What is a single screw barrel?

It is one screw rotating inside a heated cylindrical barrel that conveys, melts and pumps plastic through a die. The screw has feed, compression and metering zones, and its L/D ratio, compression ratio and flight design determine melting quality and output.

What L/D ratio do I need?

Longer L/D gives more residence time for melting, mixing and venting, so PE and PP film lines often run longer screws. Heat-sensitive materials such as rigid PVC use shorter L/D to limit shear. Match it to your polymer and target output.

What is compression ratio on a single screw?

It is the feed-zone channel volume divided by the metering-zone volume, commonly around 2.5:1 to 4:1. Too low leaves material under-melted; too high generates excess shear heat and can degrade shear-sensitive polymers.

What is a barrier screw and when do I need one?

A barrier screw adds a secondary flight through the transition zone that separates unmelted solids from melt, giving faster and more complete melting. It is commonly used on high-speed PE and PP lines where output and melt uniformity both matter.

Single screw or twin screw — which do I need?

Choose single screw for high-output extrusion of uniform pellet feedstock: film blowing, pipe from pellets, sheet and granulation. Choose twin screw when you need strong mixing, effective venting, powder feeding or high filler content.

Which single screw barrel is best for film blowing?

For LDPE and HDPE film, a longer L/D with a barrier or mixing section gives the melt uniformity that film thickness control depends on. Clean virgin resin normally runs well on a nitrided surface.

Should a single screw barrel be nitrided or bimetallic?

Clean virgin resin can run nitrided, with a nitriding hardness of HV 900–1100 and 0.5–0.8 mm depth. Filled, recycled or PVC compounds should be bimetallic, where a 2.0–3.0 mm alloy layer at HRC 56–65 resists abrasion and corrosion far longer.

How do I know my single screw is worn out?

The usual signs are falling output, unstable pressure, longer heat-up, poorer melt quality and rising motor load. Measuring screw-to-barrel clearance against spec is the clearest way to confirm wear before it costs you product.

Ib qho Screw chim: L / D, Ntsia Hlau Hom & Yuav Ua Li Cas Xaiv los ntawm Polymer

2026-08-13 0 Tso lus rau kuv

Los ntawmNanhaiya Technical Team— Ntsia Hlau & Barrel Engineering, Zhoushan · Tshuaj xyuas rau lub Hoobkas raug · ~ 9 min nyeem

Teb ceev

Ib lub taub hau ib lub taub hau yog ib lub hau ntswj rotating nyob rau hauv ib lub cylindrical chim, conveying, melting thiab pumping yas los ntawm ib tug tuag. Kev ua tau zoo yog tsim los ntawm peb yam: L / D ratio, compression ratio thiab ntsia hlau hom (tus qauv, barrier lossis sib tov). Nws yog qhov kev xaiv pheej yig tshaj plaws rau kev tso tawm siab extrusion ntawm cov khoom sib xws - zaj duab xis tshuab, yeeb nkab los ntawm pellets, ntawv thiab granulation.

Covib lub taub hau taub hauyog cov khoom siv plasticizing feem ntau hauv cov yas extrusion - yooj yim dua, pheej yig dua thiab muaj peev xwm ua tau zoo heev thaum cov khoom siv twb tsis sib xws. Tab sis "yooj yim" tsis txhais hais tias ib qho me me haum rau txhua qhov: ib qho ntsia hlau thiab lub thoob rau LDPE zaj duab xis tshuab zoo li tsis muaj dab tsi zoo li ib qho rau cov yeeb nkab PVC lossis rau PP high-speed. Cov lus qhia no suav nrog cov lus qhia tshwj xeeb uas txiav txim siab ua tau zoo, hom ntsia hlau uas koj tuaj yeem xaiv los ntawm, thiab yuav ua li cas kom phim ib tus ntsia hlau extruder chim rau koj lub polymer.

