Paper and board used in packaging structures must withstand various compression forces during converting, stacking, transportation, and storage. DIN 54518 defines a recognized short span compression testing method for evaluating the compressive strength of paper and board materials. A reliable short span compression tester provides manufacturers and laboratories with accurate data about material strength, helping engineers optimize packaging performance and maintain consistent product quality.
The SCT-01 Short Span Compression Tester is designed specifically for short span compression testing of papers and boards used in container and box manufacturing. By measuring the maximum compressive force a small test specimen can withstand before failure, the instrument helps determine short span compressive strength in both machine direction (MD) and cross direction (CD). This testing method is especially suitable for paper and board materials with grammage ranging from 100 g/m² to 400 g/m².
What Is DIN 54518 Short Span Compression Testing?
DIN 54518 is a test method used to evaluate the compressive strength of paper and board through a short span compression approach. Unlike traditional compression tests that may involve longer unsupported sample lengths, short span compression testing minimizes bending effects and focuses on the intrinsic compressive resistance of the material structure.
Paper and board products often fail under compression because of fiber buckling rather than tensile fracture. Measuring short span compressive strength allows engineers to better understand the load-bearing capability of paper fibers and predict packaging performance.
The test is commonly applied to materials used in:
- Corrugated packaging production
- Folding carton manufacturing
- Paperboard quality control
- Containerboard development
- Packaging material research
For packaging engineers, short span compression testing provides valuable information when selecting raw materials, improving board structures, and controlling production consistency.
Why Is Short Span Compressive Strength Important?
Compression resistance is one of the most critical mechanical properties for paper packaging materials. During transportation and storage, cartons and containers experience vertical compression loads caused by stacking weight, handling pressure, and environmental conditions.
A higher short span compressive strength generally indicates that the paper structure has better resistance against compression failure.
Testing short span compressive strength helps manufacturers:
- Evaluate raw paper and board quality
- Compare different material formulations
- Optimize fiber selection and manufacturing processes
- Predict packaging durability
- Reduce packaging failures during logistics
- Improve product reliability
For container and box manufacturers, compression performance directly affects the ability of packaging systems to protect products throughout the supply chain.
Testing Principle of Short Span Compression Testing of Papers
The working principle of a short span compression tester is based on applying a controlled compressive force to a small paper or board specimen until failure occurs.
The SCT-01 uses two precision clamps to hold a 15 mm wide test piece. The distance between the clamping jaws is controlled at 0.70 mm, creating a short unsupported span. When the clamps move toward each other, the instrument applies compression force to the specimen.
The maximum force recorded before compression failure represents the compressive strength of the tested material.
The testing process focuses on:
- Accurate specimen positioning
- Stable clamping pressure
- Controlled compression speed
- Precise force measurement
This approach minimizes sample deformation caused by bending and provides repeatable results for evaluating paper fiber compression resistance.
How Does a Short Span Compression Tester Work?
A professional short span compression tester requires a stable clamping system and precise force control to achieve reliable results.
The SCT-01 incorporates a specialized pneumatic clamping mechanism designed for consistent sample fixation.
Sample Clamping System
The instrument uses two clamps consisting of:
- A stationary jaw
- A movable jaw
- High-friction gripping surfaces
The clamping surfaces provide a gripping length of 30 ± 0.5 mm and maintain parallel alignment to ensure uniform force distribution across the sample width.
The pneumatic system applies a constant clamping force of 2300 ± 500 N, preventing sample slipping during compression testing.
Compression Measurement
During testing:
- A 15 mm × 75 mm paper or board specimen is prepared.
- The sample is positioned between the two clamps.
- The clamps apply controlled compression movement.
- The instrument records the maximum compression force.
- The result is calculated as the material’s short span compressive strength.
The SCT-01 supports testing in both machine direction and cross direction, allowing engineers to analyze directional differences in paper strength.
SCT-01 Short Span Compression Tester Features
The SCT-01 provides laboratory professionals with accurate measurement capability and practical operation features for packaging material evaluation.
PLC Control and HMI Operation
The integrated PLC control system provides stable operation and intuitive parameter adjustment. The HMI interface allows operators to easily configure test conditions and view results.
