EP2109697A2 - Substrat d'impression - Google Patents

Substrat d'impression

Info

Publication number
EP2109697A2
EP2109697A2 EP08737606A EP08737606A EP2109697A2 EP 2109697 A2 EP2109697 A2 EP 2109697A2 EP 08737606 A EP08737606 A EP 08737606A EP 08737606 A EP08737606 A EP 08737606A EP 2109697 A2 EP2109697 A2 EP 2109697A2
Authority
EP
European Patent Office
Prior art keywords
printing
substrate
ink
calcium carbonate
substrate according
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.)
Withdrawn
Application number
EP08737606A
Other languages
German (de)
English (en)
Other versions
EP2109697A4 (fr
Inventor
Olli Hakkila
Paul-Heinz Daehling
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.)
Stora Enso Oyj
Original Assignee
Stora Enso Oyj
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
Priority claimed from FI20070100A external-priority patent/FI122186B/sv
Application filed by Stora Enso Oyj filed Critical Stora Enso Oyj
Publication of EP2109697A2 publication Critical patent/EP2109697A2/fr
Publication of EP2109697A4 publication Critical patent/EP2109697A4/fr
Withdrawn legal-status Critical Current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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • 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
    • 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
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention relates to a wood fiber containing printing substrate. It additionally relates to a printing method comprising said printing substrate.
  • An offset printing unit comprises a plate cylinder, ink and dampening rollers, a blanket cylinder and an impression cylinder.
  • the printing plate comprises hydrophilic, water receptive parts and hydrophobic, ink receptive parts.
  • the water receptive parts of the plate form non-image areas whereas the ink receptive parts form image areas.
  • the dampening rollers apply chemically modified water, so called fountain solution, to the non-image areas of the plate whereafter ink is applied to the image areas of the plate.
  • the ink and the fountain solution are transferred to the printing substrate from the printing plate via a rotating blanket cylinder which is covered with a smooth offset blanket.
  • the substrate is continuously printed in one or more printing units and subsequently dried in a hot air dryer in order to dry the ink printed on the surface. Finally, the ink is hardened on chilling rolls. Both sides of the moving web are printed simultaneously in a printing nip formed by the blanket cylinders of an upper and a bottom printing unit. In conventional 4-color printing, eight printing units are needed, four on both sides of the web. Ink from all printing units is transferred onto the substrate before the drying. This means that ink from the first printing unit is printed on a dry paper surface and that ink from the last printing unit is transferred on a substrate that has been wetted with the fountain solution by the preceding printing units.
  • the printing ink mainly consists of colorant pigment, binder to fasten the pigment on the substrate surface and solvent to provide appropriate flow properties.
  • solvent In the dryer, most of the ink solvent is evaporated quickly in hot air.
  • the ink film on the substrate surface gets its' final hardness in the cooling stage on the chilling rolls. Thereafter, the printed web usually enters a folding unit, where it is folded and cut into printed signatures.
  • Fountain solution is needed to separate the image area and the non-image area on the offset printing plate.
  • the fountain solution may cause several problems after the ink is transferred onto the printing substrate.
  • Fountain solution transferred to a coated printing substrate may decrease the strength of the coating layer.
  • the substrate is wetted in the first printing unit.
  • the ink is transferred on an already wetted substrate surface.
  • tacky ink is transferred on a coating layer with decreased strength, picking of loosened coating particles might occur. These particles have a tendency to accumulate on the printing blanket in a cumulative way causing a need to clean the blankets.
  • the printing substrate e.g. a printing paper
  • the printing substrate has to be highly porous and hydrophilic in order to absorb the fountain solution transferred to the substrate.
  • the penetration of fountain solution into a porous, fibrous material may cause swelling of wood containing fibers.
  • the swelling of fibers causes an increase in the paper dimensions so that an image printed in the first pair of printing units does not perfectly match the image printed in the fourth pair of printing units. This is especially a problem at the edges of wide webs. This so called register or fan-out problem is seen as blurred color images on the printed surface. Dot doubling which cause unwanted tones in a printed image may also result from dimensional changes in the substrate between the printing units.
  • porous, water absorbing printing substrates need to be dried at high temperatures.
  • the web temperature can exceed 100 0 C after 0,2 s in the dryer and web exit temperatures can reach 150°C. Drying at such high temperatures causes fiber roughening, fluting and blistering. This is especially a problem in the printing of paper comprising mechanical fibers.
