Ingabe Uyazi Lezi Zixwayiso Ze-PET Preforms?

I-PET Preforms

Ngaphansi kokushisa okuthile nokucindezela, isikhunta sigcwele izinto zokusetshenziswa, futhi ngaphansi kokucutshungulwa komshini wokubumba umjovo, sicutshungulwa sibe yi-preform enobukhulu obuthile nokuphakama okuhambisana nesikhunta. I-PET preforms icutshungulwa kabusha ngokubunjwa kokushaywa ukuze yenze amabhodlela epulasitiki, okuhlanganisa amabhodlela asetshenziselwa izimonyo, imithi, ukunakekelwa kwezempilo, iziphuzo, amanzi amaminerali, ama-reagents, njll Indlela yokwenza amabhodlela epulasitiki e-PET ngokusebenzisa ukubunjwa kokushaywa.

1. Izici ze-PET Raw Materials
Ukungafihli kuphezulu njengokungaphezu kuka-90%, isicwebezelisi esingaphezulu kuhle kakhulu, futhi ukubukeka kuyingilazi; ukugcinwa kwephunga kuhle kakhulu, ukucinana komoya kuhle; ukumelana kwamakhemikhali kuhle kakhulu, futhi cishe yonke imithi ephilayo imelana nama-asidi; impahla ehlanzekile yinhle; ngeke kushise Igesi enobuthi ikhiqizwa; izici zamandla zinhle kakhulu, futhi izici ezahlukahlukene zingathuthukiswa ngokwengeziwe ngokunwebeka kwe-biaxial.

2. Umswakama Owomile
Ngenxa yokuthi i-PET inezinga elithile lokumuncwa kwamanzi, izomunca amanzi amaningi ngesikhathi sokuthutha, ukugcinwa nokusetshenziswa. Izinga eliphezulu lomswakama lizokhula ngesikhathi sokukhiqiza:

- Ukwanda kwe-AA (Acetaldehyde) i-acetaldehyde.

Umthelela oyiphunga emabhodleleni, okuholela ekunambithekeni (kodwa umthelela omncane kubantu)

- IV (IntrinsicViscosity) ukwehla kwe-viscosity.

Kuthinta ukumelana nokucindezela kwebhodlela futhi kulula ukuphuka. (Ingqikithi ibangelwa ukuwohloka kwe-hydrolytic ye-PET)

Ngesikhathi esifanayo, yenza amalungiselelo okushisa aphezulu e-PET engena emshinini wokubumba umjovo we-shear plasticization.

3. Ukomisa Izidingo
Ukushisa kwesethi yokumisa 165℃-175℃

Isikhathi sokuhlala amahora angama-4-6

Izinga lokushisa lechweba lokuphakela lingaphezu kuka-160°C

Indawo yamazolo ngaphansi -30℃

Ukugeleza komoya owomile 3.7m⊃3; /h ngekg/h

4. Ukoma
Umswakama ofanelekile ngemva kokomiswa cishe: 0.001-0.004%

Ukoma ngokweqile kungase kubhebhethekise:

- Ukwanda kwe-AA (Acetaldehyde) i-acetaldehyde

-IV (IntrinsicViscosity) ukwehla kwe-viscosity

(Ngokuyisisekelo kubangelwa ukuwohloka kwe-oxidative kwe-PET)

5. Izinto Eziyisishiyagalombili Ekubumbeni Umjovo
1). Ukulahlwa kwePlastiki

Njengoba ama-macromolecule e-PET aqukethe amaqembu e-lipid futhi anezinga elithile le-hydrophilicity, ama-pellets azwela emanzini emazingeni okushisa aphezulu. Lapho umswakamo udlula umkhawulo, isisindo samangqamuzana e-PET siyehla ngesikhathi sokucutshungulwa, futhi umkhiqizo uba nemibala futhi ube brittle.
Ngakho-ke, ngaphambi kokucubungula, izinto kufanele zomiswe, futhi izinga lokushisa lokumisa liyi-150 ° C amahora angaphezu kwama-4; ngokuvamile 170 ° C amahora 3-4. Ukoma okuphelele kwezinto kungabhekwa ngendlela yokudubula emoyeni. Ngokuvamile, ingxenye yezinto ezigaywe kabusha ze-PET preform akufanele idlule u-25%, futhi izinto ezigaywe kabusha kufanele zomiswe kahle.