Pneumatic Sample Clamping
The pneumatic clamping system ensures stable specimen holding with adjustable pressure control. This reduces operator influence and improves repeatability.
Adjustable Test Speed
Different paper and board materials may require different testing conditions. The SCT-01 allows controlled test speed adjustment to support various material evaluation requirements.
Multiple Unit Display
The instrument displays force results in multiple units, including:
- Newton (N)
- Kilogram-force (kgf)
- Pound-force (lbf)
This supports laboratories working with different international measurement systems.
Safety Protection Design
The tester includes:
- Emergency stop function
- Over-range protection
- Stable mechanical structure
These features improve operational safety during laboratory testing.
Data Output and Reporting
An optional RS-232 interface allows connection with external systems for data management and software integration. The built-in micro printer can provide immediate test result reports when required.
Technical Specifications of SCT-01 Short Span Compression Tester
| Parameter | Specification |
|---|---|
| טווח הבדיקה | 1~500 N (or customized) |
| Compression Distance | 0.3~2 mm |
| Clamping Length | 30 ± 0.5 mm |
| מהירות הבדיקה | 3 ± 0.1 mm/min |
| החלטה | 0.01 N |
| Sample Size | 15 × 75 mm (W × L) |
| לחץ הגז | 0.4~0.7 MPa |
| גודל פתח הגז | Φ6 mm |
| ספק כוח | AC 110~220 V, 50/60 Hz |
These specifications make the SCT-01 suitable for research laboratories, paper manufacturers, packaging companies, and quality inspection organizations.
Applications of Short Span Compression Testing
Short span compression testing provides important mechanical data for industries where paper strength directly affects product performance.
Corrugated Packaging Industry
Containerboard and corrugated board manufacturers use compression testing data to evaluate material performance before converting.
Applications include:
- Raw material inspection
- Board grade comparison
- Production quality monitoring
- Packaging design optimization
Paper Manufacturing
Paper producers use short span compressive strength results to improve:
- Fiber composition
- Paper formation
- Production consistency
Packaging Research and Development
R&D engineers use compression testing results when developing lightweight packaging solutions. By understanding compression behavior, engineers can reduce material usage while maintaining structural performance.
Quality Control Laboratories
Independent laboratories and inspection organizations rely on standardized compression testing methods to verify material quality and support supplier evaluation.
Applicable Materials for Short Span Compression Testing
The SCT-01 is suitable for testing various paper-based materials, including:
- Containerboard
- Paperboard
- Corrugated packaging papers
- Packaging papers
- Industrial paper materials
It is recommended for materials with grammage from 100 g/m² to 400 g/m².
The method is designed for evaluating compressive strength and is not intended for determining strain at break.
Related Standards for Short Span Compression Testing
The SCT-01 supports testing methods associated with internationally recognized paper compression standards, including:
| סטנדרטי | Description |
|---|---|
| DIN 54518 | Short span compression testing method for paper and board |
| ISO 9895 | Paper and board compression strength evaluation |
| TAPPI T826 | Short span compression testing of paper products |
| BS 7325 | Paper and board compression testing requirements |
| GB/T 2679.10 | Paper and board compression performance testing |
| QB/T 2386 | Paper and packaging material testing method |
Selecting equipment that aligns with applicable standards helps laboratories maintain reliable testing procedures and improve data comparability.
How to Choose the Right Short Span Compression Tester?
When selecting a short span compression tester, laboratories should consider:
Testing accuracy:
The instrument should provide precise force measurement and stable repeatability.
Clamping reliability:
A secure clamping system prevents sample slipping and ensures accurate compression results.
Standard compatibility:
The equipment should support required testing methods, including DIN 54518 and related paper compression standards.
Application requirements:
Different industries may require customized fixtures, software integration, or automated testing solutions.
The SCT-01 provides a practical solution for companies requiring dependable short span compression testing of papers and boards in quality control and research applications.
סיכום
Reliable compression data helps packaging engineers select stronger materials, improve product designs, and maintain consistent quality. Cell Instruments provides professional short span compression testing solutions for paper, board, and packaging material evaluation. The SCT-01 combines accurate measurement, stable operation, and standard-compliant testing capability to support laboratory analysis and industrial quality control. Contact our technical team to learn more about suitable testing equipment, customized fixtures, and solutions for your specific material testing requirements.