• 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:
    fibrous blanket of paper or cardboard and a method of making the same. the invention relates to a fibrous batt product such as paper, and a method for preparing such a fibrous batt. according to the method, microfibrillated cellulose (mfc) together with a fiber slurry of greater length, such as chemothermechanical pulp (ctmp), is mixed with a foam of water and a surfactant, the foam is supplied to a forming fabric. from a paper or board machine, dehydrated by suction of air through the forming fabric, and dried to obtain the final mat product. the method gives a high volume, in combination with a high scott bonding value, to provide better wet and dry tensile strength for paper and board products.
    公开号:BR112014026792B1
    申请号:R112014026792-8
    申请日:2013-04-24
    公开日:2021-06-01
    发明作者:Kinnunen Karita；Hjelt Tuomo
    申请人:Stora Enso Oyj；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method for preparing a fibrous batt of paper or cardboard, a fibrous batt obtained by a method, and a multilayer cardboard comprising such batt as at least one of the layers. As a particular aspect, the foaming technique is used in the invention to produce the fibrous batt. Background of the invention
    [0002] In the paper industry, the foam technique, where the foam is used as a carrier phase of materials, has been used in both the mat formation and mat coating processes. The technique is described, for example, in the publications Radvan, B., Gatward, A.P.J., "The formation of wet-laid mats by a foaming process", Tappi, vol 55 (1972) p. 748; a report by Wiggins Teape Research and Development Ltd., "New process uses foam in papermaking instead of avoiding it," Paper Trade Journal, Nov 29, 1971; and Smith, M.K., Punton, V.W., Rixson, A.G., "The structure and properties of paper formed by a foaming process", TAPPI, Jan 1974, Vol. 57, No. 1, pp. 107-111.
    [0003] GB 1 395 757 describes an apparatus for producing a foamed fiber dispersion for use in papermaking. A surface active agent is added to the fibrous pulp with a fiber length in excess of about 3 mm, to provide a dispersion with an air content of at least 65%, to be discharged into the forming fabric of a manufacturing machine. of paper. The objective is to achieve a uniform formation of the fibrous mat in the tissue.
    [0004] In the mid-1970s the foaming process was successfully demonstrated on a production machine. In the Wiggins Teape Radfoam (Arjo Wiggins) process, fibers were delivered to the wire of a conventional Fourdrinier paper machine suspended in aqueous foam. The development team achieved a non-layered 3D structure on papers manufactured on a Fourdrinier machine for very high fiber concentrations (3 to 5%) in water, using foam.
    [0005] When comparing foaming and water formation methods a trend is clear. With foaming, the mass is higher, but the tensile index is lower. With a bulkier structure, the structure is more porous, which leads to lower tensile index values. An interesting result from a comparison of deposition samples with water and foam was that the tensile stiffness indices in both cases were very close, although the foaming samples were much bulkier. The reason for this is unknown and requires further research.
    [0006] Surfactants used in the foaming process have a negative effect on both the dry and wet tensile strength of a paper web.
    [0007] The loss of tensile strength can be explained by a reduction in the dry tensile strength of a sheet of paper since surfactants are adsorbed on the surfaces of the fibers preventing the hydrogen bonding between the fibers. Initial wet strength is reduced with surfactants, especially for a dry matter content of 8 to 25%, due to a reduction in surface tension, which results from the weakening of the main force holding the wet sheet together.
    [0008] According to current understanding, the main problems that have prevented foaming from becoming a standard in matting technology in the production of paper, board and cardboard are: - too high porosity in some applications, properties of reduced strength compared to normal wet formation of low consistency, - lower Scott bond, - lower tensile strength and, - lower modulus of elasticity.
    [0009] With foaming, a larger volume (lower density) can be obtained compared to normal wet foaming. For typical printing and packaging paper and paperboard grades, the main disadvantages are loss of modulus of elasticity ("softness") and internal strength (Scott bond or Z strength). However, the same features are advantages in tissue paper manufacturing. Thus, foaming has been much more common in tissue paper products.
    [0010] A more recent approach to improved papermaking, aimed at improving the drainage and retention of papermaking chemicals in a fibrous mat formed on a forming fabric, is incorporation of microfibrillated cellulose (MFC) into the pulp suspension. US 6602994 BI teaches using derivative MFC with electrostatic or steric functionality for goals, which even include better mat formation. According to the reference microfibrils have a diameter in the range of 5 to 100 nm.
