{"id":6737,"date":"2025-07-09T10:52:25","date_gmt":"2025-07-09T02:52:25","guid":{"rendered":"https:\/\/www.qualitester.com\/?page_id=6737"},"modified":"2025-07-09T10:56:51","modified_gmt":"2025-07-09T02:56:51","slug":"astm-f1921","status":"publish","type":"page","link":"https:\/\/www.qualitester.com\/cs\/standards\/astm-f1921\/","title":{"rendered":"ASTM F1921"},"content":{"rendered":"<h1 style=\"padding-left: 40px; text-align: center;\">ASTM D1921<br \/>\n<small>Testov\u00e1n\u00ed za tepla<\/small><\/h1>\n<p>V modern\u00edm balen\u00ed, zejm\u00e9na u vysokorychlostn\u00edch aplikac\u00ed typu \u201eform-fill-seal\u201c (FFS), je zaji\u0161t\u011bn\u00ed pevnosti termoplastick\u00fdch f\u00f3li\u00ed v hork\u00e9m stavu z\u00e1sadn\u00ed pro zabr\u00e1n\u011bn\u00ed selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed p\u0159i manipulaci. Zku\u0161ebn\u00ed metoda ASTM F1921 poskytuje standardizovan\u00fd postup pro m\u011b\u0159en\u00ed pevnosti tepeln\u00fdch svar\u016f p\u0159ed jejich ochlazen\u00edm. Tato p\u0159\u00edru\u010dka popisuje, jak prov\u00e1d\u011bt zkou\u0161ku p\u0159ilnavosti za tepla podle normy ASTM F1921 a jak p\u0159\u00edstroje, jako je tester p\u0159ilnavosti za tepla od spole\u010dnosti Cell Instruments, podporuj\u00ed konzistentn\u00ed a spolehliv\u00e9 testov\u00e1n\u00ed.<\/p>\n<hr \/>\n<h2>Porozum\u011bn\u00ed norm\u011b ASTM F1921: \u00da\u010del a v\u00fdznam<\/h2>\n<p>ASTM F1921 je \u0161iroce uzn\u00e1van\u00e1 norma vypracovan\u00e1 organizac\u00ed ASTM International, kter\u00e1 slou\u017e\u00ed ke stanoven\u00ed pevnosti tepeln\u00e9ho spoje u termoplastick\u00fdch f\u00f3li\u00ed pou\u017e\u00edvan\u00fdch v oblasti flexibiln\u00edch obal\u016f. V procesech typu \u201eform-fill-seal\u201c (tvarov\u00e1n\u00ed, pln\u011bn\u00ed a uzav\u00edr\u00e1n\u00ed) jsou spoje \u010dasto nam\u00e1h\u00e1ny je\u0161t\u011b v tepl\u00e9m stavu. Slab\u00fd tepeln\u00fd spoj se m\u016f\u017ee protrhnout, co\u017e m\u016f\u017ee v\u00e9st ke ztr\u00e1t\u011b produktu, selh\u00e1n\u00ed obalu nebo kontaminaci.<\/p>\n<p>Tento test je nezbytn\u00fd pro in\u017een\u00fdry v oboru balen\u00ed, v\u00fdrobce f\u00f3li\u00ed a t\u00fdmy kontroly kvality, aby:<\/p>\n<ul>\n<li>Vyhodnotit a porovnat v\u00fdkon filmu<\/li>\n<li>Optimalizujte podm\u00ednky ut\u011bsn\u011bn\u00ed<\/li>\n<li>Zajistit konzistentnost proces\u016f a integritu v\u00fdrobk\u016f<\/li>\n<\/ul>\n<hr \/>\n<h2>Vysv\u011btlen\u00ed zkou\u0161ky p\u0159ilnavosti za tepla a pevnosti p\u0159ilnavosti za tepla<\/h2>\n<p data-start=\"1619\" data-end=\"1887\">Na str\u00e1nk\u00e1ch <strong data-start=\"1623\" data-end=\"1640\">zkou\u0161ka p\u0159ilnavosti za tepla<\/strong> m\u011b\u0159\u00ed maxim\u00e1ln\u00ed s\u00edlu pot\u0159ebnou k roztr\u017een\u00ed tepeln\u00e9ho spoje, dokud je je\u0161t\u011b hork\u00fd. Tato vlastnost, zn\u00e1m\u00e1 jako <strong data-start=\"1750\" data-end=\"1771\">pevnost p\u0159i lepen\u00ed za tepla<\/strong>, odr\u00e1\u017e\u00ed schopnost materi\u00e1lu dr\u017eet pohromad\u011b bezprost\u0159edn\u011b po ut\u011bsn\u011bn\u00ed \u2013 je\u0161t\u011b p\u0159ed \u00faplnou krystalizac\u00ed nebo ochlazen\u00edm.