{"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\/cs\/resources\/how-to-measure-melt-flow-index-and-why-is-mfi-tester-important.html","title":{"rendered":"Jak m\u011b\u0159it index toku taveniny a pro\u010d je d\u016fle\u017eit\u00fd tester MFI?"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>Jak m\u011b\u0159it index toku taveniny a pro\u010d je d\u016fle\u017eit\u00fd tester MFI?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny (MFI) je m\u00edra hmotnosti polymeru, kter\u00fd prot\u00e9k\u00e1 kapil\u00e1rou p\u0159i ur\u010dit\u00e9 teplot\u011b a tlaku b\u011bhem m\u011b\u0159en\u00e9ho \u010dasov\u00e9ho \u00faseku. Index toku taveniny se obvykle pou\u017e\u00edv\u00e1 k m\u011b\u0159en\u00ed rychlosti toku taveniny (MFR) polymeru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny (MFI) je tedy standardizovan\u00e1 m\u00edra hmotnosti polymeru, kter\u00fd prot\u00e9k\u00e1 kapil\u00e1rou za stanovenou dobu. Index toku taveniny je m\u00edrou rychlosti toku roztaven\u00e9ho polymeru a b\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 k hodnocen\u00ed kvality polymern\u00ed d\u00e1vky.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Pr\u016ftok taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pr\u016ftok taveniny (MFR) je hmotnost polymeru, kter\u00e1 prote\u010de b\u011bhem zkou\u0161ky za ur\u010ditou dobu. Rychlost toku taveniny je m\u011b\u0159\u00edtkem snadnosti zpracov\u00e1n\u00ed polymeru taveninou. Rychlost toku taveniny lze m\u011b\u0159it pomoc\u00ed testeru 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\">Na str\u00e1nk\u00e1ch&nbsp;<strong>Tester indexu toku taveniny<\/strong>&nbsp;se skl\u00e1d\u00e1 z vytla\u010dovac\u00edho lisu, matrice a motoru. Sestava motoru poh\u00e1n\u00ed \u0161nek, kter\u00fd poh\u00e1n\u00ed polymer skrz matrici. Velikost otvoru matrice ur\u010duje rychlost, kterou polymer proud\u00ed. Roztaven\u00fd polymer vystupuj\u00edc\u00ed z lisu pad\u00e1 na v\u00e1\u017eic\u00ed plo\u0161inu, kde se v pr\u016fb\u011bhu \u010dasu zaznamen\u00e1v\u00e1 hmotnost polymeru. Ze zaznamenan\u00fdch \u00fadaj\u016f se pak vypo\u010d\u00edt\u00e1 rychlost toku taveniny. Index toku taveniny je u\u017eite\u010dn\u00fd pro kontrolu kvality a stanoven\u00ed podm\u00ednek zpracov\u00e1n\u00ed polymer\u016f. Pou\u017e\u00edv\u00e1 se tak\u00e9 k porovn\u00e1n\u00ed r\u016fzn\u00fdch polymer\u016f z hlediska jejich vhodnosti pro danou aplikaci.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>V\u00fdznam MFI<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">K m\u011b\u0159en\u00ed indexu toku taveniny se pou\u017e\u00edvaj\u00ed testery, kter\u00e9 lze nal\u00e9zt v mnoha laborato\u0159\u00edch a za\u0159\u00edzen\u00edch pro kontrolu kvality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index tekutosti taveniny m\u016f\u017ee b\u00fdt ovlivn\u011bn mnoha faktory, jako je typ polymeru, molekulov\u00e1 hmotnost polymeru, nastaven\u00ed testeru indexu tekutosti taveniny a podm\u00ednky prost\u0159ed\u00ed b\u011bhem testov\u00e1n\u00ed. Index toku taveniny je d\u016fle\u017eit\u00fdm m\u011b\u0159\u00edtkem kvality polymeru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI Tester lze pou\u017e\u00edt k \u0159e\u0161en\u00ed probl\u00e9m\u016f s v\u00fdrobn\u00ed \u0161ar\u017e\u00ed nebo ke sledov\u00e1n\u00ed zm\u011bn v polymern\u00edch formulac\u00edch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Jak bylo uvedeno v\u00fd\u0161e, index toku taveniny (MFI) je m\u011b\u0159\u00edtkem hmotnosti polymeru, kter\u00fd prot\u00e9k\u00e1 kapil\u00e1rou p\u0159i stanoven\u00e9 teplot\u011b a tlaku b\u011bhem m\u011b\u0159en\u00e9ho \u010dasov\u00e9ho \u00faseku. Tester indexu toku taveniny lze pou\u017e\u00edt k m\u011b\u0159en\u00ed indexu toku taveniny polymeru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index tekutosti taveniny je d\u016fle\u017eitou vlastnost\u00ed, proto\u017ee souvis\u00ed s viskozitou polymeru, kter\u00e1 n\u00e1sledn\u011b ovliv\u0148uje zpracov\u00e1n\u00ed polymeru.  