{"id":7996,"date":"2026-08-06T10:00:00","date_gmt":"2026-08-06T02:00:00","guid":{"rendered":"https:\/\/maxtormetal.com\/?p=7996"},"modified":"2026-08-06T21:55:29","modified_gmt":"2026-08-06T13:55:29","slug":"snake-cuts-film-slitting-systems-checklist","status":"publish","type":"post","link":"https:\/\/maxtormetal.com\/fr\/snake-cuts-film-slitting-systems-checklist\/","title":{"rendered":"Supprimer les coupes en serpentin dans le d\u00e9coupage de film : Checklist syst\u00e8me pour lame, tension, alignement et air"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade.jpg\" alt=\"Stopping Snake Cuts in film slitting with a systems checklist\" class=\"wp-image-5486\" style=\"aspect-ratio:1.7777777777777777;object-fit:cover;width:792px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade.jpg 1000w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/11\/Circular-Cutting-Blade-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div><p>Les coupes en serpentin (\u00e9galement appel\u00e9es d\u00e9viation ou d\u00e9rive de la ligne de coupe) surviennent lorsqu'un bord d\u00e9coup\u00e9 ne maintient pas une trajectoire droite et r\u00e9p\u00e9table : les bandes \u00ab d\u00e9rivent \u00bb, oscillent ou se d\u00e9calent progressivement, de sorte que les spires de la bobine enroul\u00e9e ne sont plus centr\u00e9es. Traitez cela comme un probl\u00e8me de stabilit\u00e9 de l'ensemble du syst\u00e8me de d\u00e9coupe et d'enroulement, et non comme un d\u00e9faut li\u00e9 \u00e0 un seul param\u00e8tre.<\/p><p>This checklist reflects the way most maintenance and process teams debug the issue in the field. It draws on the diagnostic sequence Maxtor Metal&#8217;s field engineering team uses when troubleshooting why a cut that looks fine at setup becomes unstable at speed.<\/p><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Points cl\u00e9s \u00e0 retenir<\/strong>: If snake cuts change with speed, roll build, or lane position, start by isolating&nbsp;<em>where the lateral force is coming from<\/em>&nbsp;(knife forces vs. web mechanics vs. air\/static) before you start \u201cturning knobs.\u201d<\/p><\/blockquote><p>This systems-first diagnostic approach is the framework Maxtor Metal&#8217;s application engineering team applies when supporting customers on film and nonwoven slitting lines where lane drift has resisted single-variable fixes.<\/p><h2 class=\"wp-block-heading\" id=\"715070d5-bf5d-4435-8d57-3b8f5008c921\">Flux de diagnostic rapide<\/h2><h3 class=\"wp-block-heading\" id=\"a1f0c375-19bf-43db-9471-850188090b4d\">When to suspect blade issues<\/h3><ul><li>The problem is\u00a0<strong>lane-specific<\/strong>\u00a0(one or two lanes drift while neighbors hold position).<\/li>\n\n<li>Drift starts\u00a0<strong>right at the slitting point<\/strong>, even at low speed.<\/li>\n\n<li>You recently changed knives, spacers, holders, or moved the knife stack.<\/li>\n\n<li>The drift has a repeating \u201conce per revolution\u201d character (often linked to runout or an out-of-true seat).<\/li><\/ul><p>Quick checks:<\/p><ul><li>Verify knife stack cleanliness (no trapped film, adhesive, burrs on faces).<\/li>\n\n<li>Dial-indicator runout check on arbor\/knife faces at the lanes that drift.<\/li>\n\n<li>Confirm overlap\/engagement and cant\/tram are in the expected range for the cut method.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"ac742b53-5006-4faf-841e-655f3a07878a\">When to suspect tension\/winding<\/h3><ul><li>Drift gets worse as\u00a0<strong>roll diameter builds<\/strong>.<\/li>\n\n<li>The defect \u201cmoves\u201d from lane to lane with\u00a0<strong>core position<\/strong>\u00a0or turret changes.<\/li>\n\n<li>You see\u00a0<strong>telescoping<\/strong>, loose edges, or lane-to-lane hardness variation.<\/li>\n\n<li>Drift improves immediately when you\u00a0<strong>reduce speed<\/strong>\u00a0or change tension setpoints.<\/li><\/ul><p>Quick checks:<\/p><ul><li>Compare unwind\/mid-web\/rewind zone tensions (actual vs setpoint).