How Pacorr Helps You Test the Edge Crush Strength of Paperboard Effectively

Pacorr offers advanced testing instruments that play a vital role in determining the edge crush strength of paperboard, ensuring that packaging materials meet industry quality standards. Among these tools, Pacorr's Edge Crush Tester stands out as a highly precise and reliable solution for evaluating the structural strength of corrugated and paper-based materials. In the packaging industry, where durability and stacking performance are critical, knowing how to properly measure edge crush strength can help avoid packaging failures during transportation or storage.
Testing the edge crush strength accurately is essential for manufacturers of corrugated boxes, paperboards, and packaging containers. It allows quality assurance teams to verify whether the paperboard can withstand vertical pressure without collapsing. Pacorr’s solutions are designed with user-friendly features and robust construction, which ensures consistent results and supports manufacturers in complying with international testing standards.

What Is Edge Crush Strength and Why Does It Matter?

Edge Crush Strength (ECS), commonly expressed in kilonewtons per meter (kN/m) or pounds per inch (lb/in), refers to the amount of force a paperboard can handle when applied vertically to its edges. This parameter is crucial because it indicates how well the paperboard will perform in real-world stacking and handling conditions. A higher edge crush value translates to greater resistance against compressive forces during storage or transit.

Importance of Edge Crush Strength Testing:

1.    Prevents box collapse during stacking.
2.    Assures the structural integrity of packaging materials.
3.    Complies with global packaging standards.
4.    Enhances customer satisfaction by improving product safety.
5.    Supports data-driven packaging design decisions.
Pacorr's Edge Crush Tester provides a highly controlled environment to measure these properties with accuracy and consistency.

Equipment Required to Measure Edge Crush Strength

To conduct edge crush test accurately, you need reliable equipment and properly prepared samples. Below is a list of tools and accessories typically required:
1.    Pacorr Edge Crush Tester – for applying compressive force.
2.    Specimen Cutter or Punch – to cut precise samples of paperboard.
3.    Caliper or Micrometer – for measuring specimen thickness.
4.    Conditioning Chamber – for pre-conditioning samples as per standard humidity and temperature.
5.    Digital Display Unit – to read and record test force values.
Pacorr ensures all essential components are built into their testing system, offering seamless integration between hardware and measurement accuracy.

Step-by-Step Guide to Testing Edge Crush Strength

1. Sample Preparation

•     Cut the paperboard specimen to a standard size (usually 25 mm x 100 mm).
•     Ensure the edges are clean and free from defects.
•     Condition the sample in a temperature and humidity-controlled chamber for 24 to 48 hours. Most standards require 23°C ± 1°C and 50% ± 2% RH.

2. Equipment Calibration

•     Ensure the Pacorr Edge Crush Tester is calibrated and zeroed before starting.
•     Load the sample vertically between the compression platens, with edges aligned perpendicularly.

3. Performing the Test

•     Set the test speed, typically 12.5 mm/min or as specified in your standard.
•     Start the test and apply compressive force until the sample collapses or deforms.
•     Record the maximum force value before failure.

4. Data Analysis

•     The edge crush strength is calculated as the peak load divided by the sample length.
•     Repeat the test on multiple samples to ensure statistical accuracy.
•     Average the values to get the final ECS rating.

Pacorr's digital edge crush tester provides real-time graph plotting and automatic result computation, improving data accuracy and ease of use.

Testing Standards Commonly Used

Testing procedures for edge crush strength are governed by international standards that help maintain uniformity and reliability. Some key standards include:
1.    TAPPI T 811 – Edgewise compressive strength of corrugated board.
2.    ISO 3037 – Corrugated fiberboard edge crush test method.
3.    ASTM D7030 – Standard test method for short-span compressive strength of paperboard.
4.    DIN EN ISO 13821 – For packaging materials like corrugated cardboard.
Pacorr designs their machines to align with these standards, allowing businesses to maintain compliance and enhance their global credibility.

Key Features of Pacorr Edge Crush Tester

Pacorr’s Edge Crush Tester is built to deliver precision and productivity. Its notable features include:

•     Heavy-duty frame to prevent any deformation during testing.
•     Digital load cell-based force measurement for high-accuracy readings.
•     Touchscreen interface for easy operation.
•     Microprocessor control system for programmable test settings.
•     Rapid sample clamping mechanism for quick testing turnaround.

These features allow manufacturers to conduct tests efficiently and minimize downtime in quality assurance processes.

Benefits of Using Pacorr’s Edge Crush Tester

1.    Enhanced Accuracy: Provides consistent, repeatable results with minimal operator influence.
2.    Time Efficiency: Fast setup and automated functions reduce time spent per test.
3.    Easy Reporting: Integrated display unit and data logging software simplify result documentation.
4.    Versatility: Compatible with single-wall, double-wall, and triple-wall corrugated materials.
5.    Compliance: Meets global testing protocols, ensuring credibility in domestic and export packaging.

Real-World Applications of Edge Crush Testing

1. Corrugated Box Manufacturers: To determine board grade and stacking performance.
2. E-commerce Packaging Suppliers: To guarantee box durability in high-volume shipping environments.
3. FMCG and Retail Brands: To validate packaging strength during storage and display.
4. Pharmaceutical Companies: For secure transportation of sensitive products in cartons.
5. Logistic and Warehouse Operators: To assess packaging safety for palletized shipments.
Pacorr’s edge crush testing solutions have helped many packaging professionals reduce return rates and product damage during transit.

Troubleshooting Common Issues in Edge Crush Testing

1. Inconsistent Results: Ensure specimens are prepared with accurate dimensions and conditioned correctly.
2. Premature Sample Failure: Check for misalignment or damage to platens.
3. Machine Drift: Regularly calibrate the machine to maintain result reliability.
4. Display Errors: Inspect load cell wiring and software configurations.
With proper training and maintenance, Pacorr’s testers remain accurate and efficient over long-term usage.

Best Practices to Improve Edge Crush Strength

1.    Use higher grammage paperboard.
2.    Improve bonding between plies using better adhesives.
3.    Optimize flute design and orientation.
4.    Maintain proper moisture levels during manufacturing.
5.    Conduct periodic strength tests to monitor batch consistency.
Pacorr’s testing instruments play a key role in helping manufacturers monitor these factors effectively and consistently.

Conclusion

Pacorr’s Edge Crush Tester provides the most reliable and efficient solution for testing the edge crush strength of paperboard. With increasing emphasis on packaging sustainability, transportation safety, and regulatory compliance, understanding and accurately measuring ECS has become critical for every manufacturer. Using Pacorr’s instruments, businesses gain a technological edge to enhance quality assurance, reduce waste, and meet industry standards confidently.
Whether you are in packaging, shipping, FMCG, or any sector that deals with corrugated materials, integrating Pacorr's edge crush testing into your quality control process is a strategic decision. Explore Pacorr’s range of equipment today and elevate your packaging reliability with precision-driven technology.