{"id":4146,"date":"2022-04-18T09:57:53","date_gmt":"2022-04-18T09:57:53","guid":{"rendered":"https:\/\/www.fhopepack.com\/videos\/?p=4146"},"modified":"2026-10-28T14:28:44","modified_gmt":"2026-10-28T14:28:44","slug":"coil-wrapping-machine","status":"publish","type":"post","link":"https:\/\/www.fhopepack.com\/videos\/coil-wrapping-machine\/","title":{"rendered":"How a Coil Wrapping Machine Works for Steel Coil Packing"},"content":{"rendered":"<blockquote>\n<p><strong>Executive summary<\/strong><\/p>\n<p>How a coil wrapping machine works for steel packing comes down to two motions. A ring carries the packaging material through the coil eye and round the cross-section, while carrier rollers turn the coil slowly on its own axis. The speed ratio between the two movements determines the wrap overlap. On our FPW-300, steel coils of 600\u20131,200 mm OD, 508\u2013610 mm ID, and up to 1,000 kg roll in, are wrapped in paper or film, and roll out.<\/p>\n<\/blockquote>\n<iframe loading=\"lazy\" width=\"940\" height=\"535\" src=\"https:\/\/www.youtube.com\/embed\/fZlSXDCy_lc\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<h2 id=\"table-of-contents\">Table of Contents<\/h2>\n<ul>\n<li><a href=\"#motions\">The two motions of a coil wrapping machine<\/a><\/li>\n<li><a href=\"#parts\">Main parts of our ring wrapper<\/a><\/li>\n<li><a href=\"#cycle\">How one steel coil is wrapped<\/a><\/li>\n<li><a href=\"#ratio\">The speed ratio that sets overlap<\/a><\/li>\n<li><a href=\"#example\">Worked example: setting the rollers for 30% overlap<\/a><\/li>\n<li><a href=\"#specs\">FPW-300 data for steel coils<\/a><\/li>\n<li><a href=\"#selection-checklist\">Selection checklist<\/a><\/li>\n<li><a href=\"#safety\">Safety: EN 415-10 and ISO 12100<\/a><\/li>\n<li><a href=\"#engineering-faq\">Engineering FAQ<\/a><\/li>\n<li><a href=\"#next-step\">Next step<\/a><\/li>\n<li><a href=\"#related-reading\">Related reading<\/a><\/li>\n<li><a href=\"#sources\">Sources<\/a><\/li>\n<\/ul>\n<h2 id=\"motions\">The two motions of a coil wrapping machine<\/h2>\n<p>A steel coil has a hole through the middle, so the wrap has to go through it. The machine does this by coordinating two synchronized motions:<\/p>\n<ol>\n<li><strong>Orbital rotation through the coil eye.<\/strong> A ring passes vertically through the inner diameter, loops over the outer crown and returns beneath the base. As the ring turns, the dispenser roll mounted on it lays a continuous band of stretch film or paper across the coil cross-section.<\/li>\n<li><strong>Coil rotation on carrier rollers.<\/strong> Concurrently, motorized carrier rollers support the coil from below and rotate it slowly about its own horizontal axis.<\/li>\n<\/ol>\n<p>Each successive band lands a little further round. After one full 360\u00b0 turn of the coil, the whole outer surface and side faces are uniformly covered against moisture, dust and handling damage.<\/p>\n<h2 id=\"parts\">Main parts of our ring wrapper<\/h2>\n<ul>\n<li><strong>Wrapping ring assembly.<\/strong> A vertical ring with an opening gate segment: it unlatches to admit the coil into the ring plane, locks securely before rotation begins, and carries the film or paper dispenser roll with an adjustable tension brake. The gate opening mechanism is confirmed per machine specification.<\/li>\n<li><strong>Coated carrier rollers.<\/strong> Heavy-duty drive rollers in the machine chassis that support the full coil weight. The roller surfaces carry an abrasion-resistant protective coating, so the coil never sits on bare steel \u2014 no scratching, indentations or edge scuffing.<\/li>\n<li><strong>Side guide arms.<\/strong> Guide arms that steady the coil on the rollers and keep it centred during rotation.<\/li>\n<li><strong>Safety perimeter guard.<\/strong> A mesh guard enclosure surrounding the rotational sweep of the ring, closing off the pinch and shear zones during automatic operation.<\/li>\n<li><strong>Operator control cabinet.<\/strong> Beside the machine, outside the guard: pushbuttons, indicator lights, the emergency stop and the one-key automatic cycle start.<\/li>\n<\/ul>\n<h2 id=\"cycle\">How one steel coil is wrapped<\/h2>\n<ol>\n<li><strong>Roll in.<\/strong> The operator rolls the steel coil onto the carrier rollers, eye in line with the ring.<\/li>\n<li><strong>Tie on.<\/strong> With the machine stationary, the material end is fixed to the coil.<\/li>\n<li><strong>Start.<\/strong> The operator returns to the cabinet and starts the automatic cycle with the one-key start.<\/li>\n<li><strong>Wrap.<\/strong> The ring wraps while the carrier rollers turn the coil through exactly one full revolution (or multiple turns if multi-layer wrapping is specified).<\/li>\n<li><strong>Cut and roll out.<\/strong> The machine stops automatically, the material is cut and secured, and the coil is tipped off the rollers and rolled away.