CN113668281A - 一种高白度涂布白卡纸及其制备方法 - Google Patents
一种高白度涂布白卡纸及其制备方法 Download PDFInfo
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- CN113668281A CN113668281A CN202110731387.8A CN202110731387A CN113668281A CN 113668281 A CN113668281 A CN 113668281A CN 202110731387 A CN202110731387 A CN 202110731387A CN 113668281 A CN113668281 A CN 113668281A
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Abstract
本发明涉及造纸领域,公开了一种高白度涂布白卡纸及其制备方法,包括原纸及覆盖于其表面的涂布层,原纸包括面纸层、芯纸层以及底纸层,涂布层包括预涂层、面涂层和背涂层,原纸的纸浆包括80‑90份阔叶木浆和10‑20份针叶木浆,纸浆经生物酶法漂白处理而成,预涂层、面涂层和背涂层的涂料均包括颜料、涂层胶黏剂和涂层添加剂,颜料包括85‑95份研磨碳酸钙和5‑15份高岭土,涂层添加剂包括占涂料总重量0.05‑0.10%的荧光增白剂,制备方法包括纸浆制备、上网、压榨除水、初步干燥、机内在线涂布、干燥及后续的压光、卷取、裁切及包装步骤。本发明提供一种使用生物酶法漂白、并使用较少的增白剂来制备高白度涂布白卡纸,所制得的涂布白卡纸白度均在94%以上。
Description
技术领域
本发明涉及造纸技术领域,特别涉及一种高白度涂布白卡纸及其制备方法。
背景技术
涂布白卡纸包括原纸和涂布层,原纸通常包括面纸层、芯纸层和底纸层,在原纸的单面或双面均匀涂布涂料形成涂布层,经压光、烘干、整饰等工序即可制得涂布白卡纸。涂布白卡纸主要用于印制美术印刷品、高档商品的包装纸盒等。
白度(国际上一般称为亮度)是人对纸张的一种视觉效果,出众的白度能给人显目的感觉,更能表现出印刷对比与色彩的鲜艳度,亦受到客户的喜爱,因此白度是衡量涂布白卡纸质量的一项重要指标。涂布白卡纸的白度不但依赖于原纸,还依赖于涂布层的白度和涂布量,因此为了增加白卡纸的白度,一方面在原纸浆料制备中,进行漂白处理,同时加入增白剂,另一方面在涂料中加入增白剂,从而整体提高涂布白卡纸的白度,并避免其返黄。
漂白是通过将木质素脱除以得到高白度纸浆的工序,目前造纸厂使用硫酸盐法进行漂白,这一工序中排出的废水量占废水总量的50%以上,且由于漂白剂与纸浆反应会产生大量的污染物质、甚至是致癌物质,尤其是在使用以含元素氯漂剂为主要漂白化学品的生产流程中所产生的漂白废水中会含有更多的AOX,AOX含有一种二恶英类物质,其毒性相当于氰化钾 (KCN)的1000倍以上,因此使用硫酸盐法的漂白废水难处理、对人体毒性大,且加重了环境污染,因此需要一种新的漂白方法用来处理浆料;而荧光增白剂具有致癌作用,且价格昂贵,其使用一方面会增大生产成本,另一方面其积累至一定剂量危害人体健康,因此需减少其使用量。
发明内容
本发明的目的是提供一种高白度涂布白卡纸及其制备方法,提供一种使用新的漂白方法和较少的增白剂的制备高白度涂布白卡纸的方法以及由此方法制备而来的高白度涂布白卡纸。
本发明的上述技术目的是通过以下技术方案得以实现的:
一种高白度涂布白卡纸,包括原纸及覆盖于其表面的涂布层,所述原纸包括面纸层、芯纸层以及底纸层,所述涂布层包括预涂层、面涂层和背涂层,所述原纸的纸浆包括阔叶木浆和针叶木浆,按质量份配浆,所述针叶木浆为10-20份,所述阔叶木浆为80-90份,所述原纸的纸浆经生物酶法漂白处理而成;
所述预涂层、面涂层和背涂层的涂料均包括颜料、涂层胶黏剂和涂层添加剂,所述颜料包括研磨碳酸钙和高岭土,按质量份配比,所述研磨碳酸钙为85-95份,所述高岭土为5-15 份,所述涂层添加剂包括荧光增白剂,所述荧光增白剂占涂料总重量的0.05-0.10%。
进一步的,所述面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,所述芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆 85份、针叶木硫酸盐浆15份,所述底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份。
进一步的,所述面纸层与芯纸层之间设置有一层衬纸层,所述衬纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85-90份、针叶木硫酸盐浆15-20份。
