CN110088220B - 包含含有淀粉和细微原纤化纤维素的粘合剂的瓦楞纸板 - Google Patents

包含含有淀粉和细微原纤化纤维素的粘合剂的瓦楞纸板 Download PDF

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CN110088220B
CN110088220B CN201780067064.5A CN201780067064A CN110088220B CN 110088220 B CN110088220 B CN 110088220B CN 201780067064 A CN201780067064 A CN 201780067064A CN 110088220 B CN110088220 B CN 110088220B
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starch
adhesive
binder
corrugated board
microfibrillated cellulose
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CN110088220A (zh
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I.海斯卡宁
S.兰派宁
K.巴克福尔克
E.索科宁
J.坎库宁
C.奥林
A.奥德伯格格拉泽纳普
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Stora Enso Oyj
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    • D—TEXTILES; PAPER
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    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
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    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
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    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
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    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
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    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
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    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
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    • D21H17/24—Polysaccharides
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    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
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    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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    • B32—LAYERED PRODUCTS
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    • B32B2250/02—2 layers
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Abstract

本发明涉及包含被设置为将有沟纹的瓦楞原纸连接至衬里的粘合剂的瓦楞纸板，其中粘合剂包含淀粉和微原纤化纤维素。本发明还涉及生产所述瓦楞纸板的方法。

