{"id":14361,"date":"2024-11-19T09:36:36","date_gmt":"2024-11-19T08:36:36","guid":{"rendered":"https:\/\/www.acrn.fr\/?p=14361"},"modified":"2026-07-29T09:20:29","modified_gmt":"2026-07-29T07:20:29","slug":"repeatork-motorised-torque-tester-quality-controls","status":"publish","type":"post","link":"https:\/\/www.acrn.fr\/en\/repeatork-motorised-torque-tester-quality-controls\/","title":{"rendered":"Repeatork Motorized torque tester for quality control"},"content":{"rendered":"\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ol><li class=\"\"><a href=\"#tightening-torque-a-quality-parameter-often-left-unchecked\">Tightening torque, a quality parameter often left unchecked<\/a><\/li><li class=\"\"><a href=\"#what-is-a-motorized-torque-tester-for-quality-control\">What is a motorized torque tester for quality control?<\/a><\/li><li class=\"\"><a href=\"#why-does-manual-testing-reach-its-limits-in-intensive-production\">Why does manual testing reach its limits in intensive production?<\/a><\/li><li class=\"\"><a href=\"#how-many-motorized-tests-can-be-performed-per-hour\">How many motorized tests can be performed per hour?<\/a><\/li><li class=\"\"><a href=\"#repeatork-specifications-and-test-modes-for-your-quality-control\">RepeaTork: specifications and test modes for your quality control<\/a><\/li><li class=\"\"><a href=\"#how-to-choose-between-the-repeatork-the-vortex-i-and-the-vortex-dv\">How to choose between the RepeaTork, the Vortex-I, and the Vortex-DV?<\/a><\/li><li class=\"\"><a href=\"#which-standards-govern-torque-testing-on-caps\">Which standards govern torque testing on caps?<\/a><\/li><li class=\"\"><a href=\"#how-to-integrate-the-repeatork-into-your-quality-system\">How to integrate the RepeaTork into your quality system?<\/a><\/li><li class=\"\"><a href=\"#acrn-french-manufacturer-of-the-repeatork\">ACRN, French manufacturer of the RepeaTork<\/a><\/li><\/ol><\/nav><\/div>\n\n\n\n<h2 id=\"tightening-torque-a-quality-parameter-often-left-unchecked\" class=\"wp-block-heading\">Tightening torque, a quality parameter often left unchecked<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The RepeaTork motorized torque tester brings precise, systematic quality control to threaded closures by measuring one key parameter: tightening torque. This parameter determines whether a container stays leak-tight during transport, whether the end consumer can open it without excessive effort, and whether the product complies with GMP, IFS, or BRC requirements. Torque that&#8217;s too low causes leaks and contamination risks. Torque that&#8217;s too high damages the thread or makes the closure impossible for the end user to open.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On many packaging lines, this parameter is still measured manually: an operator picks up the bottle, applies force with a digital torque meter, and records the result on paper or in a spreadsheet. This method works at low throughput. It quickly reaches its limits as soon as production exceeds a few dozen units per hour, or when a client requires individual, per-unit traceability.<\/p>\n\n\n\n<h2 id=\"what-is-a-motorized-torque-tester-for-quality-control\" class=\"wp-block-heading\">What is a motorized torque tester for quality control?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The RepeaTork motorized torque tester is a measuring instrument that applies a constant, adjustable-speed rotation to a container&#8217;s closure, then records the tightening or loosening torque with a resolution on the order of a thousandth of a N\u00b7m. Unlike manual testing, the application speed is fixed by the test program: every measurement is taken under identical conditions, regardless of which operator is on shift.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This consistency is what makes motorized testing relevant for <a href=\"https:\/\/www.acrn.fr\/en\/torque-measurement\/\">GR&amp;R<\/a> (Gage Repeatability and Reproducibility) studies and SPC control charts. On a manual torque meter, the &#8220;reproducibility&#8221; component of a GR&amp;R can account for 15 to 30% of total measured variability. On a properly adjusted motorized torque tester, this component tends toward zero, because the instrument always applies the same rotational kinematics.<\/p>\n\n\n\n<h2 id=\"why-does-manual-testing-reach-its-limits-in-intensive-production\" class=\"wp-block-heading\">Why does manual testing reach its limits in intensive production?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Manual testing reaches its limits as soon as the production rate exceeds 60 to 80 caps per hour, because handling time per unit (picking up, centering, reading, recording the result) rarely drops below 30 to 45 seconds with a handheld torque meter. At this rate, a full-time operator can only check a sample representing 5 to 10% of hourly production.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This sampling rate can be sufficient during capper adjustment validation. It&#8217;s no longer enough when a customer specification requires 100% control of closures, when the specification imposes a standardized method like ASTM D3198, or when a product recall requires retrieving the individual measurement result for every unit shipped.