<\/li>\n\n<li>Verify taper tension behavior across the roll build.<\/li>\n\n<li>Confirm differential shaft slip is working lane-by-lane (no seized elements).<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"bb08c546-02cb-438c-8360-adbe7aaf9aee\">When to suspect alignment\/speed<\/h3><ul><li>Drift worsens after maintenance, bearing replacement, or a bump\/overload event.<\/li>\n\n<li>The web tracks well upstream, then shifts after a particular roll or nip.<\/li>\n\n<li>You hear\/feel vibration, see pattern marks, or have edge guide oscillation.<\/li><\/ul><p>Quick checks:<\/p><ul><li>Roll parallelism and nip balance; look for obvious skew or uneven wear.<\/li>\n\n<li>Speed matching at shear nip (knife speed vs web speed).<\/li>\n\n<li>Bearing health and vibration (temperature, noise, spectrum if available).<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3.jpeg\" alt=\"Infographic: decision-flow chart from symptom to checks\" class=\"wp-image-7997\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-3-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"06964378-4bd8-4b8e-8d5a-287aa5c95245\">Snake cut root-cause matrix<\/h3><p>Use this table as a rapid triage reference before adjusting any settings.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><th>Symptom pattern<\/th><th>Most likely subsystem<\/th><th>First check<\/th><\/tr><tr><td>Lane-specific drift, starts at the knife, present at low speed<\/td><td>Blade \/ holder<\/td><td>TIR at arbor + knife faces on affected lanes; compare to stable lanes<\/td><\/tr><tr><td>Drift worsens as roll builds; improves when speed drops<\/td><td>Tension \/ differential winding<\/td><td>Actual vs setpoint tension in each zone; differential shaft slip torque<\/td><\/tr><tr><td>Drift appeared after maintenance or mechanical event<\/td><td>Alignment \/ bearing<\/td><td>Roll parallelism; bearing temperature and vibration spectrum<\/td><\/tr><tr><td>Drift varies by parent roll lot or lane position (edge vs center)<\/td><td>Material \/ gauge profile<\/td><td>Cross-web thickness variation; lane-to-lane hardness correlation with parent roll position<\/td><\/tr><tr><td>Drift worsens at speed, improves when lay-on pressure increases<\/td><td>Air entrainment \/ static<\/td><td>Speed reduction test; ionizer output and grounding continuity check<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\" id=\"ed704372-0220-4135-b08d-b19b97ac3b92\">R\u00e9glage des lames et tol\u00e9rances<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001.jpg\" alt=\"R\u00e9glage des lames et tol\u00e9rances\" class=\"wp-image-4872\" style=\"aspect-ratio:1.3333333333333333;object-fit:cover;width:777px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u5200\u548c\u4e0b\u52001-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"7ba1772d-d5b3-4b12-bad3-2e67225530be\">Sharpness, runout, overlap, cant<\/h3><p>Snake cuts often start as a small, repeatable lateral bias. In many lines, the fastest way to prove or disprove \u201cknife-driven\u201d wander is to measure runout where it matters.<\/p><ul><li><strong>Acuit\u00e9<\/strong>: A dull edge increases cutting force and can \u201csteer\u201d the web, especially in thin films at higher speeds.<\/li>\n\n<li><strong>Runout (TIR)<\/strong>: Check arbor shoulders, spacer faces, and knife faces\u2014not just one convenient point. Maintain Total Indicated Runout within\u00a0<strong>\u22640.025\u20130.050 mm (0.001\u20130.002 in)<\/strong>\u00a0across the entire assembly. Maxtor Metal&#8217;s incoming inspection records TIR at both the knife face and arbor contact surface per batch, so field measurements can be compared against documented factory data when a drift problem appears after a knife change.