• 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:
    23 ABSTRACT A pulp mixture comprising a first pulp and a second pulp is disclosed. The first pulp is a chemicalsoftwood pulp which has been subjected to HC and LC refining. The second pulp may be a CTMP,TMP or a LC refined chemical softwood pulp. By means of the pulp mixture it is possible to produce a paper web with high strength in Z-direction and high bulk.
    公开号:SE539344C2
    申请号:SE1550239
    申请日:2015-03-02
    公开日:2017-07-18
    发明作者:Tubek Lindblom Anna
    申请人:Billerudkorsnäs Ab；
    IPC主号:
    专利说明:

    or paper having a density of less than 700 kg/m3 and a Z-tensile strength of more than 650 kPa (both in case of the first pulp being a bleached pulp and in the case of the first pulp being an unbleached pulp).
    According to another embodiment, the second pulp is a chemical softwood pulp refined solely by lowconsistency refining and the first pulp is present in an amount of 8-85 %, preferably 10-60 %, by dryweight of the total dry weight of the first pulp and the second pulp. By means of such a pulp mixtureit has for example been found to be possible to obtain a layer or paper having a density of less than750 kg/m3 and a Z-tensile strength of at least 550 kPa, typically of at least 600 kPa. lt has also beenfound to be possible to obtain a layer or paper of said pulp mixture having a density of less than 780 kg/m3 and a Z-tensile strength of at least 650 kPa at least for a bleached pulp mixture.
    The first pulp may suitably be a bleached chemical softwood pulp which has been subjected to highconsistency refining followed by low consistency refining with a total refining energy of the high consistency refining and the low consistency refining of 70-250 kWh/t, preferably 130-220 kWh/t.
    The first pulp may alternatively suitably be an unbleached chemical softwood pulp which has been su bjected to high consistency refining followed by low consistency refining with a total refiningenergy of the high consistency refining and the low consistency refining of 150-400 kWh/t, preferably200-360 kWh/t.
    Low consistency refining of the high consistency refined chemical softwood pulp to obtain the firstpulp may suitably be performed at a quite moderate refining energy, such as 15-40 kWh/t, preferably15-30 kWh/t.
    The first pulp may suitably have a Schopper Rielger (SR) number according to ISO 5267-1:1999 ofabove 15.0, preferably 15.2-18.8, and/or a water retention value (WRV) according to SCAN-C 62:00of above 1.55 g/g, preferably 1.58-1.90 g/g. ln case the first pulp is an unbleached pulp, the WRVmay optionally be equal to or above 1.80 g/g, whereas in the case of the first pulp is a bleached pulp, the WRV may optionally be less than 1.80 g/g.
    The pulp mixture may suitably have a Schopper Rielger (SR) number according to SO 5267-1:1999 of14.0-19.0, and/or a water retention value (WRV) according to SCAN-C 62:00 of 1.45-1.85 g/g.
    权利要求:
    Claims (20)
    [1] 1. Pulp mixture comprising a first pulp and a second pulp, the first pulp consisting of a chemicalsoftwood pulp which has been subjected to high consistency refining followed by lowconsistency refining, the second pulp consisting of a bulk increasing pulp selected from thegroup consisting of a chemi-thermomechanical pulp (CTMP), a thermomechanical pulp (TMP)and a chemical softwood pulp which has been subjected to low consistency refining withoutpreceding high consistency refining, and wherein: in the case the second pulp is a chemi-thermomechanical pulp or athermomechanical pulp, the first pulp is present in an amount of 50-90 % by dry weight ofthe total dry weight of the first pulp and the second pulp; in the case the second pulp is a chemical softwood pulp which has been subjected toa low consistency refining without preceding high consistency refining, the first pulp ispresent in an amount of 5-90 % by dry weight of the total dry weight of the first pulp and the second pulp.
    [2] 2. Pulp mixture according to claim 1, wherein the second pulp is a chemi-thermomechanicalpulp (CTMP) and wherein the first pulp is present in an amount of 60-90 % by dry weight ofthe total dry weight of the first pulp and the second pulp, preferably 75-88 % by dry weight of the total dry weight of the first pulp and the second pulp.
    [3] 3. Pulp mixture according to claim 1, wherein the second pulp is a chemical softwood pulpwhich has been subjected to low consistency refining without preceding high consistencyrefining, and the first pulp is present in an amount of 8-85 % by dry weight of the total dryweight of the first pulp and the second pulp, preferably 10-60 % by dry weight of the total dry weight of the first pulp and the second pulp.
    [4] 4. Pulp mixture according to any of the preceding claims, wherein the first pulp is a bleachedchemical softwood pulp which has been subjected to high consistency refining followed bylow consistency refining with a total refining energy of the high consistency refining and the low consistency refining of 70-250 kWh/t, preferably 130-220 kWh/t.
    [5] 5. Pulp mixture according to any of claims 1 to 3, wherein the first pulp is an unbleached chemical softwood pulp which has been subjected to high consistency refining followed by 10. 11. 12. 13. low consistency refining with a total refining energy of the high consistency refining and the low consistency refining of 150-400 kWh/t, preferably 200-360 kWh/t.
