PP vs. HDPE: Ukukhetha Imateriali Ehlakanipileyo Yokwenza I-Drawing Yefilm Efanayo Yakho

Ukuphatha Kwemiphumela Yezindawo Ngokwesibonelo Ku- Amashini Asebenzisa Kwe-Plastic Flat Film Drawing

Indawo Yokutshisa, Ubukhulu Bokutshisa Kwemithambo, Nobukhulu Bokusebenza Kwemithambo

I-Polypropylene, noma i-PP ngokufupha, kusukela kubhala ngokuvamile kuma-160 ku-170 degrees Celsius. I-High density polyethylene (HDPE), ngakolunye uhlangothi, ibhala kuma-130 ku-135 degrees. Ukuthi i-PP ina le mpumalanga ephezulu yokuqhubeka kubhala kubiza ukuthi abahleli bafuna isikhathi esizinga sokubhala kona kabusha kabusha emuva kokuprosesa. Kodwa kukho umkhawulo wale nto futhi ngoba i-PP iyasebenza kahle kangaka xa ibhalwa ngokuvamile kuzo zinto zokubhala kwezinkulungwane, njengoko kubhala kwezinkulungwane. I-HDPE isebenza kahle kakhulu ngoba imithombo yayo iyadlula kahle kuma-dies, okuyavumela izilayini zokuprosesa ukusebenza kumkhawulo ophezulu kakhulu. Xa kufikile ekubhalweni kwazo kuzo zonke izindlela zokubhala, lezi zinhlobo zemithombo zisebenza kahle kakhulu. I-PP iyathabatha ubude obuhle kahle noma kubhekwa ngokuvamile kwezinkinga eziningi ngoba yisemi crystalline. I-HDPE ayinakho lezi zinhlobo zezindawo zokubhala ngokujulile. Imithombo yayo yisibonelo sokuthi ayizange ikhule kahle kakhulu ngokuvamile kwezinkinga. Okubalulekile kakhulu kule nto yizindlela zokubhala kwezinkulungwane. Kuma-PP, lezi zinhlobo zezinkulungwane ziyathabatha ubude obuhle kahle kuzo zonke izindlela zokubhala. Ngakolunye uhlangothi, i-HDPE ina lezi zinhlobo zemithombo ezingaphansi, okuyadinga ukuthi kubhekwe kahle kakhulu kwezindlela zokubhala kuzo zonke izindlela zokubhala, ngakolunye uhlangothi, singathola izinkulungwane ezingaphansi noma izindlela zokubhala ezingaphansi.

Ukuphulula Ukuphinda Kwesiphumo, Izindlela Zokubhala Okuqukethwe, Nokuhlolwa Kwemithambo

Ukupholisa ngokushesha kudlala indima enkulu ekugcineni ama-molecule elinganisiwe futhi agcine izakhiwo zingaphazanyiswa. I-polyethylene enobuningi obuphakeme ivame ukwakha amakristalu cishe ngamaphesenti angu-30 ngokushesha kune-polypropylene ngoba inamazinga okushisa aphansi kancane okuguquka kwengilazi (-12 degrees Celsius uma kuqhathaniswa no -10C we-PP). Lo mehluko uvumela i-HDPE ukuba ifinyelele amazinga okudonsa aphakeme njengo-9: 1, okudlula lokho okungenzeka nge-PP cishe ngo-7: 1. Ngakolunye uhlangothi, i-polypropylene ingakwazi ukubhekana namandla amakhulu kakhulu okuqondisa ngaphandle kokugqwala noma ukuhlanekezelwa, okwenza kube kuhle kakhulu kumafilimu acacile enziwe ngezinqubo zokwelula ezimbili. Lapho usebenza nge-HDPE, izinto ziba nzima lapho izinga lokushisa lidlula ama-degree Celsius angu-200. Le nto iqala ukuncipha ngenxa yokucindezelwa ukushisa, okungase kubangele ukushintshashintsha kwesilinganiso esingamamilimitha angu -0.5. I-polypropylene inikeza abakhiqizi umngcele owengeziwe wama-degree amahlanu ngesikhathi sokupholisa ngenkathi igcina ukulawula okuqinile kakhulu kokunamathela ngaphakathi kwama-0.2 mm. Lokhu kwenza i-PP ibe usizo ngokukhethekile lapho kunendaba khona ngokunemba. Ukuze i-HDPE isetshenziswe ekudwebeni okubili, izinyathelo zokucwilisa ngokucophelela zisiza ukunciphisa izinkinga ezinjengokuqina kwemilenze nemiphetho engazinzile evame ukwenzeka ngenye indlela.