    [0011] However, the disadvantages experienced with MFC are densification and high shrinkage in paper drying, as well as a tendency for MFC to absorb and retain a substantial amount of water, which increases the energy required for drying and reduces speed of the paper machine and productivity. For these reasons MFC has not gained wide use in the paper industry until now. Brief description of the invention
    [0012] The object of the present invention is to overcome or reduce the aforementioned problems in relation to printing papers and packaging and boards, by means of finding a method for making a fibrous mat formed by foam, giving a substantially increased strength for paper and board products, while still substantially preserving low density. The solution according to the invention is the production of a mat through the steps of (i) providing a water foam and a surfactant, (ii) incorporating microfibrillated cellulose together with a slurry of a longer fiber length in the foam, (iii ) feeding the foam onto a forming fabric, (iv) removing water from the foam, onto the forming fabric by means of suction to form a mat, and (v) subjecting the mat to final drying.
    In particular, it has surprisingly been found that a pulp of a high fiber length, mechanical or chemical, can be used advantageously in foaming in combination with microfibrillated cellulose. Although the use of MFC in papermaking is known as such, to the applicant's knowledge incorporating MFC into a foam had not been suggested in the prior art, and the benefits were not predictable to one skilled in the art.
    MFC microfibrils typically have a fiber length of about 100 nm to 10 µm and a fiber diameter of about 3 to 50 nm. The term microfibrillated cellulose (MFC), as used to define the invention, also encompasses nanofibrillated cellulose (NFC). Pulp combined with MFC by definition has a longer fiber length, preferably about 1 mm or more. A particularly suitable pulp for use in the invention is chemithermechanical pulp (CTMP).
    [0015] In addition to CTMP, other long fiber celluloses useful in the present invention are chemical pulps, chemomechanical pulps (CMP), thermomechanical pulp (TMP), GW, and other high yield pulps such as APMP and NSSC.
    Without being bound by any theory it is believed that the combination of long fibers of CTMP or the like provide the bulky structure and MFC provides the connection between the long fibers. The method according to the invention has been found to reach a volume of at least 2.5 cm 3 /g, preferably 3 to 7 cm 3 /g. The method has also been proven to work well with CTMP milling rejects, which shows the possibility of using less refined pulp for the product, eg middle layer of cardboard for folding box.
    [0017] In foaming, neither the individual long fibers nor the MFCs alone are able to form flakes, however, the MFCs are able to build bridges between the individual long fibers, thus providing surprisingly good weathering properties. Blanket.
    [0018] As foaming prevents the formation of flakes between long fibers, very good basis weight formation can be achieved. This improves print quality uniformity as there is less gauge variation in paper and card stock.
    [0019] These long rigid CTMP fibers are able to maintain the bulky structure in wet pressing and drying, thus providing surprisingly good mass to the sheet.
    [0020] An interesting result in comparing water deposition and foam samples was that the elastic stiffness index was very close in both cases, although the foaming samples were much bulkier. The reason for this is unknown and needs further research.
    [0021] According to an embodiment of the invention, a continuous fibrous mat is formed on an industrial scale, on a moving forming fabric of a paper or paperboard machine, dehydrated by means of suction through the mat and the fabric. formation, and finally dries in a drying section of the paper or board machine.
    [0022] Another embodiment of the invention comprises the removal of water from the mat by suction of air through the mat and the forming fabric, at a pressure of at most 0.6 bar, followed by pre-drying by air suction , at a pressure of max. approx. 0.3 bar.
    [0023] According to another embodiment of the invention, the fibrous components incorporated in the foam consist of about 5 to 40% by weight, preferably 10 to 40% by weight of MFC and about 60 to 95% by weight , preferably 60 to 90% by weight of cellulose, with longer fibers.
    [0024] According to yet another embodiment of the invention, the foam is brought to an air content of 60 to 70% by volume, before being supplied to the forming fabric. The consistency of the foamed paste can be from 1 to 2% based on the amount of water. The suitable amount of surfactant in the foam can range from 0.05 to 2.5% by weight, but will be readily determinable by one skilled in the art.
    The preferred surfactant for use in the invention is sodium dodecyl sulfate (SDS), but other typical surfactants can be used as well.
    [0026] Foaming by using long cellulosic fibers and microfibrillated cellulose added to the foam is therefore very suitable and the promising method for the production of all types of paper and board that need the best possible formation combination with better stiffness bending possible.
    [0027] Such products include, for example, all types of cardboard, such as: - cardboard, including folding box cardboard, white line chipboard, solid whitened cardboard, solid raw cardboard, liquid packaging cardboard, etc. , - cardboard for containers, including corrugated cardboard, corrugated board, etc., - special cardboard, including coreboard, wallpaper base, book-binding cardboard, cellulose cardboard, etc.
