Qhov Txawv Zoo Tshaj Plaws ntawm Lub Tshuab Pab Pa ntau dua ntawm PA66: Kawg rau kev Sib Tso tseg ntawm Lub Network ntawm Daim Duab Daim Duab
Nyob hauv cheeb tsam ntawm PA66, tshwj tsis yog rau kev tsim kho kho uas xav tau kev pab cuam ntawm daim duab (GF), qhov kev xaiv ntawm lub tshuab pab pa ntau dua yog qhov tseem ceeb rau kev sib tso tseg zoo ntawm daim duab thiab qhov txawv ntawm lub pa ntau dua. Txhawm rau single screw extruders muaj qhov tseem ceeb nyob rau cov ntaub ntawv yooj yim thiab kev daws teeb meem ntau, lub twin screw extruders muaj qhov txawv tshaj plaws los pab tau rau kev sib tso tseg zoo ntawm daim duab hauv daim duab network—qhov txawv no yuav tsis tuaj yeem txav mus rau lwm qhov thaum pab tsim PA66 zoo tshaj.
Qhov Tseem Ceeb ntawm Kev Sau Lub Tshuab: Qhov Chaw Tseem Ceeb rau Kev Sib Tso tseg ntawm Lub Network ntawm Daim Duab
Qhov txawv tseem ceeb ntawm single screw thiab twin screw extruders yog nyob rau hauv qhov kev sau ntawm lub screw, uas tsim nyog rau kev sib pab nrog daim duab.
- Cov cuab yeej siv ib qhov roj teeb tshuab siv ib qhov roj teeb roj teeb, qhov chaw siv tshuab siv tshuab thiab siv tshuab ntau tshaj plaws nyob rau hauv qhov chaw siv tshuab, qhov chaw siv tshuab, thiab qhov chaw siv tshuab. qhov kev sib txawv no, ib qhov kev sib txawv sib txawv: cov roj sib txawv feem ntau yuav tsum tau ntxiv rau hauv qhov chaw siv tshuab lossis tshav kub vim qhov kev sib txawv siab, tsis tuaj yeem tsim ib qhov kev sib txawv.
- Lub roj teeb twb npau rwb, nyob rau hauv kev pib txwv, muaj ob qhov npau rwb sib tshuam uas rov ceev nyob rau hauv lub hnab xeeb (corotating) lossis tib neeg taw tes. Qhov kev tsim no ua zauv li "kev lag luam kev sib thooj"—cov npau rwb tsis yog ib txwm tso kom muaj zog tab sis tseem tshuam ntau qhov chaw, tshuam thiab tshuam cov cuab yeej. Cov qhov chaw tshuam sab nraud ntawm cov npau rwb tshem cov duab ntaub ntoo ntoo tshem tawm, thaum lub roj teeb tshuam tsim tawm cov duab ntaub ntau ntau tshaj rau hauv PA66 matrix, tsim tau lub thawj chaw tshwj xeeb. Lub network no yog qhov tseemceeb rau kev txhim kho zog, kev nyab xeeb kub thiab kev raug zoo ntawm lub granules.
Siv raws li tus leejtwg 2023 los ntawm Polymer Processing Report, lub roj teeb twb npau rwb diminution glass fiber clumping rates los ntawm dua 70% kom rau single screw models, thiab fiber dispersion uniformity txog 95%—qhov tseemceeb rau kev tsim cov fiber network.
Kev Lag Luam Tshuaj Xyuas Zaj Tib Num: Saib xyuas Fiber Integrity rau kev tsim Network
PA66 granulation nrog lub rooj saib xyaw yuav tsum muaj kev raug zoo ntawm ob qhov txheej txheem tseemceeb: sau hauv plua pluas (kom muab kev pab cuam tseeb) thiab sib tshooj zoo (kom tsim cov network). Lub twister screw extruders zoo dua ob qho no los ntawm kev kho kom meej meej nyob rau hauv teb thiab kev ntxuav.
