{"id":7327,"date":"2024-08-21T09:54:18","date_gmt":"2024-08-21T09:54:18","guid":{"rendered":"https:\/\/www.fhopepack.com\/videos\/?p=7327"},"modified":"2026-10-29T04:32:35","modified_gmt":"2026-10-29T04:32:35","slug":"what-kind-of-stretch-film-fit-for-coil-packing","status":"publish","type":"post","link":"https:\/\/www.fhopepack.com\/videos\/what-kind-of-stretch-film-fit-for-coil-packing\/","title":{"rendered":"Stretch Film for Coil Packing: Wire Coil and PVC Pipe"},"content":{"rendered":"<blockquote>\n<p><strong>Executive summary<\/strong>\nStretch film for coil packing, for wire coil and PVC pipe coil wrapping alike: for eye-through coil wrapping we run LLDPE stretch film on a 50 mm core, 100\u2013150 mm wide, with a roll OD up to 450 mm on our FPS-300. Our standard film is 25 micron, thicker 32\u201350 micron film also runs, and VCI film is added against rust. A worked example calculates film length and weight per coil.<\/p>\n<\/blockquote>\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/DAGTaDChl2c\" title=\"Vertical wire coil wrapper wrapping a prestressed steel wire coil\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/_xT8qrN5qEE\" title=\"Ring wrapper wrapping a PVC pipe coil in stretch film\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<h2>What the film has to do on a coil<\/h2>\n<p>On an eye-through wrapper, the film passes continuously through the coil eye (inside diameter) and around the outside perimeter with every revolution of the rotating ring. To ensure load integrity, the film must cling firmly to itself, elongate smoothly over the sharp inner and outer radial edges, and maintain set tension while driven rollers rotate the coil.<\/p>\n<p>Our vertical wire coil wrapper stands the prestressed steel wire coil on edge in a floor pit, so the coil rolls in at floor level. Driven carrier rollers turn the coil while the orbital ring lays stretch wrap through the eye. On a wire coil the film must bridge the gaps between wire turns and hold where the coil sits on the rollers.<\/p>\n<p>Our hose and pipe coil wrapper works the other way up: a PVC pipe coil lies flat on support rollers and the ring applies film through the eye. A plastic pipe coil is light and soft, so the film needs enough tension to hold the turns together but not so much that it squeezes the coil out of round.<\/p>\n<h2>Film type: LLDPE, PE, PVC, HDPE or paper<\/h2>\n<p>The FPS-300 wrapper handles PVC, LLDPE, PE, HDPE, and paper. For standard steel wire bundles and industrial coils, linear low-density polyethylene (LLDPE) stretch film is the primary material due to its high puncture resistance, self-clinging properties, and moisture sealing.<\/p>\n<p>Paper is applied where the coil surface must breathe or where direct polymer-to-metal contact is restricted. On larger dual-dispenser systems such as the FPS-500, two rolls run synchronously\u2014allowing a combined single-pass application of anti-corrosion VCI film beneath protective LLDPE stretch film.<\/p>\n<h2>Roll size: it has to fit the ring<\/h2>\n<p>The film roll rides on the turning ring and passes through the coil eye, so the roll size is set by the machine, not by the film supplier. On the FPS-300 the roll must match this table.<\/p>\n<table>\n<thead>\n<tr>\n<th style=\"text-align: left\">Film roll item<\/th>\n<th style=\"text-align: left\">FPS-300 value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: left\">Core ID<\/td>\n<td style=\"text-align: left\">50 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Roll OD<\/td>\n<td style=\"text-align: left\">100\u2013450 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Film width<\/td>\n<td style=\"text-align: left\">100\u2013150 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Materials<\/td>\n<td style=\"text-align: left\">PVC, LLDPE, PE, HDPE, paper<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Overlap rate<\/td>\n<td style=\"text-align: left\">10\u201390%<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: left\">Coil range<\/td>\n<td style=\"text-align: left\">508\u2013610 mm ID, 600\u20131,200 mm OD, 100\u2013300 mm wide, 20\u20131,000 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A wider roll covers the coil in fewer turns, but it has to pass through the eye. For coils near the minimum 508 mm ID, confirm roll outer diameter and carriage clearance before ordering wide film.