Okulandelayo yizimiso ezibalulekile okufanele uzikhumbule mayelana ne-extrusion.Kufanele basize ukonga imali, bakhiqize imikhiqizo yekhwalithi ephezulu, futhi basebenzise izinto zokusebenza ngokuphumelelayo.
7. Izindleko zikagesi azibaluleki kangako.
Naphezu kokuthakasela okudumile kanye nezinkinga zangempela ezingeni lesitshalo ngezindleko zamandla ezikhuphukayo, amandla adingekayo ukuze kuqhutshwe i-extruder aseyinxenye encane kakhulu yezindleko zokukhiqiza eziphelele.Lokhu kuzohlala kunjalo ngoba izindleko zempahla ziphezulu kakhulu, i-extruder iyisistimu ephumelelayo, futhi uma amandla engeziwe ethulwa ipulasitiki izoshisa kakhulu ukuthi ingacutshungulwa kahle.
8. Ukucindezela ithiphu lesikulufa kubalulekile.
Le ngcindezi ibonisa ukumelana nayo yonke into engezansi kwesikulufu: izikrini nokungcoliswa, i-breaker plate, i-adaptha, amashubhu okudlulisa, izixube ezimile (uma zisetshenziswa), kanye ne-die uqobo.Akuxhomekile kuphela ku-geometry yalezi zingxenye, kodwa futhi namazinga okushisa ohlelweni, okubuye kuthinte i-resin viscosity kanye nezinga lokuphuma.Ayincikile ekwakhiweni kwesikulufa, ngaphandle kokuthi ithinta izinga lokushisa, i-viscosity, kanye nokuphumayo.
Ukulinganisa ingcindezi kubalulekile ngenxa yezizathu zokuphepha—uma iphakama kakhulu, ikhanda nokufa kungase kuqhume futhi kulimaze noma kulimaze abantu noma imishini eseduze.
Ingcindezi ilungile ekuxubeni, ikakhulukazi endaweni yokugcina (yemitha) kuma-single-screw systems.Kodwa-ke, ukucindezela okuphezulu kusho ukuthi amandla engeziwe athathwa ngenjini—ngaleyo ndlela izinga lokushisa liphezulu lokuncibilika—okungase kunqume umkhawulo wengcindezi.Kuzikulufu ezingamawele, ukuhlangana kwezikulufu ezimbili kuyi-mixer esebenza kahle, ngakho ingcindezi ayidingeki ngale njongo.
Ekwenzeni izinto ezingenalutho, njengepayipi elinesicabucabu esisebenzisa izingalo ukubamba inkaba emaphakathi endaweni, ukucindezela okuphezulu kufanele kukhiqizwe efasiteleni ukuze kusizwe imifudlana ehlukene ihlangane futhi.Uma kungenjalo, umkhiqizo ungase ube buthaka kule migqa yokushisela futhi ungase wehluleke ekusebenzeni.
9. Okukhiphayo = ukususwa kwendiza yokugcina, +/ – ukugeleza kwengcindezi nokuvuza.
Ukususwa kwendiza yokugcina kubizwa ngokuthi ukugeleza kokuhudula, futhi kuncike kuphela ku-screw geometry, isivinini sesikulufu, nokuminyana kokuncibilika.Ilungiswa ukugeleza kwengcindezi, okuhlanganisa ngempela umphumela wokumelana (okuboniswa ukucindezela kwekhanda) ukunciphisa okukhiphayo, kanye nomphumela wanoma yikuphi ukubinda okuphakelayo ukwandisa okukhiphayo.Ukuvuza phezu kwezindiza kungase futhi kube nhlangothi zombili.
Kuyasiza futhi ukubala okukhiphayo nge-rpm ngayinye, njengoba lokhu kukhombisa noma yikuphi ukuwohloka kwamandla okumpompa isikulufu ngesikhathi.Esinye isibalo esihlobene ukukhishwa kwe-hp ngayinye noma i-kW yamandla asetshenzisiwe.Lokhu ukusebenza kahle futhi kwenza ukulinganiswa kwamandla okukhiqiza emoto kanye nokushayela okunikeziwe.
10. Izinga le-Shear lidlala indima ebalulekile ku-viscosity.
Wonke amapulasitiki avamile a-shear -thinning, okusho ukuthi i-viscosity iba phansi njengoba ipulasitiki ihamba ngokushesha futhi ngokushesha.Amanye amapulasitiki akhombisa lo mphumela ngendlela emangalisayo.Amanye ama-PVC, ngokwesibonelo, ageleza izikhathi eziyi-10 noma ngaphezulu ngokushesha ngokuphinda kabili kokuphusha.I-LLDPE, ngokuphambene, ayigundi -zacile kakhulu, futhi ukuphinda kabili kwamandla okuphushayo kukhulisa ukugeleza kwayo izikhathi ezintathu kuya kwezine kuphela.Umphumela oncishisiwe we-shear -thinning usho i-viscosity ephakeme ezimweni ze-extrusion, okusho ukuthi amandla emoto amaningi ayadingeka.Lokhu kuchaza ukuthi kungani i-LLDPE ishisa kakhulu kune-LDPE.
Ukugeleza kuvezwa ngokwesilinganiso sokugunda, okungamasekhondi ayi-100 -1 eziteshini zesikulufu, phakathi kuka-100 no-1000 sec-1 ezindebeni eziningi zokufa, futhi ngaphezu kwesekhondi elingu-1000 -1 ekususweni kwendiza kuya odongeni nokunye. izikhala ezincane zokufa.Inkomba ye-Melt iyisilinganiso esivamile se-viscosity kodwa ihlanekezelwe (okungukuthi, ukugeleza/phusha esikhundleni sokusunduza/ukugeleza).Ngeshwa, kukalwa ngezilinganiso zokugunda okungu-10 sec -1 noma ngaphansi futhi kungase kungabi isilinganiso sangempela ku-extruder lapho ukuncibilika kugeleza ngokushesha okukhulu.
11. I-motor iphikisana ne-barrel, i-barrel iphikisana ne-motor.
Ngaqala ngezimiso ezibalulekile ze-10 ze-extrusion, kodwa lena yayibaluleke kakhulu kangangokuthi kwadingeka ngiyifake, futhi.Umthetho Weshumi nanye yingakho ukulawulwa kwemiphongolo kungaphumeleli ngaso sonke isikhathi ngendlela ofisa ngayo noma kulindelekile, ikakhulukazi endaweni yokulinganisa.Uma umgqomo ushisiwe, ungqimba lwempahla odongeni lomgqomo luba lubi kakhulu futhi injini idinga amandla amancane ukuze ivule lo mgqomo ogcotshwe kakhulu.I-Motor current (amps) iyehla.Ngakolunye uhlangothi, uma umgqomo upholile, ukuncibilika odongeni lomgqomo kuba yi-viscous, injini kufanele isebenze kanzima, ama-amps akhuphuke, futhi okunye ukushisa okukhishwe emgqonyeni kubuyiselwa emuva yi-motor.Ngokuvamile, izilawuli zemiphongolo ziba nomthelela ekuncibilikeni okufunayo, kodwa akukho ndawo njengenani lokushintsha indawo.Kungcono ukulinganisa izinga lokushisa lokuncibilika ukuze uqonde ngempela ukuthi kwenzekani.
Isikhathi sokuthumela: May-27-2017