• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    There is provided a method of producing a coated paper or board for flexographic printing, characterized by the step of providing the paper or board with a pigment line comprising at least one porous layer.
    公开号:AT511562A2
    申请号:T461/2012
    申请日:2012-04-17
    公开日:2012-12-15
    发明作者:Jouni Haavisto；Henri Vaittinen；Pekka Linnonmaa
    申请人:Metso Paper Inc；
    IPC主号:
    专利说明:

    * * • · III »·
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    The invention relates to a method for producing a coated paper or board for flexographic printing.
    Ceiling paper (" linerboard ") is used as a liner for corrugated board. The typical reamed area for ceiling paper is 125 to 350 g / m2, although reamweights below 100 g / m2 are also suitable for small packages.
    There are different classes of ceiling paper in the market. Ceiling paper is almost always a two-ply product consisting of an upper layer and a base layer. Ceiling paper is made with different top layers and from different raw materials. Both primary fibers (typically softwood pulp, in some cases hardwood or sawdust pulp) and recycled fibers are used for the production of ceiling paper. Ceiling paper, which is mainly made from virgin fiber, is commonly called " Kraftliner " whereas blanket paper containing recycled fibers, " Testliner " is called. However, in recent years, almost all new cover papers have been based on recycled fibers. In North America, old corrugated board (OCC) packaging is recycled fiber; Mixed waste is also used in Central Europe and Asia. If a sulphate pulp of virgin softwood kraft pulp is used, the pulp for a base layer is first cooked and then slightly refined. The upper layer pulp is cooked with a higher kappa number and will also be more refined than the base layer pulp layer. Ceiling paper is resin-coated for moisture resistance. If a recycled fiber of low quality is used as raw material, is a
    Size presses for surface sizing necessary to achieve satisfactory strength properties.
    White top linerboard / cardstock is used for requesting printing tasks; Therefore, smoothness and appearance of the surface are very important. Usually, bleached chemical pulp is used in the top layer. If excellent training is to be achieved, hardwood pulp should be the major component of the top layer. A filler material is often used in the top layer to improve the opacity and thus the appearance of the top side. Here, the training of the upper layer should be as good as possible for a good visual appearance. Conventionally, a base layer (or underside layer) of a white-faced ceiling paper is mainly composed of unbleached softwood pulp. However, the base layer today can also consist of recycled fibers. This product is also called white top testliner.
    Coated ceiling paper or coated white-coated board ("coated white top linerboard") is the most demanding product in the liner family. The top layer is made of bleached pulp and its ream weight is the same as blank paper / board with a white surface. The paper / board can be painted either inside or outside the machine. A typical swipe is a single stroke with a knife coater. Coated ceiling paper or coated board with white surface is used for challenging applications of corrugated board, for example, for containers displayed in shop windows. Testliners with a white surface based on recycled fibers can also be painted.
    Flexographic printing is the main printing process for ceiling papers or cardboards. The printing plate used is an elastic plate made of rubber or photopolymer, which carries the printed image in relief. For details on the flexographic printing process as well as the structure of printing devices employed therefor, reference is made, for example, to the book " Flexography: Principles & Practices, 5th Edition (1999) of the Foundation of Flexographic Technical Association.
    In flexographic printing, uncoated blanket paper does not require external drying because the uncoated surface is an absorbent substrate. Fast ink absorption is one of the most important factors influencing flexographic printability if there is no drying between the printing units. Exposure and smearing of the flexographic ink may occur if ink absorption is not fast and not high enough. In general, painting coverslips with standard pigments, such as GCC or clay, reduces ink absorption of the surface. Coated cover layers are therefore usually not printed with flexographic printing devices without drying units (as with uncoated cover layers), because for the coated surface ink volumes are too high and a drying time is too short. Also, corresponding so-called postprint processes for coated cover layers are usually unsuitable.
    Further, when an uncoated product is to be replaced with a coated product (i.e., used in conjunction with processes intended for uncoated products
    ·· ** 4), the desired dull surface also presents its own requirements. Typically, the coated products are painted at the end of the printing process to protect the dull surface from mechanical, abrasive, and thus even straightening forces.
    The object of the invention is to provide a method for producing a coated paper or cardboard, which / is particularly suitable for flexographic printing.