2). Ukukhetha Umshini Wokubumba Umjovo

Ngenxa yesikhathi esifushane esizinzile se-PET ngemuva kwephuzu lokuncibilika kanye nendawo ephezulu yokuncibilika, kuyadingeka ukukhetha uhlelo lomjovo olunezingxenye zokulawula izinga lokushisa ezithe xaxa kanye nokukhiqizwa kokushisa okuzibambayo okuncane ngesikhathi sokwenziwa kwepulasitiki, kanye nesisindo sangempela somkhiqizo (amanzi). -containing material) akufanele ibe ngaphansi komjovo womshini. 2/3 yenani.

3). Isikhunta kanye neSango Design

Ama-PET preforms ngokuvamile akhiwa isikhunta esigijima esishisayo. Kungcono ukuba nesivikelo sokushisa phakathi kwesikhunta kanye nesifanekiso somshini wokubumba umjovo. Ukuqina kwesihlangu sokushisa cishe ku-12mm, futhi isihlangu sokushisa kufanele sikwazi ukumelana nokucindezela okukhulu. I-exhaust kufanele yanele ukugwema ukushisa ngokweqile noma ukuhlukana kwendawo, kodwa ukujula kwembobo yokukhipha umoya akufanele kudlule u-0.03mm, ngaphandle kwalokho ukukhanya kuzokwenzeka kalula.

4). Melt Temperature

Ingalinganiswa ngendlela yomjovo womoya, kusukela ku-270-295°C, futhi ibanga elithuthukisiwe le-GF-PET lingasethwa ku-290-315°C, njll.

5). Isivinini sokujova

Ngokuvamile, isivinini somjovo kufanele sisheshe ukuvimbela ukuhlangana ngaphambi kwesikhathi ngesikhathi sokujova. Kodwa ngokushesha okukhulu, izinga lokugunda liphezulu, okwenza izinto zibe brittle. Umjovo uvamise ukwenziwa phakathi kwamasekhondi angu-4.

6). Ukucindezela Emuva

Okuphansi kungcono ukugwema ukuguga. Ngokuvamile hhayi ngaphezu kwe-100bar, ngokuvamile ayidingi ukusebenzisa.
7). Isikhathi Sokuhlala

Ungasebenzisi isikhathi eside kakhulu sokuhlala ukuze uvimbele ukuncipha kwesisindo samangqamuzana, futhi uzame ukugwema izinga lokushisa elingaphezu kuka-300°C. Uma umshini uvaliwe isikhathi esingaphansi kwemizuzu engu-15, udinga kuphela ukuphathwa ngomjovo womoya; uma kungaphezu kwemizuzu engu-15, kufanele ihlanzwe nge-viscosity PE, futhi izinga lokushisa lomshini womshini kufanele lehliselwe ekushiseni kwe-PE kuze kube yilapho livulwa futhi.
8). Izinyathelo zokuzivikela

Izinto ezisetshenziswe kabusha akufanele zibe zikhulu kakhulu, ngaphandle kwalokho, kulula ukubangela "ibhuloho" endaweni yokusika futhi kuthinte i-plasticization; uma ukulawulwa kwezinga lokushisa kwesikhunta kungalungile, noma izinga lokushisa lempahla lingalawulwa kahle, kulula ukukhiqiza "inkungu emhlophe" ne-opaque; izinga lokushisa lesikhunta liphansi futhi lifana, Ijubane lokupholisa liyashesha, i-crystallization incane, futhi umkhiqizo ubonakala obala.