Single screw extruder and barrel manufactured by Nanhaiya

Yuav ua li cas ib tug ntsia hlau chim

Cov khoom nkag mus rau hauv lub caj pas pub, yog rub rau pem hauv ntej los ntawm cov ntsia hlau tig, thiab melts los ntawm kev sib xyaw ntawm lub thoob kub thiab cov shear generated ntawm cov ntsia hlau davhlau thiab lub thoob phab ntsa. Cov ntsia hlau tau muab faib ua peb thaj chaw ua haujlwm, thiab kev hloov pauv ntawm lawv yog qhov zoo ntawm cov ntsia hlau tsim tau zoo:

Pub cheeb tsam- sib sib zog nqus ya dav hlau xa cov khoom pellets rau pem hauv ntej thiab pib ua ntej cua sov rau lawv. Pub kev ua tau zoo nyob ntawm kev sib txhuam, yog li grooved feed seem yog siv qhov twg yuav tsum tau yuam kom (siab-tso PE thiab PP kab).
Compression (kev hloov pauv) cheeb tsam- Davhlau qhov tob tob zuj zus mus, compacting cov khoom, squeezing tawm cua ntxiab thiab melting nws los ntawm tshav kub thiab shear.
Kev ntsuas cheeb tsam- ntiav, qhov dav dav tsis tu ncua qhov tob homogenises yaj thiab tsim kom muaj lub siab ruaj khov kom cov zis los ntawm qhov tuag nyob twj ywm.

Vim hais tias ib lub hau ntswj ib leeg tso siab rau kev khiav khiav es tsis yog qhov zoo, nws cov zis tawm tau rhiab rau kev sib txhuam, lub taub hau siab thiab cov khoom siv ntau ntom ntom - uas yog vim li cas cov ntsia hlau tsim thiab kev tshem tawm tseem ceeb heev rau cov khoom siv tiag tiag.

L / D ratio thiab compression ratio

Ob tus lej no piav qhia feem ntau ntawm qhov ib qho ntsia hlau thiab lub thoob yuav ua li cas:

Spec	Nws txhais li cas	Vim li cas thiaj tseem ceeb
L/D ratio	Cov ntsia hlau ntev ntev muab faib los ntawm txoj kab uas hla (piv txwv li 25: 1, 30: 1, 33: 1)	Ntev L/D = ntau lub sij hawm nyob = zoo melting, mixing thiab venting; luv L / D suits cov khoom siv thaum tshav kub kub
Compression ratio	Pub-zone channel ntim ÷ metering-zone channel ntim (piv txwv li 2.5: 1-4: 1)	Tsawg dhau lawm thiab cov khoom tsis yog-melted; siab dhau lawm thiab koj overheat los yog degrade shear-sensitive polymers
Ntsia hlau txoj kab uas hla	Nominal ntsia hlau loj nyob rau hauv mm	Teem lub tso zis band thiab yuav tsum phim koj extruder raws nraim
Ntsia Hlau / chim clearance	Qhov sib txawv ntawm lub davhlau ya nyob twg thiab bore phab ntsa	Qhib li cov ntsia hlau hnav - tso zis thiab siab poob raws li nws ua
Zone layout	Ntev sib cais ntawm pub / compression / metering	Tuned rau polymer lub melting cwj pwm
Ua siab ntev	Machining precision ntawm qhov tiav	Nanhaiya tuav ib lub taub hau rau ± 0.001 hli nrog ncaj ntawm 0.015 hli / m

General kev lag luam ceeb toom:Raws li cov lus qhia ntxhib, tawv PVC feem ntau khiav qis dua qhov sib piv thiab luv L / D kom txwv shear ntawm lub tshav kub-rhiab polymer, thaum PE thiab PP zaj duab xis kab khiav ntev L / D nrog ib qho barrier los yog sib tov seem rau yaj uniformity. Ib txwm lees paub tawm tsam koj lub tshuab thiab kev tsim qauv.

