Kev sib xyaw ua ke ntawm biopolymer ntawm cov extruders twin-screw: plaub yam koj yuav tsum paub

Muaj ntau tus neeg ua si thoob ntiaj teb tshiab tau tshwm sim hauv kev lag luam biopolymer, siv cov ntaub ntawv tshiab thiab ntau cov qauv tshiab.Twin Ntsia Hlau Extrudermuab cov peev xwm sib xyaw ua ke zoo heev rau txhua yam polymers, suav nrog biopolymers. Txawm hais tias cov mis tshuaj yog dab tsi los xij, koj yuav tsum xav txog koj tus neeg muab khoom siv ua tus khub koom tes txhim kho kom ua tiav koj lub hom phiaj hauv kev yaj thiab extrusion zoo, kev tsim khoom thiab lwm yam. Xyuas kom tseeb tias koj tus neeg muab khoom siv muaj cov chaw thiab kev txawj ntse los pab koj sim koj cov mis tshuaj thiab txhim kho koj cov txheej txheem.

Ib yam li txhua qhov project extrusion, yuav tsum muaj kev sim ua ntau zaus hauv kev tsim cov biopolymer tshiab. Qee qhov ua tiav txij thaum pib; lwm tus yuav tsum tau ua haujlwm ntau dua ua ntej lawv tuaj yeem muag tau.
Lub peev xwm tsim cov khoom siv bioplastics thoob ntiaj teb yuav nce mus txog 4.8 billion phaus los ntawm xyoo 2024, ua tsaug rau cov chaw tsim khoom siv extrusion thiab cov tswv lag luam hloov pauv lawv txoj kev xav mus rau cov ntaub ntawv "ntsuab". Yog tias koj tab tom nrhiav kev muab cov tshuaj sib xyaw kom tau raws li qhov kev thov no, ntawm no yog qee qhov kev txiav txim siab tseem ceeb uas koj yuav tsum paub.

Yuav ib lub extruder nrog kev hloov kho tau zoo dua
Muaj ntau lub tshuab extruders uas tau tsim los kom yooj ywm heev. Koj tuaj yeem yuav cov extruders ntev nrog 48: 1 lossis 52: 1 L / D, lawv muaj ntau qhov chaw tso pa tawm thiab cov kev xaiv qhov chaw pub.

Vim tias cov yas uas lwj tau yog ib qho kev lag luam uas hloov pauv sai, cov tswv yim tshiab, cov khoom siv tshiab lossis zoo dua, cov khoom ntxiv thiab lwm yam feem ntau raug qhia. Nws yooj yim dua los qhib lossis kaw cov qhov chaw tso pa tawm, lossis ntxiv lossis tshem tawm cov khoom noj sab ntawm cov chaw muaj, dua li yuav cov thoob tshiab tom qab kev yuav khoom thawj zaug lossis nthuav lub extruder.

Nco ntsoov tias cov biopolymers feem ntau yog hygroscopic
Npaj kom muaj tsawg kawg ib lub qhov cua uas nkag tau rau hauv huab cua (qee zaum ob lub) thiab tsawg kawg ib lub qhov cua nqus tsev (qee zaum ob lub). Cov biopolymers feem ntau yog hygroscopic thiab yuav tsum tau ua tib zoo ua ntej ua tiav. Kev tso lub qhov cua thaum ntxov hauv cov txheej txheem extrusion yog qhov zoo los txo qhov hydrolysis ntawm biopolymer thiab kom tsis txhob qhuav ua ntej ntawm cov khoom.
Kev siv lub tshuab nqus tsev yog qhov tseem ceeb. Tsis txhob xav tias lub tshuab nqus tsev yog ib qho khoom siv ntxiv uas tsis tseem ceeb, nws yog ib feem tseem ceeb ntawm cov txheej txheem extrusion thiab feem ntau yog qhov sib txawv ntawm kev ua cov khoom zoo lossis tsis zoo. Cov tshuab nqus tsev uas tsim los zoo kuj daws qhov teeb meem ntawm cov khoom biopolymer volatiles uas feem ntau corrosive, uas tuaj yeem them rau lawv tus kheej los ntawm kev txo qis kev saib xyuas thiab lub sijhawm tsis ua haujlwm thiab ua kom muaj txiaj ntsig ntau dua.