进一步的,所述面纸层、芯纸层和底纸层还包括阳离子增强淀粉和羧甲基纤维素。
进一步的,所述涂层添加剂还包括无机杀菌剂,所述涂层胶黏剂包括涂布淀粉、丁苯胶乳和羧甲基纤维素,按质量份配比:涂布淀粉3份、丁苯胶乳7份和羧甲基纤维素10份,所述涂层胶黏剂占所述涂料总量的比例低于16%。
进一步的,所述颜料质量的粒度为2μm。
一种制备如上述的高白度涂布白卡纸的方法,包括以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.20﹪~0.40﹪,酶处理条件为:本色浆的浓度为7﹪~9﹪,温度50℃~55℃、pH 6.0~8.0、酶解时间40分钟~50分钟,重复三次生物酶法漂白过程,之后按比例进行配浆,并加入填料及纸浆添加剂,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为350-450m/min,得到复合浆料,三种浆料复合后的整体厚度为180-330 μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为650-700kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用如权利要求1-5任一项所述预涂层、面涂层和背涂层的涂料对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
进一步的,所述步骤S1中的所述复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,所述复合酶液中碱性果胶酶的活力为800u/ml~1300u/ml,木聚糖酶的活力为1500u/ml~2000u/ml,甘露聚糖酶的活力为400u/ml~800u/ml,木质素酶的活力为 30u/ml~120u/ml,。
进一步的,在所述步骤S2中,每层浆料间均喷淋淀粉,喷淋淀粉的量为1.5-3.5g/m2。
进一步的,在所述步骤S4之前所述步骤S3之后在湿纸基层两个面进行表面施胶,表面施胶所使用的是淀粉溶液,施胶淀粉溶液的浓度在10%~11%,施胶温度在60-65℃,淀粉涂布量为1.5-3.5g/m2,所述淀粉溶液的制备过程为:先将淀粉按质量浓度为20-22%的浓度溶解于水中,通过蒸煮器蒸煮,蒸煮的温度为95-100℃,蒸煮时间25-28min,蒸煮后的淀粉溶液用冷水稀释到8-13%。
进一步的,所述步骤S5中对卡纸基层正面采用陶瓷耐磨刮刀进行二次涂布后形成预涂层、面涂层,对卡纸基层背面采用计量棒进行涂布后形成背涂层,所述预涂层和面涂层的涂布量为3-9g/m2,所述背涂层的涂布量为4-12g/m2。
与现有技术相比,本发明的有益效果是:
1.本发明使用生物酶法对纸浆进行漂白处理,使用碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂复配而成的复合酶液,酶系全、漂白效果好,在降解针叶木浆和阔叶木浆中残余的木质素提高白度的同时,可对纸浆内纤维素进行较大程度的保留,不产生使用含元素氯漂剂漂白时其与纸浆反应生产的大量的污染物质、致癌物质以及高毒性的AOX,漂白后产生的废水对人体危害减小,治理难度降低,更为环保;在复合酶液中添加了白度稳定剂,促进漂白的同时可有效提高白度并防止纸浆返黄,且在面纸层使用化学机械木浆,芯纸层和底纸层使用硫酸盐浆(化学浆),化学机械木浆具有生产过程相对简单、成本低、得率高、污染小,成纸适印性能好,且自身松厚度、平滑度、不透明度等显著优于化学浆、成纸强度及白度高于机械浆的优点,由此制得的面纸层利于获得高品质的用于涂布的原纸;
2.本发明预涂层、面涂层和背涂层的涂料中使用的颜料是高岭土和研磨碳酸钙(GCC),高岭土白度适宜,光泽度高,而有研究表明:随着预涂涂料中GCC比例的增加,涂布纸的白度升高,光泽度降低,粗糙度升高,所以在面涂层的涂料中适当增大GCC的使用比例,在增大白度的同时,与高岭土协同使用克服GCC对于光泽度的负面影响;并且在面纸层与芯纸层之间设置有一层衬纸层,可提高纸面的平滑度;同时控制颜料的粒度为2μm,使颜料与胶黏剂充分结合,从而使涂布后的白卡纸颜色均匀、光泽度高;并且在浆料上网工序中,每层浆料间均喷淋有淀粉,可提高每层纸浆的结合强度和成纸的挺度,并控制其使用量,避免其过量使用造成湿部压花和粘辊,网部滤水差影响纸机车速。
