CN115434187B - 一种非造纸过程染色生产透芯专色涂布卡纸的方法 - Google Patents

一种非造纸过程染色生产透芯专色涂布卡纸的方法 Download PDF

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CN115434187B
CN115434187B CN202211061770.8A CN202211061770A CN115434187B CN 115434187 B CN115434187 B CN 115434187B CN 202211061770 A CN202211061770 A CN 202211061770A CN 115434187 B CN115434187 B CN 115434187B
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吴建平
邵波
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Zhejiang Jinghua New Material Technology Co ltd
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Abstract

本发明公开了一种非造纸过程染色生产透芯专色涂布卡纸的方法，包括以下步骤：(a)对基纸底层进行激光打孔处理，并控制微孔不穿透基纸底层；(b)将浸渍层涂料涂布于激光打孔后的基纸底层外表面；(c)以浸渍层涂料涂层朝上的状态，将基纸通过涂布机的渗透通道，使浸渍层涂料通过微孔充分浸渍基纸底层及基纸芯层，再经干燥处理，完成浸渍层的制备。本发明卡纸浸渍层利用单面渗透技术制得，实现卡纸透芯涂布染色的同时，维持了卡纸本身的物理指标性能，并能够满足更高要求的包装需求，适用于随时小批量无污染生产，大幅降低生产成本，解决了传统造纸厂染色生产污染大的问题。

Description

一种非造纸过程染色生产透芯专色涂布卡纸的方法
技术领域
本发明涉及纸张再加工技术领域，特别是涉及一种非造纸过程染色生产透芯专色涂布卡纸的方法。
背景技术
目前市面上透芯卡纸的染色方法多采用染缸浸渍染色法或在造纸过程中结合浆内染色与涂布的方法。烟草等高档食品类包装所用的包装纸还需要在卡纸涂布面进行镭射复合转移，使包装纸具有新颖、亮丽、炫彩的外观效果及防伪功能，由于染缸浸渍染色法制备的卡纸表面有细小颜料颗粒，在以该类卡纸为包装材料进行镭射复合转移过程中，将会导致转移膜与卡纸涂布面之间胶水粘合牢度较差，揭起转移膜后纸张表面会出现小白点(即离点)，影响产品质量，此外采用染缸浸渍染色法染色的纸张纤维内残留的油性溶剂使得纸中VOC难以达到食品包装卫生安全要求(染缸染色只能采用油性溶剂，用水会使纸张纤维膨胀而影响纸张平整度)，因此染缸浸渍染色法染色的卡纸不能用于食品类产品包装。事实上，目前烟草等食品类包装多是采用利用在造纸过程中进行浆内染色和涂布方法制造的卡纸作为包装材料，然而在造纸过程的制浆阶段，需要分层分浆种进行染色，染料用量大，造纸后会产生大量废水，处理困难，造成极大的环境污染，并且在生产染色透芯卡纸时只能选择集中大批量生产，这是由于造纸厂采用的是完整的大型全链条生产线设备，每更换一批次不同颜色的生产时间长、损耗大、成本高，这种无法随用随生产的模式并不适合小批量生产，而烟草等高档食品类包装往往很多是小批量订单。
发明内容
本发明的目的在于克服上述现有技术的不足，提供一种非造纸过程染色生产透芯专色涂布卡纸的方法，卡纸浸渍层利用单面渗透技术制得，实现卡纸透芯涂布染色的同时，维持了卡纸本身的物理指标性能，能够满足更高要求的包装需求，适用于随时小批量无污染生产，大幅降低了生产成本，解决了传统造纸厂染色生产污染大的问题。
为了实现上述目的，本发明采用如下技术方案：
一种非造纸过程染色生产透芯专色涂布卡纸的方法，包括以下步骤：
(a)对基纸底层进行激光打孔处理，并控制微孔不穿透基纸底层；
(b)将浸渍层涂料涂布于激光打孔后的基纸底层外表面；
