EP0688376A1 - Papier bible et son procede de production - Google Patents

Papier bible et son procede de production

Info

Publication number
EP0688376A1
EP0688376A1 EP95906326A EP95906326A EP0688376A1 EP 0688376 A1 EP0688376 A1 EP 0688376A1 EP 95906326 A EP95906326 A EP 95906326A EP 95906326 A EP95906326 A EP 95906326A EP 0688376 A1 EP0688376 A1 EP 0688376A1
Authority
EP
European Patent Office
Prior art keywords
paper
weight
per unit
unit area
mass per
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95906326A
Other languages
German (de)
English (en)
Other versions
EP0688376B1 (fr
Inventor
Hartmut Wurster
Hans-Peter Hofmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UPM Kymmene Papier GmbH and Co KG
Original Assignee
Haindl Papier GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Haindl Papier GmbH and Co KG filed Critical Haindl Papier GmbH and Co KG
Publication of EP0688376A1 publication Critical patent/EP0688376A1/fr
Application granted granted Critical
Publication of EP0688376B1 publication Critical patent/EP0688376B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/50—Proteins
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

Definitions

  • the invention relates to a method for producing a thin printing paper, a paper produced by the method and the use of the paper.
  • Thin printing papers are mainly used for the printing of reference and catalog works, e.g. telephone books, mail-order catalogs and the like.
  • papers There are basically two types of papers here, namely so-called natural papers that do not have a special surface coating and coated or coated papers, which today generally have one have pigment coating bound with a synthetic binder.
  • the latter are also referred to as LWC papers (l ⁇ w-weight coated) or in the lowest basis weight range as ULWC papers (ultra-low-weight-coated).
  • LWC papers l ⁇ w-weight coated
  • ULWC papers ultra-low-weight-coated
  • SC papers super calendered
  • SC papers super calendered
  • Coated papers for rotogravure printing require sufficient flexibility to be able to rest on the ink cups of the rotogravure cylinder
  • offset papers require high surface strength due to the speed of the offset inks.
  • Papers with an ever lower mass per unit area are not only required for environmental reasons to reduce the amount of waste paper, but primarily for reasons of saving freight costs when transporting paper and reducing postage costs when shipping printed products, e.g. mail-order catalogs, since the weight of the information area for lightweight paper per unit weight of paper is larger.
  • the reduction in the mass per unit area of printing papers is limited for two reasons, firstly because of the still acceptable strength of the paper, which is important both for its own production in a papermaking machine and for processing on modern high-speed rotary printing presses, and secondly for reasons of the required printing opacity, which must not fall below certain values so that the paper can be printed on two sides without a printed image showing through from one side to the other.
  • Higher opacity can generally be achieved by a higher proportion of wood pulp or filler pigments in the base paper or more coating mass on the paper, but this affects the paper strength with the same area-related paper mass because the strength-forming proportion of long-fiber paper pulp generally has to be reduced.
  • Coated papers are more expensive to produce than natural papers, they also have a smoother surface that better reflects the print image, disadvantageous for reasons of environmental pollution and therefore also for reprocessing, the synthetic binder used in the coating compositions in the form of a hardened polymer dispersion.
  • Coated papers with very low basis weights are often very lobbed due to the lower proportion of raw paper and partly due to the use of the synthetic binder, which can be disadvantageous for handling. If one goes over to low basis weights with uncoated natural papers, printing opacity and printing brilliance (printing gloss) decrease and the ink streaking increases. This one known papers do not have a subsequent coating, the opacity can only be improved by increasing the proportion of filler or wood pulp in the paper itself.
  • paper strength is not only determined by the type and treatment of the paper pulp used, but also, among other things, by the uniformity of the paper sheet formation in the papermaking machine, since weaknesses of lower strength are reduced with increased uniformity, which in the end result in triggering a tear or break of the paper web are responsible. Uneven sheet formation generally also leads to uneven ink take-up, which causes the closed image to suffer.
  • bulk printing papers are also not made from pure cellulose, which would in itself give the highest paper strength, but as much mechanically or thermo-mechanically digested wood pulp or wood pulp is used, which not only has cost advantages, but also improves paper opacity and has a positive effect on the achievable printing result.
  • the wood pulp reduces the achievable paper strength, which could be obtained using pure pulp.
  • the price situation for bulk printing papers is such that such papers can only be produced cost-effectively on very powerful, fast production machines.
  • the raw material costs related to the unit area can be reduced with lower paper weights, while the costs per unit weight of paper produced can increase, since the reduction in basis weight cannot always be compensated for by an increase in machine speed by a weight-related one maintain the same production.
