Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F9/00—Complete machines for making continuous webs of paper
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
  • D21G1/006—Calenders; Smoothing apparatus with extended nips
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
  • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
  • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
  • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
  • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
  • D21H23/22—Addition to the formed paper
  • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
  • D21H23/56—Rolls
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
  • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material

Definitions

• the present invention relates to a method and a device for papermaking.
• Production lines for especially wood-free coated papers are frequently used for the production of various types of paper.
• gloss, satin and mats are frequently used for the production of various types of paper.
• uncoated fine papers may be mentioned.
• the conventional machine paper concept provided for this purpose consists of a paper machine with a former, a press, a pre-press section, a film application unit for a surface sizing, optionally also for a pre-coat, a hard-nip calender, which pre-sands after and at a pre-coat the film coating unit is arranged, and a reel.
• This paper machine is followed by an off-line coater with usually two to four doctor application devices, ie so-called blade coaters, which are operated at a speed that is 100 to 300 m / min higher than the paper machine in order to be able to fully follow paper machine production.
• this coater is followed by two to three multinip calenders since the operating speed of the calenders is limited due to the quality requirements for the paper with regard to smoothness and gloss got to. For example, a calender alone would not be able to process the production of the previous aggregates.
• the invention has for its object to provide an improved method and an improved apparatus for paper production, which allow for lower investment and operating costs and lower energy consumption, the production of higher quality papers.
• the method and the device both for the achievement of glossy papers, that is to achieve high-quality coated graphic papers with a roughness (measured by Parker Print Surf method, PPS-SlO, according to ISO 8791-4) of PPS in particular ⁇ 1.2 microns and preferably ⁇ l, 0 microns, and with gloss values (measured according to TAPPI T480, DIN EN ISO 8254) of gloss in particular> 70% and preferably> 74%, as well as satins and mats with gloss between 15% to 50%, preferably 20% to 40%, as well as be suitable for the production of uncoated papers.
• This object is achieved by a method for papermaking, in which the paper web after a wire section and a Press section is guided by at least two online Softnipkalander or a metal belt calender.
• the paper web after the online soft-nip calenders or the metal belt calender is preferably guided by one, in particular a single, offline multinip calender.
• the paper web Before the online soft-nip calenders or the metal belt calender, the paper web can in particular be guided by at least two on-line doctor blade applicators.
• the paper web is guided in front of the on-line soft-nip calenders or the metal belt calender before the on-line doctor blade application devices by a film applicator.
• the paper web can be pre-painted in the film applicator, for example. Basically, however, a surgeonnlei- mung conceivable.
• a film applicator is used, which is designed for both coating colors and for a surface sizing to selectively paint or glue the paper web.
• the paper web is guided through a hard nip in front of the online soft-nip calenders or the metal belt calender, in particular in front of the online squeegee application devices, in particular in front of the film applicator.
• the paper web can in particular be precalendered in the hard nip.
• the paper web is guided by at least one soft-nip in front of the online soft-nip calenders or the metal belt calender, in particular in front of the online squeegee applicators, in particular in front of the film applicator.
• the paper web after the press section and before the online Softnipkalandern or the Metallbandkalander, in particular in front of the online doctor applicators, especially in front of the film applicator, especially before the Hartnip passed through a pre-drying.
• the paper web after a wire section and a press section and preferably a dryer section successively by a particular serving the Vorkalandr réelle Hartnip, by a particular a precoat or a pre-sizing serving film applicator by at least two on-line doctor blade applicators through at least two online softnip calenders or a metal belt calender and through one, in particular a single offline multi-nip calender.