<\/p>\n<p data-start=\"1889\" data-end=\"1936\">V r\u00e1mci t\u00e9to oblasti existuj\u00ed dva p\u0159\u00edstupy k testov\u00e1n\u00ed <a href=\"https:\/\/store.astm.org\/f1921-98.html\" target=\"_blank\" rel=\"noopener nofollow\">ASTM F1921<\/a>:<\/p>\n<ul>\n<li data-start=\"1939\" data-end=\"2050\"><strong data-start=\"1939\" data-end=\"1965\">Metoda A (pevn\u00e9 zpo\u017ed\u011bn\u00ed)<\/strong>: P\u0159ed odd\u011blen\u00edm uzav\u0159en\u00e9ho vzorku svorkami se uplatn\u00ed zpo\u017ed\u011bn\u00ed stanoven\u00e9 v\u00fdrobcem.<\/li>\n<li data-start=\"2053\" data-end=\"2160\"><strong data-start=\"2053\" data-end=\"2082\">Metoda B (prom\u011bnn\u00e9 zpo\u017ed\u011bn\u00ed)<\/strong>: Vyu\u017e\u00edv\u00e1 u\u017eivatelem definovan\u00e1 zpo\u017ed\u011bn\u00ed, co\u017e poskytuje v\u011bt\u0161\u00ed flexibilitu p\u0159i pr\u00e1ci s r\u016fzn\u00fdmi materi\u00e1ly.<\/li>\n<\/ul>\n<hr \/>\n<h2>Z\u00e1kladn\u00ed postup zkou\u0161en\u00ed podle normy ASTM F1921<\/h2>\n<p data-start=\"2214\" data-end=\"2266\">Proces testov\u00e1n\u00ed se skl\u00e1d\u00e1 z n\u00e1sleduj\u00edc\u00edch krok\u016f:<\/p>\n<ol>\n<li data-start=\"2271\" data-end=\"2297\"><strong data-start=\"2271\" data-end=\"2295\">P\u0159\u00edprava vzork\u016f<\/strong>\n<ul>\n<li>\u0160\u00ed\u0159ka: 15 mm, 25 mm nebo 1 palec<\/li>\n<li>D\u00e9lka: 25\u201335 cm<\/li>\n<li>Sm\u011br: Pod\u00e9ln\u00fd nebo p\u0159\u00ed\u010dn\u00fd sm\u011br (mus\u00ed b\u00fdt zdokumentov\u00e1no)<\/li>\n<li>Nejm\u00e9n\u011b 3\u20135 vzork\u016f pro ka\u017edou podm\u00ednku<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"2477\" data-end=\"2498\"><strong data-start=\"2477\" data-end=\"2496\">Proces ut\u011bs\u0148ov\u00e1n\u00ed<\/strong>\n<ul>\n<li>Vyh\u0159\u00edvan\u00e9 \u010delisti vyv\u00edjej\u00ed tlak na dva p\u0159ekr\u00fdvaj\u00edc\u00ed se pruhy f\u00f3lie<\/li>\n<li>Typick\u00e9 doby zdr\u017een\u00ed:<\/li>\n<li>vrstvy \u2264 25 \u03bcm: 0,5 s<\/li>\n<li>F\u00f3lie o tlou\u0161\u0165ce 25\u201364 \u03bcm: 1,0 s<\/li>\n<li>Tlak: 15\u201330 N\/cm\u00b2<\/li>\n<li>Teplota: Za\u010d\u00edn\u00e1 na teplot\u011b zah\u00e1jen\u00ed ut\u011bsn\u011bn\u00ed a zvy\u0161uje se o 5\u201310 \u00b0C p\u0159i ka\u017ed\u00e9 zkou\u0161ce<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"2775\" data-end=\"2805\"><strong data-start=\"2775\" data-end=\"2803\">Separace a m\u011b\u0159en\u00ed<\/strong>\n<ul>\n<li>Po zape\u010det\u011bn\u00ed se \u010delisti otev\u0159ou a up\u00ednac\u00ed prvky automaticky rozt\u00e1hnou pe\u010de\u0165 konstantn\u00ed rychlost\u00ed<\/li>\n<li>Stroj zaznamen\u00e1v\u00e1 <strong data-start=\"2939\" data-end=\"2978\">s\u00edla