais tias txhaj tshuaj ceev ceev heev.

Backpressure: Feem ntau siv nto tus nqi yog 5bar. Kev nce siab hauv qab yog qhov tsim nyog rau kev sib xyaw xim thiab tso pa tawm, tab sis lub backpressure yuav tsum tsawg li tsawg tau.

Kev kaw: Vim tias qhov tsis tshua muaj cua sov ntawm PVC, qhov kev kaw yog qhov tseem ceeb heev. Ntxuav lub thoob kom tsis txhob tawm hauv PVC. Lwm cov thermoplastics uas muaj kev ruaj ntseg siab tshaj plaws tab sis tsis kam tiv thaiv PVC tuaj yeem siv tau (xws li PMMA, PP, LDPE, lossis GPPS), tsis txhob sib xyaw POMTUPVC hauv tib lub thoob, txwv tsis pub, nws yuav ua rau muaj tshuaj lom neeg ntau dhau thiab ua rau muaj kev puas tsuaj loj. lub tshuab.

Kev sib xyaw ua ke: Qhov siab tshaj plaws sib xyaw ntawm cov khoom siv nozzle yog 20%, txwv tsis pub nws yuav cuam tshuam rau cov khoom zoo.