CN112553969A - 耐油、耐油脂且耐湿的纸板 - Google Patents
耐油、耐油脂且耐湿的纸板 Download PDFInfo
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Abstract
本发明涉及耐油、耐油脂且耐湿的纸板,具体地公开了一种涂布纸板,其包括底涂层和面涂层,所述涂层大体不包含含氟化合物或蜡、展现出良好的耐油和油脂性、不具有趋于粘合的倾向并且可完全再浆化。也展现出改进的耐湿性。
Description
本申请是2017年8月11日提交的、名称为“耐油、耐油脂且耐湿的纸板”、申请号为201680009968.8的中国专利申请的分案申请。
技术领域
本公开涉及用水性涂层处理纸板以获得惊人地良好的对油和油脂渗透的耐受性的方法。纸板也具有良好的耐湿性。经处理的纸板可完全再浆化且没有任何趋于粘合的倾向。
背景技术
1. 技术领域
本公开涉及纸板基体,其具有良好的耐油和油脂性且具有完全可回收性并且没有趋于粘合的倾向。
2. 背景技术
耐油和油脂性是食品和食品服务业中纸板包装的一个首要需求。已经采用包括专用化学物质(蜡、含氟化合物、淀粉、聚乙烯醇(PVOH)、海藻酸钠等等)处理、聚合物挤出涂层(聚乙烯等等)的若干技术以提供纸板包装的耐油和油脂性。然而,用蜡处理或用聚乙烯涂布的纸或纸板(其目前被用在耐油和油脂的包装中)难以再浆化并且不如常规纸或纸板那样能够容易地回收。用诸如含氟化合物的专用化学物质处理的纸或纸板具有潜在的健康、安全和环境问题,并且科学家已经叫停在包括包装材料的普通消费产品中不必要地使用含氟化合物。
因此,仍然存在对于耐油和油脂的纸板的重要需求,所述纸板1)具有高性能,2)没有环境或者安全问题,3)可回收,且4)低成本。水性涂层是实现这些目的的前景光明的技术方案之一。然而,粘合(一卷纸板中的层粘到彼此的倾向)是水性屏障涂布的纸板的生产和转换(convert)过程中的具有挑战性的技术障碍,并且粘合也是水性屏障涂层的机上应用的主要技术障碍。此外,大多数水性屏障涂层不是可完全再浆化的。本发明解决了上文讨论的问题。
发明内容
本发明的一般目的是用两层水性涂层涂布纸板的“屏障”侧,所述两层或者是相同涂层配方或者是两种不同配方。所述两层涂层对屏障性能有协同作用。涂层能够或者被施加在造纸机上或者由离线涂布机施加。根据本发明涂布的纸板提供高耐油和油脂性,不具有粘合的任何倾向,符合安全和环境法规,可完全再浆化,并且能够以低成本生产。
在一种实施例中,公开了涂布纸板,其包括:具有第一侧和第二侧的纸板基体;与所述第一侧接触的底涂层,该底涂层包括粘结剂和颜料,该底涂层大体不包含含氟化合物或蜡;与所述底涂层接触的面涂层,该面涂层包括粘结剂和颜料,该面涂层大体不包含含氟化合物或蜡;并且其中涂布纸板具有至少为10的3M Kit(耐油脂)测试值。
在另一种实施例中,公开了涂布纸板,其包括:具有第一侧和第二侧的纸板基体;与所述第一侧接触的底涂层,该底涂层具有每3000 ft2从5至15 lbs的涂层重量并且包括粘结剂和颜料,该底涂层大体不包含含氟化合物或蜡;与所述底涂层接触的面涂层,该面涂层具有每3000 ft2从2至9 lbs的涂层重量并且包括粘结剂和颜料,该面涂层大体不包含含氟化合物或蜡;并且其中涂布纸板具有至少为10的3M Kit测试值、至少99%可再浆化,并且在100 psi的压力下在50℃下保持24小时之后没有趋于粘合的倾向。
