{"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\/ro\/standard\/astm-d4917\/","title":{"rendered":"ASTM D4917"},"content":{"rendered":"<h2 class=\"wp-block-heading\">\u00cen\u021belegerea coeficientului de frecare \u00een testarea h\u00e2rtiei<\/h2>\n\n\n\n<p><strong data-start=\"1472\" data-end=\"1505\">Coeficientul de frecare (COF)<\/strong> este un parametru esen\u021bial care reflect\u0103 rezisten\u021ba la mi\u0219care dintre dou\u0103 suprafe\u021be. \u00cen aplica\u021biile cu h\u00e2rtie, aceast\u0103 valoare influen\u021beaz\u0103 modul \u00een care o foaie alunec\u0103 peste alta. Valoarea <strong data-start=\"1674\" data-end=\"1688\">COF static<\/strong> determin\u0103 for\u021ba necesar\u0103 pentru a \u00eencepe mi\u0219carea, \u00een timp ce <strong data-start=\"1752\" data-end=\"1767\">COF cinetic<\/strong> m\u0103soar\u0103 for\u021ba necesar\u0103 pentru a men\u021bine mi\u0219carea la o vitez\u0103 constant\u0103. ASTM D4917 permite ambele m\u0103sur\u0103tori folosind mi\u0219carea de alunecare orizontal\u0103.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Considera\u021bii privind echipamentul de testare \u0219i preg\u0103tirea probelor<\/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=\"Testul coeficientului de frecare a h\u00e2rtiei \u00een curs de desf\u0103\u0219urare\" 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>Pentru a efectua teste COF fiabile \u00een conformitate cu ASTM D4917, este esen\u021bial un echipament specializat. A <strong data-start=\"3843\" data-end=\"3877\">tester de vitez\u0103 constant\u0103 de mi\u0219care<\/strong>, echipat cu o celul\u0103 de sarcin\u0103 \u0219i capabil s\u0103 trag\u0103 o sanie cu 150 \u00b1 30 mm\/min, este utilizat de obicei.<\/p>\n\n\n\n<p>Pentru rezultate precise, probele trebuie s\u0103 fie precondi\u021bionate \u00een condi\u021bii atmosferice standard (conform TAPPI T402 sau ASTM D685) \u0219i preg\u0103tite \u00een conformitate cu direc\u021bia ma\u0219inii \u0219i orientarea gr\u0103un\u021bilor.<\/p>\n\n\n\n<p>Recomand\u0103m <strong data-start=\"4191\" data-end=\"4249\">Cell Instruments COF-01 Tester de coeficient de frecare<\/strong>, un instrument cu plan orizontal de \u00eenalt\u0103 precizie conceput pentru a \u00eendeplini cerin\u021bele ASTM D4917 \u0219i ISO 8295. Dispune de control digital, op\u021biuni reglabile pentru sanie \u0219i m\u0103surare automat\u0103 a for\u021bei - asigur\u00e2nd rezultate precise \u0219i reproductibile pentru testele COF statice \u0219i cinetice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Explicarea test\u0103rii fric\u021biunii statice \u0219i cinetice a h\u00e2rtiei<\/h2>\n\n\n\n<p>Testarea h\u00e2rtiei conform ASTM D4917 presupune plasarea unei foi de h\u00e2rtie pe o suprafa\u021b\u0103 orizontal\u0103 plan\u0103 \u0219i plasarea unei alte foi identice deasupra. O sanie (de obicei acoperit\u0103 cu cauciuc) este plasat\u0103 peste foaia superioar\u0103. Pe m\u0103sur\u0103 ce sania este tras\u0103, se m\u0103soar\u0103 for\u021ba necesar\u0103 pentru ini\u021bierea mi\u0219c\u0103rii (frecarea static\u0103) \u0219i for\u021ba necesar\u0103 pentru continuarea mi\u0219c\u0103rii (frecarea cinetic\u0103).