Qee Cov Ntaub Ntawv ntawm Elongation ntawm So ntawm PE Pipes

Elongation thaum so yog ib qho tseem ceeb ntawm cov cuab yeej siv los ntsuas cov khoom muaj peev xwm rau cov yas deformation thaum raug tensile quab yuam kom txog thaum tsis ua hauj lwm. Nws yog txhais raws li tag nrho elongation ntawm lub ntsuas qhov ntev ntawm lub sijhawm tawg, qhia raws li feem pua ​​​​ntawm qhov ntsuas qhov ntev. Qhov kev ntsuas no ncaj qha qhia txog cov khoom siv toughness thiab ductility; tus nqi siab dua qhia tias deformability ntau dua ua ntej tsis ua hauj lwm thiab kev ua haujlwm zoo dua rau kev cuam tshuam thiab deformation, qhov qis dua tus nqi txhais tau hais tias cov khoom siv nkig ntau ua rau tawg tawg.

Elongation ntawm tawg ntawm PE Pipes
Lub elongation ntawm kev tawg ntawm PE kav dej yog ib qho tseem ceeb qhia rau kev ntsuam xyuas qhov yooj ntawm cov kav dej. Kev ntsuam xyuas cov cuab yeej no tso cai rau kev ntsuam xyuas seb cov yeeb nkab zoo puas tau raws li cov qauv kev cai. Kev ntsuam xyuas yog ua raws li ISO 6259-3 ("Thermoplastics kav - Kev txiav txim siab ntawm tensile zog") ntawm qhov kub thiab txias ntawm 23 degrees. Kev ntsuam xyuas tensile yog ua raws li qhov ceev ceev uas siv lub tshuab ntsuas tensile los txiav txim siab qhov siab tshaj plaws elongation ntawm kev so rau PE cov kav dej (Ntau dua lossis sib npaug li 350%)

Test Principple:
Elongation thaum so feem ntau yog ntsuas los ntawm ib qhohluav taws xob tensile kuaj tshuab. Thaum lub sij hawm qhov kev xeem, tus qauv npaj yog clamped ntawm ob qho kawg nyob rau hauv lub tshuab grips, thiab ib tug tensile load yog siv nyob rau hauv ib tug tas li tus nqi. Lub tshuab ib txhij sau cov ntaub ntawv thauj khoom thiab hloov chaw los ua kom muaj kev ntxhov siab -strain nkhaus. Thaum cov qauv ruptures, lub kaw lus cia li kaw qhov ntsuas qhov ntev ntawm lub sijhawm tawg. elongation ntawm break yog xam los ntawm kev faib qhov sib txawv ntawm tus ncej - break gauge length thiab tus thawj gauge ntev los ntawm tus thawj gauge ntev.
Specimen Classification: Cov khoom siv sib txawv siv cov qauv me me los xyuas kom meej qhov sib piv ntawm cov txiaj ntsig kev xeem. Rau PE piping, dumbbell- cov qauv zoo li yog feem ntau siv, feem ntau muaj qhov ntsuas qhov ntev ntawm 50 mm lossis 100 mm los pab txhawm rau clamping thiab ntsuas.

Qhov tseem ceeb ntawm Kev Ntsuas Elongation ntawm So rau PE Pipes
elongation ntawm kev tawg yog qhov taw qhia tseem ceeb ntawm PE yeeb nkab qhov yooj yim thiab tsis kam mus deformation; nws feem ntau yog nyob ntawm yam xws li cov khoom siv, qib, additives, molecular qauv, thiab kev tsim khoom. Feem ntau, cov kav dej PE ua los ntawm cov ntaub ntawv zoo li siab - ntom polyethylene (HDPE) thiab linear low-density polyethylene (LLDPE) muaj peev xwm ua tau zoo ntawm cov yas deformation, uas ua rau muaj kev elongation ntau dua ntawm cov nqi tawg.

Hauv kev siv tswv yim, qhov elongation ntawm kev tawg rau PE kav feem ntau yog li ntawm 500% mus rau 1000%, txhais tau hais tias cov yeeb nkab ntev tuaj yeem nce tsib - mus rau kaum -fold ua ntej fracturing hauv nro. Qhov siab elongation ntawm kev tawg ua rau PE cov kav dej zoo tiv thaiv kev cuam tshuam sab nraud, deformation, thiab hloov chaw, yog li pab txo qis kev pheej hmoo ntawm kev tawg thiab txhim kho cov yeeb nkab kom ruaj khov.

