The Internal Bond Tester—also known as a Ply Bond Tester—measures the Z-direction tensile strength of paper and paperboard. This property indicates the internal fiber adhesion, which directly affects print quality, lamination performance, converting efficiency, and resistance to delamination.
The system delivers consistent, high-energy impact using a pendulum mechanism and calibrated aluminum angles, ensuring highly repeatable and standard-compliant test results.
⭐ Key Features
- Digital display with automatic energy calculation
- High-accuracy pendulum impact mechanism
- Multiple pendulum weights available
- Quick sample mounting system
- Automatic release mechanism for consistent impact
- Rigid construction to ensure stable test performance
- Complies with global ply bond test standards
- Optional printer or software for reporting
🧪 Applications
- Paper mills
- Carton board manufacturers
- Packaging converters
- Printing industry
- Quality control and R&D laboratories
📦 Materials Tested
- Paperboard
- Coated board
- Laminated paper
- Folding box board
- White lined chipboard
- Corrugated paper components
📏 Test Standards
- TAPPI T569 – Internal Bond Strength of Paperboard
- ISO 16260 – Internal Bond Strength (Scott Type)
- GB/T 2799 – Ply Bond Strength Test
⚙️ Technical Specifications
| Parameter | Specification |
|---|---|
| Impact Energy Range | Up to 1000 J/m² (varies by pendulum) |
| Resolution | 0.1 J/m² |
| Accuracy | ±1% of reading |
| Sample Size | 25.4 × 25.4 mm |
| Clamp Pressure | Up to 60 kg/cm² (adjustable) |
| Display | Digital LCD or touchscreen (varies by model) |
| Data Output | USB/RS232/Printer (optional) |
| Body Material | Powder-coated steel |
| Power Supply | AC 220V / 50–60Hz |
🎁 What’s Included
- Main Internal Bond Tester
- Standard pendulum set
- Aluminum test angles
- Cutting die for sample preparation
- Alignment jig
- User manual
- Calibration certificate (optional)
🔧 Options & Accessories
- Additional pendulum weights
- Replacement aluminum test angles
- Sample preparation cutter (precision die cutter)
- Data software & printer
- Calibration tools
- Impact surface pads
📄 Sample Requirements
- Standard sample size 25.4 × 25.4 mm
- Conditioned according to ISO/TAPPI requirements
- Clean, flat, and free of surface contamination
- Sufficient number of samples to ensure repeatability
❓ FAQs
1. What does Internal Bond Strength measure?
It measures Z-direction fiber adhesion—crucial for assessing delamination resistance.
2. Do I need multiple pendulums?
Yes, different materials require different impact energies for proper measurement.
3. How often should the angles be replaced?
When dents, wear, or deformation are visible, as they impact accuracy.
4. Can this be used for coated board?
Yes, it is commonly used to evaluate surface-coated and laminate boards.