(c)以浸渍层涂料涂层朝上的状态，将基纸通过涂布机的渗透通道，使浸渍层涂料通过微孔充分浸渍基纸底层及基纸芯层，再经干燥处理，完成浸渍层的制备，即可。
基纸底层包括底层本体及涂布于底层本体表面的底面层，底面层为施胶层或底面涂层，通过激光打孔使底面层上形成密集微孔，浸渍层涂料涂布于底面层外表面。
步骤(a)中，采用放送机输送基纸至激光微孔机进行打孔，放送机的张力控制在43-56N，进纸速率为100-200m/min。
步骤(a)中，微孔孔径为10-20nm，深度为7-10μm，分布密度为3-5万个/cm2；激光打孔的电压为380V，电流为20-40A。
按质量百分含量计，浸渍层涂料包括20.1-34％的染料、1.5-7％的渗透剂、31.5-62.5％的有机溶剂、9.8-25.6％的纳米色浆，余量为水；基纸芯层与基纸底层为内外设置，涂布浸渍有浸渍层涂料的基纸底层和基纸芯层构成浸渍层。
所述染料选自水性染料、油溶染料、醇水染料、醇溶染料中的一种或多种，所述有机溶剂选自醇、酯中的一种或多种，所述纳米色浆选自水性纳米色浆、油性纳米色浆、醇溶性纳米色浆中的一种或多种。纳米色浆与染料颜色属同色系。
水性染料为能溶于水的染料，包括直接黑19、食用黑2、酸性红27、酸性红52、酸性红87、酸性兰9、活性红195、直接蓝289、直接蓝291、溶剂绿7、酸性黄23、酸性黄17、酸性黄104、直接黄86、直接黄108、直接黄142、碱性黄40、食品黄5等。
油溶染料指可溶于脂肪烃、碳氢化合物和弱极性溶剂的染料，包括溶剂紫13、溶剂红23、溶剂红138、溶剂红111、溶剂红168、溶剂橙60、油溶蓝60、油溶蓝129、油溶蓝BSN、油溶蓝90、油溶兰623、油溶橙210、油溶黄102、油溶黄179、油溶黑840、油溶黑805、油溶红310、油溶黄3G等。
醇水染料为既能溶于水又能溶于醇类有机溶剂的染料，也称为水油两性(醇溶性)染料，包括碱性玫瑰精、孔雀石绿、结晶紫、酸性蓝9、碱性湖蓝BB、碱性嫩黄O等。
醇溶染料为溶于乙醇或其他类似的有机溶剂而不溶于水的染料，包括溶剂黑46、碱性艳蓝B、碱性红12、酸性黄36、溶剂蓝38、溶剂蓝36、溶剂紫8等。
渗透剂包括渗透剂OEP-70、渗透剂AEP、渗透剂JFC、渗透剂JFC-E等。有机溶剂为乙醇、乙酸乙酯、乙酸丁酯、正丁醇中的一种或多种。醇溶性纳米色浆为由既能溶于水又能溶于醇类有机溶剂的纳米色浆，也可称为水油两用(醇溶性)纳米色浆。
步骤(b)中，浸渍层涂料的涂布速率为70-100m/min，涂布量为15-30g/m2。
步骤(c)中，渗透通道内通入冷风，风压为750mmHg，风温为25℃；基纸通过渗透通道的速率为30-60m/min，通过渗透通道的时间为3-6s；干燥风速为1.5-2m/s，干燥温度为60℃、80℃、105℃、105℃、90℃。
浸渍层表面还可涂布一层补色层，浸渍层表面还可涂布一层补色层，涂布量为25-35g/m2。补色层涂料与浸渍层涂料颜色属于同色系。
按质量百分含量计，补色层5涂料包括40.6-51.8％的色浆、27.7-39.9％的胶黏剂、0.5-2.3％的分散剂、6-10.4％的聚乙烯醇缩丁醛、6-10.5％的丙烯酸树脂、0.2-1.9％的消泡剂、0.5-1.7％的流平剂、0.9-1.8％的增稠剂。
所述补色层5中色浆为水性染料色浆、油性染料色浆中的任意一种；所述胶黏剂为聚乙烯醇胶黏剂、丁苯乳液胶黏剂、丙苯乳液胶黏剂、丙烯酸乳液胶黏剂中的至少两种；所述分散剂为分散剂NNO、BYK170、BYK180、BYK2000、BYK2008中的任意一种；所述消泡剂为炔二醇消泡剂、有机硅消泡剂、聚醚消泡剂中的任意一种；所述流平剂为聚二甲基硅氧烷流平剂、聚甲基苯基硅氧烷流平剂、聚醚改性硅氧烷流平剂中的任意一种；所述增稠剂为羧甲基纤维素钠、聚丙烯酸钠中的一种。
本发明的有益效果是：本发明方法完全区别于传统造纸厂染色生产透芯卡纸的方法，通过浸渍层涂料的合理配置，通过对普通基纸底层外表面施胶层或底面涂层的激光打孔处理，使浸渍层涂料充分渗透至基纸底层本体与基纸芯层，即利用单面渗透技术、采用普通小型涂布设备就是实现卡纸的透芯涂布染色生产，不仅不会改变基纸的本身的物理指标性能，能够满足更高要求的包装需求，特别是高档烟草包装的需求，而且可以随时进行小批量生产，大幅降低生产成本，解决了传统造纸厂染色生产污染大的问题。