pot\u0159ebn\u00e1 k uvoln\u011bn\u00ed t\u011bsn\u011bn\u00ed<\/strong> (pevnost v p\u0159ilnavosti za tepla)<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3005\" data-end=\"3026\"><strong data-start=\"3005\" data-end=\"3024\">Sb\u011br dat<\/strong>\n<ul>\n<li>Pro ka\u017edou teplotu se vygeneruje k\u0159ivka p\u0159ilnavosti za tepla<\/li>\n<li>Zp\u016fsoby poruchy (odlupov\u00e1n\u00ed, delaminace, prota\u017een\u00ed, roztr\u017een\u00ed) se vizu\u00e1ln\u011b kontroluj\u00ed a dokumentuj\u00ed<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<div class=\"ast-oembed-container\" style=\"height: 100%;\"><iframe title=\"Co je to tester p\u0159ilnavosti za tepla | ASTM F1921 | Tester p\u0159ilnavosti za tepla a odtrhov\u00e9 pevnosti\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/BrWEqIbLUgI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<hr \/>\n<h2>Porozum\u011bn\u00ed k\u0159ivk\u00e1m \u201ehot tack\u201c<\/h2>\n<p data-start=\"3219\" data-end=\"3342\">A <strong data-start=\"3221\" data-end=\"3239\">k\u0159ivka tepeln\u00e9 p\u0159ilnavosti<\/strong> je grafick\u00e9 zn\u00e1zorn\u011bn\u00ed pevnosti t\u011bsn\u011bn\u00ed v ur\u010dit\u00e9m teplotn\u00edm rozmez\u00ed. Tyto k\u0159ivky pom\u00e1haj\u00ed ur\u010dit:<\/p>\n<ul>\n<li data-start=\"3345\" data-end=\"3375\">Optim\u00e1ln\u00ed teploty t\u011bsn\u011bn\u00ed<\/li>\n<li data-start=\"3378\" data-end=\"3398\">V\u00fdvoj v\u00fdkonnosti<\/li>\n<li data-start=\"3401\" data-end=\"3449\">Materi\u00e1lov\u00e1 omezen\u00ed p\u0159i vysok\u00fdch nebo n\u00edzk\u00fdch teplot\u00e1ch<\/li>\n<\/ul>\n<p data-start=\"3451\" data-end=\"3610\">Spr\u00e1vn\u00e1 anal\u00fdza k\u0159ivky m\u016f\u017ee pomoci konstrukt\u00e9r\u016fm obal\u016f p\u0159i v\u00fdb\u011bru vhodn\u00fdch materi\u00e1l\u016f a p\u0159i \u00faprav\u011b nastaven\u00ed stroj\u016f, aby se sn\u00ed\u017eila poruchovost ve v\u00fdrob\u011b.<\/p>\n<hr \/>\n<h2 data-start=\"3451\" data-end=\"3610\">\u010cast\u00e9 poruchy a selh\u00e1n\u00ed t\u011bsn\u011bn\u00ed<\/h2>\n<p>Ru\u0161en\u00ed, jako nap\u0159\u00edklad <strong data-start=\"3683\" data-end=\"3699\">delaminace<\/strong>, <strong data-start=\"3701\" data-end=\"3722\">ne\u00fapln\u00e1 f\u00faze<\/strong>, nebo <strong data-start=\"3727\" data-end=\"3747\">p\u0159enos povlaku<\/strong> m\u016f\u017ee zkreslit v\u00fdsledky. Norma ASTM F1921 klade d\u016fraz na zdokumentov\u00e1n\u00ed zp\u016fsobu poru\u0161en\u00ed ka\u017ed\u00e9ho vzorku, aby byla zaji\u0161t\u011bna p\u0159esn\u00e1 interpretace vlastnost\u00ed p\u0159ilnavosti za tepla.