PET (Polyethylene terephthalate)
Kuomesa uye Crystallizing pamberi Injection molding processing
Inofanira kuomeswa isati yaumbwa.PET inonzwa zvakanyanya kune hydrolysis.Iyo yakajairwa mhepo yekudziya-inoomesa i120-165 C (248-329 F) kwe4 maawa.Hunyoro hunofanirwa kunge huri pasi pe0.02%.
Adopt ODEMADE IRD system, nguva yekuomesa inongoda 15mins.Chengetedza mutengo wesimba nezve 45-50%.Hunyoro hwemukati hunogona kuita 50-70ppm.(Iyo tembiricha yekuomesa, nguva yekuomesa inogona kuchinjika nezvinodiwa nevatengi pakuomeswa kwezvinhu, iyo system yese inodzorwa neSiemens PLC).Uye ndiko kugadzirisa neKuomesa & Crystallizing panguva.
Melt tembiricha
265-280 C (509-536 F) yemakiredhi asina kuzadzwa
275-290 C (527-554 F) yegiredhi rekusimbisa girazi
Mold tembiricha
80-120 C (176-248 F);Inosarudzika: 100-110 C (212-230 F)
Material jekiseni pressure
30-130 MPa
Jekiseni kumhanya
High speed pasina kukonzera embrittlement
Jekiseni molding muchina:
Jekiseni molding inonyanya kushandiswa kusimudzira kuumbwa kwePET.Kazhinji, PET inogona kungogadzirwa nemuchina wekuumba jekiseni.
Zvakanakisisa kusarudza mutant sikuruu ine reverse ring pamusoro, iyo ine yakakura kuoma kwepamusoro uye kusapfeka, uye chikamu chechiyero hachisi L / D = (15 ~ 20): 1 compression reshiyo ye3: 1.
Zvishandiso zvine hombe L / D zvinogara mudhiramu kwenguva yakareba, uye kupisa kwakanyanya kunogona kukonzera kuderedzwa uye kukanganisa kuita kwechigadzirwa.The compression reshiyo idiki zvakanyanya kugadzira kupisa kushoma, iri nyore kuisa plastiki, uye ine kusashanda zvakanaka.Kune rumwe rutivi, kuputsika kwegirazi fibers kuchave kwakawanda uye mechanical properties ye fiber ichaderedzwa.Kana iyo girazi fiber yakasimbiswa PET inosimbiswa, madziro emukati ebhodhoro anosakara zvakanyanya, uye mbiya inogadzirwa neyakapfeka inodzivirira zvinhu kana yakarongedzerwa nekupfeka kusagadzika zvinhu.
Sezvo muromo uri mupfupi, madziro emukati anoda kuve pasi uye aperture inofanira kunge yakakura sezvinobvira.Iyo muromo weiyo hydraulic brake valve mhando yakanaka.Manozzles anofanirwa kuve neinsulation uye tembiricha yekudzora matanho kuti ive nechokwadi chekuti mhuno hadziite chando nekuvharika.Nekudaro, iyo tembiricha yemhino haifanirwe kunge yakanyanya kukwirira, kana zvisina kudaro inokonzeresa runny.Low pressure PP zvinhu zvinofanirwa kushandiswa uye mbiya inocheneswa isati yatanga kuumba.
Iwo majekiseni makuru ekuumba mamiriro ePET
1, kupisa kwebhodhoro.Iyo yekuumba tembiricha yePET yakamanikana, uye tembiricha inokanganisa zvakananga kuita kwechigadzirwa.Kana tembiricha yakadzikira, hazvina kunaka kuisa mapurasitiki epurasitiki, dents, uye kushaikwa kwehurema hwezvinhu;pane zvinopesana, kana kutonhora kwakanyanyisa, kunokonzera kuputika, mazamu achayerera, ruvara ruchave rwakasviba, simba remagetsi richaderera, uye kunyange kuora kuchaitika.Kazhinji, tembiricha yebhari inodzorwa pa 240 kusvika 280 ° C, uye girazi fiber yakasimbisa PET mbiya tembiricha iri 250 kusvika 290 ° C. Kupisa kwemvura hakufaniri kudarika 300 ° C, uye tembiricha yemhino kazhinji yakaderera. kupfuura kupisa kwembiya.
