Kodi Mumadziwa Njira Zodzitetezera Izi Pazinthu za PET?

PET Preforms

 

Pansi pa kutentha ndi kupanikizika kwina, nkhungu imadzazidwa ndi zipangizo, ndipo pansi pa makina opangira jekeseni, imasinthidwa kukhala preform ndi makulidwe ena ndi kutalika kofanana ndi nkhungu.PET preforms reprocessed ndi kuwomba akamaumba kupanga mabotolo pulasitiki, kuphatikizapo mabotolo ntchito zodzoladzola, mankhwala, chisamaliro chaumoyo, zakumwa, mchere madzi, reagents, etc. Njira yopangira mabotolo apulasitiki a PET kupyolera mu kuwombera.

 

1. Makhalidwe a PET Raw Materials
Kuwonekera ndipamwamba kwambiri kuposa 90%, gloss pamwamba ndi yabwino kwambiri, ndipo maonekedwe ndi magalasi;kusungirako fungo labwino kwambiri, kulimba kwa mpweya kuli bwino;kukana kwa mankhwala ndikwabwino kwambiri, ndipo pafupifupi mankhwala onse okhala ndi organic samva ma acid;katundu waukhondo ndi wabwino;sichidzawotcha Mpweya wapoizoni umapangidwa;mawonekedwe amphamvu ndiabwino kwambiri, ndipo mawonekedwe osiyanasiyana amatha kupitilizidwa ndi kutambasula kwa biaxial.

 

2. Chinyezi chouma
Chifukwa PET ili ndi mlingo wina wa kuyamwa kwamadzi, imatenga madzi ambiri panthawi yoyendetsa, kusunga ndi kugwiritsa ntchito.Kuchuluka kwa chinyezi kumachulukirachulukira panthawi yopanga:

- Kuchulukitsa kwa AA (Acetaldehyde) acetaldehyde.

Kununkhira kwamabotolo, zomwe zimapangitsa kuti pakhale zokometsera (koma zotsatira zochepa pa anthu)

- IV (IntrinsicViscosity) kutsika kwakanthawi kochepa.

Zimakhudza kukana kukakamiza kwa botolo ndipo ndizosavuta kuswa.(Chomwe chimayamba chifukwa cha kuwonongeka kwa hydrolytic kwa PET)

Pa nthawi yomweyo, kupanga kutentha kukonzekera PET kulowa jekeseni akamaumba makina kwa kukameta ubweya plasticization.

 

3. Kuyanika Zofunikira
Kuyanika kutentha kwa 165 ℃-175 ℃

Nthawi yopuma 4-6 hours

Kutentha kwa doko lodyerako kuli pamwamba pa 160 ° C

Mame pansi -30 ℃

Mphepo yowuma 3.7m⊃3;/h pa kg/h

 

4. Kuuma
Chinyezi choyenera mukatha kuyanika ndi: 0.001-0.004%

Kuuma kwambiri kungayambitsenso:

- Kuchulukitsa kwa AA (Acetaldehyde) acetaldehyde

-IV (IntrinsicViscosity) kutsika kwamakasitomala

(Zomwe zimayambitsidwa ndi kuwonongeka kwa okosijeni kwa PET)

 

5. Zinthu zisanu ndi zitatu mu Kumangira jakisoni
1).Kutaya Pulasitiki

Popeza ma macromolecules a PET amakhala ndi magulu a lipid ndipo amakhala ndi hydrophilicity, ma pellets amakhudzidwa ndi madzi kutentha kwambiri.Chinyontho chikadutsa malire, kulemera kwa mamolekyu a PET kumachepa panthawi yokonza, ndipo mankhwalawo amakhala amtundu komanso osasunthika.
Choncho, musanagwiritse ntchito, zinthuzo ziyenera kuuma, ndipo kutentha kwakuya ndi 150 ° C kwa maola oposa 4;Nthawi zambiri 170 ° C kwa maola 3-4.Kuuma kwathunthu kwa zinthuzo kumatha kuwonedwa ndi njira yowombera mpweya.Nthawi zambiri, kuchuluka kwa zida zobwezerezedwanso za PET zisapitirire 25%, ndipo zida zobwezerezedwanso ziyenera kuuma bwino.

 

2).Kusankha Makina Opangira Jakisoni

Chifukwa chanthawi yayitali yokhazikika ya PET itatha malo osungunuka komanso malo osungunuka kwambiri, ndikofunikira kusankha jakisoni wokhala ndi magawo ambiri owongolera kutentha komanso kutulutsa kutentha kwapang'onopang'ono pakupanga pulasitiki, komanso kulemera kwenikweni kwa chinthucho (madzi). -zokhala ndi zinthu) zisakhale zochepa kuposa jekeseni wa makina.2/3 ya ndalamazo.

 

3).Mold ndi Gate Design

Ma PET preforms nthawi zambiri amapangidwa ndi nkhungu zothamanga.Ndi bwino kukhala ndi chishango cha kutentha pakati pa nkhungu ndi template ya makina opangira jekeseni.Kukula kwa chishango cha kutentha ndi pafupifupi 12mm, ndipo chishango cha kutentha chiyenera kupirira kupanikizika kwakukulu.Utsi uyenera kukhala wokwanira kupewa kutenthedwa kapena kugawikana kwanuko, koma kuya kwa doko la utsi sikuyenera kupitirira 0.03mm, apo ayi kung'anima kumachitika mosavuta.

 

4).Sungunulani Kutentha

Itha kuyezedwa ndi njira ya jakisoni wa mpweya, kuyambira 270-295 ° C, ndipo kalasi yowonjezereka ya GF-PET ikhoza kukhazikitsidwa pa 290-315 ° C, ndi zina zotero.

 

5).Kuthamanga kwa jekeseni

Nthawi zambiri, liwiro la jekeseni liyenera kukhala lachangu kuti mupewe kukomoka msanga pa jakisoni.Koma mofulumira kwambiri, kumeta ubweya wa ubweya kumakhala kokwera kwambiri, zomwe zimapangitsa kuti zinthuzo zikhale zolimba.Jekeseni nthawi zambiri imachitika mkati mwa masekondi anayi.

 

6).Kupanikizika Kwamsana

M'munsi ndi bwino kupewa kuvala ndi kung'ambika.Nthawi zambiri osapitilira 100bar, nthawi zambiri safunikira kugwiritsa ntchito.
7).Nthawi Yokhala

Musagwiritse ntchito nthawi yayitali yokhalamo kuti muchepetse kulemera kwa maselo, ndipo yesetsani kupewa kutentha kopitilira 300 ° C.Ngati makinawo atsekedwa kwa mphindi zosachepera 15, amangofunika kuthandizidwa ndi jekeseni wa mpweya;ngati ili ndi mphindi zoposa 15, iyenera kutsukidwa ndi viscosity PE, ndipo kutentha kwa mbiya yamakina kuyenera kutsitsidwa ku kutentha kwa PE mpaka kuyatsanso.
8).Kusamalitsa

Zida zobwezerezedwanso siziyenera kukhala zazikulu, apo ayi, ndizosavuta kuyambitsa "mlatho" pamalo odulira ndikukhudza pulasitiki;ngati kutentha kwa nkhungu sikuli bwino, kapena kutentha kwa zinthu sikuyendetsedwa bwino, n'zosavuta kutulutsa "chifunga choyera" ndi opaque;Kutentha kwa nkhungu kumakhala kochepa komanso kofanana, Kuthamanga kozizira kumathamanga, crystallization ndi yochepa, ndipo mankhwalawa ndi oonekera.


Nthawi yotumiza: Dec-31-2022