Ukusebenza Kwemikhili Ngemuva Kokuhlanganisa Ku- Ukuhambisana Kwesifilm Esilungile

Ukubhekana Kwesivinini Sokuqala, Isivinini Sokuphakama, Nokukhula Kwezinhlobo Zokuhlanya

Ukuphakanyiswa kwe-madirection (MD) kubiza ngokukhethekile impumelelo yokuqinisa nokuthi i-modulus yezinto eziyisibonelo sezinkulungwane zase-pp (polypropylene) ne-HDPE (high density polyethylene). Uma sibheka izinombolo zokugcina, i-PP inkampani yasemthwakweni ishona ukuthi inqanaba lokuxhuma kwe-MD liyisilinganiso se-20 ku-30 percent elihle kune-HDPE emva kokusukela kwezindlela zokuzithatha. Lokhu kuyenza ngoba i-PP inastructure esishiywa kahle esiqondile kakhulu lapho kufakwa umthelela. Kodwa kuloko kunezinto eziningi ezingenakwenzeka ngaphandle kokunika okunye kwezinye ezizimele kwezinkulungwane. Ngaphezu kwe-zero degrees Celsius, i-PP iqala ukuba yinkani kakhulu futhi iyakwenta ukuba yisilili kumathuba omkhakha wokuvula. Kuhlelwa kwakho i-HDPE. Iyahlala yinhloko yekhanda futhi iyabuza ukuthi ibe yinkani yemiphumela yokuqinisa nangaphansi kwe-minus thirty degrees Celsius. Lokhu kuyenza umehluko wonke wezinto ezenziwa ukusuka kwe-plastic flat film drawing equipment ekufundzeni kwe-freezer. Abashicileli abaningi bafunda ukuthi i-HDPE inqubo yokubuza ukuthi iphambana ngezikhathi zokuhlala kwezinkampani zokuphambana kwezinkinga zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwezinkampani zokuhlala kwe......

Ukuphakanyiswa, Ukuqiniseka Kwemithambo, nokubonakaliswa Kwemibala Emithambeni Emihle

Ukukhulu kwe-density ya-HDPE (ngokugcwele phakathi kwe-0.94 kunye ne-0.97 grams ngamancane we-cubic centimeter) kuthetha ukuthi abasebenzisi bakhwenza izinto ezincinci kune-polypropylene (okuphakathi kwe-0.90 kunye ne-0.91 g/cm³) kodwa bafika ekufaneni kokubaluleka kwesikhundla sokubusa umoya nokuhlanzwa. Lokhu kuthetha ukuthi kusebenza ngokugcwele izinto ezingu-15% ezingaphansi kwezinye zokusebenza esifanayo. Ngakolunye uhlangothi, i-polypropylene ina-phase eyingaphambili eyayenza ukuthi iyabona ngokushesha kakhulu uma isebenzisa ngendlela efanele emsebenzini. Isiphumo? Ukungabonakali kwe-haze kuvula ngaphezu kwe-90% kulokho kwe-HDPE, okwenza i-PP ibe yinkulungwane yokubona ngokushesha kakhulu kumaqondiso apho abasemthwakazi bayadinga ukubona lokhu okusendaweni yokuqasha. Lokhu kubalulekile kakhulu kumaqondiso ayo apho izinto zihlukanisana ngokubona kumaqondiso. Uma kuchazwa ngezinhlobo zezindlela zokusebenza, ikakhulu kumaqondiso amancinci angaphezu kwe-30 microns, i-HDPE iyasho ukuthi inyathelwa ngokukhulu emva kwezimpact noma kwezindlela zokubuka. I-polypropylene ayikho kule ndlela, kuzoba yinkulungwane yokubona ngokushesha kakhulu futhi ayikho imiphumela yezinkinga ngokufanayo.

