Bursting strength is a vital physical metric determining paperboard's resistance to rupture under localized perpendicular force, securing safe cargo handling.
1. What is Bursting Strength? Value for Corrugated Boxes
Bursting strength (expressed in kPa or kgf/cm²) represents the physical resistance of cellulose fibers against puncture forces:
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Resisting Internal Punctures: When heavy or sharp-edged products shift inside boxes during shipping, the impact exerts perpendicular force on walls. High bursting strength ensures the board does not rupture sideways.
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Handling Protection: Ensures box structural resistance when warehouse operators grab, pull, or lift heavy pallets manually.
2. Mullen Hydrostatic Burst Testing Protocols at Chau Thai Son
Chau Thai Son audits paper properties conforming to ISO 2758 (for paper liners) and ISO 2759 (for combined corrugated boards) standards:
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Sample Conditioning: Paperboard samples are cut to size and kept in a controlled lab chamber at 23°C and 50% RH for 24 hours to reach equilibrium moisture levels.
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Mullen Tester Application: The sample is clamped between circular plates. A hydraulic pump drives oil to inflate a rubber diaphragm, pressing perpendicularly against the paperboard sample at a steady speed.
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Data Recording: The digital monitor automatically captures the peak pressure at the exact millisecond the fibers rupture, providing objective quality data.
3. Engineering Optimization and Packaging Cost Reductions
At Chau Thai Son, we analyze target board weight (GSM) and bursting strength requirements using CAD structural design tools and produce free physical mockups. This protects B2B supply chains from over-spec packaging waste or under-spec stack collapses, saving up to 15% in overall logistics packaging costs.
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