{"id":9845,"date":"2026-02-24T15:11:45","date_gmt":"2026-02-24T07:11:45","guid":{"rendered":"https:\/\/www.packqc.com\/standard\/astm-d4917-2\/"},"modified":"2026-03-12T10:37:47","modified_gmt":"2026-03-12T02:37:47","slug":"astm-d4917","status":"publish","type":"standard","link":"https:\/\/www.packqc.com\/hr\/standard\/astm-d4917\/","title":{"rendered":"ASTM D4917"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Razumijevanje koeficijenta trenja pri ispitivanju papira<\/h2>\n\n\n\n<p><strong data-start=\"1472\" data-end=\"1505\">Koeficijent trenja (COF)<\/strong> je klju\u010dni parametar koji odra\u017eava otpor kretanju izme\u0111u dviju povr\u0161ina. U primjenama na papiru ova vrijednost utje\u010de na to kako se jedan list klizi preko drugog. <strong data-start=\"1674\" data-end=\"1688\">statik COF<\/strong> odre\u0111uje silu potrebnu za pokretanje kretanja, dok <strong data-start=\"1752\" data-end=\"1767\">kineti\u010dki COF<\/strong> Mjeri silu potrebnu za odr\u017eavanje kretanja pri konstantnoj brzini. ASTM D4917 omogu\u0107uje oba mjerenja koriste\u0107i horizontalno klizno kretanje.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Razmatranja vezana uz opremu za ispitivanje i pripremu uzoraka<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"ast-oembed-container\" style=\"height: 100%;\"><iframe title=\"U tijeku je test koeficijenta trenja papira\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Iq-UFiGqF64?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<\/div><\/figure>\n\n\n\n<p>Za provo\u0111enje pouzdanih COF testova prema ASTM D4917 neophodna je specijalizirana oprema. A <strong data-start=\"3843\" data-end=\"3877\">tester konstantne brzine kretanja<\/strong>, opremljen tenzometrijskom \u0107elijom i sposoban vu\u0107i sanke brzinom od 150 \u00b1 30 mm\/min, obi\u010dno se koristi.<\/p>\n\n\n\n<p>Za to\u010dne rezultate uzorci bi trebali biti predtretirani pod standardnim atmosferskim uvjetima (prema TAPPI T402 ili ASTM D685) i pripremljeni u skladu s pravcem stroja i orijentacijom vlakana.<\/p>\n\n\n\n<p>Preporu\u010dujemo <strong data-start=\"4191\" data-end=\"4249\">Cell Instruments COF-01 tester koeficijenta trenja<\/strong>, visokoprecizni instrument horizontalne ravnine dizajniran da zadovolji zahtjeve ASTM D4917 i ISO 8295. Ima digitalnu kontrolu, podesive opcije sanjki i automatizirano mjerenje sile\u2014osiguravaju\u0107i to\u010dne, reproducibilne rezultate za stati\u010dka i kineti\u010dka ispitivanja koeficijenta trenja.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Obja\u0161njenje ispitivanja stati\u010dkog i kineti\u010dkog trenja na papiru<\/h2>\n\n\n\n<p>Ispitivanje papira prema ASTM D4917 uklju\u010duje postavljanje jednog lista papira na ravnu vodoravnu povr\u0161inu i na njega postavljanje jo\u0161 jednog identi\u010dnog lista. Na gornji list postavlja se sanke (obi\u010dno oblo\u017eene gumom). Dok se sanke povla\u010de, mjere se sila potrebna za pokretanje kretanja (statisti\u010dko trenje) i sila potrebna za odr\u017eavanje kretanja (kineti\u010dko trenje).<\/p>\n\n\n\n<p>Ovaj <strong data-start=\"2334\" data-end=\"2368\">testiranje kineti\u010dkog trenja papira<\/strong> i <strong data-start=\"2373\" data-end=\"2406\">Ispitivanje stati\u010dkog trenja na papiru<\/strong> Pru\u017ea klju\u010dne podatke za razumijevanje odvajanja listova, konzistencije papira i poravnanja tiska u brzim sustavima.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Primjene norme ASTM D4917 u ispitivanju COF-a u tiskanju i na nekartiranom papiru<\/h2>\n\n\n\n<p>The <strong data-start=\"2613\" data-end=\"2640\">test COF-a papira za tisak<\/strong> je osobito va\u017ean u okru\u017eenjima tiskarske proizvodnje, gdje dosljednost trenja osigurava to\u010dnost uvoda pojedina\u010dnih listova i smanjuje zapinjanja ili pogre\u0161an uvod. Sli\u010dno tome, <strong data-start=\"2799\" data-end=\"2826\">test COF-a na nepremazanom papiru<\/strong> poma\u017ee proizvo\u0111a\u010dima papira provjeriti specifikacije proizvoda prije prerade ili isporuke.<\/p>\n\n\n\n<p>U oba slu\u010daja primjene, ASTM D4917 nudi standardizirani pristup koji smanjuje varijabilnost ispitivanja i osigurava uskla\u0111enost s industrijskim mjerilima kvalitete.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Za\u0161to koristiti ASTM D4917 umjesto drugih metoda?<\/h2>\n\n\n\n<p>Za razliku od metoda na nagnutoj ravnini (kao \u0161to je ASTM D4918), koje ne mogu odrediti kineti\u010dki koeficijent trenja, ASTM D4917 omogu\u0107uje preciznu procjenu stati\u010dkog i kineti\u010dkog trenja kroz horizontalno pomicanje. Nadalje, minimizira habanje klizanjem testiranjem samo pri prvom kontaktu, \u0161to bolje simulira stvarne scenarije rukovanja limovima.