<\/p>\n<hr \/>\n<h2>Doporu\u010den\u00e9 vybaven\u00ed: <a href=\"https:\/\/www.qualitester.com\/cs\/\">Cell Instruments<\/a> Tester za tepla<\/h2>\n<p data-start=\"3964\" data-end=\"4158\"><a href=\"https:\/\/www.qualitester.com\/cs\/produkt-2\/heat-seal-material-film-hot-tack-property-test\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-6746 size-medium\" src=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08-300x300.webp\" alt=\"ASTM F1921\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08-300x300.webp 300w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08-150x150.webp 150w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08-12x12.webp 12w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08-100x100.webp 100w, https:\/\/www.qualitester.com\/wp-content\/uploads\/2025\/07\/HTT-25.07.08.webp 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>Chcete-li prov\u00e9st p\u0159esn\u00e9 a opakovateln\u00e9 <strong data-start=\"3998\" data-end=\"4012\">ASTM F1921<\/strong> V oblasti testov\u00e1n\u00ed nab\u00edz\u00ed spole\u010dnost Cell Instruments pln\u011b automatizovan\u00e9 <strong data-start=\"4064\" data-end=\"4083\">zkou\u0161e\u010dka lepivosti za tepla<\/strong> navr\u017eeno tak, aby spl\u0148ovalo a p\u0159ekra\u010dovalo standardn\u00ed specifikace. Mezi kl\u00ed\u010dov\u00e9 vlastnosti pat\u0159\u00ed:<\/p>\n<ul>\n<li data-start=\"4162\" data-end=\"4243\">Dv\u011b vyh\u0159\u00edvan\u00e9 \u010delisti s p\u0159esn\u00fdm nastaven\u00edm <strong data-start=\"4200\" data-end=\"4241\">teplota, doba p\u016fsoben\u00ed a tlak<\/strong><\/li>\n<li data-start=\"4246\" data-end=\"4314\">Automatizovan\u00fd cyklus ut\u011bsn\u011bn\u00ed a vyta\u017een\u00ed s funkc\u00ed v re\u00e1ln\u00e9m \u010dase <strong data-start=\"4291\" data-end=\"4312\">m\u011b\u0159en\u00ed s\u00edly<\/strong><\/li>\n<li data-start=\"4317\" data-end=\"4400\">U\u017eivatelsky p\u0159\u00edv\u011btiv\u00e9 rozhran\u00ed s programovateln\u00fdmi re\u017eimy zpo\u017ed\u011bn\u00ed pro <strong data-start=\"4375\" data-end=\"4398\">jak metoda A, tak metoda B<\/strong><\/li>\n<li data-start=\"4403\" data-end=\"4481\">Vytvo\u0159en\u00ed <strong data-start=\"4417\" data-end=\"4436\">k\u0159ivky s vysokou p\u0159ilnavost\u00ed<\/strong> a statistick\u00e9 \u00fadaje pro zaji\u0161t\u011bn\u00ed kvality<\/li>\n<\/ul>\n<p data-start=\"4483\" data-end=\"4624\">D\u00edky sv\u00e9 vysok\u00e9 p\u0159esnosti a reprodukovatelnosti je tento p\u0159\u00edstroj ide\u00e1ln\u00ed pro <strong data-start=\"4552\" data-end=\"4574\">v\u00fdrobci f\u00f3li\u00ed<\/strong>, <strong data-start=\"4576\" data-end=\"4593\">v\u00fdzkum a v\u00fdvoj v oblasti balen\u00ed<\/strong>, a <strong data-start=\"4599\" data-end=\"4623\">laborato\u0159e pro kontrolu kvality<\/strong>.