{"id":3268,"date":"2026-04-22T08:44:19","date_gmt":"2026-04-22T08:44:19","guid":{"rendered":"https:\/\/www.materialstests.com\/?post_type=application&#038;p=3268"},"modified":"2026-04-23T02:13:48","modified_gmt":"2026-04-23T02:13:48","slug":"astm-d2732","status":"publish","type":"application","link":"https:\/\/www.materialstests.com\/sk\/application\/astm-d2732.html","title":{"rendered":"ASTM D2732"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Pochopenie normy ASTM D2732 a jej \u00falohy pri v\u00fdkone filmu<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ASTM D2732<\/strong> definuje \u0161tandardizovan\u00fa met\u00f3du na meranie <em>neobmedzen\u00e9 line\u00e1rne tepeln\u00e9 zmr\u0161\u0165ovanie<\/em> plastov\u00fdch f\u00f3li\u00ed a f\u00f3li\u00ed s hr\u00fabkou \u22640,76 mm. T\u00e1to met\u00f3da zohr\u00e1va rozhoduj\u00facu \u00falohu pri hodnoten\u00ed spr\u00e1vania sa f\u00f3li\u00ed pri vystaven\u00ed teplu - \u010do je d\u00f4le\u017eit\u00fd parameter v baliacich, lek\u00e1rskych a priemyseln\u00fdch aplik\u00e1ci\u00e1ch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Po\u010das v\u00fdroby f\u00f3lie v\u00fdrobcovia \u010dasto vn\u00e1\u0161aj\u00fa vn\u00fatorn\u00e9 nap\u00e4tie prostredn\u00edctvom procesov na\u0165ahovania alebo orient\u00e1cie. Pri vystaven\u00ed zv\u00fd\u0161enej teplote sa tieto nap\u00e4tia uvo\u013enia a sp\u00f4sobia rozmerov\u00e9 zmr\u0161tenie. Norma ASTM D2732 poskytuje kontrolovan\u00fd r\u00e1mec na presn\u00fa kvantifik\u00e1ciu tohto spr\u00e1vania.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tieto \u00fadaje umo\u017e\u0148uj\u00fa in\u017einierom a t\u00edmom kontroly kvality predpoveda\u0165 v\u00fdkon v re\u00e1lnych tepeln\u00fdch podmienkach a zabezpe\u010di\u0165, aby materi\u00e1ly sp\u013a\u0148ali po\u017eiadavky aplik\u00e1cie bez deform\u00e1ci\u00ed, por\u00fach alebo probl\u00e9mov s tesnen\u00edm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Testovanie zmr\u0161tenia a testovanie zmr\u0161\u0165ovac\u00edch f\u00f3li\u00ed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Testovanie zmr\u0161tenia<\/strong> pod\u013ea normy ASTM D2732 zah\u0155\u0148a ponorenie vzoriek f\u00f3lie do zahriateho kvapaln\u00e9ho m\u00e9dia na pozorovanie rozmerov\u00fdch zmien. Spo\u013eahliv\u00e9 <strong>tester zmr\u0161\u0165ovac\u00edch f\u00f3li\u00ed<\/strong> zabezpe\u010duje konzistentn\u00fa kontrolu teploty a opakovate\u013en\u00e9 v\u00fdsledky.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u013e\u00fa\u010dov\u00e9 z\u00e1sady testovania zah\u0155\u0148aj\u00fa:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stav bez obmedzenia:<\/strong> Vzorka sa mus\u00ed vo\u013ene zmr\u0161\u0165ova\u0165 bez vonkaj\u0161\u00edch s\u00edl<\/li>\n\n\n\n<li><strong>Tepeln\u00e1 rovnov\u00e1ha:<\/strong> Vzorka mus\u00ed po\u010das ponorenia dosiahnu\u0165 stabiln\u00fa teplotu<\/li>\n\n\n\n<li><strong>Smerov\u00e9 meranie:<\/strong> Zmr\u0161tenie sa zaznamen\u00e1va v smere stroja (MD) aj v prie\u010dnom smere (TD)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0160pecializovan\u00fd n\u00e1stroj, ako je napr. <strong>FST-01 Tester zmr\u0161\u0165ovania bez f\u00f3lie<\/strong> v\u00fdrazne zlep\u0161uje