<\/li>\n<\/ol>\n<p>Rolling in and out suits lighter coils (typically under 200\u2013300 kg). Heavier coils up to 1,000 kg are loaded and unloaded by overhead crane with a C-hook or coil grab, or by a powered infeed conveyor.<\/p>\n<h2 id=\"ratio\">The speed ratio that sets overlap<\/h2>\n<p>Overlap is not set on the ring. It is governed by the kinematic speed ratio between the carrier rollers and the ring. Let:<\/p>\n<ul>\n<li><strong>n<\/strong> = ring speed in wraps per minute<\/li>\n<li><strong>N<\/strong> = wraps required to cover the coil once<\/li>\n<li><strong>a<\/strong> = advance per wrap, measured at the coil OD<\/li>\n<li><strong>v<\/strong> = carrier roller surface speed at the coil OD<\/li>\n<\/ul>\n<p>The governing relations are:<\/p>\n<ul>\n<li>The coil must complete one full rotation on the rollers while the ring completes exactly N wraps.<\/li>\n<li>The carrier roller surface speed at the coil OD is <strong>v = a \u00d7 n<\/strong>.<\/li>\n<li>The wrapping time is <strong>t = N \u00f7 n<\/strong>.<\/li>\n<\/ul>\n<p>To increase overlap, the rollers turn more slowly relative to the ring (a smaller advance a); to save material, the roller speed is increased. Independent variable frequency drives let both speeds, the material tension and the overlap be adjusted.<\/p>\n<h2 id=\"example\">Worked example: setting the rollers for 30% overlap<\/h2>\n<p>Illustrative steel coil: ID 508 mm, OD 1,000 mm, width 250 mm, 100 mm paper, 30% overlap wanted at the OD.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left\">Step<\/th>\n<th style=\"text-align: left\">Calculation<\/th>\n<th style=\"text-align: left\">Result<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left\">Advance per wrap at OD<\/td>\n<td style=\"text-align: left\">a = 100 \u00d7 (1 \u2212 0.3)<\/td>\n<td style=\"text-align: left\">70 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Wraps per coil<\/td>\n<td style=\"text-align: left\">N = \u03c0 \u00d7 1,000 \u00f7 70<\/td>\n<td style=\"text-align: left\">\u2248 45<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Advance at the ID<\/td>\n<td style=\"text-align: left\">\u03c0 \u00d7 508 \u00f7 45<\/td>\n<td style=\"text-align: left\">\u2248 35 mm, so \u2248 65% overlap<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Roller surface speed<\/td>\n<td style=\"text-align: left\">v = 0.070 m \u00d7 n<\/td>\n<td style=\"text-align: left\">0.07 \u00d7 n (m\/min, n in wraps\/min)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Paper per coil<\/td>\n<td style=\"text-align: left\">45 \u00d7 2 \u00d7 (246 + 250) mm<\/td>\n<td style=\"text-align: left\">\u2248 44.6 m<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Wrapping time<\/td>\n<td style=\"text-align: left\">t = 45 \u00f7 n<\/td>\n<td style=\"text-align: left\">(45 \u00f7 n) minutes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Result.<\/strong> For 30% at the outside, the rollers must move the coil surface 70 mm for every ring wrap. Because the ID is roughly half the OD, the advance shrinks to about 35 mm inside the eye, a tighter \u224865% overlap at the bore \u2014 inherent to eye-through wrapping, not a setting to correct. Whatever ring speed is chosen, the roller speed follows it in that ratio, and the coil needs about 45 wraps and 44.6 m of paper. Doubling the ring speed halves the time only if the rollers double too.<\/p>\n<h2 id=\"specs\">FPW-300 data for steel coils<\/h2>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left\">Item<\/th>\n<th style=\"text-align: left\">Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left\">Coil ID<\/td>\n<td style=\"text-align: left\">508\u2013610 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Coil OD<\/td>\n<td style=\"text-align: left\">600\u20131,200 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Coil width<\/td>\n<td style=\"text-align: left\">100\u2013300 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Coil weight<\/td>\n<td style=\"text-align: left\">20\u20131,000 kg<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Wrap materials<\/td>\n<td style=\"text-align: left\">PVC, LLDPE, PE, paper, HDPE<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Material roll core<\/td>\n<td style=\"text-align: left\">50 mm ID<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Material roll OD<\/td>\n<td style=\"text-align: left\">100\u2013450 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Material roll width<\/td>\n<td style=\"text-align: left\">100\u2013150 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Overlap<\/td>\n<td style=\"text-align: left\">10%\u201390%, adjustable<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Power<\/td>\n<td style=\"text-align: left\">1.5 kW, 380 V, 50 Hz, 3-phase<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Air