1. Nkag siab txog peb yam tseem ceeb ntawm PE raw khoom
| Yam khoom raw | Qhov ceev (g / cm3) | Core nta | Tej kev siv |
| Tsawg- ntom polyethylene (LDPE) | 0.91 - 0.925 | Zoo heev softness, extensibility, transparency thiab processability. | Yuav tsum muaj cov ntawv hloov pauv, cov yeeb yaj kiab tiv thaiv, ntim cov hnab ntim khoom, thiab lwm yam. |
| High- ntom polyethylene (HDPE) | 0.92 - 0.965 | Hardness, tensile zog, kub tsis kam (kev pab kub txog li 100 degree) thiab creep kuj yog superior rau LDPE. | Cov ntawv yuav tsum tau muaj qee yam nruj, ntim khoom, tshuaj pallets, cov khoom zoo nkauj, thiab lwm yam. |
| Linear low -density polyethylene (LLDPE) | Ntawm LDPE thiab HDPE | Nws qhov kev ua tau zoo (tuag lub zog, kev cuam tshuam, kev tiv thaiv ib puag ncig) yog qhov zoo dua li LDPE, thaum tseem muaj kev hloov pauv thiab kub ua haujlwm. | Rau siab -cov ntawv muaj zog, hnyav- lub luag haujlwm ntim cov hnab ntim khoom, thiab sib xyaw nrog LDPE los txhim kho kev ua haujlwm. |
2.Qhia cov ntsiab lus tseem ceeb ntawm siab -cov ntaub ntawv zoo
Melt Flow Rate: Qhov no yog qhov tseem ceeb tshaj plaws ntawm kev ua haujlwm. Nws txiav txim siab flowability ntawm cov resin nyob rau hauv lub molten lub xeev. Koj yuav tsum xaiv cov qib nrog MFR ruaj khov raws li cov yam ntxwv ntawm cov ntsia hlau extruder thiab cov ntawv tuab kom ruaj khov extrusion tso zis thiab yaj siab.
Mechanical Properties: Txheeb xyuas cov ntaub ntawv xws li lub zog tensile thiab elongation ntawm kev tawg raws li qhov kawg - siv daim ntawv thov. Piv txwv li, cov nplooj ntawv uas yuav tsum tau khoov ntau zaus yuav tsum tau cov ntaub ntawv raw nrog siab elongation thaum so.
Qhov ntom ntom: Qhov ntom ntom yog cuam tshuam ncaj qha rau qhov rigidity thiab yooj ntawm daim ntawv.
Optical Properties: LLDPE tej zaum yuav tsis yog qhov kev xaiv zoo tshaj plaws yog tias yuav tsum muaj pob tshab siab (nws cov pob tshab thiab gloss feem ntau tsis zoo), thaum cov qhab nia tshwj xeeb ntawm LDPE lossis cov kev hloov pauv yuav tsim nyog dua.
3. nruj me ntsis tswj daim ntawv thiab huv si ntawm raw khoom
Siv cov ntaub ntawv qub qub tsuas yog: Rau cov kab ntau lawm extrusion nrog cov kev cai nruj, kev siv cov hmoov los yog cov khoom siv rov ua dua tshiab uas tsis paub muaj pes tsawg leeg yog txwv nruj heev. Cov ntaub ntawv zoo li no yuav muaj cov impurities, cov dej noo ntau dhau, lossis cov cwj pwm tsis ruaj khov, uas tuaj yeem ua rau ntses qhov muag (gels), npuas, xim tsis sib xws, thiab txawm tias tshuaj ntsuam clogging hauv daim ntawv, cuam tshuam rau kev tsim khoom thiab cov khoom zoo.
Tshawb xyuas cov khoom siv raw khoom sib xws: Cov khoom siv zoo tshaj plaws yuav tsum muaj xim zoo ib yam thiab qhov loj me los ntawm batch mus rau batch, tsis muaj xim txawv lossis txawv teb chaws. Qhov no ua kom muaj kev ruaj ntseg hauv cov xim thiab kev ua haujlwm ntawm cov khoom kawg.
4.Ua kom muaj kev sib txuas ntxiv
Cov khoom siv ntxiv: xws li antioxidants (kom tiv thaiv thermal degradation thaum ua), UV absorbers (los txhim kho huab cua tsis kam), plam / tiv thaiv -cov tshuaj tiv thaiv (kom tiv thaiv daim ntawv adhesion), thiab lwm yam. Cov no feem ntau yog ntxiv rau hauv daim ntawv ntawm masterbatches.
Filler masterbatch: Txhawm rau txo cov nqi lossis txhim kho cov khoom tshwj xeeb (xws li cov xim dawb thiab rigidity), muab tub lim masterbatches xws li calcium carbonate tuaj yeem ntxiv. Tus yuam sij yog los xyuas kom meej zoo dispersion ntawm muab tub lim masterbatch nyob rau hauv lub cob; txwv tsis pub, nws yuav ua rau txo cov khoom siv hluav taws xob lossis cov khoom nto ntawm daim ntawv. Dispersion tuaj yeem txiav txim siab pib los ntawm kev soj ntsuam seb puas muaj "xim xim los yog streaks" ntawm lub tshuab cua tshuab lossis cov qauv ntawv.
Xim masterbatch: Yog tias yuav tsum muaj xim xim, xim masterbatches nrog kev sib raug zoo nrog PE cov cab kuj yuav tsum raug xaiv, thiab lawv cov cua sov yuav tsum ua tau raws li qhov yuav tsum tau ua.
5.Tsim kom muaj kev ntseeg siab ntawm cov khoom siv thiab cov txheej txheem pov thawj
Xaiv cov khoom muaj npe nrov: Ua ntej lub npe nrov thoob ntiaj teb xws li SABIC, Dow, ExxonMobil, lossis loj, ntseeg tau hauv tsev petrochemical tuam txhab thiab cov tuam txhab masterbatch. Lawv tuaj yeem muab cov khoom lag luam ruaj khov thiab cov ntaub ntawv ntxaws ntxaws.
Thov thiab nkag siab txog cov ntaub ntawv kev kawm: Nug cov neeg muab khoom rau Cov Ntaub Ntawv Kev Nyab Xeeb Cov Ntaub Ntawv (MSDS) thiab cov ntaub ntawv qhia txuj ci (TDS) ntawm cov khoom, thiab xyuas seb lawv puas ua tau raws li koj cov txheej txheem lossis cov qauv kev lag luam cuam tshuam (xws li kev sib cuag zaub mov, qib kho mob, thiab lwm yam).
Ua kev sim tshuab: Ua ntej kev yuav khoom loj, nco ntsoov thov cov qauv rau kev sim tshuab me me. Saib xyuas kev ruaj ntseg, daim ntawv zoo li (ntses qhov muag, streaks), thiab seem stability nyob rau hauv cov khoom siv tiag tiag.