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Process Summary

Paper production at Volga starts at the wood yard (Wood Handling Department). The incoming spruce timber is cut by the slasher saws into 1.2 meter lengths, debarked without water and delivered to the wood chippers to be reduced to chips.

The wood chips are used to produce TMP (thermo-mechanical pulp) in a two stage process involving high-pressure refining of cooked chips. The refined pulp is then screened in pressure screens, thickened in disk filters and bleached with sodium bisulphite in bleaching towers up to 62-65% brightness. Screen rejects are sent for additional refining.

TMP constitutes the paper stock, which is screened, cleaned and de-aerated before going to the paper machines.

The paper sheet formation starts on the forming table (DuoFormer, CV type) at the wet end of the paper machine. The sheet is then transferred to the press section where it is dewatered under pressure exerted by DuoCentri-2 press.

Then the paper sheet runs through steam-heated drying cylinders where the remaining water is evaporated, passes through a 4-roll calender stack to give the paper a smooth finish and is then wound at the reel.

Finally, the paper is cut by the winder into rolls of ordered size. The rolls are wrapped and labelled on the packing line and transported to the warehouse for subsequent shipment by trucks or rail to the end user.