supply<\/td>\n<td style=\"text-align: left\">4\u20136 bar (0.4\u20130.6 MPa)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Chassis height<\/td>\n<td style=\"text-align: left\">Adjustable, to centre the ring on the coil eye<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Rollers<\/td>\n<td style=\"text-align: left\">Protective coating<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Compliance<\/td>\n<td style=\"text-align: left\">CE certified; ISO 9001 quality system<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Warranty<\/td>\n<td style=\"text-align: left\">2-year manufacturer warranty<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Nominal throughput<\/td>\n<td style=\"text-align: left\">Up to 60 coils per hour [manufacturer rating]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The nominal throughput is a manufacturer rating under favourable coil sizes and feeding; the hourly rate for your line is confirmed at quote, as the machine can be built to your coil specification.<\/p>\n<h2 id=\"selection-checklist\">Selection checklist<\/h2>\n<ol>\n<li>Coil ID, OD, width and weight.<\/li>\n<li>Loading: rolling, crane or conveyor.<\/li>\n<li>Material: paper, film or both.<\/li>\n<li>Overlap wanted at the OD.<\/li>\n<li>Coils per shift.<\/li>\n<li>Voltage.<\/li>\n<\/ol>\n<h2 id=\"safety\">Safety: EN 415-10 and ISO 12100<\/h2>\n<p>The wrapper is built to EN 415-10 and its risk assessment follows ISO 12100:2010. The ring passing through the eye and the turning rollers are the hazards: the ring presents pinch and shear points at the eye, and the driven rollers create nip points beneath the coil. The mesh guard closes the ring area, and the operator starts the cycle only from the cabinet, outside the guard. Tie-on and roll-off are done with the machine stopped, and the E-stop and error light are on the cabinet.<\/p>\n<h2 id=\"engineering-faq\">Engineering FAQ<\/h2>\n<p><strong>Q: Why does the coil need to turn?<\/strong>\nA: The ring lays one band at a time across the section; the coil turning brings fresh surface under the ring until it is covered.<\/p>\n<p><strong>Q: What sets the overlap?<\/strong>\nA: The ratio of roller speed to ring speed. The ring speed sets the time, and the roller speed follows it.<\/p>\n<p><strong>Q: Can it wrap paper and film?<\/strong>\nA: Yes. The dispenser accepts PVC, LLDPE, PE, HDPE and paper on 50 mm cores, so the line can switch between moisture sealing and edge protection.<\/p>\n<p><strong>Q: Which standard applies?<\/strong>\nA: We work to EN 415-10 for this wrapper and document the ISO 12100 risk assessment in the CE file.<\/p>\n<h2 id=\"next-step\">Next step<\/h2>\n<ol>\n<li><strong>Send coil ID, OD, width and weight<\/strong> to info@fhopepack.com.<\/li>\n<li><strong>We set<\/strong> the wrap count, material and loading method.<\/li>\n<li><strong>We reply within 24 hours<\/strong> with a layout and quotation.<\/li>\n<\/ol>\n<h2 id=\"related-reading\">Related reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.fhopepack.com\/Steel-coil-wrapping-machine\/Steel-coil-wrapping-machine-FPS-300.html\">FPW-300 steel coil wrapping machine (product)<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/steel-coil-paper-and-film-wrapping-machine\/\">Steel coil paper and film wrapping machine<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/steel-coil-copper-coil-packaging-machine-for-eye-through-film-wrapping\/\">Steel coil and copper coil packaging machine for eye-through film wrapping<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/the-way-to-load-and-unload-coil-by-the-device-of-coil-wrapping-machine\/\">How to load and unload a coil on a coil wrapping machine<\/a><\/li>\n<\/ul>\n<h2 id=\"sources\">Sources<\/h2>\n<ul>\n<li>FHOPE FPW-300 steel coil wrapping machine product page<\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/Wire-coil-wrapping-machine\/Wire-coil-wrapping-machine-FPW-300.html\">Steel wire ring wrapper (FPW-300 product page)<\/a><\/li>\n<li>Worked example: formula and illustrative figures<\/li>\n<li>Standards: EN 415-10; ISO 12100:2010<\/li>\n<\/ul>\n<p><strong>Last reviewed:<\/strong> 2026-10-18<\/p>","protected":false},"excerpt":{"rendered":"<p>Executive summary How a coil wrapping machine works for steel packing comes down to two motions. A ring carries the packaging material through the coil eye and round the cross-section, while carrier rollers turn the [&hellip;]<\/p>","protected":false},"author":5,"featured_media":4147,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"How a Coil Wrapping Machine Works for Steel | FHOPE","_seopress_titles_desc":"How our coil wrapping machine works for steel packing: ring through the eye, rollers turning the coil, the speed ratio that sets overlap, and EN 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