CN103201426B - 改善湿纸幅的运转性能的方法、溶液的用途以及纸 - Google Patents
改善湿纸幅的运转性能的方法、溶液的用途以及纸 Download PDFInfo
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Abstract
本发明涉及用于改善湿纸幅及类似物的运转性能的方法。所述方法包括向纤维浆料中添加阳离子型聚合物,由该纤维浆料形成湿纸幅,和将阴离子型聚合物溶液施加到所述湿纸幅。本发明还涉及通过使用该方法制得的纸,并涉及包含阴离子型聚合物的溶液的用途。
Description
按照所附权利要求的前序部分,本发明涉及改善湿纸幅的运转性能的方法、溶液的用途和纸。
发明背景
经济地生产纸需要造纸机良好的运转性能。造纸机运转性能通常通过与生产速度成比例的纸幅断裂数来评估。为了获得良好的运转性能,纸必须在沿着整个造纸机生产线的各子过程中以低纸幅断裂数良好地运行。在实践中,常见的是子过程之一导致大部分的纸幅断裂,导致很差的总效率。已经注意到,许多运转性能问题发生在当纸幅仍然处于湿状态时,尤其是在从压榨部到干燥部的过程中。由此,如果要获得整个造纸生产线的高生产效率,则当纸仍湿时造纸机的开始部分的良好运转性能是有利的。
可以通过提高湿纸幅的强度来提高湿纸的运转性能。已知有许多解决方案用于提高湿纸幅的强度,如提高纸浆的打浆度、改变过程中的整体配浆组成或纸幅张力。但是,许多这些解决方案同时导致最终制得的纸的性质劣化或显著提高生产成本。例如,提高打浆度会提高卷曲,并不利地影响最终纸的性质。
传统的湿强度添加剂(其用于提高干燥的最终纸幅的湿强度)不提高湿纸幅的强度,即,从未干燥的湿纸幅的强度。这是因为湿强度添加剂在它们表现出强度改善性之前通常要求加热和固化(curing)。
制造其干燥前强度是关键因素的纸品种(papergrades)的造纸机具有高效率,但是它们的平均生产速度可能会显著低于它们的额定速度。如果能够提高湿纸幅的强度,则可以提高这些造纸机的速度。
填料,如粘土、碳酸钙、硫酸钙或滑石用于造纸以降低纸的成本和改善纸的光学性质。将填料添加到造纸机之前的浆料(stock)中。对于被涂布的纸品种,涂布颜料(其包含相同的矿物)可以通过断裂部分进入纸,其再循环回到造纸过程。填料和涂布颜料的含量通常通过在525℃下燃烧浆料或纸样品而进行的灰分含量测量来测得。
用于未涂布的文化用纸的和用于涂布的文化用纸的原纸由软木和硬木制成,其灰分含量通常为18-24%。用于基于100%软木的未涂布的文化用纸的和用于涂布的文化用纸的原纸通常具有10-17%的灰分含量。防止文化用纸中填料含量提高的一个重要的限制因素是湿纸幅运转性能。
本发明的一个目的在于最小化或甚至消除现有技术中存在的缺点。
本发明的一个目的在于提供一种改善湿纸幅及类似物的强度的有效且简单的方法。
本发明的一个目的在于提高纸的填料含量以降低造纸成本。
采用具有在下文的独立权利要求的特征部分中提出的特征的方法与设置实现这些目的。
用于改善湿纸幅及类似物的运转性能的本发明的典型方法包括:
-向纤维浆料中添加阳离子型聚合物,
-由该纤维浆料形成湿纸幅,和
-将阴离子型聚合物溶液施加到所述湿纸幅。
本发明的典型纸是通过使用本发明的方法制得的。
通常,包含溶解形式的阴离子型聚合物的溶液通过将所述溶液施加到纸幅而用于改善湿纸幅的运转性能。
现在已经令人惊讶地发现,当阴离子型聚合物溶液被(优选通过喷涂)施加到湿纸幅(其包含具有至少部分阳离子性的表面电荷的纤维)时,纤维之间的相互作用和湿纸幅的强度得到改善。不希望被理论束缚,假定施加的阴离子型聚合物被具有阳离子电荷的纤维表面上的电子相互作用吸附或粘附。可以通过化学品与纤维之间的分子水平相互作用来影响湿纸幅强度的提高。这可以提升纤维-纤维相互作用的量和纤维之间形成的键的强度。进一步推测,提高的纤维间分子水平相互作用,无论是静电性质的或是化学性质的,解释了湿纸幅的强度提高,而不是形成了共价键。由此将阴离子型聚合物溶液施加到湿纸幅以改善纤维彼此之间的相互作用和湿纸幅的抗张强度和/或残余张力。