2, tembiricha yekuumbwa.Iyo tembiricha yekuumbwa inokanganisa zvakananga kutonhora kweyero uye crystallinity yekunyungudika, iyo crystallinity yakasiyana, uye zvimiro zvezvikamu zvepurasitiki zvakasiyana.Kazhinji, tembiricha yekuumbwa inodzorwa pa100 kusvika 140 °C.Zvidiki zvakakosha zvinokurudzirwa kana uchigadzira zvikamu zvepurasitiki zvakatetepa.Paunenge uchigadzira zvikamu zvepurasitiki zvakakora, zvinokurudzirwa kuve nekukosha kukuru.
3. Jekiseni pressure.Iyo PET inonyungudika inoyerera uye iri nyore kugadzira.Kazhinji, kudzvanywa kwepakati kunoshandiswa, kudzvanywa kuri 80 kusvika 140 MPa, uye girazi fiber-yakasimbiswa PET ine jekiseni rinomanikidza re90 kusvika 150 MPa.Kudzvanywa kwejekiseni kunofanirwa kutariswa nekutarisa viscosity yePET, rudzi uye huwandu hwekuzadza, nzvimbo uye saizi yegedhi, chimiro uye saizi yechikamu chepurasitiki, tembiricha yekuumbwa, uye mhando yemuchina wekuumba jekiseni. .
Zvakawanda sei zvaunoziva nezve kugadzirwa kwePET plastiki?
1, kugadzirwa kwepurasitiki
Sezvo PET macromolecules ine lipid base uye ine imwe hydrophilicity, zvimedu zvinonzwa kumvura pakupisa kwakanyanya.Kana hunyoro hwemukati huchipfuura muganhu, huremu hwemamolekyulu ePET hunodzikira, uye chigadzirwa chine ruvara uye chinova brittle.Muchiitiko ichi, zvinhu zvinofanira kuomeswa zvisati zvagadziriswa.Kuomesa tembiricha iri 150 4 maawa, kazhinji 170 3 kusvika 4 maawa.Iyo nzira yejeti yemhepo inoshandiswa kuyedza kana zvinhu zvacho zvakaoma.
2. Kusarudzwa kwejekiseni molding machine
PET ine nzvimbo pfupi yekunyunguduka uye yakakwira kunyungudika, saka zvinodikanwa kusarudza jekiseni system ine yakakura tembiricha yekudzora huwandu uye kushoma kuzvipisa panguva yepurasitiki, uye huremu chaihwo hwechigadzirwa hahugone kuve pasi pe2/3 ye uremu hwayo.Huwandu hwejekiseni yemuchina.Zvichienderana nezvinodiwa izvi, mumakore achangopfuura, Ramada yakagadzira nhevedzano yediki uye yepakati-saizi PET yakakosha plasticizing masisitimu.Iyo yakasarudzwa clamping simba yakakura kupfuura 6300t / m2.
3. Mold uye gedhi kugadzira
PET preforms anowanzo kuumbwa nekupisa mumhanyi mold.Iyo inopisa nhovo pakati pe mold uye jekiseni molding muchina zviri nani insulated nehupamhi hwemamirimita gumi nemaviri, uye nhovo yekupisa inogona kumira kumanikidza kwakanyanya.Chiteshi chekuburitsa chinofanira kunge chakakwana kudzivirira kupisa kwenzvimbo kana kuputika, asi kudzika kwechiteshi chekuburitsa kazhinji hakupfuure 0.03 mm, zvikasadaro kupenya kuri nyore.
4. Kunyunguduka kwekushisa
Kuyera kunogona kuitwa nemhepo jet nzira.Pa270-295 ° C, mwero wekusimudzira weGF-PET unogona kusetwa ku290-315 ° C.
5. Kumhanya kwejekiseni
Iyo general jekiseni kumhanya inokurumidza, izvo zvinodzivirira kukurumidza kurapwa kwejekiseni.Asi nekukasira, kugera kwakakwira kunoita kuti zvinhu zvipere.Iyo popup inowanzopedzwa mumasekonzi mana.
6, back pressure
Iyo yakaderera iri nani, kuitira kuti usapfeke.Kazhinji hapana kupfuura 100bar.
Nguva yekutumira: Feb-24-2022