Ngaba uyayazi le miQathango ye-PET Preforms?

I-PET Preforms

Ngaphantsi kobushushu obuthile kunye noxinzelelo, isikhunta sizaliswe ngezinto eziluhlaza, kwaye phantsi kokulungiswa komatshini wokubumba umjovo, ucutshungulwa kwi-preform enobunzima obuthile kunye nokuphakama okuhambelana nokubumba. I-PET preforms iphinda ihlaziywe ngokubunjwa ngokuvuthela ukwenza iibhotile zeplastiki, kubandakanywa iibhotile ezisetyenziselwa izimonyo, iyeza, ukhathalelo lwempilo, iziselo, amanzi amaminerali, i-reagents, njl. Indlela yokwenza iibhotile zeplastiki ze-PET ngokubunjwa.

1. Iimpawu ze-PET Raw Materials
I-transparency iphezulu ngaphezu kwe-90%, iglosi yomphezulu igqwesileyo, kunye nenkangeleko yeglasi; Ukugcinwa kwevumba kuhle, ukuxinana komoya kulungile; ukuxhathisa imichiza kuhle kakhulu, kwaye phantse zonke iziyobisi eziphilayo zixhathisa kwiiasidi; ipropati yococeko ilungile; ayiyi kutshisa Irhasi enetyhefu yenziwa; iimpawu zamandla zigqwesile, kunye neempawu ezahlukeneyo zinokuphuculwa ngakumbi ngokusolula kwe-biaxial.

2. Ukufuma okomileyo
Ngenxa yokuba i-PET inomlinganiselo othile wokufunxa amanzi, iya kutsala amanzi amaninzi ngexesha lokuthutha, ukugcinwa kunye nokusetyenziswa. Amanqanaba aphezulu okufuma aya kuba mandundu ngexesha lemveliso:

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

Umphumo onukayo kwiibhotile, okhokelela kwi-off-flavour (kodwa impembelelo encinci ebantwini)

- IV (IntrinsicViscosity) i-viscosity drop.

Ichaphazela ukunyanzeliswa koxinzelelo lwebhotile kwaye kulula ukuphuka. (Undoqo ubangelwa kukuthotywa kwe-hydrolytic ye-PET)

Kwangaxeshanye, yenza amalungiselelo obushushu obuphezulu be-PET ingena kumatshini wokubumba inaliti yokucheba iplastiki.

3. Iimfuno zokomisa
Ukomisa iqondo lokushisa 165℃-175℃

Ixesha lokuhlala 4-6 iiyure

Ubushushu bezibuko lokutyisa bungaphezulu kwe-160°C

Indawo yombethe ngaphantsi -30℃

Ukuhamba komoya owomileyo 3.7m⊃3; /h ngekg/h

4. Ukomisa
Ubumanzi obufanelekileyo emva kokumisa malunga: 0.001-0.004%

Ukomisa ngokugqithisileyo nako kusenokwenza mandundu:

- Ukunyuka kwe-AA (Acetaldehyde) i-acetaldehyde

-IV (IntrinsicViscosity) i-viscosity drop

(Eyona nto ibangelwa kukuthotywa kwe-oxidative ye-PET)

5. Izinto ezisibhozo kwi-Injection Molding
1). Ukulahlwa kwePlastiki

Ekubeni i-PET macromolecules iqulethe amaqela e-lipid kwaye inomlinganiselo othile we-hydrophilicity, iipellets zivakalelwa kumanzi kumaqondo aphezulu. Xa ubumanzi bungaphezu komlinganiselo, ubunzima bemolekyuli bePET buyancipha ngexesha lokulungiswa, kwaye imveliso iba nemibala kwaye inkukuma.
Ngoko ke, ngaphambi kokucutshungulwa, izinto eziphathekayo kufuneka zomiswe, kwaye izinga lokushisa lokumisa liyi-150 ° C ngaphezu kweeyure ezingama-4; ngokubanzi 170 ° C iiyure 3-4. Ukomisa okupheleleyo kwezinto kunokujongwa ngendlela yokudubula emoyeni. Ngokubanzi, umyinge we-PET preform imathiriyeli esetyenzisiweyo akumele udlule i-25%, kwaye izinto ezisetyenzisiweyo kufuneka zomiswe kakuhle.