Index toku taveniny lze tedy pou\u017e\u00edt k optimalizaci podm\u00ednek zpracov\u00e1n\u00ed polymer\u016f. Jeliko\u017e je index toku taveniny tak\u00e9 ukazatelem viskozity polymeru, lze jej pou\u017e\u00edt ke korelaci p\u0159i studiu vlastnost\u00ed polymeru. Jak v\u00edme, viskozita je schopnost roztaven\u00e9ho materi\u00e1lu proudit pod tlakem. Index toku taveniny materi\u00e1lu je nep\u0159\u00edmo \u00fam\u011brn\u00fd viskozit\u011b.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Krom\u011b toho lze index toku taveniny pou\u017e\u00edt ke klasifikaci polymer\u016f a k v\u00fdb\u011bru vhodn\u00fdch polymer\u016f pro konkr\u00e9tn\u00ed aplikace. Index toku taveniny je d\u016fle\u017eitou vlastnost\u00ed z mnoha d\u016fvod\u016f a m\u011bl by se m\u011b\u0159it, pokud je to mo\u017en\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI lze tak\u00e9 pou\u017e\u00edt k porovn\u00e1n\u00ed distribuce molekulov\u00fdch hmotnost\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI lze tedy korelovat s r\u016fzn\u00fdmi vlastnostmi polymeru, jako je molekulov\u00e1 hmotnost, viskozita a hmotnostn\u00ed distribuce.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Kl\u00ed\u010dov\u00e9 body pro MFI<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u010c\u00edm vy\u0161\u0161\u00ed je index toku taveniny polymeru, t\u00edm ni\u017e\u0161\u00ed je jeho molekulov\u00e1 hmotnost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MFI je nep\u0159\u00edmo \u00fam\u011brn\u00e1 viskozit\u011b polymeru.<strong>.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hodnoty indexu toku taveniny jednoho materi\u00e1lu p\u0159i r\u016fzn\u00fdch gravimetrick\u00fdch hmotnostech lze pou\u017e\u00edt k m\u011b\u0159en\u00ed rozlo\u017een\u00ed molekulov\u00e9 hmotnosti zkou\u0161en\u00e9ho polymeru.<\/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 hmotnost polymeru<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index tekutosti taveniny je zkou\u0161ka, kter\u00e1 se pou\u017e\u00edv\u00e1 ke stanoven\u00ed pr\u016fm\u011brn\u00e9 molekulov\u00e9 hmotnosti termoplastick\u00e9ho polymeru. Zkou\u0161ka Melt Flow Index se prov\u00e1d\u00ed zah\u0159\u00e1t\u00edm vzorku polymeru na ur\u010ditou teplotu a m\u011b\u0159en\u00edm doby, za kterou polymer prot\u00e9k\u00e1 mal\u00fdm otvorem. Index toku taveniny je nep\u0159\u00edmo \u00fam\u011brn\u00fd pr\u016fm\u011brn\u00e9 molekulov\u00e9 hmotnosti polymeru; vysok\u00fd index toku taveniny tedy znamen\u00e1 n\u00edzkou pr\u016fm\u011brnou molekulovou hmotnost, zat\u00edmco n\u00edzk\u00fd index toku taveniny znamen\u00e1 vysokou pr\u016fm\u011brnou molekulovou hmotnost. Index toku taveniny se b\u011b\u017en\u011b pou\u017e\u00edv\u00e1 jako m\u011b\u0159\u00edtko kontroly kvality plast\u016f, proto\u017ee p\u0159\u00edmo souvis\u00ed s fyzik\u00e1ln\u00edmi a syntetick\u00fdmi vlastnostmi plastu. Vysok\u00fd index toku taveniny znamen\u00e1, \u017ee plast je kvalitn\u00ed a vhodn\u00fd k pou\u017eit\u00ed, zat\u00edmco n\u00edzk\u00fd index toku taveniny znamen\u00e1, \u017ee plast je nekvalitn\u00ed a nen\u00ed vhodn\u00fd k pou\u017eit\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Metoda zkou\u0161en\u00ed indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MFI je m\u011b\u0159\u00edtkem snadnosti, s jakou termoplastick\u00fd polymer taje a te\u010de. Hodnota indexu toku taveniny je odvozena z rychlosti protla\u010dov\u00e1n\u00ed roztaven\u00e9ho polymeru matric\u00ed za p\u0159edepsan\u00fdch podm\u00ednek teploty, zat\u00ed\u017een\u00ed a pr\u016fm\u011bru otvoru. Index toku taveniny se vyjad\u0159uje jako hmotnost polymeru v gramech, kter\u00fd prot\u00e9k\u00e1 matric\u00ed za deset minut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu tekutosti taveniny se prov\u00e1d\u00ed vlo\u017een\u00edm vzorku do testeru indexu tekutosti taveniny p\u0159i teplot\u011b vy\u0161\u0161\u00ed, ne\u017e je jeho bod t\u00e1n\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Melt Flow Indexer se skl\u00e1d\u00e1 z elektricky vyh\u0159\u00edvan\u00e9 vn\u011bj\u0161\u00ed z\u00f3ny a vnit\u0159n\u00ed matrice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vzorek se vlo\u017e\u00ed do vnit\u0159n\u00ed matrice a nech\u00e1 se n\u011bkolik minut zcela roztavit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pot\u00e9 se zapne ukazatel toku taveniny a \u0161roubov\u00fd razn\u00edk se za\u010dne pohybovat konstantn\u00ed rychlost\u00ed sm\u011brem dol\u016f a vytla\u010duje roztaven\u00fd polymer otvorem na dn\u011b matrice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pr\u016ftok taveniny se vypo\u010d\u00edt\u00e1 na z\u00e1klad\u011b doby, za kterou 10 g polymeru prote\u010de matric\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rychlost toku taveniny lze pou\u017e\u00edt k p\u0159edpov\u011bdi n\u011bkolika vlastnost\u00ed materi\u00e1lu, jako je chov\u00e1n\u00ed p\u0159i zpracov\u00e1n\u00ed, dlouhodob\u00e9 viskoelastick\u00e9 chov\u00e1n\u00ed, stabilita p\u0159i kone\u010dn\u00e9m pou\u017eit\u00ed atd. Je proto d\u016fle\u017eit\u00fdm parametrem kontroly kvality mnoha polymer\u016f a plastov\u00fdch materi\u00e1l\u016f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu tekutosti taveniny se tedy prov\u00e1d\u00ed za \u00fa\u010delem posouzen\u00ed vhodnosti plastov\u00e9ho granul\u00e1tu pro danou aplikaci na z\u00e1klad\u011b jeho indexu tekutosti taveniny. Na adrese&nbsp;<strong>V\u00fdsledky zkou\u0161ky indexu toku taveniny<\/strong>&nbsp;jsou analyzov\u00e1ny odd\u011blen\u00edm kontroly kvality, aby bylo mo\u017en\u00e9 rozhodnout, zda je testovan\u00fd vzorek vhodn\u00fd k pou\u017eit\u00ed. Zkou\u0161ka indexu tekutosti taveniny je d\u016fle\u017eit\u00fdm n\u00e1strojem pro ur\u010den\u00ed vhodnosti termoplastick\u00e9ho materi\u00e1lu pro danou aplikaci.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>V\u00fdhody testov\u00e1n\u00ed indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu toku taveniny je b\u011b\u017en\u00e1 metoda pou\u017e\u00edvan\u00e1 k hodnocen\u00ed tokov\u00fdch vlastnost\u00ed termoplast\u016f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je m\u011b\u0159\u00edtkem snadnosti toku materi\u00e1lu a ur\u010duje se m\u011b\u0159en\u00edm rychlosti protla\u010dov\u00e1n\u00ed roztaven\u00e9ho polymeru kapil\u00e1rn\u00ed matric\u00ed za specifick\u00fdch podm\u00ednek. Testov\u00e1n\u00ed indexu toku taveniny se obvykle pou\u017e\u00edv\u00e1 pro kontrolu kvality p\u0159i v\u00fdrob\u011b a tak\u00e9 pro \u00fa\u010dely v\u00fdzkumu a v\u00fdvoje.