Standard, barrier thiab mixing screws

Lub davhlau geometry yog qhov twg ib lub taub hau ntsia hlau tiag tiag tau teev tseg:

Standard (paub) ntsia hlau- ib lub davhlau, peb cheeb tsam. Economy thiab txhim khu kev qha rau cov ntaub ntawv ncaj qha thiab nruab nrab cov zis.
Barrier ntsia hlau- lub davhlau thib ob cais cov khib nyiab uas tsis tau yaj los ntawm yaj los ntawm kev hloov pauv, muab nrawm dua, ua tiav ntau dua thiab cov zis ruaj khov dua. Feem ntau ntawm high-speed PE thiab PP kab.
Sib tov ntsia hlau- Ntxiv ib qho kev sib xyaw (Maddock, pineapple lossis tus pin hom) nyob ze rau qhov kawg txhawm rau txhim kho cov xim sib txawv thiab xim dispersion.
Vented (ob theem) ntsia hlau- thaj chaw decompression nyob rau hauv qhov chaw nres nkoj tso cai rau cov dej noo thiab cov volatiles khiav hauv nruab nrab lub thoob, pab tau rau hygroscopic lossis cov khoom siv rov ua dua.
Grooved feed chim- axial grooves nyob rau hauv seem pub quab yuam kom tsawg thiab nqa tawm ntawm kev siv PE / PP high-speed.

Single screw pelletizing line for plastic granulation — Ib qho ntsia hlau pelletizing kab - granulation yog ib qho ntawm cov haujlwm feem ntau ntawm cov ntsia hlau.

Yuav ua li cas xaiv los ntawm polymer

Lub polymer, tsis yog lub tshuab hom, yuav tsum tsav cov specification. Lub tswv yim pib matrix:

Khoom siv / txoj haujlwm	Ntsia hlau mus kom ze	Kev kho saum npoo
LDPE / HDPE zaj duab xis tshuab tshuab	Ntev L / D, barrier los yog sib tov seem rau yaj uniformity	Nitrided feem ntau yog txaus rau cov resin huv
PE / PP kev kub ceev extrusion	Barrier ntsia hlau, feem ntau nrog grooved pub rau yuam kom noj	Nitrided; bimetallic yog sau los yog siv dua
Rigid PVC yeeb nkab	Tsawg compression, maj mam shear los tiv thaiv tshav kub-sensitive PVC	Bimetallic - PVC yog abrasive nrog muab tub lim thiab corrosive
PS ua npuas ncauj	Tswj melt kub thiab ruaj khov siab rau cell qauv	Nitrided los yog bimetallic los ntawm qib muab tub lim
Granulation / pelletizing	Zoo homogenization; vented ntsia hlau yog tias cov khoom noj muaj noo noo	Bimetallic rau cov khoom ntim puv lossis rov ua dua tshiab
Filled lossis recycled compounds	Kev tsim muaj zog nrog qhov cua	Bimetallic / tungsten-carbide - abrasion yog qhov txwv

Dab tsi ib lub taub hau taub hau siv rau

Zaj duab xis tshuab- LDPE, HDPE thiab LLDPE ntim zaj duab xis.
Cov yeeb nkab & profile los ntawm pellets- suav nrog PE yeeb nkab thiab PVC yeeb nkab kab.
Sheet & vaj huam sib luag extrusion- cov ntaub ntawv tiaj tus thiab cov khoom siv board.
Granulation & pelletizing— saib pebib leeg ntsia hlau pelletizing kab.
Hlau & cable- rwb thaiv tsev thiab tsho extrusion.
Lab & me-batch ua haujlwm— saibmini ib leeg ntsia hlau extruder.

Ib leeg ntsia hlau vs ntxaib ntsia hlau

Kev xaiv ntawm ib lub taub hau ib lub taub hau thiab ib lub taub hau ntxaib los ntawm cov khoom xav tau ntawm nws txoj kev mus rau qhov tuag.

Qhov xwm txheej	Ib lub taub hau taub hau	Twin ntsia hlau chim
Kev xa tawm	Drag flow - nyob ntawm kev sib txhuam	Zoo, intermeshing hloov
Sib tov	Txwv (txhim kho nrog ntu thaiv / sib xyaw)	Muaj zog dispersive thiab distributive mixing
Hmoov noj	Kev tawm tsam nrog tsawg qhov ntom ntom	Kov hmoov zoo, tshwj xeeb tshaj yog nrog yuam feeder
Nqi & simplicity	Tus nqi qis dua, kev saib xyuas yooj yim dua	Tus nqi siab dua, configurable ntau dua
Zoo tshaj rau	Zaj duab xis tshuab, yeeb nkab los ntawm pellets, ntawv, granulation	PVC ncaj extrusion, compounding, siab muab tub lim

Yog tias koj cov khoom noj khoom haus yog ib qho pellet zoo li qub thiab koj xav tau cov khoom tsim tawm ib duas, ib qho ntsia hlau yeej. Yog tias koj xav tau kev sib xyaw, qhov cua lossis hmoov tuav, saib ntawm pebconicallos yogthaum uas tig mus ntxaib ntsia hlauntau yam hloov.

