Bench presser-foot thickness gauges for textiles, paper, leather and rubber are laboratory metrological instruments built specifically around the standardised test procedures for each material. Their distinguishing feature is the precise definition of the contact force, the area of application (a circular presser foot of specified size), the time for which the load is applied and the method of reading — all indispensable for measurements that are repeatable and comparable internationally. They are used in the quality control laboratories of the textile, paper, leather, rubber and plastics industries.
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The standards-based principle
Measuring the thickness of textiles, paper and leather is affected by the compressible nature of these materials: the value read depends on the force applied, on the contact area and on the time of application. To guarantee comparability between different laboratories, the product standards define rigorous protocols. For example, ISO 5084 (textiles) specifies a 2000 mm² presser foot at a pressure of 1 kPa with a stabilisation time of 10 seconds; EN ISO 534 (paper) specifies a 200 mm² presser foot at a pressure of 100 kPa; ISO 2589 (leather) has equivalent but dedicated specifications.
Instrument architecture
The typical bench instrument consists of a rigid base (a ground reference platform), a column guiding the probe, a movable upper presser foot (of the size and material the standard requires) connected to a controlled loading system (dead weights, a pneumatic system, or electric drive with force control), and a high-precision measuring system (encoder, LVDT, dial indicator) that measures the position of the presser foot relative to the base. The digital display gives the thickness directly in micrometers, with resolutions of 0.1 µm and accuracies of ±1 µm.
Applications
Applications include: the textile industry (woven fabrics, nonwovens, carpets, geotextiles, technical fabrics for filters and sportswear); the paper industry (printing paper, board, tissue, corrugated board); the leather industry (tanned hides, footwear, luxury goods); the rubber industry (sheet, profiles, molded articles, seals); the plastics industry (sheet, film, thermoformed products); and composite materials (laminates, prepreg). Thickness is a basic property of all laminated products and is governed by commercial specifications.
Reference standards
The main test standards are: for textiles — ISO 5084 (general method), ISO 9073-2 (nonwovens), EN 12127, DIN 53855; for paper — EN ISO 534, TAPPI T411 (single sheet), TAPPI T412 (board); for leather — ISO 2589, EN ISO 17186; for rubber — ISO 23529, ASTM D3767. All the standards give detailed specifications for the presser foot (diameter, material, finish), the test pressure, the stabilisation time, the number of measurements per sample and the acceptance criteria for the data. Periodic calibration with shims and gauge blocks certified to ISO 17025 is mandatory for the measurements to be valid.
Selection criteria
Choosing the right instrument depends closely on the material and on the applicable test standard: presser feet, forces and times differ for each sector. For laboratories handling several products, modular instruments are available with interchangeable presser feet and programmable test forces. For laboratories dedicated to a single product, specialized instruments with a fixed presser-foot size and force conforming to the relevant standard are preferable.
The most modern instruments incorporate electronic force control by load cell, automation of the test cycle with controlled timing, and automatic archiving of the measurements: they reduce operator-dependent variability and make integration with LIMS systems possible for complete management of laboratory data.
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