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testov\u00e1n\u00ed indexu tekutosti taveniny p\u0159in\u00e1\u0161\u00ed \u0159adu v\u00fdhod, v\u010detn\u011b mo\u017enosti porovn\u00e1vat materi\u00e1ly pro v\u00fdvoj produkt\u016f, jako jsou:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vyhodnocen\u00ed vzork\u016f od nov\u00fdch dodavatel\u016f materi\u00e1l\u016f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Odhad tokov\u00fdch vlastnost\u00ed pro jednoduch\u00e9 vytla\u010dovac\u00ed procesy<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P\u0159edv\u00eddat chov\u00e1n\u00ed polymeru p\u0159i ur\u010dit\u00fdch technik\u00e1ch zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prov\u00e1d\u011bn\u00ed rychl\u00fdch porovn\u00e1n\u00ed pro kontrolu kvality a v\u00fdroby.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ku indexu toku taveniny lze nav\u00edc pou\u017e\u00edt k ov\u011b\u0159en\u00ed shody materi\u00e1lu s certifik\u00e1tem anal\u00fdzy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tak\u00e9 k rozli\u0161en\u00ed t\u0159\u00edd materi\u00e1lu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Testov\u00e1n\u00ed indexu toku taveniny je z\u00e1kladn\u00edm n\u00e1strojem pro ka\u017edou spole\u010dnost, kter\u00e1 pracuje s termoplastick\u00fdmi materi\u00e1ly. Proto\u017ee je zkou\u0161ka indexu toku taveniny velmi univerz\u00e1ln\u00ed, m\u00e1 mnoho v\u00fdhod, kter\u00e9 ji \u010din\u00ed u\u017eite\u010dnou pro r\u016fzn\u00e9 aplikace p\u0159i v\u00fdvoji v\u00fdrobk\u016f, kontrole kvality a v\u00fdb\u011bru materi\u00e1l\u016f.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Aplikace testeru MFI<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu toku taveniny, zn\u00e1m\u00e1 tak\u00e9 jako rychlost toku taveniny (MFR), m\u011b\u0159\u00ed rychlost vytla\u010dov\u00e1n\u00ed roztaven\u00e9ho polymeru kapil\u00e1rou o ur\u010dit\u00e9m pr\u016fm\u011bru a d\u00e9lce. V\u00fdsledn\u00e1 hodnota je vyj\u00e1d\u0159ena jako hmotnost vytla\u010den\u00e9ho polymeru za jednotku \u010dasu v gramech za 10 minut.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hodnoty MFR mohou poskytnout u\u017eite\u010dn\u00e9 informace o kvalit\u011b a konzistenci materi\u00e1lu. Nap\u0159\u00edklad vysok\u00e1 hodnota MFR ozna\u010duje materi\u00e1l s dobr\u00fdmi tokov\u00fdmi vlastnostmi, zat\u00edmco n\u00edzk\u00e1 hodnota MFR ozna\u010duje materi\u00e1l se \u0161patn\u00fdmi tokov\u00fdmi vlastnostmi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ky indexu toku taveniny se \u010dasto pou\u017e\u00edvaj\u00ed v oblasti<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>plastov\u00fd pr\u016fmysl pro kontrolu kvality termoplastick\u00fdch materi\u00e1l\u016f.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Krom\u011b toho mohou m\u00edt zkou\u0161ky indexu toku taveniny i dal\u0161\u00ed pr\u016fmyslov\u00e9 vyu\u017eit\u00ed. Zkou\u0161ky indexu toku taveniny lze nap\u0159\u00edklad pou\u017e\u00edt ke stanoven\u00ed konzistence jednotliv\u00fdch \u0161ar\u017e\u00ed prysky\u0159ic nebo termoplast\u016f. Zkou\u0161ky indexu toku taveniny jsou proto d\u016fle\u017eit\u00fdm n\u00e1strojem pro kontrolu kvality v r\u016fzn\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu tekutosti taveniny se pou\u017e\u00edv\u00e1 ke klasifikaci termoplastick\u00fdch materi\u00e1l\u016f a ur\u010den\u00ed jejich kvality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny je m\u011b\u0159\u00edtkem odporu materi\u00e1lu proti toku a jako takov\u00fd je d\u016fle\u017eit\u00fdm faktorem v mnoha pr\u016fmyslov\u00fdch aplikac\u00edch. Index toku taveniny lze nap\u0159\u00edklad pou\u017e\u00edt k optimalizaci zpracov\u00e1n\u00ed plast\u016f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lze ji tak\u00e9 pou\u017e\u00edt k \u0159e\u0161en\u00ed probl\u00e9m\u016f ve v\u00fdrob\u011b a k v\u00fdb\u011bru materi\u00e1l\u016f pro konkr\u00e9tn\u00ed kone\u010dn\u00e9 pou\u017eit\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Krom\u011b toho lze index toku taveniny pou\u017e\u00edt jako n\u00e1stroj kontroly kvality, aby se zajistilo, \u017ee \u0161ar\u017ee materi\u00e1lu spl\u0148uj\u00ed specifikace.