<\/p>\n<h2>Thickness<\/h2>\n<p>Our standard specification for coil wrapping is 25 \u00b5m (micron) film. Machine tensioning systems are also calibrated to handle heavy-gauge film from 32 to 50 \u00b5m. Thicker films provide high tear resistance on sharp slit edges, burred wire, and during multimodal transit, though they increase packaging weight per coil.<\/p>\n<p>Engineering recommendation: Deploy standard 25 \u00b5m film for baseline operations, increasing gauge to 32\u201350 \u00b5m only when sharp edge punctures or rough handling during transit demand extra puncture strength.<\/p>\n<h2>VCI film against rust<\/h2>\n<p>Volatile Corrosion Inhibitor (VCI) film releases active passivating chemicals within the sealed enclosure to arrest oxidation on unpainted steel surfaces. This barrier is essential for export shipping via ocean container or extended storage in humid environments.<\/p>\n<p>The standard configuration applies a primary VCI layer directly against the steel surface, encapsulated by an outer layer of LLDPE stretch film for mechanical clamping and moisture sealing. Dual-dispenser models like the FPS-500 execute this multi-layer wrap in a single automated cycle.<\/p>\n<h2>Overlap and layers<\/h2>\n<p>Film overlap on the FPS-300 is adjustable from 10% to 90%. At a 50% overlap setting, every point on the coil surface receives two complete layers of film per wrap cycle. Higher overlap ratios (e.g., 60\u201375%) add containment layers and are recommended for export packing.<\/p>\n<p>Overlap is tightest at the coil ID, where the turns crowd together, and loosest at the OD, so the setting is calculated for the coil OD.<\/p>\n<h2>Worked example: film length and weight per coil<\/h2>\n<p>The calculation below uses an illustrative coil geometry: 1,200 mm OD, 508 mm ID and 300 mm width, wrapped with 120 mm LLDPE film at 50% overlap. These are illustrative customer figures; the coil fits the FPS-300 (600\u20131,200 mm OD, 100\u2013300 mm width).<\/p>\n<p><strong>Film path per turn.<\/strong> One complete ring revolution passes through the eye, across the outer perimeter, and over both sidewall faces. The radial wall depth equals:\n(1,200 mm \u2212 508 mm) \u00f7 2 = 346 mm.\nThe cross-sectional wrap perimeter per turn is:\n2 \u00d7 346 mm + 2 \u00d7 300 mm = 1,292 mm (approximately 1.29 m).<\/p>\n<p><strong>Number of turns.<\/strong> At 50% overlap, the advance distance per turn at the OD is:\n120 mm \u00d7 0.5 = 60 mm.\nOuter circumference of the coil:\n\u03c0 \u00d7 1,200 mm = 3,770 mm.\nRequired ring revolutions per coil:\n3,770 mm \u00f7 60 mm = 63 turns.<\/p>\n<p><strong>Film length.<\/strong> Total relaxed film applied to the coil:\n63 turns \u00d7 1.29 m = 81 m.<\/p>\n<p><strong>Film weight.<\/strong> Standard LLDPE polymer has a density of approximately 920 kg\/m\u00b3.\nAt 25 \u00b5m (0.000025 m) thickness, 81 m of 120 mm (0.12 m) wide film equals:\n0.000025 m \u00d7 0.12 m \u00d7 81 m = 0.000243 m\u00b3.\nNet film weight per coil:\n0.000243 m\u00b3 \u00d7 920 kg\/m\u00b3 = 0.22 kg.\nIf 50 \u00b5m film is selected, the total weight doubles to 0.45 kg.<\/p>\n<p><strong>Stretch factor.<\/strong> The actual film length paid out from the roll is less than 81 m due to mechanical elongation under tension:\nActual roll payout length = 81 \u00f7 (1 + s),\nwhere s is your stretch ratio. Your film supplier states the stretch the film is rated for, and we set the tension on the machine to suit it.<\/p>\n<h2>Selection checklist: what to send us<\/h2>\n<p>To verify machine sizing, ring clearance and film compatibility, send us:<\/p>\n<ol>\n<li>Coil dimensions: outer diameter (OD), inner diameter (ID), axial width, and maximum weight (kg).<\/li>\n<li>Coil material and surface condition: bare steel, oiled, painted, or non-ferrous.