Plastics extrusion inzira yekugadzira yakakwira-vhoriyamu umo mapurasitiki akasvibira anonyungudutswa uye anoumbwa kuita chimiro chinoenderera.Extrusion inogadzira zvinhu zvakaita sepombi/tubing, weatherstripping, fencing, deck railings, mawindow mafuremu, epurasitiki mafirimu uye sheeting, thermoplastic coatings, uye wire insulation.
Screw Design:
Iyo dhizaini ye screw yakakosha pakugadzirwa kwepurasitiki.Inonyanya kuita mabasa matatu akasiyana: kureva, nzira yekudyisa;yunifomu kunyunguduka uye kusanganiswa kwepurasitiki uye pakupedzisira inoburitsa kumanikidza kusunda zvinhu zvakanyungudutswa kuburikidza nekufa.Kureba sikururu (L) kunongedzerwa kudhayamita yaro (D) sereshiyo yeL/D.Kazhinji, chiyero cheL/D chinoshandiswa se 24:1, asi pakuwedzera kusanganisa uye kubuda, inogona kuwedzera kusvika pa32:1.Pane nzvimbo nhatu dzinokwanisika mukureba uku kureva nzvimbo yekudya, nzvimbo yekunyunguduka, uye nzvimbo yemita.(a) Nzvimbo yekudya: Munzvimbo iyi, resin inoiswa kubva pahopper mudhiramu, uye kudzika kwechanera kunoramba kuripo.(b) Melting zone: Iyo yepurasitiki zvinhu zvinonyungudutswa uye kudzika kwechiteshi kunowedzera kudiki zvishoma.Inodaidzwa zvakare kunzi transition kana compression zone.(c) Metering zone: Purasitiki yakanyungudutswa inosanganiswa patembiricha yakafanana uye kudzvanywa uye kutumirwa kuburikidza nedhizi.Kudzika kwechiteshi kunongogara munzvimbo yese iyi.
Mhando dzeExtrusion Process
Iyo extrusion process inokamurwa mumhando nomwe dzakasiyana zvichienderana nemashandisirwo chaiwo.(a)Sheet/Firimu ExtrusionMune iyi extrusion process, iyo yakanyungudutswa yepurasitiki zvinhu inoburitswa kuburikidza neyakafafa kufa.Mipumburu yekutonhodza inoshandiswa kuona ukobvu hweshizha/firimu uye magadzirirwo aro.Ukobvu hwepepa hunogona kuwanikwa muhupamhi hwe 0.2 kusvika 15 mm.Pepa rakatetepa rakatsetseka kana firimu rezvinhu zvepurasitiki zvinogona kugadzirwa.Kazhinji, polystyrene plastiki inoshandiswa seyakagadzirwa mushezha extrusion process.(b)Yakaputika Firimu ExtrusionMukuita firimu rinoputika, iyo inofa yakafanana necylinder yakatwasuka ine denderedzwa profile.Plastiki yakanyungudutswa inodhonzwa kumusoro kubva padhiri nepeya yenip rollers.Mhepo yakamanikidzwa inoshandiswa kufuridzira chubhu.Kutenderedza dhiri, mhepo-inoiswa mhete.Chinangwa chemhepo-mhete ndechekutonhodza firimu parinofamba richikwira kumusoro.Pakati pekufa, pane mhepo inopinza kubva iyo yakamanikidzwa mhepo inogona kumanikidzwa kupinda pakati peiyo denderedzwa chimiro, uye kugadzira bubble.Iyo extruded denderedzwa yemuchinjikwa chikamu inogona kuwedzerwa 2-3 nguva dzefa dhayamita.Mabhubhu anoputsika nerubatsiro rwendiro inodonha.Iyo nip rolls inopepeta bubble kuita kaviri layer yefirimu inodaidzwa kuti layflat.Ukobvu hwemadziro emufirimu hunogona kudzorwa nekushandura kukurumidza kwe nip rollers.Iyo layflat inogona kusvibiswa nenzira yepumburu kana kuchekwa kuita maumbirwo anodiwa.Rutivi rwepasi pe layflat rwakanamwa nekushandiswa kwekupisa, uye cheka kuyambuka kumusoro kusvika kuvhurika;saka inogona kushandiswa kugadzira bhegi repurasitiki.Iyo dhayamita yekufa inogona kusiyana kubva pa 1 kusvika ku 300 centimita. Kazhinji, polyurethane plastiki inoshandiswa mune iyi nzira.
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(c)Pamusoro peJacketing Extrusion
Izvi zvinonziwo wire coating process.Mukuita uku, waya isina chinhu inodhonzwa nepakati pedhishi.Kune marudzi maviri akasiyana eextrusion tooling anoshandiswa kupfekedza pamusoro pewaya iepressure kana jacketing tooling.Kana kushamwaridzana kwepedyo kana kunamatira kunodiwa pakati pewaya uye kupfeka, kushandiswa kwekushandisa kunoshandiswa.Kana kunamatira kusingadiwi, jekete tooling inoshandiswa.Nekudzvanyirira midziyo, waya inodzoserwa mukati mekufa, uko inosangana nepurasitiki yakanyungudutswa pakumanikidza kwakanyanya.Zvekushandisa jekete, waya inotambanuka uye plastiki yakanyungudutswa ichaita chivharo pawaya mushure mekufa.Waya yakashama inodyiswa kuburikidza nedhifi uye haisangani yakananga nepurasitiki yakanyungudutswa kusvika yasiya mufi.Musiyano mukuru pakati pejaketi uye kumanikidza midziyo ndiyo nzvimbo yewaya nekuremekedza kufa.
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(d)Tubing ExtrusionMukuita uku, purasitiki yakanyungudutswa inoburitswa kuburikidza nekufa uye maburi emuchinjiko zvikamu zvinoumbwa nekuisa mandrel mukati mekufa.Tube ine maburi akawanda inogonawo kugadzirwa kune chaiwo maapplication, nekuisa akati wandei mandrels pakati pekufa.(e)CoextrusionCoextrusion ndiyo extrusion maitiro ekugadzira akawanda akaturikidzana ezvinhu panguva imwe chete.Inoshandiswa kuisa imwe kana mamwe mitsara pamusoro pezvigadziko kuti uwane chaiwo zvivakwa senge ultraviolet absorption, grip, matte pamusoro, uye simba rekuratidzira, nepo base zvinhu zvakanyanya kukodzera kune mamwe maapplication, semuenzaniso kupikisa uye kuita kwemaitiro.Inogona kushandiswa pane chero maitiro akadai seyakavhuvhuta firimu, overjacketing, tubing, sheet / firimu extrusion.Mukuita uku, maviri kana anopfuura maextruder anoshandiswa kuendesa zvinhu izvo zvinosanganiswa kuita imwechete inofa iyo inoburitsa zvinhu muchimiro chaunoda.Ukobvu hwehuputi hunodzorwa nekumhanya uye saizi yemunhu anoburitsa zvinhu.(f)Extrusion CoatingExtrusion coating inoshandiswa kugadzira imwe layer pane iripo rollstock yepepa, foil kana firimu.Semuenzaniso, kuvandudza mvura inodzivirira yepepa polyethylene coating inoshandiswa.Iko kushandiswa kweextrusion coating kurongedza kwemvura, mapepa emifananidzo, mahamvuropu, masaga anonamira efotereza kurongedza uye kurongedza kwekurapa.Kazhinji, polyethylene uye polypropylene inoshandiswa.
Nguva yekutumira: Oct-01-2018