A process for producing sheet material

摘要

Corrugated board is produced by bonding an inner liner web to a corrugated intermediate web in a single facer 3 or 27. A second outer liner web is then applied in a double facer 16. A web of corrugated board 6 or 31 is then directed upwardly to a rotary shearing station 35 for cut-off as required, at the end of an order run. The web 6 or 31 is then directed upwardly to one of two streams which are led upwardly to a double level cut-off knife 45 which forms sheets cut to a desired size. The cut sheets are delivered to upper or lower stacking stations 50, 51 where they are downstacked on beds which are lowered and stacked sheets are led along roller conveyors to a mobile trolley. Any sheets 109 which are warped are passed between a pair of backing rollers 110, 111 and an adjustable bending roller 115 is urged downwardly against the bow of the sheet 109 to correct the warp. Dust generated in the cutting step is removed by ionising dust particles, vibrating the particles and removing them by vacuum.