LDPE yog iblow-density polyethylene, uas yog npaj los ntawm polymerization ntawm ethylene monomer catalyzed los ntawm ib tug dawb radical pib thiab tsis muaj lwm yam copolymer.Nws cov yam ntxwv molecular yog heev branching degree, nrog ib tug loj tus naj npawb ntawm ntev branched chains, vim kev sib nrig sib entanglement ntawm molecular chains, thiaj li hais tias nws toughness yog tsis zoo, tsis muaj peev xwm loj feem ntawm stretch, tsis tshua muaj peev xwm.
Nyob rau tib lub sij hawm, vim nws high branching degree, nws muaj ib tug siab yaj lub zog, uas plays ib tug tseem ceeb luag hauj lwm nyob rau hauv stabilizing lub membrane npuas.Vim lub unwinding ntawm cov molecule nyob rau hauv tus txheej txheem ntawm shear, nws muaj cuab kev shear thinning yam ntxwv, thiab cov yaj viscosity yog heev txo nyob rau hauv siab shear, uas coj zoo extrusion ua kev ua tau zoo, manifested raws li qis yaj siab, qis melting kub thiab lub cev muaj zog load. .
Vim yog cov yam ntxwv saum toj no, LDPE tuaj yeem siv tau yooj yim hauv kev tsim qauv kom ua tiav qhov kev xav tau.Feem ntau muaj cov nram qab no yam:
1. Txhim kho machining kev ua tau zoo
Nrog rau kev lag luam nce ntxiv rau kev ntim khoom, kev siv metallocene kuj tseem muaj ntau dua thiab ntau dua, txawm hais tias kev ua haujlwm ntawm metallocene zoo heev, tab sis kev ua haujlwm feem ntau nws cov ribs mos, feem ntau nyob rau hauv cov txheej txheem extrusion los tsim cov cua sov ntau dhau, lub siab. nce, qhov kub nce, lub npuas npuas tsis ruaj khov.Qhov no tuaj yeem txhim kho los ntawm kev sib xyaw LDPE, qhov sib piv ntxiv tuaj yeem yog 15-30%, yog tias qhov sib ntxiv sib ntxiv yog siab dhau, nws yuav cuam tshuam ncaj qha rau lub cev kawg ntawm cov yeeb yaj kiab, uas yuav tsum tau sib npaug.
2. Txhim kho qhov muag pom kev ua haujlwm
Qee cov yeeb yaj kiab muaj qee qhov kev xav tau rau cov khoom siv kho qhov muag.Linear lossis metallocene LLDPE muaj cov khoom siv kho qhov muag dav dav, feem ntau vim tias nws cov siv lead ua sab hauv loj heev.Yog tias 5-15% LDPE ntxiv rau nws, nws yuav pab txo qis cov khoom siv lead ua sab hauv, txhawm rau txhim kho huab cua thiab pob tshab.
3. Txhim kho lub tshav kub foob kev ua haujlwm
Lub thermal sealing kev ua tau zoo ntawm linear lossis metallocene LLDPE yog qhov zoo dua li ntawm LDPE.Txawm li cas los xij, vim yog cov qauv ntawm cov qib siab siab thiab siab yaj viscosity ntawm qis shear, LDPE tuaj yeem tiv thaiv cov cua sov sealing tsis xws luag tshwm sim los ntawm ntau extrusion ntawm tshav kub sealing zaj duab xis thaum tshav kub sealing.Nyob rau tib lub sijhawm, tus nqi tsim nyog ntawm LDPE tuaj yeem txhim kho cov thermal bonding zog, tab sis tus nqi yuav tsum tsis txhob ntau dhau.Txwv tsis pub, nws yuav ua rau lub tshav kub foob tsis zoo.
4. Lwm yam kev txhim kho kev ua haujlwm
Piv txwv li, hauv zaj duab xis shrinkage los txhim kho cov thermal shrinkage thiab shrinkage tus nqi;Qhov tshwm sim ntawm tsov cov cim tuaj yeem txhim kho los ntawm cov yeeb yaj kiab winding.Txhawm rau txhim kho lub caj dab tshwm sim hauv cov yeeb yaj kiab casting;Nyob rau hauv lub tsev xog paj zaj duab xis los txhim kho kev ruaj ntseg ntawm daim nyias nyias npuas kom ua tau raws li qhov loj me me membrane ntau lawm, thiab lwm yam.
Nws tuaj yeem pom tau tias LDPE ua lub luag haujlwm tseem ceeb hauv kev tsim qauv ntawm cov yeeb yaj kiab nyias vim nws cov qauv molecular tshwj xeeb, thiab kev sib koom ua ke tsim nyog nrog lwm cov ntaub ntawv polymer tuaj yeem ua tiav qhov kev tsim kho kom zoo thiab txhim kho kev ua haujlwm.
Post lub sij hawm: Aug-15-2022