{"id":535,"date":"2025-07-01T08:51:12","date_gmt":"2025-07-01T08:51:12","guid":{"rendered":"https:\/\/www.coefficientfriction.com\/?page_id=535"},"modified":"2025-07-01T09:09:37","modified_gmt":"2025-07-01T09:09:37","slug":"tappi-t549","status":"publish","type":"page","link":"https:\/\/www.coefficientfriction.com\/th\/tappi-t549","title":{"rendered":"TAPPI T549"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"535\" class=\"elementor elementor-535\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e87c6b2 e-flex e-con-boxed e-con e-parent\" data-id=\"e87c6b2\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-d087c52 e-con-full e-flex e-con e-child\" data-id=\"d087c52\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d9f31fd elementor-invisible elementor-widget elementor-widget-image\" data-id=\"d9f31fd\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;zoomIn&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"200\" src=\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/TAPPI-T549.webp\" class=\"attachment-large size-large wp-image-540\" alt=\"TAPPI T549\" srcset=\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/TAPPI-T549.webp 600w, https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/TAPPI-T549-300x100.webp 300w, https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/2025\/07\/TAPPI-T549-18x6.webp 18w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0e3633c elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"0e3633c\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;zoomIn&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Coefficients of static and kinetic friction of uncoated writing and printing paper by use of the horizontal plane method<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-60fbb6b e-con-full e-flex e-con e-child\" data-id=\"60fbb6b\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a73bac6 elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"a73bac6\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"361\" data-end=\"945\">In the paper and packaging industry, understanding surface interactions is essential for ensuring smooth performance in printing, converting, and handling processes. <a href=\"https:\/\/www.coefficientfriction.com\/th\/tappi-t549\"><em data-start=\"587\" data-end=\"599\">TAPPI T549<\/em><\/a> is the recognized method for determining the <strong data-start=\"645\" data-end=\"692\">static and kinetic coefficients of friction<\/strong> of paper when sliding against itself. This standard is especially important for <strong data-start=\"773\" data-end=\"791\">printing paper<\/strong> and <strong data-start=\"796\" data-end=\"816\">uncoated writing<\/strong> grades, where issues like sheet feeding and double-feeding can significantly affect product quality and equipment functionality.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0364755 e-flex e-con-boxed e-con e-parent\" data-id=\"0364755\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f673fbc elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"f673fbc\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Importance of Coefficient of Friction Testing in Paper<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-156f03e elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"156f03e\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1170\" data-end=\"1502\"><strong data-start=\"1262\" data-end=\"1295\">Coefficient of friction (COF)<\/strong> testing is a crucial metric that indicates how easily sheets of paper slide over each other. TAPPI T549 specifically focuses on the <strong data-start=\"1428\" data-end=\"1455\">horizontal plane method<\/strong>, offering a quantitative way to evaluate both:<\/p><ul><li data-start=\"1506\" data-end=\"1582\"><strong data-start=\"1506\" data-end=\"1540\">Static coefficient of friction<\/strong>: the force needed to initiate movement.<\/li><li data-start=\"1585\" data-end=\"1673\"><strong data-start=\"1585\" data-end=\"1613\">Kinetic friction testing<\/strong>: the force needed to maintain movement at a constant speed.<\/li><\/ul><p data-start=\"1675\" data-end=\"1932\">These values are critical in <strong data-start=\"1704\" data-end=\"1722\">printing paper<\/strong> and <strong data-start=\"1727\" data-end=\"1747\">uncoated writing<\/strong> applications, particularly in sheet-fed presses and copiers. Too low a COF can result in double-feeding, while too high a COF might cause jams or resistance in paper transport systems.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-eb10f5e e-flex e-con-boxed e-con e-parent\" data-id=\"eb10f5e\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-38e9bd9 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"38e9bd9\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Test Procedure: How to Perform a TAPPI T549 Test<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b4a43e8 e-con-full e-flex e-con e-child\" data-id=\"b4a43e8\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-949eee6 elementor-widget__width-inherit elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"949eee6\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInLeft&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ol><li><strong data-start=\"2632\" data-end=\"2647\">Preparation<\/strong><br data-start=\"2647\" data-end=\"2650\" \/>Place the <a href=\"https:\/\/www.coefficientfriction.com\/th\/coefficient-of-friction-testing-equipment\/\"><strong data-start=\"2663\" data-end=\"2706\">coefficient of friction testing machine<\/strong><\/a> on a stable, vibration-free surface. Level the equipment and zero the force measurement system.