<\/li>\n\n<li><strong>Overlap \/ engagement<\/strong>: Set overlap to the minimum stable value for your method and material (typically starting at\u00a0<strong>0.5\u20131.2 mm \/ 0.020\u20130.045 in<\/strong>\u00a0for standard shear film slitting). Excess overlap can mask a mechanical issue temporarily while adding heat and side load.For thin films (PE\/PP\/PET &lt;50 \u03bcm), Maxtor Metal&#8217;s field engineering team uses 0.50\u20130.75 mm as the starting window and adjusts based on edge quality and cutting force trend. For a full treatment of how overlap, cant angle, and spring-loaded preload interact during setup, see\u00a0<a href=\"https:\/\/maxtormetal.com\/fr\/spring-loaded-setup-zero-clearance-shear-slitting\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>Spring-Loaded Setup for Zero-Clearance Shear Slitting: Overlap, Cant Angle &amp; Preload Control<\/strong><\/em><\/a>.<\/li>\n\n<li><strong>Cant \/ tram<\/strong>: Keep cant angles within manufacturer specifications (typically\u00a0<strong>0.25\u00b0\u20130.5\u00b0<\/strong>). If the machine isn\u2019t trammed correctly, you can get a cut that looks acceptable at setup but becomes unstable as forces rise with speed.<\/li><\/ul><p>For shear cutting references, the DIENES Slitting Reference Guide is a useful baseline for how overlap is treated as a controlled variable rather than a \u201cmore is better\u201d setting (see\u00a0<a href=\"https:\/\/www.dienesusa.com\/wp-content\/uploads\/2015\/11\/Dienes-Slitting-Reference-Guide-2nd-Edition.pdf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>DIENES Slitting Reference Guide, 2nd ed. (PDF)<\/strong><\/em><\/a>).<\/p><p>For lines where coating choice is also under review\u2014particularly whether DLC or PTFE coatings affect drift behavior and cleaning intervals\u2014see\u00a0<a href=\"https:\/\/maxtormetal.com\/fr\/dlc-vs-ptfe-coatings-slitting-blades\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>Guide de S\u00e9lection des Rev\u00eatements DLC vs PTFE pour Lames de Refendage : Usure vs Transfert de Mati\u00e8re<\/em><\/strong><\/a>.<\/p><h3 class=\"wp-block-heading\" id=\"f31719ce-1cee-4064-ac58-ea0b8c091f14\">Holder rigidity and side load<\/h3><p>Even with good knives, a flexible holder or a stack that allows side load variation will turn into drift at speed.<\/p><p>Checks that usually pay off:<\/p><ul><li>Confirm holders are seated flat and clamped consistently across the stack.<\/li>\n\n<li>Inspect for fretting, galling, or wear marks that indicate micro-movement under load.<\/li>\n\n<li>Verify spacers are not \u201ctolerance stacking\u201d into a lateral bias (especially on multi-lane builds).<\/li>\n\n<li>Watch for side load increases that correlate with roll build or temperature rise.<\/li><\/ul><p>Supply quality matters to setup stability more than most teams account for. Knife lots with inconsistent hardness or dimensional variation introduce a variable that looks like a setup problem but doesn&#8217;t respond to setup adjustments.<\/p><p>Maxtor Metal documents hardness, dimensional inspection, and heat\/lot traceability records for all circular slitting knife shipments\u2014so when a drift problem appears after a knife change, the investigation can start from verified data on the incoming batch rather than working backward from symptoms.<\/p><p>For OEM\/ODM projects where knives must match legacy holders, arbors, or engineering drawings, Maxtor Metal provides full custom specification support to avoid turning a straightforward knife replacement into a geometry trial-and-error cycle.<\/p><h3 class=\"wp-block-heading\" id=\"b2f088cb-e3ba-4bc1-b58c-69c0668c12e9\">Shear vs razor vs crush choices<\/h3><p>Match the cut method to the material and the defect you\u2019re fighting:<\/p><ul><li><strong>D\u00e9coupe par cisaillement<\/strong>: Best when you need consistent edge quality and can maintain geometry (runout, overlap, side load). Tends to be stable when the mechanical baseline is correct.