    This object is achieved by the method according to the following points: 1. A method for producing a coated paper or board for flexographic printing, characterized by the step of providing the paper or cardboard with a pigment coating comprising at least one porous layer. 2. Method according to item 1, characterized in that an average pore size of the pores of the at least one porous layer is 1 to 400 nm. 3. The method according to item 2, characterized in that the average pore size is 1 to 100 nm, preferably 1 to 70 nm, in particular 20 to 70 nm. 4. The method according to any one of items 1 to 3, characterized in that the pigments have an inner porosity in the nanometer range. 5. The method according to any one of items 1 to 4, characterized in that the pigments used a • · * · · · · · · 4 ft ··· ··· ·
    Average size in the nanometer range and are present in a narrow size distribution. 6. The method according to item 5, characterized in that the pigments used have an average size of 10-1000 nm, preferably from 10-50 nm and in particular from 20-30 nm. 7. The method according to any one of items 4 to 6, characterized in that the pigments contain calcium carbonate, gypsum and / or silicate-based pigments. 8. The method according to any one of items 1 to 7, characterized in that the at least one porous layer forms the outermost layer of the paper or cardboard. 9. The method according to any one of items 1 to 8, characterized in that the cardboard is a white top liner. 10. The method according to any one of items 1 to 9, characterized in that the basis weight of the pigment coating is 0.5 to 20 g / m2. 11. The method according to any one of items 1 to 10, characterized in that the pigment coating is applied by curtain coating. 12. The method according to any one of items 1 to 11, characterized by the step of calendering the paper or cardboard after applying the pigment coating. 13. The method according to item 12, characterized in that the surface roughness of a calendering roll used is 0.5 to 10 Ra.
    14. The method according to item 13, characterized in that the surface roughness is 0.5 to 3 Ra. 15. The method according to item 13 or 14, characterized in that the surface of the calender roll is coated with carbide or a ceramic mixture. 16. The method according to any one of items 1 to 15, characterized in that the flexographic printing is carried out without separate drying. 17. The method according to any one of items 1 to 16, characterized in that an amount of water that uses a printing unit for flexographic printing, at least lg / qm water. 18. The method according to any one of items 1 to 17, characterized in that a printing time delay between printing units for flexographic printing is a maximum of 200 ms.
    By the solution according to point 1 (and also point 2), i. Providing the porous layer, a surface structure of the produced paper or cardboard is ensured, which can absorb large amounts of water very quickly. In particular, the very rapid absorption capability ensures that the coated board (or the paper) produced according to the invention is suitable for flexographic printing (flexographic printing).
    The increase in the absorption rate is ensured in particular by the developments according to points 3 to 7. • * ΙΊ]
    By these developments, in particular, the hydrophilicity of the surface is improved, whereby an acceleration of the absorption is achieved especially at the beginning. Namely, the formed pores lead to a capillary effect, i. they create a capillary force, whereby water applied to the surface of the paper / board is released. Color) is sucked into the interior of the paper / cardboard. The finer the pores (smaller pore size) and the more pores (higher pore density or narrow size distribution) are formed on the surface, the stronger this effect.
    The coated board (or the paper) produced according to points 1 to 15 is particularly suitable for flexographic printing with a flexographic printing machine because of its high absorption capacity, in which no additional drying devices are provided (item 16) and / or high amounts of water occur (item 17). and / or a period of time between printing operations in two adjacent printing units (printing units) is very low (item 18). The coated board produced according to the invention (or the paper) is suitable for use in all conventional flexographic printing machines, for example, in row construction, satellite or central design or Mehrzylinderkompaktbauweise. These may have different numbers of printing units (printing units), wherein preferably the number of printing inks used is 1 to 7. Examples of flexographic printing machines used can be found in the initially mentioned book "Flexography: Principles & Practices ".
    Although the product produced may be calendered or uncalendered, calendering according to items 12 to 15 is advantageous. In this case, the calendering roll according to items 13 to 15 in any calender type, e.g. in one
    Hartnip-, soft-, shoe or Metallbandkalander be installed. The desired surface roughness of the calendering roll may be produced by coating the calendering roll with a material of particles of suitable size, as described, for example, in Item 15. Alternatively, the desired surface roughness of the roll can be achieved by directly corroding the roll surface. A calender roll having a surface roughness of 0.5 to 10 Ra forms a so-called " matte calender " which achieves a desired mattness of the paper / board.