• the inventive method can be used both for the production of coated graphic papers and for the production of uncoated papers. It is particularly advantageous also if, for the production of uncoated papers, any existing application devices are lifted off and / or the ready-made filling takes place by means of the online soft-nip calender or the metal belt calender.
• the papermaking apparatus comprises a wire section, a press section, preferably a pre-drying section, a hard nip serving in particular for precalendering, a film applicator, in particular a precoating and / or a pre-sizing, two on-line doctor applicators, two online soft-nip calenders or one Metallbandkalander and / or one, in particular a single offline Multinipkalander. Only two or even more than two on-line doctor blade applicators can be provided. In addition, only two or more than two online Softnipkalander can be provided.
• At least one soft-nip can be designed as a shoe calender.
• at least one soft nip may be formed by a first and a second roller, wherein the second roller is formed with a deformable roll shell having a hard surface.
• the soft nip is formed by the deformation of the roll mantle of the second roll by the cooperation, that is, pressing, with the first roll.
• softnips are used, which are formed from a first and a second roller, wherein the first roller has a rigid shell with a deformable plastic cover and the second roller is designed as a heatable steel roller.
• the application devices for the production of uncoated paper can be lifted off.
• both matte and satin grades as well as uncoated fine paper grades can be produced directly online with the two online soft-nip calenders or the metal strip calender.
• the line load of the online Softnipkalander can be particularly for glosses> 200 kN / m.
• the surface temperature of the heating rollers can be greater than 1 10 0 C in particular.
• the line load of the online softnip calenders is set to 5 to 150 kN / m, preferably to 20 to 100 kN / m and to a surface temperature of the heating rollers of 50 to 100 ° C.
• the uncoated fine paper grades can be produced with the same operating parameters of the smoothing devices as the matt and satin grades.
• the final finish of the gloss grades can be made with the help of the one offline multi-nip calender.
• This may be carried out in particular with heated rolls, whose surface temperature is preferably at least 1 10 0 C, and a line load of particular> 350 kN.
• the offline multinip calender advantageously has at least six, preferably ten or more rolls.
• the calender may have elastic rolls with a plastic cover. It is optional with a so-called "FIy ing-Splice ", which greatly increases capacity.
• the online softnips are also created, so that two nips additionally act on the coated paper.
• the paper in front of the multinip calender has a significantly higher initial smoothness and gloss.
• a so-called soft or soft nip can be bounded on one side by a hard roller and on the other side by a soft roller.
• an intermediate storage especially for glossy paper.
• the intermediate reel storage is dimensioned so that at least 4 reels or a number of reels can be recorded, which corresponds to the production of 4 hours, preferably 8 hours.
• the intermediate reel storage is preferably arranged spatially between the end of the paper machine and, in particular single offline Multinipkalander.
• the loading of the intermediate storage preferably takes place automatically via rail systems and transverse transport vehicles. Alternatively, only stands for Tamboure, which can be loaded with a crane, may be provided.
• the intermediate storage can be arranged parallel to the production line.
• the proportion of uncoated grades, which are usually surface-glued can be produced with off-set coaters (coaters), the finished satin finish with the help of the two
• the film application device should then advantageously be suitable both for coating colors and for surface sizing
• the method according to the invention and the device according to the invention can be used in particular for the production of so-called wood-free papers, which are characterized by a composition of materials
• the top coat can be made by a simultaneous film coating or two one-sided film coating units, rather than by two on-line doctor blade applicators.
• the top coat may optionally be made by a curtain coater.
• the presetting of the base paper can be done by means of a metal belt calender.
• the final satin finish of the matt / satin grades or the intermediate satin varnish of the gloss grades can be made by means of a metal band calender instead of by means of the two softnips.

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Citations (6)

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• 2009
  • 2009-08-13 DE DE200910028511 patent/DE102009028511A1/de not_active Withdrawn
• 2010
  • 2010-06-22 CN CN2010800359067A patent/CN102472012A/zh active Pending
  • 2010-06-22 EP EP10728174A patent/EP2464785A1/de not_active Withdrawn
  • 2010-06-22 WO PCT/EP2010/058767 patent/WO2011018261A1/de active Application Filing

Patent Citations (6)

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