Kev Txhim Kho Kev Txhim Kho Kev Tsim Kho rau Tsis yog -Cov Kev Ntsuas Cov Qauv Ua Tau Zoo
Yog tias cov qhabnias xeem poob qis dua qhov yuav tsum tau ua (piv txwv li,<350%), troubleshooting and improvements can be addressed in the following areas:
1. Cov teeb meem raw khoom
Ua rau: Kev siv ntau dhau ntawm cov khoom siv rov ua dua lossis rov ua dua tshiab; melt flow index (MFI) ntawm raw cov ntaub ntawv tsawg dhau los yog siab dhau.
Kev txhim kho:
Xyuas kom siv cov khoom tsim nyog PE resin (xws li PE80, PE100).
Tswj qhov kev faib ua feem ntawm regrind ntxiv (feem ntau tsis tshaj 10%, kom ntseeg tau tias kev ua haujlwm ruaj khov).
Xaiv cov qib uas tsim nyog cov dej ntws ntsuas (feem ntau 0.2–1.0 g / 10 min).

2. Kev ua haujlwm tsis raug
Ua rau: Kub extrusion ntau dhau ua rau thermal degradation; txias txias ua rau muaj kev ntxhov siab sab hauv; ntau dhau ntsia hlau shear.
Kev txhim kho:
Tsawg extrusion kub: Tshwj xeeb, txo cov chim thiab tuag kub, xyuas kom lawv tsis pub tshaj 220-230℃(nyob ntawm seb cov qib tshwj xeeb).
Optimize ntsia hlau ceev: Tsis txhob ntau shear uas yuav ua rau lub zos overheating.
Kho tus nqi cua txias: Ua kom maj mam ua kom txias txias kom tsis txhob quenching sai (piv txwv li, los ntawm kev nce cov dej txias los yog txo qhov ntev ntawm qhov txias txias).

3. Cov teeb meem kev tsim thiab cov khoom ntxiv
Ua rau: Tsis txaus lossis tsis muaj txiaj ntsig antioxidants; uneven carbon dub dispersion; cov ntsiab lus filler ntau dhau.
Kev txhim kho:
Ua kom ntau npaum li cas los yog hloov mus rau siab -kev ua haujlwm antioxidants (piv txwv li, 1010/168 systems).
Xyuas kom meej meej dispersion ntawm carbon dub masterbatch thiab tswj cov ntsiab lus nyob rau hauv 2.0% -2.5% ntau.
Tsis txhob ntxiv cov khoom uas tsis yog -functional fillers (piv txwv li, calcium carbonate, talc).

4. Tuag thiab Extrusion Kab Tsim
Ua rau: Tsis tiav melting los yog muaj cov kab weld; tsis haum compression ratio.
Kev txhim kho:
Txhim kho cov ntsia hlau sib tov muaj peev xwm (piv txwv li, los ntawm kev siv cov ntsia hlau barrier).
Optimize qhov tuag ntws channel tsim kom ntseeg tau tias cov yaj yaj extrusion.

5. Tshaj tawm -kev ua haujlwm thiab Cia
Ua rau: Tsis ua haujlwm annealing tom qab extrusion; raug UV hluav taws xob los yog ya raws thaum khaws cia.
Kev txhim kho:
Ua kev tshaj tawm -txheej txheem extrusion (xws li tuav cov yeeb nkab hauv 80-90℃dej da dej lossis qhov cub rau ob peb teev, ua raws li qhov txias txias) kom txo tau cov kev ntxhov siab sab hauv.
Khaws rau hauv qhov chaw txias, qhuav kom deb ntawm lub teeb; zam qhov ntev sab nraum zoov raug tshav ntuj.

Hauv cov ntsiab lus, covelongation ntawm tawg ntawm PE yeeb nkabyog ib qho tseem ceeb ntawm cov cuab yeej cuab tam; Nws qhia txog cov khoom siv deformability ntawm qhov taw tes ntawm tensile tsis ua haujlwm thiab yog qhov tseem ceeb rau kev ua kom ntseeg tau thiab ua haujlwm ntev ntawm PE kav hauv kev siv tswv yim. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias qhov tseem ceeb rau elongation ntawm kev tawg yuav txawv nyob ntawm cov khoom siv; Yog li ntawd, cov xwm txheej no yuav tsum raug coj mus rau hauv tus account thaum xaiv cov khoom siv thiab tsim engineering.