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Reconstruction of the Stone Ground Wood Mill includes a new plant for wood pulp screening, refining of screen rejects and chemical pulp beating
Objectives:
to increase the mechanical strength of semi-finished products in order to reduce market pulp consumption by up to 3%;
to reduce down time of paper machines resulting from poor quality semi-products;
to improve the mechanical and printing properties of the newsprint in line with international standards: increased breaking length and density, reduced dusting and awn content.
The project involves the installation of three FS-503E fine screening systems for wood pulp and an additional line including FS-503 finescreen for refining the screen rejects.
The wood pulp that has passed through the FS-503E fine screens goes to the process, while the screen rejects are sent for refining. First, the screen rejects go to the Cleanpac-700 centric-cleaner system to remove mineral impurities (sand, abrasive materials, etc) and then to TS-3 bow screens and SP70SL screw press for thickening. The pulp is transported by screw conveyors to RGP-268 rejects refiner. The refining chamber is sprayed with water and the resulted air-steam mixture is blown to the cyclone to separate the pulp from steam. After diluting and agitation the pulp goes to FS-503 finescreen.
In addition, three FR-4 opti-finers are included to improve chemical pulp refining.
The whole reconstruction project was developed by the OAO Volga’s Design & Development Department. The equipment for the project is supplied by Metso (Finland).
Investment details:
| Amount of investments |
EUR 3.3 million |
| Payback period |
3.9 years (calculated for the total amount of investments) |
| Date of commissioning |
April 2006 |
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