Description

包含含有淀粉和细微原纤化纤维素的粘合剂的瓦楞纸板
技术领域
本发明涉及包含被设置为将有沟纹的瓦楞原纸(fluted corrugated medium)连接至衬里的粘合剂的瓦楞纸板，其中粘合剂包含淀粉和微原纤化纤维素。本发明还涉及生产所述瓦楞纸板的方法。
背景技术
瓦楞纸板是可被转化为不同类型的包装方案的包装材料。瓦楞纸板是基于纤维的材料，其包含瓦楞原纸(沟纹，波纹，fluting)和至少一个连接至有沟纹的原纸(flutedmedium)的表面的平衬里或衬里板材，由此形成夹层结构。被称作瓦楞原纸的中心纸层通过使用热、水分和压力，使用瓦楞板轧机(corrugator)成形为沟纹状。一个或两个被称为衬里的平板纸(flat papers)，被胶合至瓦楞原纸的凸起端(tips)。可以不同方式形成夹层，比如在Kirwan M.，J的Paper and Paperboard.Packaging Technology，BlackwellPublishing 2005中所描述的单壁、双壁或三壁。
存在不同种类的瓦楞纸板品质，且其可包含不同类型的衬里和瓦楞原纸。不同类型的衬里的实例为硫酸盐(Kraft)衬里，白边(white top)硫酸盐衬里和测试衬里。硫酸盐衬里典型地从可被漂白或未漂白的硫酸盐纸浆生产，且包含一个或多个层，其中顶层通常被优化以提供良好的印刷表面和良好的防潮性。测试衬里主要从回收的旧瓦楞纸板生产且大部分以两层制得。而第一层总是包含回收的纤维，顶层可含有例如原生纤维以便提供较好的品质。对于瓦楞原纸，典型地使用回收的或半化学纤维。
对于所有瓦楞纸板品质而言普遍的是，其大部分由可再生材料制得，这使得其与许多其他包装材料相比是可持续的包装材料。
用粘合剂将瓦楞原纸结合至或粘附至平衬里。在连接第二衬里以生产双面瓦楞纸板之前，可使用第二胶水施加步骤在背侧上处理瓦楞原纸。基于淀粉的粘合剂是瓦楞纸板的制造中最常使用的。基于淀粉的粘合剂典型地为4组分系统，其包含载体或蒸煮的淀粉，生淀粉组分，烧碱，和硼砂。可通过多种手段调节最终粘合剂的物理性质和化学反应性，比如使用改性淀粉，通过改变硼砂浓度或使用其他交联剂。
生产出的瓦楞纸板的普遍问题在于其倾向于向上或向下卷曲。该问题还称作翘曲。瓦楞纸板卷曲最常见的原因是衬里之间水分不平衡。卷曲一般导致瓦楞纸板的转换步骤中的问题，其中板材被卡住且不能通过转换机(converting machine)由此造成生产损失。一种控制瓦楞纸板的卷曲的方式是在板材制造期间控制水分含量。例如，这描述在US4134781中。控制或减少卷曲的另一种方式是小心地选择所使用的粘合剂和施加粘合剂的方法。例如，这描述在WO11160049中，其描述了使用了一些类型的以便减少板材的卷曲。
瓦楞纸板的另一个普遍问题为搓板效应(wash-board effect)，还称作搓板化(皱缩，wash-boarding)。该效应对于包含顶层中克重较低的衬里的瓦楞纸板更为严重。搓板化是不期望的效应，其产生自瓦楞纸板制造过程，在印刷表面之后甚至可能更为明显。除了光学印刷密度差别之外，其还可降低印刷质量。
搓板效应通常与界面胶水扩散/吸收和衬里和沟纹之间的胶水在干燥期间的收缩的效应相关。随着粘合剂干燥，衬里可占据沟纹(凹槽，flutes)的轮廓。生产出瓦楞纸板的该不平整的表面因此称作搓板化。搓板化的程度取决于许多不同的特征，例如单独的瓦楞纸板材料的刚度，使用的胶水的固含量以及施加的胶水量。如果在瓦楞纸板期间施加过量的胶水，搓板效应会变大。通常在施加会导致不充分的层合的过少的胶水和会使搓板效应变大的过多的胶水之间存在平衡。还有，如果胶水具有高固含量的淀粉和高粘度，搓板效应会变小。然而，当在胶水中使用更大量的淀粉时，结合强度会下降。还有，搓板化造成较差的印刷品质，因为波状的表面对于印刷而言不是最佳的且其导致印刷的表面缠上不平整的外观。
因此需要解决上文提及的瓦楞纸板的问题。更优选地，解决方案还应当是成本有效且是环保的。
发明内容
本发明的目标是提供瓦楞纸板，其消除了或减轻了现有技术瓦楞纸板中的至少一些缺点。更具体的目标包括提供瓦楞纸板，其具有降低的搓板效应和卷曲趋势。
本发明通过所附独立独立权利要求定义。在所附从属权利要求和以下说明书中说明实施方式。
本发明涉及瓦楞纸板，包含瓦楞原纸、衬里和被设置为将有沟纹的瓦楞原纸连接至衬里的粘合剂，其中粘合剂包含淀粉和微原纤化纤维素，其特征在于微原纤化纤维素的Schopper-Riegler(SR)值高于97。已经令人惊奇地发现，包含含有淀粉和微原纤化纤维素的粘合剂的瓦楞纸板可改进瓦楞纸板的品质，其中MFC的SR值高于97。已经观察到当使用根据本发明的粘合剂时，卷曲和搓板化倾向这两者都强烈地降低。向粘合剂加入该特定类别的微原纤化纤维素已经使得可降低粘合剂在瓦楞纸板上和在瓦楞纸板中的扩散，意味着粘合剂更准确地位于其被需要的位置，其中粘合剂在瓦楞纸板的沟纹和/或衬里上以及在沟纹和/或瓦楞纸板的衬里中的渗透更少。
