{"id":6958,"date":"2025-07-15T13:32:24","date_gmt":"2025-07-15T05:32:24","guid":{"rendered":"https:\/\/www.qualitester.com\/?page_id=6958"},"modified":"2025-07-15T13:32:24","modified_gmt":"2025-07-15T05:32:24","slug":"finat-ftm-9","status":"publish","type":"page","link":"https:\/\/www.qualitester.com\/nb\/standards\/finat-ftm-9\/","title":{"rendered":"FINAT FTM 9"},"content":{"rendered":"

FINAT FTM 9
\nLoop Tack Testing<\/small><\/h1>\n
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Pressure-sensitive adhesives (PSAs) are essential in packaging, labeling, and other industrial applications, where their initial tack<\/strong>\u2014the ability to quickly grab a surface\u2014is critical. The FINAT FTM 9<\/strong> test method provides a reliable and standardized procedure for measuring this property through a loop tack configuration.<\/p>\n

Used globally in quality control and R&D, FINAT FTM 9<\/em> plays a crucial role in helping manufacturers select the most effective adhesive materials, particularly for high-speed automatic labeling lines. In this article, we will delve into the metode for testing av l\u00f8kkeheft<\/strong>, its importance, procedures, equipment requirements, and how Cell Instruments’ LTT-01<\/a> Loop Tack Tester<\/em> ensures compliance with the standard.<\/p>\n

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What Is FINAT FTM 9?<\/h2>\n

FINAT FTM 9<\/strong> is a standardized test method published by FINAT (the European association for the self-adhesive label industry) for determining the l\u00f8kkeheft<\/strong> of pressure-sensitive materials. Tack, distinct from adhesion or cohesion, refers to the adhesive\u2019s ability to form an immediate bond with a substrate under brief contact and minimal pressure.<\/p>\n

This method offers a practical way to compare the “grab” strength of different label or tape materials, a property that is especially relevant in fast-paced application environments such as labeling machinery.<\/p>\n

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Why Is Loop Tack Testing Important?<\/h2>\n

Den l\u00f8kkeheft<\/strong> value directly correlates with application performance, especially in systems where the adhesive must bond instantly with minimal dwell time. A high loop tack value indicates better immediate adhesion, critical in:<\/p>\n

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  • Labeling machines<\/strong> where materials must bond instantly<\/li>\n
  • Medical tape applications<\/strong><\/li>\n
  • Consumer packaging<\/strong> requiring instant closure<\/li>\n
  • Temporary bonding needs<\/strong><\/li>\n<\/ul>\n

    Accurate measurement of loop tack helps manufacturers control quality, fine-tune formulations, and meet customer performance expectations.<\/p>\n

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    Loop Tack Test Method Overview<\/h2>\n

    Den metode for testing av l\u00f8kkeheft<\/strong>, slik det er definert i FINAT FTM 9<\/em>, involves bringing a looped strip of pressure-sensitive material into contact with a standard substrate (typically float glass), then separating it at a fixed speed to measure the peak force of detachment.<\/p>\n

    Test Equipment<\/h3>\n
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    • A strekkpr\u00f8vetester<\/strong> or universal testing machine with a vertical jaw separation speed of 300 mm\/min<\/strong>, reversible direction, and force measurement up to 20 Newton<\/strong> with \u00b12% accuracy.<\/li>\n
    • A glass plate<\/strong> measuring 25 mm \u00d7 30 mm (\u00b1 tolerances), attached to a peg for mounting.<\/li>\n<\/ul>\n
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      Klargj\u00f8ring og kondisjonering av pr\u00f8ver<\/h2>\n
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      • Strips should be 25 mm wide and 175 mm long<\/strong>, cleanly cut.<\/li>\n
      • Backing material is removed just before testing.<\/li>\n
      • Strips are looped with adhesive side out<\/strong> and clamped into the tester’s upper jaw.<\/li>\n
      • Test conditions are set at 23\u00b0C \u00b1 2\u00b0C<\/strong> og 50% RH \u00b1 5%<\/strong> with a minimum 4-hour conditioning<\/strong> period for both test specimens and substrate.<\/li>\n<\/ul>\n
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        Test Procedure<\/h2>\n
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        1. Loop the adhesive strip and insert it into the upper grip.<\/li>\n
        2. Clamp the cleaned glass plate into the lower grip.<\/li>\n
        3. Bring the adhesive loop into contact with the substrate at 300 mm\/min<\/strong>.<\/li>\n
        4. Immediately reverse direction to separate the loop at the same speed.<\/li>\n
        5. Ta opp maksimal kraft<\/strong> (excluding initial noise spikes).<\/li>\n
        6. Repeat with five samples<\/strong> and report the average value in Newtons<\/strong>.<\/li>\n<\/ol>\n

          Notations:<\/p>\n

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          • If tearing occurs before adhesive release \u2192 mark with PT<\/em> (paper tear).<\/li>\n
          • If adhesive transfers to the plate \u2192 mark with AT<\/em> (adhesive transfer), noting approximate percentage.\n