在另一实施例中,使用粘结剂的组合提供涂布纸板的改进的耐湿性。
附图说明
图1示出用于在纸板机器上生产基料的方法;
图2示出用于通过在纸板机器上向两侧施加涂层来处理来自图1的基料的方法;
图3示出用于通过向纸板机器上的一侧施加涂层来处理来自图1的基料的方法;
图4示出用于通过向机外(off-machine)涂布机上的一侧施加涂层来处理来自图1的基料的方法;
图5示出用于测量纸板的粘合的装置。
具体实施方式
图1和图2示出用于用两层水性涂层涂布纸板幅的示例性造纸机上方法。呈环形带的形式的成型网110经过胸辊115,该胸辊115接近流浆箱120旋转。流浆箱提供传递到运动的成型网110上的具有相当低稠度(例如,大约0.5%固体)的水中纤维浆料。在第一距离230期间,水从浆料流出并且通过成型网110,从而形成湿纤维的幅300。浆料在距离130期间可以仍具有湿的表观,因为其表面上存在自由的水。随着排水继续,在某时刻下,自由水可以从表面消失,并且在距离231上,水可以继续排出,不过表面看似不存在水。
最后,幅由引纸毯或压毯携带通过一个或多个压榨装置,诸如压辊130,其通常用压力、真空且有时热的施加帮助使幅进一步脱水。在压榨之后,仍相对湿的幅300被干燥,例如使用干燥机或干燥区段401、402,以产生干幅("原料")310,其之后可以行进通过施胶压榨机510,该施胶压榨机510应用表面施胶以产生施有胶的“基料”320,该施有胶的“基料”320之后可以行进通过额外的干燥机区段403和(在图2上)诸如压光机520的平滑步骤。
基料320之后可以行进通过一个或多个涂布机。例如,涂布机530可以向幅的第一侧("C1")施加底涂层("BC"),并且底涂层可以在一个或多个干燥机区段404中被干燥。涂布机540可以向幅的第一侧施加面涂层(“TC”),并且面涂层可以在一个或多个干燥机区段405中被干燥。
如果将在两侧上涂布幅,则涂布机550可以向幅的第二侧("C2")施加底涂层,并且底涂层可以在一个或多个干燥机区段406中被干燥。涂布机560可以向幅的第二侧施加面涂层,并且面涂层可以在一个或多个干燥机区段407中被干燥。涂布机540、550的次序可以交换,使得两侧C1和C2首先被给予底涂层,且然后两侧被给予面涂层。在一些情况下,可以如图3中所示将仅涂布一侧,或者可以仅施加底涂层。在一些情况下,可以向一侧施加第三涂层。
代替如图2和图3中所示由机上涂布机施加涂层,可以如图4中所示由机外涂布机施加涂层。在这样的情况下,已经在造纸机上生产且缠绕于卷轴572上的纸板之后可以被运输(作为卷轴或作为更小的卷)到机外涂布机600,在该处纸板从卷轴572展开、由涂布机610给予底涂层、在(多个)干燥机601中干燥、由涂布机620给予可选面涂层、在(多个)干燥机602中干燥、可选地被给予进一步处理(诸如光泽压光)且之后缠绕到卷轴573上。机外涂布机能够代替地向纸板的一侧施加单个涂层,或者能够向每侧施加单个涂层,或者能够向任一侧或两侧施加多于一个的涂层。替代性地,一些涂层可以在造纸机上完成,并且额外涂层在机外涂布机上完成。
可以使用各种类型的涂层装置。图2-4中示出的涂布机是其中涂层被保持在盘中、由辊运送到幅的下表面(取决于幅路径,其可以是第一侧或第二侧中的任一者)且之后当幅围绕支承辊部分地包绕时由刮刀刮除过量涂层的装置。不过,也可以代替地使用其他涂布机类型,包括但不限于帘式涂布机、气刀涂布机、棒式涂布机、薄膜涂布机、短驻留涂布机、喷涂机和计量薄膜施胶压榨机。
