Paper Technology Journal - Voith

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The initial dirt load in Fig. 9 was 1400 ppm. The first significant increase in cleanness is obtained with Flotation I, whilst the second increase is with Dispersion I including reductive bleaching. Then follow noticeable reductions after Flotation II and Dispersion II. In Flotation III cleanness is improved from approx. 20 ppm to under approx. 5 ppm. Overall the dirt speck area is reduced in this system from 1400 ppm to 5 ppm, which represents a system effi- Stock Preparation 8 9 10 HC pulping Discharge Fiberizer HD cleaning MC hole screening B MC slot screening // Flotation I HW cleaning I LC screening Washing/thickening I Dispersion I + Y bleaching Flotation II HW cleaning II LW cleaning Thickening II Dispersion II + P bleaching Flotation III Thickening III 0 Inlet coarse screening Inlet Flotation I After Flotation I After HW cleaning I After fine screening After washing After dispersion I and reductive bleaching Inlet Flotation II After Flotation II After HW cleaning II After dispersion II and peroxide bleaching After Flotation III Specific dirt speck area (B >50 mm) [mm2 /m2 100 200 300 400 1200 ] 1400 ciency of 99.65%. The process arrangement, as simulated in the Voith Sulzer’s trials, was exactly taken over for UK Paper’s project. The result is the new RCF (RCF = Recycled Fibre) plant in Kemsley as illustrated in Fig. 10. The following report by Peter Christmas, Operations Manager of UK Paper, Kemsley, describes the plant in detail. Summary The special features of the Voith Sulzer system are summarized as follows: Fig. 8: Process arrangement used for the pilot trials. Fig. 9: Reduction in specific dirt speck area through the individual process stages. Fig. 10: Simplified block diagram of UK Paper’s RCF (Recycled Fibre) plant. Process loop I Process loop II Process loop III Pulping (PreClean) Dump chest HD cleaning MC hole screening 1.2 B MC slot screening 0.2 // Flotation I HW cleaning I Fine slot screening 0.1 // VarioSplit/thickening I Double wire press I Dispersion I Reductive bleaching Flotation II HW cleaning II LW cleaning Disc filter II Double wire press II Dispersion II Oxidative bleaching Flotation III Disc filter III Storage chest PM Wet lap DAF I DAF II DAF III ■ 3 separate process loops with 3 flotation stages, 2 dispersion stages, 3 separate water loops, including 3 water treatment stages ■ Combined MC hole and slot screening and additional LC screening with a slot width of 0.1 mm ■ 2 bleaching stages in Y-P sequence ■ In-line brightness and dirt speck measurement ■ No intermediate chests, with the exception of the pulper dump chest and finished stock storage chest. 9
10 The author: Peter Christmas UK Paper, Kemsley, Great Britain Stock Preparation Division: The deinked pulp plant of UK Paper in Kemsley, Great Britain As already described in the previous report by Harald Selder, UK Paper had, after a number of comprehensive trials and studies, decided to realize the deinking project using the system design developed by Voith Sulzer Paper Technology. We also decided to transfer total responsibility for process engineering, control and instrumentation technology and commissioning to Voith Sulzer. The reason was that we did not want to start such a project without an experienced and competent complete systems partner. Voith Sulzer has considerable specialist knowledge and was also able to provide suitable plant references. The following report describes the Kemsley RCF (Recycled Fibre) plant in detail, dealing with the following areas: ■ Chronology of plant construction and process description ■ Quality development during the optimization phase ■ Cost structure and comparison with other market DIP plants. The Kemsley RCF plant General details The overall site on which the Kemsley RCF plant was built covers 54,000 m2 . The site includes two building complexes, – the warehouse for recovered paper and the machine building. 1
Page 1 and 2: 6 Paper Technology Journal News fro
Page 3 and 4: 2 The managers of Voith Sulzer Papi
Page 5 and 6: 4 Do you remember? Three years ago
Page 7 and 8: 2 6 Fig. 1: Factors influencing the
Page 9: 6 7 8 Fig. 6: Improvement in cleann
Page 13 and 14: 2 12 Fig. 2: Development in deinked
Page 15 and 16: 4 14 Fig. 4: Cost structure. Table
Page 17 and 18: 16 The author: Helmut Berger, Wepa
Page 19 and 20: 5 6 7 18 Fig. 5: Stickies area in t
Page 21 and 22: 10 20 Fig. 10: Reduction in dirt sp
Page 23 and 24: 22 The Eltmann mill of the Palm pap
Page 25 and 26: 24 With a considerable total invest
Page 27 and 28: 32 The author: Bernhard Kohl, Paper
Page 29 and 30: 5 34 Fig. 5: Web run from bottom to
Page 31 and 32: 36 The author: Harald Weigant, Andr
Page 33 and 34: 3 4 38 Fig. 3: Waste water processi
Page 35 and 36: 6 40 Fig. 6: The control room. is p
Page 37 and 38: 42 The Paper Machine Division Board
Page 39 and 40: 44 producers of board and packaging
Page 41 and 42: 46 The authors: Franz Kayser, Micha
Page 43 and 44: 48 Fig. 4: Comparison of the blacke
Page 45 and 46: 50 Since Production of winders 1995
Page 47 and 48: 6 52 Fig. 6: TORO TD for Stora Gryc
Page 49 and 50: 10 11 12 54 Fig.10: TORO SD. Fig. 1
Page 51 and 52: 56 The authors: Alessia Gasparutti,
Page 53 and 54: 3 58 Fig. 3: Forming roll covered w
Page 55 and 56: 60 Kirsten Kolvenbach in conversati
Page 57 and 58: 62 Service Center Heidenheim Tel. +
Page 59 and 60: 2 3 64 Voith Sulzer Paper Technolog
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International PAPER TECHNOLOGY 2 Ba
Page 64 and 65:
■ Established constantly sustaine
Page 66 and 67:
Since 1980 eucalyptus has played a
Page 68:
Joseph Michel and Jacques Étienne
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76 could not decide whether or not
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2 Paper Technology Journal Newsmaga
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Paper Technology Journal - Voith

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