PET Daim Ntawv Txheej Txheem

Raw khoom ntawm PET daim ntawv #pet sheet extrusion

PET daim ntawv, raws li lwm yam yas, qhov kev ua tau zoo muaj feem xyuam rau qhov hnyav molecular, thiab cov yam ntxwv viscosity txiav txim siab qhov hnyav molecular. Qhov ntau dua qhov intrinsic viscosity, qhov zoo ntawm lub cev thiab tshuaj. tab sis qhov tsis zoo fluidity, ua rau molding nyuaj. Qhov qis dua qhov viscosity ntawm lub cev yog, qhov phem ntawm lub cev muaj zog thiab kev cuam tshuam lub zog. Yog li, 0.8dl / G-0.9dL / g yuav tsum raug xaiv rau cov yam ntxwv viscosity ntawm PET pob tshab zaj duab xis.

PET txheej txheem #extrusora de garrafa tsiaj

Cov khoom siv tseem ceeb ntawm PET pob tshab ntawv yog: crystallization ntauwd, ntauwd ziab, extruder, pwm taub hau, peb-yob calender thiab coiler.

Cov txheej txheem ntau lawm yog raws li nram no: raw khoom crystallization → ziab → extrusion plasticizing → extrusion molding → calendering molding → winding khoom.

Thawj kauj ruam yog crystallization. Cov PET hlais yog rhuab thiab crystallized nyob rau hauv lub crystallization ntauwd, kom cov molecules yog teem kom zoo, thiab ces lub iav hloov kub ntawm lub slices yog tsa, uas yog aimed ntawm tiv thaiv adhesion thaum lub sij hawm qhuav txheej txheem thiab thaiv lub hopper. Crystallization feem ntau yog ib kauj ruam tseem ceeb, siv 30 feeb mus rau 90 feeb, thiab qhov kub yog tsawg dua 149 ° C.

Kauj ruam ob, qhuav. Vim tias hydrolytic degradation ntawm PET tshwm sim los ntawm dej nyob rau hauv qhov kub thiab txias, nws cov yam ntxwv adhesion yog txo, thiab nws lub cev muaj zog, tshwj xeeb tshaj yog cuam tshuam lub zog, yuav raug txo nrog txo qhov hnyav molecular. Yog li ntawd, PET yuav tsum tau qhuav ua ntej melting thiab extrusion kom txo cov dej noo, thiab cov ntsiab lus noo noo yuav tsum tsawg dua 0.005%. Vim yog cov khoom siv hygroscopic ntawm cov khoom siv PET, dej tob rau hauv qhov chaw ntawm daim ntawv yuav tsim molecular bonds, thiab qee cov dej yuav muaj nyob rau hauv cov hlais, ua rau kom qhuav nyuaj, yog li huab cua kub dav siv tsis tuaj yeem siv. Cov dej lwg ntawm cov cua kub yuav tsum tau qis dua -40 ° C, thiab cov cua kub tau dhau los ntawm lub kaw lus kaw mus rau lub tshuab ziab khaub ncaws kom qhuav tas mus li. #peb extruder tshuab.

Cov duab nthuav tawm yog los ntawm JWELL Turkey tus neeg siv khoom lub Hoobkas thaum lub Cuaj Hli. Tom qab xa los ntawm Jwell Hoobkas mus rau Qaib Cov Txwv tus neeg siv khoom fatory, Jwell engineer tau mus rau lub Hoobkas los nruab PET ntawv extrusion tshuab rau thermoforming ntim. #rpet yas rov siv dua

