Kunzwisiswa kwetsananguro dzemuviri dzinopihwa muchitsauko chino chete kunogona kuratidza kubatsira zvakakwana kuvaverengi vazhinji, uye kuvabatsira kuvandudza maitiro avo uye zvigadzirwa.Iyo polymer extruder inoshandiswa kunyungudutsa yakasimba polymer uye kuendesa iyo yakanyungudutswa polymer kune akasiyana ekugadzira kana maumbirwo maitiro.Iyo screw ndiyo chete inoshanda chikamu che extruder.Zvimwe zvinhu zvese (motor, gear-box, hopper, barrel and die, etc.) zvinongopa rutsigiro rwakakodzera kuti screw ishande nemazvo.Iwo ese mabasa eextruder anoratidzwa pazasi.
Basa rekudyisa rekutamisa polima yekudyisa kubva kuhopper kuenda kuscrew channel inoitika kunze kwescuru, uye hazvinei nedhizaini.Iyo screw inoita mabasa matatu akakosha: (1) solid conveying function, (2) kunyungudika basa, uye (3) metering basa kana kupomba basa.Iwo matatu screw function anoitika panguva imwe chete pamusoro peakawanda escrew urefu uye anoenderana zvakanyanya.Zita rejeometri resikurwa chikamu sechikamu chekudyisa, chinoratidzwa muChitsauko 1;Fig. 1.3, hazvireve hazvo kuti ibasa chete rechikamu chescrew.Semuenzaniso, chikamu chekudyisa hachiite chete chakasimba chekufambisa basa, asiwo kunyunguduka uye metering mabasa.Iyo screw inoitawo mamwe mabasa echipiri akadai sekugovera kusanganisa, dispersive mix, uye shear kunatsa kana homogenization.Distributive mixing inoreva spacial rearrangement yezvikamu zvakasiyana, uye dispersive mixing inoreva kuderedzwa kwezvikamu zvehukuru sezvinotsanangurwa muChitsauko 2;Chikamu 2.6.4.Kuchenura kunoreva homogenization yepolymer mamorekuru nekuveura.Imwe-screw extruder inoramba iine volumetric pombi isina kumashure-kusanganisa kugona uye isina kunaka kuburitsa kugona.Chii chinopinda muscuru kutanga, chinobuda muscuru kutanga.Polima, seyakasimba kana kunyunguduka, inodzika pasi pescrew chiteshi nemasimba anoiswa papolymer nekona inotenderera uye dhiramu rakamira.Iko hakuna maitiro ekufambisa zvakanaka polima padivi pe screw channel yakananga kufa.Iyo screw inotenderera inobata iyo polima uye inoedza kutenderedza iyo polymer nayo.Ngatitii dhiramu rinobviswa kubva kune extruder, kana kunyatsozorwa, zvekuti haipe kupesana nekufamba kwepolymer.Ipapo iyo polymer inongotenderera nescrew nekumhanya kwakafanana uye hapana chinobuda muscuru.Iyo dhiramu yakamira inopa simba rekupwanya kune inotenderera polima uye inoita kuti iyo polima itsvedze zvishoma pane screw surface.Iyo polima ichiri kutenderera ne screw ichikwesha pamusoro pembiru, asi nekumhanya kwakadzikira pane screw, nekuda kwekutsvedza.Kutsvedza kwepolymer pane screw surface padivi pescrew channel inoguma nechiyero chekubuda.Iyo yerubricated screw surface inowedzera chiyero chekubuda, asi yakazorwa mbiya pamusoro inoderedza kuburitsa mwero.Zvinonzwisisika kuti nei zvigadziriso zvekutengesa zvakanyanya kukwenenzverwa, uye nei grooved mbiya muchikamu chekudyisa ichisarudzwa.Kunyange zvazvo maitiro akawanda ezvokutengeserana akagadzirwa empirically pane kubva pakuongorora kwezvinyorwa, zvechokwadi vanobvumirana nemafungiro ezvinyorwa zvepfungwa.Matanho ari mukati meimwe-screw extruder anodzidzwa nekuongorora iyo polymer cross-sections padivi pe screw channel inotorwa kubva "screw-freezing experiments".Muchiyedzo chekuomesa-chando chakapayona naMaddock [1], sikururu inomhanya kuti iite kushanda kwakadzikama.Zvadaro, screw inomiswa uye kutonhora kwemvura kunoiswa padhiramu (uyewo pascrew kana zvichibvira) kuomesa polima mukati meiyo screw channel.Iyo dhiramu inopisa zvakare kunyungudutsa iyo polima, uye screw inosundirwa kunze kwedhiramu apo polima inotanga kunyungudika pamusoro pedhiramu.Zvadaro, tambo yakaomeswa yepolymer inobviswa kubva kuscrew chiteshi uye inochekwa munzvimbo dzakawanda kuti uongorore michinjiro-zvikamu padivi pe screw chiteshi.Mamwe mapellet ane mavara akavhenganiswa mukudya kuti aone kunyunguduka uye maitiro ekuyerera.Mapellet ane mavara anochengeta zvimiro zvawo kana akaramba akasimba mukati memubhedha wakasimba sikuru isati yamira, asi aicheka uye kuita mitsetse mukati memvura yakanyauka kana akanyungudutswa sikuruu isati yamira.
Nguva yekutumira: Jun-16-2019