{"id":7691,"date":"2025-12-22T14:03:51","date_gmt":"2025-12-22T06:03:51","guid":{"rendered":"https:\/\/www.qualitester.com\/?page_id=7691"},"modified":"2025-12-22T14:05:35","modified_gmt":"2025-12-22T06:05:35","slug":"paper-tear-strength-test","status":"publish","type":"page","link":"https:\/\/www.qualitester.com\/cs\/applications\/paper-tear-strength-test\/","title":{"rendered":"Zkou\u0161ka pevnosti pap\u00edru v tahu"},"content":{"rendered":"<h1 style=\"text-align: center;\" data-start=\"370\" data-end=\"882\">Zkou\u0161ka pevnosti pap\u00edru v tahu podle Elmendorfa<br \/>\n<small>ASTM D689<\/small><\/h1>\n<hr \/>\n<p data-start=\"604\" data-end=\"964\"><img decoding=\"async\" class=\"wp-image-7700 alignleft\" src=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester-297x300.webp\" alt=\"Zkou\u0161ka pevnosti pap\u00edru v tahu\" width=\"208\" height=\"210\" srcset=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester-297x300.webp 297w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester-150x150.webp 150w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester-12x12.webp 12w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester-100x100.webp 100w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Paper-Tear-Strength-Tester.webp 396w\" sizes=\"(max-width: 208px) 100vw, 208px\" \/><\/p>\n<p data-start=\"604\" data-end=\"964\">Na str\u00e1nk\u00e1ch <strong data-start=\"608\" data-end=\"636\">zkou\u0161ka pevnosti pap\u00edru v tahu<\/strong> definovan\u00e9 v <strong data-start=\"648\" data-end=\"661\">ASTM D689<\/strong> je v\u0161eobecn\u011b uzn\u00e1vanou metodou hodnocen\u00ed vnit\u0159n\u00ed odolnosti pap\u00edru proti roztr\u017een\u00ed. Sp\u00ed\u0161e ne\u017e na m\u011b\u0159en\u00ed poru\u0161en\u00ed v tahu se tato zkou\u0161ka zam\u011b\u0159uje na schopnost materi\u00e1lu odol\u00e1vat roztr\u017een\u00ed. <strong data-start=\"838\" data-end=\"880\">\u0161\u00ed\u0159en\u00ed slzy po po\u010d\u00e1te\u010dn\u00ed \u0161t\u011brbin\u011b<\/strong>, kter\u00fd p\u0159esn\u011b odr\u00e1\u017e\u00ed skute\u010dn\u00e9 po\u0161kozen\u00ed p\u0159i zpracov\u00e1n\u00ed, tisku a kone\u010dn\u00e9m pou\u017eit\u00ed.<\/p>\n<p data-start=\"966\" data-end=\"1290\">Pomoc\u00ed kalibrovan\u00e9ho <strong data-start=\"988\" data-end=\"1013\">Tester slz Elmendorf<\/strong>, ASTM D689 poskytuje opakovateln\u00fd a srovnateln\u00fd p\u0159\u00edstup pro stanoven\u00ed pevnosti pap\u00edru v roztr\u017een\u00ed pro r\u016fzn\u00e9 druhy a slo\u017een\u00ed vl\u00e1ken. Tento \u010dl\u00e1nek podrobn\u011b vysv\u011btluje zku\u0161ebn\u00ed metodu a pom\u00e1h\u00e1 pracovn\u00edk\u016fm laborato\u0159\u00ed spr\u00e1vn\u011b aplikovat normu a z\u00edskat spolehliv\u00e9 v\u00fdsledky.