<\/li><li><strong data-start=\"2807\" data-end=\"2829\">Specimen Alignment<\/strong><ul><li data-start=\"2837\" data-end=\"2929\">Cut the samples according to grain direction (machine direction or cross-machine direction).<\/li><li data-start=\"2935\" data-end=\"3014\">Place the larger specimen (felt side up) on the horizontal plane and secure it.<\/li><li data-start=\"3020\" data-end=\"3122\">Position the smaller sample (wire side down) under the sled, avoiding any premature horizontal motion.<\/li><\/ul><\/li><li data-start=\"3127\" data-end=\"3153\"><strong data-start=\"3127\" data-end=\"3151\">Static Friction Test<\/strong><ul><li data-start=\"3159\" data-end=\"3203\">Attach the sled to the motor or gauge cable.<\/li><li data-start=\"3209\" data-end=\"3306\">Start the device and record the <strong data-start=\"3241\" data-end=\"3263\">initial peak force<\/strong> as the <strong data-start=\"3271\" data-end=\"3305\">static coefficient of friction<\/strong>.<\/li><\/ul><\/li><li data-start=\"3311\" data-end=\"3338\"><strong data-start=\"3311\" data-end=\"3336\">Kinetic Friction Test<\/strong><ul><li data-start=\"3344\" data-end=\"3399\">Continue movement over approximately 130 mm (5 inches).<\/li><li data-start=\"3405\" data-end=\"3476\">Record the <strong data-start=\"3416\" data-end=\"3433\">average force<\/strong> over this distance as the <strong data-start=\"3460\" data-end=\"3475\">kinetic COF<\/strong>.<\/li><\/ul><\/li><li data-start=\"3481\" data-end=\"3500\"><strong data-start=\"3481\" data-end=\"3498\">Repeatability<\/strong><ul><li data-start=\"3506\" data-end=\"3571\">Do not reuse test pairs unless required for variable comparisons.<\/li><li data-start=\"3577\" data-end=\"3651\">Maintain consistent timing between sled placement and movement initiation.<\/li><\/ul><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-411534e e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"411534e\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInRight&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8bb79da elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"8bb79da\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Test Method Summary According to TAPPI T549<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8e5007c elementor-widget elementor-widget-text-editor\" data-id=\"8e5007c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"1939\" data-end=\"2065\">TAPPI T549 outlines a straightforward but precise horizontal sliding method:<\/p><ul><li data-start=\"2069\" data-end=\"2119\">One paper sample is attached to a flat test plane.<\/li><li data-start=\"2122\" data-end=\"2201\">A second sample is fixed to a sled with a standardized weight and surface area.<\/li><li data-start=\"2204\" data-end=\"2307\">The sled is pulled (or the plane moved beneath the sled) using a constant-speed motor or pulley system.<\/li><li data-start=\"2310\" data-end=\"2380\">The <strong data-start=\"2314\" data-end=\"2331\">maximum force<\/strong> before movement begins gives the <strong data-start=\"2365\" data-end=\"2379\">static COF<\/strong>.<\/li><li data-start=\"2383\" data-end=\"2457\">The <strong data-start=\"2387\" data-end=\"2404\">average force<\/strong> during steady movement provides the <strong data-start=\"2441\" data-end=\"2456\">kinetic COF<\/strong>.<\/li><\/ul><p data-start=\"2459\" data-end=\"2568\">This method allows consistent, reproducible testing\u2014ideal for quality control and production line evaluation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e43e1f1 elementor-widget__width-inherit elementor-invisible elementor-widget elementor-widget-video\" data-id=\"e43e1f1\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/NUgXENOz8J0&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;play_on_mobile&quot;:&quot;yes&quot;,&quot;mute&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;,&quot;_animation&quot;:&quot;fadeInRight&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f7106d9 e-flex e-con-boxed e-con e-parent\" data-id=\"f7106d9\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-694940d e-con-full e-flex e-con e-child\" data-id=\"694940d\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8ea1c6c e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"8ea1c6c\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInLeft&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f6ee6d5 elementor-widget elementor-widget-heading\" data-id=\"f6ee6d5\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Applications of TAPPI T549 in the Industry<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-663e3cc elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"663e3cc\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li data-start=\"3708\" data-end=\"3791\"><strong data-start=\"3708\" data-end=\"3726\">Printing Paper<\/strong>: Ensures efficient sheet feeding in high-speed printing presses.<\/li><li data-start=\"3794\" data-end=\"3883\"><strong data-start=\"3794\" data-end=\"3820\">Uncoated Writing Paper<\/strong>: Prevents sticking or misfeeds in copiers and office printers.<\/li><li data-start=\"3886\" data-end=\"4047\"><strong data-start=\"3886\" data-end=\"3907\">Packaging Quality<\/strong>: Though TAPPI T549 is for paper-to-paper testing, it complements inclined plane methods like TAPPI T815 for broader packaging applications.<\/li><\/ul><p data-start=\"4049\" data-end=\"4195\">By understanding friction behavior, manufacturers can modify surface properties or coatings to meet application needs and equipment compatibility.