<\/p>\n\n\n\n<p>Za krutije materijale poput valovitog kartona, prikladniji su ASTM D4521 ili ASTM D3247. Ali za <strong data-start=\"3557\" data-end=\"3592\">tanki, fleksibilni, neprekriveni papiri<\/strong>, D4917 je preporu\u010dena metoda koju primjenjuje ve\u0107ina prera\u0111iva\u010da papira i pakirnih laboratorija.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Odabir pravog testerice koeficijenta trenja<\/h2>\n\n\n\n<p>Kako bi se udovoljilo normi ASTM D4917 i postigli precizni rezultati koeficijenta trenja papira, preporu\u010dujemo <strong data-start=\"4239\" data-end=\"4270\">Stani\u010dni instrumenti <a href=\"https:\/\/www.packqc.com\/hr\/product\/coefficient-of-friction-testing-equipment\/\">COF-01<\/a> Tester<\/strong>, \u0161to je optimizirano za:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>horizontalno testiranje<\/li>\n\n\n\n<li>Mjerenja stati\u010dkog i kineti\u010dkog trenja<\/li>\n\n\n\n<li>Prilago\u0111eni dizajn opreme za nekartirane i specijalne papire<\/li>\n\n\n\n<li>Pametno snimanje podataka\u00a0<\/li>\n<\/ul>\n\n\n\n<p>Podr\u017eani robusnim in\u017eenjerskim i aplikacijskim podr\u0161kom, Cell Instruments testeri trenja osiguravaju preciznost i ponovljivost na razli\u010ditim papirnatim podlogama.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kontaktirajte nas za rje\u0161enje za ispitivanje prema ASTM D4917 <\/h2>\n\n\n\n<p>Karakteristike trenja papirnih materijala zna\u010dajno utje\u010du na performanse u tiskarskim, pakirnim i pretvorbenim operacijama. <strong data-start=\"5267\" data-end=\"5281\">ASTM D4917<\/strong> Pru\u017ea standardizirani, pouzdani okvir za mjerenje stati\u010dkog i kineti\u010dkog trenja neprekrivenog papira za pisanje i tiskanje. Uz precizne instrumente poput <strong data-start=\"5448\" data-end=\"5478\">COF-01 od <a href=\"https:\/\/www.packqc.com\/hr\/\">Stani\u010dni instrumenti<\/a><\/strong>, kvalitetni stru\u010dnjaci mogu pouzdano provoditi testove, tuma\u010diti rezultate i provoditi pobolj\u0161anja.<\/p>\n\n\n\n<p>Bilo da testirate za <strong data-start=\"5608\" data-end=\"5634\">papir kineti\u010dko trenje<\/strong>, <strong data-start=\"5636\" data-end=\"5655\">statika trenja<\/strong>, <strong data-start=\"5657\" data-end=\"5679\">COF papira za tisak<\/strong>, ili provo\u0111enje <strong data-start=\"5698\" data-end=\"5725\">test COF-a na nepremazanom papiru<\/strong>, Razumijevanje i primjena norme ASTM D4917 osiguravaju da su va\u0161i rezultati smisleni, reproducibilni i uskla\u0111eni s globalnim standardima.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<p><a tabindex=\"0\">1. \u0160to mjeri ASTM D4917?<\/a><br>ASTM D4917 mjeri koeficijent stati\u010dkog i kineti\u010dkog trenja neprevle\u010denog pisanog i tiskarskog papira metodom horizontalne ravnine.<\/p>\n\n\n\n<p><a tabindex=\"0\">2. Za\u0161to je ispitivanje trenja va\u017eno za papirne proizvode?<\/a><br>Trljanje utje\u010de na pouzdanost dovoda u pisa\u010dima i fotokopirnim ure\u0111ajima te osigurava pravilno rukovanje u strojevima za preradu i pakiranje.<\/p>\n\n\n\n<p><a tabindex=\"0\">3. Kako se stati\u010dki COF razlikuje od kineti\u010dkog COF-a?<\/a><br>Stati\u010dki koeficijent trenja mjeri silu potrebnu za pokretanje gibanja izme\u0111u dviju povr\u0161ina, dok kineti\u010dki koeficijent trenja mjeri silu potrebnu za nastavak tog gibanja.<\/p>\n\n\n\n<p><a tabindex=\"0\">4. Mo\u017ee <\/a><a href=\"https:\/\/store.astm.org\/d4917-97r07e01.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ASTM D4917<\/a><a tabindex=\"0\"> mo\u017ee li se koristiti za premazane ili specijalne papire?<\/a><br>Iako je optimiziran za nepremazane papire za pisanje i tiskanje, ASTM D4917 se mo\u017ee koristiti i za druge vrste papira, iako se preciznost rezultata mo\u017ee razlikovati.<\/p>","protected":false},"excerpt":{"rendered":"<p>Understanding Coefficient of Friction in Paper Testing Coefficient of friction (COF) is a crucial parameter that reflects the resistance to motion between two surfaces. In paper applications, this value influences how one sheet slides over another. The static COF determines the force required to start the movement, while the kinetic COF measures the force needed [&hellip;]<\/p>","protected":false},"featured_media":10018,"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":"","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-9845","standard","type-standard","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/standard\/9845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/media\/10018"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/media?parent=9845"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/hr\/wp-json\/wp\/v2\/standard-category?post=9845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}