presnos\u0165 testovania. Pon\u00faka:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>PID regul\u00e1cia teploty (\u00b10,3 \u00b0C)<\/strong> na stabiln\u00e9 vykurovanie<\/li>\n\n\n\n<li>Rovnomern\u00e9 kvapaln\u00e9 m\u00e9dium na elimin\u00e1ciu teplotn\u00fdch gradientov<\/li>\n\n\n\n<li>Vo\u013ene zmr\u0161tite\u013en\u00e9 dr\u017eiaky na zabr\u00e1nenie mechanick\u00e9mu obmedzeniu<\/li>\n\n\n\n<li>Presn\u00e9 na\u010dasovanie pre konzistentn\u00e9 \u010dasy zdr\u017eania<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tieto vlastnosti s\u00fa priamo v s\u00falade s po\u017eiadavkami normy ASTM D2732 a zni\u017euj\u00fa variabilitu sp\u00f4soben\u00fa oper\u00e1torom.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sk\u00fa\u0161obn\u00fd postup pod\u013ea normy ASTM D2732<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Na zabezpe\u010denie zhody a opakovate\u013enosti sa laborat\u00f3ri\u00e1 riadia \u0161trukt\u00farovan\u00fdm postupom:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pr\u00edprava vzorky<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rezan\u00e9 vzorky na <strong>100 mm \u00d7 100 mm<\/strong><\/li>\n\n\n\n<li>Pripravte aspo\u0148 dve vzorky na ka\u017ed\u00fa teplotu testu<\/li>\n\n\n\n<li>V pr\u00edpade potreby ozna\u010dte orient\u00e1ciu (MD\/TD)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Kroky testovania<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Umiestnite vzorku do dr\u017eiaka s vo\u013en\u00fdm zmr\u0161\u0165ovan\u00edm<\/li>\n\n\n\n<li>Zaznamenajte teplotu k\u00fape\u013ea pred ponoren\u00edm<\/li>\n\n\n\n<li>Vzorku ponorte pribli\u017ene na <strong>10 sek\u00fand<\/strong><\/li>\n\n\n\n<li>Vyberte a okam\u017eite ochla\u010fte v tekutine izbovej teploty<\/li>\n\n\n\n<li>Meranie kone\u010dn\u00fdch rozmerov po stabiliz\u00e1cii<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00f4le\u017eit\u00e9 pozn\u00e1mky<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vyhnite sa predhrievaniu vzorky pred ponoren\u00edm<\/li>\n\n\n\n<li>Zabr\u00e1\u0148te roztiahnutiu vzorky po\u010das manipul\u00e1cie<\/li>\n\n\n\n<li>V pr\u00edpade potreby upravte \u010das ponorenia pre hrub\u0161ie materi\u00e1ly<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdpo\u010det v\u00fdsledkov zmr\u0161tenia<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Norma ASTM D2732 vyjadruje zmr\u0161tenie ako percento zmeny rozmerov:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mtext>Zmr\u0161tenie (%)<\/mtext><mo>=<\/mo><mfrac><mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><mo>\u2212<\/mo><msub><mi>L<\/mi><mi>f<\/mi><\/msub><\/mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><\/mfrac><mo>\u00d7<\/mo><mn>100<\/mn><\/mrow><annotation encoding=\"application\/x-tex\">\\text{Zmen\u0161enie (\\%)} = \\frac{L_0 - L_f}{L_0} \\kr\u00e1t 100<\/annotation><\/semantics><\/math>Zmr\u0161tenie (%)=L0L0-Lf\u00d7100<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kde:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>L\u2080<\/strong> = P\u00f4vodn\u00e1 d\u013a\u017eka (zvy\u010dajne 100 mm)<\/li>\n\n\n\n<li><strong>L_f<\/strong> = Kone\u010dn\u00e1 d\u013a\u017eka po zmr\u0161ten\u00ed<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tento