  • the invention has for its object to show Verfeliren for producing a thin printing paper, the mass per unit area is less than 49 g / m 2 , which is essentially free of synthetic binders, one in Compared to conventional natural paper in the range of more than 50 g / m 2, it has comparable, if not better, print quality and sufficient rigidity and strength to be produced at high machine speeds and processed in conventional rotary printing machines.
  • the new method has the features of claim 1
  • the new thin printing paper has the features of claim 23.
  • a very special advantage of the new paper is that it is suitable as surface-coated paper, in particular in a preferred embodiment in one and the same version, for both rotogravure printing and rotary offset printing at the same time. This is an absolute novelty for surface-coated papers.
  • the new paper has a cellulose content in the total fiber material of less than 40% by weight despite the low mass per unit area.
  • the proportion of cellulose in the fiber composition of a paper can be determined microscopically or indirectly chemically. These methods are known in paper testing. A microscopic determination method by defined counting of fibers in a microscopic image of a fiber suspension obtained from a paper sample is specified in the US test method TAPPI T 401 om-82. In the indirect chemical determination of the pulp fraction, the proportion of non-chemically digested fibers is determined by means of a lignin determination and the pulp fraction is then calculated as the difference. The Hägglund ligriin determination method is used for this.
  • the strength-imparting pulp portion consists of fresh pulp, generally of long-fiber softwood pulp and the rest of the pulp from ground wood or wood pulp.
  • fresh pulp generally of long-fiber softwood pulp
  • the rest of the pulp from ground wood or wood pulp In a particular embodiment of the invention, based on total fiber material, at least 15% by weight of a fiber material which is obtained from the processing of waste paper is to be used. This proportion should preferably even be over 35% by weight.
  • waste paper is not to be understood here as paper waste that arises during the manufacturing process and is recycled and dissolved again, because these wastes have the same composition as the new fiber material. Rather, waste paper is to be understood as mixed waste paper, in particular household goods and deinking goods, which are bought on the market and reprocessed in a special waste paper processing system.
  • the aim according to the invention is to use a high proportion of fibers from waste paper, this does not conflict with a minimally required proportion of cellulose, since the waste paper generally also contains a certain proportion of cellulose by which a corresponding proportion of cellulose from fresh pulp is replaced can be.
  • a proportion of cellulose of just under 40% and a proportion of waste paper fibers of around 70% are therefore not mutually exclusive. However, it is preferred to keep the pulp content in the fiber composition below 30% by weight.
  • waste paper in a paper of the type marked here was previously not common.
  • the use of waste paper can lead to a slight graying of the base paper, which is compensated according to the invention by the measures to be described below.
  • the base paper In order to impart sufficient opacity to the paper according to the invention, the base paper should already have an ash content of> 8% by weight.
  • the base paper preferably has an ash content of more than 12% by weight. This naturally means that the pulp suspension used for sheet formation must have a correspondingly higher ash content, since part of the ash leaves the freshly formed paper web with the suspension water through the sheet forming screen and is essentially circulated.
  • the sheet formation for the base paper takes place on a paper production machine, the screening speed of which is more than 700 m / min. As already mentioned at the beginning, good sheet formation is necessary in order to achieve sufficient paper strength with low basis weights. The lower the basis weight, the better the sheet formation should be.
  • a wire section for the production of the paper or base paper according to the invention which is designed at least in the form of a so-called hybrid former, a wire section with a second or upper wire, which is brought together with the lower wire shortly after the sheet formation, so that the freshly formed paper web is guided between the two screens for its further bilateral drainage.
  • a so-called gap former is preferred, in which the upper sieve is brought together with the lower sieve immediately after the material suspension has emerged, so that the first sheet formation in the converging gap between these two endlessly circulating sieves takes place with drainage on both sides.
  • a small proportion of a wet strength agent can also be used in the production of the base paper. It is preferred to work without such an agent.
  • the base paper produced has a mass per unit area of less than 46 g / m 2 , in particular less than 40 g / m 2 , particularly preferably less than 30 g / m 2 and down to about 23 g / m 2 .
  • the proportion of ash in the base paper can be more than 8 to 30% by weight, depending on the weight per unit area, preferably it is more than 12% by weight.
  • the fillers which usually give rise to the ash content and are commonly used in papermaking are known.