粘合剂优选以高于粘合剂的总固含量的50重量％的量包含淀粉，更优选高于70重量％。粘合剂优选以粘合剂的总固含量的0.5-50重量％的量包含微原纤化纤维素。粘合剂中淀粉和MFC的最优量取决于例如使用的MFC的品质，使用的淀粉的类型和得到的最终粘合剂的所期望的性质。
粘合剂中的淀粉为优选天然淀粉。粘合剂可包含生淀粉组分。粘合剂还可包含淀粉载体介质。生淀粉组分是指未蒸煮的淀粉颗粒，其通过例如碱处理或温度处理可至少部分溶胀。
优选地，衬里的克重低于160g/m2。已经显示即便当使用低克重衬里时，可生产具有更低的搓板化问题的良好品质的瓦楞纸板。
瓦楞纸板中的粘合剂的量优选为3-20g/m2(干)。
本发明还涉及用于瓦楞纸板的粘合剂，其中所述粘合剂包含淀粉和微原纤化纤维素，其中微原纤化纤维素的Schopper-Riegler(SR)值高于97。已发现加入SR值非常高的微原纤化纤维素降低了粘合剂向板材中的渗透。
粘合剂优选的固含量为10-45重量％，优选20-40重量％。微原纤化纤维素的使用显示了低剪切速率下的粘度性质可被影响，我们相信这对粘合剂在瓦楞原纸和衬里之间的界面中扩散的固着(setting)性质有显著影响。控制粘合剂在低剪切速率的流动性质的能力，例如在不改变在更高剪切速率下的流动性的情况下，对于粘合剂在吸收性或多孔基底(比如瓦楞纸和/或衬里)上的保留(hold-out)是重要的。
粘合剂优选包含高于50重量％的淀粉，基于粘合剂的总的干固含量计。粘合剂优选包含生淀粉组分和淀粉载体介质这两者，即蒸煮的和未蒸煮的淀粉两者。
粘合剂优选包含0.1-50重量％的微原纤化纤维素，基于粘合剂的总的干固含量计。
粘合剂的特征还在于与包含所述粘合剂的瓦楞纸板相关的实施方式中出现的特征。
本发明还涉及生产瓦楞纸板的方法，其包含以下步骤：提供瓦楞原纸和衬里，提供包含淀粉和微原纤化纤维素的粘合剂，其中微原纤化纤维素的Schopper-Riegler(SR)值高于97，和在瓦楞原纸和衬里之间加入粘合剂使得瓦楞原纸连接至所述衬里。
方法在提供的粘合剂优选通过碱处理或温度处理和在淀粉溶胀之前，期间或之后加入微原纤化纤维素制得。粘合剂还可涉及蒸煮淀粉以形成淀粉载体介质和在蒸煮淀粉之前、期间或之后加入微原纤化纤维素。被加入的微原纤化纤维素的温度优选高于30℃，优选高于50℃。重要的是当在蒸煮淀粉期间或蒸煮淀粉之后加入MFC时，即当淀粉的温度也被提高时，提高淀粉的温度。以这种方式，生产出的粘合剂更均匀，这导致更好品质的粘合剂，该粘合剂使得可生产具有降低的搓板化和卷曲问题的瓦楞纸板。
所述方法的特征还在于与包含所述粘合剂的瓦楞纸板相关的实施方式中和所述粘合剂的实施方式中出现的特点。
具体实施方式
本发明涉及包含瓦楞原纸(沟纹，fluting)，衬里和粘合剂的瓦楞纸板。粘合剂设置在瓦楞原纸和衬里之间使得瓦楞原纸连接至衬里。瓦楞纸板包含至少一个瓦楞原纸和至少一个衬里。瓦楞纸板优选包含至少两个衬里和至少一个瓦楞原纸。瓦楞纸板还可包含多于一个瓦楞原纸和多于两个衬里。衬里通过粘合剂连接至瓦楞原纸的至少一个表面。粘合剂优选施加至有沟纹的瓦楞原纸的至少一个表面且衬里随后连接至所述表面。
根据本发明通过在粘合剂中使用MFC，可在粘合剂施加器中具有更宽的运行挤压窗口(operating press window)而不负面影响粘合剂固着和渗透。不受任何理论的束缚，我们相信新的制剂防止较少的浸入和因此更好的粘合剂保留。粘合剂夹(nip)可在更高的压力范围且在更高的速度运行。其还赋予了在施加粘合剂和使表面结合之间更长的开口时间的可能性。还相信用胶改进了湿粘性。
粘合剂是基于可从多种植物提取的淀粉的胶。一些最常见的植物为玉米，小麦，大米，马铃薯，木薯和豌豆。淀粉优选是天然的，即没有进行淀粉改性。粘合剂还可包含水、氢氧化钠和硼酸。还可加入其他添加剂，比如改进湿强度或粘合剂结合强度的添加剂。还有，可加入为了改进例如防潮性或凝胶行为的其他功能性化学品，例如硼砂，乙二醛或其混合物。
粘合剂优选包含生淀粉组分。粘合剂还可包含淀粉载体介质。生淀粉组分是指未蒸煮的淀粉颗粒，其通过例如碱处理或温度处理和/或通过现有技术中已知的其他处理可至少部分溶胀。淀粉载体介质是指蒸煮的溶解的淀粉或可溶于冷水的淀粉。
粘合剂还包含Schopper-Riegler(SR)值高于97的微原纤化纤维素。已经令人惊奇地发现包含SR值高于97的微原纤化纤维素的粘合剂降低了瓦楞纸板的搓板化以及卷曲倾向。SR值高于97的MFC是非常细的MFC级别且令人惊奇的是细MFC品质的存在可降低搓板效应以及卷曲倾向至如此高的程度。Schopper-Riegler值可通过EN ISO 5267-1中定义的标准方法得到。.
