{"id":1048,"date":"2025-12-12T01:01:28","date_gmt":"2025-12-12T01:01:28","guid":{"rendered":"https:\/\/www.materialstests.com\/?p=1048"},"modified":"2025-12-12T01:01:31","modified_gmt":"2025-12-12T01:01:31","slug":"how-to-measure-melt-flow-index-and-why-is-mfi-tester-important","status":"publish","type":"post","link":"https:\/\/www.materialstests.com\/sk\/resources\/how-to-measure-melt-flow-index-and-why-is-mfi-tester-important.html","title":{"rendered":"Ako mera\u0165 index toku taveniny a pre\u010do je d\u00f4le\u017eit\u00fd tester MFI?"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>Ako mera\u0165 index toku taveniny a pre\u010do je d\u00f4le\u017eit\u00fd tester MFI?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny (MFI) je miera hmotnosti polym\u00e9ru, ktor\u00fd prete\u010die kapil\u00e1rou pri stanovenej teplote a tlaku po\u010das meran\u00e9ho \u010dasov\u00e9ho obdobia. Index toku taveniny sa zvy\u010dajne pou\u017e\u00edva na meranie r\u00fdchlosti toku taveniny (MFR) polym\u00e9ru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny (MFI) je teda \u0161tandardizovan\u00e1 miera hmotnosti polym\u00e9ru, ktor\u00fd prete\u010die kapil\u00e1rou za ur\u010dit\u00fd \u010das. Index toku taveniny je mierou r\u00fdchlosti toku roztaven\u00e9ho polym\u00e9ru a be\u017ene sa pou\u017e\u00edva na hodnotenie kvality d\u00e1vky polym\u00e9ru.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Prietok taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00fdchlos\u0165 toku taveniny (MFR) je hmotnos\u0165 polym\u00e9ru, ktor\u00e1 prete\u010die po\u010das sk\u00fa\u0161ky za ur\u010dit\u00fd \u010das. R\u00fdchlos\u0165 toku taveniny je mierou jednoduchosti spracovania polym\u00e9ru taveninou. R\u00fdchlos\u0165 toku taveniny mo\u017eno mera\u0165 pomocou testera indexu toku taveniny.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tester indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Str\u00e1nka&nbsp;<strong>Tester indexu toku taveniny<\/strong>&nbsp;pozost\u00e1va z vytl\u00e1\u010dacieho zariadenia, lisu a motora. S\u00faprava motora poh\u00e1\u0148a skrutku, ktor\u00e1 poh\u00e1\u0148a polym\u00e9r cez matricu. Ve\u013ekos\u0165 otvoru lisu ur\u010duje r\u00fdchlos\u0165, akou polym\u00e9r pr\u00fadi. Roztaven\u00fd polym\u00e9r vych\u00e1dzaj\u00faci z lisu pad\u00e1 na v\u00e1\u017eiacu plo\u0161inu, kde sa zaznamen\u00e1va hmotnos\u0165 polym\u00e9ru v priebehu \u010dasu. Zo zaznamenan\u00fdch \u00fadajov sa potom vypo\u010d\u00edta r\u00fdchlos\u0165 toku taveniny. Index toku taveniny je u\u017eito\u010dn\u00fd na kontrolu kvality a ur\u010denie podmienok spracovania polym\u00e9rov. Pou\u017e\u00edva sa aj na porovn\u00e1vanie r\u00f4znych polym\u00e9rov z h\u013eadiska ich vhodnosti na pou\u017eitie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>V\u00fdznam PFI<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tester na meranie indexu toku taveniny sa pou\u017e\u00edva na meranie indexu toku taveniny a mo\u017eno ho n\u00e1js\u0165 v mnoh\u00fdch laborat\u00f3ri\u00e1ch a zariadeniach na kontrolu kvality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny m\u00f4\u017ee by\u0165 ovplyvnen\u00fd mnoh\u00fdmi faktormi, napr\u00edklad typom polym\u00e9ru, molekulovou hmotnos\u0165ou polym\u00e9ru, nastaveniami testera indexu toku taveniny a podmienkami prostredia po\u010das testovania. Index toku taveniny je d\u00f4le\u017eit\u00fdm meradlom kvality polym\u00e9ru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tester MFI mo\u017eno pou\u017ei\u0165 na rie\u0161enie probl\u00e9mov s v\u00fdrobnou \u0161ar\u017eou alebo na monitorovanie zmien v zlo\u017een\u00ed polym\u00e9rov.