<\/p>\n\n\n\n<p>Acest <strong data-start=\"2334\" data-end=\"2368\">testarea frec\u0103rii cinetice a h\u00e2rtiei<\/strong> \u015fi <strong data-start=\"2373\" data-end=\"2406\">testarea fric\u021biunii statice a h\u00e2rtiei<\/strong> ofer\u0103 date esen\u021biale pentru \u00een\u021belegerea separ\u0103rii foilor, a consisten\u021bei aliment\u0103rii \u0219i a alinierii imprim\u0103rii \u00een sistemele de mare vitez\u0103.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aplica\u021bii ale ASTM D4917 \u00een testarea COF a h\u00e2rtiei tip\u0103rite \u0219i neacoperite<\/h2>\n\n\n\n<p>The <strong data-start=\"2613\" data-end=\"2640\">h\u00e2rtie de imprimare Test COF<\/strong> este deosebit de important\u0103 \u00een mediile de tip\u0103rire, unde consisten\u021ba fric\u021biunii asigur\u0103 precizia aliment\u0103rii cu o singur\u0103 foaie \u0219i reduce blocajele sau aliment\u0103rile gre\u0219ite. \u00cen mod similar, <strong data-start=\"2799\" data-end=\"2826\">h\u00e2rtie neacoperit\u0103 Test COF<\/strong> ajut\u0103 produc\u0103torii de h\u00e2rtie s\u0103 verifice specifica\u021biile produselor \u00eenainte de conversie sau livrare.<\/p>\n\n\n\n<p>\u00cen ambele aplica\u021bii, ASTM D4917 ofer\u0103 o abordare standardizat\u0103 care reduce variabilitatea testelor \u0219i asigur\u0103 conformitatea cu standardele de calitate din industrie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">De ce s\u0103 folosi\u021bi ASTM D4917 \u00een loc de alte metode?<\/h2>\n\n\n\n<p>Spre deosebire de metodele cu plan \u00eenclinat (cum ar fi ASTM D4918), care nu pot determina COF cinetic, ASTM D4917 permite evaluarea precis\u0103 a fric\u021biunii statice \u0219i cinetice prin mi\u0219care orizontal\u0103. \u00cen plus, minimizeaz\u0103 uzura prin alunecare prin testarea numai la primul contact, ceea ce simuleaz\u0103 mai bine scenariile reale de manipulare a foilor.<\/p>\n\n\n\n<p>Pentru materiale mai rigide, cum ar fi cartonul ondulat, ASTM D4521 sau ASTM D3247 sunt mai adecvate. Dar pentru <strong data-start=\"3557\" data-end=\"3592\">h\u00e2rtii sub\u021biri, flexibile, neacoperite<\/strong>, D4917 este metoda de baz\u0103 recomandat\u0103 de majoritatea convertorilor de h\u00e2rtie \u0219i laboratoarelor de ambalare.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alegerea testerului de coeficient de frecare potrivit<\/h2>\n\n\n\n<p>Pentru a fi \u00een conformitate cu ASTM D4917 \u0219i pentru a ob\u021bine rezultate COF precise pe h\u00e2rtie, v\u0103 recomand\u0103m <strong data-start=\"4239\" data-end=\"4270\">Instrumente celulare <a href=\"https:\/\/www.packqc.com\/ro\/product\/coefficient-of-friction-testing-equipment\/\">COF-01<\/a> Tester<\/strong>, care este optimizat pentru:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>testare orizontal\u0103<\/li>\n\n\n\n<li>M\u0103surarea frec\u0103rii statice \u0219i cinetice<\/li>\n\n\n\n<li>Design personalizat pentru h\u00e2rtii neacoperite \u0219i speciale<\/li>\n\n\n\n<li>\u00cenregistrare inteligent\u0103 a datelor\u00a0<\/li>\n<\/ul>\n\n\n\n<p>Sus\u021binute de un suport tehnic \u0219i aplicativ solid, testerele de frecare Cell Instruments asigur\u0103 precizie \u0219i repetabilitate pe diferite substraturi de h\u00e2rtie.