{"id":6867,"date":"2025-07-16T17:04:37","date_gmt":"2025-07-16T09:04:37","guid":{"rendered":"https:\/\/www.qualitester.com\/?page_id=6867"},"modified":"2025-07-16T17:04:37","modified_gmt":"2025-07-16T09:04:37","slug":"astm-d1922","status":"publish","type":"page","link":"https:\/\/www.qualitester.com\/cs\/standards\/astm-d1922\/","title":{"rendered":"ASTM D1922"},"content":{"rendered":"

ASTM D1922
\nTestov\u00e1n\u00ed slz<\/small><\/h1>\n
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\u00davod do testov\u00e1n\u00ed podle normy ASTM D1922<\/h2>\n

ASTM D1922 je \u0161iroce uzn\u00e1van\u00e1 norma zkou\u0161ka pevnosti v tahu<\/a> metoda<\/strong> se pou\u017e\u00edv\u00e1 k ur\u010den\u00ed s\u00edly pot\u0159ebn\u00e9 k \u0161\u00ed\u0159en\u00ed trhliny v plastov\u00fdch f\u00f3li\u00edch a netuh\u00fdch f\u00f3li\u00edch. Tato metoda je nezbytn\u00e1 pro hodnocen\u00ed mechanick\u00e9 integrity obalov\u00fdch materi\u00e1l\u016f, zejm\u00e9na v aplikac\u00edch, kde odolnost proti roztr\u017een\u00ed p\u0159\u00edmo ovliv\u0148uje ochranu v\u00fdrobku a jeho trvanlivost. Na adrese . Norma ASTM D1922<\/strong> vyu\u017e\u00edv\u00e1 Pevnost Elmendorf v roztr\u017een\u00ed<\/strong> testov\u00e1n\u00ed, p\u0159i kter\u00e9m se m\u011b\u0159\u00ed, jak velk\u00e1 s\u00edla je zapot\u0159eb\u00ed k pokra\u010dov\u00e1n\u00ed trh\u00e1n\u00ed, jakmile bylo zah\u00e1jeno.<\/p>\n

Plastov\u00e9 f\u00f3lie pou\u017e\u00edvan\u00e9 v pru\u017en\u00fdch obalech, n\u00e1dob\u00e1ch na potraviny nebo zdravotnick\u00fdch prost\u0159edc\u00edch jsou vystaveny r\u016fzn\u00fdm manipula\u010dn\u00edm z\u00e1t\u011b\u017e\u00edm. V d\u016fsledku toho je t\u0159eba posoudit jejich odolnost proti roztr\u017een\u00ed<\/strong> pom\u00e1h\u00e1 v\u00fdrobc\u016fm a odborn\u00edk\u016fm na kontrolu kvality zajistit soulad se specifikacemi odolnosti a bezpe\u010dnostn\u00edmi normami.<\/p>\n

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Zku\u0161ebn\u00ed metoda pevnosti v tahu pomoc\u00ed Elmendorfovy trhac\u00ed zkou\u0161ky<\/h2>\n

Zkou\u0161ka podle normy ASTM D1922 se prov\u00e1d\u00ed s pou\u017eit\u00edm Zkou\u0161e\u010dka pevnosti v tahu Elmendorfova typu<\/strong>, jako je nap\u0159. Zkou\u0161e\u010dka pevnosti v tahu SLD-01<\/strong> od spole\u010dnosti Cell Instruments. Toto kyvadlov\u00e9 za\u0159\u00edzen\u00ed simuluje skute\u010dn\u00e9 trh\u00e1n\u00ed s kontrolovanou p\u0159esnost\u00ed. Zde je pops\u00e1n typick\u00fd postup:<\/p>\n

    \n
  • P\u0159ed\u0159ezan\u00fd vzorek je upnut mezi dv\u011b \u010delisti - jednu stacion\u00e1rn\u00ed a druhou na kyvn\u00e9m kyvadle.<\/li>\n
  • Po uvoln\u011bn\u00ed kyvadlo roztrhne vzorek po dr\u00e1ze 43 mm.<\/li>\n
  • Tester m\u011b\u0159\u00ed ztr\u00e1ta energie<\/strong> z pohybu kyvadla, kter\u00fd je v korelaci s pohybem s\u00edla trh\u00e1n\u00ed<\/strong> pot\u0159ebn\u00e9 k \u0161\u00ed\u0159en\u00ed trhliny.<\/li>\n<\/ul>\n

    Zkou\u0161e\u010dky pevnosti v tahu<\/strong> mus\u00ed b\u00fdt pe\u010dliv\u011b kalibrov\u00e1ny pomoc\u00ed kontroln\u00edch z\u00e1va\u017e\u00ed nebo standardizovan\u00fdch postup\u016f, aby byla zaji\u0161t\u011bna p\u0159esnost m\u011b\u0159en\u00ed, zejm\u00e9na u materi\u00e1l\u016f s vysokou anizotropi\u00ed nebo prodlou\u017een\u00edm p\u0159i trh\u00e1n\u00ed.<\/p>\n