<\/li>\n\n<li><strong>Razor slitting<\/strong>: Simple and clean on thin films, but sensitive to blade condition, groove positioning, and web stability. Groove position matters: if the groove is too shallow relative to web thickness, the blade deflects laterally under web tension and the cut path wanders with web speed changes; if too deep, the web wraps the groove edges and tracking becomes sensitive to any lateral tension asymmetry. Drift can also appear quickly when the web rides on an air film at speed, or when static increases lateral adhesion to guide surfaces.<\/li>\n\n<li><strong>\u00c9crasement et fente<\/strong>: Can be forgiving in some setups but can also amplify wandering when rubber\/anvil conditions vary or when heat builds.<\/li><\/ul><figure class=\"wp-block-table\"><table><tbody><tr><th>Substrate \/ Film Category<\/th><th>Recommended Method<\/th><th>Key Advantage<\/th><th>Drift Risk Factor<\/th><\/tr><tr><td>Thin Polyolefin (BOPP \/ PE)<\/td><td>Razor in groove \/ Shear<\/td><td>Clean slit edge, minimal dust<\/td><td>Blade deflection, air floating<\/td><\/tr><tr><td>Rigid \/ High Modulus (PET, PVC)<\/td><td>D\u00e9coupe par cisaillement<\/td><td>Precise cut geometry, clean edges<\/td><td>Knife runout, cant misalignment<\/td><\/tr><tr><td>Thick \/ Laminated Films<\/td><td>Shear \/ Heavy Crush<\/td><td>High shear force capacity<\/td><td>Side-load variation, blade wear<\/td><\/tr><\/tbody><\/table><\/figure><p>If you\u2019re seeing snake cuts only on certain SKUs, reassess whether the method matches film thickness, modulus, COF, and speed window.<\/p><h2 class=\"wp-block-heading\" id=\"02d76de9-a798-44eb-9088-695f3bfb8124\">Contr\u00f4le de la tension et de l'enroulement<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001.jpg\" alt=\"Contr\u00f4le de la tension et de l&#039;enroulement\" class=\"wp-image-4873\" style=\"width:492px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0a\u52001-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"b4eb7cc1-e5a3-4cd4-a5fc-aa15ee19881a\">Setpoints and profiles<\/h3><p>Tension isn\u2019t just a number\u2014it\u2019s a profile across zones and over time. A stable slit path depends on a stable web strain state.<\/p><p>Practical rules that hold up:<\/p><ul><li>Keep tension stable across\u00a0<strong>unwind \u2192 process span \u2192 rewind<\/strong>, and verify actual load cell measurements against controller setpoints. Tension shifts exceeding\u00a0<strong>\u00b15%\u20138%<\/strong>\u00a0from target are often enough to induce lateral web slip and initiate slit-line drift. Maxtor Metal&#8217;s field team uses this \u00b15%\u20138% band as the flag threshold when reviewingtension logs during post-drift investigations on customer lines.<\/li>\n\n<li>Use taper tension intentionally; as diameter increases, tension often needs to decrease to avoid telescoping, edge buckle, or crushed cores.<\/li><\/ul><p>For a standards-based starting point on web tension guidance, TAPPI publishes tension guidance documents such as\u00a0<a href=\"https:\/\/webstore.ansi.org\/standards\/tappi\/tappitip0200012021\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>TAPPI TIP 0200-01:2021 (web tension guidelines<\/strong><\/em><\/a><a href=\"https:\/\/webstore.ansi.org\/standards\/tappi\/tappitip0200012021\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>)<\/strong><\/em><\/a>.<\/p><h3 class=\"wp-block-heading\" id=\"40e7b82c-944c-4951-bd6f-9cdbf1553cf3\">Differential shafts and nip<\/h3><p>Differential winding is often the difference between \u201clanes that behave\u201d and \u201clanes that walk.\u201d When lanes build diameter at slightly different rates, the system needs a controlled way to equalize torque so one lane doesn\u2019t go slack and start wandering.<\/p><p>Checks:<\/p><ul><li>Confirm differential elements actually slip under the expected torque range.<\/li>\n\n<li>Validate nip load is balanced across the roll face; uneven nip can create lane-to-lane traction differences.<\/li>\n\n<li>Review taper tension alongside differential settings; if you tighten tension as diameter grows, you can overload one lane and destabilize tracking.