  • One reason for the occurrence of fiber rising is the fast moisture evaporation from the base sheet of a porous, coated printing substrate as vapor pressure opens fiber bonds. Fluting is the permanent formation of wave patterns in the print. The mechanism of fluting is not thoroughly understood, but it is a result of uneven moisture escape from the substrate due to high temperature drying. Blistering due to high temperature drying can sometimes be so severe that the base sheet delaminates. Blister bubbles can also lead to web breaks in the printing.
  • the heatset web-offset printing method of today is also very energy consuming.
  • the air temperatures in the dryer can typically reach 250 0 C.
  • WO2004030917 relates to a coated printing substrate with an oleophilic surface, which substrate has a Gurley-Hill permeance value bigger than 5000s/100ml, and an IGT ink set-off value bigger than 0, 6 print density units at 30s delay time.
  • oleophilic surface it is meant that the surface repels the fountain solution, whereby it is apparent that the contact angle with water of the surface is more than 90 ° .
  • vapor originating from moisture in the base paper can not evaporate readily from a closed, non-porous substrate, such as the one described in WO2004030917. This gives rise to an enhanced vapor pressure inside the substrate causing severe print quality problems like fiber rising and blistering. These problems may take place even if the web exit temperature from the dryer is under 115 0 C as mentioned in WO2004003293, since the maximum web temperature is normally not in the web exit but somewhere inside the dryer.
  • oleophilic surfaces such as the one described in WO2004030917, also tends to be quite hydrophobic. If the non-porous surface is too hydrophobic the continuous flow of fountain solution from the printing plate via the blanket to the paper is disturbed. Fountain water concentrates in the printing unit which can be seen as print defects in certain image areas. On the other hand, if the surface is too hydrophilic, the forces between the substrate and the water are higher than the forces between the substrate and the oil. Consequently, water on the surface of the substrate repels ink which can result in lower color strength and uneven print.
  • the substrate disclosed in WO2004003293 is coated with plate like pigments, such as kaolin and talc.
  • Kaolin and talc are relatively expensive pigments compared to for example calcium carbonate.
  • plate like pigments, such as kaolin and talc gives rise to printing papers with a lower brightness compared to, e.g., calcium carbonate.
  • One object of the present invention is to provide a printing substrate that do not involve the problems of the prior art.
  • a further object of the present invention is to provide a printing substrate for heatset web-offset printing, which has excellent dimension stability and allows a low energy drying.
  • Yet another object of the present invention is to provide a printing substrate for heatset web-offset printing which gives rise to low fluting and low fiber roughening and improved cracking resistance.
  • Yet another object of the invention is to provide a printing substrate with an improved print quality and runnability.
  • the above-mentioned objects, as well as other advantages, is attained by providing a printing substrate according to claim 1.
  • the printing substrate can, e.g., be a fiber containing substrate, preferably a cellulose fiber containing substrate such as paper or paperboard.
  • the printing substrate of the invention exhibits a Cobb(wl5) water absorption value below 15 g/m 2 , preferably below 12 g/m 2 , a Cobb(o,C10) oil absorption value below 1.2 g/m 2 , preferably below 1 g/m 2 , and an Ink setting below 0.5, preferably below 0.3.
  • the Cobb (wl5) water absorption value within the range of 1 - 15 g/m 2 , most preferably within the range of 2 - 15 g/m 2
  • the Cobb (o,C10) is within the range of 0.2 - 1.2 g/m2, most preferably within the range of 0.3 - 1 g/m 2 .
  • the low water and oil absorption in combination with the quite fast ink setting of the substrate according to the invention gives rise to a printed substrate with improved printing qualities.
  • the substrate of the invention exhibits low water absorption but, nevertheless, it allows vapor to penetrate through the structure, whereby problem like blistering is avoided.
  • the fountain solution transferred onto the substrate is prevented from penetrating into the substrate structure due to the low water absorption. In this way, no harmful changes in substrate dimensions due to fiber swelling take place and misregister and dot doubling can be avoided.
  • Good dimension stability also allows the use of wide webs in printing with sharp pictures (good register) and good tone reproduction, which affects the development of wider heatset web offset presses.
  • the printing substrate further exhibits a contact angle with water below 90°.
  • water from the printing blanket is transferred to the hydrophilic printing substrate whereby a continuous flow of fountain solution from the printing unit onto the paper is enabled.