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b0586e5 e-con-full e-flex elementor-invisible e-con e-child\" data-id=\"b0586e5\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;fadeInRight&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-f9046cc e-con-full e-flex e-con e-child\" data-id=\"f9046cc\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c4f0b8e elementor-widget elementor-widget-heading\" data-id=\"c4f0b8e\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;none&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why TAPPI T549 Matters for Quality Control<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2186d6f elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"2186d6f\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4924\" data-end=\"4965\">Maintaining the right COF levels ensures:<\/p><ul><li data-start=\"4968\" data-end=\"5016\"><strong data-start=\"4968\" data-end=\"4992\">Smooth paper feeding<\/strong> in printers and copiers<\/li><li data-start=\"5019\" data-end=\"5073\"><strong data-start=\"5019\" data-end=\"5043\">Reduced machine wear<\/strong> due to fewer jams or misfeeds<\/li><li data-start=\"5076\" data-end=\"5128\"><strong data-start=\"5076\" data-end=\"5108\">Improved product consistency<\/strong> from batch to batch<\/li><li data-start=\"5131\" data-end=\"5198\"><strong data-start=\"5131\" data-end=\"5163\">Better customer satisfaction<\/strong> by avoiding common handling issues<\/li><\/ul><p data-start=\"5200\" data-end=\"5345\">TAPPI T549 provides the methodology to quantify friction behavior, offering data that drives smarter decisions in production and material design.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9d958da e-flex e-con-boxed e-con e-parent\" data-id=\"9d958da\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5055911 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"5055911\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">COF-01 Coefficient of Friction Testing Machine<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0424cfa e-con-full e-grid e-con e-child\" data-id=\"0424cfa\" data-element_type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a290580 e-con-full e-flex e-con e-child\" data-id=\"a290580\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7cac45b elementor-invisible elementor-widget elementor-widget-text-editor\" data-id=\"7cac45b\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"4274\" data-end=\"4439\">To comply with TAPPI T549 with precision and reliability, <strong data-start=\"4332\" data-end=\"4352\">Cell Instruments<\/strong> offers the <strong data-start=\"4364\" data-end=\"4414\">COF-01 Coefficient of Friction Testing Machine<\/strong>, specially designed for:<\/p><ul data-start=\"4441\" data-end=\"4617\"><li data-start=\"4441\" data-end=\"4476\"><p data-start=\"4443\" data-end=\"4476\">Static and kinetic COF evaluation<\/p><\/li><li data-start=\"4477\" data-end=\"4512\"><p data-start=\"4479\" data-end=\"4512\">Horizontal plane friction testing<\/p><\/li><li data-start=\"4513\" data-end=\"4617\"><p data-start=\"4515\" data-end=\"4617\">Application in <strong data-start=\"4530\" data-end=\"4548\">printing paper<\/strong>, <strong data-start=\"4550\" data-end=\"4570\">uncoated writing<\/strong>, and other <strong data-start=\"4582\" data-end=\"4607\">textile and packaging<\/strong> materials<\/p><\/li><\/ul><p data-start=\"4619\" data-end=\"4869\">Its constant-speed movement and digital force recording ensure TAPPI-standard results that are reproducible and highly accurate. For professionals in quality control or R&amp;D, the COF-01 ensures your testing aligns with TAPPI T549 and production goals.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3a3fc5c e-con-full e-flex e-con e-child\" data-id=\"3a3fc5c\" data-element_type=\"container\" data-settings=\"{&quot;animation&quot;:&quot;none&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9e1f2e3 elementor-invisible elementor-widget elementor-widget-image\" data-id=\"9e1f2e3\" data-element_type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.coefficientfriction.com\/th\/coefficient-of-friction-testing-equipment\/\">\n\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.coefficientfriction.com\/wp-content\/uploads\/elementor\/thumbs\/coefficient-of-friction-testing-equipment-01-r3gmfg1nwdb5s7ojc5fmiewgn0ak2nlwv641l9yiy0.webp\" title=\"coefficient of friction testing equipment 01\" alt=\"coefficient of friction testing equipment 01\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Coefficients of static and kinetic friction of uncoated writing and printing paper by use of the horizontal plane method In the paper and packaging industry, understanding surface interactions is essential for ensuring smooth performance in printing, converting, and handling processes. TAPPI T549 is the recognized method for determining the static and kinetic coefficients of friction [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-535","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/pages\/535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/comments?post=535"}],"version-history":[{"count":5,"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/pages\/535\/revisions"}],"predecessor-version":[{"id":552,"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/pages\/535\/revisions\/552"}],"wp:attachment":[{"href":"https:\/\/www.coefficientfriction.com\/th\/wp-json\/wp\/v2\/media?parent=535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}