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The other limitation of manual testing is documentation. Results recorded by hand don&#8217;t feed into a real-time SPC flow and don&#8217;t meet the electronic traceability requirements of CFR 21 Part 11 or pharmaceutical GMP.<\/p>\n\n\n\n<h2 id=\"how-many-motorized-tests-can-be-performed-per-hour\" class=\"wp-block-heading\">How many motorized tests can be performed per hour?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With a RepeaTork set to 30 rpm on a standard PET cap with a nominal torque of 1.0 to 1.5 N\u00b7m, the effective cycle time per closure is about 5 seconds: 2 seconds for automatic descent and centering, 2 seconds of rotation up to the peak torque value, 1 second for retraction and exporting the result via RS232 or USB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At this rate, the RepeaTork performs 720 measurements per hour. On a line producing 300 caps per hour, that&#8217;s 100% coverage, with a recorded result for every unit produced.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For comparison, a manual control station with 10% sampling on the same line checks 30 caps per hour. If the capper gradually drifts during production and the defect only appears on 3% of units, sample-based testing has a high probability of missing the anomaly between two sampling points. 100% motorized testing detects it within a few cycles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This calculation varies depending on the torque range, the cap geometry, and the selected test mode. Very high-speed lines (more than 500 units per hour) require inline integration or a dedicated station right at the capper&#8217;s output. In these configurations, choosing the <a href=\"https:\/\/www.acrn.fr\/en\/tightening-torque-for-caps-how-to-measure-and-control-it-during-production\/\">cap tightening torque<\/a> is part of a broader test architecture to define with your methods team.<\/p>\n\n\n\n<h2 id=\"repeatork-specifications-and-test-modes-for-your-quality-control\" class=\"wp-block-heading\">RepeaTork: specifications and test modes for your quality control<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The RepeaTork is ACRN&#8217;s reference motorized torque tester for quality control in serial production. Its main specifications are as follows:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Parameter<\/th><th>RepeaTork<\/th><\/tr><\/thead><tbody><tr><td>Torque range<\/td><td>1 to 25 N\u00b7m<\/td><\/tr><tr><td>Accuracy<\/td><td>0.1% FS<\/td><\/tr><tr><td>Resolution<\/td><td>0.001 N\u00b7m<\/td><\/tr><tr><td>Rotation speed<\/td><td>1 to 60 rpm<\/td><\/tr><tr><td>Data outputs<\/td><td>RS232, USB<\/td><\/tr><tr><td>Warranty<\/td><td>2 years<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The RepeaTork offers three test modes suited to different quality control scenarios:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Simple loosening test<\/strong>: measures opening torque up to the peak value. The most common mode for verification at the capper&#8217;s output.<\/li>\n\n\n\n<li><strong>Angle + torque test<\/strong>: measures torque combined with rotation angle, for closures with a safety or ratchet mechanism (child-resistant caps, tamper-evident ring closures).<\/li>\n\n\n\n<li><strong>Full test<\/strong>: loosening followed by retightening in the same automated sequence, to verify that the thread wasn&#8217;t damaged during initial application.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Results are exported in real time to a PC via RS232 or USB, compatible with common SPC software and industrial LIMS systems.<\/p>\n\n\n\n<h2 id=\"how-to-choose-between-the-repeatork-the-vortex-i-and-the-vortex-dv\" class=\"wp-block-heading\">How to choose between the RepeaTork, the Vortex-I, and the Vortex-DV?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing between <a href=\"https:\/\/www.acrn.fr\/en\/motorized-torque\/\">ACRN&#8217;s models<\/a> depends on three main criteria: production rate, the torque range to cover, and the need for structured data export.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Criterion<\/th><th>RepeaTork<\/th><th>Vortex-DV<\/th><th>Vortex-I<\/th><\/tr><\/thead><tbody><tr><td>Torque range<\/td><td>1-25 N\u00b7m<\/td><td>1.5-10 N\u00b7m<\/td><td>0.3-10 N\u00b7m<\/td><\/tr><tr><td>Accuracy<\/td><td>0.1% FS<\/td><td>\u00b10.5% FS<\/td><td>\u00b10.5% FS<\/td><\/tr><tr><td>Maximum speed<\/td><td>60 rpm<\/td><td>30 rpm<\/td><td>20 rpm<\/td><\/tr><tr><td>Recommended use<\/td><td>100% control on fast lines<\/td><td>Sampling at intermediate rates<\/td><td>Lab, R&amp;D, incoming inspection<\/td><\/tr><tr><td>Data outputs<\/td><td>RS232, USB<\/td><td>RS232, USB<\/td><td>RS232, USB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Choose the RepeaTork if your line exceeds 100 units per hour, if you need to document every closure individually, or if you have high torque values (up to 25 N\u00b7m) to measure. Choose the Vortex-DV for sampling on moderate-rate lines or for workshops handling several torque ranges at the same station. Choose the Vortex-I for lab testing, incoming inspection, or R&amp;D on low torque values starting at 0.3 N\u00b7m.