Abstract: Disclosed is an apparatus for the continuous stacking of paperboard blanks issuing from a continuously running corrugator capable of producing orders of blanks of different sizes. The stacking apparatus includes a vacuum control box and a variable speed endless conveyor belt which is adapted to speed up and create a gap between the blanks of various sizes. In operation the gap provided allows the blanks of one size to be stacked without interrupting the continuous running of the corrugator.

Abstract: A method of stacking corrugated paperboard blanks issuing from a corrugator that produces parallel streams of blanks from an advancing endless web by shingling the blanks from each of the streams and advancing them to lineally displaced stacking stations where a predetermined number of blanks are accumulated and then interrupting the flows of blanks for removing stacks of blanks from the stacking stations. Suitable apparatus for performing the method includes vertically displaced, parallel shingling conveyors which advance the shingled blanks to lineally displaced stacking platforms and a gating apparatus at the downstream end of each conveyor to interrupt the flow of blanks while the stacks are removed from the platforms. The output end of the lower conveyor rises to compensate for the increasing height of the stack on its associated platform while the other platform falls to similarly compensate for the increasing height of the stack thereon.