the.com/corrugated cardboard

Paper that lifts weights by hiding muscle in its waves.

means Cardboard made from a fluted (wavy) paper layer glued between flat liners, which makes it stiff and strong without adding much weight.

from From Latin corrugare, 'to wrinkle together' (com- 'together' + rugare, 'to wrinkle,' from ruga, 'wrinkle'). The corrugating idea shows up in the 1800s, first as a way to stiffen fabric and hat linings, then paper — a patent for corrugated paper packaging material appeared in the mid-1800s in England, and the sturdier paperboard-lined version we know as cardboard boxes developed in the decades after in the US. The word just describes the ridges; the industry built an empire of shipping boxes on top of a wrinkle.

invented for
lining tall hats in 1856
secret
fluted middle layer resists crushing, not thickness
flute sizes
named A through F, oldest largest
recyclability
reusable up to seven times before fibers weaken
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