Thwing-Albert SL-10 Advanced Heat Seal and Hot Tack Tester

Overview

The Thwing-Albert SL-10 Advanced Heat Seal and Hot Tack Tester is an engineered platform for quantitative evaluation of thermoplastic seal integrity across packaging development, quality control, and regulatory validation workflows. It operates on the principle of controlled thermal energy transfer under precisely regulated pressure and dwell time to replicate industrial heat sealing processes—enabling direct correlation between laboratory-scale measurements and production-line performance. Unlike single-function seal testers, the SL-10 integrates three core mechanical test modes: heat seal strength (per ASTM F88), hot tack strength (per ASTM F1921), and peel seal strength (per ASTM F904). Each mode employs independent thermal control of upper and lower jaws, dual high-resolution load cells for real-time force monitoring during seal formation and separation, and programmable pneumatic actuation synchronized to microsecond-level timing resolution. This architecture ensures traceable, repeatable data generation essential for establishing optimal sealing parameters—including temperature ramp profiles, dwell duration thresholds, and pressure gradients—for laminated films, foil composites, medical pouches, and sterile barrier systems.

Key Features

• Independent dual-zone jaw temperature control (20–400 °C), calibrated to ±0.15 °C with self-adjusting compensation per ASTM E74
• Dual high-precision load cells (362 kg total capacity) enabling simultaneous measurement of sealing force application and post-seal peel resistance
• Hot tack testing capability compliant with ASTM F1921-23, including dynamic tack onset detection at defined cooling intervals (100 ms–99 s)
• Programmable sealing time resolution of 10 ms, with ±1 ms absolute accuracy and ±2 ms repeatability for critical process window mapping
• Modular jaw configurations: interchangeable flat, grooved, or custom-profiled surfaces; selectable lengths (50.8 mm or 127 mm) and widths (6.35–25.4 mm)
• Integrated safety interlock system with dual-channel emergency stop, pneumatic pressure monitoring, and physical guard switches meeting ISO 13857 requirements
• Full-color capacitive touchscreen interface with intuitive workflow navigation, multi-user access levels, and embedded audit trail logging

Sample Compatibility & Compliance

The SL-10 accommodates a broad spectrum of flexible packaging substrates—including polyethylene (PE), polypropylene (PP), polyester (PET), aluminum foil laminates, paper-based composites, and medical-grade Tyvek®/polyethylene blends. Its modular jaw design supports both standard strip testing and specialized geometries required for pouch corner seals, fin seals, and form-fill-seal (FFS) applications. All force measurement subsystems are calibrated in accordance with ASTM E4 (Standard Practices for Force Verification of Testing Machines) and traceable to NIST standards. Thermal calibration adheres to ASTM E74 guidelines for load cell and temperature sensor verification. The instrument meets electrical safety requirements per IEC 61010-1 and is suitable for use in GLP-compliant laboratories conducting packaging validation per ISO 11607-1 and FDA Guidance for Industry: Packaging for Sterile Devices.

Software & Data Management

The SL-10 runs Thwing-Albert’s proprietary SealTest™ software, which provides full method definition, real-time curve visualization (force vs. time, temperature vs. time), and automated pass/fail analysis against user-defined specification limits. Data files are saved in encrypted .stx format with embedded metadata—including operator ID, environmental conditions (optional external humidity/temperature input), calibration status, and timestamped audit logs. Export options include CSV, PDF reports, and XML for LIMS integration. Software supports 21 CFR Part 11 compliance through electronic signatures, role-based permissions, and immutable audit trails for all method changes, calibration events, and test executions—ensuring full data integrity for pharmaceutical and medical device packaging qualification.

Applications

• Determining optimal heat seal parameters (temperature, pressure, dwell time) for new film structures during packaging development
• Validating seal integrity of sterile barrier systems per ISO 11607-2 for Class II and III medical devices
• Quantifying hot tack strength decay profiles to assess seal stability during high-speed packaging line transitions
• Comparative analysis of seal performance across different resin grades, additive packages, or surface treatments
• Root cause investigation of seal failures (leakage, delamination, channeling) in complaint investigations and CAPA workflows
• Supporting regulatory submissions with documented, reproducible test protocols aligned with ASTM, ISO, and USP / extractables/leachables packaging interaction studies

FAQ

What standards does the SL-10 support for hot tack testing?
ASTM F1921-23 (Standard Test Method for Hot Tack Strength of Thermoplastic Film and Laminates) is fully supported, including programmed cooling delay intervals and dynamic tack force acquisition.
Can the SL-10 perform peel testing without modifying hardware?
Yes—the integrated peel load cell (25 lbf, 0.1% FS) and dedicated peel jaw geometry enable ASTM F904 testing without accessory swaps.
Is compressed air supply mandatory?
Yes—pneumatic actuation is required for precise pressure control and rapid jaw cycling; the unit includes an internal pressure switch and operates optimally at 90 psi.
How is temperature calibration verified?
The system performs automatic self-calibration using embedded reference sensors traceable to NIST; full verification per ASTM E74 requires external thermocouple comparison at three points across the operating range.
Does the SL-10 support automated sample feeding?
An optional motorized turntable (127 mm jaw length) enables unattended sequential testing of up to 20 specimens per batch, with programmable indexing and position sensing.