瓦楞纸板优选包含低克重的衬里，优选低于160g/m2。令人惊奇的是即便使用低克重衬里，通过使用根据本发明的粘合剂使得搓板化问题也被显著的降低。
粘合剂的粘度取决于多种参数，但包括淀粉的类型，改性，添加剂，温度，pH，固含量和离子强度。在粘合剂中使用MFC降低了淀粉的不受控的退行降解(退化，retrodegradation)。
本发明还涉及生产瓦楞纸板的方法，其包括以下步骤：提供瓦楞原纸和衬里，提供包含淀粉和微原纤化纤维素的粘合剂，其中微原纤化纤维素的Schopper-Riegler(SR)值高于97，和在瓦楞原纸和衬里之间加入粘合剂使得瓦楞原纸连接至所述衬里。可向衬里的表面和/或向瓦楞原纸加入粘合剂并且其将瓦楞原纸和衬里彼此连接。
通过以现有技术中描述的任何且对所属领域技术人员已知的常规方式混合包括淀粉和微原纤化纤维素的粘合剂的组分形成粘合剂。粘合剂优选通过包括以下步骤形成：通过碱处理或温度处理使淀粉溶胀以形成生淀粉组分和在淀粉溶胀之前，期间或之后加入微原纤化纤维素。粘合剂还可通过蒸煮淀粉以形成淀粉载体介质和在蒸煮淀粉之前、期间或之后加入微原纤化纤维素形成。优选以水性悬浮体的形式，以脱水、浓缩和/或干燥的形式将微原纤化纤维素加入至淀粉。优选地，在加入至淀粉之前，可提高加入的微原纤化纤维素，优选包含MFC的悬浮体的温度。这是特别重要的，如果淀粉的温度被提高。通过在加入前还对MFC加热，淀粉和MFC之间的温度差降低，这会导致形成更均匀的粘合剂。加入的微原纤化纤维素的温度优选高于30℃，更优选高于50℃，甚至更优选高于70℃。MFC的温度可为50-90℃，更优选60-80℃。进一步地，调解加入的微原纤化纤维素，优选包含微原纤化纤维素的悬浮体的pH使得MFC的pH与淀粉的pH或待加入MFC的包含淀粉的混合物的pH相近。
在形成粘合剂期间，还可机械处理或温度处理MFC和淀粉的混合物。例如可使用高剪切混合和/或喷射蒸煮。
可通过任意种类的纸浆生产瓦楞纸板衬里和/或瓦楞原纸，例如化学纸浆，机械纸浆，热机械纸浆和化学热机械纸浆(CTMP)，以及中性亚硫酸盐半化学(NSSC)纸浆。纸浆还可以是原生纸浆和再生纸浆中的任一种。
微原纤化纤维素(MFC)在本专利申请的文中是指纳米尺度的纤维素颗粒纤维或至少一个维度小于100nm的纤丝。MFC包含部分或全部原纤化的纤维素或木质纤维素纤维。被释放的纤丝直径小于100nm，而实际的纤丝直径或粒径分布和/或纵横比(长度/宽度)取决于来源和制造方法。最小的纤丝被称为基元纤丝且直径为约2-4nm(见例如Chinga-Carrasco,G.,Cellulose fibres,nanofibrils and microfibrils,：The morphologicalsequence of MFC components from a plant physiology and fibre technology pointof view,Nanoscale research letters 2011,6：417)，同时常见的是基元纤丝的附聚形式，也称作微纤丝(Fengel，D.，Ultrastructural behavior of cell wallpolysaccharides，Tappi J.，March 1970，Vol 53，No.3.)，是当通过使用延长精磨方法或压降解离方法得到的主产物。取决于来源和之傲方法，纤丝的长度可在约1微米至约10微米变化。粗MFC级分(grade)可能含有显著分数的原纤化的纤维，即从管胞(纤维素纤维)突出的纤丝，和一定量的从管胞(纤维素纤维)释放出的纤丝。
