Extrusion ntawm TPU (Thermoplastic Polyurethane)

1. Kev npaj khoom siv

• TPUPellet Xaiv: XaivTPU pelletsnrog rau qhov tsim nyog hardness (shore hardness, feem ntau yog li ntawm 50A - 90D), melt flow index (MFI), thiab cov yam ntxwv ntawm kev ua tau zoo (xws li, siab abrasion tsis kam, elasticity, thiab tshuaj tiv thaiv) raws li qhov kawg khoom yuav tsum tau.
• Kev ziab:TPUyog hygroscopic, yog li nws yuav tsum tau ua ntej - qhuav ua ntej extrusion kom tshem tawm cov dej noo. Cov dej noo tuaj yeem ua rau npuas, qhov chaw tsis zoo, thiab txo cov khoom siv hauv cov khoom extruded. Kev ziab yog feem ntau ua tiav ntawm qhov kub ntawm 80 - 100 ° C rau 3 - 6 teev.

2. Extrusion txheej txheem

• Extruder Cheebtsam
  • chim: Lub thoob ntawm lub extruder yog rhuab nyob rau hauv ntau qhov chaw kom maj mam yaj cov TPU pellets. Qhov kub thiab txias profile yog ua tib zoo teem kom zoo melting tsis dhau - cua sov cov khoom, uas yuav ua rau degradation. Piv txwv li, qhov chaw pub khoom kub yuav nyob ib puag ncig 160 - 180 ° C, thaj chaw compression nyob ib puag ncig 180 - 200 ° C, thiab thaj chaw ntsuas thaj tsam ntawm 200 - 220 ° C, tab sis cov txiaj ntsig no tuaj yeem sib txawv nyob ntawm qib TPU.
  • Ntsia Hlau: Cov ntsia hlau tig nyob rau hauv lub thoob, conveying, compressing, thiab melting lubTPU pellets.Cov ntsia hlau sib txawv (xws li, ib leeg - ntsia hlau lossis ntxaib - ntsia hlau extruders) tuaj yeem cuam tshuam rau kev sib xyaw, melting efficiency, thiab tso zis tus nqi ntawm cov txheej txheem extrusion. Twin - ntsia hlau extruders feem ntau muab kev sib xyaw zoo dua thiab ntau yam sib xws, tshwj xeeb tshaj yog rau cov qauv tsim.
• Melting thiab Mixing: Raws li TPU pellets txav los ntawm lub thoob, lawv maj mam yaj los ntawm kev sib xyaw ntawm cov cua sov los ntawm lub thoob thiab shear generated los ntawm cov ntsia hlau tig. Lub molten TPU yog sib xyaw kom huv si kom ntseeg tau tias homogeneous yaj.
• Tuag Tsim thiab Shaping: Lub molten TPU yog ces yuam los ntawm ib tug tuag, uas txiav txim siab tus ntoo khaub lig - seem duab ntawm cov khoom extruded. Cov tuag tuaj yeem raug kho los tsim cov duab sib txawv, xws li puag ncig rau cov raj, duab plaub rau profiles, lossis tiaj tus rau nplooj ntawv thiab zaj duab xis. Tom qab dhau los ntawm kev tuag, lub extruded TPU yog txias thiab solidified, feem ntau yog dhau los ntawm cov dej da dej los yog siv cua txias.

3. Ncej – Ua

• Calibration thiab Sizing: Rau qee cov khoom siv extruded, calibration thiab sizing yuav tsum tau ua kom paub meej qhov ntev. Qhov no yuav suav nrog kev siv lub tes tsho calibration, lub tshuab nqus tsev twj tso kua mis, lossis lwm yam khoom siv los tswj cov kab uas hla, tuab, lossis lwm qhov tseem ceeb ntawm cov khoom.
• Txiav lossis Winding: Nyob ntawm daim ntawv thov, cov khoom siv TPU extruded yog txiav rau hauv qhov ntev (rau profiles, raj, thiab lwm yam) los yog qhov txhab rau yob (rau nplooj ntawv thiab zaj duab xis).