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu toku taveniny je proto v mnoha pr\u016fmyslov\u00fdch odv\u011btv\u00edch nezbytn\u00fdm n\u00e1strojem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Mezin\u00e1rodn\u00ed normy pro zkou\u0161en\u00ed indexu toku taveniny<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ky indexu toku taveniny, zn\u00e1m\u00e9 tak\u00e9 jako zkou\u0161ky rychlosti toku taveniny, jsou pro mnoho v\u00fdrobc\u016f plast\u016f z\u00e1kladn\u00edm opat\u0159en\u00edm kontroly kvality. Tyto zkou\u0161ky pom\u00e1haj\u00ed ur\u010dit tokov\u00e9 vlastnosti roztaven\u00fdch plast\u016f, co\u017e jsou d\u016fle\u017eit\u00e9 informace pro n\u00e1vrh i v\u00fdrobu v\u00fdrobku.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existuj\u00ed dv\u011b mezin\u00e1rodn\u00ed normy pro testov\u00e1n\u00ed indexu toku taveniny:&nbsp;<strong>ASTM D1238 a ISO 1133.<\/strong>&nbsp;Tyto normy definuj\u00ed jak specifikace za\u0159\u00edzen\u00ed, tak zku\u0161ebn\u00ed metody, kter\u00e9 by se m\u011bly pou\u017e\u00edvat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P\u0159i uv\u00e1d\u011bn\u00ed v\u00fdsledk\u016f zkou\u0161ky indexu tekutosti taveniny je d\u016fle\u017eit\u00e9 uv\u00e9st konkr\u00e9tn\u00ed pou\u017eit\u00e9 parametry zkou\u0161ky, jako je hmotnost a teplota. Je to proto, \u017ee r\u016fzn\u00e9 materi\u00e1ly vy\u017eaduj\u00ed pro p\u0159esn\u00fd \u00fadaj r\u016fzn\u00e9 podm\u00ednky. Dodr\u017eov\u00e1n\u00edm t\u011bchto mezin\u00e1rodn\u00edch norem mohou v\u00fdrobci zajistit, \u017ee jejich zkou\u0161ky indexu tekutosti taveniny budou spolehliv\u00e9 a p\u0159esn\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tyto normy se pou\u017e\u00edvaj\u00ed, proto\u017ee definuj\u00ed jak specifikace za\u0159\u00edzen\u00ed, tak zku\u0161ebn\u00ed metody. D\u016fle\u017eit\u00e9 je, aby se spolu s v\u00fdsledky uv\u00e1d\u011bly i parametry zkou\u0161ek. To je povinn\u00e9, proto\u017ee pro r\u016fzn\u00e9 typy materi\u00e1l\u016f jsou navr\u017eeny r\u016fzn\u00e9 hmotnosti a teploty.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Index toku taveniny lze tak\u00e9 zjistit sledov\u00e1n\u00edm zm\u011bny hmotnosti v \u010dase, jak je uvedeno v norm\u011b ISO 11357-3. Tato norma definuje t\u0159i typy zkou\u0161ek: rychlost toku taveniny, objemovou rychlost taveniny a hmotnostn\u00ed rychlost taveniny, co\u017e jsou v\u0161echno m\u011b\u0159en\u00ed stejn\u00e9ho indexu. Hlavn\u00ed rozd\u00edly jsou ve specifikac\u00edch matric a pou\u017eit\u00fdch hmotnost\u00ed. Pro zkou\u0161ku objemov\u00e9 rychlosti t\u00e1n\u00ed se pou\u017e\u00edv\u00e1 norma ISO 11357-1, zat\u00edmco pro zkou\u0161ku hmotnostn\u00ed rychlosti t\u00e1n\u00ed se odkazuje na normu ISO11357-2. Pro p\u0159evod mezi t\u011bmito rychlostmi je t\u0159eba vz\u00edt v \u00favahu zmizel\u00e9 polymery, proto\u017ee nevych\u00e1zej\u00ed otvorem matrice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Souhrn<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zkou\u0161ka indexu tekutosti taveniny je dob\u0159e zn\u00e1m\u00e1 zkou\u0161ka pou\u017e\u00edvan\u00e1 ke stanoven\u00ed kvality termoplastick\u00fdch materi\u00e1l\u016f. B\u011b\u017en\u011b se tak\u00e9 pou\u017e\u00edv\u00e1 ke kontrole konzistence prysky\u0159ice nebo termoplastick\u00fdch materi\u00e1l\u016f mezi jednotliv\u00fdmi \u0161ar\u017eemi. Tato zkou\u0161ka je zalo\u017eena na principu, \u017ee rychlost toku taveniny polymeru souvis\u00ed s jeho molekulovou hmotnost\u00ed. Obecn\u011b plat\u00ed, \u017ee polymery s vysokou molekulovou hmotnost\u00ed maj\u00ed tendenci m\u00edt vy\u0161\u0161\u00ed odpor proti toku, zat\u00edmco polymery s ni\u017e\u0161\u00ed molekulovou hmotnost\u00ed maj\u00ed tendenci m\u00edt ni\u017e\u0161\u00ed odpor proti toku. Tento test je proto d\u016fle\u017eit\u00fdm n\u00e1strojem pro pracovn\u00edky v plastik\u00e1\u0159sk\u00e9m pr\u016fmyslu, kte\u0159\u00ed pot\u0159ebuj\u00ed zajistit kvalitu a konzistenci sv\u00fdch v\u00fdrobk\u016f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sv\u00e9 kupuj\u00edc\u00ed podporujeme ide\u00e1ln\u00edmi v\u00fdrobky vysok\u00e9 kvality a vysokou \u00farovn\u00ed slu\u017eeb. Stali jsme se profesion\u00e1ln\u00edm v\u00fdrobcem v tomto oboru, nashrom\u00e1\u017edili jsme bohat\u00e9 praktick\u00e9 zku\u0161enosti v oblasti&nbsp;<a href=\"https:\/\/www.materialstests.com\/cs\/products\/mct-01-motorized-cap-torque-tester.html\/\">Tester kroutic\u00edho momentu uz\u00e1v\u011bru lahve<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/mct-01-motorized-cap-torque-tester.html\/\">Zku\u0161ebn\u00ed stroj na kroutic\u00ed moment<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/btt-01-ball-tack-tester.html\/\">Tester kuli\u010dek<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/fpt-01-friction-and-peel-tester.html\/\">Tester t\u0159en\u00ed a odlupov\u00e1n\u00ed<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/melt-flow-rate-tester.html\/\">Tester pr\u016ftoku taveniny<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/wtt-wall-thickness-tester.html\/\">Tester tlou\u0161\u0165ky st\u011bn<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/tt-01-torque-tester.html\/\">Elektronick\u00e1 zkou\u0161e\u010dka kroutic\u00edho momentu<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/tst-01-tensile-tester.html\/\">V\u00fdrobce tahov\u00fdch zkou\u0161e\u010dek<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/texture-analyzer.html\/\">Analyz\u00e1tor textur<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/sld-01-elmendorf-tear-tester.html\/\">Tester slz Elmendorf<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/pit-01-film-pendulum-impact-tester.html\/\">N\u00e1razov\u00e1 zkou\u0161ka kyvadla filmu<\/a>,<a href=\"https:\/\/www.materialstests.com\/cs\/products\/per-01-bottle-perpendicularity-tester.html\/\">Tester kolmosti lahv\u00ed<\/a>&nbsp;v\u00fdroba a \u0159\u00edzen\u00ed<\/p>","protected":false},"excerpt":{"rendered":"<p>Jak m\u011b\u0159it index toku taveniny a pro\u010d je d\u016fle\u017eit\u00fd tester MFI? Index toku taveniny (MFI) je m\u011b\u0159\u00edtkem hmotnosti polymeru, kter\u00fd prot\u00e9k\u00e1 kapil\u00e1rou p\u0159i stanoven\u00e9 teplot\u011b a tlaku b\u011bhem m\u011b\u0159en\u00e9ho \u010dasov\u00e9ho \u00faseku. Index pr\u016ftoku taveniny se obvykle pou\u017e\u00edv\u00e1 k m\u011b\u0159en\u00ed rychlosti pr\u016ftoku 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\/cs\/wp-json\/wp\/v2\/posts\/1048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/comments?post=1048"}],"version-history":[{"count":0,"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/posts\/1048\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/media?parent=1048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/categories?post=1048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.materialstests.com\/cs\/wp-json\/wp\/v2\/tags?post=1048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}