{"id":10305,"date":"2026-04-22T16:23:36","date_gmt":"2026-04-22T08:23:36","guid":{"rendered":"https:\/\/www.packqc.com\/?post_type=standard&#038;p=10305"},"modified":"2026-04-22T16:23:37","modified_gmt":"2026-04-22T08:23:37","slug":"astm-d2732","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/sk\/standard\/astm-d2732\/","title":{"rendered":"ASTM D2732"},"content":{"rendered":"<h2 class=\"wp-block-heading\">\u010co je ASTM D2732 a pre\u010do je d\u00f4le\u017eit\u00e1<\/h2>\n\n\n\n<p><strong>ASTM D2732<\/strong> definuje \u0161tandardizovan\u00fd pr\u00edstup k hodnoteniu <strong>neobmedzen\u00e9 line\u00e1rne tepeln\u00e9 zmr\u0161\u0165ovanie<\/strong> z plastovej f\u00f3lie a f\u00f3lie (hr\u00fabka \u22640,76 mm). Z praktick\u00e9ho h\u013eadiska t\u00e1to met\u00f3da kvantifikuje, ako ve\u013emi sa f\u00f3lia zmr\u0161t\u00ed, ke\u010f je vystaven\u00e1 zv\u00fd\u0161enej teplote <strong>bez vonkaj\u0161\u00edch obmedzen\u00ed<\/strong>.<\/p>\n\n\n\n<p>Po\u010das v\u00fdroby f\u00f3lie - ako je vytl\u00e1\u010danie alebo orient\u00e1cia -<strong>do \u0161trukt\u00fary materi\u00e1lu sa vn\u00e1\u0161aj\u00fa vn\u00fatorn\u00e9 nap\u00e4tia<\/strong>. Pri p\u00f4soben\u00ed tepla sa tieto nap\u00e4tia uvo\u013enia, \u010do vedie k rozmerov\u00e9mu zmr\u0161teniu. Pochopenie tohto spr\u00e1vania je rozhoduj\u00face pre:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Integrita balenia<\/strong> (napr. zmr\u0161\u0165ovacie f\u00f3lie, etikety)<\/li>\n\n\n\n<li><strong>V\u00fdkonnos\u0165 tesnenia v lek\u00e1rskych obaloch<\/strong><\/li>\n\n\n\n<li><strong>Rozmerov\u00e1 stabilita priemyseln\u00fdch f\u00f3li\u00ed<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Norma ASTM D2732 poskytuje opakovate\u013en\u00fd r\u00e1mec<\/strong> na meranie zmr\u0161tenia pri r\u00f4znych teplot\u00e1ch, \u010do umo\u017e\u0148uje in\u017einierom a t\u00edmom kontroly kvality korelova\u0165 v\u00fdkon s podmienkami spracovania.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sk\u00fa\u0161obn\u00e1 met\u00f3da tepeln\u00e9ho zmr\u0161\u0165ovania<\/h2>\n\n\n\n<p>The <strong>sk\u00fa\u0161obn\u00e1 met\u00f3da tepeln\u00e9ho zmr\u0161\u0165ovania<\/strong> op\u00edsan\u00e1 v norme ASTM D2732 sa zameriava na kontrolovan\u00fa tepeln\u00fa expoz\u00edciu v prostred\u00ed kvapaln\u00e9ho k\u00fape\u013ea.<\/p>\n\n\n\n<p>Medzi hlavn\u00e9 technick\u00e9 princ\u00edpy patria:<\/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 mechanick\u00fdch z\u00e1sahov.<\/li>\n\n\n\n<li><strong>Tepeln\u00e1 rovnov\u00e1ha:<\/strong> Vzorka mus\u00ed dosiahnu\u0165 stabiln\u00fa teplotu, aby sa dosiahlo maxim\u00e1lne zmr\u0161tenie.<\/li>\n\n\n\n<li><strong>Obojsmern\u00e9 meranie:<\/strong> Zmr\u0161tenie sa hodnot\u00ed v oboch pr\u00edpadoch <strong>smerovanie stroja (MD)<\/strong> a <strong>prie\u010dny smer (TD)<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p><strong>Kritick\u00fd poh\u013ead:<\/strong> Zmr\u0161\u0165ovanie nie je kon\u0161tantn\u00e9 - v\u00fdrazne sa men\u00ed v z\u00e1vislosti od teploty. Preto testovanie pri viacer\u00fdch teplotn\u00fdch bodoch poskytuje <strong>profil zmr\u0161tenia<\/strong>, nie len jednu hodnotu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Postup sk\u00fa\u0161ky zmr\u0161tenia<\/h2>\n\n\n\n<p>\u0160tandardizovan\u00fd <strong>postup sk\u00fa\u0161ky zmr\u0161tenia<\/strong> zabezpe\u010duje presnos\u0165 a reprodukovate\u013enos\u0165:<\/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>Rez <strong>Vzorky 100 mm \u00d7 100 mm<\/strong><\/li>\n\n\n\n<li>Pou\u017eite aspo\u0148 <strong>dve vzorky na jednu sk\u00fa\u0161obn\u00fa teplotu<\/strong><\/li>\n\n\n\n<li>V pr\u00edpade potreby ozna\u010dte smer