<\/p>\n<hr \/>\n<h2 data-start=\"1297\" data-end=\"1362\">Porozum\u011bn\u00ed <strong data-start=\"1314\" data-end=\"1327\">ASTM D689<\/strong> v provozu Elmendorf Tear Testeru<\/h2>\n<p data-start=\"1364\" data-end=\"1670\"><strong data-start=\"1364\" data-end=\"1377\">ASTM D689<\/strong> ur\u010duje pou\u017eit\u00ed <strong data-start=\"1402\" data-end=\"1427\">Tester slz Elmendorf<\/strong>, kter\u00fd funguje na principu energetick\u00fdch ztr\u00e1t. Kdy\u017e kyvadlo kmit\u00e1 v pevn\u00e9m oblouku, roztrhne jednu nebo v\u00edce vrstev pap\u00edru na definovanou vzd\u00e1lenost. Sn\u00ed\u017een\u00ed potenci\u00e1ln\u00ed energie p\u0159\u00edmo odpov\u00edd\u00e1. <strong data-start=\"1646\" data-end=\"1669\">pevnost pap\u00edru p\u0159i trh\u00e1n\u00ed<\/strong>.<\/p>\n<p data-start=\"1672\" data-end=\"1944\">Na rozd\u00edl od statick\u00fdch silov\u00fdch zkou\u0161ek tato metoda dynamick\u00e9ho trh\u00e1n\u00ed zachycuje, jak vl\u00e1kna odol\u00e1vaj\u00ed rychl\u00e9mu \u0161\u00ed\u0159en\u00ed trhlin. Norma umo\u017e\u0148uje testov\u00e1n\u00ed jednotliv\u00fdch list\u016f nebo v\u00edce vrstev v z\u00e1vislosti na pevnosti materi\u00e1lu, co\u017e zaji\u0161\u0165uje, \u017ee nam\u011b\u0159en\u00e1 hodnota spad\u00e1 do optim\u00e1ln\u00edho rozsahu p\u0159\u00edstroje.<\/p>\n<p data-start=\"1946\" data-end=\"1991\">Mezi kl\u00ed\u010dov\u00e9 vlastnosti metody ASTM D689 pat\u0159\u00ed:<\/p>\n<ul data-start=\"1993\" data-end=\"2166\">\n<li data-start=\"1993\" data-end=\"2053\">\n<p data-start=\"1995\" data-end=\"2053\">Pou\u017eit\u00e1 trhac\u00ed s\u00edla <strong data-start=\"2017\" data-end=\"2053\">kolmo na rovinu pap\u00edru<\/strong><\/p>\n<\/li>\n<li data-start=\"2054\" data-end=\"2104\">\n<p data-start=\"2056\" data-end=\"2104\">Pevn\u00e1 d\u00e9lka slzy a \u0159\u00edzen\u00e9 zah\u00e1jen\u00ed trh\u00e1n\u00ed<\/p>\n<\/li>\n<li data-start=\"2105\" data-end=\"2166\">\n<p data-start=\"2107\" data-end=\"2166\">M\u011b\u0159en\u00ed vyj\u00e1d\u0159en\u00e9 jako pr\u016fm\u011brn\u00e1 odolnost proti roztr\u017een\u00ed na vrstvu<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2 data-start=\"2173\" data-end=\"2231\">Pro\u010d <strong data-start=\"2180\" data-end=\"2193\">ASTM D689<\/strong> Z\u00e1le\u017eitosti ve zku\u0161ebn\u00e1ch pap\u00edru<\/h2>\n<p data-start=\"2233\" data-end=\"2486\">Norma ASTM D689 hraje z\u00e1sadn\u00ed roli p\u0159i kontrole kvality a v\u00fdvoji materi\u00e1l\u016f, proto\u017ee <strong data-start=\"2317\" data-end=\"2340\">pevnost pap\u00edru p\u0159i trh\u00e1n\u00ed<\/strong> p\u0159\u00edmo ovliv\u0148uje pou\u017eitelnost a \u017eivotnost. Pap\u00edry s nedostate\u010dnou odolnost\u00ed proti roztr\u017een\u00ed mohou selhat p\u0159i skl\u00e1d\u00e1n\u00ed, v\u00e1z\u00e1n\u00ed nebo balen\u00ed.