{"id":859,"date":"2025-09-12T08:32:34","date_gmt":"2025-09-12T08:32:34","guid":{"rendered":"https:\/\/www.durantco.com\/blog\/?p=859"},"modified":"2025-09-12T08:32:34","modified_gmt":"2025-09-12T08:32:34","slug":"contact-vs-no-contact-loop-controls-a-practical-selection-guide-for-coil-processing-lines","status":"publish","type":"post","link":"https:\/\/www.durantco.com\/blog\/contact-vs-no-contact-loop-controls-a-practical-selection-guide-for-coil-processing-lines\/","title":{"rendered":"Contact vs. No-Contact Loop Controls: A Practical Selection Guide for Coil Processing Lines"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Every coil line depends on steady movement. If the strip runs too fast or too slow, the line can jam or the material can get damaged. That is why loop control is so important. It keeps the strip flowing smoothly between machines, reducing stress on the coil and preventing costly downtime.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When you look at options for managing loops, two main choices stand out: contact loop controls and no-contact <\/span><a href=\"https:\/\/www.durantco.com\/mascon-loop-controls.php\"><span style=\"font-weight: 400;\">loop controls<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Each one solves the same problem in a different way, and both have unique strengths. Understanding how they work makes it easier to choose the right setup for your line.<\/span><\/p>\n<h2><b>What a \u201cLoop\u201d Is in a Coil Line<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A loop is the extra length of strip that hangs down between the coil uncoiler and the next machine, such as a straightener or feeder. It acts like a buffer. If the press pulls more quickly, the loop gets smaller. If the press slows down, the loop grows larger. A control system watches this loop and tells the uncoiler when to speed up or slow down.<\/span><\/p>\n<p><b>Why loops matter in coil processing lines:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">They keep tension steady, so the strip does not tear.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">They let each machine in the line run at its best speed.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">They reduce shock on the coil and help prevent jams.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In many systems, a single loop controller does the job. It measures the loop position and sends a signal to the uncoiler drive. Some setups even use a closed loop servo motor for very precise speed changes. This level of control helps when handling sensitive material like thin aluminum or shiny stainless steel.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Different coil lines need different solutions. A <\/span><a href=\"https:\/\/www.durantco.com\/blog\/what-is-a-single-spindle-adjustable-core-decoiler-and-how-does-it-work\/\"><b>single-spindle adjustable-core decoiler<\/b><\/a><span style=\"font-weight: 400;\"> may require basic loop sensing, while a heavy-duty multi-press line might need advanced feedback. Some companies offer specialized products\u2014Loop Contact Solutions Inc, for example, provides tools designed for coil handling. A Loop Contact Solutions review often highlights their simple but durable gear.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">At its core, the loop is the heart of smooth coil handling. Without it, each machine would fight the others. With it, the line works in harmony.<\/span><\/p>\n<h2><b>Contact Loop Controls: The Old Standby<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A contact loop, often called a dancer arm, uses a roller that rests lightly on the coil strip. As the loop grows or shrinks, the arm moves up or down. That motion tells the drive to adjust coil speed.<\/span><\/p>\n<p><b>Key features of contact loop controls:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mechanical feedback: The roller arm connects to a sensor, usually a potentiometer or encoder.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Direct action: The coil line responds as the arm changes position.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Storage effect: The dancer arm provides a small buffer of material, smoothing out sudden speed changes.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<p><b>Advantages:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reliable and proven in many industries.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Works on nearly all materials, including oily or perforated strip.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Simple to install and easy to maintain.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<p><b>Limitations:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The roller touches the strip, which can risk marking delicate finishes.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bearings and rollers need routine inspection.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Space is required for the arm\u2019s movement.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Despite these limits, contact loop controls remain popular. They provide a strong, low-cost solution when durability and storage are more important than surface perfection. Many shops value their simplicity, especially when downtime is expensive.<\/span><\/p>\n<h2><b>No-Contact Loop Controls: High-Tech Eyes<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">No-contact loop controls use sensors to \u201csee\u201d the loop instead of touching it. These sensors can be ultrasonic or laser-based. They measure the distance to the strip and tell the drive how much to adjust.<\/span><\/p>\n<p><b>How they work:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An ultrasonic sensor sends sound waves and measures the return time.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A laser sensor shines a beam and reads the reflection.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The signal is turned into an output for the coil drive, similar to contact systems.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<p><b>Benefits:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">No risk of marking the strip. Perfect for polished or cosmetic surfaces.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Less wear and tear since nothing touches the material.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compact installation with no moving arms or rollers.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<p><b>Challenges:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ultrasonic units may be affected by noise or airflow.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Laser units need clear optics and proper mounting.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sensors require occasional cleaning and calibration.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Still, no-contact loop controls are becoming the go-to choice for high-quality materials. They are especially useful in lines where precision and surface protection are top priorities. As technology improves, their reliability continues to rise, making them a practical option for many coil processing lines.<\/span><\/p>\n<h2><b>Which Is the Right Choice for Your Coil Line?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Choosing between contact loop controls and no-contact loop controls comes down to how your coil line runs, the type of material you handle, and the level of accuracy you need. Both systems keep strip flow steady, but they do it in different ways.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Below, we\u2019ll take things step by step so you can see which option may fit your plant the best.<\/span><\/p>\n<h3><b>1. Looking at the Basics of Performance<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">When you compare these two options, the first thing to think about is performance. Both systems measure the size of the loop and signal the uncoiler to change speed.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Contact loop controls<\/b><span style=\"font-weight: 400;\"> use a roller arm. As the loop grows or shrinks, the arm moves. That motion connects to a sensor, and the drive speeds up or slows down.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>No-contact loop controls<\/b><span style=\"font-weight: 400;\"> use sensors like ultrasonic or laser. They \u201csee\u201d the loop and measure its distance without touching the strip.