Iwe Unoziva Aya Ekuchengetedza KwePET Preforms?

PET Preforms

Pasi peimwe tembiricha uye kumanikidzwa, mold inozadzwa nezvinhu zvakasvibirira, uye pasi pekugadziriswa kwemushini wekuumba jekiseni, inogadziriswa kuita preform ine humwe hukobvu uye urefu hunoenderana nekuumbwa. PET preforms inodzokororwa nekuvhuvhuta kuumba mabhodhoro epurasitiki, kusanganisira mabhodhoro anoshandiswa muzvizoro, mushonga, hutano hwehutano, zvinwiwa, mineral water, reagents, etc. Nzira yekugadzira PET mabhodhoro epurasitiki kuburikidza nekuputika.

1. Hunhu hwePET Raw Materials
Kujeka kwakakwirira kudarika 90%, kupenya kwepamusoro kwakanakisa, uye kutaridzika kwegirazi; kunhuhwirira kwakanaka, kusimba kwemhepo kwakanaka; kupikisa kwemakemikari kwakanakisisa, uye inenge yose mishonga yemakemikari inopikisa acids; pfuma yehutsanana yakanaka; haizopise Toxic gasi inogadzirwa; hunhu hwesimba hwakanakisa, uye hunhu hwakasiyana hunogona kuvandudzwa ne biaxial kutambanudza.

2. Hunyoro hwakaoma
Nekuti PET ine mwero wakati wekutora mvura, inotora mvura yakawanda panguva yekufambisa, kuchengetedza uye kushandiswa. Huwandu hwehunyoro hunowedzera panguva yekugadzira:

Kuwedzera kweAA (Acetaldehyde) acetaldehyde.

Kunhuwa kwekuita pamabhodhoro, zvichikonzera off-flavour (asi diki mhedzisiro pavanhu)

- IV (IntrinsicViscosity) viscosity inodonha.

Iyo inokanganisa kudzvinyirira kupikisa kwebhodhoro uye iri nyore kuputsa. (Iyo yakakosha inokonzerwa neiyo hydrolytic degradation yePET)

Panguva imwecheteyo, gadzira tembiricha yekugadzirira yePET ichipinda mumushini wekuumba jekiseni wekugera plasticization.

3. Kuomesa Zvinodiwa
Kuomesa seti tembiricha 165 ℃-175 ℃

Nguva yekugara 4-6 maawa

Kupisa kwechiteshi chekudya kunodarika 160 ° C

Dova pazasi -30 ℃

Kuyerera kwemhepo yakaoma 3.7m⊃3; /h pakg/h

4. Kuoma
Iyo yakakodzera mwando yemukati mushure mekuoma ndeye: 0.001-0.004%

Kunyanya kuoma kunogonawo kuwedzera:

Kuwedzera kweAA (Acetaldehyde) acetaldehyde

-IV (IntrinsicViscosity) viscosity inodonha

(Kunyanya kukonzerwa neoxidative degradation yePET)

5. Zvinhu Zvisere muInjection Molding
1). Kuraswa kwePlastiki

Sezvo PET macromolecules ane lipid mapoka uye ane imwe dhigirii ye hydrophilicity, pellets inonzwa kumvura pakupisa kwakanyanya. Kana hunyoro hwemukati hwapfuura muganho, huremu hwePET hunodzikira panguva yekugadziriswa, uye chigadzirwa chinova neruvara uye brittle.
Nokudaro, kusati kwaitwa, zvinhu zvinofanira kuomeswa, uye kutonhora kwekuoma kuri 150 ° C kwemaawa anopfuura mana; kazhinji 170 ° C kwemaawa 3-4. Kuoma kwakakwana kwezvinhu kunogona kuongororwa nemhepo yekupfura nzira. Kazhinji, chikamu chePET preform zvinhu zvakadzokororwa hachifanire kudarika 25%, uye zvinhu zvakadzokororwa zvinofanirwa kuomeswa.

2). Injection Molding Machine Sarudzo

Nekuda kwenguva pfupi yakagadzikana yePET mushure mekunyunguduka uye nzvimbo yakakwira yekunyungudika, zvinodikanwa kusarudza jekiseni ine mamwe ekudzora tembiricha zvikamu uye kushoma-kukanda kupisa chizvarwa panguva yepurasitiki, uye huremu chaihwo hwechigadzirwa (mvura. -ine zvinhu) haifanire kunge iri shoma pane jekiseni remuchina. 2/3 yehuwandu.

3). Mold uye Gedhi Dhizaini

PET preforms anowanzo umbwa neanopisa mumhanyi mold. Zvakanakisa kuve nenhoo yekupisa pakati pe mold uye jekiseni molding muchina template. Ukobvu hwechidzitiro chekupisa hunenge 12mm, uye chidzitiro chekupisa chinofanira kukwanisa kumira zvakanyanya. Iyo epositi inofanirwa kukwana kudzivirira kupisa kwenzvimbo kana kupatsanuka, asi kudzika kwechiteshi chekuburitsa hakufanire kudarika 0.03mm, zvikasadaro kupenya kunoitika nyore.

4). Melt Temperature

Inogona kuyerwa nenzira yejekiseni remhepo, kubva pa270-295 ° C, uye giredhi rakagadziridzwa GF-PET rinogona kuiswa pa290-315 ° C, nezvimwe.

5). Jekiseni Speed

Kazhinji, kumhanya kwejekiseni kunofanirwa kunge kuri kukurumidza kudzivirira nguva isati yakwana coagulation panguva yejekiseni. Asi nekukasira, shear rate yakakwira, zvichiita kuti zvinhu zvipere. Jekiseni rinowanzoitwa mukati memasekonzi mana.

6). Back Pressure

Iyo yakaderera zviri nani kudzivirira kusakara uye kubvaruka. Kazhinji kwete kupfuura 100bar, kazhinji haidi kushandisa.
7). Nguva Yekugara

Usashandise nguva yakareba yekugara kudzivirira kudzikira kwehuremu hwemamorekuru, uye edza kudzivirira tembiricha inopfuura 300 ° C. Kana muchina wacho wakavharwa kwemaminetsi asingasviki gumi nemashanu, unongoda kurapwa nejekiseni remhepo; kana inopfuura maminetsi gumi nemashanu, inofanira kucheneswa ne viscosity PE, uye tembiricha yemuchina webhodhoro inofanira kuderedzwa kusvika kune tembiricha yePE kusvikira yavhurwa zvakare.
8). Zvekungwaririra

Zvinhu zvakadzokororwa hazvifanirwe kunge zvakakura, kana zvisina kudaro, zviri nyore kukonzera "bhiriji" panzvimbo yekucheka uye inokanganisa plasticization; kana iyo mold tembiricha yekudzora isiri yakanaka, kana tembiricha yezvinhu isina kudzorwa zvakanaka, zviri nyore kugadzira "white fog" uye opaque; iyo mold tembiricha yakaderera uye yunifomu, Iyo yekutonhora inomhanya inokurumidza, iyo crystallization ishoma, uye chigadzirwa chiri pachena.