MFC存在不同的缩写，比如纤维素微原纤丝、原纤化纤维素、纳米原先化纤维素、原纤丝附聚物、纳米尺度纤维素纤丝、纤维素纳米纤维、纤维素纳米纤丝、纤维素微纤维、纤维素纤丝、微原纤纤维素、微纤丝附聚物和纤维素微纤丝附聚物。MFC的特征还在于物理或物理化学性质，比如高表面积或其在分散在水中时在低固体物条件下(1-5重量％)形成凝胶状材料的能力。优选将纤维素纤维原纤化至这样的程度，所形成的MFC的最终比表面积为约10至300m2/g，或更优选30至200m2/g，当用BET方法为冷冻干燥的材料测定时。
存在多种制造MFC的方法，比如单次或多次精磨、预水解后接纤丝的精磨或高剪切解离或释放。通常需要一个或多个预处理步骤一遍使得MFC制造能量有效且为可持续的。因此，可将待提供的纸浆的纤维素纤维用酶或化学方式预处理，例如以降低半纤维素或木质素的量。在原纤化之前可将纤维素纤维化学改性，其中纤维素纤维含有不同于(或多于)原始纤维素中存在的官能团。这样的基团包括羧甲基(CMC)、醛基和/或羧基(通过N-氧基接到的氧化，例如“TEMPO”)、或季铵(阳离子纤维素)。在用上述方法之一改性或氧化之后，更容易将纤维解离成为MFC或纳米原纤尺寸或NFC。
纳米线丝纤维素可含有一些半纤维素；该量取决于植物来源。经预处理的纤维(例如经水解、预溶胀、或氧化的纤维素原材料)的机械解离，用合适的设备进行，比如精磨机、研磨机、均质机、胶体排除装置(colloider)、摩擦研磨机、超声超声波仪、流化器比如微流化器，宏观流化器或流化器型均质机。取决于MFC制造方法，产物还可能含有细料(fines)、或纳米结晶纤维素，或例如其他存在于木纤维或造纸方法中的化学品。产物还可能含有各种量的未被有效原纤化的微米尺寸的纤维颗粒。
从木纤维素纤维生产MFC，从阔叶木或针叶木纤维两者。其还可从微生物来源、农业纤维制备，麦草浆，竹子，甘蔗渣或其他非木纤维来源。其优选从包括来自原生纤维的纸浆的纸浆制得，例如机械、化学和/或热机械浆。其还可从损纸或再生纸制得。
以上描述的MFC定义包括，但不限于对纤维素纳米原纤丝(CNF)新提出的TAPPI标准W13021，其定义了含有多个具有结晶和无定型区域的基元纤丝、且具有高纵横比的纤维素纳米纤维材料，其中宽度为5-30nm且纵横比通常大于50。
实施例
通过混合5重量％的不同品质的MFC与小麦淀粉(9.6g)，水和NaOH混合，接着在45℃搅拌和加热以形成混合物而制备粘合剂。然后，在第二步骤中向混合物加入更多的小麦淀粉(75.6g)和水，并且在35℃搅拌30分钟。如果粘合剂包含10重量％的MFC，在第二步骤中还与额外的淀粉和水一起加入额外的5重量％的MFC。各粘合剂中的淀粉的量可见与表1中，其中显示了胶的固含量，其代表了粘合剂中淀粉和MFC的量。对于参照粘合剂，加入相对于淀粉重量的1.1重量％的硼砂。
加入的粗MFC级别的SR值低于97。加入的细MFC级别的SR值高于97。
粘合剂表征和在瓦楞纸板上施加粘合剂在室温(23℃)且在约12的pH进行。使用用剪切速率为0.01-1000 1/s操作的流变仪测量粘合剂的粘度。
然后将以上制备的粘合剂用于生产包含一个连接至瓦楞原纸的每一侧的衬里的瓦楞纸板。粘合剂的施加在SUW Gluability测试仪中进行且衬里的粘附强度通过PINAdhesion测试(PAT)进行。瓦楞纸板分别在两个温度干燥，即110℃和180℃。搓板效应，即瓦楞纸板的外衬里的不平整性以光学方式通过Optitopo测量。Optitopo通过从相对的方向的低角度发光，产生样品的相同区域的两个图像。然后使用光度立体”技术计算高度图。不同波长类别的形貌(topography)变化被产生且以μm提供平均搓板。