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ako bolo uveden\u00e9 vy\u0161\u0161ie, index toku taveniny (MFI) je miera hmotnosti polym\u00e9ru, ktor\u00fd pretek\u00e1 kapil\u00e1rou pri stanovenej teplote a tlaku po\u010das meran\u00e9ho \u010dasov\u00e9ho obdobia. Na meranie indexu toku taveniny polym\u00e9ru sa m\u00f4\u017ee pou\u017ei\u0165 tester indexu toku taveniny.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je d\u00f4le\u017eit\u00e1 vlastnos\u0165, preto\u017ee s\u00favis\u00ed s viskozitou polym\u00e9ru, ktor\u00e1 n\u00e1sledne ovplyv\u0148uje spracovanie polym\u00e9ru.  Index toku taveniny sa teda m\u00f4\u017ee pou\u017ei\u0165 na optimaliz\u00e1ciu podmienok spracovania polym\u00e9rov. Ke\u010f\u017ee index toku taveniny je tie\u017e ukazovate\u013eom viskozity polym\u00e9ru, mo\u017eno ho pou\u017ei\u0165 na korel\u00e1ciu pri \u0161t\u00fadiu vlastnost\u00ed polym\u00e9ru. Ako vieme, viskozita je schopnos\u0165 roztaven\u00e9ho materi\u00e1lu pr\u00fadi\u0165 pod tlakom. Index toku taveniny materi\u00e1lu je nepriamo \u00famern\u00fd viskozite.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Okrem toho sa index toku taveniny m\u00f4\u017ee pou\u017ei\u0165 na klasifik\u00e1ciu polym\u00e9rov a v\u00fdber vhodn\u00fdch polym\u00e9rov pre konkr\u00e9tne aplik\u00e1cie. Index toku taveniny je d\u00f4le\u017eitou vlastnos\u0165ou z mnoh\u00fdch d\u00f4vodov a mal by sa mera\u0165, ak je to mo\u017en\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI sa m\u00f4\u017ee pou\u017ei\u0165 aj na porovnanie distrib\u00facie molekulovej hmotnosti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI tak m\u00f4\u017ee s\u00favisie\u0165 s r\u00f4znymi vlastnos\u0165ami polym\u00e9ru, ako je molekulov\u00e1 hmotnos\u0165, viskozita a hmotnostn\u00e9 rozlo\u017eenie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>K\u013e\u00fa\u010dov\u00e9 body pre PFI<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u010c\u00edm vy\u0161\u0161\u00ed je index toku taveniny polym\u00e9ru, t\u00fdm ni\u017e\u0161ia je jeho molekulov\u00e1 hmotnos\u0165.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI je nepriamo \u00famern\u00e1 viskozite polym\u00e9ru<strong>.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hodnoty indexu toku taveniny jedn\u00e9ho materi\u00e1lu pri r\u00f4znych gravimetrick\u00fdch hmotnostiach sa m\u00f4\u017eu pou\u017ei\u0165 na meranie distrib\u00facie molekulovej hmotnosti testovan\u00e9ho polym\u00e9ru.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MFI a molekulov\u00e1 hmotnos\u0165 polym\u00e9ru<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je test, ktor\u00fd sa pou\u017e\u00edva na ur\u010denie priemernej molekulovej hmotnosti termoplastick\u00e9ho polym\u00e9ru. Test indexu toku taveniny sa vykon\u00e1va zahriat\u00edm vzorky polym\u00e9ru na ur\u010dit\u00fa teplotu a meran\u00edm \u010dasu, za ktor\u00fd polym\u00e9r prete\u010die mal\u00fdm otvorom. Index toku taveniny je nepriamo \u00famern\u00fd priemernej molekulovej hmotnosti polym\u00e9ru; preto vysok\u00fd index toku taveniny znamen\u00e1 n\u00edzku priemern\u00fa molekulov\u00fa hmotnos\u0165, zatia\u013e \u010do n\u00edzky index toku taveniny znamen\u00e1 vysok\u00fa priemern\u00fa molekulov\u00fa hmotnos\u0165. Index toku taveniny sa be\u017ene pou\u017e\u00edva ako meradlo kontroly kvality plastov, preto\u017ee priamo s\u00favis\u00ed s fyzik\u00e1lnymi a syntetick\u00fdmi vlastnos\u0165ami plastu. Vysok\u00fd index toku taveniny znamen\u00e1, \u017ee plast je dobrej kvality a je vhodn\u00fd na pou\u017eitie, zatia\u013e \u010do