    The produced paperboard, which is advantageously a ceiling board, preferably consists of a base material and a surface layer provided thereon. The base material of cardboard forms a kind of supporting layer or layer, which is preferably made of recycled pulp (such as, for example, from OCC or DIP = deinked pulp). It is also possible to use a white factory pulp as the base material.
    The surface layer for forming the porous surface (pigment coat) may be formed by a doctor blade coating method. Advantageously, a pre-coating is produced by this method, to which then the porous surface layer by way of
    Curtain coating is applied. The generation of the surface layer can also by way of
    Film transfer method or by spraying can be achieved. Preferably, the surface layer should not leave the range of 0.5 to 20 g / m 2.
    In the following, a few possibilities of the composition of the at least one porous layer will be briefly explained
    described. Namely, the at least one porous layer may have, for example, the following pigments:
    Large pigments with nanometer-scale internal porosity (such as silica), nanometer-scale pigments, and "standard pigments"; Large pigments with nanometer-scale porosity (such as silica) and "standard pigments"; - Nanometer-sized pigments and "standard pigments", or - Large pigments with nanometer-scale intrinsic porosity (such as silica) and nanometer-sized pigments.
    For example, the appended figure shows schematically the structure of a porous layer of silicon dioxide, which are large pigments and in this example have an average size of about 10 pm, and pigments in the nanometer range (here: PCC = precipitated calcium carbonate).
    权利要求:
    Claims (18)
    [1]
    Claims 1. A method for producing a coated paper or board for flexographic printing, characterized by the step of providing the paper or board with a pigment line comprising at least one porous layer.
    [2]
    2. The method according to claim 1, characterized in that an average pore size of the pores of the at least one porous layer is 1 to 400 nm.
    [3]
    3. The method according to claim 2, characterized in that the average pore size is 1 to 100 nm, preferably 1 to 70 nm, in particular 20 to 70 nm.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the pigments have an inner porosity in the nanometer range.
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the pigments used have an average size in the nanometer range and are present in a narrow size distribution.
    [6]
    6. The method according to claim 5, characterized in that the pigments used have an average size of 10-1000 nm, preferably from 10-50 nm and in particular from 20-30 nm.
    [7]
    7. The method according to any one of claims 4 to 6, characterized in that the pigments contain calcium carbonate, gypsum and / or silicate-based pigments.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the at least one porous layer forms the outermost layer of the paper or cardboard.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the cardboard is a white top liner.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the basis weight of the pigment coating is 0.5 to 20 g / m2.
    [11]
    11. The method according to any one of claims 1 to 10, characterized in that the pigment coating is applied by curtain coating.
    [12]
    12. The method according to any one of claims 1 to 11, characterized by the step of calendering the paper or cardboard after the application of the pigment coating.
    [13]
    13. The method according to claim 12, characterized in that the surface roughness of a calendering roll used is 0.5 to 10 Ra.
    [14]
    14. The method according to claim 13, characterized in that the surface roughness is 0.5 to 3.
    [15]
    15. The method according to claim 13 or 14, characterized in that the surface of the calender roll is coated with carbide or a ceramic mixture.
    [16]
    16. The method according to any one of claims 1 to 15, characterized in that the flexographic printing is carried out without separate drying.


    [17]
    17. The method according to any one of claims 1 to 16, characterized in that a quantity of water which uses a printing unit for flexographic printing, at least lg / qm water.
    [18]
    18. The method according to any one of claims 1 to 17, characterized in that a printing time delay between printing units for flexographic printing is a maximum of 200 ms. Vienna, April 17, 2012 Metso Paper, Inc. by:

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    引用文献:
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    JP2008302650A|2007-06-11|2008-12-18|Mitsubishi Heavy Ind Ltd|Printing method by offset printing machine and offset printing machine|
    EP2103736B1|2008-03-18|2016-05-25|Agfa-Gevaert N.V.|Printanle paper; process for producing printable paper; and use thereof|FI127948B|2017-02-01|2019-05-31|Voith Patent Gmbh|Method and device for starch application|
    FI128981B|2018-07-27|2021-04-30|Voith Patent Gmbh|Method and device for starch application|
    法律状态:
    2016-05-15| REJ| Rejection|Effective date: 20160515 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011076718A|DE102011076718A1|2011-05-30|2011-05-30|Producing coated paper or cardboard useful for flexographic printing, comprises providing paper or cardboard with pigment coating comprising porous layer|
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