Ukuqiniseka Kwemilayezo Yomnotho Ngokwezinye Izingxenye Zokusebenza Kwezinsuku Eziningi

Ukuthabatha Kwe-UV, Ukuthandana Nokubambisana Kwemilayezo, Nobukhulu Bomnotho Ngaphandle Kwesikhebe

Isithakazelo sesikhundla semithambo yase-HDPE sibona ukuthi sibiza ngokuzenzakalelayo ukuthabatha kwe-UV, kodwa ngakho-ke kunezilayezo ezincinci kuphela okufanele zifakwe uma kusetyenziswa ngaphandle kwesikhebe. Kodwa i-Polypropylene ayifani nalo. Inezikhundla zemithambo eziyisithathu ezinokungathabathi kahle isibhubheshe, okubhekisela kuthi abasemthengiselayo kufanele bafake izinkokhelo zokuthabatha kwe-UV emphakathi yama-0.3 no-0.8 percent ukuze bafumane imiphumela efana nalo. Uma sibheka amathesiti wokugcina kwezinsuku ozimile ngokulandela izindlela zokuqwalaselwa kwe-ASTM D4329, i-HDPE iba ne-90% yekuthula yobunzima bakho ngaphambi kokuthabatha kwe-UV emva kokuphatha ama-2,000 amahora ngaphansi kwesibhubheshe. Uma akukho ilayezo, i-PP eyisisekelo iyadlala kahle ngaphambi kokuthabatha kwe-UV ngokuphakeme kwe-40%. Abafundi abasebenzisa lezinto ukubeka emafuleni abazi lokhu ubuhlungu ngokwempilo. Amafilimu ase-HDPE ayadlala kusukela ku-5 ku-7 iminyaka ngaphandle kwesikhebe noma kunjalo akukho izinkokhelo ezifanele, kodwa amafilimu ase-PP ayo ayadlala kusukela ku-3 ku-4 iminyaka kabusha ngaphambi kokudlalwa.

Ukuhambana Kwemithambo ne-thermal kwezindlela zokubhekana nendustriya

Kodwa kufundiswa ukuthi lapho kuchazwa ukuthi i-chemical packaging yenzelwe ngokusebenzisa i-plastic flat film drawing equipment, i-HDPE ibonakala kakhulu ngokuthi iyakwamukela amaci, amabase, kanye nezinkampani zezibhalo eziningi. Amathesithi abonisa ukuthi emva kokubheka kusuka kusuka ku-30 izinsuku kumayeli apho ipH ayisiphakathi se-3 kuya ku-12, i-HDPE isula kuphela umbili wama-5% wezindawo zakho. Ngakolunye uhlangothi, i-polypropylene (PP) iyasebenza kahle kakhulu ngokuthi iyadlula ukuthi yizwelela ukuthi isebenza kahle ngokuphelele kuzintemperatsha ezingaphezu kwe-120 degrees Celsius kungakhohlwa i-HDPE eyisiphephelo se-100 degrees. Kodwa qhathanani ngezinkampani zezibhalo ezenziwe ngokusebenzisa i-chlorine nge-PP, ziyakuyikhipha kahle ngokuphelele kusasa. Kusukela ekuboneni kwe-barrier protection, i-HDPE yasebenza kahle kune-PP, ibeka uphansi kwesiphambano sekhemikhali ngokugcina okuphezu kwe-18% ngoba akakwazi ukuvula ukuthi izinto zingene ngendlela efanele. Izinkampani zombili zidinga izinkqubo zokuhlinza ukuthi zizimele kusukela kwenziwa kwe-extrusion process kuzintemperatsha ezingaphezu kwezinkulu ukuze zivikeleke kusukela kwe-oxidation. Lokhu kubalulekile kakhulu lapho kusebenziswa ukuproducwa kuzintemperatsha ezingaphezu kwezinkulu apho izinto ziyasukela kufana kahle uma akakwenzekile kahle.