  • calcium carbonate, kaolin or talc and mixtures of these fillers are used for the base paper.
  • customary aids are used for either an acidic or neutral production method. If waste paper stock is also used, it is preferred to produce the base paper in a neutral suspension medium. In general, this is also a prerequisite for the use of calcium carbonate as a filler.
  • the base paper is preferably produced at screen speeds of over 1000 m / min, if the other requirements permit this.
  • the thin printing paper is provided on both sides with a naturally bound, pigment-containing surface film.
  • the characteristic "naturally bound” is intended to express that the surface film or the coating liquor for its production is free from synthetic, organic binders.
  • the natural binders used according to the invention are organic and inorganic in nature. Possible natural organic binders are, for example, casein, protein, cellulose derivatives such as carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), but in particular also starch, which has been processed accordingly (gelatinized) or, if necessary, also chemically modified. The skilled worker is familiar with the correct processing of these natural binders.
  • Esterified starches for example phosphate ester starches, but in particular etherified starches, have proven themselves here.
  • the finished paper should not be dried to a moisture content of 7% by weight. Residual moisture in the range of 8% by weight has proven to be advantageous.
  • Suitable common coating pigments for the surface treatment liquor are, for example, kaolin, natural or modified, calcium carbonate, mica and talc.
  • a possible coating liquor can contain, as usual coating pigments, only one of these pigments or a mixture of them in any ratio.
  • the surface coating for paper according to the invention consists of a mixture of natural organic binders, customary coating pigments and a swellable layered silicate, generally a sodium bentonite suitable for paper coating.
  • sodium bentonite is also a type of inorganic pigment (in the sense of the present description, it is not understood as a conventional coating pigment), it also has a binding effect on the paper coating, which is why it can also be regarded as an inorganic, natural binder.
  • a mixture of a sodium bentonite with conventional coating pigments in a weight ratio of> 20 to ⁇ 60 to 95 to 5 is provided in the broadest range, the proportion of natural, organic binder (without taking into account the bentonite, which is to be understood as an inorganic binder) in Range from 1 to 15 parts by weight, based on this pigment mixture.
  • the lower limit of the organic binder is to be understood in connection with the maximum amount of bentonite and vice versa.
  • a proportion of bentonite of at least 40 parts by weight is preferably used in the pigment mixture, the maximum addition of organic binder should not be more than 10%.
  • the bentonite content is between 40 and 60 parts by weight, based on the pigment mixture, the organic binder content being between 6 and 10 parts by weight, based on this pigment mixture.
  • Excellent results are achieved with a mixture of 50 parts by weight of sodium bentonite and 50 parts by weight of conventional coating pigments and an organic binder fraction, in particular starches, of 8% by weight, based on this mixture.
  • the usual coating pigments used are preferably essentially kaolin and calcium carbonate or mixtures of these two pigments, it also being possible to use smaller amounts of other pigments, such as titanium dioxide, to influence the whiteness and other secondary properties.
  • a starch is used as the organic binder, up to 10% of carboxymethyl cellulose (CMC) can also be added if necessary.
  • CMC generally has a thickening effect on the coating liquor, which can be dispensed with in particular in the case of higher bentonite contents. Otherwise, CMC has a negative impact on the suitability for gravure printing.
  • the solids content of the coating liquor to be processed is between 15 and 55% by weight. Because of the strong swellability of bentonite, the lower solids content applies to a higher proportion of bentonite. If the proportion of bentonite is higher, it is also expedient to also use dispersants.
  • the area-related application weight is in any case below 5 g / m 2 and paper side. An application weight between 1.5 and 2.5 g / m 2 and side is preferred. In particular if the proportion of bentonite in the coating liquor is high, the application quantity can regularly also be below 2 g / m 2 .
  • the application unit according to the invention is essentially indirect roller application devices, so-called film presses, in which the coating liquor is evenly transferred to the surface of an application roller by means of a pre-metering device, for example a wire-wound roller or a profiled doctor rod, which in turn transfers the film onto the paper surface.
  • a pre-metering device for example a wire-wound roller or a profiled doctor rod
  • work is carried out simultaneously from both sides of the paper web, with each application roller being the counter-pressure roller for the other application roller at the same time.
  • a so-called kiss mode of operation is also possible, in which the paper web is passed between them without any special pressure, only by contact with the rollers.
  • Suitable units available on the market are the film press from Jagenberg, the "Speedsizer” from Voith, the Symsizer from Valmet and the TWIN-HSM roller application unit from BTG from Sweden.