<\/p>\n<p data-start=\"2488\" data-end=\"2510\">Norma podporuje:<\/p>\n<ul data-start=\"2512\" data-end=\"2675\">\n<li data-start=\"2512\" data-end=\"2560\">\n<p data-start=\"2514\" data-end=\"2560\">Rutinn\u00ed sledov\u00e1n\u00ed kvality v\u00fdroby pap\u00edru<\/p>\n<\/li>\n<li data-start=\"2561\" data-end=\"2606\">\n<p data-start=\"2563\" data-end=\"2606\">Srovn\u00e1vac\u00ed hodnocen\u00ed mezi zn\u00e1mkami pap\u00edru<\/p>\n<\/li>\n<li data-start=\"2607\" data-end=\"2675\">\n<p data-start=\"2609\" data-end=\"2675\">P\u0159edpov\u011b\u010f v\u00fdkonnosti p\u0159i pou\u017eit\u00ed spolu se zkou\u0161kami v tahu a trhac\u00edmi zkou\u0161kami<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2677\" data-end=\"2833\">Proto\u017ee norma ASTM D689 je v souladu s mezin\u00e1rodn\u00edmi metodami, jako jsou ISO 1974 a TAPPI T414, umo\u017e\u0148uje tak\u00e9 konzistentn\u00ed porovn\u00e1v\u00e1n\u00ed \u00fadaj\u016f v r\u00e1mci glob\u00e1ln\u00edch dodavatelsk\u00fdch \u0159et\u011bzc\u016f.<\/p>\n<hr \/>\n<h2 data-start=\"4884\" data-end=\"4934\"><strong data-start=\"2843\" data-end=\"2871\">Zkou\u0161ka pevnosti pap\u00edru v tahu<\/strong> a m\u011b\u0159en\u00ed pevnosti pap\u00edru v tahu<\/h2>\n<p data-start=\"2912\" data-end=\"3118\">Na str\u00e1nk\u00e1ch <strong data-start=\"2916\" data-end=\"2944\">zkou\u0161ka pevnosti pap\u00edru v tahu<\/strong> podle normy ASTM D689 kvantifikuje pr\u016fm\u011brnou s\u00edlu pot\u0159ebnou k pokra\u010dov\u00e1n\u00ed trh\u00e1n\u00ed po jeho zah\u00e1jen\u00ed. Tato hodnota odr\u00e1\u017e\u00ed vnit\u0159n\u00ed vazbu vl\u00e1ken, d\u00e9lku vl\u00e1ken a tvorbu list\u016f.<\/p>\n<p data-start=\"3120\" data-end=\"3163\">Mezi d\u016fle\u017eit\u00e9 technick\u00e9 aspekty pat\u0159\u00ed:<\/p>\n<ul data-start=\"3165\" data-end=\"3390\">\n<li data-start=\"3165\" data-end=\"3245\">\n<p data-start=\"3167\" data-end=\"3245\">Sm\u011brov\u00e9 testov\u00e1n\u00ed v <strong data-start=\"3190\" data-end=\"3216\">sm\u011br stroje (MD)<\/strong> a <strong data-start=\"3221\" data-end=\"3245\">p\u0159\u00ed\u010dn\u00fd sm\u011br (CD)<\/strong><\/p>\n<\/li>\n<li data-start=\"3246\" data-end=\"3316\">\n<p data-start=\"3248\" data-end=\"3316\">Pou\u017eit\u00ed v\u00edce vrstev pro zaji\u0161t\u011bn\u00ed hodnot bl\u00edzk\u00fdch 40% pln\u00e9 stupnice<\/p>\n<\/li>\n<li data-start=\"3317\" data-end=\"3390\">\n<p data-start=\"3319\" data-end=\"3390\">Uv\u00e1d\u011bn\u00ed v\u00fdsledk\u016f na jeden list, i kdy\u017e je testov\u00e1no v\u00edce vrstev.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3392\" data-end=\"3538\">Odolnost pap\u00edru proti roztr\u017een\u00ed se \u010dasto v\u00fdrazn\u011b li\u0161\u00ed mezi MD a CD, tak\u017ee sm\u011brov\u00e9 testov\u00e1n\u00ed je pro p\u0159esnou charakterizaci nezbytn\u00e9.