stroja<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Vykonanie testu<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Umiestnite vzorku do <strong>Bezplatn\u00fd dr\u017eiak na zmr\u0161\u0165ovanie<\/strong> vyhn\u00fa\u0165 sa obmedzeniu<\/li>\n\n\n\n<li>Z\u00e1znam teploty k\u00fape\u013ea pred ponoren\u00edm<\/li>\n\n\n\n<li>Vzorku ponorte na <strong>~10 sek\u00fand<\/strong> (alebo do dosiahnutia rovnov\u00e1hy)<\/li>\n\n\n\n<li>Okam\u017eite preneste do chladiaceho m\u00e9dia<\/li>\n\n\n\n<li>Meranie kone\u010dn\u00fdch rozmerov po stabiliz\u00e1cii<\/li>\n<\/ol>\n\n\n\n<p><strong>D\u00f4le\u017eit\u00e9 bezpe\u010dnostn\u00e9 opatrenia:<\/strong><\/p>\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>Zabezpe\u010denie rovnomern\u00e9ho rozlo\u017eenia teploty v k\u00fapeli<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00fdpo\u010det zmr\u0161tenia<\/h3>\n\n\n\n<p><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><mi>S<\/mi><mi>h<\/mi><mi>r<\/mi><mi>i<\/mi><mi>n<\/mi><mi>k<\/mi><mi>a<\/mi><mi>g<\/mi><mi>e<\/mi><mo stretchy=\"false\">(<\/mo><mi mathvariant=\"normal\">%<\/mi><mo stretchy=\"false\">)<\/mo><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\">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>Kde:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><msub><mi>L<\/mi><mn>0<\/mn><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">L_0<\/annotation><\/semantics><\/math>L0: Po\u010diato\u010dn\u00e1 d\u013a\u017eka (zvy\u010dajne 100 mm)<\/li>\n\n\n\n<li><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><mrow><msub><mi>L<\/mi><mi>f<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">L_f<\/annotation><\/semantics><\/math>Lf: Kone\u010dn\u00e1 d\u013a\u017eka po zmr\u0161ten\u00ed<\/li>\n<\/ul>\n\n\n\n<p>Tento vzorec poskytuje <strong>percento line\u00e1rneho zmr\u0161tenia<\/strong>, \u010do je k\u013e\u00fa\u010dov\u00fd parameter na porovn\u00e1vanie materi\u00e1lov a kontrolu kvality.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tester zmr\u0161\u0165ovania bez f\u00f3lie: Zlep\u0161enie presnosti testov<\/h2>\n\n\n\n<p>A <strong><a href=\"https:\/\/www.packqc.com\/sk\/products\/fst-01-film-shrinkage-tester\/\" target=\"_blank\" data-type=\"products\" data-id=\"9536\" rel=\"noreferrer noopener\">tester zmr\u0161\u0165ovania bez f\u00f3lie<\/a><\/strong> je nevyhnutn\u00fd na presn\u00e9 vykonanie normy ASTM D2732. V porovnan\u00ed s manu\u00e1lnym nastaven\u00edm pon\u00fakaj\u00fa \u0161pecializovan\u00e9 pr\u00edstroje:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stabiln\u00e1 regul\u00e1cia teploty (\u00b10,3 \u00b0C)<\/strong><\/li>\n\n\n\n<li><strong>Rovnomern\u00fd ohrev prostredn\u00edctvom kvapaln\u00e9ho m\u00e9dia<\/strong><\/li>\n\n\n\n<li><strong>Riaden\u00e9 na\u010dasovanie ponorenia<\/strong><\/li>\n\n\n\n<li><strong>St\u00e1le podmienky bez obmedzen\u00ed<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Napr\u00edklad <strong>Cell Instruments <a href=\"https:\/\/www.packqc.com\/sk\/products\/fst-01-film-shrinkage-tester\/\" target=\"_blank\" rel=\"noreferrer noopener\">FST-01 Tester zmr\u0161\u0165ovania bez f\u00f3lie<\/a><\/strong> umo\u017e\u0148uje laborat\u00f3ri\u00e1m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Simulujte podmienky zmr\u0161\u0165ovania v re\u00e1lnom svete<\/li>\n\n\n\n<li>Generovanie opakovate\u013en\u00fdch \u00fadajov o zmr\u0161ten\u00ed<\/li>\n\n\n\n<li>Zn\u00ed\u017eenie variability sp\u00f4sobenej oper\u00e1torom<\/li>\n<\/ul>\n\n\n\n<p>Jeho <strong>PID-riaden\u00fd vykurovac\u00ed syst\u00e9m a \u0161tandardizovan\u00e9 pr\u00edslu\u0161enstvo<\/strong> zabezpe\u010di\u0165 s\u00falad s normou ASTM D2732 a z\u00e1rove\u0148 zv\u00fd\u0161i\u0165 prev\u00e1dzkov\u00fa efekt\u00edvnos\u0165.