3.本发明面纸层、芯纸层和底纸层还包括阳离子增强淀粉和羧甲基纤维素,不但可以提高纸的强度、抗水性能以及耐折性能,同时可阻止涂料中的胶黏剂向纸张内;预涂层、面涂层和背涂层的涂料中的涂层胶黏剂中包括涂布淀粉、丁苯胶乳和羧甲基纤维素(CMC),可调整涂料的黏度与流动性并改善涂料的保水性能,同时CMC可作为保水剂,可阻止淀粉和荧光增白剂的迁移,同时CMC还是荧光增白剂的一种优良载体,可提高荧光增白剂增白效果和光学稳定性,并且涂布淀粉在涂料中与丁苯胶乳和羧甲基纤维素作为复合胶黏剂对颜料的结合作出贡献,将颜料黏结到原纸上以及使颜料粒子相互黏结,并防止颜料沉淀并维持其处于均一的分散状态,使产品的白度稳定且不易返黄;并在压榨除水后使用淀粉溶液进行表面施胶,提高原纸抗拒流体渗透的性能、表面强度(IGT)、平滑度和层间结合强度等,同时也会影响纸板的透气度,而采用较高的上胶温度(60℃-65℃),纸页的表面强度上升,而且纸页表面施胶后干燥较快,有利于减少后续烘缸干燥的能耗;淀粉为一种常见的水溶性生物胶乳,价格低廉,本发明使用淀粉与丁苯胶乳和/或羧甲基纤维素(CMC)组成复合胶黏剂进行协同作用,克服了网状结构的淀粉单独使用时其成膜性、粘结强度低于丁苯胶乳的缺点,并在纸浆内、预涂层、面涂层和背涂层的涂料中以及在压榨除水后广泛使用,淀粉使用率高但其涂布效果并未受到影响,另一方面最大程度的降低其他昂贵的胶黏剂的量,节约生产成本,且更为环保。
4.本发明仅在涂布层均加入荧光增白剂,荧光增白剂占涂料总重量的0.05-0.10%,相比于一般的用量减少了40-60%,并通过多重施胶,抑制原纸的返黄,并使涂布纸的白度提高到 94%以上,选用质量好的纯度高的液体荧光增白剂,避免使用纯度差的液体增白剂造成不必要的浪费和返黄;同时加入无机杀菌剂,使其具备抗菌功能,防止白卡纸上滋生细菌而使白卡纸成不均匀的斑驳状态而影响白卡纸整体的均匀度;本发明所制得的高白度涂布白卡纸,白度高、不易返黄,挺度大、平滑度以及耐折度良好,产品质量高且稳定,并且成本低,适于企业推广使用。
具体实施方式
下面将结合具体实施例对本发明的技术方案进行清楚、完整地描述。显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
本发明提供的一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,复合酶液中碱性果胶酶的活力为1300u/ml,木聚糖酶的活力为2000u/ml,甘露聚糖酶的活力为800u/ml,木质素酶的活力为120u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.40﹪,酶处理条件为:本色浆的浓度为9﹪,温度55℃、pH8.0、酶解时间50分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(其中面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份,面纸层与芯纸层之间设置有一层衬纸层,衬纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份),并加入填料,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为450m/min,得到复合浆料,三种浆料复合后的整体厚度为330μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为700kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、丁苯胶乳、荧光增白剂,其中,荧光增白剂占涂料总重量的0.10%,丁苯胶乳占涂料总重量的15%,颜料包括研磨碳酸钙85份,高岭土15份)对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
实施例2
一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,复合酶液中碱性果胶酶的活力为800u/ml,木聚糖酶的活力为1500u/ml,甘露聚糖酶的活力为400u/ml,木质素酶的活力为30u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.20﹪,酶处理条件为:本色浆的浓度为7﹪,温度50℃、pH 6.0、酶解时间40分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份),并加入填料、阳离子增强淀粉和羧甲基纤维素,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为350m/min,得到复合浆料,三种浆料复合后的整体厚度为180μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为650kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、丁苯胶乳、荧光增白剂,其中,荧光增白剂占涂料总重量的0.10%,丁苯胶乳占涂料总重量的15%,颜料包括研磨碳酸钙85份,高岭土15份)对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
