CN204728141U - 多层纸板及由其制得的用于承装液体和承装食品的纸板 - Google Patents

多层纸板及由其制得的用于承装液体和承装食品的纸板 Download PDF

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CN204728141U
CN204728141U CN201420797225.XU CN201420797225U CN204728141U CN 204728141 U CN204728141 U CN 204728141U CN 201420797225 U CN201420797225 U CN 201420797225U CN 204728141 U CN204728141 U CN 204728141U
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F.彭
A.莫伯格
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Stora Enso Oyj
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Abstract

本实用新型涉及多层纸板及由其制得的用于承装液体和承装食品的纸板，具体而言涉及具有高的松厚度和维持的强度的高品质多层纸板。所述纸板包括至少三层：表面层、背层和布置在所述表面层和所述背层之间的中间层，和所述中间层包括来自阔叶木纤维的高温化学热磨机械浆(HT-CTMP)。所述纸板具有高强度、良好的保护性以及高质量的外观，适合用作例如液体包装纸板、食品服务板、绘画纸板或者香烟纸板。

Description

多层纸板及由其制得的用于承装液体和承装食品的纸板
技术领域
本实用新型涉及具有高的松厚度(bulk)和维持的强度(maintained strength)的高品质多层纸板(paperboard)。
背景技术
存在大量的使用纸板的应用。所有这些应用具有它们自身对纸板的具体要求，因此该纸板的性能必须根据意图的最终用途而不同。
待在快速运行的自动机器上转化(例如涂覆、印刷、切割、褶皱(crease)和折叠)成包装用品的纸板必须具有所需的强度来抵抗在转化过程中产生的应变和应力。该纸板还必须具有高的抗弯曲性，不仅在转化过程中获得良好的可运行性，而且对于所需的包装性能也是关键的。对于长保存期限的产品，该包装还必须具有良好的对光、氧气和湿气的阻挡性。例如平滑性和尺寸稳定性的性能在转化过程中也是重要的。
纸板的松厚度(密度的倒数(inverse))是重要的性能，这是因为对献纸板的厚度做贡献。增加的厚度改善板的弯曲挺度。高的松厚度进一步使得造纸者能够减少纸板中纤维的量，这涉及成本节约。但是，高的松厚度常常导致内部强度的降低。造纸者的一个挑战是增加纸板的松厚度同时维持强度。
纸板通常包括1-5个层。待转化的纸板常常包括不止一个层。多层纸板常常显示出比单层纸板高的抗弯曲性指数。由三层或更多层组成的纸板包括顶层和背层(back ply)以及一个或多个中间层。
化学浆时常用于板的顶层和背层以向板提供强度和良好的印刷性质。该板的中间层可同时含有机械浆和/或化学浆。机械浆例如CTMP是合意的原料，因为它具有相当低的密度且能够以比化学浆更低的成本生产。而且，机械浆具有较高的产率并且因此具有较高的原料使用效率。在高品质板中，针叶木CTMP是用于所述中间层的最通常的机械浆，这是因为针叶木CTMP除了具有高的松厚度外，还具有能够提供良好的内部结合(bonding)的长纤维。由于化学浆的高强度性质，其通常与机械浆组合也用于中间层，作为增 强物。
专利说明书WO2006084883披露具有中间层的高品质纸板，其含有大量的阔叶木CTMP。但是，在WO2006084883中披露的纸板生产中，在维持的强度下，存在可获得多高的松厚度的上限。因此，仍然存在对具有高的松厚度和维持的强度的高品质纸板的需求。
实用新型内容
本实用新型披露了高品质纸板，其包括至少三层；表面层，中间层和背层，其中所述中间层包括至少50％、优选至少80％、更优选至少90％的来自阔叶木纤维的高温化学热磨机械浆(HT-CTMP)，以所述中间层的总纤维重量计算。
已经出乎意料地显示在中间层中使用来自阔叶木纤维的HT-CTMP使得能够生产具有非常高的松厚度且具有维持的强度性质的纸板。此外，使用来自阔叶木纤维的HT-CTMP显著改善纸板的亮度性质和形成。该纸板的中间层显示出低于400kg/m3、优选低于350kg/m3、甚至更优选低于300kg/m3的密度，至少150kPa、优选至少250kPa、最优选至少350kPa的z-强度，和至少100J/m2、优选至少150J/m2的Scott Bond值。
在所述中间纸浆中的阔叶木浆具有低于300kg/m3、优选低于250kg/m3、和甚至更优选200kg/m3的密度(纸浆片材密度，ISO 534:2005)。