Kev Nyob Zoo ntawm Teb: Tsis Txhob Kev Puav tsoob ntawm Lub Roog saib xyaw thiab Lub Matrix
PA66 muaj qhov kev xav tau tseem ceeb rau teb—teb ntawm kev them yuav tsum yog sau nrog 260–270°C, vim tias yog tshaj 285°C yuav ua rau khoom puav tsoob, uas yuav tshwm sim kev sib txuas tsis zoo ntawm lub rooj saib xyaw thiab lub matrix.
- Lub single screw extruders muaj teeb meem ntawm kev nyob hlo tawg ±8°C thaum siv, uas tshwm sim "hot spots" uas ua rau PA66 puav tsoob thiab sib txuas yaj npaum ntawm lub rooj saib xyaw. Qhov no tsis yog ib qhov uas tshwm sim kev tsis sib tshooj, tab sis kuj ua rau performance ntawm lub granule ci ci.
- Twin screw extruders txhawb roj teeb meem nruab nrab hauv ±3°C (thiab zoo li ±1.5°C nyob rau qhov tshua tshaj tshiab), raws li raug tso cai los ntawm Vajvoos Npeev ntawm Advanced Polymers xyoo 2022. Qhov tsim kho tshuab barrel thiab kev sib txuas heat zoo tiv thaiv PA66 matrix thiab kab ntsuab los ntawm kev puav tswg. Qhov chaw nyob no zoo ib yam rau kev tsim kab ntsuab-thaub pib, tshwj tsis txaus siab rau kev tsim kab ntsuab.
Kev Tswj Shear: Txhawb Kab Ntsuab Nyob Thaum Kev Sib Chud
Daim kab ntsuab ntev yog tshwj tsis txaus rau kev tsim kab ntsuab—daim kab ntsuab luv tsis tuaj yeem tsim kev sib sau, thaum daim kab ntsuab ntev dua feem ntau yuav cuam tshwm.
- Single screw extruders tsim kev sib thooj unidirectional, thiab tsim kev puav tswg kab ntsuab tshaj 18% thaum kab ntsuab ntau txog 30%. Kab ntsuab puav yuav luv heev, tsis tuaj yeem tsim kev sib sau ib yam, ua rau kev tsim kho tshuab tsis zoo.
- Twin screw extruders ua hauj kev zoo dua nrog kev sib txig tshuab nrog kev them ntxiv ntawm kev sib txig:
- Kneading blocks txeem ntau dua li 40%, tshem tawm cov agglomerates tsis txhob muaj kev tshem ntau dua li yam xav tau;
- Reverse screw components txeem kev tso tawm tshuab txeem tawm ntau dua los ntawm kev tswj kev rov qab ntawm vajtim, txeem ntau dua kev tshem tawm ntawm kev tshem tawm;
- Variable flight depth txeem kev tso tawm tshuab txeem tawm (±2 MPa) txhua qhov, txeem kev sib txig tshuab txeem tawm.
Cov kev sim tsoom tias twin screw extruders txeem kev tshem tawm ntawm glass fiber txog tsawg dua li 5% hauv qhov chaw muaj 40% glass fiber. Cov kev tshem tawm (feem ntau yog 0.2–0.5 mm) txeem kev sib txig tshuab txeem tawm hauv PA66 matrix, tsim cov kev sib txig tshuab txeem tawm uas txeem kev tso tawm tshuab txeem tawm, kev tso tawm tshuab txeem tawm, thiab kev tso tawm tshuab txeem tawm ntawm cov granules.
Kev sib txig thiab Plasticizing Performance: Txeem kev sib txig tshuab txeem tawm
Kev zoo siab ntawm kev tsim khoob ntoo sib txuas nyob ntawm qhov tswj hauv lub extruder los pab PA66 thiab khoob ntoo sib sau ua ke raws li ib qho chaw uas twin screw extruders zoo dua single screw rau kev tsim khoom granulation.