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Both do the job, but the level of response is slightly different. A dancer arm gives a small buffer of strip. That makes the line steadier when there are sudden speed changes. A sensor-based system reacts quickly but has no extra storage. If your line has lots of sudden pull changes, contact control may handle that better.<\/span><\/p>\n<h3><b>2. Considering Your Material<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The type of material is another big factor.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Strong and common steels<\/b><span style=\"font-weight: 400;\">: Contact systems work fine. They are rugged and don\u2019t usually mark the surface.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Polished, coated, or cosmetic surfaces<\/b><span style=\"font-weight: 400;\">: No-contact sensors are safer. Because nothing touches the strip, you avoid scratches and dents.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Oily or perforated material<\/b><span style=\"font-weight: 400;\">: Contact rollers can slip, but they still work. Ultrasonic sensors may sometimes struggle if the surface gives odd echoes. In those cases, laser sensors tend to be more reliable.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If surface finish is important to your customers, no-contact may be the safer choice.<\/span><\/p>\n<h3><b>3. Installation and Maintenance<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Setup and upkeep also play a big role in the decision.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Contact loop systems<\/b><span style=\"font-weight: 400;\"> need room for the arm to move. They also have bearings and rollers that require checks and lubrication.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>No-contact systems<\/b><span style=\"font-weight: 400;\"> take up less space and have no moving arms. Maintenance usually means keeping the sensor lens or face clean.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Neither system is overly complex, but the mechanical parts of a contact system do add long-term upkeep.<\/span><\/p>\n<h3><b>4. Matching Control to Your Equipment<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Your choice may depend on the drives and controllers you already use.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A single loop controller is common in basic coil lines. It connects to the loop sensor and adjusts the uncoiler drive.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">More advanced lines may tie into a closed loop servo motor for precise, high-speed changes. This setup can be very accurate, but it costs more and requires a skilled setup.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If your line already uses a servo drive, no-contact sensors may give you the best results. If your line is older and uses simple motors, a dancer arm may be easier to integrate.<\/span><\/p>\n<h3><b>5. Thinking About Cost<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Price is always part of the decision. Contact systems are usually less expensive up front. No-contact systems cost more, but they may save money if they prevent surface damage. A scratched or dented strip can mean scrap or returns, which adds up quickly.<\/span><\/p>\n<h3><b>6. Real-World Examples and Feedback<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Many coil shops share reviews of their experiences. For instance, companies like Loop Contact Solutions Inc supply gear for coil handling. A Loop Contact Solutions review often notes that their products are simple, tough, and designed to last.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On the other hand, shops that handle premium metals often talk about the value of laser sensors. They cost more at first but pay off by protecting material.<\/span><\/p>\n<h3><b>7. Making the Call<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">When you line up all the points, here\u2019s a simple way to think about it:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Choose contact loop controls if:<\/b><b><br \/>\n<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">You need rugged, low-cost solutions.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Your line handles standard material with no special finish.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">You want the benefit of loop storage for smoother operation.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Choose no-contact loop controls if:<\/b><b><br \/>\n<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">You work with sensitive, polished, or coated material.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">You need compact installation without moving parts.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">You want high accuracy in a modern, sensor-driven line.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Both systems can be paired with advanced drives and a single loop controller, so the choice often comes down to material and finish quality.<\/span><\/p>\n<h2><b>Conclusion<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Contact loop controls and no-contact loop controls both keep coil lines running smoothly. The right choice depends on your material, speed, and surface needs.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">At the end of the day, both contact and no-contact loop systems are proven in coil processing.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Contact systems are like the tough workhorses\u2014reliable, low-cost, and steady. No-contact systems are the precision specialists\u2014clean, safe, and protective.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">By weighing your materials, budget, and performance needs, you can make a clear, confident choice for your coil line.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For expert equipment and support, reach out to <\/span><a href=\"https:\/\/www.durantco.com\/\"><b>Durant Tool Company<\/b><\/a><span style=\"font-weight: 400;\"> today and keep your coil processing line moving with confidence.<\/span><\/p>\n<h2><b>Frequently Asked Questions<\/b><\/h2>\n<h3><b>How do loop controls help prevent coil jams?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">They adjust coil feed speed so the loop stays steady, reducing tension spikes that can cause jams.<\/span><\/p>\n<h3><b>What makes a contact loop control reliable?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">It uses a simple roller and arm design that works with many materials and needs little upkeep.<\/span><\/p>\n<h3><b>Can no-contact loop controls handle oily strip?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Yes, laser sensors often perform well on shiny or oily surfaces without marking them.<\/span><\/p>\n<h3><b>Do I need a single loop controller for every machine?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">No, one controller can manage the loop between two machines, keeping flow balanced.<\/span><\/p>\n<h3><b>What kind of maintenance do loop sensors need?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Mostly cleaning and checking alignment. No-contact sensors need lens care, while contact rollers need bearing checks.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every coil line depends on steady movement. If the strip runs too fast or too slow, the line can jam or the material can get damaged. That is why loop control is so important. It keeps the strip flowing smoothly between machines, reducing stress on the coil and preventing costly downtime.\u00a0 When you look at [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":860,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/posts\/859","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/comments?post=859"}],"version-history":[{"count":1,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/posts\/859\/revisions"}],"predecessor-version":[{"id":861,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/posts\/859\/revisions\/861"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/media\/860"}],"wp:attachment":[{"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/media?parent=859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/categories?post=859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.durantco.com\/blog\/wp-json\/wp\/v2\/tags?post=859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}