<\/li>\n<li>Transport profile: domestic flatbed truck, rail, or ocean container freight.<\/li>\n<li>Existing packaging consumables: material type, roll width, core ID, and thickness.<\/li>\n<li>Supplementary barrier requirements: VCI film or paper.<\/li>\n<li>Target throughput requirement: finished coils per hour.<\/li>\n<\/ol>\n<h2>Safety and EN 415-10<\/h2>\n<p>For CE compliance, our machines are designed and manufactured in accordance with EN 415-10 (Safety of packaging machines \u2014 wrapping machines) and risk assessment standard ISO 12100:2010. Primary machine hazards include the high-speed orbital ring carriage, powered drive rollers, and automated film clamping\/cutting units.<\/p>\n<p>Operational safety rules:<\/p>\n<ul>\n<li>Load film rolls only with the ring stopped.<\/li>\n<li>Keep guards and interlocks closed while the ring turns.<\/li>\n<li>Use the emergency stop to clear a film break.<\/li>\n<\/ul>\n<h2>Engineering FAQ<\/h2>\n<p><strong>Q: Can we run our existing film inventory on this machine?<\/strong>\nA: Yes, provided the roll fits the ring: 50 mm core ID, outer diameter up to 450 mm, and film width between 100 and 150 mm on the FPS-300.<\/p>\n<p><strong>Q: Should we select thicker film to eliminate tearing?<\/strong>\nA: Not necessarily. Standard 25 \u00b5m film covers most applications. Increase to 32\u201350 \u00b5m only if sharp coil edges tear or the coil travels hard.<\/p>\n<p><strong>Q: Can the wrapper apply stretch film and VCI film simultaneously?<\/strong>\nA: Yes. Dual-dispenser systems such as the FPS-500 run two independent rolls, applying an inner VCI layer and an outer LLDPE layer in a single cycle.<\/p>\n<p><strong>Q: What machine safety standards govern the equipment build?<\/strong>\nA: We engineer machines to EN 415-10 as the primary European packaging machine standard, with risk assessment under ISO 12100:2010.<\/p>\n<h2>Next step<\/h2>\n<ol>\n<li><strong>Email your coil size, transport route and current film<\/strong> to <strong>info@fhopepack.com<\/strong>.<\/li>\n<li><strong>We reply within 24 hours with a proposal<\/strong>, with the machine, film type, thickness and overlap.<\/li>\n<li><strong>We send a film test plan<\/strong> for your coils.<\/li>\n<\/ol>\n<h2>Related reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.fhopepack.com\/Steel-coil-wrapping-machine\/Steel-coil-wrapping-machine-FPS-300.html\">FPS-300 steel coil wrapping machine<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/Steel-coil-wrapping-machine\/Steel-coil-packing-machine-FPS-500.html\">FPS-500 steel coil packaging machine<\/a><\/li>\n<li><a href=\"https:\/\/www.fhopepack.com\/videos\/testing-with-pe-film-coil-wrapping-machine\/\">Testing with PE film on a coil wrapping machine<\/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\/how-to-automatically-pack-steel-coils-using-paper-and-stretch-film\/\">How to automatically pack steel coils using paper and stretch film<\/a><\/li>\n<\/ul>\n<h2>Sources<\/h2>\n<ul>\n<li>Machine Specifications: FHOPE FPS-300 and FPS-500 product technical documentation; film thickness parameters from manufacturer quotation data.<\/li>\n<li>Video Documentation: <a href=\"https:\/\/www.youtube.com\/watch?v=DAGTaDChl2c\">prestressed steel wire coil wrapping<\/a> and <a href=\"https:\/\/www.youtube.com\/watch?v=_xT8qrN5qEE\">PVC pipe coil film wrapping<\/a> on YouTube.<\/li>\n<li>Material Calculations: Radial depth, overlap geometry, and polymer weight formulations based on standard continuous eye-through coil packaging kinematics.<\/li>\n<li>Applicable Standards: EN 415-10 (Safety of packaging machines \u2014 Part 10: General requirements); ISO 12100:2010 (Safety of machinery \u2014 General principles for design \u2014 Risk assessment and risk reduction).<\/li>\n<\/ul>\n<p><strong>Last reviewed:<\/strong> 2026-10-29<\/p>","protected":false},"excerpt":{"rendered":"<p>Executive summary Stretch film for coil packing, for wire coil and PVC pipe coil wrapping alike: for eye-through coil wrapping we run LLDPE stretch film on a 50 mm core, 100\u2013150 mm wide, with a 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