可以根据成品纸板的期望性质选择涂层中所使用的具体材料。例如,如C1的一侧可以被给予提供期望的适印性的(多个)涂层,同时如C2的另一侧可以被给予提供耐油和油脂性(OGR)的(多个)屏障涂层。取决于制造偏好,可以在OGR涂层之前施加适印性涂层,或者,可以在适印性涂层之前施加OGR涂层。
在涂布机之后,可以存在额外设备以便进一步加工,诸如额外的平滑,例如光泽压光。最后幅被紧紧地缠绕到卷轴570上。
在先前的描述中且用图1-4高水平地概略描述了造纸和涂布的大体过程,我们现在转向本发明的屏障涂层。通常的水性屏障涂层常常使用(多种)专用聚合物、蜡和/或更高的聚合物粘结剂水平(相比于常规印刷涂层),但是这些涂层能够引起关于涂布纸板的可再浆化性的问题,这是因为涂层通常难以分解成可接受的大小或者趋于在用回收纤维制成的纸板中形成“胶粘物”。
此外,许多屏障涂层给予纸板或者在卷轴570、571、572、573中或者在其被再缠绕成卷之后'粘合'的倾向(层被粘在一起)。具体地在卷轴570中,可以存在来自干燥机的残余热,因为卷轴的大质量,所以残余热可能相当慢地耗散。更高的温度可以增加趋于粘合的倾向。
公知的是用常规适印性涂层涂布的纸板通常不粘合并且通常可完全再浆化。将有利的是如果不粘合且可完全再浆化的涂层也设有屏障性质。然而,常规的适印性涂层不提供令人满意的屏障性质。它们的配方具有相对低水平的粘结剂以便吸收而不是排斥流体(例如印刷墨)。
常规适印性涂层中的粘结剂量针对底涂层而言能够在按重量每100份颜料15-25份的范围中,并且针对面涂层而言在按重量每100份颜料10-20份的范围。印刷等级将往往处于这些范围的下半部分中。限制面涂层中的粘结剂量可以允许印刷墨或粘合剂容易地吸收到适印性涂层中。简单地增加粘结剂以改善屏障性质最终干扰适印性并且引起额外的问题。表1中示出对照实验的结果,其示出粘结剂与颜料之比是100:100的高粘结剂涂层配方AC-0的测试结果。颜料Clay-1、CaCO3-1和SA(苯乙烯-丙烯酸共聚物)粘结剂是与稍后针对表4和5中所示的测试所使用的材料相同的材料(但不是相同比例)。用高粘结剂水平涂层构成的单个涂层涂布的纸板显示良好的耐油和油脂性且具有为11的高3M Kit水平,但是在再制浆测试中仅具有97.2%的纤维接受。而且,在100 psi压力下24小时之后的粘合测试是不可接受的。当在38℃/90%RH.下测试样品时得到为4的粘合水平。在相同材料的稍后测试中,在将样品保持在50°C(未知湿度)下之后得到为2的粘合水平。稍后在表3中解释粘合水平;期望值为零(无粘合),并且更高的值表明粘合更加严重。
表1 高粘结剂对照的测试结果
类似的粘合和再浆化问题与使用(多种)专用聚合物和/或更高聚合物粘结剂水平(相比于适印性涂层)的许多水性屏障涂层共同存在,且具有涂布纸板不可完全回收并且在升高的温度或压力下趋于粘合的有害影响。
相比之下,本发明中所公开的创造性涂层提供易于再制浆连同良好的屏障性质,同时使用低成本且可广泛获得的常规聚合物粘结剂和常规颜料作为纸或纸板业的涂层材料。常规聚合物粘结剂可以包括但不限于,苯乙烯-丙烯酸共聚物(SA)和苯乙烯-丁二烯共聚物(SB)。苯乙烯-丙烯酸共聚物(SA)和苯乙烯-丁二烯共聚物(SB)二者或者SA和SB的共混物被用在本文所描述的示例中。选择SA或者SB作为示例中的粘结剂不意味着以任何方式是限制性的。
常规颜料被用在本发明中并且可以包括但不限于高岭土、碳酸钙等等。本文的示例中所使用的颜料被给予下述“速记”名称:
"Clay-1"高岭土,例如1号超细粘土
"Clay-2"具有高纵横比的片状粘土
"CaCO3-1"粗磨重质碳酸钙(粒子大小60%<2微米)
"CaCO3-2"细磨重质碳酸钙(粒子大小90%<2微米)。
相比于表1中的AC-0涂层的高粘结剂水平,已经发现使用中间水平的粘结剂(但大于针对适印性涂层所使用的粘结剂水平)施加多层涂层能够提供令人惊讶地良好屏障性质连同优异的可再浆化性,并且不趋于粘合。在此示出的示例使用按重量每100份颜料从25至35份的粘结剂水平,如表2中的示例配方所示。
根据表2中所示的配方制备根据本发明的屏障涂层,表2提供水性涂层(AC)配方的干部分中的主要成分的列表,该配方被用以实现令人惊讶的良好耐油和油脂性,而不存在粘合或再浆化问题(如表3和表4中所反应的那样)。
表2 涂层配方
AC1 | AC2 | AC3 | AC4 | AC5 | |
Clay-1 | 50 | 30 | 30 | ||
Clay-2 | 50 | ||||
CaCO<sub>3</sub>-1 | 50 | 45 | 45 | 25 | |
CaCO<sub>3</sub>-2 | 25 | 25 | 25 | 100 | |
SA粘结剂 | 35 | 35 | 25 | 30 | 25 |
粘结剂/颜料比 | 35/100 | 35/100 | 25/100 | 30/100 | 25/100 |
涂层中大体不使用含氟化合物。"大体不使用含氟化合物"意味着不有意使用含氟化合物,并且任何存在的量将至多是痕量。虽然在实验室实验中能够排除含氟化合物,但是由于制造各种等级的产品,痕量的这样的材料可能存在于一些造纸机系统中,或者可能通过再循环过程被引入造纸系统中。同样地,涂层中大体不使用蜡。
表2中示出的配方的粘结剂与颜料之比(按重量,粘结剂的份数与100份颜料之比)在从25到35的范围中。这大于用于通常的适印性涂层的粘结剂与颜料之比(其中期望墨的快速吸收)且小于通常的屏障涂层的粘结剂与颜料之比。因此似乎有效的粘结剂与颜料之比可以是每100份颜料大约25至大约40份粘结剂(按重量),或者每100份颜料30至35份粘结剂。不过,也许可以用稍微更大的范围实现可接受的结果(良好的3M Kit测试、不粘合以及良好的再浆化性)。
使用具有16 pt(0.016")的厚度(caliper)的全漂白硫酸盐(SBS)基体制造纸板样品。使用引导刮刀涂布机在一侧(本文被称为“屏障侧”)上用一层或双层涂层涂布样品。预期试验结果代表在生产造纸机或生产机外涂布机上可以实现的结果。
通过3M Kit测试(TAPPI标准T559 cm-02)以从1(最小的耐油和油脂性)至12(优异的耐油和油脂渗透性)的级别在“屏障侧”上测量样品的耐油和油脂性(OGR)。
通过评估屏障涂布侧和另一未涂布侧之间的粘性测试样品的粘合行为。图5中示出粘合测试的简化图示。纸板被切割成2"x2"的正方形样品。针对每种条件测试若干备份,且每个备份评估一对样品752、754之间的粘合。(例如,如果测试四个备份,则将使用四对,即八个试件。)每对均定位成一个试件752的“屏障涂布”侧接触另一试件754的未涂布侧。试件对放置成堆叠750且相邻对之间有间隔件756,该间隔件是箔、剥离纸或者甚至复印纸。整个样品堆叠被放置于图5中所示的测试装置700中。