n\u00edzky index toku taveniny znamen\u00e1, \u017ee plast je nekvalitn\u00fd a nie je vhodn\u00fd na pou\u017eitie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Met\u00f3da testovania indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MFI je miera jednoduchosti, s akou sa termoplastick\u00fd polym\u00e9r tav\u00ed a te\u010die. Hodnota indexu toku taveniny sa odvodzuje z r\u00fdchlosti vytl\u00e1\u010dania roztaven\u00e9ho polym\u00e9ru cez lisovaciu formu za predp\u00edsan\u00fdch podmienok teploty, za\u0165a\u017eenia a priemeru otvoru. Index toku taveniny sa vyjadruje ako hmotnos\u0165 polym\u00e9ru v gramoch, ktor\u00fd vytek\u00e1 cez lisovaciu formu za desa\u0165 min\u00fat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sk\u00fa\u0161ka indexu toku taveniny sa vykon\u00e1va vlo\u017een\u00edm vzorky do testera indexu toku taveniny pri teplote vy\u0161\u0161ej, ako je jej teplota topenia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zariadenie Melt Flow Indexer sa sklad\u00e1 z elektricky vyhrievanej vonkaj\u0161ej z\u00f3ny a vn\u00fatornej matrice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vzorka sa vlo\u017e\u00ed do vn\u00fatornej matrice a nech\u00e1 sa nieko\u013eko min\u00fat \u00faplne roztavi\u0165.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Potom sa zapne ukazovate\u013e toku taveniny a skrutkovac\u00ed razn\u00edk sa za\u010dne pohybova\u0165 nadol kon\u0161tantnou r\u00fdchlos\u0165ou, \u010d\u00edm vytla\u010d\u00ed roztaven\u00fd polym\u00e9r cez otvor na dne matrice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prietok taveniny sa vypo\u010d\u00edta na z\u00e1klade \u010dasu potrebn\u00e9ho na vytekanie 10 g polym\u00e9ru cez matricu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00fdchlos\u0165 toku taveniny sa m\u00f4\u017ee pou\u017ei\u0165 na predpovedanie viacer\u00fdch vlastnost\u00ed materi\u00e1lu, ako je spr\u00e1vanie pri spracovan\u00ed, dlhodob\u00e9 viskoelastick\u00e9 spr\u00e1vanie, stabilita po\u010das kone\u010dn\u00e9ho pou\u017eitia at\u010f. Je preto d\u00f4le\u017eit\u00fdm parametrom kontroly kvality mnoh\u00fdch polym\u00e9rov a plastov\u00fdch materi\u00e1lov.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sk\u00fa\u0161ka indexu toku taveniny sa teda vykon\u00e1va s cie\u013eom pos\u00fadi\u0165 vhodnos\u0165 plastov\u00e9ho granul\u00e1tu na aplik\u00e1ciu na z\u00e1klade jeho indexu toku taveniny. .&nbsp;<strong>V\u00fdsledky testu indexu toku taveniny<\/strong>&nbsp;analyzuje oddelenie kontroly kvality s cie\u013eom rozhodn\u00fa\u0165, \u010di je testovan\u00e1 vzorka vhodn\u00e1 na pou\u017eitie. Sk\u00fa\u0161ka indexu toku taveniny je d\u00f4le\u017eit\u00fdm n\u00e1strojom na ur\u010denie vhodnosti termoplastick\u00e9ho materi\u00e1lu na aplik\u00e1ciu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>V\u00fdhody testovania indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Testovanie indexu toku taveniny je be\u017en\u00e1 met\u00f3da pou\u017e\u00edvan\u00e1 na hodnotenie tokov\u00fdch vlastnost\u00ed termoplastu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je mierou \u013eahkosti toku materi\u00e1lu a ur\u010duje sa meran\u00edm r\u00fdchlosti vytl\u00e1\u010dania roztaven\u00e9ho polym\u00e9ru cez kapil\u00e1rnu matricu za \u0161pecifick\u00fdch podmienok. Testovanie indexu toku taveniny sa zvy\u010dajne pou\u017e\u00edva na kontrolu kvality po\u010das v\u00fdroby, ako aj na \u00fa\u010dely v\u00fdskumu a v\u00fdvoja.