ECT guidelines for lightweight containerboard

Robyn asks:

With all these lightweight liners in our market place, is there a guideline (grid) that shows ECT / Liners / caliper that can be used by production when conducting their caliper testing on converted product?

A good question and one that is ahead of the curve. ECT can be estimated from the ring crush of STFI of the components and combined board calipers can be determined by the calipers of the liners. I’ll need to develop a table for you on this. Thank you for keeping me focused. Can you give me some initial guidance as to the flutes and grades you would be considering?

My next article in BoxScore addresses Expected Values of Combined E Flute and includes work on light weight medium as low as 14#/MSF.
-Ralph

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