Iindaba

Kwiminyaka yakutshanje, kukho inkqubo ye-multi-screw extruder esekwe kwimarike njengenye indlela yokuNyedwa - i-screw extruders enenkqubo yokomisa kwangaphambili. (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 zinokuzilungelelanisa 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 enjalo ekushiseni kunye namaxesha okumisa ancitshiswe kuluhlu lwe-8.5 ukuya kwimizuzu engama-20 ngokuxhomekeke kwisicelo esithile, ngelixa iiyure eziliqela 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.