<\/p>\n<hr \/>\n<h2>P\u0159\u00edprava vzork\u016f a zku\u0161ebn\u00ed postupy podle normy ASTM D689<\/h2>\n<p data-start=\"3614\" data-end=\"3693\">Spr\u00e1vn\u00e1 p\u0159\u00edprava vzorku zaji\u0161\u0165uje platn\u00e9 a opakovateln\u00e9 v\u00fdsledky podle normy ASTM D689.<\/p>\n<p data-start=\"3695\" data-end=\"3846\"><strong data-start=\"3695\" data-end=\"3711\">Kondice<\/strong><br \/>\nPap\u00edrov\u00e9 vzorky mus\u00ed b\u00fdt p\u0159ed zah\u00e1jen\u00edm zkou\u0161ek kondicionov\u00e1ny za standardn\u00edch atmosf\u00e9rick\u00fdch podm\u00ednek definovan\u00fdch p\u0159\u00edslu\u0161n\u00fdmi zku\u0161ebn\u00edmi postupy.<\/p>\n<p data-start=\"3848\" data-end=\"4063\"><strong data-start=\"3848\" data-end=\"3866\">Nastaven\u00ed vzorku<\/strong><br \/>\nListy se skl\u00e1daj\u00ed do po\u017eadovan\u00e9ho po\u010dtu vrstev s d\u016fslednou orientac\u00ed v\u0161ech stran dr\u00e1tu. Vzorek se vyst\u0159ed\u00ed v kle\u0161t\u00edch a zavede se po\u010d\u00e1te\u010dn\u00ed \u0161t\u011brbina pro veden\u00ed \u0161\u00ed\u0159en\u00ed trhliny.<\/p>\n<p data-start=\"4065\" data-end=\"4294\"><strong data-start=\"4065\" data-end=\"4083\">Proveden\u00ed testu<\/strong><br \/>\nKyvadlo se zvedne do v\u00fdchoz\u00ed polohy a plynule se uvoln\u00ed. Jak se vzorek trh\u00e1, ukazatel zaznamen\u00e1v\u00e1 spot\u0159ebovanou energii. Zkou\u0161e\u010dka zaznamen\u00e1v\u00e1 pr\u016fm\u011brnou trhac\u00ed s\u00edlu na pevn\u011b stanoven\u00e9 vzd\u00e1lenosti trh\u00e1n\u00ed.<\/p>\n<p data-start=\"4296\" data-end=\"4505\"><strong data-start=\"4296\" data-end=\"4314\">Z\u00e1znam dat<\/strong><br \/>\nPro ka\u017edou zkou\u0161ku se zaznamen\u00e1 po\u010det vrstev a hodnota stupnice. V\u00fdsledky, kter\u00e9 vykazuj\u00ed abnorm\u00e1ln\u00ed dr\u00e1hy trh\u00e1n\u00ed nebo odchylky od zam\u00fd\u0161len\u00e9 linie trh\u00e1n\u00ed, se vy\u0159ad\u00ed podle standardn\u00edch krit\u00e9ri\u00ed.<\/p>\n<hr \/>\n<h2>B\u011b\u017en\u00e9 probl\u00e9my p\u0159i testov\u00e1n\u00ed podle normy ASTM D689 a jak se jim vyhnout<\/h2>\n<p>&nbsp;<\/p>\n<p data-start=\"4577\" data-end=\"4648\">Navzdory sv\u00e9 jednoduchosti vy\u017eaduje norma ASTM D689 pe\u010dlivou pozornost v\u011bnovanou detail\u016fm.