测试装置700包括框架710。调整钮712被附接到螺杆714,该螺杆螺纹穿过框架顶部716。螺杆714的下端附接到板718,该板718压抵重型螺旋弹簧720。弹簧720的下端压抵板722,该板722的下表面724具有一平方英寸的面积。标尺726使得用户能够读取施加的力(其等于通过一平方英寸的下表面724施加到样品的堆叠的压力)。
样品的堆叠750被放置在下表面724和框架底部728之间。钮712被拧紧直到标尺726读出100 lbf的期望力(100 psi被施加到样品)。之后包括样品的整个装置700被置于38°C/90%RH下的环境腔室中24小时或者50°C下的烤箱中24小时。之后从测试环境移除装置700并且将其冷却到室温。之后释放压力并且从装置移除样品。
通过分离每对纸板片材针对粘着性和粘合评估样品。结果报告如下,其中0级别表明没有粘合的倾向:
表3 粘合级别
粘合损坏由于纤维撕裂而是可见的,这如果存在的话通常伴随纤维从样品754的非屏障表面拔起发生。如果非屏障表面涂布有印刷涂层,则也可能由印刷涂层的损坏表明粘合。
例如在如图5中象征性地描绘的,样品752(0)/754(0)可以代表"0"粘合(没有粘合)。样品中的圆形形状表明处于压力下的近似面积,比如整个样品的大约一平方英寸。样品752(3)/754(3)可以代表"3"粘合级别,且处于压力下的面积中高达25%的纤维撕裂,具体地在样品754(3)的未涂布表面中。样品752(4)/754(4)可以代表"4"粘合级别且多于25%的纤维撕裂,具体地在样品754(4)的未涂布表面中。图5中的描绘仅意味着近似建议这样的测试样品的损坏百分比,而不是示出样品的实际外观。
使用AMC Maelstom调浆机测试再浆化性。被切割成1"x1"正方块的110克的涂布纸板被添加到容纳2895克水(pH 6.5±0.5,50°C)的调浆机内,浸泡15分钟,且然后再浆化30分钟。之后通过振动平筛(0.006"槽大小)筛分300 mL的再浆化浆料。排斥物(被筛卡住)和纤维接受物被收集、干燥并称重。基于接受物和排斥物的重量计算接受物的百分比,并且其中100%是完全再浆化。
作为不良再浆化性的示例,测试涂布有低密度聚乙烯(LDPE)的涂层重量为每3000ft2 7-11 lbs下的SBS纸板并且给出在91至97%的范围中的纤维接受物。(纤维接受物百分比接近100%是期望的)。涂布有聚乙烯的纸板不易于可再浆化和再回收。
表2中所示的各种涂层配方作为单层被施加到纸板基体上,并且测试结果在表3中示出,包括3M Kit测试、粘合和可再浆化性。如表4中所示,涂布有单层涂层的纸板不粘合、可完全再浆化,并且在屏障侧上具有在5-10的范围中的3M Kit水平。不过,用单个涂层,即使在更高的涂层重量下,3M Kit测试值仍不会达到11或者12。
表4 用单个涂层的测试结果
表5 用双层涂层的测试结果
接下来,表2中所示的涂层配方作为两层涂层被施加于纸板基体上。结果在表5中示出。在仍然可完全再浆化且不粘合的纸板产品中实现了令人惊讶地良好的屏障性质。针对所述两层涂层使用相同涂层配方或者不同涂层配方中的任一者。当纸板涂布有双层涂层(或者用相同配方或者用不同配方)时,即使在每3000ft2大约10 lbs的总涂层重量的情况下,仍实现3M Kit水平为12的优异的耐油和油脂性。为12的3M Kit水平匹配当前在食品和食品服务包装中广泛使用的聚乙烯挤出涂布纸板。更重要地,高度耐油和油脂的纸板不粘合并且可完全再浆化。