实施例3
一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,复合酶液中碱性果胶酶的活力为1000u/ml,木聚糖酶的活力为1800u/ml,甘露聚糖酶的活力为600u/ml,木质素酶的活力为80u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.30﹪,酶处理条件为:本色浆的浓度为8﹪,温度52℃、pH7.0、酶解时间45分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份),并加入填料,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为400m/min,得到复合浆料,三种浆料复合后的整体厚度为250μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为680kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、涂层胶黏剂、荧光增白剂和无机杀菌剂,其中,荧光增白剂占涂料总重量的0.06%,颜料包括研磨碳酸钙85 份,高岭土15份,涂层胶黏剂包括涂布淀粉、丁苯胶乳和羧甲基纤维素,按质量份配比:涂布淀粉3份、丁苯胶乳7份和羧甲基纤维素10份,涂层胶黏剂占所述涂料总量的比例为15%) 对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
实施例4
本发明提供的一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,复合酶液中碱性果胶酶的活力为900u/ml,木聚糖酶的活力为1700u/ml,甘露聚糖酶的活力为500u/ml,木质素酶的活力为100u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.25﹪,酶处理条件为:本色浆的浓度为8﹪,温度50℃、pH 6.0、酶解时间50分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,所述芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,所述底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份),并加入填料,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为400m/min,得到复合浆料,三种浆料复合后的整体厚度为200μm,每层浆料间均喷淋淀粉,喷淋淀粉的量为2.0g/m2;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为700kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、丁苯胶乳、荧光增白剂,其中,荧光增白剂占涂料总重量的0.07%,丁苯胶乳占涂料总重量的15%,颜料包括研磨碳酸钙85份,高岭土15份)对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
实施例5
本发明提供的一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,复合酶液中碱性果胶酶的活力为1100u/ml,木聚糖酶的活力为1900u/ml,甘露聚糖酶的活力为700u/ml,木质素酶的活力为70u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.35﹪,酶处理条件为:本色浆的浓度为9﹪,温度55℃、pH 8.0、酶解时间40分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份),并加入填料,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为450m/min,得到复合浆料,三种浆料复合后的整体厚度为230μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为650-700kN/m,制得湿纸基层,在湿纸基层两个面进行表面施胶,表面施胶所使用的是淀粉溶液,施胶淀粉溶液的浓度在10%,施胶温度在60℃,淀粉涂布量为2.5g/m2,所述淀粉溶液的制备过程为:先将淀粉按质量浓度为20%的浓度溶解于水中,通过蒸煮器蒸煮,蒸煮的温度为95℃,蒸煮时间25min,蒸煮后的淀粉溶液用冷水稀释到8%;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、丁苯胶乳、荧光增白剂,其中,荧光增白剂占涂料总重量的0.08%,丁苯胶乳占涂料总重量的15%,颜料包括研磨碳酸钙85份,高岭土15份)对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
