Method of making corrugated paperboard

B - Operations – Transporting – 31 – F

Patent

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154/72.16

B31F 1/24 (2006.01) B32B 3/28 (2006.01) B32B 31/12 (1980.01)

Patent

CA 1043684

Abstract of the Disclosure A method of manufacture of double-faced, multiwall, and paired single-faced corrugated boards in- cludes the step of applying a chemical gelatinization temperature depressant to the tips of the flutes of cor- rugated medium or substrate prior to application of a starch adhesive to the corrugated medium and before the last liner is bonded to the corrugated medium. The gelatinization temperature depressant enables use of lower temperatures in the hot plate section where the single- faced board plies and/or last liner are bonded to the corrugated substrate and facilitates use of a starch ad- hesive with a high total solids content which provides a good wet tack for subsequent handling of the board and minimizes board defects such as warping and washboarding caused by inefficient ant uneven moisture redistribution or removal in the hot plate section.

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