  • the surface treatment can take place in the paper making machine, but also outside in a separate unit.
  • the coating of paper with aqueous pigment suspensions places a high load on the paper, since it is soaked in the coating or coating device by the aqueous coating scar and at the same time is still exposed to high stresses from the application units.
  • the base paper to be coated must therefore have sufficient strength, especially when wet (wet strength). There are therefore limits to the reduction in the mass per unit area of a base paper to be coated, depending on the type of application unit.
  • Base papers with a pulp content of 47 to 53% by weight are less sensitive in this regard. With less than 40 or even 30% by weight of cellulose from the total fiber material, however, lightweight base papers can already produce considerable strength and thus production problems.
  • the use of a film press for the surface coating is therefore preferred.
  • the film press leads to relatively short contact times of the base paper with the coating ink, since the application quantity is pre-metered onto the application rollers and the paper only comes into contact with the correct amount of ink directly in the nip and does not come into contact with an excess which, as in the doctor blade process, again Paper itself has to be scraped off.
  • the film press also exerts only a limited mechanical load on the paper because, if necessary, it can also be operated with little or no pressure. So far it has not been possible to coat light-weight raw papers containing waste paper with a limited cellulose content according to the invention, for example by means of a doctor blade unit, as is customary in the production of light-weight gravure papers.
  • a film press for the production of the papers according to the invention has the further advantage that a relatively uniform, albeit thin film can be applied to the base paper regardless of its surface structure, which has an advantageous effect on the print result that can be achieved. If one speaks in the context of this invention of the application of a pigment-containing surface film, this does not presuppose that the film is completely self-contained. Rather, it is a coating that approximately coats the outer fibers of the paper surface to form a film.
  • the paper provided with the pigment-containing surface film is then dried accordingly and subjected to a satinizing process in order to improve the surface smoothness of the paper.
  • Thin printing papers according to the invention which are also said to be suitable for rotogravure printing, are subjected to a high satin finish.
  • the finished paper preferably has a mass per unit area of less than 44 g / m 2 , the ash content of the total paper in the case of papers made in practice being between about 12 and 25% by weight, preferably above 15% by weight. Area-related masses below 34 g / m 2 can also be achieved.
  • the thin printing paper produced according to the invention has an astonishingly good printing opacity in spite of its low mass per unit area and a surface and print reproduction quality which can hardly be achieved with a pure satinized natural paper in the basis weight range above 50 g / m 2 .
  • the thin printing paper according to the invention is also extremely environmentally friendly, because even when it is redissolved in the recycling process, because of its freedom from organic-synthetic binders, it does not produce any waste water which contains these polluting substances.
  • the thin printing paper according to the invention also has, due to good sheet formation in connection with a high ash content in the raw paper itself and the additional surface film, a desired low air permeability, which is even lower than with thin-weight coated papers.
  • the paper according to the invention also exhibits a particularly high printing gloss and a uniform ink absorption.
  • a film-forming surface treatment can be used to achieve a very uniform and closed surface, even with the smallest application quantities, which enables a high surface quality and a uniform absorption of the print despite the low basis weights.
  • the ultralight thin printing paper according to the invention is equally well suited for the two most important printing processes, namely offset printing and gravure printing.
  • MWC rapiers medium-weight coated printing papers
  • LWC papers low-weight coated printing papers
  • ULWC papers ultra-light coated printing papers
  • the surface smoothness of LWC papers is not too high in the web offset area, e.g. 1000 to 1600 Bekk seconds, so that the water contained in the base paper matrix can escape as freely as possible through the coating and ink layer when printing inks with hot air, so to create optimal surface geometries and consequently contact areas for the wells in the gravure process smoothness values in the area of 1800 to 2500 Bekk seconds required. Satinized natural papers are in the smoothness range from 1200 to 1800 Bekk seconds.
  • the paper according to the invention is suitable for gravure printing after calendering in a 10-watt supercalender at a line pressure of approximately 130 kilonewtons / m to a smoothness of only approximately 500 to 600 Bekk seconds.
  • Fig. 1 shows the schematic representation of a twin wire section
  • Fig. 2 shows the schematic representation of a film press.
  • a twin wire former of the type Duoformer CDF is shown schematically, as it was used for the production of the base paper.
