Virgin SBS against White Lined Chipboard for Retail Facings
Virgin SBS provides superior print brightness, stiffness consistency, and crack-free scoring, whereas recycled board lowers initial cost but adds waste.
BCT ISO 12048
Standardized Compression
Standard packaging protocols specify a compression test to determine the load-bearing capacity of finished boxes under quasi-static loading. The methodology defined in bct iso 12048 applies a constant rate of platten movement to a filled or empty transport package until failure or a predetermined load limit occurs. It defines the geometry of the test platten, the atmospheric conditioning of the corrugated board, and the reporting of maximum load and deformation.
This procedure does not predict dynamic vibration forces. In comparison, the protocol restricts itself to uniform static pressure.
Force Application
Compression testing machines run at a fixed rate of ten millimetres per minute. During a run under bct iso 12048, the platten descends until the board buckles. Platten parallelism remains essential because an uneven angle introduces lateral forces that skew the ultimate force reading.
The instrument records both the peak force and the displacement curve.
Structural Limit
Environmental factors dictate the practical limits of these dry measurements because high humidity weakens cellulose fibres. Under bct iso 12048, boxes must undergo conditioning at standard temperature and humidity for twenty-four hours before the compression cycle begins. Moisture weakens the flute structure, which lowers the maximum load.
This testing guides the stacking height of pallets in dry warehouses.