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Contacta\u021bi-ne Ob\u021bine\u021bi solu\u021bia de testare ASTM D4917 <\/h2>\n\n\n\n<p>Caracteristicile de frecare ale materialelor din h\u00e2rtie influen\u021beaz\u0103 \u00een mod semnificativ performan\u021ba \u00een opera\u021biunile de tip\u0103rire, ambalare \u0219i conversie. <strong data-start=\"5267\" data-end=\"5281\">ASTM D4917<\/strong> ofer\u0103 un cadru standardizat \u0219i fiabil pentru m\u0103surarea fric\u021biunii statice \u0219i cinetice a h\u00e2rtiei de scris \u0219i de tipar neacoperite. Cu instrumente precise precum <strong data-start=\"5448\" data-end=\"5478\">COF-01 de <a href=\"https:\/\/www.packqc.com\/ro\/\">Instrumente celulare<\/a><\/strong>, profesioni\u0219tii din domeniul calit\u0103\u021bii pot executa cu \u00eencredere teste, interpreta rezultatele \u0219i implementa \u00eembun\u0103t\u0103\u021biri.<\/p>\n\n\n\n<p>Fie c\u0103 testa\u021bi pentru <strong data-start=\"5608\" data-end=\"5634\">h\u00e2rtie frecare cinetic\u0103<\/strong>, <strong data-start=\"5636\" data-end=\"5655\">frecare static\u0103<\/strong>, <strong data-start=\"5657\" data-end=\"5679\">h\u00e2rtie de imprimare COF<\/strong>, sau efectuarea unei <strong data-start=\"5698\" data-end=\"5725\">h\u00e2rtie neacoperit\u0103 Test COF<\/strong>, \u00een\u021belegerea \u0219i aplicarea ASTM D4917 asigur\u0103 c\u0103 rezultatele dvs. sunt semnificative, reproductibile \u0219i aliniate la standardele globale.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00centreb\u0103ri frecvente<\/h2>\n\n\n\n<p><a tabindex=\"0\">1. Ce m\u0103soar\u0103 ASTM D4917?<\/a><br>ASTM D4917 m\u0103soar\u0103 coeficientul de frecare static\u0103 \u0219i cinetic\u0103 al h\u00e2rtiei de scris \u0219i de tipar neacoperite folosind o metod\u0103 pe plan orizontal.<\/p>\n\n\n\n<p><a tabindex=\"0\">2. De ce este important testul de frecare pentru produsele din h\u00e2rtie?<\/a><br>Frecarea afecteaz\u0103 fiabilitatea aliment\u0103rii imprimantelor \u0219i copiatoarelor \u0219i asigur\u0103 manipularea corespunz\u0103toare a utilajelor de conversie \u0219i ambalare.<\/p>\n\n\n\n<p><a tabindex=\"0\">3. Prin ce difer\u0103 COF static de COF cinetic?<\/a><br>COF static m\u0103soar\u0103 for\u021ba de ini\u021biere a mi\u0219c\u0103rii \u00eentre dou\u0103 suprafe\u021be, \u00een timp ce COF cinetic m\u0103soar\u0103 for\u021ba de continuare a acestei mi\u0219c\u0103ri.<\/p>\n\n\n\n<p><a tabindex=\"0\">4. Poate <\/a><a href=\"https:\/\/store.astm.org\/d4917-97r07e01.html\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ASTM D4917<\/a><a tabindex=\"0\"> s\u0103 fie utilizate pentru h\u00e2rtii cretate sau speciale?<\/a><br>De\u0219i este optimizat pentru h\u00e2rtii de scris \u0219i de tipar neacoperite, ASTM D4917 poate fi utilizat cu alte tipuri de h\u00e2rtie, de\u0219i rezultatele pot varia \u00een precizie.<\/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\/ro\/wp-json\/wp\/v2\/standard\/9845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.packqc.com\/ro\/wp-json\/wp\/v2\/standard"}],"about":[{"href":"https:\/\/www.packqc.com\/ro\/wp-json\/wp\/v2\/types\/standard"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.packqc.com\/ro\/wp-json\/wp\/v2\/media\/10018"}],"wp:attachment":[{"href":"https:\/\/www.packqc.com\/ro\/wp-json\/wp\/v2\/media?parent=9845"}],"wp:term":[{"taxonomy":"standard-category","embeddable":true,"href":"https:\/\/www.packqc.com\/ro\/wp-json\/wp\/v2\/standard-category?post=9845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}