实施例6
本发明提供的一种高白度涂布白卡纸的制备方法,按以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液(复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,所述复合酶液中碱性果胶酶的活力为1300u/ml,木聚糖酶的活力为2000u/ml,甘露聚糖酶的活力为800u/ml,木质素酶的活力为120u/ml)通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.40﹪,酶处理条件为:本色浆的浓度为9﹪,温度55℃、pH 8.0、酶解时间50分钟,重复三次生物酶法漂白过程,之后按比例进行配浆(面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份,面纸层与芯纸层之间设置有一层衬纸层,衬纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份),并加入填料、阳离子增强淀粉和羧甲基纤维素,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为450m/min,得到复合浆料,三种浆料复合后的整体厚度为250μm,每层浆料间均喷淋淀粉,喷淋淀粉的量为2.5g/m2;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为700kN/m,制得湿纸基层,在湿纸基层两个面进行表面施胶,表面施胶所使用的是淀粉溶液,施胶淀粉溶液的浓度在11%,施胶温度在65℃,淀粉涂布量为2.5g/m2,所述淀粉溶液的制备过程为:先将淀粉按质量浓度为20%的浓度溶解于水中,通过蒸煮器蒸煮,蒸煮的温度为95℃,蒸煮时间25min,蒸煮后的淀粉溶液用冷水稀释到10%;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用预涂层、面涂层和背涂层的涂料(包括颜料、涂层胶黏剂、荧光增白剂和无机杀菌剂,其中,荧光增白剂占涂料总重量的0.09%,颜料包括研磨碳酸钙85 份,高岭土15份,涂层胶黏剂包括涂布淀粉、丁苯胶乳和羧甲基纤维素,按质量份配比:涂布淀粉3份、丁苯胶乳7份和羧甲基纤维素10份,所述涂层胶黏剂占所述涂料总量的比例为 15%)对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
测定实施例1-6制得的高白度涂布白卡纸与市售普通白卡纸(产品名称:涂布白卡纸,规格230g/m2,骄阳牌)各项物理指标的比较,结果见表1。由表可见,高白度涂布白卡纸的白度高,均在94%以上,挺度、平滑度以及耐折度与对比例相比差别不大,说明本发明的制备方法可制得一种白度在94%以上、其他性能不差于市售普通白卡纸的高白度涂布白卡纸。
表1高白度涂布白卡纸与市售普通涂布白卡纸各项物理指标对比
需要说明的是:以下实施例中所有原料均为市售产品,均属于造纸用化学品,除特殊说明外,标明功能的成分均具有造纸领域的普遍性,不具有特殊性,均为本领域公知技术,故没有列出详细信息,但均不会影响本发明的实施性。以下实施例涉及白度(又称亮度)均为 GB/T 7974-2002中定义的白度,检测方法同国标中的记载,无特殊含义,所使用的装置均为本领域常用装置,无特殊要求,没有列出详细信息,但均不会影响本发明的实施性,无特殊含义。
上述描述仅是对本发明较佳实施例的描述,并非对本发明范围的任何限定,本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰,均属于权利要求书的保护范围。
Claims (11)
1.一种高白度涂布白卡纸,包括原纸及覆盖于其表面的涂布层,所述原纸包括面纸层、芯纸层以及底纸层,所述涂布层包括预涂层、面涂层和背涂层,其特征在于:所述原纸的纸浆包括阔叶木浆和针叶木浆,按质量份配浆,所述针叶木浆为10-20份,所述阔叶木浆为80-90份,所述原纸的纸浆经生物酶法漂白处理而成;
