Cov Khoom Raw Dab Tsi, Zoo li Polyethylene (PE), Puas Siv Hauv Lub Tshuab Ua Npuas Ncauj EPE Thiab Puas Muaj Cov Cai Tshwj Xeeb? - Epe ua npuas ncauj tshuab

Kev tsim cov txheej txheem ntawm Expanded Polyethylene (EPE) ua npuas ncauj pib nrog nws cov khoom tseem ceeb, thiab qhov zoo ntawm cov khoom kawg yog intrinsically txuas rau qhov zoo ntawm cov khoom siv raw. Rau ibEPE ua npuas ncauj tshuab ua haujlwm tau zoo thiab ua tau zoo - zoo, ua npuas ncauj zoo ib yam, cov ntaub ntawv nkag yuav tsum ua raws li cov lus qhia meej. Cov khoom siv tseem ceeb yog Low-Density Polyethylene (LDPE) resin, tab sis qhov no tsis siv rau kev sib cais. Cov txheej txheem yuav tsum tau ua tib zoo tsim cov ntsiab lus uas suav nrog tus neeg sawv cev tshuab thiab lwm yam khoom ntxiv. Kev ua haujlwm ntawm lubEPE ua npuas ncauj tshuab-nrog rau nws qhov ruaj khov, qhov tso zis tawm, thiab lub cev lub zog ntawm cov npuas dej uas nws tsim tawm - yog nyob ntawm cov yam ntxwv ntawm LDPE resin thiab purity ntawm cov tshuaj nrog rau. Kev siv cov khoom siv tsis raug lossis tsis raug tuaj yeem ua rau muaj kev ua txhaum cai, lub sijhawm ua haujlwm ntawm lub tshuab, thiab cov khoom tiav uas tsis ua raws li cov qauv kev tiv thaiv.

Lub hauv paus tseem ceeb raw khoom yogTsawg-Density Polyethylene (LDPE) cob, feem ntau nyob rau hauv daim ntawv ntawm me me pellets. LDPE siv nyob rau hauv ibEPE ua npuas ncauj tshuabYuav tsum muaj qhov tshwj xeeb melt flow index (MFI). MFI ntsuas cov viscosity ntawm cov yas yaj. Ib qho MFI uas qis dhau qhia tau hais tias cov resin uas hnyav dhau thiab yuav nyuaj rau covEPE ua npuas ncauj tshuabua kom du, uas yuav ua rau lub tshuab strain thiab inconsistent foaming. Conversely, MFI uas siab dhau txhais tau hais tias cov resin yog kua heev thaum yaj, uas tuaj yeem ua rau cov qauv ua npuas ncauj tsis zoo thiab tsis muaj zog hauv cov khoom kawg. Tsis tas li ntawd, cov resin yuav tsum muaj siab purity thiab zoo ib yam molecular hnyav faib los xyuas kom meej zoo melting thiab expansion nyob rau hauv lub extruder chim ntawm lub extruder.EPE ua npuas ncauj tshuab. Cov kab mob sib kis los yog cov khoom siv tsis sib xws tuaj yeem ua rau txhaws hauv lub taub hau tuag thiab ua rau ua npuas dej nrog cov pob tsis muaj zog lossis voids.

Txawm li cas los xij, LDPE pellets ib leeg tsis tuaj yeem tsim ua npuas ncauj. Qhov thib ob tseem ceeb tivthaiv yog lubtshuab tshuab. Hauv kev tsim khoom niaj hnub no, cov tshuab tshuab lub cev xws li liquefied lossis compressed butane lossis carbon dioxide feem ntau yog siv. Cov neeg sawv cev no tau txhaj rau hauv qhov siab siab rau hauv LDPE molten hauv lubEPE ua npuas ncauj tshuab. Thaum cov khoom raug extruded los ntawm qhov tuag, qhov poob siab sai ua rau tus neeg sawv cev tshuab kom nthuav dav, tsim qhov kaw - cell foam qauv uas characterizes EPE. Qhov purity thiab meej dosing ntawm tus neeg sawv cev tshuab yog qhov tseem ceeb. Cov impurities tuaj yeem ua rau cov npuas dej tsis zoo, thiab kev siv tshuaj tsis raug yuav ua rau ua npuas dej uas tuab dhau los yog tsis yooj yim. Ib qho tseem ceeb thib peb yog ibnucleating tus neeg sawv cev, xws li calcium carbonate lossis citric acid ntsev. Qhov no additive muab qhov chaw rau lub tshuab ua npuas ncauj rau daim ntawv, kom muaj ib tug zoo, uniform cell qauv thoob plaws hauv lub npuas. Kev sib xyaw ua ke ntawm cov ntaub ntawv no, tswj los ntawm kev tswj cov txheej txheem ntawm cov txheej txheemEPE ua npuas ncauj tshuab, yog dab tsi txiav txim siab ua npuas ncauj qhov kawg ntom ntom, yooj, thiab cushioning kev ua tau zoo.

Hauv kev xaus, cov khoom siv raw rau ib qhoEPE ua npuas ncauj tshuabyog ib feem ntawm daim ntawv qhia tshuaj muaj tseeb. LDPE resin yuav tsum muaj qhov tseeb melt flow Performance index thiab siab purity, thaum lub tshuab tshuab thiab nucleating cov neeg ua hauj lwm yuav tsum yog cov qib tshwj xeeb thiab sib xyaw hauv cov proportions. Lub efficiency ntawm lubEPE ua npuas ncauj tshuabyog tag nrho nyob ntawm qhov sib xws thiab qhov zoo ntawm cov khoom siv no. Yog li ntawd, kev yuav khoom los ntawm cov neeg muag khoom txhim khu kev qha uas nkag siab txog cov kev xav tau ntawm kev ua npuas ncauj extrusion tsis yog ib qho kev pom zoo xwb tab sis yog qhov tsim nyog rau kev ua haujlwm tau zoo thiab muaj txiaj ntsig. Lub tshuab thiab cov ntaub ntawv tsim ib qho kev sib koom ua ke uas qhov zoo ntawm ib qho dictates qhov kev ua tau zoo ntawm lwm tus.