Static Compression Thresholds for Double Wall Corrugated Boxes under Moisture
Double wall static compression thresholds drop 40 to 60 percent above 80 percent humidity, requiring safety factor adjustments to prevent warehouse collapse.
FEFCO No 9
Design Standard
Industrial classification codes for corrugated packaging partition systems define standard shapes and layouts for interior fitments that organize and protect individual products. Converting plants use the FEFCO No 9 series to produce dividers, partitions, pads, and inserts without needing custom engineering designs. This standardized system simplifies the communication between buyers and manufacturers across international borders.
It reduces the time needed to draft technical specifications.
Interior Function
Protection against internal contact and scratching is achieved by dividing the inner volume of the box into separate cells. The fitments of the FEFCO No 9 series absorb impact forces and keep fragile items like bottles or electronic components from colliding with each other. This physical separation prevents glass breakage and surface abrasion.
It maintains the integrity of the product during rough transit.
Manufacturing Efficiency
Automatic assembly of these partition grids is highly dependent on precise slot width and board thickness to prevent jamming during the high-speed packing process. If the slots are cut too tight, the intersecting sheets will buckle and tear during mechanical insertion, whereas slots that are too loose will cause the grid to collapse before the products can be loaded. Packaging factories adjust their rotary die-cutters to maintain a clearance of less than one millimeter, which ensures smooth operation on high-speed filling lines and keeps the production floor running at maximum capacity.