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4.jpeg\" alt=\"Schematic: differential shaft slip, nip load balance, and tension taper across lanes\" class=\"wp-image-7998\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4.jpeg 1536w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4-300x200.jpeg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4-1024x683.jpeg 1024w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4-768x512.jpeg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4-18x12.jpeg 18w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2026\/08\/image-4-600x400.jpeg 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"166d0070-a524-44e1-a272-5b76d48f3eb4\">Transitions and traction<\/h3><p>A lot of snake cuts are \u201ctransition defects\u201d:<\/p><ul><li>acceleration to production speed<\/li>\n\n<li>splice passage<\/li>\n\n<li>turret transfer<\/li>\n\n<li>roll hardness change as diameter builds<\/li><\/ul><p>During transitions:<\/p><ul><li>Confirm web path traction is consistent (no sudden slip at a particular roll).<\/li>\n\n<li>Reduce speed briefly as a diagnostic. If drift drops immediately, suspect air\/traction\/static dynamics before you change knives.<\/li>\n\n<li>Treat edge guide hunting as a symptom\u2014often caused by tension oscillation, misalignment, or unstable traction.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"8df9d153-7a05-49ce-8952-d8ecb21a081e\">Alignement et synchronisation de la vitesse<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31.jpg\" alt=\"Alignement et synchronisation de la vitesse\" class=\"wp-image-4869\" style=\"aspect-ratio:1.5;object-fit:cover;width:698px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-12x12.jpg 12w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2024\/06\/\u5206\u5207\u4e0b\u5200-31-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\" id=\"85d13c7d-8ca1-4d3c-8d6e-624a8a079c18\">Rolls, shafts, and nip balance<\/h3><p>If the web is being forced sideways by geometry, no knife setting will \u201chold it straight\u201d consistently.<\/p><ul><li>Check roll parallelism relative to the machine centerline.<\/li>\n\n<li>Inspect roll faces for taper, wear, contamination, or damage.<\/li>\n\n<li>Verify nip pressure distribution; uneven nip can steer the web.<\/li><\/ul><p>A practical reference on the fundamentals of centerline tracking and lateral motion causes is Walker\u2019s compilation in the web handling community (see\u00a0<a href=\"https:\/\/www.webhandling.com\/wp-content\/uploads\/TJWA-WOW8-Web-Lines-2003-2014.pdf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><em><strong>Web Lines: Walker on Web Handling (2003\u20132014 compilation PDF)<\/strong><\/em><\/a>).<\/p><h3 class=\"wp-block-heading\" id=\"bba3701b-0908-4a9f-878a-5ac013dc9bc7\">Speed differential at shear nip<\/h3><p>For shear slitting, speed mismatch can create a lateral force component at the cut.<\/p><p>Checklist:<\/p><ul><li>Verify knife surface speed matches the web where required by your slitting method.<\/li>\n\n<li>Confirm drive coupling\/backlash isn\u2019t creating periodic speed variation.<\/li>\n\n<li>If drift scales with speed but not tension, suspect speed match and vibration.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"d4b5b6c9-1007-4d0e-93f0-c4cdb32c3247\">Bearing health and vibration<\/h3><p>Bearings and vibration problems masquerade as \u201cslitting problems\u201d all the time.<\/p><ul><li>Compare bearing temperatures left vs right.<\/li>\n\n<li>Listen for cyclic noise; check for pattern marks.<\/li>\n\n<li>If you have vibration monitoring, log spectra at the slitting head and rewind.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"404a7e22-a33b-426d-97d2-1e000d7e6327\">Effets du mat\u00e9riau et de l'air<\/h2><h3 class=\"wp-block-heading\" id=\"7fad471f-bd7b-481f-b2a7-353a9e93913a\">Gauge profile and variability<\/h3><p>Cross-web thickness variation and camber create unequal strain across lanes. The web will generally track toward the tighter side.