  • the contact angle with water is below 90° but above 60°. This prevents the substrate from being too hydrophilic. Thereby, problems with low color strength and uneven print are avoided.
  • the printing substrate is a fiber containing substrate, such as paper or paperboard, coated with a coating composition, which composition comprises a pigment composition.
  • the pigment composition comprises calcium carbonate.
  • the use of calcium carbonate as a pigment is economical beneficial since calcium carbonate is a relatively inexpensive coating pigment.
  • calcium carbonate has a potential to improve paper brightness.
  • the pigment composition comprises calcium carbonate to an amount of more than 10 %, most preferably to an amount of more than 20% of the pigment composition. This enhances the optical properties of the substrate even further.
  • the pigment composition comprises fine particulate talc with a spherical diameter of micrometer size, calcium carbonate particles of nanometer size and a binder comprising a copolymer including as monomer at least one dicarbon acid and at least one monomer chosen from the group of diamine, triamine dialcanolamine or trialcanolamine.
  • This specific pigment composition makes it possible to control the water absorption properties and the porosity of the paper, since the separation of the calcium carbonate particles from the talc particles is avoided.
  • the minor water and solvent that is absorbed by the substrate according to the invention is trapped by the nano size pigments in the structure of the coating layer and prevented from migrating into the base sheet of the substrate .
  • the pigment composition comprises talc and calcium carbonate in a ratio within the range of about 3:1 to about 1:3, most preferably in a ratio of 2:1.
  • the talcum content improves the water repellency of the surface and keeps the ink setting on an appropriate level.
  • the substrate of the invention gives rise to good dry and wet strength which, in combination with the low water absorption of the substrate, further prevents the tendency of piling of coated material on the offset blanket. This allows the use of a substrate with fast ink setting and an easily drying low tack ink, which makes it possible to dry the printed substrate at low temperatures. Thereby, problems related to high temperature drying, such as fiber rising and waviness, are minimized.
  • the specific surface properties of the inventive substrate allow the use of an easily drying ink, e.g., like the one disclosed in EP 1602696 A 1. This makes it possible to dry the print at temperatures chosen so that the maximum web temperature obtained in the drying is kept below 130 °C, preferably below 100 0 C.
  • the drying of the printed substrate of the invention at such low temperatures results in a printed substrate with a higher moisture content.
  • a printed substrate with high moisture content has better resistance against cracking when folded in a finishing stage and does not exhibit static electricity problems in handling of printed signatures. Cracking resistance is especially needed in wire-stitching stage in magazine finishing line as wire stables are pushed through the fold of printed signatures from different print runs and then closed underside.
  • the invention further relates to a printed substrate comprising said printing substrate and heatset offset ink printed on the substrate and to a web heatset offset printing method comprising the steps of printing said printing substrate in at least one web heatset offset printing unit and drying said substrate in at least one drying unit.
  • the drying is performed at a temperature chosen so that the maximum web temperature obtained in the drying is below 130 0 C, preferably below 100 0C.
  • the printing substrate of the invention is most suitable for heatset offset printing, but can for example also advantageously be printed in the sheet fed offset and gravure printing methods.
  • the advantageous of the printing substrate is primary associated with heat set web offset printing, it is understood that the low water absorption of the printed substrate in sheet fed offset printing also gives rise to a good dimension stability and water proof properties that are especially advantageous for products like maps or food packaging materials.
  • the use of the printing substrate in gravure printing allows the use of water based inks since the low water absorption generates the good dimension stability needed in wide webs.
  • a printing substrate with low water absorption is achieved by providing a base paper and a coating formulation designed to provide low Cobb water and Cobb oil values and a fast ink setting.
  • such a substrate is achieved by providing a base paper with a coating composition comprising a pigment composition, which pigment composition includes inorganic or organic microparticles, inorganic nanoparticles and a binder.
  • the binder in the pigment composition is a copolymer comprising as a monomer at least one dicarbonacid and at least one monomer from the group consisting of diamine, triamine, dialkanolamine or trialkanolamine.