所述预涂层、面涂层和背涂层的涂料均包括颜料、涂层胶黏剂和涂层添加剂,所述颜料包括研磨碳酸钙和高岭土,按质量份配比,所述研磨碳酸钙为85-95份,所述高岭土为5-15份,所述涂层添加剂包括荧光增白剂,所述荧光增白剂占涂料总重量的0.05-0.10%。
2.根据权利要求1所述的一种高白度涂布白卡纸,其特征在于:所述面纸层的纸浆由以下质量份的组分进行配浆:阔叶木化学机械浆80份和针叶木化学机械浆20份,所述芯纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85份、针叶木硫酸盐浆15份,所述底纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆90份和针叶木硫酸盐浆10份。
3.根据权利要求1所述的一种高白度涂布白卡纸,其特征在于:所述面纸层与芯纸层之间设置有一层衬纸层,所述衬纸层的纸浆由以下质量份的组分进行配浆:阔叶木硫酸盐浆85-90份、针叶木硫酸盐浆15-20份。
4.根据权利要求1所述的一种高白度涂布白卡纸,其特征在于:所述面纸层、芯纸层和底纸层还包括阳离子增强淀粉和羧甲基纤维素。
5.根据权利要求1所述的一种高白度涂布白卡纸,其特征在于:所述涂层添加剂还包括无机杀菌剂,所述涂层胶黏剂包括涂布淀粉、丁苯胶乳和羧甲基纤维素,按质量份配比:涂布淀粉3份、丁苯胶乳7份和羧甲基纤维素10份,所述涂层胶黏剂占所述涂料总量的比例低于16%。
6.根据权利要求1所述的一种高白度涂布白卡纸,其特征在于:所述颜料质量的粒度为2μm。
7.一种制备如权利要求1-6任一项所述的高白度涂布白卡纸的方法,其特征在于:包括以下步骤:
S1,纸浆制备:将针叶木和阔叶木经备料、制浆、洗涤、筛选后制成本色浆,之后进行生物酶法漂白:将复合酶液通过计量泵加入本色浆中,使其与本色浆混合均匀进行酶解反应,复合酶液的添加量与绝干本色浆的质量百分比为0.20﹪~0.40﹪,酶处理条件为:本色浆的浓度为7﹪~9﹪,温度50℃~55℃、pH 6.0~8.0、酶解时间40分钟~50分钟,重复三次生物酶法漂白过程,之后按比例进行配浆,并加入填料及纸浆添加剂,分别制得面纸层浆料、芯纸层浆料以及底纸层浆料;
S2,上网:将步骤S1制得的面纸层浆料、芯纸层浆料和底纸层浆料经滤水、复合,复合过程中上网的速度为350-450m/min,得到复合浆料,三种浆料复合后的整体厚度为180-330μm;
S3,压榨除水:将步骤S2制备的复合浆料使用两道压榨辊进行压榨出水,压力为650-700kN/m,制得湿纸基层;
S4,初步干燥:将步骤S3经压榨出水的使用多组烘缸进行干燥,干燥的温度呈梯度上升,具体过程为:20-45℃保持30min,45-75℃保持25-30min,85-110℃保持10-15min,温度依次从50℃上升到120℃,至浆料中水分含量为8-10%,得到卡纸基层;
S5,机内在线涂布:使用如权利要求1-5任一项所述预涂层、面涂层和背涂层的涂料对步骤S4制得的卡纸基层进行在线涂布;
S6,再次干燥:将步骤S5经涂布的卡纸基层进行红外或热风干燥;
S7,之后经压光、卷取、裁切及包装得到高白度涂布白卡纸。
8.根据权利要求7所述的一种高白度涂布白卡纸的制备方法,其特征在于:所述步骤S1中的所述复合酶液包括碱性果胶酶、木聚糖酶、甘露聚糖酶、木质素酶和白度稳定剂,所述复合酶液中碱性果胶酶的活力为800u/ml~1300u/ml,木聚糖酶的活力为1500u/ml~2000u/ml,甘露聚糖酶的活力为400u/ml~800u/ml,木质素酶的活力为30u/ml~120u/ml。
9.根据权利要求7所述的一种高白度涂布白卡纸的制备方法,其特征在于:在所述步骤S2中,每层浆料间均喷淋淀粉,喷淋淀粉的量为1.5-3.5g/m2。
10.根据权利要求7所述的一种高白度涂布白卡纸及制备方法,其特征在于:在所述步骤S4之前所述步骤S3之后在湿纸基层两个面进行表面施胶,表面施胶所使用的是淀粉溶液,施胶淀粉溶液的浓度在10%~11%,施胶温度在60-65℃,淀粉涂布量为1.5-3.5g/m2,所述淀粉溶液的制备过程为:先将淀粉按质量浓度为20-22%的浓度溶解于水中,通过蒸煮器蒸煮,蒸煮的温度为95-100℃,蒸煮时间25-28min,蒸煮后的淀粉溶液用冷水稀释到8-13%。
11.根据权利要求7所述的一种高白度涂布白卡纸及制备方法,其特征在于:所述步骤S5中对卡纸基层正面采用陶瓷耐磨刮刀进行二次涂布后形成预涂层、面涂层,对卡纸基层背面采用计量棒进行涂布后形成背涂层,所述预涂层和面涂层的涂布量为3-9g/m2,所述背涂层的涂布量为4-12g/m2。
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