Koj puas paub cov kev ceev faj rau PET Preforms?

PET Preforms

Nyob rau hauv tej yam kub thiab siab, cov pwm yog sau nrog raw cov ntaub ntawv, thiab nyob rau hauv kev ua ntawm lub txhaj tshuaj molding tshuab, nws yog ua tiav rau hauv ib tug preform nrog ib tug tej thickness thiab qhov siab sib thooj rau cov pwm. PET preforms yog reprocessed los ntawm tshuab moulding los tsim lub raj mis yas, nrog rau cov fwj siv nyob rau hauv tshuaj pleev ib ce, tshuaj, kev kho mob, dej haus, mineral dej, reagents, thiab lwm yam.

1. Yam ntxwv ntawm PET Raw Materials
Lub pob tshab yog siab li ntau tshaj 90%, lub ntsej muag gloss yog zoo heev, thiab cov tsos yog glassy; lub aroma tuav yog zoo heev, huab cua nruj yog zoo; cov tshuaj tiv thaiv zoo heev, thiab yuav luag tag nrho cov tshuaj organic yog resistant rau acids; cov khoom tu cev yog qhov zoo; nws yuav tsis hlawv cov pa toxic yog generated; Cov yam ntxwv ntawm lub zog yog qhov zoo heev, thiab ntau yam ntxwv tuaj yeem txhim kho ntxiv los ntawm biaxial stretching.

2. Cov dej noo qhuav
Vim tias PET muaj qee qhov kev nqus dej, nws yuav nqus dej ntau thaum thauj, khaws cia thiab siv. High noo noo yuav exacerbate thaum lub sij hawm tsim khoom:

- Nce ntawm AA (Acetaldehyde) acetaldehyde.

Cov tshuaj tsw qab rau lub raj mis, ua rau muaj ntxhiab tsw (tab sis tsis tshua muaj txiaj ntsig rau tib neeg)

- IV (IntrinsicViscosity) viscosity poob.

Nws cuam tshuam rau lub siab tsis kam ntawm lub raj mis thiab yooj yim tawg. (Lub ntsiab yog tshwm sim los ntawm hydrolytic degradation ntawm PET)

Nyob rau tib lub sijhawm, ua kom kub kub npaj rau PET nkag mus rau hauv lub tshuab txhaj tshuaj molding rau shear plasticization.

3. Kev xav kom qhuav
Qhuav teeb kub 165 ℃ -175 ℃

Lub sij hawm 4-6 teev

Qhov kub ntawm qhov chaw pub mis yog siab tshaj 160 ° C

Dew taw tes hauv qab -30 ℃

Cua qhuav 3.7m⊃3; /h rau kg/h

4. Qhuav
Cov dej noo zoo tshaj plaws tom qab ziab yog li: 0.001-0.004%

Cov dryness ntau dhau kuj tuaj yeem ua rau hnyav dua:

- Nce ntawm AA (Acetaldehyde) acetaldehyde

-IV (IntrinsicViscosity) viscosity poob

(Qhov tseem ceeb tshwm sim los ntawm oxidative degradation ntawm PET)

5. Yim yam hauv kev txhaj tshuaj molding
1). Kev pov tseg ntawm cov yas

Txij li thaum PET macromolecules muaj lipid pawg thiab muaj qee qhov kev xav tau ntawm hydrophilicity, pellets yog rhiab heev rau dej ntawm qhov kub thiab txias. Thaum cov dej noo ntau tshaj qhov txwv, qhov hnyav molecular ntawm PET txo qis thaum ua, thiab cov khoom yuav xim thiab nkig.
Yog li ntawd, ua ntej ua, cov khoom yuav tsum tau qhuav, thiab ziab kub yog 150 ° C rau ntau tshaj 4 teev; Feem ntau 170 ° C rau 3-4 teev. Qhov ua tiav dryness ntawm cov khoom tuaj yeem tshawb xyuas los ntawm kev txhaj tshuaj huab cua. Feem ntau, qhov kev faib ua feem ntawm PET preform recycled cov ntaub ntawv yuav tsum tsis txhob ntau tshaj 25%, thiab cov ntaub ntawv recycled yuav tsum tau kom qhuav kom huv si.

2). Txhaj Moulding Tshuab Xaiv

Vim lub sij hawm luv luv ntawm PET tom qab lub melting point thiab lub siab melting point, nws yog ib qhov tsim nyog los xaiv ib qho kev txhaj tshuaj nrog ntau qhov chaw tswj qhov kub thiab txias ntawm tus kheej-kev sib txhuam thaum lub sij hawm plasticization, thiab qhov tseeb qhov hnyav ntawm cov khoom (dej. -cov khoom siv) yuav tsum tsis txhob tsawg tshaj li kev txhaj tshuaj tshuab. 2/3 ntawm tus nqi.

3). Pwm thiab Gate Design

PET preforms feem ntau yog tsim los ntawm kub khiav pwm. Nws yog qhov zoo tshaj plaws kom muaj lub tshav kub tiv thaiv ntawm cov pwm thiab kev txhaj tshuaj molding tshuab template. Lub thickness ntawm lub tshav kub tiv thaiv yog hais txog 12 hli, thiab lub tshav kub tiv thaiv yuav tsum muaj peev xwm tiv taus siab. Cov pa tawm yuav tsum txaus kom tsis txhob muaj cua sov hauv zos lossis tawg, tab sis qhov tob ntawm qhov chaw nres nkoj yuav tsum tsis pub tshaj 0.03mm, txwv tsis pub flashing yuav yooj yim tshwm sim.

4). Melt kub

Nws tuaj yeem ntsuas tau los ntawm txoj kev txhaj tshuaj huab cua, xws li 270-295 ° C, thiab qib GF-PET tuaj yeem raug teeb tsa ntawm 290-315 ° C, thiab lwm yam.

5). Txhaj Ceev

Feem ntau, qhov kev txhaj tshuaj yuav tsum ceev ceev kom tsis txhob ntxov ntxov coagulation thaum txhaj tshuaj. Tab sis ceev heev, tus nqi shear yog siab, ua rau cov khoom nkig. Kev txhaj tshuaj feem ntau ua tiav hauv 4 vib nas this.

6). Rov Qab Siab

Qhov qis dua qhov zoo dua kom tsis txhob hnav thiab tsim kua muag. Feem ntau tsis ntau tshaj 100bar, feem ntau tsis tas yuav siv.
7). Lub sij hawm nyob

Tsis txhob siv lub sijhawm nyob ntev dhau los txhawm rau tiv thaiv qhov hnyav ntawm molecular, thiab sim zam qhov kub siab tshaj 300 ° C. Yog tias lub tshuab raug kaw tsawg dua 15 feeb, nws tsuas yog yuav tsum tau kho nrog cua txhaj tshuaj; yog tias nws yog ntau tshaj 15 feeb, nws yuav tsum tau muab ntxuav nrog viscosity PE, thiab qhov kub ntawm lub tshuab chim yuav tsum tau txo qis rau PE kub kom txog thaum nws rov qhib dua.
8). Cov kev ceev faj

Cov ntaub ntawv rov qab yuav tsum tsis txhob loj dhau, txwv tsis pub, nws yooj yim ua rau "choj" ntawm qhov chaw txiav thiab cuam tshuam rau plasticization; Yog tias cov pwm tswj qhov kub tsis zoo, lossis cov khoom siv kub tsis tswj tau zoo, nws yooj yim los tsim "dawb pos huab" thiab opaque; Cov pwm kub yog qhov tsawg thiab tsis sib xws, qhov txias txias yog ceev, crystallization tsawg dua, thiab cov khoom yog pob tshab.