本实用新型纸板的所述层中的至少一个、优选中间层可包括干强度添加剂。所述强度添加剂可选自阳离子淀粉、阴离子聚合物、纳米纤化的(nanofibrillated)纤维素、聚乙烯胺、壳聚糖、伯胺和仲胺、聚乙二胺和改性的聚丙烯酰胺以及它们的组合。所述阴离子聚合物可例如是羧甲基纤维素(CMC)和/或阴离子聚丙烯酰胺(A-PAM)。添加这样的干强度添加剂提高纸板的强度性能并且使得能够在中间层中使用高含量的来自阔叶木纤维的HT CTMP。在一个优选的实施方式中，至少一层包括至少一种阳离子聚合物(例如阳离子淀粉)和至少一种阴离子聚合物(例如阴离子CMC(羧甲基纤维素)，或者阴离子聚丙烯酰胺(A-PAM))。可在连续的(相继的)步骤中将所述阳离子和阴离子聚合物添加至形成所述层的配料(furnish)。这改善得到的板产品的强度。替代地，可将所述聚合物同时添加到混合的配料，或者将所述聚合物与混合的配料预混合。
根据本实用新型使用的阔叶木浆可例如来自桉树、山杨(aspen)、刺槐(acacia)，枫树、山毛榉、白杨(poplar)和/或桦树。
附图说明
图1是本实用新型的示意图。
具体实施方式
本实用新型的纸板是一种高品质纸板，其适合用作例如液体包装纸板、食品服务板、绘画纸板或者香烟纸板。
高品质纸板是具有高强度(以能够经受转化)、良好的保护性以及高质量的外观的纸板。
优选地，本实用新型的多层纸板包括三层；顶层、背层和至少一个中间层。所述纸板还可包括布置在所述外层和所述中间层之间的层。这些居间(intermediate)层可具有与中间层相同的或者不同的纤维组成。所述纸板可例如总共包括四或者五层。图1显示了根据本实用新型的纸板的一个实例。图1中显示的纸板包括三层：顶层(1)、中间层(2)和背层(3)。
根据本实用新型，该中间层(2)包括至少50％、优选至少80％、和更优选至少90％的阔叶木HT-CTMP，其向纸板提供高的松厚度而在最终纸板产品的强度方面没有任何显著降低。该中间层还可包括少量的漂白或者未漂白的化学浆，例如10重量％、15或20重量％，基于所述中间层的总纤维重量计算。顶层(1)优选包括阔叶木和/或针叶木化学浆，其向产品提供良好的强度和印刷性质。该背层(3)可包括阔叶木和/或针叶木化学浆。
本文所用的术语“高温化学热磨机械浆(HT-CTMP)”是指在磨浆(refining)步骤之前已经预热至至少140℃、优选至少150℃、或者甚至更优选至少160℃的温度的纸浆。
出乎意料地，已经显示可生产这样的纸板，其在中间层中含有这样高含量的来自阔叶木纤维的HT-CTPMP，且仍然维持高强度。
本实用新型的纸板还可包括干强度添加剂。可使用的干强度添加剂包括但不限于：淀粉、聚丙烯酰胺、羧甲基纤维素(CMC)、纳米纤化的多糖。在本实用新型的背景下，纳米纤化的多糖应包括用传统的纺丝技术或者使用静电纺丝而纺丝的纳米纤维素或者细菌(bacterial)纤维素。同样，微纤化的纤维 素(MFC)(也称为纳米纤维素(nanocellulose))、纤维素须(whiskers)、微晶纤维素(MCC)、纳米晶纤维素(NCC)或者再生纤维素纤维和粒子在本文中包含在纳米纤化的多糖的定义中。
在一个实施方式中，所述层中的一层、优选中间层包括阳离子淀粉和阴离子CMC。可在连续的步骤中将阳离子淀粉和阴离子CMC添加到所述层中的一层、优选所述中间层中。这可例如根据WO2006120235或WO2006041401中公开的方法来完成。这已表明进一步增加了所得纸板产品的强度性能。优选地，该中间层包括至少20kg/吨、或优选至少30kg/吨的量的阳离子淀粉，以及至少1kg/吨或至少2kg/吨的量的CMC。
测量和评价方法
以下方法和标准适用于所附权利要求的定义和以下实施例中进行的测量两者。
抗张指数:ISO 1924-3:2005
Scott Bond:TAPPI UM-403
Z-强度:SCAN-P 80:98
密度(纸板，样品1-2，表4):ISO 534:2011
脱水阻力(Drainage resistance):SCAN M3:65 
破坏应变:ISO 1924-3:2005
抗张能量绝对指数(Tensile energy abs.Index):ISO 1924-3:2005 
抗张挺度指数(Tensile stiffness index)：ISO 1924-3:2005
密度(纸浆片材密度，表1):ISO 534:2005
实施例
为了评价本实用新型的高品质纸板，进行一系列试验，其中将根据本实用新型的纸板的中央层(centerply)(待用作多层纸板的中间层的层)与纸板的常规的中央层进行比较。
研究中央层的强度性能。根据以上所指出的方法和标准进行所有的试验，根据可用标准在23℃、50％RH下适应之后，进行所有的分析。
中央层样品
使用Dymanic Sheet Former(Formette Dynamique)生产根据本实用新型的中央层样品和基于常规云杉CTMP的参比中央层样品。
在中央片样品中使用的纸浆的性能示于表1中。
在常规的中央层(样品1-3)和根据本实用新型的中央层(样品4-6)上进行比较试验。中央层的物理性质示于表2中。
表1
BSKP＝云杉/松树的漂白针叶硫酸盐浆SR°30
CTMP＝云杉的化学-热磨机械浆CSF 537ml.
HT-CTMP＝在磨浆步骤之前已经预热至170℃的温度的桦树的化学-热磨机械浆，CSF 712ml
表2
出乎意料地，比较表明在中间层中含有高含量HT-CTMP的中央层的强度性能与常规的含有来自针叶木的CTMP的中央层的强度性能相当，特别是当添加强度添加剂的时候。