Ukubhalwa Kwesicelo: Ukufanana ne-PP noma i-HDPE Nokuthi Ukuhambisana Kwesifilm Esilungile Ukuphumelela

Ukukhetha phakathi kwe-polypropylene (PP) ne-high density polyethylene (HDPE) kuyaphela ukuthi yini okubalulekile kakhulu kuliproduct lokugcina, akukho kuphela ukuthi kufanele kube yini okunamandla kakhulu ukuprosesa. Kumaqondiso okudinga ukubona ngokucacile, ukubheka kahle, ukwazi ukuzimela isikhathi sokunyuka kwesikhathi, nokuhlala kahle noma kusekhanyayo, i-PP yilomkhosi owodwa. Iimpaki zemithombo yesayensi, izinkothama ezinamazibuko okunyuka, nezinkothama zokuthengisa eziphambili zonke ziyabenefitela ngokunyuka kwesikhathi kwe-PP esiphakathi kwe-160 ne-170 degrees Celsius, okuhlinza izinto kusukela emaphrojekthini amakhulu ekwenzeni kwemifanekiso. Ngaphakathi kwalokho, i-HDPE iyadlala indima yokuqonda ngokwakhe ukublocka amanzi, ukuzimela ukutshisa, nokuhlala kahle noma kusekhanyayo. Lokhu kwenza i-HDPE ibe yilomkhosi owodwa kumaqondiso njengezinkinga zezinkothama, izinkinga zemfuyo, nezinkinga zokuthengisa ezinkulu ezithandwa ngabantu bonke. Nge-0.94 ku-0.96 grams per cubic centimeter density, i-HDPE inika abasebenzi ukuthola izinkinga ezincinci kodwa bafumana iziphumo ezinhle. Ngakho-ke uma ukubona ngokucacile nokuphatha isikhathi sokunyuka kuyizinto ezingaba yizinyathelo ezibalulekile, khetha i-PP. Kodwa uma umsebenzi udinga ubukhulu bokuzimela ukuzimela kwezinhlobo zokuzimela, izimo zokulwa kwezulu, nokuzimela izinto ezikhiywe kumaqondiso okungasendaweni yokuhlanganisa, i-HDPE iyisikhathi esihle kakhulu kumaqondiso onke okwesikhathi sokusebenza.

Imibuzo Evame Ukubuzwa

Izinhlobo zezinkinga zokuphakama kwezinkampani zokuphakama kwe-PP ne-HDPE ziyiphi?

I-Polypropylene (PP) inehlamvu eliphakeme kakhulu, kufuneka kubekwe imvutho enkulu ukuze iproseshe, ngakho-ke i-HDPE iyaphakama emaphakameni amancane kodwa iyavumela ukuprodukha kusheshile ngokwesibonelo sokufula kumadiezi.

Kungani i-HDPE iyadala izikrithali kusheshile kungeza kwe-PP ngokuhlanya?

I-HDPE iyadala izikrithali ngokusheshile ngo-30% kungeza kwe-PP ngokwesibonelo sekhethe isikhathi sakho sokuqhubeka, okusiza ekufinyezeni izihlukahlukana zokudala.

Ukulinganisa kwe-PP ne-HDPE kungani ngokwesibonelo sokubona kwe-UV?

I-HDPE inqoba ngokuzenzakalelayo i-radiation yomoya we-UV ngokwesibonelo sekhethe isibonelo sakho sesihlukahlukana, ngakho-ke i-PP ifuna i-inhibitors zomoya we-UV ukuze ibonelele ukusebenza kwezindawo zomoya.

Yini okwenza i-PP ibe yinkampani eyodwa kakhulu yezifilm ezilungile?

Isibonelo sakho sesihlukahlukana se-PP sisiza ekuboneni kakhulu, kunciphisa indlela yokubona kakhulu futhi kwenza kuyinto eyodwa kakhulu kuzinca zokubona.

Ukulinganisa kwezinkampani zokuchitha nezinkampani zokuphakama kwe-PP ne-HDPE kungani?

I-HDPE iyasebenza ngokuhle kakhulu ekubhekiseni izinkimika, ikakhulu amasi nezinkulungwane, nakuba i-PP iyabuza ubukhulu beziphephiso emakhosini aphezulu kodwa iyapholakala kumazinyo e-chlorine.