<\/p>\n\n\n\n<h2 id=\"which-standards-govern-torque-testing-on-caps\" class=\"wp-block-heading\">Which standards govern torque testing on caps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several standards define torque testing methods for closures and packaging. The main ones applicable in industrial production are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/store.astm.org\/d3198-97r07.html\" target=\"_blank\" rel=\"noopener\">ASTM D3198<\/a><\/strong>: reference method for the application and removal torque of threaded or lug closures (withdrawn in 2016, but still cited in specifications).<\/li>\n\n\n\n<li><strong>ASTM D3474<\/strong>: practice for the calibration and use of torque meters used in packaging (current version D3474-23).<\/li>\n\n\n\n<li><strong>ISO 13127<\/strong>: international standard on the test method for opening torque of child-resistant closures.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.cetie.org\" target=\"_blank\" rel=\"noopener\">CETIE<\/a><\/strong>: sector recommendations used in cosmetics and perfumery for bottle opening and closing torque.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">From a quality system standpoint, clause \u00a77.1.5 of <a href=\"https:\/\/www.iso.org\/iso-9001-quality-management.html\" target=\"_blank\" rel=\"noopener\">ISO 9001<\/a> requires that any measuring equipment affecting product conformity be calibrated at defined intervals, with documented and traceable results. The RepeaTork leaves the factory with a calibration certificate. ACRN offers periodic recalibration to maintain continuous traceability.<\/p>\n\n\n\n<h2 id=\"how-to-integrate-the-repeatork-into-your-quality-system\" class=\"wp-block-heading\">How to integrate the RepeaTork into your quality system?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The RepeaTork motorized torque tester integrates into your quality system via its RS232 and USB outputs, which send each measurement result directly to a PC, SPC software, or a LIMS system. The transmitted data includes the peak torque value, cumulative rotation angle, and timestamp for each test.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This architecture meets ISO 9001 \u00a77.1.5 requirements for measurement result traceability. It allows you to build Shewhart control charts (X-bar, R) on loosening torque and detect capper drift before it generates non-conformities at the end of the line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For pharmaceutical industries subject to GMP or CFR 21 Part 11, the partner software can be configured in audit-trail mode with electronic signature. ACRN can guide you toward validated configurations for these regulated environments.<\/p>\n\n\n\n<h2 id=\"acrn-french-manufacturer-of-the-repeatork\" class=\"wp-block-heading\">ACRN, French manufacturer of the RepeaTork<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ACRN has designed and manufactured the RepeaTork in France for more than 25 years. The entire chain, mechanical design, electronics, embedded software, calibration, and after-sales service, is carried out in ACRN&#8217;s workshops. The RepeaTork ships with a calibration certificate and comes with a two-year warranty.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.acrn.fr\/en\/contact-us\/\">Request a quote<\/a> specifying your configuration (torque range, rate, IT integration). Our engineers analyze your process and recommend the test mode and torque range suited to your line.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Controlling tightening torque is only valuable if it&#8217;s systematic: the RepeaTork motorized torque tester makes this possible across an entire production run. Our <a href=\"https:\/\/www.acrn.fr\/en\/tightening-torque-for-caps-how-to-measure-and-control-it-during-production\/\">cap guide<\/a> details the standards and torque ranges applicable by industry.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tightening torque, a quality parameter often left unchecked The RepeaTork motorized torque tester brings precise, systematic quality control to threaded closures by measuring one key parameter: tightening torque. This parameter determines whether a container stays leak-tight during transport, whether the end consumer can open it without excessive effort, and whether the product complies with GMP, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14503,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[90],"tags":[],"dipi_cpt_category":[],"class_list":["post-14361","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/posts\/14361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/comments?post=14361"}],"version-history":[{"count":3,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/posts\/14361\/revisions"}],"predecessor-version":[{"id":26041,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/posts\/14361\/revisions\/26041"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/media\/14503"}],"wp:attachment":[{"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/media?parent=14361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/categories?post=14361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/tags?post=14361"},{"taxonomy":"dipi_cpt_category","embeddable":true,"href":"https:\/\/www.acrn.fr\/en\/wp-json\/wp\/v2\/dipi_cpt_category?post=14361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}