<\/p>\n<hr \/>\n<h2 data-start=\"4483\" data-end=\"4624\">Osv\u011bd\u010den\u00e9 postupy pro p\u0159esn\u00e9 testov\u00e1n\u00ed p\u0159ilnavosti za tepla<\/h2>\n<ul>\n<li data-start=\"4683\" data-end=\"4759\">Filmy v\u017edy zkontrolujte, zda neobsahuj\u00ed vady, jako jsou skvrny nebo z\u00e1\u0159ezy \u2013 vadn\u00e9 vzorky vy\u0159a\u010fte<\/li>\n<li data-start=\"4762\" data-end=\"4818\">Zajist\u011bte, aby byly podm\u00ednky ut\u011bsn\u011bn\u00ed ve v\u0161ech opakov\u00e1n\u00edch stejn\u00e9<\/li>\n<li data-start=\"4821\" data-end=\"4886\">Ve zpr\u00e1v\u00e1ch jasn\u011b uve\u010fte sm\u011br t\u011bsn\u011bn\u00ed a rozm\u011bry vzorku<\/li>\n<li data-start=\"4889\" data-end=\"4956\">Pro v\u00fdpo\u010det pr\u016fm\u011bru pou\u017eijte alespo\u0148 t\u0159i opakov\u00e1n\u00ed pro ka\u017ed\u00fd teplotn\u00ed bod<\/li>\n<li data-start=\"4959\" data-end=\"5025\">Vyhn\u011bte se chyb\u00e1m zp\u016fsoben\u00fdm pasivn\u00edm p\u0159\u00edstupem \u2013 ru\u010dn\u011b zkontrolujte v\u0161echny mo\u017en\u00e9 zp\u016fsoby selh\u00e1n\u00ed u ka\u017ed\u00e9ho vzorku<\/li>\n<\/ul>\n<hr \/>\n<h2>Z\u00e1v\u011br<\/h2>\n<p data-start=\"5048\" data-end=\"5504\">Norma ASTM F1921 stanov\u00ed komplexn\u00ed a opakovatelnou metodiku pro posuzov\u00e1n\u00ed <strong data-start=\"5125\" data-end=\"5146\">pevnost p\u0159i lepen\u00ed za tepla<\/strong> v termoplastick\u00fdch obalov\u00fdch f\u00f3li\u00edch. Dodr\u017eov\u00e1n\u00edm t\u00e9to normy mohou odborn\u00edci na kontrolu kvality zajistit odolnost obal\u016f p\u0159i vysokorychlostn\u00edm zpracov\u00e1n\u00ed a manipulaci. Pou\u017e\u00edv\u00e1n\u00edm p\u0159esn\u00fdch za\u0159\u00edzen\u00ed, jako jsou <strong data-start=\"5347\" data-end=\"5384\">Cell Instruments' <a href=\"https:\/\/www.qualitester.com\/cs\/produkt-2\/hot-tack-tester-htt-02\/\">zkou\u0161e\u010dka lepivosti za tepla<\/a><\/strong> je\u0161t\u011b v\u00edce zvy\u0161uje konzistenci test\u016f, co\u017e usnad\u0148uje v\u00fdvoj spolehliv\u00fdch a vysoce v\u00fdkonn\u00fdch \u0159e\u0161en\u00ed v oblasti flexibiln\u00edch obal\u016f.<\/p>","protected":false},"excerpt":{"rendered":"<p>ASTM D1921 Hot Tack Testing In modern packaging, especially for high-speed form-fill-seal (FFS) applications, ensuring the hot tack strength of thermoplastic films is vital to prevent seal failures during handling. The ASTM F1921 test method provides a standardized procedure for measuring the strength of heat seals before they have cooled. This guide explores how to &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.qualitester.com\/cs\/standards\/astm-f1921\/\"> <span class=\"screen-reader-text\">ASTM F1921<\/span> Pokra\u010dovat ve \u010dten\u00ed \"<\/a><\/p>","protected":false},"author":3,"featured_media":0,"parent":4948,"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-6737","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/6737","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\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/comments?post=6737"}],"version-history":[{"count":0,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/6737\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/pages\/4948"}],"wp:attachment":[{"href":"https:\/\/www.qualitester.com\/cs\/wp-json\/wp\/v2\/media?parent=6737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}