也在屏障涂布侧上用植物油(蓖麻油)测试高达24小时来测试涂布纸板。结果表明对于具有单个涂层的纸板,施加到屏障涂布侧的油在24小时之后在相对侧上表现出透过。不过,对于具有双层涂层的纸板而言,存在优异的油保留,并且相对侧上不可见油玷污或渗透。这确认了具有双层涂层的纸板的优异的耐油和油脂性能。
因此,已经发现,使用常规颜料与仅中间水平的常规粘结剂的涂层,在没有诸如含氟化合物或蜡的通常的屏障材料的情况下,当作为双层涂层施加时,给出优异的耐油和油脂性。此外,在纸板没有趋于粘合的倾向且具有可完全再浆化性的情况下实现这些结果。
进行另一测试以确定是否能够改进本发明的纸板的耐湿性(包括水蒸汽屏障和液体水屏障)。上述测试利用SA(苯乙烯-丙烯酸)粘结剂。现在用SA(苯乙烯丙烯酸)和SBR(苯乙烯-丁二烯橡胶)粘结剂的组合进行测试。表6中给出结果。在每个测试(例如Ctrl 1、Ctrl2、A、B、C、D、E)内,底涂层(BC)和面涂层(TC)使用相同配方(在表格的各列中列出)。不同测试之间,涂层的SA和SBR粘结剂的相对量不同。
表6 用双层涂层的测试结果:耐湿
描述 | Ctrl 1 | A | B | C | D | E | Ctrl2 |
Clay-1 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
CaCO<sub>3</sub>-1 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
SA(份) | 35 | 17.5 | 13.5 | 10 | 10 | 10 | 0 |
SBR(份) | 0 | 17.5 | 21.5 | 25 | 25 | 25 | 25 |
粘结剂/颜料比 | 35/100 | 35/100 | 35/100 | 35/100 | 35/100 | 35/100 | 35/100 |
BC/TC lb/3msf | 9.4/6.2 | 9.3/6.2 | 9.5/5.9 | 9.2/6.2 | 9.2/4.5 | 8.1/5.1 | 9.4/5/7 |
3M Kit(1-12) | 11.6 | 11.6 | 12 | 12 | 12 | 12 | 11.8 |
WVTR gsm/d | 634 | 370 | 387 | 327 | 377 | 367 | 265 |
2-min Cobb gsm | 26.7 | 19.7 | 16.5 | 13.8 | 14.5 | 15.8 | 10.8 |
再浆化接受物% | 100 | 100 | 99.9 | 100 | 100 | 100 | 99.3 |
对照涂层是对照1(如在若干先前测试中所使用的35份SA粘结剂)和对照2(35份SBR粘结剂)。对照1具有最高/最坏的WVTR(在38℃和90%的相对湿度下的水蒸汽透过速率;TAPPI标准T464 OM-12)和水Cobb(TAPPI标准T441 om-04)值。对照2具有最低/最好的WVTR和Cobb值,但是其99.3%的再浆化性不是很好。
对于SA和SBR粘结剂的混合物,在3M Kit值为11.6和12的情况下获得良好的耐油和油脂性,且再浆化性在99.9-100%下是优异的。屏障涂布侧的优异的耐油/油脂性或保留性通过植物油测试被确认,该测试(测试样品A和C)用蓖麻油在24小时的测试时段内在屏障涂布表面上没有示出任何油渗透或玷污。相比于单独使用SA粘结剂,水蒸汽透过速率和两分钟Cobb均被改善(降低)。样品没有表现出趋于粘合的倾向。