Qhov thib peb kauj ruam yog extrusion molding. PET yog hloov mus rau hauv ib lub polymer nrog pom tseeb melting point tom qab crystallization thiab ziab, thiab molding kub ntawm polymer yog siab thiab kub tswj ntau yam yog nqaim. Lub unmelted hais yog sib cais los ntawm cov yaj siv lub barrier ntsia hlau tshwj xeeb uas tsim los rau polyester, uas yuav pab kom muaj ib tug ntev shearing txheej txheem thiab ua rau kom lub extruder cov zis. Lub taub hau hloov tau yooj yim nrog cov kab khiav nres yog siv, lub taub hau yog conical, streamlined flow channel thiab tsis khawb qhov di ncauj qhia tias daim ntawv yuav tsum zoo, lub rhaub ntawm lub taub hau muaj kev ua haujlwm ntawm cov dej thiab ntxuav, Lub taub hau tuag di ncauj qhov sib txawv yuav tsum xyuas kom meej zoo uniformity, lub taub hau tuag di ncauj qhov txawv uniformity ncaj qha cuam tshuam rau transverse thickness sib txawv ntawm daim ntawv thiab lub flatness ntawm lub calendering. Qhov ntsuas kub sib haum rau thaj tsam pem hauv ntej, thaj tsam nruab nrab ntawm lub fuselage, thaj tsam tom qab ntawm lub fuselage, lub net hloov pauv thiab lub taub hau yog 240 ° C-260 ° C, 265 ° C-275 ° C, 260 ° C- 265 ° C, 260 ° C-265 ° C, 255 ° C-265 ° C. # tsiaj ntawv tshuab

Kauj Ruam 8: Txias thiab teem caij. Tom qab cov yaj tuaj tawm ntawm lub taub hau ncaj qha mus rau hauv peb-yob calender rau calender thiab txias, qhov kev ncua deb ntawm peb-roll calender thiab lub taub hau feem ntau yog khaws cia ntawm li 40cm, vim hais tias yog qhov deb heev, daim ntawv yooj yim. sag thiab wrinkles, ua rau cov ntawv tsis zoo. Tsis tas li ntawd, vim qhov kev ncua deb ntau dhau, cov cua sov dissipation txias qeeb dhau thiab cov crystallization yog dawb, uas tsis haum rau calendering. Peb lub calendering chav tsev muaj peb lub sab sauv, nruab nrab thiab qis, qhov nruab nrab cov menyuam kab yog tsau, thiab cov axis ntawm lub sab sauv thiab qis dua ob lub rollers tuaj yeem txav mus los thaum qhov kub ntawm qhov yob nto yog 50 ° C. -30 ° C thaum lub caij txias calendering. Los ntawm kev txav mus los ntawm cov axis los kho qhov sib txawv ntawm qhov sib txawv, qhov kub ntawm ob sab thiab qis dua yog 60 ° C-52 ° C, 68 ° C-100 ° C, raws li, peb lub rollers yuav tsum xyuas kom meej tias qhov ceev yog synchronized, qhov ceev yuav tsum siab tshaj qhov extrusion ceev, lub hom phiaj yog kom offset expansion ntawm cov ntaub ntawv uas tawm hauv lub tuag thiab tsis muaj zog lub sab hauv ntawm daim ntawv, thiaj li hais tias cov wrinkles ploj. PET yuav tsim crystallization nyob rau hauv thaj tsam ntawm 250 ° C mus rau 140 ° C, thiab tus nqi crystallization yog 180 ° C mus rau XNUMX ° C thaum nws ceev, yog li crystallization tuaj yeem ua tiav hauv ob peb feeb. PET yuav tsum tau ceev nrooj dhau ntawm qhov kub ntawm qhov chaw crystallization thiab tswj qhov kub ntawm peb-yob.

Kauj Ruam 5: rub thiab rub. Daim ntawv tawm los ntawm lub calender roller thiab nkag mus rau hauv lub traction ntaus ntawv los ntawm cov ntawv qhia cov menyuam. Cov cuab yeej traction yog tsim los ntawm cov roj hmab cov menyuam yaus thiab cov roj hmab passive, thiab lub siab ntawm ob lub chais yog tsuas yog los tiv thaiv daim ntawv los ntawm flattened thaum daim ntawv yog rub los ntawm ob lub rollers mus rau lub tshuab winding.