isicelo

I-LDPE yii-polyethylene ephantsi, elungiselelwe yi-polymerization ye-ethylene monomer catalyzed yi-free radical initiator kwaye ayinayo nayiphi na enye i-copolymer.Iimpawu zayo ze-molekyuli ziphezulu kakhulu i-branching degree, kunye nenani elikhulu lamatyathanga amade e-branched, ngenxa yokuphonswa okuhlangeneyo kwamatyathanga eemolekyuli, ukuze ukuqina kwayo kungabikho, akunakuba ngumlinganiselo omkhulu wokolula, amandla empembelelo ephantsi.

Ngexesha elifanayo, ngenxa yezinga eliphezulu le-branching, linamandla aphezulu okunyibilika, adlala indima enkulu ekuzinziseni i-bubble ye-membrane.Ngenxa yokukhululwa kwemolekyuli kwinkqubo yokucheba, ineempawu ezicacileyo zokucheba, kwaye i-viscosity enyibilikayo iyancipha kakhulu kwi-chear ephezulu, ezisa ukusebenza kakuhle kwe-extrusion processing, ebonakaliswa njengoxinzelelo oluphantsi lokunyibilika, ubushushu obuphantsi bokunyibilika kunye nomthwalo wemoto. .

Ngenxa yezi mpawu zingentla, i-LDPE ingasetyenziswa ngokuguquguqukayo kuyilo lokuqulunqa ukuphumeza umsebenzi ofunekayo.Kukho ikakhulu le miba ilandelayo:

1. Ukuphucula ukusebenza koomatshini

Ngokunyuka kweemfuno zemarike yokupakishwa, ukusetyenziswa kwe-metallocene kuninzi kwaye kukhulu, nangona ukusebenza kwe-metallocene kuhle kakhulu, kodwa ukusetyenzwa kudla ngokubakho iimbambo zayo ezithambileyo, ngokuqhelekileyo kwinkqubo yokukhupha ukuvelisa ubushushu obugqithisileyo, uxinzelelo. ukwanda, ubushushu buphakama, iqamza le-membrane alizinzile.Oku kunokuphuculwa ngokuxuba i-LDPE, umlinganiselo wokongezwa unokuba ngu-15-30%, ukuba umlinganiselo wokongezwa uphezulu kakhulu, uya kuchaphazela ngokuthe ngqo iipropati zokugqibela zomzimba zefilimu, ekufuneka zilinganiswe.

2. Ukuphucula ukusebenza kwamehlo

Ezinye iifilimu zineemfuno ezithile zeempawu ezibonakalayo.I-Linear okanye i-metallocene LLDPE ineempawu zokukhanya ngokubanzi, ngakumbi ngenxa yokuba ukukhula kwayo kwangaphakathi kwekristale kukhulu kakhulu.Ukuba i-5-15% i-LDPE yongezwa kuyo, iya kunceda ukunciphisa ubukhulu bekristal yangaphakathi, ukwenzela ukuba kuphuculwe inkungu kunye nokungafihli.

3. Ukuphucula ukusebenza kwetywina lobushushu

Ukusebenza kokutywinwa kwe-thermal ye-linear okanye i-metallocene LLDPE ingcono kakhulu kunaleyo ye-LDPE.Nangona kunjalo, ngenxa yesakhiwo se-branched degree ephezulu kunye ne-viscosity ephezulu yokunyibilika kwi-chear ephantsi, i-LDPE inokuthintela iziphene zokutywinwa kobushushu ezibangelwa kukukhutshwa okugqithisileyo kwefilimu yokutywina ubushushu ngexesha lokutywinwa kobushushu.Kwangaxeshanye, isixa esifanelekileyo se-LDPE sinokuphucula amandla okudibanisa i-thermal, kodwa isixa akufuneki sibe kakhulu.Ngaphandle koko, iya kwenza itywina lobushushu libe libi ngakumbi.

4. Olunye uphuculo lokusebenza

Ngokomzekelo, kwifilimu ye-shrinkage yokuphucula i-thermal shrinkage kunye ne-shrinkage rate;Isenzeko sokumakishwa kwamahlosi singaphuculwa ngefilimu ejijayo.Ukuphucula i-necking phenomenon kwifilimu yokuphosa;Kwifilimu ye-greenhouse yokuphucula ukuzinza kwe-membrane bubble ukufezekisa imveliso enkulu ye-membrane, njalo njalo.

Ingabonwa ukuba i-LDPE idlala indima ebaluleke kakhulu kuyilo loyilo lweefilimu ezibhityileyo ngenxa yesakhiwo sayo esikhethekileyo semolekyuli, kunye nokudityaniswa okufanelekileyo kunye nezinye izinto zepolymer kunokuphumeza ukwenziwa koyilo kunye nokuphuculwa komsebenzi.