Txwv Yeeb Kev Lim Hauv Single Screw Rau Kev Siv Siv Ntau
Single screw extruders nyuaj siab nrog PA66 siv ntau (xws li, ≥30% zawg ntoo) vim muaj kev sau ua ke tsis zoo. Qhov chaw sib txuas tsis zoo txog 15% tuaj yeem tsim qhov sib txuas khoob ntoo tsis zoo: ib qho chaw muaj ntau khoob ntoo heev (tsim qhov tsha tshaj), thaum ib qho chaw ntxiv tsawg (ntsim qhov ceev). Tom qab no, qhov sib txuas tsis zoo tuaj yeem tsim 5% polymer phom, uas tso caij ntxiv kom khoob ntoo thiab matrix interface tsis zoo, thiab tso caij tsis tau tsim khoob ntoo sib txuas.
Twin Screw Muaj Qhov Tsob Loj Sib Txuas: Txuas Rau Kev Sib Txuas Khoob Ntoo
Twin screw extruders muaj qhov tsob sib txuas uas tuaj yeem tsim rau kev tsim khoom PA66 siv khoob ntoo:
- Cov khoom sib txuam kev sib chaws (xws li cov kab ntxwv) tshem qhreib ntawm cov kab roj mus rau ib qho chav;
- Cov khoom sib txuam kev faib cov kab roj tshwj tsis zoo rau hauv qab chaw, thim suav txhua tus kheej muaj cov chav sib txuam zoo ib yam;
- Qhov tswj yeem sau kab roj hlau rau qhov chaw tshwj xws (hauv plhawb) tuaj yeem txo qhov sib npaug thiab qhov tso caij ncaj ncees, txhim kho qhov ntev thiab nyob intact;
Kev tsim no tshwm sim PA66 cov kheej uas muaj cov chav sib txuam zoo, uas muaj kev txhim kho nyob rau hniag siab los ntawm 30–50% thiab flexural modulus los ntawm 40–60% hn compared to single screw-produced granules, raws AMI Consulting’s 2023 research.
Kev Pab Txhim Kho Thiab Qhov Zoo ntawm Cov Kheej
Rau PA66 granulation meej-em-to-high (50–200 tons/yeej), twin screw extruders pab txhim kho kev pab cuam thiab kev sib txuam zoo, txo qhov tsis txaus thiab pab txhim kho kev nyob zoo.
Thaum Twg Tsis Muaj Ntau Kab Roj
- Qhov tsim tsev ntim ib qhov chaw tso tseg tuaj yeem hnov qab 30–40% thaum siv 30% sib txig kab ntim PA66, vim qhov khoom siv zog siab tso caij rau kev sib dhos.
- Qhov tsim tsev ntim ob qhov chaw tso tseg tuaj yeem tswj ywm kev siv zog nyob rau 25–35 kg/hr tsis xav txog qhov ntau ntawm kab, nyob rau hauv qhov kev sib dhos meej thiab kev faib ntau. Qhov sib xws no pab kom kab ntim muaj qhov sib xws txhua hnub, kom tsis txhob muaj kev hlo li cas los.
Kev sib xws hauv qhov ntev thiab kev ua haujlwm
Qhov sib xws ntawm kab ntim yog qhov tshwm sim ntawm qhov tseeb ntawm kab ntim:
- Qhov tsim tsev ntim ob qhov chaw tso tseg tuaj yeem tswj ywm qhov hlo li cas ntawm kab ntim hauv ±2%, kom rau ob qhov ib qhov chaw tso tseg uas muaj ±12%.
- Qhov ntev ntawm qhov ntim (ntawm lub hnub kawg) yog ±0.07 mm, kom txhua kab ntim muaj qhov sib xws hauv qhov ntim.
Nyob rau hauv kev tsim kho 24-teev thaum kawg, tus ntsuas tsheb twj sib thooj ntawm lub tshuab txhuam me me (±1.5°C) thiab kev saj ntsuas tshav tso (45–50 MPa) tiv thaiv kev puav tsaws lossis kev faus tsis zoo, txo cov khoom tsis raug los ntawm 5–7% kom compared to single screw systems.
