Shin Kun San waɗannan Ka'idodin Don Preforms na PET?

PET Preforms

A ƙarƙashin wasu zafin jiki da matsa lamba, ƙirar tana cike da albarkatun ƙasa, kuma a ƙarƙashin sarrafa na'urar gyare-gyaren allura, ana sarrafa shi a cikin preform tare da wani kauri da tsayi daidai da ƙirar. PET preforms ana reprocessed by busa gyare-gyare don samar da roba kwalabe, ciki har da kwalabe amfani da kayan shafawa, magani, kiwon lafiya, abubuwan sha, ma'adinai ruwa, reagents, da dai sauransu Hanyar forming PET roba kwalabe ta hanyar busa gyare-gyare.

1. Halayen PET Raw Materials
Ma'anar gaskiya yana da girma fiye da 90%, mai sheki mai kyau yana da kyau, kuma bayyanar yana da gilashi; riƙe da ƙanshi yana da kyau, ƙarancin iska yana da kyau; juriya na sinadarai yana da kyau, kuma kusan dukkanin magungunan ƙwayoyin cuta suna jure wa acid; kayan tsabta yana da kyau; ba zai ƙone iskar gas mai guba ba; Halayen ƙarfin suna da kyau sosai, kuma ana iya haɓaka halaye daban-daban ta hanyar shimfida biaxial.

2. Bushewar Danshi
Saboda PET yana da wani mataki na sha ruwa, zai sha ruwa mai yawa yayin sufuri, ajiya da amfani. Babban matakan danshi zai tsananta yayin samarwa:

- Ƙara AA (Acetaldehyde) acetaldehyde.

Tasirin wari akan kwalabe, yana haifar da abubuwan dandano (amma kadan tasiri akan mutane)

- IV (IntrinsicViscosity) raguwar danko.

Yana rinjayar juriya na kwalabe kuma yana da sauƙin karya. (Asalin ya samo asali ne ta hanyar lalacewar hydrolytic na PET)

A lokaci guda, yi high zafin jiki shirye-shirye domin PET shigar da allura gyare-gyaren inji for karfi robobi.

3. Bukatun bushewa
bushewa saita zafin jiki 165 ℃-175 ℃

Lokacin zama 4-6 hours

Zazzabi na tashar ciyarwa yana sama da 160 ° C

Raɓa a ƙasa -30 ℃

Busassun iska 3.7m⊃3; /h da kg/h

4. bushewa
Kyakkyawan abun ciki na danshi bayan bushewa shine: 0.001-0.004%

Yawan bushewa kuma na iya tsananta:

- Ƙara AA (Acetaldehyde) acetaldehyde

-IV (IntrinsicViscosity) raguwar danko

(Ainihin lalacewa ta hanyar lalatawar oxidative na PET)

5. Abubuwa Takwas a cikin Gyaran allura
1). Zubar da Filastik

Tunda PET macromolecules sun ƙunshi ƙungiyoyin lipid kuma suna da takamaiman matakin hydrophilicity, pellets suna kula da ruwa a yanayin zafi. Lokacin da abun ciki na danshi ya wuce iyaka, nauyin kwayoyin halitta na PET yana raguwa yayin aiki, kuma samfurin ya zama mai launi da raguwa.
Sabili da haka, kafin aiki, dole ne a bushe kayan, kuma bushewar zafin jiki shine 150 ° C fiye da sa'o'i 4; kullum 170 ° C na 3-4 hours. Ana iya bincika cikakken bushewar kayan ta hanyar harbin iska. Gabaɗaya, rabon PET preform kayan da aka sake fa'ida bai kamata ya wuce 25% ba, kuma kayan da aka sake fa'ida yakamata a bushe sosai.

2). Zaɓin Injin Gyaran allura

Saboda ɗan gajeren lokacin kwanciyar hankali na PET bayan wurin narkewa da babban wurin narkewa, ya zama dole don zaɓar tsarin allura tare da ƙarin sassan kula da zafin jiki da ƙarancin ƙarancin zafin jiki yayin yin filastik, da ainihin nauyin samfurin (ruwa). -dauke da kayan) kada ya zama ƙasa da allurar inji. 2/3 na adadin.

3). Mold da Ƙofar Ƙofar

PET preforms gabaɗaya ana yin su ta hanyar ƙwararrun masu gudu masu zafi. Zai fi kyau a sami garkuwar zafi tsakanin ƙirar da samfurin injin gyare-gyaren allura. Kaurin garkuwar zafi yana da kusan 12mm, kuma garkuwar zafi dole ne ta iya jure matsanancin matsin lamba. Shaye-shaye dole ne ya wadatar don guje wa zafi na gida ko rarrabuwa, amma zurfin tashar shaye-shaye bai kamata ya wuce 0.03mm gabaɗaya ba, in ba haka ba za a iya walƙiya cikin sauƙi.

4). Narke Zazzabi

Ana iya auna shi ta hanyar allurar iska, kama daga 270-295 ° C, kuma ana iya saita ingantaccen darajar GF-PET a 290-315 ° C, da sauransu.

5). Gudun allura

Gabaɗaya, saurin allura ya kamata ya kasance cikin sauri don hana haɗuwa da wuri yayin allura. Amma da sauri sosai, raguwar raguwa yana da yawa, yana sa kayan ya lalace. Ana yin allurar yawanci a cikin daƙiƙa 4.

6). Matsin baya

Ƙananan mafi kyau don kauce wa lalacewa. Gabaɗaya bai wuce mashaya 100 ba, yawanci baya buƙatar amfani.
7). Lokacin zama

Kada ku yi amfani da lokacin zama mai tsawo don hana raguwar nauyin kwayoyin halitta, kuma kuyi ƙoƙarin guje wa zafin jiki sama da 300 ° C. Idan na'urar ta rufe kasa da mintuna 15, sai a yi mata allurar iska kawai; idan ya wuce minti 15, dole ne a tsaftace shi da danko PE, kuma zafin jiki na injin ya kamata a saukar da shi zuwa zafin jiki na PE har sai an sake kunna shi.
8). Matakan kariya

Abubuwan da aka sake yin fa'ida kada su zama babba, in ba haka ba, yana da sauƙi don haifar da "gada" a wurin yankewa kuma ya shafi filastik; idan tsarin zafin jiki na mold ba shi da kyau, ko kuma kayan zafin jiki ba a sarrafa shi da kyau ba, yana da sauƙi don samar da "fararen hazo" da opaque; da mold zafin jiki ne low kuma uniform, The sanyaya gudun ne da sauri, da crystallization ne m, da samfurin ne m.