可以看出在较高剪切速率下，淀粉-MFC粘合剂的粘度类似于淀粉硼砂参照样品。根据本发明的包含MFC-淀粉的粘合剂，其中MFC的SR值高于97，表现出更强的剪切稀化行为，即在低剪切速率下粘度更高，这对于粘合剂固着是有利的。
加入SR值高于97的MFC还改进了搓板效应。还有，PAT值提高了意味着粘附性非常好。
表1:
Figure BDA0002043270160000081
Figure BDA0002043270160000091
因此，表1清楚地表明包含较细的MFC级别的粘合剂使得可生产具有改进的品质，强度良好且搓板化降低的瓦楞纸板。
鉴于本发明的上述详细描述，对于本领域技术人员来说，其他修改和变化将是显而易见的。然而，显而易见的是，在不脱离本发明的精神和范围的情况下，可以实现这些其他修改和变化。

Claims (17)

1.瓦楞纸板，包含瓦楞原纸、衬里和被设置为将有沟纹的瓦楞原纸连接至衬里的粘合剂，其中粘合剂包含淀粉和微原纤化纤维素，其特征在于微原纤化纤维素的Schopper-Riegler(SR)值高于97。
2.根据权利要求1所述的瓦楞纸板，其中粘合剂以高于粘合剂的总固含量的50重量％的量包含淀粉。
3.根据前述权利要求中任意项所述的瓦楞纸板，其中粘合剂以粘合剂的总固含量的0.5-50重量％的量包含微原纤化纤维素。
4.根据权利要求1或2所述的瓦楞纸板，其中粘合剂中的淀粉为天然淀粉。
5.根据权利要求1或2所述的瓦楞纸板，其中粘合剂包含生淀粉组分。
6.根据权利要求1或2所述的瓦楞纸板，其中粘合剂包含淀粉载体介质。
7.根据权利要求1或2所述的瓦楞纸板，其中衬里的克重低于160g/m2。
8.根据权利要求1或2所述的瓦楞纸板，其中该板以3-20g/m2的干的量包含粘合剂。
9.用于瓦楞纸板的粘合剂，其中所述粘合剂包含淀粉和微原纤化纤维素，其中所述微原纤化纤维素的Schopper-Riegler(SR)值高于97。
10.根据权利要求9所述的粘合剂，其中粘合剂的固含量为10-45重量％。
11.根据权利要求9或10所述的粘合剂，其中粘合剂包含高于50重量％的淀粉，基于粘合剂的总的干固含量计。
12.根据权利要求9或10中任意项所述的粘合剂，其中粘合剂包含生淀粉组分和淀粉载体介质这两者。
13.根据权利要求9或10中任意项所述的粘合剂，其中粘合剂包含0.1-50重量％的微原纤化纤维素，基于粘合剂的总的干固含量计。
14.生产瓦楞纸板的方法，包含以下步骤：
-提供瓦楞原纸和衬里,
-提供包含淀粉和微原纤化纤维素的粘合剂，其中微原纤化纤维素的Schopper-Riegler(SR)值高于97，和
-在瓦楞原纸和衬里之间加入粘合剂使得瓦楞原纸连接至所述衬里。
15.根据权利要求14所述的方法，其中粘合剂通过经由碱处理或温度处理使淀粉溶胀和在淀粉溶胀之前，期间或之后加入微原纤化纤维素而制备。
16.根据权利要求14-15中任意项所述的方法，其中粘合剂通过蒸煮淀粉以形成淀粉载体介质和在蒸煮淀粉之前、期间或之后加入微原纤化纤维素而制备。
17.根据权利要求15所述的方法，其中所加入的微原纤化纤维素的温度高于30℃。
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