  • microparticles mean that the particles' spherical diameter is of micrometer size, i.e. within the range of 0.3 - 100 ⁇ m, most preferably between 1 - 25 ⁇ m.
  • the microparticles are particulate talc, most preferably plate-like talc, since talc improves the water repellency of the surface and keep the ink setting at appropriate levels.
  • the particles' spherical diameter is of nanometer size, i.e. less than 200 nm.
  • the nanoparticles are particulate calcium carbonate.
  • Calcium carbonate is an inexpensive pigment and gives rise to good optical properties.
  • the calcium carbonate can be precipitated calcium carbonate (PCC) or ground calcium carbonate (GCC) .
  • the nano calcium carbonate is ground calcium carbonate (GCC) that is grinded in the presence of a hydrophobation agent, e.g ethylene- acrylic acid copolymer (EAA) .
  • GCC ground calcium carbonate
  • EAA ethylene- acrylic acid copolymer
  • the hydrophobation agent reduces the water absorption of the nano calcium carbonate, and thus reduces the water absorption of the printing substrate even further.
  • Other pigments, such as calcined clay, TiO2 and plastic pigments could alternatively or additionally be used in the pigment composition.
  • the pigment binder that prevents the separation between the nanoparticles and the microparticles may, for e.g. be a copolymer from adipic acid with N-2-aminoethyl) -1, 2- ethandiamin and epichlorhydrin.
  • the binder is preferably present in the pigment composition at an amount of about 2% of the total amount as calculated on the microparticles.
  • the coating composition may further comprise one or more binder to bind the pigment composition to the surface of the substrate.
  • This binder may be natural or synthetic and may include, but are not limited to, starch, protein and latex.
  • additives such as lubricants, may also be added to the composition.
  • the base paper can be any kind of base paper.
  • the coating composition may be applied at one or both sides of the base paper at a wide range of coat weights, e.g. in an amount of 5-40 gsm per side, preferably in an amount of 10 - 20 gsm per side.
  • the coating can be applied on the base paper using any kind of coating technique, e.g. a size press, by roll or jet application, by jet coating, by blade coating or by curtain coating.
  • the base paper can be multilayer coated, e.g. double coated, whereby one of the coating layers is the coating composition described herein and the other is a conventional coating composition.
  • the printing paper of the invention i.e.
  • the base paper coated with the coating composition that is designed to provide low Cobb values and a fast ink setting can be further coated with an additional, conventional, coating composition.
  • the base paper can first be coated with a conventional coating composition whereupon the coating composition designed to provide the low Cobb values and fast ink setting forms a top layer on top of the first, conventional coating.
  • the coated paper may be calendered, e.g. in a supercalender.
  • Ink setting is determined in accordance with Pr ⁇ fung von Druckpapieren, Merkblatt V/32/99.
  • the ink set-off is a measure of the speed of ink setting on the substrate.
  • the printed substrate is brought in temporary contact with a counter printing paper in a printing unit under defined line pressure and at fixed time intervals. Thereafter, the coloring resulting from the ink transfer to the counter paper is measured with an optical densitometer.
  • the measurement is performed according to Zellcheming standard V/31793 with an amount of ink on the paper surface of 1,5 g/m 2 .
  • the ink used is Wegschlagtester Michael Huber M ⁇ nchen 520068 06.09.06, 0.100.
  • the counter paper used is Scheufelen APCO II/II. Air conditioning is according to ISO 187 (23°C/50%RH) .
  • the test direction is the print direction, parallel to the machine direction.
  • the time intervals are: 15s; 30 s; 60s; 120s; 300s.
  • the ink setting value is given at 60s time.
  • the printing machine used is Pr ⁇ fbau Probeandruckgerat . In the printing of the substrate, endless vulcanized rubber with 65"shore hardness is used as printing form. In the printing of the counter paper a printing form in aluminum is used.
  • the pressure substrate/counterform is 200 N/cm.
  • Porosity is measured using a micromeritics automatic porosimeter, Auto Pore III 9405.
  • the evaluation range is 0,01 - 0,001 ⁇ m, and the measurement is conducted according to the pressure intervals shown in appendix I.
  • the mercury Porosimetry method the porosity is characterized by applying various levels of pressure to a sample immersed in mercury. As pressure increases during an analysis, pore size is calculated for each pressure point, and the corresponding volume of mercury required to fill these pores is measured.
  • Contact angle is measured using SCAN P 18:66.
  • the shape of a water droplet over the substrate surface is measured. If the substrate repels water, the drop will become ball shaped. If the water wet the substrate, the drop will be more planar.