    [0028] Products also include, for example, grades of paper such as newsprint, best newsprint, rotonews, MFC, LWC, WFC, art and ULWC.
    [0029] The high-strength and high-mass structure obtained according to the invention can also be used, for example: - as an intermediate layer in multilayer structures (paper and board), - in the lamination to other paper structures and /or plastic film layers, - as a fibrous base for extrusion coating with plastic, - as thermal insulation, noise insulation, moisture and liquid absorbent, - as a layer capable of being formed into molded structures such as trays, cups, containers.
    [0030] The fiber mat according to the invention, which can be obtained by the process as described in the example above, comprises a mixture of microfibrillated cellulose (MFC) and a slurry of a longer fiber length, and has a volume of at least 2.5 cm 3 /g; preferably a volume of 3 to 7 cm 3 /g.
    [0031] The fiber mat according to the invention may have a Scott binding value of at least 50 J/m2, preferably 120 to 200 J/m2.
    [0032] The pulp of a longer fiber length in the fibrous batt according to the invention may be mechanical pulp, preferably CTMP. In general, the fibrous batt comprises about 5 to 40% by weight of MFC and about 60 to 95% by weight of pulp of a longer fiber length.
    [0033] When the fiber batt according to the invention is used as a single layer of a multi-layer board or board, it is preferably positioned as an intermediate layer, while the outer surface layers may be fibrous batts of a smaller volume than the aforementioned intermediate layer. For example, denser layers of print with a high modulus of elasticity, using conventional papermaking techniques, can constitute such outer layers. Products obtainable by the use of multiple layers of the present invention include folding cartons for boxes, liquid packaging cartons and cabinets, for example. However, it is possible to produce all layers of a multilayer board by means of the foaming technique according to the invention. Examples
    [0034] Foam-deposited manufactured sheets of a size 38.5 cm x 26.5 cm were made by the following procedure: foam was produced by mixing water and sodium dodecyl sulfate (SDS) as a surface active agent, in a proportion of 0.15 to 0.2 g/1, with a perforation machine (3500 rpm) until the air content in the foam is 60 to 70%. The target air content in the foam was determined by the foam configuration; when the foam reaches the target air content, the foam surface level no longer increases and the mixture begins to decrease the foam bubble size. When the foam was ready, a fiber suspension comprising CTMP and NFC (Daicel KY-100G, 10.7%) was mixed with the prefabricated foam. Mixing was continued until the target air content was reached again. In the steady state, the distances between the fibrous particles in the foam remained constant and flocculation did not occur. After this, the foam was decanted into a manual sheet mold and filtered through a wire with an exhaust and a vacuum chamber. The wire was of the type conventionally used for water-based forming. Then, the wire and the manual sheet formed thereon were removed from the mold and pre-dried on the suction table using an exhaust fan. The suction table has a suction groove, 5 mm wide, which sucks air through the sheet, with 0.2 bar vacuum.
    [0035] According to the above procedure, manual sheets were made from pulps with different portions of NEC mixed with accepted CTMP (379 CSF), rejects or slightly mill refined, i.e., 5, 10, 15, 20, 30 and 40%. Sheets of mere 100% CTMP (0% NFC) were made for comparison.
    [0036] Dry manufactured sheets were tested by measuring the mass and modified Scott bond for each sheet. The results are shown graphically in Figure 1. The percentage of NFC is marked next to each measured result. The figure also includes a number of current products made by conventional non-foam papermaking techniques for comparison purposes.
    [0037] Tests show that, for example, 20% NFC mixed with accepted CTMP pulp increased the Scott binding value from 55 to 190 J/m2; the corresponding volume values are 6 and 4 g/m3. The increase in CTMP rejected on the sheets was from 50 to 127 J/m2 in Scott bond and the corresponding volume values 7.4 and 5.8 g/m3. The target values of a folding carton interlayer for carton are volumes of at least 2.5 g/m3 and Scott bond > 100. The results show that foaming a folding carton interlayer for carton is possible high volume having the necessary internal strength properties of coarse fiber material blended with NFC. The possibility of forming the box-folding cardboard intermediate layer from less refined CTMP pulp is also shown by the results. The economic influences of the invention are energy savings in the refining of pulps and energy in drying the foam mat. In addition, the benefit of foaming, excellent formation, irrespective of fiber length, enables thin surface layers and folding cardboard lining layers for boxes.
    [0038] The tests also showed that the distances between the fibrous particles in flowable foam remain constant, that is, the fibers do not flocculate. When a mat is made from this type of foam, for example, by suction through the forming fabric of a papermaking machine, the fibers retain their non-flocculated state and form a mat with excellent formation. The structural pressure that the foam applies to the structure when removed is much less compared to conventional water removal, resulting in high volume. Combining foaming with drying the mat by suctioning air through the mat (eg using a suction groove) it is possible to achieve a mat solids content of over 70% and retain the high unit volume. Nanocellulose (NFC) added to the fiber material to be foamed increases the internal strength properties of the formed mat.