Kev suav koj plua plav thiab nyiaj: Ntseeg xyuas nyiaj hauv kev tsim kho khoom zoo
Thiab hais tias lub tshuab twj sib thooj xeev yuav tsum tau ntau dua 30–50% nyiaj xa mus ua ntej kom compared to single screw models, tab sis lawv muaj feem phim zoo dua hauv kev faus tshuaj nkag rau hauv PA66 granulation, tshwj tsis yog rau daim ntawv kho khoom uas muaj ntau fiber (≥25% glass fiber):
Txo cov khoom siv tsis txaus
Lub tshuab twj sib thooj txo cov khoom siv tsis txaus los ntawm 8–12% los ntawm kev rho qhov fiber clumping, kev puav tsaws khoom, thiab khoom tsis zoo. Rau ib chaw tsim kho uas tsim kho 150 tons/tus xyoo ntawm PA66 granules uas muaj ntau fiber, no txhais tau tias 12–18 tons ntawm cov khoom tsav dav tau cia li cas li cas ib xyoo.
Kev thaub siab nyiaj thiab kev saj ntsuas
- Twin screw extruders siv 18–22% tsawg dua lub zog rau ib kilogram ntawm PA66 muaj ntau fiber dua li single screw, vim muaj kev sib txuas thiab sib ntxiv zoo dua.
- Txhawm rau kev kho tshuaj txhua xyoo ntau dua 40% (vim kev siv hlo tawm los ntawm cov hluv hlau muaj kab ntsug), tab sis kev txo tus nqi los ntawm kev txo cov nqi tsis xis thiab kev pab tso cov granule zoo dua tuaj yeem kom kom muaj kev nyab xeeb—tshpecially rau cov kev siv xoom tseem ceeb (ntsim thermal break strips, cov ntsiab lus siv rau lub motorkho, cov chaw nyob rau hauv electronics).
Kev nyob ib ncig hauv kev lag luam
Cov granule uas muaj cov hluv hlau sib txuas zoo ib yam feem ntau yuav muaj qhov ntau dua hauv kev lag luam vim lawv muaj qhov zoo hauv kev ua haujlwm thiab kev tshwm sim. Cov granule uas tsim los ntawm twin screw tuaj yeem dhau qhov kev cai tseem ceeb rau cov kev siv xoom tseem ceeb, pab rau cov neeg tsim khoom tau nkag mus rau cov chaw muag khoom uas muaj kev pheej hmong uas single screw tsis tau.
Qhov lus pom: Twin Screw Extruders—Qhov kev xaiv zoo tshaj rau kev tsim PA66 granule zoo
Rau PA66 granulation, tshaj tawm thaum cov roj zaum sib txuas zoo li glass fiber yog xav tau, qhov kev pab cuam meej ntawm tus ntxig twister rau kev sib xyaw cov roj zaum hluv hluv mus rau hauv qhov chaw sib piv txwv yog ib qhov tshwm sim loj. Lub kauj ruam tshoj, kev kho kom meej meej ntawm teeb li cas / kev rub, thiab kev tsim kho tshiab tshiab txuas ntxiv txuas ntxiv tau nyob hauv qhov chaw tseem ceeb ntawm txhua lub voj voog muaj kev sib txawv, kev ua haujlwm zoo dua—ntawm qhov uas single screw extruders tsis tuaj yeem pib. Thaum qhov lag luam pib yog siab dua, qhov kev pab tshaj plaws dhau los ntawm kev khiav kho, zoo li, thiab kev sib tw hauv mercado yog qhov tw twg rau kev tsim khoom PA66 granules zoo dua. Yuav no yuav rau thermal break strip raw materials, cov khoom siv rau yeej tshwj xeeb, lossis lwm yam kev siv khoom xav tau siab dua, qhov network ntawm glass fiber uas tsim los ntawm twin screw extrusion muab cov voj voog uas txwv tsis pub tshwm sim hauv zog, kev nyob ncig, thiab kev nyob ruaj.
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