Yasuda No.604 Film Torsion Tester
| Brand | Yasuda |
|---|---|
| Origin | Japan |
| Model | No.604 |
| Type | Manual Torsion Testing Instrument for Thin Polymeric Films and Flexible Circuit Substrates |
| Compliance | Designed for ASTM D882, ISO 527-3, and JIS K7127-compliant torsional deformation evaluation |
| Operating Principle | Mechanical torque application via calibrated handwheel with angular displacement control and fixed-end clamping |
Overview
The Yasuda No.604 Film Torsion Tester is a precision-engineered manual torsion testing instrument specifically designed for the quantitative mechanical characterization of thin, flexible polymeric films and flexible printed circuit board (FPCB) substrates. It operates on the principle of controlled angular displacement under fixed axial tension—enabling direct measurement of torsional resistance, twist stiffness, and elastic recovery behavior in specimens with thicknesses ranging from 12 µm to 250 µm. Unlike high-speed or servo-driven torsion systems, the No.604 employs a manually actuated, backlash-free handwheel mechanism that delivers repeatable, low-velocity torsional loading (0.1–5°/s typical), minimizing inertial artifacts and ensuring high reproducibility in low-torque regimes (< 5 mN·m). The device is not intended for high-throughput production line use but serves as a dedicated benchtop tool for R&D laboratories, quality assurance departments, and material certification labs requiring traceable, operator-controlled torsion protocols aligned with standardized test methods.
Key Features
- Fixed-end dual-clamp system with micrometer-adjustable parallel alignment to eliminate bending moment during torsion
- Calibrated angular scale (0–360°, ±0.5° resolution) integrated into the rotating handle assembly
- Independent axial tension adjustment (0–50 N range, ±0.2 N repeatability) via calibrated spring-loaded tensioning rod
- Modular specimen holder compatible with standard film strips (15 mm × 100 mm) and FPCB coupons (10 mm × 80 mm)
- Machined aluminum frame with vibration-damped base plate for stable operation on optical tables or QC benches
- No electrical power or software dependency—fully mechanical operation ensures long-term calibration stability and zero electromagnetic interference
Sample Compatibility & Compliance
The No.604 accommodates isotropic and biaxially oriented thermoplastic films (e.g., PET, OPP, PA, PE), metallized polymer laminates, and polyimide-based flexible circuit substrates. Specimen width is constrained to 10–15 mm; thickness must fall within 0.012–0.25 mm to ensure uniform shear strain distribution across the cross-section during torsion. Test protocols align with torsional deformation clauses in ASTM D882 (Tensile Properties of Thin Plastic Sheeting), ISO 527-3 (Plastics — Determination of Tensile Properties — Part 3: Test Conditions for Films and Sheets), and JIS K7127 (Testing Methods for Torsional Rigidity of Plastics). While not certified to ISO/IEC 17025, the instrument supports GLP-compliant documentation when used with external torque verification standards (e.g., NIST-traceable reference springs).
Software & Data Management
The Yasuda No.604 is a standalone mechanical instrument with no embedded electronics, firmware, or digital output interface. All measurements—including applied tension, angular displacement, and qualitative observation of yielding or delamination—are recorded manually in laboratory notebooks or LIMS-integrated spreadsheets. Users are advised to pair the tester with a calibrated digital torque wrench (e.g., Mark-10 MTT Series) and a high-resolution rotary encoder (e.g., Renishaw RESOLUTE™) for quantitative torque-angle curve generation. Such hybrid setups support audit-ready data capture compliant with FDA 21 CFR Part 11 requirements when implemented with electronic signature-enabled acquisition software and version-controlled SOPs.
Applications
- Evaluation of torsional modulus and hysteresis in heat-shrinkable packaging films during post-forming stress relaxation
- Comparative assessment of interlayer adhesion integrity in multilayer coextruded barrier films under twisting deformation
- Characterization of torsional fatigue thresholds in flexible electronics substrates prior to dynamic flex cycling
- Validation of annealing efficacy in biaxially oriented polypropylene (BOPP) films through torsional recovery rate analysis
- Supporting failure mode analysis in medical device packaging—particularly peelable lidstock subjected to twist-induced seal separation
FAQ
Does the No.604 provide automatic torque measurement?
No. Torque is inferred indirectly via calibrated tension and angular geometry; direct torque transduction requires external instrumentation.
Can it test metallic foils such as aluminum or copper?
Yes—within thickness limits—but yield behavior may exceed the linear torsional regime; caution is advised for materials with shear moduli > 25 GPa.
Is calibration documentation included with shipment?
A factory-verified mechanical alignment certificate is provided; users must perform periodic verification of tension and angular scales using traceable reference standards.
What is the recommended maintenance interval?
Lubrication of the handwheel gear train and clamp screw threads is recommended every 500 test cycles or annually, whichever occurs first.
Are custom specimen holders available?
Yasuda offers OEM-compatible holder inserts for non-standard widths (8 mm, 20 mm) and edge-reinforced clamps for brittle or low-modulus films—subject to minimum order quantity.
