Muaj ntau yam khoom siv PVC ua npuas ncauj, feem ntau suav nrog cov ntaub ntawv ua npuas ncauj tawv thiab cov ntaub ntawv ua npuas ncauj (xws li cov ntaub ntawv ib leeg, tawv tawv, thiab lwm yam). Microporous yas yog ib hom ua npuas ncauj nrog txoj kab uas hla ntawm 1 ~ 10 μ M, ua npuas ncauj ntom ntawm 1X109 ~ 1 × 1012 / cm3 cov khoom ua npuas ncauj tshiab. Piv nrog cov yas tsis foamed, qhov ntom ntawm microporous plastics tuaj yeem txo los ntawm 5% ~ 95%. Tom qab microcellular foaming, PVC tsis tuaj yeem txo qhov ceev thiab txuag nqi, tab sis kuj muaj ntau yam zoo ntawm lub cev thiab cov khoom siv, xws li lub teeb yuag, lub zog muaj zog, siab toughness, zoo thermal rwb thaiv tsev thiab suab rwb thaiv tsev kev ua tau zoo, tsis tshua muaj conductivity thiab thermal conductivity, zoo nkauj tsos, kua qaub thiab alkali tsis kam, noo noo-pov thawj thiab corrosion-resistant, nplaim retardant thiab fireproof, ruaj loj, yooj yim molding, nto xim, luam ntawv los yog txheej, yooj yim ua hauj lwm zoo huab cua (yuav siv tau sab nraum zoov) thiab lwm yam superior kev kawm.

siv quav ciab rau PVC ua npuas ncauj khoom

Rigid PVC micro foamed cov ntaub ntawv muaj ntau yam kev siv, nrog rau cov laug cam (xws li foamed ko taw boards, foamed phab ntsa strips, phab ntsa thiab qab nthab panels, ru tsev coloured vuas, thiab lwm yam), foamed kav (xws li cable tiv thaiv kav, kav dej. ntawm txoj kev thiab kev tsheb ciav hlau, lub tsev kav dej, cov kav dej ua liaj ua teb, cov kav dej tiv thaiv kev lag luam, thiab lwm yam), foamed profiles (xws li kab hlau rhuav, dov shutter thav duab profiles, qhov rooj thiab qhov rais profiles Balcony vaj huam sib luag profile, sab hauv tsev thiab sab nraum zoov pem teb, thiab lwm yam.) .

① Dawb foaming yog hais txog qhov tsis muaj kev txwv tsis pub nthuav dav ntawm cov yaj sai li sai tau thaum nws tawm hauv qhov tuag, thiab tom qab ntawd nkag mus rau qhov chaw teeb tsa nrog qhov loj dua tom qab lub sijhawm luv luv. Dawb foaming ua rau tag nrho cov npuas tsim nyob rau hauv seem ntawm extrudate. Kev loj hlob ntawm npuas npuas yog txwv los ntawm kev ua kom txias, thiab thaum kawg ib qho kev nruam nruam, nruab nrab ntawm qhov tawv tawv thiab cov khoom du yog tsim. Txoj kev no muaj qhov zoo ntawm cov txheej txheem yooj yim thiab tsim nyog rau kev tsim cov khoom nrog tuab ntawm 2 ~ 6mm, yooj yim geometry thiab dull nto (xws li cov kav dej, nplooj ntawv thiab cov ntaub ntawv nrog cov geometry yooj yim).
② Cov txheej txheem ua npuas dej sab hauv, txheej txheem ntawm daim tawv nqaij los yog txheej txheem celuka tau txais kev tuag tshwj xeeb nrog cov tub ntxhais sab hauv los cais cov khoom siv yas, cov cuab yeej teeb tsa txuas nrog cov tuag, thiab nws cov contour sab nraud yog tib yam li cov tuag. Thaum cov khoom raug xa mus rau lub tes tsho nyob rau hauv pem hauv ntej ntawm lub inlet tuag, cov yaj uas muaj foaming tus neeg saib xyuas nkag mus rau hauv lub txias qhov chaw lub tes tsho sai li sai tau raws li nws tawm ntawm lub qhov ncauj zaj duab xis, thiab undergoes ceev ceev txias rau tag nrho cov nto, thiaj li tiv thaiv kev tsim. ntawm npuas npuas thiab ib qho o ntawm cov seem ntawm extrudate, thiaj li ua rau daim tawv nqaij txheej ntawm qhov chaw. Nyob rau tib lub sijhawm, cov tub ntxhais hauv qhov tuag ua rau cov kab noj hniav tsim nyob rau hauv cov khoom semi-tiav uas muaj cov npuas dej tsim los ntawm cov seem yaj, uas yog, foaming hauv. Los ntawm kev tswj qhov txias txias, cov khoom siv nrog qhov tuab ntawm 0.1 ~ 10mm thiab cov khoom phab ntsa thickness ntau tshaj 6 hli tuaj yeem tau txais. Txoj kev no tuaj yeem tsim cov profiles nrog cov duab sib luag. Cov khoom muaj cov yam ntxwv ntawm du nto, siab hardness thiab tsawg ntom nyob rau hauv cov tub ntxhais cheeb tsam. Tsis tas li ntawd, los ntawm kev sib txuas cov qauv no nrog txoj kev ①, cov khoom siv nrog cov tawv nqaij ntawm ib sab thiab lub xeev dawb ntawm sab nraud tuaj yeem tau txais.