  • the water repelling or water loving properties can be found out by measuring the angle whose other leg is the base of the drop on substrate surface and the other leg is the tangent of the drop in the immediate nearness of the surface. In the example shown below, the angle is measured after 0.1 s and the conditioning atmosphere is according to ISO 187 (23°/50%RH) .
  • K&N ink absorbency is measured in accordance with SCAN-P 70:95 using a special ink provided by K&N to evaluate the absorption of ink by the substrate surface.
  • the K&N ink absorbency is measured by the percentage surface brightness drop when K&N ink is applied for 2 minutes and thereafter removed. The smaller the number for ink absorbency, the more nonporous the coating is and, consequently, a lesser degree of ink penetrates into the coating.
  • Fluting is measured in with a Lehmannprofilometer, AS300. This instrument works with a laser to record the wave contour on the printed surface. The fluting index is calculated via the square of the slope each wave, averaging several waves in different printed areas. The lower the fluting index is, the lower is the fluting.
  • Printing ink tack is measured with a Tack-O-Scope device in accordance with ISO 12634.
  • the test condition is as follows: ink amount 0.4 ml, stabilizing time 30 s, stabilizing speed 50 m/min, testing speed 150 m/min, temperature 30 °C.
  • Maximum ink tack and time for the maximum ink tack were taken from the tack curve to describe drying characteristics of the ink. The shorter the time for maximum tack is, the faster is the ink drying propensity.
  • the tack value characterizes the force needed to split an ink film in ink transfer between the substrate and the printing blanket.
  • a lower tack value means a lower splitting force and lower strength demand on the paper.
  • Passes to fail is measured with a Prufba ⁇ Deltack instrument.
  • ink is transferred onto a paper substrate whereupon the formed ink layer is split every third second.
  • the printing ink tack increases during the test as ink sets on the paper. The operator will visually notice how many times the ink splitting can take place before the paper surface breaks. The number of ink splitting times is called Passes to Fail. The higher the number is, the better is the surface strength of the printing substrate.
  • the ink used in this test is Huber Wegschlagtest contained ink 520068.
  • the preset printing impression (unit A) is 800 N
  • the printing speed is 0.5 m/
  • the temperature 18 0C the ink amount 190 ⁇ L.
  • Picking is defined as pulling off individual particles from the paper surface i.e. tearing off the paper or board surface during the printing process.
  • the dry pick is measured with a Multipurpose Printability Tester produced by Pr ⁇ fbau, Kunststoff with the following settings :
  • the paper is printed at an accelerated speed with a Pr ⁇ fbau Probeantik instrument.
  • the ink splitting force increases as ink transfer speed on paper increases.
  • ink splitting force exceeds the paper surface strength which can be seen as pulling off individual particles from the paper.
  • the speed at which the picking starts is given in units m/s. The higher the paper surface strength the higher is the speed where picking starts.
  • Nr. 2 (408002) normal setting *(Inko 14.8) Nr. 3 (408003) high tack values *(Inko 19.5)
  • the wet picking is measured with a Multipurpose printability tester with wetting unit delivered by Pr ⁇ fbau, Kunststoff with the following settings:
  • the paper is first wetted. After 1 s, the wetted paper is printed at constant speed with a Pr ⁇ fbau Probeantik instrument. At a certain ink transfer speed, the ink splitting force exceeds the paper surface' s wet strength, which can be seen as pulling off coating layer particles from the print. In this test the speed at which the wet picking first is notices is given in units m/s. The higher the paper surface wet strength is, the higher the speed where picking occurs is. In the example below, the following testing inks from Michael Huber, Kunststoff, are used:
  • Nr. 2 (408002) normal tack values *(Inko 14.8) Nr. 3 (408003) high tack values *(Inko 19.5)
  • the base paper used in the example below was a NeoPress G uncoated base paper, 36 gsm, comprising 50% of northern bleached softwood kraft (NBSK) pulp and 50% of mechanical pulp.
  • NBSK northern bleached softwood kraft
  • the talc particles used in the pigment compositions have spherical diameters in the micrometer size, the ground calcium carbonate particles have spherical diameters in the nanometer size.
  • the pigment compositions further comprises a copolymer of adipic acid with N- (2-aminoethyl) -1, 2- ethandiamine and epichlorhydrin as a binder.
  • the pigment compositions were prepared according example Ia and Ib below.
  • the examples show the preparation of Pl and P3.
  • the pigment composition P2 was prepared in the same way as P3, but with different ratios of calcium carbonate and talc. In the preparation of P2, the additional additives and reaction components were recalculated to the same proportions as in the preparation of P3.
  • the particulate talc used in the example Ia is Finntalc P 05 Pulver, MONDO Minerals, Finland.
  • the Binder is a 15 % aqueous solution of a copolymer of adipic acid with N-2-aminoethyl) -1, 2-ethandiamin and epochlorhydrin with the following characteristics:
  • Said binder may for example be produced by producing an intermediate product (1) by the reaction between diethylentriamine, monoethanolamine and adipic acid in distillated water.
  • the resulting intermediate product (1) is reacted with epicholorhydrin using sulfphuric acid and calciumsorbat as catalysator. Thereafter, the solid content is adjusted to 12-20 w% by the addition of water and the pH is adjusted to pH 3 by the addition of sulphuric acid.
  • Nano particulate calcium carbonate 1 is a mixture of nano particulate calcium carbonate 1:
  • the nano particulate calcium carbonate is produced by continuously grinding Norwegien Marmor particles of an equivalent diameter of 45 ⁇ m.
  • the grinding is performed in the presence of 0.85 w% sodium/magnesium-polyacrylat, calculated on the total dry weight of the composite, with a MW of 6000 g/mol, as grinding additive, and 1 w% polyethylene-polyacrylacid-copolymer-sodium salt, calculated on the total dry weight of the composite.
  • the nano-calcium carbonate is grinded to a dry content of 72 w% with the particle size as shown in table 2
  • the resulting composite has a Brookfield viscosity (after 5 days) of 108/109/112 mPa*s, a pH of 8.86 and a solid content of 64.76 w% .
  • the nano particulate calcium carbonate is not segregated from the micro particulate talc.
  • the particulate talc used in the example is Finntalc P 05 Pulver, MONDO Minerals, Finland.
  • the Binder is a 15 % aqueous solution of a copolymer of adipic acid with N-2-aminoethyl) -1, 2-ethandiamin and epichlorhydrin described in example Ia.
  • Nano particulate calcium carbonate 2 :
  • the nano particulate calcium carbonate is produced by continuously grinding Norwegien Marmor particles of an equivalent diameter of 45 ⁇ m. The grinding is performed in the presence of 0.85 w% sodium/magnesium-polyacrylat, calculated on the total dry weight of the composite, with a MW of 6000 g/mol, as grinding additive, calculated on the total dry weight of the composite.
  • the nano-calcium carbonate is grinded to a dry content of 72 w% with the particle size as shown in table 3:
  • the nano particulate calcium carbonate is not segregated from the micro particulate talc.
  • the coating compositions were prepared as presented in table 4 below.
  • the thereby produced printing substrates were printed in a heatset web offset printing press.
  • the printing press used was a Albert-Frankenthal A 101 S heatset web-offset press with four blanket-to-blanket printing units and a four module 8 m long MEG Sigma hot air dryer.
  • the fountain water used in the printing consisted of 3 % Huber Hit Redufix-R and 5 % IPA with a temperature of 10 0 C, a conductivity of 740 ⁇ S/cm and a pH of 5,6.
  • the printing blankets were Day Durazone 5000.
  • the printing ink used was Huber Group 25 H series ink with the following properties measured with a Tack-O-Scope and in comparison is another commercial ink (legend ink A is 29 H 3800 Rollo- Therm series by Huber Group) .
  • legend ink A is 29 H 3800 Rollo- Therm series by Huber Group
  • the ink used in the printing is a very fast drying type with short time to maximum tack and the ink tack is low.
  • Substrate properties i.e. ink setting, Cobb (wl ⁇ ) , Cobb (o,C10), contact angle with water, surface pore size and K&N absorbency, were measured for all the substrates Sl, S2, S3 in accordance with the measuring and evaluation methods described above.
  • the same measurements were performed on a reference substrate, NovaPress (Rl), 70 gsm, which is a commercially available MWC offset paper, produced by Stora Enso Publication Paper, Veitsiluoto mill.
  • the NovaPress is coated with a coating composition comprising calcium carbonate and clay and is calendered on a Supercalender with 12 rolls in stack.
  • the contact angle was determined to 86,1° after 0,1 s for
  • the print quality was evaluated by measuring the fluting for the printing substrates Sl, S3 and Rl according to the method described above and by visual characterization. For the paper substrates Sl, S2 and S3, also the wet and dry pick was determined. For the paper substrates S2 and Rl, the passes to fail were determined in accordance with the method described above. The results from the fluting, picking and passes to fail measurements are shown in table 6.
  • the fluting tendency was much lower for the paper according to the invention compared to the prior art reference.
  • the paper according to the invention further showed a high dry and wet picking resistance and a better surface strength (passes to fail) , which in combination with the low water absorption allows the use of a fast setting ink.
  • the printed surface of Sl, S2 and S3 was much smoother and less roughened as compared to Rl . While specific embodiments and examples of the products and methods of the invention have been shown and described, it will be appreciated by those skilled in the art that changes and modifications may be made thereto without departing from the invention in its broader aspects and as set forth in the following claims.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Printing Methods (AREA)