  • the twin-wire former has two peripheral sheet forming screens, which are only shown in their working area, namely a lower screen 1, which is guided over a breast roller 2 in the sheet formation area, and an upper screen 3, which is also connected via a deflection roller 4 directly above the breast roller 2 the bottom wire 1 is brought together.
  • a headbox not shown in the rest
  • the paper stock suspension intended for the sheet formation passes directly between the two screens 1 and 3 in the gap between the breast roll 2 and the deflection roll 4.
  • Vacuum chambers provided on the suction roller 14 which exerts a suction effect from the side of the lower wire 1 and on which the upper wire 3 is guided away from the paper web, so that it now lies freely lying on the lower wire 1 in the further, known stations of the paper machine first, namely a press section and then a dryer section.
  • the raw paper produced which had a breaking load of 30 N in the longitudinal direction and 7 N in the transverse direction, was provided with a double-sided surface coating in the film machine itself, that is to say at the same speed of about 1300 m / min in a film press.
  • the coating color liquor contained a pigment mixture of 50 parts by weight of kaolin to 50 parts by weight of a sodium bentonite. Based on the amount of pigment, 8% starch was added as a binder, 0.8% calcium stearate as a lubricant and 1.2% of a conventional crosslinking agent. The solids content of the coating liquor was 30.2% by weight, its Brookfield viscosity 1200 mPä.s.
  • Fig. 2 shows a schematic representation of the film press used.
  • This has two application rollers 1 and 2, between which the largely dried paper web 13 can be introduced via a deflection roller 4.
  • Each of the application rollers 1 and 2 is provided with an ink metering unit 5 and 6, respectively.
  • An essential part of the ink metering unit is in each case a metering rod 7, in the exemplary embodiment a grooved metering rod with which, as can be seen from FIG. 2, a coating color layer 8 of controlled thickness is produced on the application rollers 1 and 2, which is then pressed into the press nip between the two rollers Paper web is transferred.
  • the distance of the metering rod 7 from the respective roller surface can be controlled or regulated by the actuating cylinder 9.
  • the articulated arrangement of the winding of the left application roller 1 at 10 indicates that the two application rollers can be moved apart and together.
  • the pressure with which the rollers act on the paper web can be regulated.
  • the coated paper web is fed to another dry paper (not shown) in the paper machine via a further deflection roller 11.
  • a coating color amount of 2 g / m 2 and page was applied to the paper balin.
  • the incoming raw paper had a moisture content of 6.0%.
  • the paper was not coated, but then in a 12-roll supercalender at a speed of 750 m / min, a line pressure of 190 kilonewtons / m and a temperature of 90 ° C on average to a smoothness of 1200 (top) or 1500 (Sieve side) Bekk seconds frosted. Otherwise, the previously mentioned paper test data were similar to the paper according to the invention.
  • the ink shows through (%) 16 18
  • the paper according to the invention could be printed without problems in the operational test both in the gravure printing process and in the web offset process.
  • the ink acceptance was very even and better in both printing processes than in the comparison paper. Die Druckop ⁇ . tity was somewhat higher with the paper according to the invention than with the comparison paper, the printing gloss was significantly better (paper according to the invention 35%; comparison paper 21%) and there was no bleeding through of the printing ink, which was relatively strong with the comparison paper.
  • a paper according to the invention was produced with a material composition and production data as in embodiment I, coated with a coating liquor, likewise in accordance with embodiment I, but on the basis of a base paper with a mass per unit area of 31 g / m 2 , which had a coating of 2 on each side g / m 2 was provided to give a finished paper with a mass per unit area of 35 g / m 2 .
  • This paper was compared with a commercially available, natural, uncoated SC paper of 34.5 g / m 2 , a ULWC paper of 35 g / m 2 suitable for web offset (Ro) and a gravure suitable (TD) ULWC- Paper also 35 g / m 2 .
  • the main test results of the four papers are summarized in the following table ⁇ .
  • the pressure assessment at the end of the table is of major importance. Thereafter, the paper according to the invention was well suited for both rotogravure and web offset printing (grade 2), while the specialized ULWC papers were somewhat more suitable for the particular printing process for which they were intended, but unsuitable for the other printing process were.
  • the SC paper itself which is suitable for both printing processes, was less suitable for gravure printing than the paper according to the invention.
  • the paper according to the invention was satinized to a higher smoothness than the paper according to embodiment I, so that its smoothness was roughly comparable with the commercially available ULWC papers.
  • the line weights of the coated comparison papers were about twice as high as that of the paper according to the invention.
  • the total ash content of the paper according to the invention was somewhat below that of the coated comparative papers, which is explained, inter alia, by their higher line weights. Table II

