Raws li cov khoom ntim hloov tau yooj yim uas txuas ntxiv dov thiab yooj yim rau slit, cov txheej txheem ntawm yob zaj duab xis ncaj qha txiav txim siab nws cov microstructure, mechanical zog, thiab kev ua haujlwm. Tam sim no, cov txheej txheem kev tsim cov txheej txheem tseem ceeb suav nrog extrusion casting, extrusion tshuab moulding, thiab biaxial stretching. Txhua tus txheej txheem muaj nws tus yam ntxwv ntawm kev teeb tsa cov cuab yeej, txheej txheem txheej txheem, thiab kev tswj xyuas qhov ntsuas, thiab tuaj yeem hloov kho raws li cov khoom siv thiab cov ntawv thov kom ua tiav kev tsim khoom thiab kev ua haujlwm zoo.
Extrusion casting yog ib qho kev siv dav siv hauv kev tsim cov yeeb yaj kiab yob. Cov txheej txheem cuam tshuam nrog kev pub mis granules rau hauv extruder, cua sov thiab melting lawv, thiab ces extruding lawv mus rau hauv uniform thickness los ntawm ib tug siab -precision T- tuag. Cov nplooj ntawv no tau txias sai sai thiab zoo li nyob rau hauv qhov siab -ceev clamping ntawm cov menyuam txias txias los ua ib zaj duab xis tas li. Vim yog qhov ceev ceev txias thiab tsis tshua muaj crystallinity, cov yeeb yaj kiab uas tsim los ntawm txoj kev casting muaj siab pob tshab thiab zoo thickness uniformity. Tsis tas li ntawd, cov kab ntau lawm ceev yog qhov siab, ua rau nws tsim nyog rau cov khoom loj ntawm cov yob cov yeeb yaj kiab ua los ntawm tsawg- ntom polyethylene (LDPE), linear qis- ntom polyethylene (LLDPE), thiab qee qhov hloov kho polypropylene (PP). Thaum cov txheej txheem sib xyaw ua ke yuav tsum tau ua, ntau yam extruders thiab co-extrusion tuag tuaj yeem siv los pub khoom noj ib txhij, ua tiav kev sib xyaw ua ke ntawm cov cua sov- txheej sealing, txheej txheej, thiab txheej txheej thaiv, txo cov txheej txheem poob thiab interlayer bonding txaus ntshai cuam tshuam nrog cov txheej txheem lamination.
Cov txheej txheem extrusion tshuab moulding siv lub nplhaib tuag rau extrude molten resin rau hauv preform, tom qab ntawd txhaj cov cua compressed los ua rau sab nraud nthuav dav, thaum ib txhij ncab nws longitudinally nyob rau hauv qhov kev txiav txim ntawm ib tug traction ntaus ntawv. Tom qab kho los ntawm lub nplhaib cua txias, nws raug mob rau hauv zaj duab xis. Cov txheej txheem no muaj cov cuab yeej siv qis qis, kev ua haujlwm siab ua haujlwm yooj yim, thiab tsim nyog rau kev tsim cov yeeb yaj kiab txuas ntxiv nrog cov dav dav thiab cov tuab tuab, tshwj xeeb tshaj yog nyob rau hauv LLDPE thiab LDPE ib leeg lossis yooj yim sib xyaw tshuab. Qhov sib piv ntawm qhov sib piv thiab qhov sib piv sib piv muaj qhov cuam tshuam loj rau lub zog transverse, nruj, thiab pob tshab ntawm zaj duab xis, yuav tsum muaj kev tswj xyuas meej thaum lub sijhawm debugging theem kom tsis txhob muaj qhov sib txawv ntawm thickness los yog cov ntsiab lus tsis muaj zog hauv zos.
Rau polypropylene nruam yob zaj duab xis, biaxial stretching yog ib kauj ruam tseem ceeb hauv kev txhim kho kev ua tau zoo. Cov txheej txheem no feem ntau cuam tshuam nrog kev ncab ntev ua raws li kev sib tw ncab thaum cov yeeb yaj kiab nyob rau hauv ib qho elasticity los yog nruab nrab crystalline xeev. Qhov no ua rau cov PP molecular chains ua kom tsis tu ncua nyob rau hauv ob qho tib si cov lus qhia thiab induce crystallization, ho txhim kho cov zaj duab xis lub zog, nruj, pob tshab, thiab barrier zog, tsim BOPP yob films. Biaxial stretching yuav tsum muaj kev tswj xyuas qhov kub thiab txias, ncab tus nqi, thiab qhov kub thiab txias; Kev hloov pauv hauv txhua theem tuaj yeem ua rau tsis sib xws molecular orientation, cuam tshuam rau cov khoom kawg ntawm cov khoom sib npaug thiab kho qhov muag zoo.
Hauv kev tshaj tawm- theem tsim, kev kho saum npoo thiab txheej txheej txheej tuaj yeem qhia tau los nthuav dav ua haujlwm. Kev kho mob Corona qhia txog pawg polar los ntawm kev tsim cov micro- tso tawm ntawm cov yeeb yaj kiab, txhim kho kev luam tawm thiab cua sov- sealing adhesion. Hauv - txheej txheej tuaj yeem faib ua haujlwm xws li tiv thaiv -fogging, antistatic, lossis roj thaiv cov khoom rau zaj duab xis, ua tau raws li qhov xav tau ntawm cov ntawv thov tshwj xeeb.
Zuag qhia tag nrho, yob zaj duab xis txheej txheem, raws li extrusion casting thiab tshuab moulding, ua ke nrog biaxial stretching thiab post-txheej txheem thev naus laus zis, tuaj yeem ua tiav kev pab cuam los ntawm ib qho - khoom mus rau ntau - txheej txheej, thiab los ntawm kev ntim khoom mus rau siab -kev ua haujlwm tsis zoo. Hauv kev xyaum ua ntau lawm, cov txheej txheem xaiv thiab kev ua kom zoo dua yuav tsum tau ua raws li cov yam ntxwv ntawm cov khoom siv, cov qauv khoom thiab cov kev xav tau kawg los xyuas kom meej tias cov yeeb yaj kiab muaj ob qho tib si zoo molding efficiency thiab ruaj khov, muab kev txhawb nqa txhim khu kev qha rau cov ntawv ntim hauv qab.