GBPI SLY-S1 – Elmendorf Tear Tester (Digital Tearing Resistance Apparatus)
- Precision electronic elmendorf tear tester for internal tearing propagation resistance of flexible webs
- Full testing compliance with ASTM D1922, ISO 6383-2, TAPPI T414, GB/T 11999, and ASTM D1424
- Broad modular capacity range from 0 to 6400 gf (up to 64,000 mN) with interchangeable pendulum weights
- Advanced optical angular encoder measuring residual swing angle with high analytical resolution
- Pneumatic specimen clamping and automatic pneumatic pendulum drop release mechanism
- Integrated sharp safety slitting blade creating standardized initial prep-notches with repeatable geometry
- Standalone microprocessor display computing tearing force, energy absorption, and multi-specimen averages
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The GBPI SLY-S1 is an advanced, microcomputer-controlled elmendorf tear tester engineered for measuring the force required to propagate an initiated tear across flexible plastic films, laminated packaging foils, papers, paperboards, non-wovens, and technical woven fabrics. Built in rigorous accordance with internationally recognized material testing protocols—including ASTM D1922 (standard test method for propagation tear resistance of plastic film and thin sheeting by pendulum method), ISO 6383-2, TAPPI T414, and GB/T 11999—this instrument delivers certified physical strength evaluation for flexible conversion materials.
Tear resistance is an indispensable functional characteristic in consumer packaging design. Certain applications, such as easy-open snack pouches and pharmaceutical sachets, require controlled, linear tear propagation along oriented film lines. Conversely, heavy-duty shipping sacks, agricultural stretch wraps, and pet food bags demand superior tear containment to prevent sudden web splits when nicked or snagged during transit. Functioning as a high-precision elmendorf tear tester, the SLY-S1 holds a rectangular specimen between two pneumatic clamps, cuts a standardized starting slit using an integrated cutting blade, and drops a balanced swinging pendulum to complete the tear.
Optical Angular Encoding & Modular Pendulum Range
The instrument incorporates a precision photoelectric angular encoder that accurately tracks the pendulum swing angle as kinetic energy is expended in tearing through the substrate. Modular auxiliary weight increments expand test capacity from delicate 200 gf thin plastic wraps up to 6400 gf heavy-duty industrial cardboards and non-woven substrates without sacrificing measurement resolution.
Automated Pneumatic Handling & Data Processing
Pneumatic specimen clamping and automated pendulum drop eliminate operator-to-operator variance, ensuring consistent clamping pressure without edge slippage. The integrated digital console automatically displays tear force in millinewtons (mN) and grams-force (gf), logging batch statistical parameters including mean values, standard deviations, and coefficients of variation.
Widely deployed in film extrusion plants, paper mills, flexible converting facilities, and research laboratories, the SLY-S1 guarantees dependable tear propagation verification for optimized packaging performance.
GBPI SLY-S1 Elmendorf Tear Tester – Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Test Principle | Elmendorf Dynamic Pendulum Tearing Energy Loss Method |
| Applicable Standards | ASTM D1922, ISO 6383-2, TAPPI T414, GB/T 11999, ASTM D1424, ASTM D689 |
| Tearing Capacity Range | 0 to 6400 gf (0 to 64,000 mN / 64 N) with Modular Auxiliary Weights |
| Modular Weight Capacities | Standard: 200 gf, 400 gf, 800 gf, 1600 gf, 3200 gf, 6400 gf |
| Tearing Radius Arm | 104 ± 1 mm (Radius from rotation axis to specimen clamp center) |
| Initial Tearing Angle | 27.5° ± 0.5° (Standardized initial release posture) |
| Specimen Clamping & Release | Pneumatic Specimen Clamps & Pneumatic Pendulum Release Mechanism |
| Initial Slit Cutting Blade | Built-in Tempered Steel Notch Cutter (20 ± 0.5 mm Standard Cut Slit) |
| Specimen Dimensions | 63 mm × 75 mm (Standard Elmendorf Rectangular Coupon) |
| Gas Supply Pressure | 0.6 MPa (Clean Dry Compressed Air) |
| Instrument Dimensions | 480 mm (L) × 380 mm (W) × 560 mm (H) |
| Instrument Net Weight | Approximately 28 kg |
| Power Supply | AC 220V ± 10%, 50 Hz / 60 Hz Single Phase |
Key Performance Features of the GBPI SLY-S1
- High-Resolution Optical Encoder: Accurately measures residual pendulum swing arcs with digital precision, eliminating parallax estimation errors and friction drag inherent in legacy pointer scales.
- Broad Modular Testing Span: Interchangeable calibrated pendulum weight attachments enable testing from thin 10-micron polymer films up to thick solid bleached sulfate (SBS) board and woven canvas.
- Dual Pneumatic Operation: Pneumatically powered sample clamping ensures uniform clamping force across specimens, while pneumatic pendulum release guarantees zero-deflection initiation.
- Precision Integral Notching Blade: Integrated lever-actuated razor knife produces an exact 20 mm starter notch perpendicular to the clamp edge, ensuring strict compliance with ASTM D1922 geometry.
- Automatic Friction Calibration: Microprocessor automatically executes bearing friction and air resistance compensation routines to deduct parasitic energy losses from final test results.
- Intuitive Digital Microcomputer: Backlit LCD display presents immediate force readouts in gf and mN, storing multiple specimen passes to compute real-time averages, standard deviation, and range.
Standard Package & Accessories
| Item | Description | Quantity | Type |
|---|---|---|---|
| 1 | SLY-S1 Elmendorf Tear Tester Mainframe with Optical Encoder | 1 Set | Standard |
| 2 | Basic Basic Pendulum Body (200 gf / 400 gf Capacity) | 1 Set | Standard |
| 3 | Interchangeable Calibrated Pendulum Weights (800 gf, 1600 gf, 3200 gf, 6400 gf) | 1 Set | Standard |
| 4 | Integrated Precision Specimen Notching Blade Mechanism | 1 Set | Standard |
| 5 | Replacement Notching Blades | 5 Pcs | Standard |
| 6 | Pneumatic Compressed Air Tubing and Connectors | 1 Set | Standard |
| 7 | Factory Calibration Verification Certificate and User Guide | 1 Set | Standard |
Primary Testing Applications
Plastic Packaging Films & Pouches
Evaluating machine direction (MD) and transverse direction (TD) tear propagation in PE, PP, PET, and oriented nylon films for pouch converting and snack packaging.
Paper, Board & Corrugated Medium
Measurement of internal tearing resistance in kraft wrapping paper, envelope paper, linerboard, and paperboard packaging materials per TAPPI T414.
Medical Packaging & Non-Wovens
Tear durability testing for spunbond non-woven fabrics, surgical drape materials, medical sterile pouches, and protective apparel webs.
Technical Textiles & Coated Fabrics
Verification of tear strength in woven synthetic fabrics, automotive upholstery, coated tarpaulins, and industrial geotextiles.