GBPI GBR – Hot Tack & Heat Seal Testing Machine

The GBPI GBR is an advanced, high-precision hot tack testing machine engineered to evaluate the hot tack strength, heat sealability, and peel resistance of thermoplastic films, laminated barrier webs, coextruded polyolefins, and flexible packaging substrates. Manufactured in strict conformance with standardized hot tack protocols including ASTM F1921 (standard test methods for hot seal strength / hot tack of thermoplastic polymers and blends comprising the flexible surfaces of a package), ASTM F2029, and QB/T 2358, this state-of-the-art instrument provides packaging engineers with the precise thermal bonding data required to optimize modern high-speed packaging machinery.

In high-speed vertical form-fill-seal (VFFS) and horizontal packaging lines, packaged products (such as heavy powders, granules, liquids, or snack foods) drop directly onto newly formed bottom end-seals fractions of a second after the sealing jaws open. If the hot seal lacks sufficient cohesive bonding strength before cooling to ambient temperature, the package ruptures immediately, resulting in costly downtime and product contamination. Operating as a specialized hot tack testing machine, the GBPI GBR integrates precision pneumatic sealing jaws with a high-speed mechanical tensile peeling carriage. The instrument automatically seals the specimen under precisely controlled temperature, pressure, and dwell time, and then immediately separates the heated jaws and pulls the molten seal apart at regulated speeds up to 3,000 mm/min, accurately measuring the peak bonding force exerted while the polymer seal remains in its semi-molten state.

Dual ASTM F1921 Test Method Compliance

The GBR supports both standardized ASTM F1921 test modes: Method A (pneumatic seal separation) and Method B (spring-loaded displacement peel), giving packaging developers the ability to simulate different pouch-forming and filling mechanics accurately.

Precision Thermal & High-Speed Peel Dynamics

Independent digital PID heating circuits maintain upper and lower jaw temperatures up to 250 °C within ±0.2 °C. An ultra-fast response S-beam load cell captures instantaneous force transients at 1000 Hz data acquisition frequency.

The instrument features an integrated color touchscreen terminal and PC software displaying real-time hot tack versus temperature curves, allowing technicians to pinpoint the exact hot tack seal window and optimal packing line velocity.