附图说明
图1为本发明所制备卡纸的结构图。
图中：基纸底层1、底层本体11、底面层12、基纸芯层2、基纸面层3、印刷涂层4、补色层5。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步描述：
实施例1
(a)采用放送机输送基纸至激光微孔机，放送机的张力控制在50N，进纸速率为120m/min；
通过激光微孔机对基纸底层1进行激光打孔处理，并控制微孔不穿透基纸底层1；如图1所示，基纸包括由下而上依次叠置的基纸底层1、基纸芯层2、基纸面层3和印刷涂层4，基纸底层1包括底层本体11及涂布于底层本体11表面的底面层12，底层本体11叠置在基纸芯层2下，底面层12为施胶层或底面涂层，通过激光打孔使底面层12上形成密集微孔，浸渍层涂料涂布于底面层12外表面；微孔孔径为10-15nm，深度为8μm，分布密度为3万个/cm2，激光打孔的电压为380V，电流为30A；微孔只破坏底面层12的结构而不破坏其他结构层，既能保证浸渍层涂料的有效渗透，又能保证卡纸产品的最终物理指标性能；
(b)通过涂布机将浸渍层涂料涂布于激光打孔后的基纸底层1外表面(即底面层12外表面)；浸渍层涂料的涂布速率为80m/min，涂布量为20g/m2；
按质量百分含量计，浸渍层涂料包括14％的油溶染料(油溶黑840)、9％的醇溶染料(溶剂黑46)、1.5％的渗透剂(渗透剂JFC)、13.5％的乙醇、12.6％的乙酸乙酯、5.4％的乙酸丁酯、3.6％的正丁醇、15.2％的油性纳米色浆、10.4％的醇溶性纳米色浆，余量为水；基纸芯层2与基纸底层1为内外设置，涂布浸渍有浸渍层涂料的基纸底层1和基纸芯层2构成浸渍层。水性纳米色浆、油性纳米色浆、醇溶性纳米色浆均为黑色纳米色浆。
(c)以浸渍层涂料涂层朝上的状态，将基纸通过涂布机的渗透通道，使浸渍层涂料通过微孔充分浸渍基纸底层1及基纸芯层2，基纸通过渗透通道的速率为40m/min，通过渗透通道的时间为5s，渗透通道内通入冷风，风压为750mmHg，风温为25℃；然后送入涂布机的干燥通道中进行干燥，完成浸渍层的制备，即可；干燥风速为1.5m/s，干燥温度为60℃、80℃、105℃、105℃、90℃。
实施例2-10
按实施例1的方法制备卡纸，各实施例浸渍层涂料具体配比如表1所示(染料与纳米色浆颜色属同色系)，各实施例具体工艺参数如表2所示。
表1
Figure BDA0003826517510000041
Figure BDA0003826517510000051
表2
Figure BDA0003826517510000052
分别对实施例1-10制得的卡纸与基纸性能进行测试，结果如表3所示。
表3
Figure BDA0003826517510000053
/>
Figure BDA0003826517510000061
实施例11
为使卡纸表面更平滑并具有光泽性，浸渍层表面还可涂布一层补色层5，补色层5涂料与浸渍层涂料颜色属于同色系。具体过程为：取实施例1制备的涂覆浸渍层的卡纸，将补色层涂料涂布于浸渍层表面，控制涂布量为30g/m2，然后送入干燥通道进行干燥，干燥风速为1m/s，干燥温度为80℃、80℃、90℃、100℃、90℃；按质量百分含量计，按质量百分含量计，补色层5涂料包括50.7％的黑色油性染料色浆(与浸渍层涂料颜色属同色系)、6.6％的聚乙烯醇胶黏剂、9.3％的丁苯乳液胶黏剂、6.1％的丙苯乳液胶黏剂、5.7％的丙烯酸乳液胶黏剂、0.6％的分散剂(分散剂NNO)、10.4％的聚乙烯醇缩丁醛、9％的丙烯酸树脂、0.2％的消泡剂(有机硅消泡剂)、0.5％的流平剂(聚二甲基硅氧烷流平剂)、0.9％的增稠剂(羧甲基纤维素钠)。
实施例12-20
分别取实施例2-10制备的涂覆浸渍层的卡纸(实施例12采用实施例2制备的卡纸，实施例13采用实施例3制备的卡纸，依次类推)，按照实施例11的方法制备涂布有补色层的卡纸，各实施例补色层5涂料具体配比如表4所示(补色层5涂料颜色与浸渍层涂料颜色属同色系)，各实施例补色层5制备工艺参数如表5所示。