<\/p><p>Checks:<\/p><ul><li>Verify incoming roll profile and hardness consistency.<\/li>\n\n<li>Look for lane-to-lane differences that correlate with parent roll position (edge vs center).<\/li>\n\n<li>If drift only occurs on certain lots, capture lot ID and gauge profile data in your log.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"489e1181-74dc-4629-b1c3-1067c74f048e\">Air entrainment and lay-on<\/h3><p>Air is a real \u201cmechanical element\u201d at high speeds. If the web rides on an air film, traction changes and the cut can wander.<\/p><p>Checks:<\/p><ul><li>Watch for flutter and poor lay-on at rewind.<\/li>\n\n<li>Use lay-on\/nip effectively (within machine limits) to reduce trapped air.<\/li>\n\n<li>As a diagnostic, reduce speed modestly and see whether wander decreases.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"8effe626-dda7-4936-a789-f4056acd77be\">Static and edge defects linkage<\/h3><p>Static charge can pull film toward guides\/rollers, attract dust, and make separation points unstable\u2014especially in thin films at higher speeds.<\/p><p>Checks:<\/p><ul><li>Verify bonding\/grounding continuity at key rolls.<\/li>\n\n<li>Inspect ionizing bars for cleanliness and output.<\/li>\n\n<li>Track whether the defect is worse in low humidity conditions.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"a9b63b0f-2872-4eff-b7aa-bec0d464c06e\">FAQs:<\/h2><h3 class=\"wp-block-heading\" id=\"737a0b02-2ec5-427d-a898-c669a5ce17b5\">Q : Quelle est la cause des coupes en serpentin lors du d\u00e9coupage de film ?<\/h3><p>R : Les coupes en serpentin proviennent g\u00e9n\u00e9ralement d'une instabilit\u00e9 lat\u00e9rale : forces exerc\u00e9es sur la lame (faux-rond, chevauchement, jeu du porte-lame), m\u00e9canique de la bande (d\u00e9s\u00e9quilibre de tension, probl\u00e8mes d'enroulement diff\u00e9rentiel), g\u00e9om\u00e9trie (d\u00e9faut d'alignement, pince de rouleau in\u00e9gale) ou dynamique (inclusion d'air et \u00e9lectricit\u00e9 statique). La m\u00e9thode la plus rapide consiste \u00e0 d\u00e9terminer si la d\u00e9rive d\u00e9bute au niveau de la lame ou si elle appara\u00eet pendant l'enroulement.<\/p><h3 class=\"wp-block-heading\" id=\"37582f33-312e-4353-852e-54b1dc8ba16b\">Q : Comment savoir si la d\u00e9rive de la ligne de coupe est un probl\u00e8me de lame ou de tension ?<\/h3><p>R : Si le probl\u00e8me est localis\u00e9 sur une bande sp\u00e9cifique et d\u00e9bute d\u00e8s la station de d\u00e9coupe, m\u00eame \u00e0 faible vitesse, suspectez les lames, le faux-rond (runout) ou les porte-lames. S'il s'aggrave au fur et \u00e0 mesure que la bobine grossit, s'am\u00e9liore lorsque vous modifiez la tension ou se d\u00e9place avec la position du mandrin, suspectez la tension ou l'enroulement diff\u00e9rentiel.<\/p><h3 class=\"wp-block-heading\" id=\"e51d90fc-5793-4b90-a0c0-0130b4147b4c\">Q : Le faux-rond de la lame (runout) peut-il vraiment provoquer la d\u00e9rive des bandes de coupe ?<\/h3><p>R : Oui. M\u00eame un faible faux-rond peut g\u00e9n\u00e9rer une force lat\u00e9rale r\u00e9p\u00e9titive qui d\u00e9vie la trajectoire de coupe. Mesurez le faux-rond sur l'arbre, les faces des entretoises et les faces de la lame \u00e0 l'aide d'un comparateur \u00e0 cadran, puis comparez les bandes \u00ab conformes \u00bb aux bandes \u00ab d\u00e9fectueuses \u00bb.<\/p><h3 class=\"wp-block-heading\" id=\"20a166ad-0c88-4919-851c-ebc2094cd988\">Q : Quels r\u00e9glages de tension permettent d'arr\u00eater la d\u00e9rive de la ligne de coupe sur une bobineuse-coupeuse ?<\/h3><p>R : Commencez par stabiliser la tension dans chaque zone et v\u00e9rifiez la tension r\u00e9elle par des mesures. Utilisez ensuite un profil de tension d\u00e9gressive (taper) contr\u00f4l\u00e9 pour \u00e9viter que la tension ne s'accumule lorsque le diam\u00e8tre augmente. Les directives publi\u00e9es par la TAPPI peuvent vous aider \u00e0 choisir une plage initiale, que vous ajusterez ensuite en fonction de la duret\u00e9 de la bobine et de la stabilit\u00e9 des bandes.