2 Water for life requires inventiveness I Daio Paper Mishima ... - Voith

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PRoDUCTs The paper industry employs film presses for the production of coated and sized paper in a broad speed range. The record-breaking production rates for packaging paper of 1,500 m/min and for coated paper of 1,700 m/min make high demands on the roll covers. The applicator roll covers have a strong and decisive effect on paper machine efficiency and paper quality. Film application process The film application process depends upon various factors. The rod premeters the amount of film applied on the roll cover. Hydrodynamic conditions under the rod, machine speed, rod diameter, rod pressure, rod grooves, coating color solids as well as the wettability of the cover, cover hardness and cover roughness all affect the amount of film. The surface of the roll cover has to be designed chemical resistance good web release/ low misting Film sizing properties of LunaFilm. 5 4 3 2 1 to enable the formation of a homogeneous film which is transported to the paper in the nip. The film transfer depends on various factors, including: film coating composition, absorption behavior of the paper, dwell time in the nip and nip pressure. To achieve an even coating color distribution and ideal runnablity of the film press, the nip width should be uniform across the whole roll face. For coating applications, the nip pressure has to be lower to minimize the penetration of the film coating color into the paper. In contrast, a higher nip load is required for starch penetration. Which roll cover is the right one? Due to the various demands of a paper machine, it is evident that only a broad product range with different features can provide the correct selection for the roll cover. LunaFilm LunaFilm combines a new rubber wear resistance wear resistance impact resistance damage resistance against dry friction material with high quality fillers and fibers. Thus, the durability is increased, the abrasion reduced and the roll cover surface optimized for the particular case of operation. LunaFilm is available in three different versions: LunaFilm S is the basic product of the new fiber reinforced Luna rubber cover series, which provides additional impact/mark resistance against paper wads and wraps. LunaFilm E is highlighted by enhanced abrasion resistance. The typical roughness value (Ra) is 1-1.5 µm. Uniform film quality and stable web run are maintained over long running periods. Film coating properties of LunaFilm and SolarCoat. 32 26 I 2008 I Voith Paper I twogether 5 4 3 2 1 impact resistance film quality good web release/ low misting film quality Conventional cover LunaFilm S LunaFilm E LunaFilm R SolarCoat
LunaFilm R provides the highest roughness. The higher initial roughness (typical Ra = 1.5-3 µm) is retained throughout cover life cycle. It is utilized when additional coating distribution/transportation onto the roll surface is required, and/or additional control of web release is needed. solarCoat SolarCoat is a polyurethane cover which is specifically designed for the film coating process. The excellent wettability of SolarCoat provides best coating film formation and splitting characteristics. Misting is minimized at very high coat weights and high machine speed. The high hydrolysis resistance maximizes hardness stability. The resulting uniform nip conditions as well as stable web release ensure a trouble-free operation during the film coating process. 26 I 2008 I Voith Paper I twogether Infobox: Benefits of LunaFilm and SolarCoat Contact Max Albrecht Rolls max.albrecht@voith.com Sergio Giuste Rolls sergio.giuste@voith.com PRoDUCTs • Consistent film quality without rod splitting due to optimized dynamic properties and surface conditions • Minimized process variations due to thermal and mechanical stability during the run cycle • Customized dynamic properties at the roll nip enabling the desired transfer of starch/coating into the substrate • Optimized sheet release, consistent sheet run and reduced misting due to customized cover surface and roughness • Longer runtime and less unscheduled downtime due to improved mechanical stability and abrasion resistance SolarCoat is a polyurethane cover with excellent wettability providing best coating film formation and splitting characteristics. 33
Page 1 and 2: twogether Paper Technology Journal
Page 3 and 4: Dr. Hans-Peter Sollinger, Member of
Page 5 and 6: … inventiveness RePoRT
Page 7 and 8: Most of it is salt water or water t
Page 9 and 10: ecirculated into the production pro
Page 11 and 12: Project milestones • Ground break
Page 13 and 14: offers the ideal solution for every
Page 15 and 16: newsprint: nP 400 DuoFormer TQv Tan
Page 17 and 18: twogether: Let's take an example. W
Page 19 and 20: ted controls should be replaced by
Page 21 and 22: Storage tower inflow Disperger 2 in
Page 23 and 24: In the past the operating speed of
Page 25 and 26: Paper quality you can taste! Voith
Page 27 and 28: Up to 25% energy savings not only s
Page 29 and 30: obtained and compared, orders have
Page 31: SpeedSizer film press with Luna rol
Page 35 and 36: kW 1,400 1,200 1,000 800 600 400 20
Page 37 and 38: worst case. Spreader rolls countera
Page 39 and 40: must remain stable and at adequate
Page 41 and 42: Improvement of the roughness with P
Page 43 and 44: the increased use of shorter recycl
Page 45 and 46: Wood fibers are separated and prepa
Page 47 and 48: while stabilizing the vacuum level
Page 49 and 50: The same Nipcorect roll in the rebu
Page 51 and 52: The product transfer from Vancouver
Page 53 and 54: Thanks to the Atmos development, hi
Page 55 and 56: Talagante paper mill belongs to Chi
Page 57 and 58: process pumps, agitators hall venti
Page 59 and 60: Learning how to make paper was stil
Page 61 and 62: After learning you can test your kn
Page 63 and 64: In fact, one could compare a roll t
Page 65 and 66: News from Development Research and
Page 67 and 68: Formation is one of the most import
Page 69 and 70: Pilot installation SafeTailing - dr
Page 71 and 72: industry “into its own hands.”
Page 73 and 74: Originally built as the PM 407 in 1
Page 75 and 76: Ming Ming Liu, President Voith Pape

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