测试涂层A-E包括SA和SBR粘结剂的混合物,并且其中总共35份粘结剂包括10-25份的每种粘结剂。具体地,35份粘结剂中的至少10份(28.6%)是苯乙烯丙烯酸粘结剂,并且35份粘结剂中的至少17.5份(50%)是苯乙烯丁二烯橡胶。然而,考虑到在表6中获得的满意结果,在至少25%或至少20%SA,且至少40%或至少35%SBR的情况下可能出现一些耐湿性的改进。
上述测试使用刮刀涂布机来施加底涂层和面涂层二者。如先前所讨论的,可以使用各种类型的涂布装置。表7示出针对底涂层使用计量(薄膜)施胶压榨机和针对面涂层使用刮刀涂布机的双层涂层的测试结果。两种不同的配方(均类似于上文所讨论的那样)被分别用于展示计量施胶压榨机和刮刀涂布机。针对通过计量施胶压榨机和刮刀涂布机所得的双层涂层在为12的3M Kit水平下获得良好的耐油和油脂性。作为比较,通过计量施胶压榨所得的每3000 ft2 7.4 lbs的涂层重量下的单层配方AC-6仅表现出小于1的3M Kit值。在双涂布侧上用蓖麻油测试样品AC-6/AC-1(每3000 ft2 7.4/7.9 lbs)和AC-6/AC-7(每3000ft2 6.4/7.9 lbs)24小时,并且这两种样品均表现出双层涂层的优异的油保留性质。样品AC-6/AC-1(每3000 ft2 7.4/7.9 lbs)在双层涂层上没有表现出任何油渗透或玷污。样品AC-6/AC-7(每3000 ft2 6.4/7.9 lbs)仅表现出在屏障涂布表面上的少量极淡的表面玷污斑点(没有渗透)。样品没有表现出趋于粘合的倾向。
表7 双层涂层:计量(薄膜)施胶压榨机和刮刀涂布机
一旦给出上述公开内容,本领域技术人员将显而易见到许多其他特征、改型或改进。因此,这样的特征、改型或改进被视为本发明的一部分,本发明的范围将由以下权利要求确定。
虽然已经描述且示出了本发明的优选实施例,但是应当显而易见的是,在不脱离本发明的精神或范围的情况下,能够对本发明的实施例和实施方式做出许多改型。因此应当理解的是,本发明不限于本文所公开(或从本公开显而易见到)的具体实施例,而是仅由所附权利要求限制。
Claims (27)
1.一种涂布纸板,包括:
具有第一侧和第二侧的纸板基体;
与所述第一侧接触的底涂层,所述底涂层包括粘结剂和颜料,所述底涂层大体不包含含氟化合物或蜡,其中所述底涂层中粘结剂与颜料之比是按重量每100份颜料25份至40份之间的粘结剂;
与所述底涂层接触的面涂层,所述面涂层包括粘结剂和颜料,所述面涂层大体不包含含氟化合物或蜡,其中所述面涂层中粘结剂与颜料之比是按重量每100份颜料25份至40份之间的粘结剂。
2.根据权利要求1所述的涂布纸板,其中,所述涂布纸板具有至少为10,优选为12的3MKit测试值。
3.根据权利要求1所述的涂布纸板,其中,所述涂布纸板可再浆化至在再浆化之后接受物百分比是至少99%,优选为至少99.9%的程度。
4.根据权利要求1所述的涂布纸板,其中,所述底涂层重量是每3000 ft2 5至12 lbs,优选为每3000 ft2 6至9 lbs。
5.根据权利要求1所述的涂布纸板,其中,所述面涂层重量是每3000 ft2 2至9 lbs,优选为每3000 ft2 3至6 lbs。
6.根据权利要求1所述的涂布纸板,其在100 psi的压力下在50℃下保持24小时之后不具有趋于粘合的倾向。
7.根据权利要求1所述的涂布纸板,其中,所述底涂层中粘结剂与颜料之比是按重量每100份颜料25份至30份之间、或者30份至35份之间、或者35份至40份之间的粘结剂。