还观察到,将阴离子型聚合物溶液施加到湿纸幅能够提高纸的填料含量。当通过采用本发明来提高应变后的纸幅湿强度或张力时,可以使用在原纸中的高填料含量,对于由软木和硬木混合物制得的未涂布的文化用纸与涂布的文化用纸原纸,对应于例如超过25%的灰分含量。相应地,对于基于100%软木的未涂布的文化用纸和涂布的文化用纸原纸,可以使用在原纸中的高填料含量,该高填料含量对应于超过18%的灰分含量。在初始湿纸幅强度和干强度方面的改善使得也能够提高其它纸和纸板品种的灰分含量,例如对于新闻纸品种,灰分含量提高至5-17%,或者对于SC和LWC原纸,灰分含量提高至8-14%。
初始湿纸幅强度的改善还可用于改变为更廉价的原材料混合物用于浆料。例如,较少的旧瓦楞纸箱(OCC)和更多的从家庭收集的纸用于制造箱板纸(testliner)或瓦楞纸(flutingboard)品种。回收的基于纤维的瓦楞纸或箱板纸的灰分含量可以提高超过15%。
利用改善的初始湿纸幅强度的另一种方式是降低在压榨机处的线负荷,这改善纸的干强度并降低孔隙率。这会有益于适印性。
阴离子型聚合物溶液可以被施加到湿纤维幅材,并且可以以任何合适的方式进行所述施加,例如通过喷涂或涂覆。还可以通过使用薄膜转印(如薄膜转印到压榨带)、泡沫层施加或从单独的流浆箱进料阴离子型聚合物溶液来施加阴离子型聚合物溶液。优选通过喷涂来施加阴离子型聚合物溶液。已经发现,将阴离子型聚合物溶液喷涂到纤维幅材提供了许多令人惊讶的优点。聚合物溶液的喷涂不影响纸幅的形成,由此在最终纸性质方面没有要注意的负面作用。另一方面,已经注意到,阴离子型聚合物溶液在幅材的保留要好于将聚合物溶液添加到浆料中。这意味着阴离子型聚合物的用量可以保持较低,并且可以使化学品的损耗最小化。已经观察到,当通过喷涂添加阴离子型聚合物溶液时,该聚合物在整个幅材中均匀分布。在幅材的表面和芯部分之间观察不到聚合物量的差异。
优选地,将阴离子型聚合物施加到湿纸幅对最终的干纸的密度不产生影响。这可能表明,施加阴离子型聚合物提高了湿纸幅中纤维-纤维键的强度,但是可能不增加这些键的数目。还令人惊讶的是,喷涂阴离子型聚合物可以提高最终的干纸的透气性,甚至平均提高35%。
阴离子型聚合物溶液是包含溶解在溶剂(通常为水)中的阴离子型聚合物的溶液。阴离子型聚合物溶液可以包含溶解和分散形式的阴离子型聚合物,只要溶解的阴离子型聚合物的量足以获得所需效果即可。按照本发明的一个实施方案,用于本发明的阴离子型聚合物溶液可以不含离散的聚合物颗粒。阴离子型聚合物溶液可以包含一种阴离子型聚合物,或者其可以包含不同的溶解的阴离子型聚合物的混合物,例如两种或三种阴离子型聚合物的混合物。该实施方案意味着向湿纸幅施加阴离子型聚合物溶液,该溶液包含不同的阴离子型聚合物的混合物,例如两种或三种阴离子型聚合物的混合物。在阴离子型聚合物溶液包含多种不同的溶解的阴离子型聚合物的情况下,聚合物的阴离子性(anionicity)可以彼此不同。换句话说,溶液可以包含两种或多种具有不同阴离子性的溶解的阴离子型聚合物。
按照一个实施方案,可以将两种或多种阴离子型聚合物溶液顺序施加在湿纸幅上,优选通过喷涂。这意味着将第一阴离子型聚合物溶液施加到湿纸幅,随后将第二和任选的其后的阴离子型聚合物溶液施加到湿纸幅。该施加优选通过喷涂进行。
按照本发明的一个实施方案,阴离子型聚合物溶液包含合成阴离子型聚合物,如阴离子型聚丙烯酰胺,或羧甲基纤维素(CMC)或其它阴离子型高分子量聚合物,如阴离子淀粉、阴离子瓜尔胶或藻酸盐。将这种阴离子型聚合物溶液施加在湿纸幅上。羧甲基纤维素是通过将羧甲基引入纤维素链而制得的阴离子型聚合物,纤维素主链的取代度和链长度影响其性质。当取代度超过0.3时,羧甲基纤维素变成水溶性的。