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testovanie indexu toku taveniny m\u00e1 mnoho v\u00fdhod vr\u00e1tane mo\u017enosti porovna\u0165 materi\u00e1ly na \u00fa\u010dely v\u00fdvoja produktov, ako napr\u00edklad:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hodnotenie vzoriek od nov\u00fdch dod\u00e1vate\u013eov materi\u00e1lov<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Odhad vlastnost\u00ed toku pre jednoduch\u00e9 procesy vytl\u00e1\u010dania<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Predpoveda\u0165 spr\u00e1vanie polym\u00e9ru pri ur\u010dit\u00fdch technik\u00e1ch spracovania<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na r\u00fdchle porovn\u00e1vanie na \u00fa\u010dely kontroly kvality a v\u00fdroby.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Okrem toho sa testovanie indexu toku taveniny m\u00f4\u017ee pou\u017ei\u0165 na overenie zhody materi\u00e1lu s certifik\u00e1tom anal\u00fdzy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Taktie\u017e na rozl\u00ed\u0161enie jednotliv\u00fdch tried materi\u00e1lu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testovanie indexu toku taveniny je z\u00e1kladn\u00fdm n\u00e1strojom pre ka\u017ed\u00fa spolo\u010dnos\u0165, ktor\u00e1 pracuje s termoplastick\u00fdmi materi\u00e1lmi. Ke\u010f\u017ee test indexu toku taveniny je ve\u013emi univerz\u00e1lny, m\u00e1 mnoho v\u00fdhod, v\u010faka ktor\u00fdm je u\u017eito\u010dn\u00fd pre r\u00f4zne aplik\u00e1cie pri v\u00fdvoji v\u00fdrobkov, kontrole kvality a v\u00fdbere materi\u00e1lov.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Aplik\u00e1cie testera MFI<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sk\u00fa\u0161ka indexu toku taveniny, zn\u00e1ma aj ako r\u00fdchlos\u0165 toku taveniny (MFR), meria r\u00fdchlos\u0165 vytl\u00e1\u010dania roztaven\u00e9ho polym\u00e9ru cez kapil\u00e1ru s ur\u010dit\u00fdm priemerom a d\u013a\u017ekou. V\u00fdsledn\u00e1 hodnota sa vyjadruje ako hmotnos\u0165 vytla\u010den\u00e9ho polym\u00e9ru za jednotku \u010dasu v gramoch za 10 min\u00fat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hodnoty MFR m\u00f4\u017eu poskytn\u00fa\u0165 u\u017eito\u010dn\u00e9 inform\u00e1cie o kvalite a konzistencii materi\u00e1lu. Napr\u00edklad vysok\u00e1 hodnota MFR nazna\u010duje materi\u00e1l s dobr\u00fdmi tokov\u00fdmi vlastnos\u0165ami, zatia\u013e \u010do n\u00edzka hodnota MFR nazna\u010duje materi\u00e1l so zl\u00fdmi tokov\u00fdmi vlastnos\u0165ami.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testy indexu toku taveniny sa \u010dasto pou\u017e\u00edvaj\u00fa pri<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>plastov\u00fd priemysel na kontrolu kvality termoplastick\u00fdch materi\u00e1lov<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Okrem toho m\u00f4\u017eu ma\u0165 testy indexu toku taveniny aj \u010fal\u0161ie priemyseln\u00e9 aplik\u00e1cie. Sk\u00fa\u0161ky indexu toku taveniny sa m\u00f4\u017eu napr\u00edklad pou\u017ei\u0165 na ur\u010denie konzistencie jednotliv\u00fdch \u0161ar\u017e\u00ed \u017eivice alebo termoplastick\u00fdch materi\u00e1lov. Testy indexu toku taveniny s\u00fa preto d\u00f4le\u017eit\u00fdm n\u00e1strojom kontroly kvality v r\u00f4znych priemyseln\u00fdch odvetviach.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sk\u00fa\u0161ka indexu toku taveniny sa pou\u017e\u00edva na klasifik\u00e1ciu termoplastick\u00fdch materi\u00e1lov a ur\u010denie ich kvality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je mierou odporu materi\u00e1lu proti toku a ako tak\u00fd je d\u00f4le\u017eit\u00fdm faktorom v mnoh\u00fdch priemyseln\u00fdch aplik\u00e1ci\u00e1ch. Index toku taveniny sa m\u00f4\u017ee pou\u017ei\u0165 napr\u00edklad na optimaliz\u00e1ciu spracovania plastov.