<\/p>\n<p data-start=\"4650\" data-end=\"4672\">Mezi nej\u010dast\u011bj\u0161\u00ed probl\u00e9my pat\u0159\u00ed:<\/p>\n<ul data-start=\"4674\" data-end=\"4865\">\n<li data-start=\"4674\" data-end=\"4739\">\n<p data-start=\"4676\" data-end=\"4739\"><strong data-start=\"4676\" data-end=\"4703\">Nespr\u00e1vn\u00e1 volba vrstvy<\/strong>, co\u017e vede k odchylk\u00e1m v nam\u011b\u0159en\u00fdch hodnot\u00e1ch<\/p>\n<\/li>\n<li data-start=\"4740\" data-end=\"4797\">\n<p data-start=\"4742\" data-end=\"4797\"><strong data-start=\"4742\" data-end=\"4768\">Nesouosost ve svork\u00e1ch<\/strong>, co\u017e zp\u016fsobuje nerovnom\u011brn\u00e9 dr\u00e1hy slz<\/p>\n<\/li>\n<li data-start=\"4798\" data-end=\"4865\">\n<p data-start=\"4800\" data-end=\"4865\"><strong data-start=\"4800\" data-end=\"4838\">Nekonzistentn\u00ed orientace na stran\u011b dr\u00e1tu<\/strong>, ovliv\u0148uj\u00edc\u00ed opakovatelnost<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4867\" data-end=\"5042\">Aby se minimalizovaly chyby, m\u011bly by laborato\u0159e rutinn\u011b ov\u011b\u0159ovat kalibraci p\u0159\u00edstroj\u016f, dodr\u017eovat po\u017eadavky na manipulaci se vzorky a vy\u0159azovat neplatn\u00e9 v\u00fdsledky, jak je definov\u00e1no v norm\u011b.<\/p>\n<hr \/>\n<h2 data-start=\"5049\" data-end=\"5108\">V\u00fdb\u011br Elmendorfova trhac\u00edho testu pro spln\u011bn\u00ed normy ASTM D689<\/h2>\n<figure id=\"attachment_7701\" aria-describedby=\"caption-attachment-7701\" style=\"width: 209px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.qualitester.com\/cs\/produkt-2\/sld-01-elimendorf-tear-resistance-testing-machine\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-7701\" src=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Tear-Tester-SLD-01-239x300.jpg\" alt=\"Zkou\u0161ka pevnosti pap\u00edru v tahu\" width=\"209\" height=\"262\" srcset=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Tear-Tester-SLD-01-239x300.jpg 239w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Tear-Tester-SLD-01-10x12.jpg 10w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/12\/Tear-Tester-SLD-01.jpg 318w\" sizes=\"(max-width: 209px) 100vw, 209px\" \/><\/a><figcaption id=\"caption-attachment-7701\" class=\"wp-caption-text\">Tester slz SLD-01<\/figcaption><\/figure>\n<p data-start=\"5110\" data-end=\"5305\">Zat\u00edmco norma ASTM D689 se zam\u011b\u0159uje sp\u00ed\u0161e na metodiku ne\u017e na zna\u010dky za\u0159\u00edzen\u00ed, tester mus\u00ed spl\u0148ovat kl\u00ed\u010dov\u00e9 po\u017eadavky na v\u00fdkon, v\u010detn\u011b p\u0159esnosti kyvadla, stabiln\u00edho upnut\u00ed a p\u0159esn\u00e9ho rozli\u0161en\u00ed stupnice.<\/p>\n<p data-start=\"5110\" data-end=\"5305\">\n<p data-start=\"5307\" data-end=\"5626\">Modern\u00ed Elmendorfovy slzn\u00e9 testery, jako nap\u0159. <strong data-start=\"5350\" data-end=\"5377\"><a href=\"http:\/\/celtec.cn\" rel=\"nofollow noopener\" target=\"_blank\">Cell Instruments<\/a> <a href=\"https:\/\/www.qualitester.com\/cs\/produkt-2\/sld-01-elimendorf-tear-resistance-testing-machine\/\">SLD-01<\/a><\/strong>, jsou navr\u017eeny tak, aby podporovaly testov\u00e1n\u00ed podle normy ASTM D689 d\u00edky kontrolovan\u00e9mu uvol\u0148ov\u00e1n\u00ed kyvadla, jasn\u00e9 \u010ditelnosti stupnice a p\u0159izp\u016fsobiteln\u00e9mu up\u00edn\u00e1n\u00ed vzork\u016f.