按照本发明的一个实施方案,还可以通过使用两性聚合物获得阴离子型聚合物溶液,只要其在造纸过程的pH下的净电荷为阴性即可。
通常,阴离子型聚合物溶液的浓度为<1重量%,更通常为0.05-1重量%,再更通常为0.2-0.6重量%。
按照本发明的一个实施方案,将合成阴离子型聚合物的溶液作为阴离子型聚合物溶液施加到湿纸幅。合成阴离子型聚合物可以例如选自完全或部分水解的聚丙烯酰胺,或包含至少一种阴离子单体的均聚物或共聚物,所述阴离子单体例如(甲基)丙烯酸、马来酸、巴豆酸、衣康酸、乙烯基磺酸、2-丙烯酰胺-2-甲基丙磺酸、苯乙烯磺酸、乙烯基膦酸或乙二醇甲基丙烯酸酯磷酸酯。也可以包括不带电荷的单体。合成阴离子型聚合物优选是丙烯酰胺与一种或多种阴离子共聚单体的共聚物。乙醛酸化阴离子丙烯酰胺共聚物也适用于本发明。合成阴离子型聚合物可以是酸形式或盐形式,并且其可以是直链、支链或略微交联的。
在本申请中,共聚物指的是这样的聚合物,其由至少两种不同的单体组成。形成共聚物的不同单体的数目可以大于两种,例如三种或四种。
合成阴离子型聚合物的重均分子量(MW)通常为>100,000g/mol,更通常为>1,000,000g/mol。
按照本发明的一个实施方案,阴离子型聚合物溶液在湿纸幅上的施加可以通过喷涂浓度为0.3-0.5重量%的合成阴离子型聚合物溶液来进行。优选地,将合成阴离子型聚合物的溶液喷涂到湿纸幅。适用于本发明的溶液可以例如通过将合成阴离子型聚合物粉末溶解在水中以形成0.3-0.5%w/w的溶液来获得。还可以通过溶解合成阴离子型聚合物的乳液或分散液来获得溶液。
可以优选通过喷涂将阴离子型聚合物以≤2g/m2、通常0.05-1.5g/m2、更通常≤1g/m2、最通常0.05-1g/m2、优选0.05-0.5g/m2、更优选0.05-0.3g/m2的量施加到湿纸幅。
用于造纸的天然未改性纤维素纤维、木质纤维素纤维或木质纤维的表面电荷通常是阴离子型的。按照本发明的一个实施方案,纤维的表面电荷被控制为至少部分阳离子性的,也就是说,纤维可以具有带阳离子性电荷的表面区域,即使它们可以具有其它带阴离子性电荷的表面区域。这可以通过将纤维的至少一部分改性以便至少部分地改变它们的表面电荷来获得。例如,用于制造纸幅的纤维的表面电荷可以通过向浆料中添加阳离子型聚合物而部分或完全地改性。
添加到浆料中的阳离子型聚合物可以是任何适于用在浆料中的阳离子型聚合物。添加到纤维浆料中的阳离子型聚合物可以选自壳聚糖,阳离子化的多糖,如阳离子淀粉或阳离子瓜尔胶,或阳离子合成聚合物,如阳离子丙烯酰胺共聚物、乙烯基胺共聚物或聚酰氨基胺。乙醛酸化阳离子型聚丙烯酰胺也可以用作本发明中的阳离子型聚合物。阳离子型聚合物还可以是描述在例如US7,786,238B2中的阳离子淀粉接枝共聚物。添加到浆料中的阳离子型聚合物优选是阳离子淀粉。
当添加到纤维浆料中的阳离子型聚合物是阳离子型丙烯酰胺聚合物时,其可以由水溶性烯类不饱和单体或由包括阳离子型单体的单体共混物形成。阳离子型丙烯酰胺聚合物优选具有至少1.0dl/g、更优选至少1.5dl/g的表观特性粘度。
按照本发明的一个实施方案,阳离子型聚合物可以是两性聚合物,只要在造纸过程的pH下其净电荷为阳离子性即可。
在其中将合成阳离子型聚合物添加到浆料中的本发明的实施方案中,优选添加到具有>2%、优选3-5%的稠度的稠浆料中。合成阳离子型聚合物通常且优选以0.5-5kg/t的量添加到稠浆料中。添加到浆料中的合成阳离子型共聚物优选具有低电荷密度,例如阳离子型丙烯酰胺共聚物通常是在pH4下具有<1.7meq/g、优选<1.2meq/g的电荷的低电荷阳离子型丙烯酰胺共聚物。