表4
Figure BDA0003826517510000062
/>
Figure BDA0003826517510000071
表5
Figure BDA0003826517510000072
分别对实施例11-20制得的卡纸进行测试，结果发现实施例11-20制备的含补色层卡纸色差值△E依次为0.15、0.20、0.145、0.21、0.17、0.156、0.149、0.12、0.12、0.13，平滑度平均提升10.24％，耐破度、横向挺度、纵向挺度、耐折度基本不变。
分别对实施例1-10、11-20的卡纸进行VOC检测，均符合食品包装的安全卫生要求。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (7)

1.一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：包括以下步骤：
(a)对基纸底层(1)进行激光打孔处理，并控制微孔不穿透基纸底层(1)；微孔孔径为10-20nm，深度为7-10μm，分布密度为3-5万个/cm2；激光打孔的电压为380V，电流为20-40A；
基纸底层(1)包括底层本体(11)及涂布于底层本体(11)表面的底面层(12)，底面层(12)为施胶层或底面涂层，通过激光打孔使底面层(12)上形成密集微孔，浸渍层涂料涂布于底面层(12)外表面；
(b)将浸渍层涂料涂布于激光打孔后的基纸底层(1)外表面；按质量百分含量计，浸渍层涂料包括20.1-34％的染料、1.5-7％的渗透剂、31.5-62.5％的有机溶剂、9.8-25.6％的纳米色浆，余量为水；基纸芯层(2)与基纸底层(1)为内外设置，涂布浸渍有浸渍层涂料的基纸底层(1)和基纸芯层(2)构成浸渍层；
(c)以浸渍层涂料涂层朝上的状态，将基纸通过涂布机的渗透通道，使浸渍层涂料通过微孔充分浸渍基纸底层(1)及基纸芯层(2)，再经干燥处理，完成浸渍层的制备，即可。
2.如权利要求1所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：步骤(a)中，采用放送机输送基纸至激光微孔机进行打孔，放送机的张力控制在43-56N，进纸速率为100-200m/min。
3.如权利要求1所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：所述染料选自水性染料、油溶染料、醇水染料、醇溶染料中的一种或多种，所述有机溶剂选自醇、酯中的一种或多种，所述纳米色浆选自水性纳米色浆、油性纳米色浆、醇溶性纳米色浆中的一种或多种。
4.如权利要求1所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：步骤(b)中，浸渍层涂料的涂布速率为70-100m/min，涂布量为15-30g/m2。
5.如权利要求1所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：步骤(c)中，渗透通道内通入冷风，风压为750mmHg，风温为25℃；基纸通过渗透通道的速率为30-60m/min，通过渗透通道的时间为3-6s；干燥风速为1.5-2m/s，干燥温度为60℃、80℃、105℃、105℃、90℃。
6.如权利要求1所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：浸渍层表面还可涂布一层补色层(5)，浸渍层表面还可涂布一层补色层(5)，涂布量为25-35g/m2。
7.如权利要求6所述一种非造纸过程染色生产透芯专色涂布卡纸的方法，其特征在于：按质量百分含量计，补色层(5)涂料包括40.6-51.8％的色浆、27.7-39.9％的胶黏剂、0.5-2.3％的分散剂、6-10.4％的聚乙烯醇缩丁醛、6-10.5％的丙烯酸树脂、0.2-1.9％的消泡剂、0.5-2.8％的流平剂、0.9-1.8％的增稠剂。
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