8.根据权利要求1所述的涂布纸板,其中,所述面涂层中粘结剂与颜料之比是按重量每100份颜料25份至30份之间、或者30份至35份之间、或者35份至40份之间的粘结剂。
9.根据权利要求1所述的涂布纸板,其中,所述粘结剂包括苯乙烯丙烯酸盐共聚物和苯乙烯-丁二烯共聚物中的至少一种。
10.根据权利要求1所述的涂布纸板,其中,所述颜料包括粘土和碳酸钙中的至少一种。
11.根据权利要求1所述的涂布纸板,其中,所述颜料包括1号超细高岭土。
12.根据权利要求1所述的涂布纸板,其中,所述颜料包括高纵横比的片状粘土。
13.根据权利要求1所述的涂布纸板,其中,所述颜料包括粗磨重质碳酸钙和细磨重质碳酸钙中的至少一种。
14.根据权利要求1所述的涂布纸板,其中,所述涂布纸板具有在38℃以及90%的相对湿度下每天每平方米最多424克,优选为每天每平方米最多400克的水蒸汽透过速率。
15.根据权利要求1所述的涂布纸板,其中,所述涂布纸板具有每平方米最多20克,优选为每平方米最多16克的两分钟Cobb测试。
16.根据权利要求1所述的涂布纸板,其中,所述粘结剂包括苯乙烯丙烯酸盐共聚物(SA)和苯乙烯-丁二烯共聚物(SBR)两种。
17.根据权利要求16所述的涂布纸板,其中,所述粘结剂包括至少28%的SA和至少50%的SBR,优选为至少25%的SA和至少40%的SBR,更优选为至少20%的SA和至少35%的SBR。
18.一种处理纸板的方法,所述方法包括:
提供具有第一侧和第二侧的纸板基体;
向所述第一侧施加底涂层,所述底涂层包括粘结剂和颜料并且大体不包含含氟化合物或蜡,其中所述底涂层中粘结剂与颜料之比是按重量每100份颜料25份至40份之间的粘结剂;
在所述底涂层上施加面涂层,所述面涂层包括粘结剂和颜料,所述面涂层大体不包含含氟化合物或蜡,其中所述面涂层中粘结剂与颜料之比是按重量每100份颜料25份至40份之间的粘结剂。
19.根据权利要求18所述的方法,其中,所述底涂层由选自包括刮刀涂布机、帘式涂布机、气刀涂布机、棒式涂布机、薄膜涂布机、短驻留涂布机、喷涂机和计量薄膜施胶压榨机的集合的装置施加。
20.根据权利要求18所述的方法,其中,所述面涂层由选自包括刮刀涂布机、帘式涂布机、气刀涂布机、棒式涂布机、薄膜涂布机、短驻留涂布机、喷涂机和计量薄膜施胶压榨机的集合的装置施加。
21.根据权利要求18所述的方法,其中,所述底涂层重量是每3000 ft2 5至12 lbs。
22.根据权利要求18所述的方法,其中,所述面涂层重量是每3000 ft2 2至9 lbs。
23.根据权利要求18所述的方法,其中,所述底涂层和所述面涂层中的每一者均包括粘结剂,并且所述底涂层和所述面涂层中的至少一者中的粘结剂包括苯乙烯丙烯酸盐共聚物和苯乙烯-丁二烯共聚物中的至少一种。
24.根据权利要求18所述的方法,其中,所述底涂层和所述面涂层中的每一者均包括颜料,并且所述底涂层和所述面涂层中的至少一者中的颜料包括粘土、碳酸钙、1号超细高岭土、高纵横比的片状粘土、粗磨重质碳酸钙和细磨重质碳酸钙中的至少一种。
25.根据权利要求18所述的方法,其中,所述颜料包括1号超细高岭土。
26.根据权利要求18所述的方法,其中,所述颜料包括高纵横比的片状粘土。
27.根据权利要求18所述的方法,其中,所述颜料包括粗磨重质碳酸钙和细磨重质碳酸钙中的至少一种。
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