v\u00fdpo\u010det poskytuje jasn\u00e9 kvantitat\u00edvne meranie spr\u00e1vania sa materi\u00e1lu pri tepelnom nam\u00e1han\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdznam normy ASTM D2732 pri kontrole kvality<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Norma ASTM D2732 poskytuje u\u017eito\u010dn\u00e9 inform\u00e1cie o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Konzistentnos\u0165 spracovania:<\/strong> zis\u0165ovanie odch\u00fdlok v orient\u00e1cii f\u00f3lie a v\u00fdrobn\u00fdch podmienkach<\/li>\n\n\n\n<li><strong>Tepeln\u00e1 stabilita:<\/strong> Identifik\u00e1cia prahov\u00fdch hodn\u00f4t zmr\u0161tenia v s\u00favislosti s prechodmi polym\u00e9rov<\/li>\n\n\n\n<li><strong>V\u00fdkonnos\u0165 kone\u010dn\u00e9ho pou\u017eitia:<\/strong> Zabezpe\u010denie neporu\u0161enosti obalu, najm\u00e4 pri aplik\u00e1ci\u00e1ch zmr\u0161\u0165ovania teplom<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Napr\u00edklad nadmern\u00e9 zmr\u0161\u0165ovanie m\u00f4\u017ee vies\u0165 k:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Skreslen\u00fd vzh\u013ead obalu<\/li>\n\n\n\n<li>Zlyhanie tesnenia v lek\u00e1rskych vreck\u00e1ch<\/li>\n\n\n\n<li>Mechanick\u00e9 nap\u00e4tie vo vrstven\u00fdch \u0161trukt\u00farach<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Testovan\u00edm pri viacer\u00fdch teplot\u00e1ch m\u00f4\u017eu in\u017einieri stanovi\u0165 <strong>krivka profilu zmr\u0161tenia<\/strong>, \u010do umo\u017e\u0148uje presn\u00fd v\u00fdber materi\u00e1lu a optimaliz\u00e1ciu procesu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pre\u010do si vybra\u0165 pokro\u010dil\u00e9 testovacie rie\u0161enia ako FST-01<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V praktickom laborat\u00f3rnom prostred\u00ed manu\u00e1lne met\u00f3dy \u010dasto sp\u00f4sobuj\u00fa nezrovnalosti. Na str\u00e1nke <strong>FST-01 <a href=\"https:\/\/www.materialstests.com\/sk\/products\/fst-01-film-free-shrink-tester.html\/\" target=\"_blank\" data-type=\"products\" data-id=\"3069\" rel=\"noreferrer noopener\">Tester zmr\u0161\u0165ovania bez f\u00f3lie<\/a><\/strong> rie\u0161i tieto v\u00fdzvy prostredn\u00edctvom:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Opakovate\u013en\u00e9 podmienky ohrevu<\/strong> naprie\u010d d\u00e1vkami<\/li>\n\n\n\n<li><strong>Zn\u00ed\u017eenie po\u010dtu \u013eudsk\u00fdch ch\u00fdb<\/strong> pri na\u010dasovan\u00ed a manipul\u00e1cii<\/li>\n\n\n\n<li><strong>Zv\u00fd\u0161en\u00e1 bezpe\u010dnos\u0165<\/strong> s uzavret\u00fdmi syst\u00e9mami olejov\u00fdch k\u00fape\u013eov<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Pre v\u00fdrobcov v oblasti balenia, farmaceutick\u00fdch v\u00fdrobkov a elektroniky tak\u00e9to pr\u00edstroje zabezpe\u010duj\u00fa s\u00falad s normou ASTM D2732 a z\u00e1rove\u0148 zvy\u0161uj\u00fa priepustnos\u0165 a spo\u013eahlivos\u0165.