<\/p><h3 class=\"wp-block-heading\" id=\"f316ddf4-6d0d-4be5-a4aa-71546a6f2c70\">Q : Les arbres diff\u00e9rentiels emp\u00eachent-ils la d\u00e9rive des bandes et le t\u00e9lescopage ?<\/h3><p>R : Ils sont utiles lorsque les diam\u00e8tres des bandes augmentent de mani\u00e8re in\u00e9gale, car le glissement contr\u00f4l\u00e9 \u00e9quilibre le couple afin qu'aucune bande ne se d\u00e9tende ni ne d\u00e9vie. Si les \u00e9l\u00e9ments de friction se bloquent ou si le couple est mal r\u00e9gl\u00e9, des diff\u00e9rences de duret\u00e9 entre les bandes et des d\u00e9rives peuvent toujours survenir.<\/p><h3 class=\"wp-block-heading\" id=\"85a4a86b-5d8e-4ac7-8695-f34b2ae86a98\">Q : Pourquoi la d\u00e9rive de la ligne de coupe s'aggrave-t-elle \u00e0 grande vitesse ?<\/h3><p>R : Une vitesse plus \u00e9lev\u00e9e augmente l'inclusion d'air, amplifie les vibrations et accentue l'impact des l\u00e9gers d\u00e9fauts d'alignement. Si la d\u00e9rive diminue rapidement lorsque vous ralentissez, suspectez la dynamique de l'air, la traction ou l'\u00e9lectricit\u00e9 statique avant de modifier la g\u00e9om\u00e9trie des lames.<\/p><h3 class=\"wp-block-heading\" id=\"a632f2cf-e994-483f-8ad5-7df1159e2919\">Q : Comment r\u00e9duire l'inclusion d'air lors de l'enroulement de film ?<\/h3><p>R : Am\u00e9liorez mefficacit\u00e9 du rouleau presseur\/toucheur (lay-on\/nip) dans les limites de la machine, v\u00e9rifiez la g\u00e9om\u00e9trie du chemin de bande \u00e0 l'entr\u00e9e de m'enroulement et ajustez la tension\/d\u00e9gressivit\u00e9 (taper) pour que la bande se conforme \u00e0 la bobine plut\u00f4t que de chevaucher un film d'air. Un test de r\u00e9duction de vitesse est un moyen rapide de confirmer si l'air est \u00e0 l'origine de l'instabilit\u00e9.<\/p><h3 class=\"wp-block-heading\" id=\"faa5d4ef-32c7-4b52-a15d-422b28744684\">Q : O\u00f9 dois-je enregistrer les donn\u00e9es pour \u00e9viter que la coupe en serpentin (snake cuts) ne r\u00e9apparaisse ?<\/h3><p>R : Enregistrez par ID de bobine et par bande : l'assemblage du train de lames (diam\u00e8tre ext\u00e9rieur, \u00e9paisseur, entretoises), les relev\u00e9s de faux-rond (runout), les r\u00e9glages de chevauchement (overlap) et d'angle d'inclinaison (cant angle), les tensions par zone et le profil d\u00e9gressif (taper), le type et les r\u00e9glages de l'arbre d'enroulement, la vitesse, l'\u00e9tat de neutralisation de l'humidit\u00e9\/\u00e9lectricit\u00e9 statique, et si la d\u00e9rive a vari\u00e9 selon la vitesse ou l'augmentation du diam\u00e8tre de la bobine.<\/p><h2 class=\"wp-block-heading\" id=\"56e40890-3e9b-45b7-9c6c-301028fc60e9\">Conclusion<\/h2><div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11.jpg\" alt=\"couteaux de cisaillement circulaires\" class=\"wp-image-3159\" style=\"aspect-ratio:1.3333333333333333;object-fit:cover;width:622px;height:auto\" srcset=\"https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11.jpg 800w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11-300x300.jpg 300w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11-150x150.jpg 150w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11-768x768.jpg 768w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11-600x600.jpg 600w, https:\/\/maxtormetal.com\/wp-content\/uploads\/2023\/10\/Circle-shearing-blade-main11-100x100.jpg 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure><\/div><p>\u00c9liminer les coupes en serpentin (snake cuts) n\u00e9cessite de renoncer aux r\u00e9glages empiriques et au hasard pour adopter une routine de diagnostic syst\u00e9matique fond\u00e9e sur la physique. En v\u00e9rifiant m\u00e9thodiquement la g\u00e9om\u00e9trie de la lame et la rigidit\u00e9 du porte-lame (en maintenant un TIR \u2264 0,050 mm ainsi qu'un chevauchement et un angle d'inclinaison ad\u00e9quats), en stabilisant les profils de tension de bande dans les zones d'enroulement et en \u00e9liminant les d\u00e9fauts d'alignement des rouleaux et l'inclusion d'air \u00e0 haute vitesse, les lignes de transformation de bande peuvent obtenir une stabilit\u00e9 imm\u00e9diate de la ligne de coupe.