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00f4\u017ee sa pou\u017ei\u0165 aj na rie\u0161enie probl\u00e9mov vo v\u00fdrobe a na v\u00fdber materi\u00e1lov pre konkr\u00e9tne kone\u010dn\u00e9 pou\u017eitie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Okrem toho sa index toku taveniny m\u00f4\u017ee pou\u017ei\u0165 ako n\u00e1stroj kontroly kvality na zabezpe\u010denie toho, aby d\u00e1vky materi\u00e1lu sp\u013a\u0148ali \u0161pecifik\u00e1cie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V d\u00f4sledku toho je test indexu toku taveniny z\u00e1kladn\u00fdm n\u00e1strojom v mnoh\u00fdch priemyseln\u00fdch odvetviach.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Medzin\u00e1rodn\u00e9 normy pre testovanie indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Testy indexu toku taveniny, zn\u00e1me aj ako testy r\u00fdchlosti toku taveniny, s\u00fa pre mnoh\u00fdch v\u00fdrobcov plastov z\u00e1kladn\u00fdm meradlom kontroly kvality. Tieto testy pom\u00e1haj\u00fa ur\u010di\u0165 tokov\u00e9 vlastnosti roztaven\u00fdch plastov, \u010do s\u00fa d\u00f4le\u017eit\u00e9 inform\u00e1cie pre n\u00e1vrh v\u00fdrobku aj jeho v\u00fdrobu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existuj\u00fa dve medzin\u00e1rodn\u00e9 normy na testovanie indexu toku taveniny:&nbsp;<strong>ASTM D1238 a ISO 1133.<\/strong>&nbsp;Tieto normy definuj\u00fa \u0161pecifik\u00e1cie zariaden\u00ed a sk\u00fa\u0161obn\u00e9 met\u00f3dy, ktor\u00e9 by sa mali pou\u017e\u00edva\u0165.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pri uv\u00e1dzan\u00ed v\u00fdsledkov testu indexu toku taveniny je d\u00f4le\u017eit\u00e9 uvies\u0165 konkr\u00e9tne pou\u017eit\u00e9 parametre testu, ako je hmotnos\u0165 a teplota. Je to preto, \u017ee r\u00f4zne materi\u00e1ly si vy\u017eaduj\u00fa r\u00f4zne podmienky na presn\u00e9 od\u010d\u00edtanie. Dodr\u017eiavan\u00edm t\u00fdchto medzin\u00e1rodn\u00fdch noriem m\u00f4\u017eu v\u00fdrobcovia zabezpe\u010di\u0165, aby ich testovanie indexu toku taveniny bolo spo\u013eahliv\u00e9 a presn\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tieto normy sa vyu\u017e\u00edvaj\u00fa, preto\u017ee definuj\u00fa \u0161pecifik\u00e1cie zariaden\u00ed a sk\u00fa\u0161obn\u00e9 met\u00f3dy. Je d\u00f4le\u017eit\u00e9, aby sa spolu s v\u00fdsledkami uv\u00e1dzali aj parametre sk\u00fa\u0161ok. Je to povinn\u00e9, preto\u017ee pre r\u00f4zne typy materi\u00e1lov sa navrhuj\u00fa r\u00f4zne hmotnosti a teploty.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny mo\u017eno zisti\u0165 aj pozorovan\u00edm zmeny hmotnosti v priebehu \u010dasu, ako sa uv\u00e1dza v norme ISO 11357-3. T\u00e1to norma definuje tri typy sk\u00fa\u0161ok: r\u00fdchlos\u0165 toku taveniny, objemov\u00fa r\u00fdchlos\u0165 taveniny a hmotnostn\u00fa r\u00fdchlos\u0165 taveniny, ktor\u00e9 s\u00fa v\u0161etky meraniami toho ist\u00e9ho indexu. Hlavn\u00e9 rozdiely s\u00fa v \u0161pecifik\u00e1ci\u00e1ch matrice a v pou\u017eit\u00fdch hmotnostiach. Pri sk\u00fa\u0161ke r\u00fdchlosti objemu taveniny sa pou\u017e\u00edva norma ISO 11357-1, zatia\u013e \u010do pri sk\u00fa\u0161ke r\u00fdchlosti hmotnosti taveniny sa odkazuje na normu ISO11357-2. Na prepo\u010det medzi t\u00fdmito r\u00fdchlos\u0165ami je potrebn\u00e9 vzia\u0165 do \u00favahy zmiznut\u00e9 polym\u00e9ry, preto\u017ee nevych\u00e1dzaj\u00fa cez otvor lisu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Zhrnutie<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Test indexu toku taveniny je dobre zn\u00e1my test pou\u017e\u00edvan\u00fd na ur\u010denie kvality termoplastick\u00fdch materi\u00e1lov. Be\u017ene sa pou\u017e\u00edva