2). Isitofu sokubumba uKhetho loMtshini

Ngenxa yexesha elifutshane elizinzile le-PET emva kwendawo yokunyibilika kunye nenqanaba eliphezulu lokunyibilika, kuyafuneka ukuba ukhethe inkqubo yokutofa enamacandelo amaninzi okulawula ubushushu kunye nokuveliswa kobushushu obuncinci bokuzenzela ngexesha leplastiki, kunye nobunzima bokwenyani bemveliso (amanzi). -izinto eziphathekayo) akufanele zibe ngaphantsi kwenaliti yomatshini. 2/3 yemali.

3). Umngundo kunye noYilo lweSango

I-PET preforms idla ngokuyilwa kukungunda kweembaleki ezishushu. Kungcono ukuba ube nesikhuselo sobushushu phakathi komngundo kunye netemplate yomatshini wokubumba inaliti. Ubunzima bokukhusela ubushushu bu malunga ne-12mm, kwaye ikhuselo lobushushu kufuneka likwazi ukumelana noxinzelelo oluphezulu. Umbhobho wokuphuma kufuneka wanele ukunqanda ukushisa okugqithisileyo okanye ukwahlulwa kwendawo, kodwa ubunzulu bezibuko lokukhupha akufunekanga budlule ngokubanzi kwi-0.03mm, kungenjalo ukudanyaza kuya kwenzeka ngokulula.

4). Melt Ubushushu

Inokulinganiswa ngendlela ye-injection yomoya, ukusuka kwi-270-295 ° C, kunye nebakala eliphuculweyo le-GF-PET linokusekwa kwi-290-315 ° C, njl.

5). Isantya sokutofa

Ngokubanzi, isantya senaliti kufuneka sikhawuleze ukunqanda i-coagulation yangaphambi kwexesha ngexesha lokutofa. Kodwa ngokukhawuleza kakhulu, izinga lokucheba liphezulu, nto leyo eyenza ukuba izinto eziphathekayo zibe brittle. Isitofu siqhele ukwenziwa kwimizuzwana emi-4.

6). Uxinzelelo lwangasemva

Okusezantsi kungcono ukuphepha ukuguga nokukrazuka. Ngokubanzi akukho ngaphezulu kwe-100bar, ngokuqhelekileyo akufuneki ukuba usebenzise.
7). Ixesha lokuHlala

Musa ukusebenzisa ixesha elide kakhulu lokuhlala ukuthintela ukuhla kobunzima bemolekyuli, kwaye zama ukunqanda ubushushu obungaphezu kwama-300°C. Ukuba umatshini uvaliwe ngaphantsi kwemizuzu eyi-15, kufuneka uphathwe kuphela ngenaliti yomoya; ukuba ingaphezulu kwemizuzu eyi-15, kufuneka ihlambuluke nge-viscosity PE, kwaye iqondo lokushisa lombhobho womatshini kufuneka lithotywe kwiqondo lokushisa le-PE de livulwe kwakhona.
8). Ukulumkela

Izinto ezihlaziyiweyo akufanele zibe zikhulu kakhulu, ngaphandle koko, kulula ukubangela "ibhuloho" kwindawo yokusika kwaye ichaphazele iplastiki; ukuba ulawulo lokushisa lokubumba alulungile, okanye ubushushu bezinto eziphathekayo abulawulwa ngokufanelekileyo, kulula ukuvelisa "inkungu emhlophe" kunye ne-opaque; ubushushu bomngundo buphantsi kwaye bufana, Isantya sokupholisa sikhawuleza, icrystallization incinci, kwaye imveliso iyabonakala.