<\/p><p>Pour transformer cette liste de contr\u00f4le en gains op\u00e9rationnels durables, les usines doivent formaliser ces v\u00e9rifications dans une proc\u00e9dure d'utilisation normalis\u00e9e (SOP). L'embauche d'une fiche de r\u00e9glage standardis\u00e9e \u2014 int\u00e9grant des validations obligatoires pour les relev\u00e9s de faux-rond (runout), de chevauchement (overlap) et de tension \u2014 associ\u00e9e \u00e0 l'\u00e9tablissement d'une cadence de maintenance pr\u00e9ventive (PM) stricte pour les porte-lames, arbres et roulements, r\u00e9duit consid\u00e9rablement la variabilit\u00e9 lors des changements de format.<\/p><p>Pour les usines qui standardisent les outillages sur plusieurs lignes de d\u00e9coupe, Maxtor Metal fournit des couteaux circulaires de cisaillement avec une documentation dimensionnelle et de duret\u00e9 compl\u00e8te par lot, et propose un service OEM\/ODM lorsque les couteaux doivent correspondre aux plans d'arbres et de porte-lames existants.\u00a0<a href=\"https:\/\/maxtormetal.com\/fr\/produit\/lames-circulaires\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em><strong>Maxtor Metal&#8217;s circular knives and blades<\/strong><\/em><\/a>\u00a0for geometry and specification reference.<\/p><p>Ultimately, measuring the success of these stability controls comes down to key performance indicators. High-performing converting operations track five core KPIs to validate their slitting performance:<\/p><ul><li><strong>Scrap &amp; Waste Rate (%)<\/strong>: Direct reduction in trimmed film waste and rejected off-spec rolls.<\/li>\n\n<li><strong>Efficacit\u00e9 globale de l&#039;\u00e9quipement (OEE)<\/strong>: Higher running speeds and sustained cut stability.<\/li>\n\n<li><strong>Unplanned Downtime<\/strong>: Fewer line stops caused by web breaks or mid-run adjustments.<\/li>\n\n<li><strong>Blade Service Life<\/strong>: Extended tool durability resulting from minimized side loading and optimal overlap.<\/li>\n\n<li><strong>Customer Quality Complaints<\/strong>: Lower incidence of edge weaves, telescoping, or slitting defects in finished roll shipments.<\/li><\/ul><hr class=\"wp-block-separator has-alpha-channel-opacity\"\/><h3 class=\"wp-block-heading\" id=\"55c1c061-ca00-44de-9520-2b128971fa5c\">Author \/ Technical Reviewer<\/h3><p><strong>Jerry Chu<\/strong>&nbsp;| Technical Support Specialist (After-sales Service)<br><em>Maxtor Metal<\/em><\/p><p>Jerry brings 10+ years of cross-industry application experience across paper manufacturing, plastic recycling\/crushing, metal slitting, and wood processing. Specializing in resolving real-world slitting challenges\u2014such as cutting burrs, excessive dust, and edge instability\u2014he works directly with field engineering teams to optimize tooling performance and operational reliability.<\/p><ul><li><strong>Certifications<\/strong>: Certified Maintenance &amp; Reliability Professional (CMRP), Project Management Professional (PMP\u00ae)<\/li>\n\n<li><strong>Specialties<\/strong>: On-site slitting troubleshooting, custom blade geometry design, and preventive maintenance SOP development<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>Snake cuts (also called slit-line wander or drift) are what you see when a slit edge won\u2019t hold a straight, repeatable path: lanes \u201cwalk,\u201d oscillate, or gradually shift so the wound roll layers are no longer centered. Treat it like a stability problem across the slit-and-wind system\u2014not a single-parameter defect. This checklist reflects the way [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5486,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,1209],"tags":[1289],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Snake Cuts in Film Slitting? 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