Khoom siv thiab kev kho deg

Ib lub taub hau ib lub taub hau yog ib qho hnav, thiab ntev npaum li cas nws tuav spec los ntawm cov hlau thiab nto. Nanhaiya tshuab ib leeg ntsia hlau thiab cov thoob los ntawm 38CrMoAlA nitrided steel, W6Mo5Cr4V2 lossis HIP hmoov hlau, thiab ua tiav lawv mus rau qhov chaw roughness ntawm Ra0.4.

Parameter	Tus nqi
Cov khoom siv hauv paus	38CrMoAlA (tseem W6Mo5Cr4V2, HIP hmoov hlau)
Tempering hardness	HB 260–290
Nitriding hardness	HWV 900–1100
Nitriding qhov tob	0.5-0.8 hli
Bimetallic hardness	HRC 56–65 (peb txheej txheej tungsten ntxiv mus txog 62 HRC vs ib qho 58 HRC)
Bimetallic qhov tob	2.0-3.0 hli
Nto roughness	Rau 0.4
Kev ncaj	0.015 hli / m

Rau cov dej huv huv xws li nkauj xwb LDPE, nitriding feem ntau yog txaus. Rau kev ua haujlwm puv, rov ua dua lossis PVC, qhov chaw bimetallic yog qhov hloov kho kom pom tseeb - saib peb qhov kev sib piv ntawmbimetallic vs nitrided ntsia hlau chim.

Yuav ua li cas thiaj txiav txim siab ib leeg ntsia hlau chim

Tshuab cov ntsiab lus- extruder hom thiab qauv, los yog ib daim duab nrog lub taub hau taub hau, ntev ntev, pub-caj pas thiab flange qhov ntev.
Polymer & formulation- hom resin ntxiv rau cov muab tub lim, iav fiber ntau lossis cov ntsiab lus rov ua dua tshiab.
Lub hom phiaj tso zis- kg / h thiab kab nrawm, yog li L / D thiab ntsia hlau hom haum rau txoj haujlwm.
Paub teeb meem- yog tias cov ntsia hlau tam sim no surges, under-melts los yog hnav ceev, qhia rau peb; uas feem ntau taw qhia rau qhov kev hloov tsim koj xav tau.

Nrog rau cov khoom siv plaub no peb tuaj yeem qhia meej meej-haum ib qho ntsia hlau thiab lub thoob - lossis muab nws ua ib feem ntawm pebkhoom seemntau - thiab hais lus hauv 12 teev. Standard-type screws nkoj los ntawm Tshuag hauv 24-48 teev; customized qhov chaw khiav ib lub voj voog 30-40 hnub.

Cov lus nug uas nquag nug

Ib lub taub hau taub hau yog dab tsi?

Nws yog ib lub hau ntswj rotating nyob rau hauv ib tug rhuab cylindrical chim uas conveys, melts thiab twj yas los ntawm ib tug tuag. Cov ntsia hlau muaj pub, compression thiab metering zones, thiab nws cov L / D ratio, compression ratio thiab davhlau tsim txiav txim siab melting zoo thiab cov zis.

Dab tsi L / D piv kuv xav tau?

Ntev L/D muab sij hawm nyob ntau dua rau melting, sib tov thiab venting, yog li PE thiab PP zaj duab xis kab feem ntau khiav ntev screws. Thaum tshav kub kub-rhiab heev cov ntaub ntawv xws li tawv PVC siv luv luv L / D los txwv shear. Muab nws rau koj cov khoom siv polymer thiab lub hom phiaj tso zis.