Abstract

L'invention concerne un substrat d'impression pour l'héliogravure et l'impression offset, ledit substrat présentant une valeur d'absorption d'eau Cobb (w15) inférieure à 15 g/m2, de préférence inférieure à 12 g/m2, une valeur d'absorption d'huile Cobb (o,C10) inférieure à 1,2 g/m2, de préférence inférieure à 1 g/m2, et un réglage de la prise d'encre inférieur à 0,5, de préférence inférieur à 0,3. Les faibles absorptions d'eau et d'huile en combinaison avec le réglage de la prise d'encre assez rapide du substrat selon l'invention donnent lieu à un substrat imprimé ayant des qualités d'impression améliorées.
EP08737606A 2007-02-05 2008-02-04 Substrat d'impression Withdrawn EP2109697A4 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US89944807P 2007-02-05 2007-02-05
FI20070100A FI122186B (sv) 2007-02-05 2007-02-05 Trycksubstrat
FI20070635A FI20070635A0 (fi) 2007-02-05 2007-08-22 Painosubstraatti
PCT/IB2008/001142 WO2008096274A2 (fr) 2007-02-05 2008-02-04 Substrat d'impression

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EP2109697A2 true EP2109697A2 (fr) 2009-10-21
EP2109697A4 EP2109697A4 (fr) 2012-08-29

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CN102602180A (zh) * 2012-03-19 2012-07-25 郭安民 中国传统水墨凹版印刷工艺
FI128492B (en) 2015-04-28 2020-06-15 Fp Pigments Oy Aqueous dispersions of precipitated calcium carbonate

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WO2007141260A1 (fr) * 2006-06-09 2007-12-13 Omya Development Ag Composites de microparticules inorganiques et/ou organiques et de nanoparticules de carbonate de calcium

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ES2063773T3 (es) * 1988-03-07 1995-01-16 Pluss Stauffer Ag Mezcla de pigmentos para la industria papelera.
GB9522228D0 (en) * 1995-10-31 1996-01-03 Ecc Int Ltd Pigments for paper coating compositions
AU706130B2 (en) * 1996-03-04 1999-06-10 Fp-Pigments Oy Pigment particles coated with precipitated calcium carbonate and a process for the preparation thereof
US6641875B2 (en) * 2001-08-31 2003-11-04 Eastman Kodak Company Ink jet recording element
FI20020521A0 (fi) * 2002-03-19 2002-03-19 Raisio Chem Oy Paperin pintakäsittelykoostumus ja sen käyttö
AR061138A1 (es) * 2006-06-09 2008-08-06 Omya Development Ag Compuestos de microparticulas inorganicas y/u organicas y nanoparticulas de dolomita

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WO2007141260A1 (fr) * 2006-06-09 2007-12-13 Omya Development Ag Composites de microparticules inorganiques et/ou organiques et de nanoparticules de carbonate de calcium

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Title
See also references of WO2008096274A2 *

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FI20070635A0 (fi) 2007-08-22
WO2008096274A3 (fr) 2008-11-27
EP2109697A4 (fr) 2012-08-29
WO2008096274A2 (fr) 2008-08-14
WO2008096274A8 (fr) 2009-12-03
CN101680188A (zh) 2010-03-24

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