{"id":704,"date":"2026-02-27T08:34:45","date_gmt":"2026-02-27T08:34:45","guid":{"rendered":"https:\/\/www.teartester.com\/?post_type=standard&p=704"},"modified":"2026-02-28T08:22:16","modified_gmt":"2026-02-28T08:22:16","slug":"iso-1974","status":"publish","type":"standard","link":"https:\/\/www.teartester.com\/cs\/standard\/iso-1974\/","title":{"rendered":"ISO 1974"},"content":{"rendered":"

Elmendorfova metoda a jej\u00ed v\u00fdznam pro odolnost pap\u00edru proti roztr\u017een\u00ed<\/h2>\n\n\n\n

Na str\u00e1nk\u00e1ch Elmendorfova metoda<\/strong> poskytuje kontrolovan\u00fd a opakovateln\u00fd p\u0159\u00edstup k hodnocen\u00ed odolnost pap\u00edru proti roztr\u017een\u00ed<\/strong>. M\u011b\u0159\u00ed energetickou ztr\u00e1tu kyvadla po protr\u017een\u00ed p\u0159edseknut\u00e9ho zku\u0161ebn\u00edho t\u011blesa. Principy jsou zalo\u017eeny na materi\u00e1lov\u00fdch v\u011bd\u00e1ch: d\u00e9lka vl\u00e1ken, jejich vazba, \u00farove\u0148 zu\u0161lecht\u011bn\u00ed, plniva, vlhkost a struktura plechu ovliv\u0148uj\u00ed chov\u00e1n\u00ed p\u0159i trh\u00e1n\u00ed. Vy\u0161\u0161\u00ed odolnost proti roztr\u017een\u00ed \u010dasto ukazuje na siln\u011bj\u0161\u00ed s\u00ed\u0165 vl\u00e1ken, zat\u00edmco n\u00edzk\u00e9 hodnoty mohou nazna\u010dovat slabou vazbu nebo nedostate\u010dn\u00e9 zu\u0161lecht\u011bn\u00ed.<\/p>\n\n\n\n

Norma ISO 1974 stanov\u00ed pou\u017eit\u00ed zku\u0161ebn\u00edho vzorku slo\u017een\u00e9ho ze \u010dty\u0159 na sebe polo\u017een\u00fdch list\u016f, pokud vlastnosti materi\u00e1lu nevy\u017eaduj\u00ed \u00fapravu. Kyvadlo trh\u00e1 vzorek pod\u00e9l jedin\u00e9 linie trh\u00e1n\u00ed a p\u0159\u00edstroj zaznamen\u00e1v\u00e1 absorbovanou energii. Laborato\u0159e pak vypo\u010d\u00edtaj\u00ed odolnost proti roztr\u017een\u00ed na list podle vzorc\u016f uveden\u00fdch v norm\u011b, obvykle vyj\u00e1d\u0159en\u00fdch v milinewtonech. V p\u0159\u00edpad\u011b pot\u0159eby lze index trh\u00e1n\u00ed vypo\u010d\u00edtat normalizac\u00ed odolnosti proti trh\u00e1n\u00ed v\u016f\u010di gram\u00e1\u017ei.<\/p>\n\n\n\n