Dab tsi yog compression ratio ntawm ib lub hau ntswj?

Nws yog qhov pub-zone ntim ntim faib los ntawm qhov ntsuas-zone ntim, feem ntau nyob ib ncig ntawm 2.5: 1 txog 4: 1. Tsawg heev nplooj cov ntaub ntawv nyob rau hauv-melted; siab dhau ua rau cov cua sov ntau dhau thiab tuaj yeem degrade shear-sensitive polymers.

Lub barrier ntsia hlau yog dab tsi thiab thaum twg kuv xav tau ib qho?

Ib qho kev thaiv cov ntsia hlau ntxiv ib qho kev sib tw thib ob los ntawm thaj chaw hloov pauv uas cais cov khib nyiab uas tsis tau yaj los ntawm yaj, ua kom nrawm dua thiab ua tiav ntau dua. Nws yog feem ntau siv rau high-speed PE thiab PP kab uas tso zis thiab yaj uniformity ob qho tib si.

Ib leeg ntsia hlau lossis ntxaib ntsia hlau - uas kuv xav tau?

Xaiv ib qho ntsia hlau rau cov khoom siv siab extrusion ntawm cov khoom siv pellet: zaj duab xis tshuab, yeeb nkab los ntawm pellets, ntawv thiab granulation. Xaiv cov ntsia hlau ntxaib thaum koj xav tau kev sib tov muaj zog, ua kom muaj cua zoo, noj hmoov los yog cov ntsiab lus siab.

Qhov twg ib lub taub hau taub hau yog qhov zoo tshaj plaws rau zaj duab xis tshuab?

Rau LDPE thiab HDPE zaj duab xis, ntev L / D nrog ib qho kev thaiv lossis qhov sib xyaw muab cov yaj sib xws uas cov yeeb yaj kiab thickness tswj nyob ntawm. Kev huv huv cov ntaub so ntswg ib txwm ua haujlwm zoo ntawm qhov chaw nitrided.

Yuav tsum ib lub taub hau taub hau yog nitrided los yog bimetallic?

Cov pob zeb dawb huv huv tuaj yeem khiav nitrided, nrog rau nitriding hardness ntawm HV 900-1100 thiab 0.5-0.8 hli qhov tob. Sau, rov ua dua lossis PVC cov khoom sib txuas yuav tsum yog bimetallic, qhov twg 2.0-3.0 mm alloy txheej ntawm HRC 56-65 tiv taus kev puas tsuaj thiab corrosion ntev dua.

Yuav ua li cas kuv thiaj paub tias kuv ib leeg ntsia hlau raug puas lawm?

Cov paib ib txwm yog cov khoom poob qis, tsis ruaj khov siab, ua kom sov ntev dua, tsis zoo melting zoo thiab nce lub cev muaj zog load. Ntsuas ntsia hlau-rau- chim tshem tawm tawm tsam spec yog qhov tseeb tshaj plaws kom paub meej tias hnav ua ntej nws raug nqi koj cov khoom.

Cov khoom lag luam cuam tshuam los ntawm peb lub Hoobkas

Ib leeg ntsia hlau Extruder

Ib Screw Pelletizing Kab

Mini Ib Ntsia Hlau Extruder

Twin Ntsia Hlau Extruder

PVC Board Conical Twin Ntsia Hlau Barrel

Parallel Twin Ntsia Hlau Pelletizing Kab

Tau ib lub taub hau ntsia hlau sib phim rau koj txoj kab

Xa peb koj tus qauv extruder lossis kos duab, koj cov resin thiab koj lub hom phiaj tso zis - peb cov engineers yuav qhia txog L / D, ntsia hlau hom thiab kho qhov chaw uas haum rau txoj haujlwm. Standard screws nkoj hauv 24-48 teev; kev cai qhov chaw khiav 30-40 hnub.

Tau txais cov lus hais hauv 12 teev →

Nanhaiya (Zhoushan) Yas Machinery · 500+ cov neeg siv khoom thoob ntiaj teb ·ib leeg, conical & thaum uas tig musntsia hlau chim &khoom seem