Loop Tack Test Method for Pressure-Sensitive Adhesives

Метод на изпитване

In the world of pressure-sensitive adhesives (PSAs), tack is the initial grab that allows a label, tape, or sticker to adhere upon brief contact. The Метод за изпитване на прилепване на примка has become a standardized and efficient way to quantify this critical performance property. This article offers a comprehensive guide on how to conduct loop tack testing in accordance with PSTC-16, ASTM D6195, и FINAT FTM 9, and introduces the Cell Instruments LTT-01 Loop Tack Tester—an ideal tool for quality control and R&D environments.

Understanding the Importance of Loop Tack Testing

The Метод за изпитване на прилепване на примка is widely recognized for evaluating the adhesive’s ability to form an immediate bond with a surface under minimal pressure. Unlike peel or shear tests that measure long-term bond strength, loop tack focuses on initial adhesion, making it particularly valuable for fast-moving applications such as automatic labeling, medical tapes, and temporary bonding.

Key applications include:

• Quality control in PSA tape production
• Product development of labels and self-adhesive films
• Compliance testing for ASTM D6195, PSTC-16, и FINAT FTM 9

Loop Tack Testing and Pressure Sensitive Tape Loop Tack

Test Principle and Standards Overview

Loop tack testing involves forming a loop of PSA material with the adhesive facing outward. The loop contacts a standardized test surface—usually stainless steel или glass—and the force required to detach the loop is recorded. This force, expressed in Newtons per 10 mm или pounds per inch, reflects the tack strength of the adhesive.

Стандартен	Loop Length	Surface Area	Key Notes
PSTC-16	125 mm or 175 mm	24 mm × 24 mm	Two test methods (tensile tester or loop tack tester)
ASTM D6195	125 mm (Method B) or 175 mm (Method A)	25 mm × 25 mm	Widely used in U.S. testing labs
FINAT FTM 9	175 mm	25 mm × 25 mm (glass)	Preferred in Europe for label adhesives

How to Perform the Loop Tack Test

1. Подготовка на пробата

• Cut the specimen into 125 mm (for loop tack tester) или 175 mm (for tensile tester) lengths, 25 mm wide.
• If testing unsupported adhesives, laminate them onto 2 mil PET film.
• Condition the specimens at 23°C ± 2°C и 50% ± 5% RH for at least 24 hours.

2. Surface Cleaning

Clean test panels thoroughly using acetone, MEK, или ethanol-based solvents. Perform at least three cleaning cycles, using lint-free wipes.

3. Test Setup

For Loop Tack Tester (Method B):

• Form the adhesive strip into a teardrop-shaped loop with adhesive facing outward.
• Attach the loop ends using 12 mm masking tape.
• Mount the loop on the upper jaw and bring it into contact with the test panel.
• The tester automatically applies and separates the loop at 300 mm/min.

For Tensile Tester (Method A):

• Use a vertical fixture that holds the stainless steel panel.
• Form a loop using 24 mm × 175 mm strips.
• Engage the crosshead to bring the loop into contact and then separate at 300 mm/min.

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4. Measurement and Reporting

Record:

• Maximum force (peak tack)
• Режим на неизправност (adhesive failure, cohesive failure, or adhesive transfer)
• Environmental conditions
• Backing type and coating weight

Използвайте at least three replicates per sample and average the peak values.

Избор на подходящ тестер за примки

For laboratories seeking accuracy, repeatability, and compliance. LTT-01 Тестер за захващане на петли от Клетъчни инструменти offers an optimized solution. This device fully supports ASTM D6195 Method B, PSTC-16, и FINAT FTM 9 protocols. Key features include:

• Precise force measurement with digital output
• Automated cycling for improved repeatability
• Quick-change sample fixtures for different tape types
• Удобен за потребителя интерфейс for R&D and quality control

Whether you’re a label manufacturer or a PSA developer, the LTT-01 streamlines your tack testing process and delivers standard-compliant results every time.

Contact Us Get Loop Tack Testing Solution

The Метод за изпитване на прилепване на примка е от съществено значение за количественото определяне на способността за незабавно свързване на лепила, чувствителни на натиск. Като следвате признати стандарти като PSTC-16, ASTM D6195, и FINAT FTM 9и използване на прецизно оборудване, като например Клетъчни инструменти LTT-01, лабораториите могат да гарантират надежден, повторяем, и съответствие със стандартите оценки на ефективността на лепилото.

За организации, които търсят персонализация, автоматизация или експертна поддръжка, Клетъчни инструменти предлага цялостни технически решения, съобразени с нуждите ви от изпитване на материали в областта на опаковките, медицината, фармацевтиката и други.