Labthink C632B Heat Sealing & Hot Tack Tester

Overview

The Labthink C632B Heat Sealing & Hot Tack Tester is an electromechanical test system engineered for precise quantification of thermal bonding behavior in flexible packaging materials. It operates on the fundamental principle of controlled thermal activation followed by mechanical separation—measuring both immediate hot tack strength (adhesion under elevated temperature and minimal dwell time) and final heat seal strength (after full cooling). This dual-capability design enables laboratories to evaluate critical sealing window parameters—including temperature, pressure, dwell time, and cooling delay—that directly impact packaging integrity, leak resistance, and high-speed form-fill-seal (FFS) line performance. The instrument conforms to internationally recognized test standards including GB/T 34445–2017 (China’s national standard for hot tack measurement), ASTM F1921 (hot tack of thermoplastic films), ASTM F2029 (heat seal strength of flexible barrier materials), QB/T 2358 (peel strength of plastic films), and YBB 00122003 (pharmaceutical packaging requirements). Its architecture integrates high-stability PID temperature control, programmable pneumatic actuation, and multi-range load sensing to ensure repeatability across diverse material systems—from low-density polyethylene (LDPE) and polypropylene (PP) to metallized PET/AL/PE laminates and medical-grade peelable foils.

Key Features

• Four integrated test modes: Hot tack, heat seal strength, peel strength, and tensile strength—enabling comprehensive characterization without hardware reconfiguration.
• Dual-mode temperature control with ±0.2 °C stability and ±0.5 °C accuracy across a 0–250 °C range, calibrated per ISO/IEC 17025 traceable procedures.
• Programmable sealing pressure (0.05–0.7 MPa) and dwell time (0.1–999.9 s), synchronized with independent hot tack timing (0.1–999.9 s) for dynamic adhesion profiling.
• Motor-driven crosshead with six selectable test speeds (150, 200, 300, 500, 1500, and 2000 mm/min), meeting the high-velocity demand of hot tack testing per GB/T 34445–2017.
• Modular force transducer system: Standard 30 N sensor with optional upgrades to 50 N, 100 N, or 200 N—each certified to ISO 7500-1 Class 0.5 accuracy.
• Pneumatic specimen clamping (optional) ensures consistent grip force and eliminates manual alignment variability; manual clamps included as standard.
• Fail-safe operational safeguards: automatic zeroing, overload protection, stroke limit detection, real-time fault diagnostics, and thermal shielding to prevent operator contact with heated surfaces.
• Flexible activation: manual push-button or foot-switch initiation, supporting ergonomic operation in production lab environments.

Sample Compatibility & Compliance

The C632B accommodates a broad spectrum of soft packaging substrates, including monolayer films (e.g., LDPE, PP, PET), coextruded structures, aluminum foil laminates, paper-plastic composites, medical blister lidding foils, and peelable diagnostic pouches. Specimen widths of 15 mm, 25 mm, or 25.4 mm are supported via interchangeable jaws, ensuring compatibility with ASTM, ISO, and pharmacopeial test specimen dimensions. All mechanical and thermal calibrations adhere to metrological traceability requirements defined in ISO/IEC 17025. The system supports audit-ready documentation for GLP and GMP-regulated environments, with optional software modules enabling 21 CFR Part 11–compliant electronic records, user access controls, and audit trail generation.

Software & Data Management

The C632B operates in standalone mode or integrates with Labthink’s proprietary testing software (optional) for advanced protocol automation, multi-parameter curve analysis, and statistical reporting. Software-controlled sequences allow full definition of thermal profiles (ramp rate, hold time, cooling delay), mechanical parameters (speed, trigger threshold), and data acquisition frequency (up to 100 Hz). Export formats include CSV, PDF, and XML for LIMS integration. Raw force–displacement data is timestamped and annotated with environmental metadata (temperature, pressure, speed), satisfying data integrity requirements under ALCOA+ principles. Instrument firmware supports remote diagnostics and over-the-air updates to maintain compliance with evolving regulatory expectations.

Applications

Primary applications span quality assurance and R&D in food, pharmaceutical, medical device, and consumer goods packaging. Typical use cases include optimization of sealing parameters for high-speed vertical form-fill-seal lines; validation of seal integrity in sterile barrier systems per ISO 11607; evaluation of hot tack onset temperature for retortable pouches; comparative assessment of adhesive migration in multilayer laminates; and peel force characterization of child-resistant closures. Extended applications cover tensile testing of nonwovens used in hygiene products, low-speed unwind force of pressure-sensitive tapes, adhesion strength of protective films on optical displays, and delamination resistance of magnetic stripe laminates on smart cards.

FAQ

What standards does the C632B support for hot tack testing?
GB/T 34445–2017, ASTM F1921, and ISO 11607–2 Annex D.
Can the instrument perform both hot tack and cooled heat seal tests in a single workflow?
Yes—programmable thermal sequencing allows sequential hot tack measurement followed by post-cool seal strength evaluation without manual intervention.
Is pneumatic supply included with the system?
No—the C632B requires an external compressed air source at 0.7 MPa; users must provide a regulated air supply with Φ4 mm polyurethane tubing.
How is force calibration verified?
Calibration is performed using NIST-traceable deadweight standards; verification reports and calibration certificates are available upon request.
Does the system support IQ/OQ/PQ documentation packages?
Yes—Labthink provides vendor-qualified installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ) protocols aligned with pharmaceutical industry expectations.