Biopolymers muaj kev rhiab heev rau shear thiab pressure
Cov biopolymers lwj sai sai thaum raug cua sov thiab/lossis raug txiav ntau dhau. Qhov raug txiav ntawm cov khoom siv yog sib npaug ncaj qha rau qhov ceev ntawm lub extruder ntsia hlau thiab sib npaug rov qab rau qhov sib txawv ntawm qhov sib txawv ntawm lub extruder ntsia hlau thiab lub thoob. Rau qhov muab throughput rate, khiav lub extruder ntawm qhov ceev qis tshaj plaws kom txog thaum lub extruder torque siab dhau (> 90%) lossis ncav cuag qhov txwv ntim, uas yog txhais los ntawm cov tshuaj uas txhawb nqa qhov pub lossis qhov chaw tso pa tawm.

Kev txwv qhov ntim tuaj yeem zam tau los ntawm kev tso lub qhov cua kom cua thiab dej noo tawm thiab los ntawm kev tso lub pob txwv lossis lub hau ntswj rov qab mus rau sab qis ntawm qhov pub lossis qhov cua li sai tau. Kev tiv thaiv torque siab tuaj yeem zam tau los ntawm kev tsim lub hau ntswj extruder kom muaj thaj chaw sib tov ntev, "mos mos" es tsis yog thaj chaw sib tov luv luv, muaj zog. Kev ruaj khov ntawm lub feeder kom txo qis kev hloov pauv torque tso cai rau tus neeg teb xov tooj khiav lub extruder ntawm qhov nruab nrab torque siab dua.

Qhov sib hloov pauvntxaib-ntsia hlau extruder, txawm hais tias lub tshuab sib tov zoo thiab ua haujlwm tau zoo, tsuas yog 8 txog 15 feem pua ​​​​​​ua haujlwm tau zoo li lub twj tso kua mis, uas txhais tau tias qhov siab ntawm lub extruder tuaj yeem ua rau qhov kub ntawm yaj nce ntxiv. Qhov siab ntawm lub qhov hluav taws xob kuj tseem tuaj yeem ua rau cov dej ntws tawm ntawm qhov chaw tso pa tawm ze ntawm qhov hluav taws xob extruder.

Ua kom lub qhov taub ntawm lub taub hau tuag loj dua, ua kom lub lim dej loj dua thiab, thaum ua pelletizing hauv dej, ua kom dej thiab lub taub hau tuag kub dua, txhua yam no txo ​​qhov siab ntawm lub extruder. Cov khoom siv threaded nrog lub suab xa khoom sib npaug rau ib txoj kab uas hla yog cov khoom siv twj tso kua mis zoo tshaj plaws.

Siv tau lub twj tso kua yaj ntawm qhov tawm ntawm lub extruder thiab lub taub hau tuag. Lub zog twj ntawm lub twj tso kua yaj yog nruab nrab ntawm 25% thiab 35%. Kev siv lub twj tso kua yaj txo qhov kub ntawm cov yaj nce, txuag lub zog extruder thiab tsim cov dej ntws tawm zoo dua. Tus nqi ntawm lub twj tso kua yaj qee zaum tuaj yeem ua pov thawj tau yooj yim los ntawm kev nce cov zis ntawm extruder.

Cov biopolymers lwj sai sai, yog li kev tshem tawm cov pa phem yog qhov tseem ceeb
Cov biopolymers lwj sai dua li feem ntau cov roj av polymers. Yog tias lub extruder yuav tsum tau tso rau ntau tshaj 1 txog 2 teev, nws raug pom zoo kom txo qhov cua sov ntawm lub thoob lossis tua nws.
Yog tias lub extruder yuav tsum tau ua kom sov rau lub sijhawm ntev yam tsis tau khiav lub extruder, ntxuav lub extruder nrog cov polymer pheej yig uas ruaj khov thaum tshav kub kub nrog cov viscosity yaj siab dua li ntawm bio-resin. Yog tias cov viscosity ntawm cov khoom ntxuav siab dhau, nws yuav tshwm sim ua cov khoom tsis huv hauv ob peb teev tom qab rov pib dua.