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 nephuzu eliphakeme lokuncibilika, kuyadingeka ukukhetha uhlelo lomjovo olunezigaba eziningi zokulawula izinga lokushisa kanye nesizukulwane sokushisa esingaphansi kwe-self-friction ngesikhathi se-plasticization, futhi isisindo sangempela somkhiqizo (impahla equkethe amanzi) 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.