③ Coextrusion siv lub taub hau ua ke thiab ob lub extruders los extrude cov tsis foaming nto txheej thiab foaming core txheej feem. Ntau yam lossis cov qauv ntawm ob txheej ntawm cov yas tuaj yeem hloov kho raws li qhov xav tau los ua kom cov khoom ua tau raws li qhov ceev thiab qhov loj ntawm tus qauv. Feem ntau ntawm cov tub ntxhais ua npuas dej ua hauv Suav teb yog tsim los ntawm cov txheej txheem no.
Txawm hais tias saum toj no peb txoj kev ua haujlwm muaj lawv tus kheej cov yam ntxwv hauv cov qauv sib xyaw, cov qauv tuag thiab kev siv thev naus laus zis, yuav ua li cas tswj tus cwj pwm foaming ntawm yaj thiab tau txais cov qauv ntawm tes txaus siab yog qhov teeb meem tseem ceeb hauv cov txheej txheem extrusion. Qhov kawg foaming txheej txheem ntawm cov roj yaj nyob rau hauv lub yaj tiag tiag tshwm sim "dheev" tom qab lub yaj tawm tuag. Tom qab cov yaj tawm ntawm qhov tuag, vim qhov kev poob qis ntawm ambient siab thiab qhov hloov pauv ntawm qhov kub thiab txias, cov roj yaj nyob hauv lub xeev supersaturated, cov roj-kua ob-theem sib cais, thiab ntau cov microbubbles yog tsim ntawm nucleation. taw tes. Qhov loj ntawm npuas loj hlob nyob ntawm qhov saturated vapor siab ntawm decomposition gas thiab ductility thiab lub zog ntawm yaj nws tus kheej. Ntawm ib sab, nyob rau hauv qhov kev txiav txim ntawm cov pa roj, cov npuas loj hlob tsis tu ncua; Ntawm qhov tod tes, lub zog thiab ductility ntawm cov yaj yuav txwv qhov kev loj hlob ntawm npuas thiab txiav txim siab seb npuas puas tawg lossis sib koom ua ke. Thaum lub zog nthuav tawm sab nraud ntawm cov roj sib npaug nrog lub zog viscoelastic nce los ntawm cov yaj vim txias, nws yuav tsum tau txias thiab zoo li tam sim ntawd kom tswj tau cov qauv npuas thiab tiv thaiv npuas. Hauv cov txheej txheem extrusion foaming tiag tiag, qhov tseem ceeb cuam tshuam rau qhov zoo ntawm cov khoom foamed yog los tswj cov tiam thiab kev loj hlob ntawm npuas los tsim cov qauv me me, zoo ib yam thiab ywj siab ntawm tes.
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