Heat Seal Tester (Single / Five-Point / Intelligent)
Prepares heat-sealed specimens at set temperature, time and pressure; the five-point model produces five seals at different temperatures in one cycle, cutting process-window development time to one fifth.
Purpose | What it does for you
Heat-seals plastic materials at set temperature, dwell time and pressure to prepare standard specimens for seal-strength testing. When qualifying new materials or suppliers, or troubleshooting seal defects, you need designed experiments to find the optimal sealing window. The STH-C five-point model produces five temperature-gradient seals in one cycle and the STH-E intelligent model adds richer programme control, markedly improving process development efficiency.
Key Features
- Digital display control system with fully automated operation
- Digital PID temperature control with high accuracy (±1 °C)
- Dual-cylinder structure with internal pressure balancing for uniform seal pressure
- Pneumatic components from internationally renowned brands, high precision
- Anti-scald and leakage protection design for safer operation
- STH-C: six independently controlled sealing heads yield five temperature gradients in one run
Operating Principle
The instrument heats the sealing jaws to the set temperature; under foot-switch or automatic control it seals the specimen at the set pressure and dwell time. Temperature is controlled by digital PID, and the jaw material with custom heating elements keeps the sealing surface uniform. A dual-cylinder structure with an internal pressure-balancing mechanism keeps pressure even along the whole seal.
Technical Specifications
| Heat-Sealing Temperature | RT~250 ℃, ±1 ℃ |
|---|---|
| Heat-Sealing Pressure | 0.05–0.7 MPa |
| Heat-Sealing Time | 0.01–99.99 s |
| Sealing Surface | STH-B: 300 mm × 10 mm; STH-C: 40 mm × 10 mm × 5 pcs |
| Temperature Gradient | ≤20 ℃(STH-C) |
| Gas Supply Pressure | ≤0.7 MPa |
| Dimensions | 550 × 330 × 515 mm (L×B×H)(STH-B)/ STH-C:500 × 330 × 515 mm |
| Net Weight | 33 kg(STH-B)/ 35 kg(STH-C) |
| Power Supply | AC 220/110 V ±10%,50/60 Hz |
| Power | <1500 W |
Note: Due to continuous product iteration and varying application conditions, the technical parameters on this page are typical reference values and are not to be used as acceptance criteria. For tender and customized projects, the product model, configuration and specifications are subject to the mutually confirmed technical agreement and the actual delivered product. For parameter matching tailored to your specific project, please contact us.
Standard Configuration
Main unit and foot switch (user supplies compressed air). Final scope per the configuration list.
Application Scenarios
- Heat-sealing process window development and parameter confirmation for flexible laminates
- Sealing performance comparison when introducing a new supplier's material
- Root-cause investigation of seal leaks and weak seals
- Standard specimen preparation for pharmaceutical packaging seal strength (YBB 00122003)
Compliance Standards
Industries Served
- Packaging & Printing
- Food & Condiments
- Pharmaceutical & Biopharmaceutical
- Medical Devices
- Plastics & Rubber
- Third-Party & Government Testing Institutes
- Material R&D, Universities & Institutes
Frequently Asked Questions
Do I need a tensile tester for seal strength testing?
Yes. The heat seal tester prepares specimens at the set parameters; the seal strength value is then measured by a tensile tester fitted with a seal-strength fixture. The two are complementary and we configure them together in a solution.
Does LabStone support OEM/ODM and customised instruments?
Yes. Standard models ship as-is, while chamber count, specimen size, fixtures, temperature range and software modules (including the GMP Computerized System module) can be tailored to your SOP and URS. IQ/OQ/PQ validation documentation packages are available.
What is the typical lead time, and how is shipping handled?
Standard models usually ship in 4–8 weeks; customised builds depend on the agreed scope. Instruments are packed in export wooden cases and can move by sea, air or rail. We supply proforma invoice, packing list and certificate of origin (CO / Form E), and work under EXW, FOB, CIF or DAP terms.
How are installation, training and calibration handled after delivery?
We provide remote installation guidance, bilingual (Chinese/English) manuals and video training; on-site commissioning by our engineers is available. Users can self-calibrate with standard weights, reference films or calibrated leak standards, and third-party calibration certificates can be supplied.
What is the warranty, and how are spare parts supplied?
The instrument carries a 12-month warranty from acceptance plus lifetime maintenance support. Consumables (molecular sieve, desiccant, sealing grease, printer paper) are kept in long-term stock, and key components are international brands available worldwide. We respond to technical enquiries within 24 hours.
Do the instruments comply with ASTM, ISO and pharmacopoeia standards?
Yes. Every instrument lists its applicable standards on the specification page (ASTM, ISO, GB, YBB, Chinese Pharmacopoeia, USP, EP, JIS, DIN, TAPPI and more). The software outputs raw records and reports suitable for audit trails, with an optional GMP / FDA 21 CFR Part 11 compliance module.
Which languages does the software support, and can it integrate with a LIMS?
The software ships with Chinese and English interfaces; other languages can be added on request. Data export is available over RS232, USB, Ethernet or Wi-Fi, and reports can be exported to Excel, PDF or structured files for LIMS integration.