    [6] 6. Pulp mixture according to any of claims 1-4, wherein the first pulp is a bleached chemicalsoftwood pulp which has been subjected to high consistency refining followed by lowconsistency refining, said low consistency refining performed with a refining energy of 15-40 kWh/t.
    [7] 7. Pulp mixture according to any of the preceding claims, wherein the first pulp has a Schopper-Riegler (SR) number of above 15.0, preferably 15.2-18.
    [8] 8. , and/or a water retention value (WRV) of above 1.55 g/g, preferably 1.58-1.90 g/g. Pulp mixture according to any of the preceding claims, wherein the pulp mixture has a SR number of 14.0-19.0 and/or a WRV of 1.45-1.85 g/g. Pulp mixture according to any of the preceding claims further comprising at least one additional component, preferably a filler. Method of producing a pulp mixture according to any of the preceding claims, the methodcomprising subjecting a chemical softwood pulp to a high consistency refining step and asu bsequent low consistency refining step thereby obtaining said first pulp, mixing said first pulp with at least said second pulp such as to achieve said pulp mixture. Method according to claim 10, wherein the chemical softwood pulp is a bleached chemicalsoftwood pulp and wherein the total refining energy used during the high consistencyrefining and the low consistency refining thereof so as to provide said first pulp is 70-250 kWh/t, preferably 130-220 kWh/t. Method according to claim 10, wherein the chemical softwood pulp is an unbleachedchemical softwood pulp and wherein the total refining energy used during the highconsistency refining and the low consistency refining thereof so as to provide said first pulp is 150-400 kWh/t, preferably 200-360 kWh/t. Method according to any of claims 10 to 12, wherein the refining energy during the lowconsistency refining of the chemical softwood pulp subjected to high consistency refining followed by low consistency refining is 15-40 kWh/t. 14. 15. 16. 17. 18. 19. 20. Method according to any of claims 10 to 12, wherein the second pulp is provided bysu bjecting a chemical softwood pulp to a low consistency refining step, without anypreceding high consistency refining step, said low consistency refining step performed at a refining energy of 20-60 kWh/t, preferably 25-55 kWh/t. Paper product obtained by the pulp mixture according to any of claims 1 to 9, having a density of less than 750 kg/m3 and a Z-tensile strength of at least 550 kPa. Paperboard comprising a layer formed from the pulp mixture according to any of claims 1 to 9. Paperboard according to claim 16, comprising a plurality of layers and wherein the layermade of the pulp mixture according to any of claims 1 to 9 constitutes a middle layer of said paperboard. Method for producing a multi-layered board having a middle layer, wherein the middle layer is formed from a pulp mixture according to any of the claims 1 to
    [9] 9. Method for producing a multi-layered board having a middle layer, the method comprisingproducing a pulp mixture in accordance with the method of any of claim 10 to 14 and forming the middle layer from said pulp mixture. Fine paper obtained by the pulp mixture according to any of claims 1 to 9.
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    同族专利:
    公开号 | 公开日
    EP3265609B1|2020-09-23|
    WO2016140609A1|2016-09-09|
    SE539344E|2020-02-11|
    SE1550239A1|2016-09-03|
    EP3265609A1|2018-01-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE9402101L|1994-06-15|1995-12-16|Moelnlycke Ab|Light dewatering, bulky, chemical-mechanical pulp with low tip and fine material content|
    SE510506C2|1997-07-09|1999-05-31|Assidomaen Ab|Kraft paper and process for making this and valve bag|
    EP1799905B1|2004-10-15|2011-12-14|Stora Enso Ab|Process for producing a paper or board and a paper or board produced according to the process|
    US20070215301A1|2006-03-17|2007-09-20|Weyerhaeuser Co.|Method for making a low density multi-ply paperboard with high internal bond strength|
    EP1936032A1|2006-12-18|2008-06-25|Akzo Nobel N.V.|Method of producing a paper product|
    SE535014C2|2009-12-03|2012-03-13|Stora Enso Oyj|A paper or paperboard product and a process for manufacturing a paper or paperboard product|EP3418446A1|2017-06-21|2018-12-26|BillerudKorsnäs AB|Pulp mixture|
    EP3502348B1|2017-12-21|2020-06-24|BillerudKorsnäs AB|Fibre fractionation|
    CN112041502A|2018-03-27|2020-12-04|马拜欧麦斯私人有限公司|Unbleached pulp product and method for producing same|
    法律状态:
    2020-02-11| RPOP| Patent has been republished in amended form after opposition|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1550239A|SE539344E|2015-03-02|2015-03-02|Pulp mixture for production of a paper product with high strength in z-direction|SE1550239A| SE539344E|2015-03-02|2015-03-02|Pulp mixture for production of a paper product with high strength in z-direction|
    EP16710843.0A| EP3265609B1|2015-03-02|2016-02-25|Pulp mixture for production of a paperboard product with high strength in z-direction|
    PCT/SE2016/050138| WO2016140609A1|2015-03-02|2016-02-25|Pulp mixture for production of a paperboard product with high strength in z-direction|
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