{"id":2862,"date":"2015-08-07T08:00:36","date_gmt":"2015-08-07T14:00:36","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=2862"},"modified":"2023-06-06T12:57:33","modified_gmt":"2023-06-06T18:57:33","slug":"pc-coil-coating-explained","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/2862\/pc-coil-coating-explained\/","title":{"rendered":"Coil Coating Explained"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\" size-full wp-image-2863 alignleft\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/08\/coil1.png\" alt=\"coil1\" width=\"180\" height=\"181\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil1.png 180w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil1-150x150.png 150w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil1-30x30.png 30w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil1-60x60.png 60w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil1-90x90.png 90w\" sizes=\"(max-width: 180px) 100vw, 180px\" \/>Over 800 million tons of <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=coil+coat&amp;st=31\" target=\"_blank\" rel=\"noopener\">coil-coated<\/a> metal are produced and shipped annually in North America alone. Coil coating (see Diagram I) is a very efficient way to produce a uniform, high quality, coated finish over metal in a continuous automated fashion. Coil coating is also referred to as pre-painted metal, because the metal is painted prior to, rather than after, fabrication.<\/p>\n<p>In the coil coating process, the metal coil is first unwound, cleaned and pre-treated, applied on a flat continuous sheet, heat cured, cooled and rewound for shipment. At the fabricator, it is then cut to the desired size and formed into its finished shape. Versus most other application methods, coil coating efficiency is nearly 100%. Application is at very high line speeds as modern coil lines can run at speeds as high as 700 feet per minute and cure the applied paint in 15 &#8211; 45 seconds. As opposed to a spray-applied coating, for example, a coil-coated, formed surface offers uniform film thickness rather than the thicker films on edges, corners and bends that is more typical of spray-applied coatings.<\/p>\n<figure id=\"attachment_2865\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 498px\"><a href=\"https:\/\/www.coilcoating.org\/how-to-paint-metal-coils\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2865 size-full\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/08\/coil2.png\" alt=\"Click to view source\" width=\"498\" height=\"260\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil2.png 498w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil2-300x157.png 300w\" sizes=\"(max-width: 498px) 100vw, 498px\" \/><\/a><figcaption class=\"caption wp-caption-text\">Diagram I &#8211; Typical Coil Coating Line. Click to view source.<\/figcaption><\/figure>\n<p><a href=\"#_ftnref1\" name=\"_ftn1\"><\/a>Topcoats are applied by reverse roll coat in which the applicator roll travels in the reverse direction of the strip and thus provides a smoother film with fewer defects. <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=primer&amp;st=31\" target=\"_blank\" rel=\"noopener\">Primers<\/a> and backers are normally applied by direct roll coating. Some lines also apply coil coatings using an extruder or via a solid block of paint with a softening point such that it can be applied smoothly when heated.<\/p>\n<figure id=\"attachment_2879\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 515px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2879\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/08\/Screen-Shot-2015-08-04-at-2.49.07-PM.png\" alt=\"Table I \u2013 Synopsis of Coil Coating Options and Benefits\" width=\"515\" height=\"406\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-04-at-2.49.07-PM.png 515w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-04-at-2.49.07-PM-300x237.png 300w\" sizes=\"(max-width: 515px) 100vw, 515px\" \/><figcaption class=\"caption wp-caption-text\">Table I \u2013 Synopsis of Coil Coating Options and Benefits<\/figcaption><\/figure>\n<figure id=\"attachment_2867\" class=\"thumbnail wp-caption alignleft\" style=\"width: 324px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2867\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/08\/coil4.png\" alt=\"Schematic I - Coil Coated Substrate \" width=\"324\" height=\"88\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil4.png 324w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/coil4-300x81.png 300w\" sizes=\"(max-width: 324px) 100vw, 324px\" \/><figcaption class=\"caption wp-caption-text\">Schematic I &#8211; Coil Coated Substrate<\/figcaption><\/figure>\n<p>The types of paint curing employed in the coil industry include thermal, infrared, induction and UV cure. By and large, the vast majority of coil coatings are cured using gas-fired ovens. Accordingly, the remaining portions of this article will focus on thermal-cured coil coatings. Coil primers and backers are normally applied much thinner than spray-applied liquid or <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=powder+coatings&amp;st=31\" target=\"_blank\" rel=\"noopener\">powder coatings<\/a>, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=dip&amp;st=31\" target=\"_blank\" rel=\"noopener\">dip<\/a> or electrocoat paints. Applied primer dry film thicknesses are normally in the range of 4 \u2013 6 microns in thickness, whereas topcoats are normally applied to provide a dry film thickness of 18 \u2013 20 microns.<\/p>\n<p>Special consideration when formulating coil coatings include adjustments in the resin technology, crosslinking, solvent system, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=catalyst&amp;st=31\" target=\"_blank\" rel=\"noopener\">catalyst<\/a>, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/search?k=surface+modifiers&amp;st=31\" target=\"_blank\" rel=\"noopener\">surface modifiers<\/a> and <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/Product\/search?k=Lubricants&amp;sug=1&amp;st=31\" target=\"_blank\" rel=\"noopener\">lubricants<\/a> to accommodate proper cure, flow and leveling, and minimization of surface defects. Once cured, coil coatings can offer excellent handling, physical, chemical and environmental properties. From a paint usage standpoint, <a href=\"https:\/\/www.ulprospector.com\/en\/na\/Coatings\/Product\/search?k=Polyesters&amp;sug=1&amp;st=31\" target=\"_blank\" rel=\"noopener\">polyesters<\/a> make up the bulk of coil coatings. Table II details typical materials utilized in a polyester coil coating.<\/p>\n<figure id=\"attachment_2880\" class=\"thumbnail wp-caption aligncenter\" style=\"width: 512px\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2880\" src=\"https:\/\/ulprospector.ul.com\/media\/2015\/08\/Screen-Shot-2015-08-04-at-2.51.17-PM.png\" alt=\"Table II \u2013 Typical Raw Materials (on Resin Solids) used in a Typical Polyester Coil Topcoat (1.2:1.0 Pigment:Binder, Dupont R960 Titanium Dioxide)\" width=\"512\" height=\"298\" srcset=\"https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-04-at-2.51.17-PM.png 512w, https:\/\/ulprospector.ul.com\/wp-content\/uploads\/2015\/08\/Screen-Shot-2015-08-04-at-2.51.17-PM-300x175.png 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><figcaption class=\"caption wp-caption-text\">Table II \u2013 Typical Raw Materials (on Resin Solids) used in a Typical Polyester Coil Topcoat (1.2:1.0 Pigment:Binder, Dupont R960 Titanium Dioxide)<\/figcaption><\/figure>\n<p>In summary, coil coating technology has grown more rapidly than more conventional application technologies due to a variety of benefits that include cost savings, versatility, environmental, performance and quality issues.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over 800 million tons of coil-coated metal are produced and shipped annually in North America alone. Coil coating (see Diagram I) is a very efficient way to produce a uniform, high quality, coated finish over metal in a continuous automated &hellip; <a href=\"https:\/\/ulprospector.ul.com\/2862\/pc-coil-coating-explained\/\">Continued<\/a><\/p>\n","protected":false},"author":12,"featured_media":2884,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[16],"tags":[],"ppma_author":[1249],"class_list":["post-2862","post","type-post","status-publish","format-standard","has-post-thumbnail","category-paint-coatings","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coil Coating Explained | Prospector<\/title>\n<meta name=\"description\" content=\"Coil coating is a very efficient way to produce a uniform, high quality coated finish over metal. 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