aj na kontrolu konzistencie \u017eivice alebo termoplastick\u00fdch materi\u00e1lov z d\u00e1vky na d\u00e1vku. Tento test je zalo\u017een\u00fd na princ\u00edpe, \u017ee r\u00fdchlos\u0165 toku taveniny polym\u00e9ru s\u00favis\u00ed s jeho molekulovou hmotnos\u0165ou. Vo v\u0161eobecnosti plat\u00ed, \u017ee polym\u00e9ry s vysokou molekulovou hmotnos\u0165ou maj\u00fa v\u00e4\u010d\u0161\u00ed odpor proti toku, zatia\u013e \u010do polym\u00e9ry s ni\u017e\u0161ou molekulovou hmotnos\u0165ou maj\u00fa men\u0161\u00ed odpor proti toku. Tento test je preto d\u00f4le\u017eit\u00fdm n\u00e1strojom pre pracovn\u00edkov v plastik\u00e1rskom priemysle, ktor\u00ed potrebuj\u00fa zabezpe\u010di\u0165 kvalitu a konzistenciu svojich v\u00fdrobkov.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Na\u0161ich kupuj\u00facich podporujeme ide\u00e1lnymi v\u00fdrobkami vysokej kvality a vysokou \u00farov\u0148ou slu\u017eieb. Stali sme sa profesion\u00e1lnym v\u00fdrobcom v tejto oblasti, nazbierali sme bohat\u00e9 praktick\u00e9 sk\u00fasenosti v oblasti&nbsp;<a href=\"https:\/\/www.materialstests.com\/sk\/products\/mct-01-motorized-cap-torque-tester.html\/\">Tester kr\u00fatiaceho momentu uz\u00e1veru f\u013ea\u0161e<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/mct-01-motorized-cap-torque-tester.html\/\">Stroj na testovanie kr\u00fatiaceho momentu<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/btt-01-ball-tack-tester.html\/\">Tester gu\u013e\u00f4\u010dkov\u00fdch pr\u00edchytiek<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/fpt-01-friction-and-peel-tester.html\/\">Tester trenia a odlupovania<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/melt-flow-rate-tester.html\/\">Tester prietoku taveniny<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/wtt-wall-thickness-tester.html\/\">Tester hr\u00fabky steny<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/tt-01-torque-tester.html\/\">Elektronick\u00fd tester kr\u00fatiaceho momentu<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/tst-01-tensile-tester.html\/\">V\u00fdrobca \u0165ahov\u00fdch testerov<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/texture-analyzer.html\/\">Analyz\u00e1tor text\u00far<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/sld-01-elmendorf-tear-tester.html\/\">Tester slz Elmendorf<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/pit-01-film-pendulum-impact-tester.html\/\">N\u00e1razov\u00fd tester filmov\u00e9ho kyvadla<\/a>,<a href=\"https:\/\/www.materialstests.com\/sk\/products\/per-01-bottle-perpendicularity-tester.html\/\">Tester kolmosti flia\u0161<\/a>&nbsp;v\u00fdroba a riadenie<\/p>","protected":false},"excerpt":{"rendered":"<p>Ako mera\u0165 index toku taveniny a pre\u010do je d\u00f4le\u017eit\u00fd tester MFI? Index toku taveniny (MFI) je miera hmotnosti polym\u00e9ru, ktor\u00fd prete\u010die kapil\u00e1rou pri stanovenej teplote a tlaku po\u010das meran\u00e9ho \u010dasov\u00e9ho obdobia. Index toku taveniny sa zvy\u010dajne pou\u017e\u00edva na meranie r\u00fdchlosti toku taveniny (MFR) [...]<\/p>","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1048","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/posts\/1048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/comments?post=1048"}],"version-history":[{"count":0,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/posts\/1048\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/media?parent=1048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/categories?post=1048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/tags?post=1048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}