按照本发明的一个实施方案,通过将阳离子化的多糖(如阳离子淀粉或阳离子瓜尔胶)添加到纤维浆料中而使纤维的表面电荷改性。阳离子化的多糖(如阳离子淀粉或阳离子瓜尔胶)优选在纸浆存储塔和短循环***之间添加到具有例如2-5%的稠度的稠浆料中。阳离子淀粉可以是任何适用于造纸的阳离子淀粉,如马铃薯、大米、玉米、蜡质种玉米、小麦、大麦或木薯淀粉。支链淀粉含量>75%的淀粉是有利的。通常,阳离子淀粉包含阳离子基团,如季铵基团,其取代度(DS)——表示在淀粉中平均每葡萄糖单元上的阳离子基团的数目——通常为0.01-0.20,优选0.01-0.06。阳离子淀粉通常具有0.06-1.04meq/g、优选0.06-0.35meq/g的电荷。淀粉可以以2-20kg/吨纸浆、通常7-12kg/吨纸浆的量使用。
当纸幅的干燥度为<50%、通常<40%、更通常<30%、最通常8-15%时可以将阴离子型聚合物溶液施加到湿纸幅。当纸浆悬浮液进入流浆箱并由此进入造纸机时,其干燥度水平通常大于或等于0.3%且小于2%。当幅材从流浆箱进入网部(wiresection)时在重力驱动下首次从幅材中除去水。随着纸在网部中进一步行进时,通过不同的真空单元辅助除水。在网部之后,纸的干燥度通常为20%。在湿压榨过程中,纸的干燥度提高至40-50%。优选在网部的最后真空区之前优选通过喷涂进行阴离子型聚合物溶液的施加。
按照本发明的一个实施方案,在造纸机的压榨部之前将阴离子型聚合物溶液施加到湿纸幅。
当制造不含木浆的未涂布的和涂布的纸品种时,本发明对于改善湿纸幅的强度是有利的。本发明还适于当制造包括但不限于超级砑光(SC)纸、超轻重量涂布(ULWC)纸、轻重量涂布(LWC)纸和新闻纸的纸品种时改善湿纸幅的强度。典型的涂布的杂志纸,如LWC,包含约40-60重量%的机械纸浆、约25-40重量%的漂白软木浆和约20-35重量%的填料和/或涂布剂。SC纸包含约70-90重量%的机械纸浆和约10-30%的长纤维纤维素纸浆。用于制造喷墨打印用记录基底的纸幅尤其适于按照本发明的方法处理。纸幅可以包含来自硬木树或软木树的纤维或两种纤维的组合。纤维可以通过通常用于造纸的任何合适的制浆或精制技术获得,如热机械制浆(TMP)、化学机械制浆(CMP)、化学热机械制浆(CTMP)、磨木制浆、碱性硫酸盐法(kraft)制浆、酸性亚硫酸盐法制浆和半化学法制浆。纸幅可以仅包含原始纤维或回收纤维或二者的组合。最终纸幅的重量为30-800g/m2,通常为30-600g/m2,更通常为50-500g/m2,优选60-300g/m2,更优选60-120g/m2,再更优选70-100g/m2。
在一些实施方案中,纸幅可以包含源自非木质材料,如竹子、甘蔗渣、***、麦秸或稻秸的纤维。
按照另一个实施方案,在施加阳离子型或两性聚合物溶液之前或之后进行阴离子型聚合物溶液到湿纸幅的施加。这种类型的聚合物顺序施加到湿纸幅(优选通过喷涂)可以产生干和湿纸幅强度的显著改善。阴离子型和阳离子型聚合物溶液也可以在其优选通过喷涂施加到湿纸幅之前预先混合在一起。在这种实施方案中,将阳离子型聚合物添加到纤维浆料中并不是必须的,但是可以实施。
例如,在将阴离子型聚合物溶液施加到湿纸幅之前或之后,在压榨部之前在湿纸幅上施加羧甲基纤维素(CMC)、聚乙烯醇(PVA)、改性聚乙烯醇、瓜尔胶和/或壳聚糖的聚合物溶液。羧甲基纤维素、聚乙烯醇、改性聚乙烯醇、瓜尔胶或壳聚糖可以一次施加一种,或它们的两种或三种可以顺序施加。当幅材具有高于大约55%的干燥度时,CMC与壳聚糖改善湿幅材强度,且PVA在较低的幅材干燥度水平下也改善湿纸幅强度。阴离子型和阳离子型聚合物的聚电解质多层提高纤维-纤维接合处的分子接触面积,并由此提高了干纸的强度。现在已经注意到,聚合物的分层,例如两层,也可以显著改善湿纸幅的强度。这表明,聚合物的分层可以提高湿状态下纤维之间的相互作用。将阴离子型聚合物喷涂到最外层可以降低湿纸幅与造纸机上阴离子中辊之间的粘附,这似乎也是合理的。在通过喷涂在造纸机上生成聚合物双层或多层的过程中,有利地使喷涂的聚合物的量最小化。