<\/p>\n<p data-start=\"5307\" data-end=\"5626\">Tyto vlastnosti pom\u00e1haj\u00ed laborato\u0159\u00edm zachovat konzistenci p\u0159i pou\u017e\u00edv\u00e1n\u00ed normy pro r\u016fzn\u00e9 typy pap\u00edru.<\/p>\n<p data-start=\"5307\" data-end=\"5626\">\n<p data-start=\"5307\" data-end=\"5626\">\n<hr \/>\n<h2 data-start=\"5388\" data-end=\"5870\">Z\u00e1v\u011br<\/h2>\n<p data-start=\"5648\" data-end=\"6000\">Na str\u00e1nk\u00e1ch <strong data-start=\"5652\" data-end=\"5690\">Zkou\u0161ka pevnosti pap\u00edru v tahu podle normy ASTM D689<\/strong> z\u016fst\u00e1v\u00e1 z\u00e1kladn\u00ed metodou pro hodnocen\u00ed odolnosti proti vnit\u0159n\u00edmu trh\u00e1n\u00ed pap\u00edrov\u00fdch materi\u00e1l\u016f. Dodr\u017eov\u00e1n\u00edm stanoven\u00fdch zku\u0161ebn\u00edch postup\u016f, zaji\u0161t\u011bn\u00edm spr\u00e1vn\u00e9 p\u0159\u00edpravy vzorku a pochopen\u00edm princip\u016f Elmendorfova testeru odolnosti proti roztr\u017een\u00ed mohou laborato\u0159e z\u00edskat p\u0159esn\u00e9 a srovnateln\u00e9 \u00fadaje o odolnosti proti roztr\u017een\u00ed.<\/p>\n<p data-start=\"6002\" data-end=\"6177\">P\u0159i spr\u00e1vn\u00e9m pou\u017eit\u00ed poskytuje norma ASTM D689 cenn\u00fd p\u0159ehled o vlastnostech pap\u00edru, podporuje kontrolu kvality, v\u00fdvoj v\u00fdrobk\u016f a shodu s o\u010dek\u00e1v\u00e1n\u00edm pr\u016fmyslu.<\/p>\n<h2>Nej\u010dast\u011bj\u0161\u00ed dotazy<\/h2>\n<p data-start=\"166\" data-end=\"445\"><strong data-start=\"166\" data-end=\"201\">Ot\u00e1zka 1: K \u010demu se pou\u017e\u00edv\u00e1 norma ASTM D689?<\/strong><br data-start=\"201\" data-end=\"204\" \/><strong data-start=\"204\" data-end=\"210\">A:<\/strong> Norma ASTM D689 definuje <strong data-start=\"233\" data-end=\"261\">zkou\u0161ka pevnosti pap\u00edru v tahu<\/strong> pomoc\u00ed Elmendorfova trhac\u00edho testu. M\u011b\u0159\u00ed <strong data-start=\"310\" data-end=\"350\">vnit\u0159n\u00ed odolnost pap\u00edru proti roztr\u017een\u00ed<\/strong> a pom\u00e1h\u00e1 p\u0159edv\u00eddat, jak se bude pap\u00edr chovat p\u0159i zpracov\u00e1n\u00ed, tisku nebo kone\u010dn\u00e9m pou\u017eit\u00ed.<\/p>\n<p data-start=\"447\" data-end=\"702\"><strong data-start=\"447\" data-end=\"505\">Ot\u00e1zka 2: Jak\u00e9 typy pap\u00edru lze testovat podle normy ASTM D689?<\/strong><br data-start=\"505\" data-end=\"508\" \/><strong data-start=\"508\" data-end=\"514\">A:<\/strong> Norma se vztahuje na v\u011bt\u0161inu druh\u016f pap\u00edru, v\u010detn\u011b tiskov\u00fdch, obalov\u00fdch a speci\u00e1ln\u00edch pap\u00edr\u016f. Nen\u00ed vhodn\u00e1 pro vysoce sm\u011brov\u00e9 desky, kde je kritick\u00e9 p\u0159\u00ed\u010dn\u00e9 trh\u00e1n\u00ed.