Labthink GHS-03 Heat Sealing Tester
| Brand | Labthink |
|---|---|
| Model | GHS-03 |
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Heat Seal Temperature Range | 25–250 °C |
| Heat Seal Pressure Range | 0.1–0.7 MPa |
| Seal Time Range | 0.1–999.9 s |
| Temperature Control Accuracy | ±0.2 °C |
| Temperature Uniformity (Gradient) | ≤20 °C across sealing surface |
| Sealing Surface Dimensions | 40 mm × 10 mm × 5 independent heads |
| Pneumatic Interface | Ø8 mm polyurethane tubing |
| Required Air Supply | 0.1–0.7 MPa (user-supplied) |
| Power Supply | AC 220 V, 50 Hz |
| Net Weight | 72 kg |
| Dimensions (L×W×H) | 576 × 430 × 510 mm |
Overview
The Labthink GHS-03 Heat Sealing Tester is a precision-engineered instrument designed for quantitative evaluation of heat seal integrity in flexible packaging materials. It operates on the principle of controlled thermal compression—applying defined combinations of temperature, pressure, and dwell time to replicate industrial heat sealing conditions in a laboratory setting. This enables objective assessment of seal initiation temperature, optimal sealing window, and ultimate seal strength across diverse substrates including plastic films (e.g., LDPE, PP, PET), laminated structures (e.g., PET/AL/PE, OPP/CPP), coated papers, and pharmaceutical blister lidding foils. The device supports standardized seal parameter optimization under regulated test protocols, making it essential for R&D validation, incoming material qualification, and process capability studies in food, pharmaceutical, medical device, and consumer goods packaging.
Key Features
- Five independently controlled heating heads—each driven by a dedicated pneumatic cylinder—enable simultaneous multi-condition testing (e.g., five discrete temperatures at fixed pressure/time), significantly improving throughput and statistical robustness.
- Digital PID temperature control ensures rapid thermal stabilization (<60 s to setpoint) and maintains ±0.2 °C accuracy over the full 25–250 °C operating range, critical for detecting narrow sealing windows in high-barrier or heat-sensitive laminates.
- Wide parametric flexibility: adjustable seal pressure (0.1–0.7 MPa), dwell time (0.1–999.9 s), and programmable ramp/soak profiles accommodate both low-force foil seals and high-pressure retort pouch applications.
- Integrated safety architecture includes dual-mode operation (manual button + foot switch), thermally insulated upper platen housing, and automatic thermal cutoff—compliant with IEC 61000-4-2 and ISO 13857 ergonomics guidelines.
- Microprocessor-based controller with backlit LCD, PVC membrane keypad, and intuitive menu navigation simplifies method setup, real-time monitoring, and result recall without external software dependency.
- Modular thermal design features quick-disconnect heater terminals and independently controllable top/bottom platens—facilitating calibration verification, maintenance, and configuration for asymmetric sealing (e.g., heated top/cold bottom).
Sample Compatibility & Compliance
The GHS-03 accommodates flat, non-porous specimens up to 100 mm wide and 150 mm long, with thicknesses ranging from 20 µm (thin PET film) to 300 µm (retort-grade laminates). It is validated for use with FDA-listed food contact polymers, USP compliant pharmaceutical packaging components, and ISO 8536-1/2 certified parenteral container seals. The instrument fully satisfies the mechanical and procedural requirements of QB/T 2358–1998 (Chinese standard for plastic film heat seal strength), ASTM F2029–22 (Standard Test Method for Measuring Heat Seal Strength of Thermoplastic Flexible Barrier Materials), and YBB 00122003–2015 (Chinese Pharmacopoeia standard for heat-sealable packaging materials used in sterile pharmaceuticals). Its sealed pneumatic actuation and traceable temperature calibration support GLP-compliant documentation and 21 CFR Part 11–ready audit trails when paired with Labthink’s optional data acquisition module.
Software & Data Management
While the GHS-03 operates as a stand-alone unit with embedded firmware, its RS232 interface enables bidirectional communication with Labthink’s proprietary SealMaster™ PC software (optional). This platform provides automated method sequencing, real-time graphing of thermal profiles, statistical analysis (mean, SD, CPK), PDF report generation with digital signatures, and export to CSV/Excel formats. All stored test records include timestamp, operator ID, environmental conditions (ambient T/RH if sensor-equipped), and full parameter metadata—meeting ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) for regulatory submissions. Firmware updates are delivered via USB memory stick, ensuring long-term compliance with evolving industry standards.
Applications
- Determining minimum seal initiation temperature (SIT) and maximum hot-tack failure temperature for coextruded sealant layers.
- Mapping seal strength vs. temperature curves to identify optimal sealing windows for vertical form-fill-seal (VFFS) and horizontal form-fill-seal (HFFS) lines.
- Validating seal integrity after accelerated aging (ASTM F1980) or sterilization (EO, gamma, steam) for medical device pouches.
- Comparing seal performance between alternative adhesives, corona-treated vs. plasma-treated surfaces, or recycled-content resins.
- Supporting root-cause analysis of seal leaks, wrinkles, or delamination observed during production line trials or field complaints.
- Generating technical dossiers for packaging validation per ISO 11607-1 and EU Annex 15 requirements.
FAQ
What standards does the GHS-03 comply with?
It meets QB/T 2358–1998, ASTM F2029–22, and YBB 00122003–2015, and its design supports alignment with ISO 11607-1, USP , and FDA 21 CFR Part 11 when integrated with appropriate software and SOPs.
Is an air compressor included with the instrument?
No—the GHS-03 requires an externally supplied clean, dry compressed air source (0.1–0.7 MPa) connected via Ø8 mm polyurethane tubing; users must provide and maintain this utility per ISO 8573-1 Class 3 specifications.
Can the GHS-03 measure seal strength directly?
No—it is a heat seal parameter optimization system, not a tensile tester. Seal strength must be measured separately using a force tester (e.g., Labthink XLW series) per ASTM F88 or ISO 11607-2.
How is temperature uniformity verified across the five sealing bars?
Labthink provides a NIST-traceable calibration certificate documenting gradient ≤20 °C across each 40 mm × 10 mm sealing surface, measured using calibrated surface thermocouples at nine points per bar.
What maintenance is required for long-term reliability?
Recommended quarterly inspection includes pneumatic valve cleaning, heater resistance verification, and thermal interface paste reapplication; full calibration is advised annually or after 5,000 cycles.
