Nkhani

M'zaka zaposachedwapa, pali Mipikisano screw extruder dongosolo akhazikitsidwa mu msika monga njira Single - wononga extruders ndi dongosolo chisanadze kuyanika. (Apa timatcha ma multi-screw extrudering system kuphatikiza Twin-screw extruders, Planetary roller extruder etc.)

Koma tikuganiza kuti ndikofunikira kukhala ndi dongosolo loyanikapo ngakhale mukugwiritsa ntchito multi-screw extruder. Chifukwa:

1) Multi-screw extruders zomwe onse ali nazo ndizovuta kwambiri za vacuum-degassing systems zomwe zimayikidwa pa extruder kuti zisawonongeke chifukwa cha hydrolysis sichingachitike chifukwa cha ndondomeko yowumitsa isanayambe. Kawirikawiri mtundu woterewu wa extruder umasiyana ndi chikhalidwe:

Chinyezi chovomerezeka cha chakudya sichiyenera kupitirira 3000 ppm (0.3%)

M'malo mwake, ma flakes a botolo amawonetsa kusiyanasiyana kwa chiyero, kukula kwa tinthu, kukula kwa tinthu ndi makulidwe - makamaka chinyezi. Ma flakes obwera pambuyo pa ogula amalola kuti chinyezi chikhale chofikira 5,000 ppm ndikusunga nthawi zambiri madzi ochulukirapo pamwamba pake. M'mayiko ena, chinyezi cha chakudya chikhoza kufika 14,000 ppm ngakhale chodzaza mu Big Bag.

Zomwe zili mtheradi zamadzi ndi zosiyana zake, zomwe sizingapeweke, ndizovuta kwenikweni kwa multi-screw extruder ndi lingaliro logwirizana la degassing. Izi nthawi zambiri zimabweretsa kusinthasintha kwazinthu, komwe kumawonekera kuchokera ku zovuta zosinthika kwambiri za extruder.N'zotheka kwambiri kuti chinyezi chochulukirapo chikadalipobe pomwe chikufikira gawo lake losungunuka mu extruder chifukwa cha kuchuluka kwa chinyezi mu. utomoni, ndi kuchuluka kwa kuchotsedwa pa vacuum

2) PET imakhala ndi hygroscopic kwambiri ndipo imatenga chinyezi kuchokera mumlengalenga. Kuchepa pang'ono kwa chinyezi kumatsitsimutsa PET mu gawo losungunuka, kuchepetsa kulemera kwa maselo. PET iyenera kukhala yowuma isanayambe kukonzedwa, ndipo PET ya amorphous PET imafuna kuunika musanayambe kuyanika kuti tinthu ting'onoting'ono zisagwirizane pamene zikupita ngakhale kusintha kwa galasi.

Hydrolysis imatha kuchitika chifukwa cha chinyezi ndipo izi nthawi zambiri zimatha kuwonedwa ngati kuchepa kwa IV (Intrinsic Viscosity) ya mankhwalawa. PET ndi "semi-crystalline". Pamene IV imachepetsedwa, mabotolo amakhala ovuta kwambiri ndipo amatha kulephera pa "chipata" (malo opangira jekeseni) panthawi yowombera ndi kudzaza.

Mu "crystalline" yake imakhala ndi magawo a crystalline ndi amorphous mu mawonekedwe ake a maselo. Gawo la crystalline limayamba pomwe mamolekyu amatha kudzigwirizanitsa okha mumzere wophatikizika kwambiri. M'madera osakhala a crystalline mamolekyu ali mu dongosolo lachisawawa. Mwa kutsimikizira kuti crystallinity yanu ndi yapamwamba, isanayambe kukonzedwa, zotsatira zake zidzakhala zofanana komanso zapamwamba kwambiri.

ODE Made IRD Infrared Rotary Drum Systems achita izi m'njira yochepetsera mphamvu. Ma radiation afupiafupi opangidwa ndi ma infrared amathandizira kusinthasintha kwa kutentha kwa maselo muzinthu zowuma mwachindunji popanda kutenga gawo losakwanira lapakati logwiritsa ntchito mpweya wotentha. Kutentha kotereku pakutentha ndi nthawi yowuma kumachepetsedwa mpaka mphindi 8.5 mpaka 20 kutengera momwe ntchito ikugwiritsidwira ntchito, pomwe maola angapo amayenera kuwerengedwera pamakina anthawi zonse a mpweya wotentha kapena wowuma.

Kuyanika kwa infrared kumatha kusintha kwambiri magwiridwe antchito a twin-screw extruder chifukwa kumachepetsa kuwonongeka kwa ma IV ndikuwongolera kwambiri kukhazikika kwa njira yonse.