按照再一个实施方案,在压榨部或干燥部之前将一层或多层化学品溶液施加到湿纸幅。向纤维浆料中添加阳离子型聚合物并非必须,但是可以实施。阳离子型聚合物如上文所定义。如本申请所述,化学品溶液优选通过喷涂施加到湿纸幅,但是它们可以通过涂覆、薄膜转印、泡沫层施加或从单独的流浆箱进料而施加。例如通过喷涂施加到纸幅的化学品溶液可以是羧甲基纤维素(CMC)、聚乙烯醇(PVA)、壳聚糖或瓜尔胶的溶液。瓜尔胶在这里理解为半乳甘露聚糖。它是一种包含半乳糖和甘露糖的多糖。瓜尔胶的骨架是β1,4-连接甘露糖残基的直链,其上每第二个甘露糖处1,6-连接有半乳糖残基形成短的侧链。瓜尔胶可以以天然瓜尔胶、阴离子瓜尔胶或阳离子瓜尔胶的形式施加到幅材。例如,天然瓜尔胶、阳离子瓜尔胶或阴离子瓜尔胶可以施加到湿纸幅,所述湿纸幅在没有向浆料中添加阳离子型聚合物的情况下形成。在另一实例中,天然瓜尔胶或阴离子瓜尔胶可以施加到湿纸幅,所述湿纸幅由向其中添加有阳离子型聚合物(如阳离子瓜尔胶)的浆料形成。
试验
实施例1
可商购自芬兰造纸厂的从未干燥的漂白软木牛皮纸浆被用作原材料。根据标准SCAN-C21:65测得纸浆的加拿大标准游离度(CSF)值为500ml。
通过采用用再循环白水制备实验室纸页的标准SCAN-CM64:00形成克重为60g/m2的湿手抄纸(handsheet)。对于每页纸,将在T=97℃下蒸煮30分钟的阳离子淀粉单独添加到纸页成形器中的配料中。添加的阳离子淀粉的量为10kg/t(Raisamyl135淀粉DS0.035,BASF)。作为对照,不使用阳离子淀粉。
将阴离子型聚合物溶液喷涂到成型的手抄纸上,所述手抄纸粘附在网上,下方施加真空。真空增强喷涂过程中阴离子型聚合物溶液向湿纸页中的渗透。喷涂的阴离子聚丙烯酰胺(来自KemiraOyj的FennopolA8500R)的浓度为0.3%w/w稠度,并在喷涂前在室温下混合整夜。用水喷涂对照纸页。
在喷涂后,将手抄纸湿压。在两种不同的压力水平(50kPa和350kPa)下进行湿压,以达到湿手抄纸的两种不同的干燥度。将湿样品切割成宽度20mm,样品长度100mm。湿样品在气密条件下在7℃的温度下储存在塑料袋中以保持干燥度水平。
干纸样品和湿纸样品的机械性质用使用1.0m/s速度的冲击装置(VTTFinland,FASTTENSILETESTRIGIMPACT)测定。冲击装置和测试方法描述在下列文献中:Kurki,M.,Kouko,J.,Kekko,P.,Saari,T.,Laboratoryscalemeasurementprocedureofpapermachinewetwebrunnability:Part1,PaperijaPuu,86(2004)4;和Kouko,J.,Salminen,K.,Kurki,M.,Laboratoryscalemeasurementprocedureofpapermachinewetwebrunnability:Part2,PaperijaPuu,89(2007)7-8。
结果显示在图1中,表明所研究的施加方法对纸的初始湿强度的影响。图1中使用下列缩写:
CS=阳离子淀粉
A-PAM=阴离子聚丙烯酰胺
即使参照目前看来最为实用和优选的实施方案对本发明进行了描述,但要理解的是,本发明不限于上述实施方案,本发明还意欲覆盖所附权利要求范围内的不同修改和等同技术方案。
Claims (21)
1.用于改善湿纸幅的运转性能的方法,包括:
-向纤维浆料中添加阳离子型聚合物,
-由所述纤维浆料形成湿纸幅,
其特征在于,
当所述纸幅的干燥度为<50%时,在造纸机的压榨部之前将阴离子型聚合物溶液施加到所述湿纸幅,所述阴离子型聚合物溶液包含:
-羧甲基纤维素(CMC),
-阴离子淀粉,
-阴离子瓜尔胶,
-藻酸盐,或者
-合成阴离子型聚合物,其选自完全或部分水解的聚丙烯酰胺;或
包含至少一种阴离子单体的均聚物或共聚物。
2.根据权利要求1所述的方法,其特征在于,所述阴离子单体选自(甲基)丙烯酸、马来酸、巴豆酸、衣康酸、乙烯基磺酸、2-丙烯酰胺-2-甲基丙磺酸、苯乙烯磺酸、乙烯基膦酸和乙二醇甲基丙烯酸酯磷酸酯。
3.根据权利要求1所述的方法,其特征在于,所述合成阴离子型聚合物是丙烯酰胺与一种或多种阴离子共聚单体的共聚物。
4.根据权利要求1所述的方法,其特征在于,所述合成阴离子型聚合物的重均分子量(MW)为>100,000g/mol。
5.根据前述权利要求1至4中任一项所述的方法,其特征在于,以≤2g/m2的量将所述阴离子型聚合物施加到所述湿纸幅。
6.根据权利要求1所述的方法,其特征在于,所述阴离子型聚合物溶液的施加通过喷涂、通过涂覆、通过使用薄膜转印、通过泡沫层施加或通过从单独的压头箱进料所述阴离子型聚合物溶液来进行。
7.根据权利要求6所述的方法,其特征在于,所述阴离子型聚合物溶液在所述湿纸幅上的施加通过喷涂浓度为0.3-0.5重量%的合成阴离子型聚合物溶液来进行。
8.根据权利要求1所述的方法,其特征在于,将阴离子型聚合物溶液施加到所述湿纸幅,所述阴离子型聚合物溶液包含不同阴离子型聚合物的混合物。
9.根据权利要求1所述的方法,其特征在于,通过喷涂将两种或多种阴离子型聚合物溶液顺序施加在所述湿纸幅上。
10.根据权利要求1所述的方法,其特征在于,当所述纸幅的干燥度为8-15%时,将所述阴离子型聚合物溶液施加到所述湿纸幅。
11.根据权利要求1所述的方法,其特征在于,在网部的最后真空区之前将所述阴离子型聚合物溶液施加到所述湿纸幅。
12.根据权利要求1所述的方法,其特征在于,添加到所述纤维浆料中的所述阳离子型聚合物选自壳聚糖;阳离子化的多糖,如阳离子淀粉或阳离子瓜尔胶;或阳离子合成聚合物,如阳离子丙烯酰胺共聚物、乙烯基胺共聚物或聚酰氨基胺。
13.根据权利要求12所述的方法,其特征在于,将合成阳离子型聚合物以0.5-5kg/t的量添加到具有>2%的稠度的稠浆料中。
14.根据权利要求12或13所述的方法,其特征在于,将阳离子型丙烯酰胺聚合物添加到纤维浆料中,所述阳离子型丙烯酰胺聚合物由水溶性烯类不饱和单体或由包括阳离子型单体的单体共混物形成,所述阳离子型丙烯酰胺聚合物具有至少1.0dl/g的表观特性粘度。
15.根据权利要求12所述的方法,其特征在于,将阳离子化的多糖,如阳离子淀粉或阳离子瓜尔胶添加到纤维浆料中。
16.根据权利要求15所述的方法,其特征在于,在纸浆存储塔和短循环***之间以7-12kg/吨纸浆的量将取代度(DS)为0.01-0.06的阳离子淀粉添加到稠度为2-5%的稠浆料中。
17.根据权利要求1所述的方法,其特征在于,在将阳离子型或两性聚合物溶液施加到所述湿纸幅之前或之后通过喷涂进行所述阴离子型聚合物溶液到所述湿纸幅的施加。
18.根据权利要求15所述的方法,其特征在于,在将所述阴离子型聚合物溶液施加到所述湿纸幅之前或之后,在压榨部之前在所述湿纸幅上施加聚乙烯醇(PVA)、改性聚乙烯醇、瓜尔胶和/或壳聚糖的聚合物溶液。
19.通过使用权利要求1至18中任一项所述的方法制得的纸。
20.包含阴离子型聚合物的溶液用于通过将所述溶液施加到湿纸幅来改善所述湿纸幅的运转性能的用途。
21.根据权利要求20所述的用途,其特征在于,当制造不含木浆的未涂布纸、不含木浆的涂布纸、超级砑光(SC)纸、超轻重量涂布(ULWC)纸、轻重量涂布(LWC)纸或新闻纸时改善所述湿纸幅的强度。
