Double-wall corrugated boards
Board made from two layers of fluting sandwiched between three liners is called "twin cushion" or "double-wall" corrugated board. Different flutes may be combined in twin cushion board. Twin cushion should be used when stronger boxes and extra padding are needed. Excellent for stacking heavy items.
Buy double-wall corrugated boards
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in section "Boxes made of 2-layer cardboard "