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">K\u013e\u00fa\u010dov\u00e9 faktory ovplyv\u0148uj\u00face v\u00fdsledky normy ASTM D2732<\/h2>\n\n\n\n<p>Na spr\u00e1vnu interpret\u00e1ciu v\u00fdsledkov zv\u00e1\u017ete tieto premenn\u00e9:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Zlo\u017eenie materi\u00e1lu<\/h3>\n\n\n\n<p>R\u00f4zne polym\u00e9ry (PET, PVC, PE) sa vyzna\u010duj\u00fa odli\u0161n\u00fdm zmr\u0161\u0165ovac\u00edm spr\u00e1van\u00edm v d\u00f4sledku molekulovej orient\u00e1cie a kry\u0161talinity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Hist\u00f3ria spracovania<\/h3>\n\n\n\n<p>Pomery na\u0165ahovania f\u00f3lie, r\u00fdchlosti chladenia a \u017e\u00edhania priamo ovplyv\u0148uj\u00fa <strong>zvy\u0161kov\u00e9 \u00farovne nap\u00e4tia<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u0924\u093e\u092a V\u00fdber teploty<\/h3>\n\n\n\n<p>Testovanie pri viacer\u00fdch teplot\u00e1ch odhalilo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Za\u010diatok zmr\u0161\u0165ovania<\/li>\n\n\n\n<li>Maxim\u00e1lny bod zmr\u0161tenia<\/li>\n\n\n\n<li>Spr\u00e1vanie pri tepelnom prechode<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Hr\u00fabka a \u0161trukt\u00fara<\/h3>\n\n\n\n<p>Silnej\u0161ie alebo viacvrstvov\u00e9 filmy m\u00f4\u017eu vy\u017eadova\u0165 dlh\u0161\u00ed \u010das ponorenia na dosiahnutie rovnov\u00e1hy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u010dasto kladen\u00e9 ot\u00e1zky<\/h2>\n\n\n\n<p>1. Ak\u00e9 materi\u00e1ly s\u00fa vhodn\u00e9 na testovanie pod\u013ea normy ASTM D2732?<br>Plastov\u00e9 f\u00f3lie a dosky s hr\u00fabkou \u22640,76 mm vr\u00e1tane PET, PE, PVC a viacvrstvov\u00fdch lamin\u00e1tov.<\/p>\n\n\n\n<p>2. Pre\u010do je d\u00f4le\u017eit\u00e9 neobmedzen\u00e9 zmr\u0161\u0165ovanie?<br>Odr\u00e1\u017ea vn\u00fatorn\u00e9 spr\u00e1vanie materi\u00e1lu bez vonkaj\u0161\u00edch s\u00edl a poskytuje <strong>skuto\u010dn\u00e9 charakteristiky zmr\u0161tenia<\/strong>.<\/p>\n\n\n\n<p>3. Ako dlho by mali by\u0165 vzorky ponoren\u00e9?<br>Zvy\u010dajne 10 sek\u00fand, ale hrub\u0161ie alebo nov\u00e9 materi\u00e1ly m\u00f4\u017eu vy\u017eadova\u0165 overenie, aby sa zabezpe\u010dilo \u00fapln\u00e9 zmr\u0161tenie.<\/p>\n\n\n\n<p>4. Ak\u00fd je rozdiel medzi zmr\u0161\u0165ovan\u00edm MD a TD?<br>MD (smer stroja) je v s\u00falade so smerom v\u00fdroby f\u00f3lie, zatia\u013e \u010do TD je kolm\u00fd - obidva maj\u00fa r\u00f4zny vplyv na v\u00fdkon.<\/p>\n\n\n\n<p>5. M\u00f4\u017ee <a href=\"https:\/\/store.astm.org\/d2732-14r25.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ASTM D2732<\/a> pou\u017ei\u0165 na zmr\u0161\u0165ovanie na b\u00e1ze rozp\u00fa\u0161\u0165adla?<br>Nie, nezoh\u013ead\u0148uje zmr\u0161tenie sp\u00f4soben\u00e9 stratou rozp\u00fa\u0161\u0165adla.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Norma ASTM D2732 hodnot\u00ed neobmedzen\u00e9 line\u00e1rne tepeln\u00e9 zmr\u0161\u0165ovanie plastov\u00fdch f\u00f3li\u00ed meran\u00edm rozmerov\u00fdch zmien po riadenom zahrievan\u00ed.<\/p>","protected":false},"featured_media":10306,"parent":0,"template":"","meta":{"_acf_changed":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","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":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"standard-category":[],"class_list":["post-10305","standard","type-standard","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/standard\/10305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/media\/10306"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/media?parent=10305"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/sk\/wp-json\/wp\/v2\/standard-category?post=10305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}