Hunhu hwePET preforms

Polyethylene terephthalate (PET), inozivikanwa sepolyester, ipurasitiki inoshandiswa zvakanyanya. Kugadzirwa kwe Mabhodhoro ePET inogona kukamurwa kuita maitiro maviri makuru zvichienderana nerudzi rwe preform: injection stretch blow molding (ISBM) uye extrusion stretch blow molding (ESBM). Pakati penzira mbiri idzi, ISBM inonyanya kushandiswa nekuda kwekureruka kwayo kudzora, kushanda kwayo zvakanyanya, uye mwero wakaderera wezvimedu zvetsvina. Mukugadzira blow-molded mabhodhoro ezvizoro, machipisi ePET anotanga apinzwa mu preform. Zvinodiwa kuti chikamu chezvinhu zvakadzokororwa chisanyanya kukwira (pasi pe5%), uye kudzokororwa hakufanirwe kudarika kaviri. Kurema kwemamorekuru nekupenya hazvifanirwe kunge zvakaderera zvakanyanya (kurema kwemamorekuru 31,000 - 50,000, kupenya kwemukati 0.78 - 0.85 cm³/g). Sekureva kweNational Food Safety Law, zvinhu zvakadzokororwa hazvibvumidzwe kushandiswa pakurongedza chikafu nemishonga. Preforms dzinogadzirwa nejekiseni dzinofanirwa kuchengetwa kwemaawa anopfuura makumi maviri nemana dzisati dzashandiswa. Preforms dzisina kushandiswa mushure mekudziya dzinofanira kuchengetwa kwemaawa anopfuura makumi mana nemasere dzisati dzadziiswazve.

Nguva yekuchengetera mabhodhoro ezvizoro Hazvifanirwe kudarika mwedzi mitanhatu. Hunhu hwema preform hunonyanya kuenderana nemhando yezvinhu zvePET. Saka, zvakakosha kusarudza zvinhu zviri nyore kuputira nekuumba, uye kugadzira maitiro akakodzera ekugadzira preform. Kuedza kunoratidza kuti ma preform akagadzirwa nezvinhu zvakatorwa kunze kwenyika ari nyore kuputira-mold pane ayo akagadzirwa nezvinhu zvakabikwa zvemumba zvine viscosity yakafanana. Zvisinei, kune ma preform ebatch imwe chete, mazuva akasiyana ekugadzira anogona kuda maitiro akasiyana ekugadzira blow-molding. Hunhu hwema preform hunosarudza kuoma kwemaitiro ekugadzira blow-molding. Zvinodiwa zve preforms dze Mabhodhoro ePET zvinosanganisira kuva yakachena, yakajeka, isina tsvina uye ruvara, ine nzvimbo yakakodzera yekupinza uye denderedzwa rakaipoteredza.

Chekutanga, saizi ye preform ye Mabhodhoro ePET Zvakakosha pamudziyo wekupedzisira wekurongedza. Pakusarudza saizi ye preform, chinhu chekutanga chinofanira kufungwa nezvacho ndechekuita mabhodhoro ezvizoro. Ndezvekudya, zvinwiwa, zvekuzora, kana zvimwe zvinhu here? Zvinangwa zvakasiyana zvingada maumbirwo akasiyana uye kugona kwemabhodhoro ekuzora. Nekunyatsoongorora kugona kwechigadzirwa, kugona kwepreform kunogona kuonekwa, uye chimiro chakakodzera chinogona kusarudzwa, senge denderedzwa, sikweya, kana denderedzwa.

Chechipiri, dhayamita yemutsipa (kana muromo) ndiyo chinhu chakakosha. Paunenge uchiyera mutsipa, iva nechokwadi chekuti chiyero chacho chakatarwa kuti uwane saizi chaiyo yedhayamita. Saizi yemutsipa inokanganisa zvakananga kuzadza nekudurura kwemvura. Mabhodhoro ePETZvigadzirwa zvakasiyana zvinogona kuda saizi dzakasiyana dzemutsipa, saka kusarudza mutsipa kwakakodzera kunodiwa pakugadzira bhodhoro.

Pakupedzisira, huremu hwe preform hunoreva huremu hwe mabhodhoro ezvizoro, kusanganisira muviri nemutsipa. Huremu hunogona kuyerwa nemazvo nekuyera kana kushandisa chikero chemupendero. Kuongororwa kwehuremu kunoenderana zvakananga nekusimba uye kugara kwenguva refu kwebhodhoro. Pakufunga nezvehuremu, zvakakosha kuyera simba remaumbirwo ebhodhoro uye mutengo wezvinhu kuti ive nechokwadi chekuti chigadzirwa chekupedzisira chine simba rakakwana uye chinosangana nezvinodiwa zvemari.
Zvose, saizi, dhayamita yemutsipa, uye huremu hwe preform ye Mabhodhoro ePET zvinhu zvakakosha pakugadzira mabhodhoro epurasitikiNekuyera nekungwarira uye kusarudza zvinoyera izvi, zvinokwanisika kuve nechokwadi chekuti bhodhoro rekupedzisira rinosangana nezvinodiwa zvechigadzirwa uye zviyero zveindasitiri, zvichipa mashandiro akanaka ekurongedza. Munguva yekugadzira mabhodhoro, kutarisisa nguva dzose kudzora zvinoyera izvi kuchabatsira kugadzira mabhodhoro epurasitiki emhando yepamusoro.