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  • Chemical & Material Sciences (AREA)
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  • Health & Medical Sciences (AREA)
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  • Molecular Biology (AREA)
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  • Making Paper Articles (AREA)

Abstract

Un papier bible avec bois d'un grammage inférieur à 49 g/m2 est pourvu d'une pigmentation de surface qui comprend comme pigment un mélange d'un silicate stratifié gonflable (Na-bentonite) et d'autres pigments usuels de couchage. Comme liant, la pigmentation de surface contient uniquement un liant organique naturel, essentiellement de l'amidon. Même avec un lissage réduit, ce papier se prête aussi bien à l'impression dans une rotative hélio que dans une rotative offset. De préférence, le papier contient en outre une certaine proportion de fibres traitées de vieux papiers.
EP95906326A 1994-01-12 1995-01-11 Papier bible et son procede de production Expired - Lifetime EP0688376B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4400609A DE4400609A1 (de) 1994-01-12 1994-01-12 Dünndruckpapier und Verfahren zu dessen Herstellung
DE4400609 1994-01-12
PCT/EP1995/000079 WO1995019468A1 (fr) 1994-01-12 1995-01-11 Papier bible et son procede de production

Publications (2)

Publication Number Publication Date
EP0688376A1 true EP0688376A1 (fr) 1995-12-27
EP0688376B1 EP0688376B1 (fr) 1998-08-12

Family

ID=6507733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95906326A Expired - Lifetime EP0688376B1 (fr) 1994-01-12 1995-01-11 Papier bible et son procede de production

Country Status (9)

Country Link
US (1) US5916420A (fr)
EP (1) EP0688376B1 (fr)
JP (1) JPH08508070A (fr)
AT (1) ATE169700T1 (fr)
CA (1) CA2157790A1 (fr)
DE (2) DE4400609A1 (fr)
ES (1) ES2121343T3 (fr)
FI (1) FI954262L (fr)
WO (1) WO1995019468A1 (fr)

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DE102015102846B4 (de) * 2015-02-27 2019-10-17 Delfortgroup Ag Dünndruckpapier mit verbesserter Opazität

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US5902453A (en) * 1995-09-29 1999-05-11 Mohawk Paper Mills, Inc. Text and cover printing paper and process for making the same
DE19745082A1 (de) * 1997-10-11 1999-04-15 Haindl Papier Gmbh Gestrichenes Rollendruckpapier mit Coldset-Eignung
NZ331438A (en) * 1997-09-16 2000-01-28 Ciba Sc Holding Ag A method of increasing the whiteness of paper by using a formulation containing a swellale layered silicate and an optical brightener 4,4-bis-(triazinylamino)-stilbene-2,2-disulphonic acid
US6391155B1 (en) 1997-10-11 2002-05-21 Haindl Papier Gmbh Coated web printing paper suitable for cold-set offset printing
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DE69919703T2 (de) * 1998-05-27 2005-09-08 J.M. Huber Denmark Aps Verwendung von kolloidalem ausgefälltem kalziumkarbonat als füllstoff bei der herstellung von papier
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US6726807B1 (en) 1999-08-26 2004-04-27 G.R. International, Inc. (A Washington Corporation) Multi-phase calcium silicate hydrates, methods for their preparation, and improved paper and pigment products produced therewith
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CN108396592B (zh) * 2018-03-09 2020-10-16 长沙理工大学 一种微涂圣经纸的制造方法
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DE102015102846B4 (de) * 2015-02-27 2019-10-17 Delfortgroup Ag Dünndruckpapier mit verbesserter Opazität

Also Published As

Publication number Publication date
EP0688376B1 (fr) 1998-08-12
CA2157790A1 (fr) 1995-07-20
FI954262A0 (fi) 1995-09-12
DE4400609A1 (de) 1995-07-13
DE59503132D1 (de) 1998-09-17
ATE169700T1 (de) 1998-08-15
ES2121343T3 (es) 1998-11-16
WO1995019468A1 (fr) 1995-07-20
FI954262A7 (fi) 1995-09-12
US5916420A (en) 1999-06-29
JPH08508070A (ja) 1996-08-27
FI954262L (fi) 1995-09-12

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