Iindaba

Kwiminyaka yakutshanje, kukho inkqubo ye-multi-screw extruder eye yasekwa kwimarike njengenye indlela ye-Single - screw extruders nge-pre-drying system. (Apha sibiza inkqubo ye-multi-screw extrudering kuquka i-Twin-screw extruders, i-Planetary roller extruders njl.)

Kodwa sicinga ukuba kuyimfuneko ukuba nenkqubo yokomisa kwangaphambili nokuba usebenzisa i-multi-screw extruder. Ngenxa yokuba:

I-1) I-multi-screw extruders into abanayo yonke iyinkimbinkimbi kakhulu ye-vacuum-degassing systems efakwe kwi-extruder ukuthintela umphumo we-hydrolysis ukwenzeka ngenxa yokungabikho kwenkqubo yokumisa kwangaphambili. Ngokuqhelekileyo uhlobo olunjalo lwe-extruder eyahlukileyo usebenzisa imeko:

Ubuninzi bokufuma kwesondlo obuvumelekileyo akufuneki bube ngaphezulu kwe-3000 ppm (0.3 %)

Enyanisweni, ii-Bottle flakes zibonisa ukuhluka kobunyulu, ubukhulu be-particle, ukusabalalisa ubungakanani be-particle kunye nobukhulu - kwaye ngakumbi kumswakama. Iiflake zasemva kwabathengi zivumela ukugcina ukuya kuthi ga kwi-5,000 ppm yokufuma kwimveliso kunye nokugcina amaxesha amaninzi lo myinge wamanzi kumphezulu wawo. Kwamanye amazwe, ukufuma kwesondlo kunokuya kuthi ga kwi-14,000 ppm nokuba kupakishwe kwi-Big Bag.

Zombini inqanaba elipheleleyo lomxholo wamanzi kunye nokwahluka kwawo, okungenakuphepheka, ngumngeni wangempela we-multi-screw extruder kunye nengcamango ehambelanayo yokukhupha. Oku kuhlala kubangela ukuguquguquka kwenkqubo, okubonakalayo kuxinzelelo oluguquguqukayo kakhulu lwemveliso ye-extruder.Kunokwenzeka kakhulu ukuba isixa esibalulekileyo sokufuma sisahleli njengoko sifikelela kwisigaba saso sokunyibilika kwi-extruder ngenxa yenqanaba lokufuma lokuqala kwi-extruder. i-resin, kunye nemali esusiweyo ngexesha le-vacuum

2) I-PET i-hygroscopic kakhulu kwaye ifunxa ukufuma kwi-atmosfera. Ubuninzi obuncinci bomswakama uya ku-hydrolyze i-PET kwisigaba sokunyibilika, ukunciphisa ubunzima be-molecular. I-PET kufuneka yome kanye phambi kokulungiswa, kwaye i-amorphous PET idinga ukukhazimla phambi kokuba yomiswe ukuze amasuntswana angabambeleli kunye njengoko ehamba ngeglasi yokutshintsha.

I-Hydrolysis ingenzeka ngenxa yokufuma kwaye oku kaninzi kunokubonwa njengokunciphisa i-IV (Intrinsic Viscosity) yemveliso. I-PET yi "semi-crystalline". Xa i-IV iyancipha, iibhotile ziyancipha kwaye zivame ukungaphumeleli "kwisango" (indawo yokujova) ngexesha lokuvuthela kunye nokuzaliswa.

Kwimeko yayo "ye-crystalline" ineenxalenye ze-crystalline kunye ne-amorphous kwisakhiwo sayo se-molecular. Inxalenye ye-crystalline ikhula apho iimolekyuli zikwazi ukulungelelanisa kwisakhiwo esincinci kakhulu. Kwimimandla engeyiyo i-crystalline iimolekyuli zikwilungiselelo elingaqhelekanga. Ngokuqinisekisa ukuba i-crystallinity yakho iphezulu, ngaphambi kokucubungula, umphumo uya kuba yinto efanayo kunye nemveliso ephezulu.

I-ODE Yenziwe I-IRD I-Infrared Rotary Drum Systems yenze le misebenzi ingaphantsi ngendlela eyonga amandla ngakumbi. Imitha ye-infrared eyilwe ngokukhethekileyo ivuselela ukuguquguquka kobushushu kwimolekyuli kwimathiriyeli eyomileyo ngokuthe ngqo ngaphandle kokuthatha inyathelo eliphakathi elingasebenziyo lokusebenzisa umoya oshushu. Indlela yokufudumeza elolo hlobo ekushiseni kunye namaxesha okumisa ancitshiswe ukuya kuluhlu oluyi-8.5 ukuya kwimizuzu engama-20 kuphela ngokuxhomekeke kwisicelo esithile, ngelixa iiyure ezininzi kufuneka zibalwe kwiinkqubo eziqhelekileyo zomoya oshushu okanye owomileyo.

Ukomiswa kwe-infrared kunokuphucula kakhulu ukusebenza kwe-twin-screw extruder kuba kunciphisa ukuthotywa kwamaxabiso e-IV kunye nokuphucula kakhulu ukuzinza kwenkqubo yonke.