Postup Elmendorfova trhac\u00edho testu v ISO 1974<\/h2>\n\n\n\n

Kl\u00ed\u010dov\u00e9 kroky zahrnuj\u00ed:<\/strong><\/p>\n\n\n\n

    \n
  1. Kondice<\/strong>
    Vzorky p\u0159ipravujte ve stejn\u00e9 atmosf\u00e9\u0159e, v jak\u00e9 se prov\u00e1d\u011bj\u00ed zkou\u0161ky, a zajist\u011bte st\u00e1lou vlhkost. Norma ISO 1974 vy\u017eaduje kontrolovanou teplotu a vlhkost.<\/li>\n\n\n\n
  2. V\u00fdb\u011br a kalibrace p\u0159\u00edstroj\u016f<\/strong>
    Zvolte kombinaci kyvadla nebo kyvadla a zv\u011bt\u0161ovac\u00edho z\u00e1va\u017e\u00ed, kter\u00e1 poskytuje hodnoty mezi 20% a 80% kapacity p\u0159\u00edstroje. T\u00edm se zachov\u00e1 p\u0159esnost m\u011b\u0159en\u00ed.<\/li>\n\n\n\n
  3. Uk\u00e1zka mont\u00e1\u017ee<\/strong>
    Um\u00edst\u011bte do svorek \u010dty\u0159i na sebe polo\u017een\u00e9 archy tak, aby se \u0161t\u011brbina nach\u00e1zela uprost\u0159ed mezi stacion\u00e1rn\u00edmi a v\u00fdkyvn\u00fdmi svorkami. V p\u0159\u00edpad\u011b pot\u0159eby pou\u017eijte vestav\u011bn\u00fd n\u016f\u017e k vytvo\u0159en\u00ed \u0161t\u011brbiny.<\/li>\n\n\n\n
  4. Operace trh\u00e1n\u00ed<\/strong>
    Kyvadlo prudce uvoln\u011bte a po v\u00fdkyvu vp\u0159ed ho opatrn\u011b zachy\u0165te. Zachy\u0165te \u00fadaj na stupnici nebo \u00fadaj o energii.<\/li>\n\n\n\n
  5. Opakovatelnost<\/strong>
    Prove\u010fte alespo\u0148 deset platn\u00fdch test\u016f pro ka\u017ed\u00fd sm\u011br. Odm\u00edtn\u011bte vzorky, kter\u00e9 se v\u00fdrazn\u011b odchyluj\u00ed nebo vykazuj\u00ed nepravideln\u00e9 chov\u00e1n\u00ed p\u0159i trh\u00e1n\u00ed, jako je nadm\u011brn\u00e1 odchylka nebo odlupov\u00e1n\u00ed.<\/li>\n\n\n\n
  6. V\u00fdpo\u010det dat<\/strong>
    Vypo\u010d\u00edtejte pr\u016fm\u011brnou odolnost proti roztr\u017een\u00ed na list a p\u0159\u00edpadn\u011b index roztr\u017een\u00ed. Hodnoty uv\u00e1d\u011bjte v milinewtonech se t\u0159emi v\u00fdznamn\u00fdmi \u010d\u00edslicemi.<\/li>\n<\/ol>\n\n\n\n

    Zkou\u0161ka pevnosti v tahu - metoda a vybaven\u00ed<\/h2>\n\n\n\n

    Na str\u00e1nk\u00e1ch metoda zkou\u0161ky pevnosti v tahu<\/strong> definovan\u00e9 v norm\u011b ISO 1974 z\u00e1vis\u00ed do zna\u010dn\u00e9 m\u00edry na v\u00fdkonu zkou\u0161e\u010dky typu Elmendorf. Kvalitu dat ovliv\u0148uje stabiln\u00ed upnut\u00ed, p\u0159esn\u00fd pohyb kyvadla a konzistentn\u00ed \u0159ez\u00e1n\u00ed. Mnoho pap\u00edrensk\u00fdch a balic\u00edch laborato\u0159\u00ed nyn\u00ed vol\u00ed digit\u00e1ln\u00ed testery trh\u00e1n\u00ed, aby zlep\u0161ily sledovatelnost a minimalizovaly vliv obsluhy.<\/p>\n\n\n\n

    Spole\u010dnost Cell Instruments nab\u00edz\u00ed \u0159e\u0161en\u00ed p\u0159izp\u016fsoben\u00e1 pracovn\u00edm postup\u016fm ISO 1974 a SLD-01 Tester trh\u00e1n\u00ed<\/strong> dob\u0159e odpov\u00edd\u00e1 provozn\u00edm po\u017eadavk\u016fm pap\u00edrov\u00fdch laborato\u0159\u00ed. Pneumatick\u00e9 up\u00edn\u00e1n\u00ed zaji\u0161\u0165uje rovnom\u011brn\u00fd p\u0159\u00edtlak, zat\u00edmco automatick\u00e9 kyvadlov\u00e9 uvol\u0148ov\u00e1n\u00ed eliminuje variabilitu mezi jednotliv\u00fdmi oper\u00e1tory. P\u0159\u00edstroj rovn\u011b\u017e nab\u00edz\u00ed kapacitu kyvadla s v\u00edce rozsahy, dotykov\u00e9 ovl\u00e1d\u00e1n\u00ed, voliteln\u00e9 zobrazen\u00ed mN a indexu trh\u00e1n\u00ed a automatick\u00e9 statistiky dat. Tyto funkce zefektiv\u0148uj\u00ed rutinn\u00ed testov\u00e1n\u00ed trh\u00e1n\u00ed a pom\u00e1haj\u00ed in\u017een\u00fdr\u016fm kontroly kvality udr\u017eovat shodu s metodami ISO.<\/p>","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":true},"standard-category":[3],"class_list":["post-704","standard","type-standard","status-publish","hentry","standard-category-iso"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard\/704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/types\/standard"}],"wp:attachment":[{"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/media?parent=704"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.teartester.com\/cs\/wp-json\/wp\/v2\/standard-category?post=704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}