<\/p>\n<p data-start=\"704\" data-end=\"943\"><strong data-start=\"704\" data-end=\"744\">Ot\u00e1zka 3: Kolik vrstev by se m\u011blo testovat?<\/strong><br data-start=\"744\" data-end=\"747\" \/><strong data-start=\"747\" data-end=\"753\">A:<\/strong> Po\u010det vrstev se vol\u00ed tak, aby se energie trh\u00e1n\u00ed bl\u00ed\u017eila 40% pln\u00e9ho rozsahu p\u0159\u00edstroje. T\u00edm se zajist\u00ed p\u0159esn\u00e9 ode\u010dty bez p\u0159et\u00ed\u017een\u00ed Elmendorfova trhac\u00edho testeru.<\/p>\n<p data-start=\"945\" data-end=\"1195\"><strong data-start=\"945\" data-end=\"990\">Ot\u00e1zka 4: Pro\u010d je kondicionov\u00e1n\u00ed vzorku d\u016fle\u017eit\u00e9?<\/strong><br data-start=\"990\" data-end=\"993\" \/><strong data-start=\"993\" data-end=\"999\">A:<\/strong> Pap\u00edr mus\u00ed b\u00fdt upraven za standardn\u00edch atmosf\u00e9rick\u00fdch podm\u00ednek, aby se stabilizoval obsah vlhkosti. T\u00edm se zabr\u00e1n\u00ed variabilit\u011b v\u00fdsledk\u016f odolnosti proti roztr\u017een\u00ed zp\u016fsoben\u00e9 kol\u00eds\u00e1n\u00edm vlhkosti nebo teploty.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Zkou\u0161ka pevnosti pap\u00edru v tahu podle Elmendorfovy normy ASTM D689 Zkou\u0161ka pevnosti pap\u00edru v tahu definovan\u00e1 v norm\u011b ASTM D689 je obecn\u011b uzn\u00e1vanou metodou pro hodnocen\u00ed vnit\u0159n\u00ed odolnosti pap\u00edru proti roztr\u017een\u00ed. Sp\u00ed\u0161e ne\u017e na m\u011b\u0159en\u00ed poru\u0161en\u00ed v tahu se tato zkou\u0161ka zam\u011b\u0159uje na schopnost materi\u00e1lu odol\u00e1vat \u0161\u00ed\u0159en\u00ed trh\u00e1n\u00ed po po\u010d\u00e1te\u010dn\u00edm roz\u0159\u00edznut\u00ed, co\u017e p\u0159esn\u011b odr\u00e1\u017e\u00ed skute\u010dn\u00e9 po\u0161kozen\u00ed ...<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.qualitester.com\/cs\/applications\/paper-tear-strength-test\/\"> <span class=\"screen-reader-text\">Zkou\u0161ka pevnosti pap\u00edru v tahu<\/span> Pokra\u010dovat ve \u010dten\u00ed \"<\/a><\/p>","protected":false},"author":8,"featured_media":0,"parent":6794,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"class_list":["post-7691","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/7691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/comments?post=7691"}],"version-history":[{"count":0,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/7691\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/6794"}],"wp:attachment":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/media?parent=7691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}