Global Percent of Medium

Mike asks,

I have a question on what the % medium should be globally. I’m trying to get a handle on it algebraically so to speak.

Classic corrugated sheet, in my mind, is one 26# medium sheet and two 42# liner sheets.  The medium has a wiggle factor of ~1.3 so,

Medium % = 26*1.3/(26*1.3+42*2) = ~ 29%.

Does this sound reasonable?  As BWs tend downward, my gut tells me there is more % medium overall but I am thinking still less than a third.

Twenty five years ago, here, it was indeed 42/26/42 with C flute having a take up factor of 1.43.  Then the sheet feeders began to request 23# medium and corrugating rolls started to have lower profiles which reduced the take-up factor.  Then we moved to 35# and today that probably is 33/23/33.  Globally the World Containerboard Organization tracks total containerboard production.  Additional information may be available through them.

— Ralph

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