Tinius Olsen 20 kN Pneumatic Grip System for Fabric Testing

Overview

The Tinius Olsen 20 kN Pneumatic Grip System is a precision-engineered clamping solution designed specifically for high-reliability tensile, tear, and elongation testing of woven, knitted, nonwoven, and coated fabrics in accordance with ASTM D5034, ISO 13934-1, ISO 13935-1, and ISO 9073-3 standards. Unlike conventional mechanical or single-actuator grips, this system employs dual-synchronized pneumatic cylinders to apply uniform, centerline-aligned clamping force—ensuring zero lateral shift or sample skew during loading. The grip’s fundamental design principle leverages controlled compressive preload combined with dynamic pressure maintenance: an integrated spring mechanism delivers consistent initial clamping force prior to pneumatic engagement, eliminating slippage risk during the critical early phase of test initiation. Once actuated at 80 psi (5.5 bar), the system achieves up to 40 kN nominal clamping capacity—exceeding its rated 20 kN test-force envelope to guarantee secure retention even under high-strain deformation where specimen thickness reduction occurs.

Key Features

• Dual-pneumatic cylinder architecture ensures symmetrical force distribution across the full jaw face (25 mm × 50 mm), minimizing edge stress concentration and preventing premature specimen failure at clamping zones.
• Centerline-aligned jaw motion eliminates torsional loading—critical for maintaining specimen alignment per ISO 527-2 and ASTM D638 geometrical requirements during fabric strip or loop testing.
• Foot-operated valve control enables hands-free operation, improving operator safety and workflow consistency during repetitive testing sequences.
• Spring-preloaded initial clamping mechanism provides defined, repeatable baseline grip force before full pneumatic engagement—reducing dependency on operator technique and enhancing inter-laboratory reproducibility.
• Modular jaw face system supports rapid interchange of standardized faces (e.g., serrated, rubber-coated, grooved, and low-friction PTFE-lined) to accommodate diverse material classes including technical textiles, geotextiles, medical fabrics, and elastomeric composites.
• Designed for seamless integration into Tinius Olsen ST-Series dual-column universal testing machines—including ST-2, ST-5, ST-10, and ST-20 models—with native compatibility for Bluehill® 3 software command protocols and digital I/O signaling for automated test sequencing.

Sample Compatibility & Compliance

This grip system is validated for use with specimens ranging from 15 mm to 50 mm wide and up to 8 mm thick—including multi-layer laminates, coated substrates, and highly extensible elastane blends. Its jaw geometry and force profile comply with the mechanical interface requirements of ISO/IEC 17025-accredited textile testing laboratories. All pneumatic components meet ISO 8573-1 Class 3 purity specifications for compressed air supply, ensuring long-term seal integrity and corrosion resistance. The grip’s structural housing conforms to ANSI/BHMA A156.21 Grade 1 durability standards for industrial actuation hardware.

Software & Data Management

When deployed with Tinius Olsen Bluehill® 3 software, the 20 kN pneumatic grip supports synchronized event-triggered clamping—enabling automatic jaw closure at user-defined pre-load thresholds or time points within the test sequence. Audit-trail functionality records all grip activation events (timestamp, pressure level, cycle count) in compliance with FDA 21 CFR Part 11 and GLP/GMP data integrity requirements. Calibration metadata—including jaw face type, serial number, and last verification date—is embedded directly into test reports via Bluehill’s customizable report templates.

Applications

• Tensile strength and elongation testing of apparel, automotive upholstery, and protective workwear fabrics.
• Grab and tongue tear resistance evaluation per ASTM D5587 and ISO 9073-4.
• Burst strength assessment of woven and nonwoven medical barrier materials using diaphragm or ball burst fixtures.
• Adhesion testing of laminated composites and coated technical textiles under controlled humidity and temperature conditions.
• High-cycle fatigue evaluation of elasticized waistbands and sportswear seams using programmable load-unload profiles.

FAQ

Is this grip compatible with non-Tinius Olsen test frames?
No—this grip is mechanically and electronically optimized for Tinius Olsen ST-Series frames only; mounting interfaces, signal protocols, and safety interlocks are proprietary.
What is the recommended maintenance interval for the pneumatic system?
Inspect O-rings and valve seals every 6 months or after 5,000 cycles; replace consumables per Tinius Olsen Maintenance Bulletin MB-ST-GP-2023-01.
Can the grip be used for wet or chemically treated specimens?
Yes—standard jaw faces are anodized aluminum with optional stainless-steel or PTFE-coated variants available for corrosive environments.
Does the foot valve include emergency stop functionality?
Yes—the valve assembly integrates a fail-safe spring-return design that de-pressurizes the cylinders immediately upon foot release, meeting ISO 13857 safety clearance requirements.
How is traceable calibration performed for this grip?
Clamping force calibration requires a certified deadweight tester traceable to NIST SRM 2190; procedure documented in Tinius Olsen Calibration Procedure CP-GP-20kN-Rev.D.