    权利要求:
    Claims (14)
    [0001]
    1. Method for the preparation of a fibrous batt of paper or board, characterized by the fact that it comprises the steps of: - providing a water foam and a surfactant, - incorporating microfibrillated cellulose (MFC) together with a larger fiber slurry length in the foam, - feeding the foam onto a forming fabric, - removing the foam water in the forming fabric by suction to form a mat, and - subjecting the mat to final drying.
    [0002]
    2. Method according to claim 1, characterized in that a continuous fibrous mat is formed on a forming fabric in displacement of a paper or board machine, dehydrated by means of suction through the mat and the forming fabric, and finally dries in a drying section of the card or paper machine.
    [0003]
    3. Method according to claim 1 or 2, characterized in that the mat is dehydrated by suction of air through the mat and the forming tissue, at a pressure of at most 0.6 bar, followed by pre-drying by air suction at a pressure of max. 0.3 bar.
    [0004]
    4. Method according to any one of the preceding claims, characterized in that mechanical pulp, such as chemi-thermomechanical pulp (CTMP), is incorporated into the foam.
    [0005]
    5. Method according to any one of the preceding claims, characterized in that the fibrous components incorporated in the foam consist of 5 to 40% by weight of MFC and 60 to 95% by weight of pulp with long fibers.
    [0006]
    6. Method according to any one of the preceding claims, characterized in that the foam is brought to an air content of 60 to 70% by volume, before being supplied to the forming fabric.
    [0007]
    7. Method according to any one of the preceding claims, characterized in that the surfactant is sodium dodecyl sulfate (SDS).
    [0008]
    8. Fibrous mat, obtained by the method of any of the preceding claims, characterized in that the mat comprises a mixture of microfibrillated cellulose (MFC) and a fiber slurry of greater length, and that the mat has a volume of hair minus 2.5 cm3/g.
    [0009]
    9. Fibrous blanket according to claim 8, characterized in that the blanket has a volume of 3 to 7 cm3/g.
    [0010]
    10. Fibrous batt according to claim 8 or 9, characterized in that the batt has a Scott binding value of 50 J/m2 or more, preferably between 120 and 200 J/m2.
    [0011]
    11. Fibrous batt according to any one of claims 8 to 10, characterized in that the fiber pulp of a greater length is mechanical pulp.
    [0012]
    12. Fibrous batt according to any one of claims 8 to 11, characterized in that the batt comprises 5 to 40% by weight of MFC and 60 to 95% by weight of fiber pulp of a greater length.
    [0013]
    13. Multilayer board, characterized in that at least one of the layers is a fibrous mat according to any one of claims 8 to 12.
    [0014]
    14. Multilayer board according to claim 13, characterized in that the board comprises, as an intermediate layer, a fibrous mat according to any one of claims 8 to 12, as well as outer layers having a volume smaller than the middle layer.
    类似技术:
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    BR112014026792B1|2021-06-01|FIBROUS BLANKET OF PAPER OR CARDBOARD AND A METHOD OF DOING IT
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    同族专利:
    公开号 | 公开日
    ES2617430T3|2017-06-19|
    WO2013160553A1|2013-10-31|
    EP2841649B1|2016-12-28|
    RU2621113C2|2017-05-31|
    TWI589752B|2017-07-01|
    TW201404972A|2014-02-01|
    US20150114581A1|2015-04-30|
    EP2841649A4|2015-12-16|
    FI20125462A|2013-10-27|
    UY34768A|2013-11-29|
    PL2841649T3|2017-06-30|
    CA2871554A1|2013-10-31|
    RU2014146502A|2016-06-10|
    JP2015514884A|2015-05-21|
    BR112014026792A2|2017-06-27|
    CA2871554C|2020-08-04|
    EP2841649A1|2015-03-04|
    FI124235B|2014-05-15|
    PT2841649T|2017-02-22|
    JP6307067B2|2018-04-04|
    US9334610B2|2016-05-10|
    CN104302834A|2015-01-21|
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    法律状态:
    2018-03-06| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 24/04/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20125462|2012-04-26|
    FI20125462A|FI124235B|2012-04-26|2012-04-26|Fiber-based paper or paperboard web and a process for its manufacture|
    PCT/FI2013/050460|WO2013160553A1|2012-04-26|2013-04-24|Fibrous web of paper or board and method of making the same|
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