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aplik\u00e1cie testovania pod\u013ea normy ASTM D2732<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Priemyseln\u00e9 odvetvia sa spoliehaj\u00fa na ASTM D2732 pre:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pru\u017en\u00e9 obalov\u00e9 f\u00f3lie (PET, PE, PVC)<\/li>\n\n\n\n<li>Lek\u00e1rske a farmaceutick\u00e9 steriln\u00e9 bari\u00e9ry<\/li>\n\n\n\n<li>Teplom zmr\u0161tite\u013en\u00e9 obj\u00edmky a r\u00farky<\/li>\n\n\n\n<li>Priemyseln\u00e9 stre\u010dov\u00e9 a baliace f\u00f3lie<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">V ka\u017edom pr\u00edpade m\u00e1 zmr\u0161\u0165ovanie priamy vplyv na funk\u010dnos\u0165 a vizu\u00e1lnu kvalitu v\u00fdrobku.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. \u010co meria norma ASTM D2732?<\/strong><br>Meria neobmedzen\u00e9 line\u00e1rne tepeln\u00e9 zmr\u0161\u0165ovanie plastov\u00fdch f\u00f3li\u00ed pri vystaven\u00ed kontrolovan\u00fdm tepeln\u00fdm podmienkam.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Pre\u010do je testovanie zmr\u0161tenia d\u00f4le\u017eit\u00e9 pre obalov\u00e9 f\u00f3lie?<\/strong><br>Zabezpe\u010duje, aby si f\u00f3lie zachovali rozmerov\u00fa stabilitu a tesniacu celistvos\u0165 po\u010das tepeln\u00e9ho p\u00f4sobenia pri spracovan\u00ed alebo kone\u010dnom pou\u017eit\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Ak\u00e1 je \u0161tandardn\u00e1 ve\u013ekos\u0165 vzorky pod\u013ea normy ASTM D2732?<\/strong><br>\u0160tandardn\u00e1 ve\u013ekos\u0165 je 100 mm \u00d7 100 mm na presn\u00e9 a konzistentn\u00e9 meranie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Ako dlho m\u00e1 by\u0165 vzorka ponoren\u00e1?<\/strong><br>Zvy\u010dajne 10 sek\u00fand, ale hrub\u0161ie materi\u00e1ly m\u00f4\u017eu vy\u017eadova\u0165 overenie dostato\u010dnej tepelnej rovnov\u00e1hy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5. Ak\u00e9 vybavenie sa odpor\u00fa\u010da pre <a href=\"https:\/\/store.astm.org\/d2732-14r25.html\" target=\"_blank\" rel=\"noreferrer noopener\">ASTM D2732<\/a> testovanie?<\/strong><br>\u0160peci\u00e1lny tester zmr\u0161\u0165ovac\u00edch f\u00f3li\u00ed, ako je FST-01, zabezpe\u010duje presn\u00fa kontrolu teploty a opakovate\u013en\u00e9 v\u00fdsledky.<\/p>","protected":false},"excerpt":{"rendered":"<p>ASTM D2732 defines a standardized method to evaluate the unrestrained thermal shrinkage of plastic films by immersing specimens in a heated medium and measuring dimensional changes.<\/p>","protected":false},"featured_media":3270,"parent":0,"template":"","meta":{"_acf_changed":false},"standard":[1012],"class_list":["post-3268","application","type-application","status-publish","has-post-thumbnail","hentry","standard-astm"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/application\/3268","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/application"}],"about":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/types\/application"}],"version-history":[{"count":2,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/application\/3268\/revisions"}],"predecessor-version":[{"id":3271,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/application\/3268\/revisions\/3271"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/media\/3270"}],"wp:attachment":[{"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/media?parent=3268"}],"wp:term":[{"taxonomy":"standard","embeddable":true,"href":"https:\/\/www.materialstests.com\/sk\/wp-json\/wp\/v2\/standard?post=3268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}