PE yeeb nkab thiab PPR yeeb nkab yog ob hom yeeb nkab. Qhov sib txawv ntawm cov yeeb nkab PVC siv rau cov dej ntws, ob qho tib si PE yeeb nkab thiab PPR yeeb nkab tuaj yeem siv rau kev siv dej. Tab sis nyob rau hauv lub neej tiag tiag, feem ntau yog ib tug PPR dej yeeb nkab, yog vim li cas rau qhov no? Nws yog txiav txim siab los ntawm cov yam ntxwv hauv qab no.
1. Modulus ntawm elasticity: cuam tshuam cov yeeb nkab txhav thiab yooj
Cov khoom siv ntawm PPR dej yeeb nkab yog polypropylene, elastic modulus yog 850MPa, rigidity yog zoo, thiab qhov yooj yog tsis txaus; Thaum lub PE cov yeeb nkab dej yog ua los ntawm nruab nrab ntom polyethylene, lub elastic modulus tsuas yog hais txog 550MPa, thiab qhov hloov tau zoo, tab sis qhov tawv tsis txaus. Nyob rau hauv lub tshav pob ntawm cov dej hauv nroog, vim yog qhov nyuaj ntawm ib puag ncig, cov kav dej yuav tsum muaj qhov yooj yim los tiv thaiv kev cuam tshuam, yog li PE yeeb nkab yog qhov tsim nyog rau thaj chaw ntawm cov dej hauv nroog. Hauv qhov sib piv, PPR cov kav dej yog qhov tsim nyog rau kev tsim cov dej hauv tsev vim lawv qhov tawv tawv zoo, tsis yooj yim, thiab qhov kub tsis tshua muaj siab.
2. Thaum tshav kub kub tsis kam: cuam tshuam rau kev nyab xeeb ntawm cov kav dej
Txawm hais tias PE yeeb nkab muaj qhov ua tau zoo ntawm qhov kub thiab txias, nws qhov kev ua haujlwm kub tsis zoo li PPR dej yeeb nkab. Hauv kev tsim cov dej hauv tsev, tshwj xeeb tshaj yog kev kho kom zoo nkauj hauv tsev, yuav tsum siv cov kav dej kub. Qhov kub-tiv taus ntawm cov pa PE kav yog 60 degree, thiab cov pa kub ntawm cov dej hauv tsev yuav nyob ib ncig ntawm 50 degree. Kev ua haujlwm ntev ntawm qhov kub no yuav ua rau cov kav dej PE muaj hnub nyoog. Qhov ceev yuav nrawm heev, tsis txhob hais tias qhov kub zoo yuav siab dua 50 degree, yog li PE yeeb nkab tsis haum rau kev thauj mus los ntawm cov dej kub, uas yog ib qho laj thawj vim li cas nws feem ntau tsis siv rau hauv tsev. kev txhim kho.
3. Thermal conductivity: cuam tshuam cov thermal rwb thaiv tsev kev ua tau zoo ntawm cov kav dej
Lub thermal conductivity ntawm PPR dej yeeb nkab yog {{0}}.24, thiab thermal conductivity ntawm PE dej yeeb nkab yog 0.42, uas yog ze li ntawm ob zaug siab. Qhov qis dua thermal conductivity, qhov zoo dua thermal rwb thaiv tsev kev ua tau zoo ntawm cov kav dej. Yog tias PE yeeb nkab siv hauv pem teb cua sov, nws yuav muab tag nrho cov kev ua si rau nws qhov zoo. Kev ua kom sov zoo txhais tau hais tias cov hluav taws xob hluav taws xob hluav taws xob kuj zoo dua. Txawm li cas los xij, thaum siv cov kav dej kub, nws dhau los ua nws qhov tsis zoo. Qhov kub kuj tseem siab dua, thiab nws yooj yim rau hlawv. Raws li kev txhim kho dej hauv tsev, pom tseeb PE yeeb nkab tsis tsim nyog li PPR yeeb nkab.
4. Kev ua haujlwm vuam: cuam tshuam qhov nyuaj ntawm kev tsim cov kav dej
Nyob rau hauv cov nqe lus ntawm vuam kev ua tau zoo, lub flanging ntawm PPR dej yeeb nkab yog puag ncig, thaum lub flanging ntawm PE dej yeeb nkab yog irregular, uas yog ib qho yooj yim los thaiv; Tsis tas li ntawd, qhov vuam kub ntawm PE yeeb nkab thiab PPR yeeb nkab yog sib txawv, PPR yeeb nkab dej yog 260 degree, thiab PE yeeb nkab dej yog 230 degree. Lub tshuab tshwj xeeb vuam rau PPR cov kav dej ntawm lub tshuab feem ntau ua rau cov vuam ntau dhau, ua rau cov dej ntws tawm. Ntxiv mus, vim tias cov khoom siv PE yooj yim rau oxidize, cov cuab yeej tshwj xeeb yuav tsum tau siv los txhuam cov oxide ntawm daim tawv nqaij ntawm qhov chaw ua ntej vuam, txwv tsis pub, lub raj xa dej tsis tuaj yeem tsim tau tiag tiag, thiab cov raj xa dej tuaj yeem ua rau cov dej xau. Nws tuaj yeem pom tau tias txawm hais tias ob qho tib si PPR cov kav dej thiab PE cov kav dej tuaj yeem raug welded los ntawm cov cua sov fusion, lawv tsis nyob rau tib theem ntawm cov txheej txheem kev ua haujlwm nyuaj. PPR cov kav dej tau yooj yim rau kev khiav lag luam thiab yooj yim dua los tsim.
Ua ke nrog cov ntsiab lus saum toj no, PPR yeeb nkab tau dhau los ua cov khoom siv yeeb nkab ntau tshaj plaws hauv kev txhim kho tsev. Yog xav paub ntxiv txog PPR yeeb nkab fittings, thov nias ua rawsIFAN.