Claims (13)

1.多层纸板，其特征在于所述纸板包括至少三层：表面层、背层和布置在所述表面层和所述背层之间的中间层，所述中间层包括来自阔叶木纤维的高温化学热磨机械浆(HT-CTMP)。
2.根据权利要求1的纸板，其特征在于所述中间层显示低于400kg/m3的密度，和至少150kPa的z-强度。
3.根据权利要求2的纸板，其特征在于所述中间层显示低于350kg/m3的密度。
4.根据权利要求2的纸板，其特征在于所述中间层显示低于300kg/m3的密度。
5.根据权利要求2的纸板，其特征在于所述中间层显示至少250kPa的z-强度。
6.根据权利要求2的纸板，其特征在于所述中间层显示至少350kPa的z-强度。
7.根据权利要求1至6中任一项的纸板，其特征在于所述中间层显示出至少100J/m2的Scott Bond值。
8.根据权利要求7的纸板，其特征在于所述中间层显示出至少150J/m2的Scott Bond值。
9.根据权利要求1至6中任一项的纸板，其特征在于在所述中间纸浆中的所述阔叶木浆具有低于300kg/m3的密度，所述密度是根据ISO 534:2005的纸浆片材密度。
10.根据权利要求9的纸板，其特征在于在所述中间纸浆中的所述阔叶木浆具有低于250kg/m3的密度，所述密度是根据ISO 534:2005的纸浆片材密度。
11.根据权利要求9的纸板，其特征在于在所述中间纸浆中的所述阔叶木浆具有低于200kg/m3的密度，所述密度是根据ISO 534:2005的纸浆片材密度。
12.用于承装液体的纸板，其特征在于其由权利要求1-11中任一项的纸板制得。
13.用于承装食品的纸板，其特征在于它由权利要求1-11中任一项的纸板制得。
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