{"id":18612,"date":"2025-10-12T12:46:26","date_gmt":"2025-10-12T12:46:26","guid":{"rendered":"https:\/\/www.qualtechproductsindustry.com\/tappi-t-549-cof-of-paper-paperboard-with-the-horizontal-plane-method-discuss-the-specific-use-and-purpose-you-can-write-extensively-about-what-a-particular-astm-test-method-is-design\/"},"modified":"2025-10-19T18:37:25","modified_gmt":"2025-10-19T18:37:25","slug":"tappi-t-549","status":"publish","type":"post","link":"https:\/\/www.qualtechproductsindustry.com\/cy\/tappi-t-549\/","title":{"rendered":"TAPPI T 549 \u2014 Cyfernod Ffrithiant (COF) Papur a Bwrdd Papur: Defnydd, Pwrpas, a Gweledigaeth Ddiwydiannol"},"content":{"rendered":"<p>Pan fydd angen i chi fesur mor hawdd y mae papur neu gardbord yn llithro yn erbyn arwynebau, mae TAPPI T 549 yn darparu dull safonol y diwydiant ar gyfer pennu'r cyfernod ffrithiant (COF). Mae'r Prawf hwn yn defnyddio'r dull pl\u00e2n llorweddol i fesur y grym sydd ei angen i symud un deunydd ar draws un arall ar gyflymder cyson. Mae'r Prawf yn hanfodol ar gyfer\u2026 <\/p>\n<div class=\"pmpro\">\n<div class=\"pmpro_card pmpro_content_message\">\n<h2 class=\"pmpro_card_title pmpro_font-large\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"var(--pmpro--color--accent)\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" class=\"feather feather-lock\"><rect x=\"3\" y=\"11\" width=\"18\" height=\"11\" rx=\"2\" ry=\"2\"><\/rect><path d=\"M7 11V7a5 5 0 0 1 10 0v4\"><\/path><\/svg>Mae Angen Aelodaeth o'r Casgliad Mewnwelediadau a Chomentar<\/h2>\n<div class=\"pmpro_card_content\">\n<p> Rhaid i chi fod yn aelod o Gasgliad Mewnwelediadau a Chomentrau i gael mynediad at y cynnwys hwn.<\/p>\n<p><a class=\"pmpro_btn\" href=\"https:\/\/www.qualtechproductsindustry.com\/cy\/membership-checkout\/?pmpro_level=1\">Ymuno nawr<\/a><\/p>\n<\/div>\n<div class=\"pmpro_card_actions pmpro_font-medium\">Yn aelod yn barod? <a href=\"https:\/\/www.qualtechproductsindustry.com\/cy\/login\/?redirect_to=https%3A%2F%2Fwww.qualtechproductsindustry.com%2Fcy%2Ftappi-t-549%2F\">Mewngofnodwch yma<\/a><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>When you need to measure how easily paper or paperboard slides against surfaces, TAPPI T 549 provides the industry standard method for determining the coefficient of friction (COF). This test uses the horizontal plane method to measure the force needed to move one material across another at a constant speed. The test is essential for... <\/p>\n<div class=\"pmpro\"><div class=\"pmpro_card pmpro_content_message\"><h2 class=\"pmpro_card_title pmpro_font-large\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"var(--pmpro--color--accent)\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" class=\"feather feather-lock\"><rect x=\"3\" y=\"11\" width=\"18\" height=\"11\" rx=\"2\" ry=\"2\"><\/rect><path d=\"M7 11V7a5 5 0 0 1 10 0v4\"><\/path><\/svg>Mae Angen Aelodaeth o'r Casgliad Mewnwelediadau a Chomentar<\/h2><div class=\"pmpro_card_content\"><p> Rhaid i chi fod yn aelod o Gasgliad Mewnwelediadau a Chomentrau i gael mynediad at y cynnwys hwn.<\/p><p><a class=\"pmpro_btn\" href=\"https:\/\/www.qualtechproductsindustry.com\/cy\/membership-checkout\/?pmpro_level=1\">Ymuno nawr<\/a><\/p><\/div><div class=\"pmpro_card_actions pmpro_font-medium\">Yn aelod yn barod? <a href=\"https:\/\/www.qualtechproductsindustry.com\/cy\/login\/?redirect_to=https%3A%2F%2Fwww.qualtechproductsindustry.com%2Fcy%2Ftappi-t-549%2F\">Mewngofnodwch yma<\/a><\/div><\/div><\/div>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pmpro_default_level":"","footnotes":""},"categories":[534,543],"tags":[],"class_list":["post-18612","post","type-post","status-publish","format-standard","hentry","category-science","category-tappi","pmpro-level-required","pmpro-level-1","pmpro-no-access"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TAPPI T 549 \u2014 COF of Paper &amp; Paperboard: Use, Purpose, and Industry Insight - QUALTECH PRODUCTS INDUSTRY<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.qualtechproductsindustry.com\/cy\/tappi-t-549\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TAPPI T 549 \u2014 COF of Paper &amp; Paperboard: Use, Purpose, and Industry Insight - QUALTECH PRODUCTS INDUSTRY\" \/>\n<meta property=\"og:description\" content=\"When you need to measure how easily paper or paperboard slides against surfaces, TAPPI T 549 provides the industry standard method for determining the coefficient of friction (COF). 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