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CN115093616B (zh) * | 2022-06-11 | 2023-06-16 | 云南杰商科技有限公司 | 魔芋甘露聚糖环保型复合纸箱及其制备方法 |
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- 2011-09-30 CN CN2011800476775A patent/CN103140626A/zh active Pending
- 2011-09-30 ES ES11770850.3T patent/ES2674881T3/es active Active
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- 2011-09-30 US US13/876,325 patent/US20130299109A1/en not_active Abandoned
- 2011-09-30 EP EP11770475.9A patent/EP2622131B1/en active Active
- 2011-09-30 EP EP11770850.3A patent/EP2622132B1/en active Active
- 2011-09-30 WO PCT/FI2011/050843 patent/WO2012042116A1/en active Application Filing
- 2011-09-30 PT PT117708503T patent/PT2622132T/pt unknown
- 2011-09-30 CN CN201180047192.6A patent/CN103201426B/zh active Active
- 2011-09-30 BR BR112013007244A patent/BR112013007244A2/pt not_active IP Right Cessation
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EP2622132B1 (en) | 2018-04-04 |
BR112013007876A2 (pt) | 2019-08-27 |
WO2012042115A1 (en) | 2012-04-05 |
BR112013007876B1 (pt) | 2020-12-29 |
ES2674881T3 (es) | 2018-07-04 |
FI20106021L (fi) | 2012-04-02 |
US20130299109A1 (en) | 2013-11-14 |
FI125713B (fi) | 2016-01-15 |
FI20106021A (fi) | 2012-04-02 |
ES2791997T3 (es) | 2020-11-06 |
CN103201426A (zh) | 2013-07-10 |
CA2813148C (en) | 2018-02-06 |
FI20106021A0 (fi) | 2010-10-01 |
PT2622132T (pt) | 2018-07-03 |
WO2012042116A1 (en) | 2012-04-05 |
CA2813148A1 (en) | 2012-04-05 |
EP2622131A1 (en) | 2013-08-07 |
BR112013007244A2 (pt) | 2016-06-14 |
CN103140626A (zh) | 2013-06-05 |
EP2622132A1 (en) | 2013-08-07 |
EP2622131B1 (en) | 2020-02-26 |
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