PE yeeb nkab thiab PPR yeeb nkab yog ob yam khoom siv rau cov kav dej, thiab ob qho tib si siv tau rau cov dej. Yog li vim li cas cov kav dej txhim kho hauv tsev feem ntau xaiv PPR cov kav dej, thaum cov kav dej PE feem ntau yog siv rau cov kav dej hauv nroog, thiab tsis tshua siv rau kev txhim kho cov kav dej hauv tsev? Cov laj thawj yog raws li nram no:
Ua ntej, lub elastic modulus, uas cuam tshuam rau qhov nruj thiab yooj ntawm cov yeeb nkab
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 yooj yog qhov zoo, tab sis qhov tawv tsis txaus; PE cov yeeb nkab dej yog siv rau kev tsim cov dej hauv thaj chaw, qhov ncaj ntawm cov kav dej tsis zoo, nws yooj yim khoov, yooj yim deform, thiab cov kav dej tsis zoo nkauj. Txawm li cas los xij, nyob rau hauv thaj chaw ntawm cov dej hauv nroog, vim muaj qhov nyuaj ntawm qhov chaw, cov kav dej yuav tsum muaj qhov hloov tau zoo 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 vim lawv qhov tawv tawv zoo, tsis yooj yim, thiab qhov kub tsis tshua muaj siab.
Thib ob, kev tiv thaiv tshav kub, 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. Txawm li cas los xij, raws li cov ntaub ntawv, qhov kub-tiv taus ntawm cov pa PE kav yog 60 degree, thiab qhov kub ntawm cov dej hauv tsev yuav nyob ib puag ncig 50 degree. Thaum lub sijhawm ua haujlwm, kev laus ceev ntawm PE yeeb nkab 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 kev txhim kho tsev.
Thib peb, thermal conductivity, uas cuam tshuam rau 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 npaug. Peb paub tias qhov qis dua thermal conductivity, qhov zoo dua thermal rwb thaiv tsev ntawm cov yeeb nkab dej. Yog tias PE yeeb nkab siv hauv pem teb cua sov, nws yuav muab tag nrho kev ua si rau nws qhov zoo. Cov cua kub zoo txhais tau hais tias cov hluav taws xob hluav taws xob zoo dua qub, tab sis thaum siv cov kav dej kub, nws dhau los ua nws qhov tsis zoo. Yog tias cua sov dissipation zoo, qhov kub poob yuav loj heev. Qhov kub thiab txias ntawm cov yeeb nkab kuj tseem siab dua, thiab nws yooj yim rau kub. Raws li kev txhim kho dej hauv tsev, pom tseeb PE yeeb nkab tsis tsim nyog li PPR yeeb nkab.
Plaub, vuam kev ua tau zoo, 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 vuam tshwj xeeb rau PPR cov kav dej ntawm lub tshuab feem ntau ua rau cov vuam ntau dhau, ua rau cov dej xau. 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. Qhov no kuj yog siv cov kav dej PPR rau kev kho kom zoo nkauj hauv tsev es tsis txhob siv PE. Ib qho laj thawj tseem ceeb heev rau lub raj.
