CN116043612A - 一种高白度的涂布白卡纸及其制备方法 - Google Patents
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Abstract
本发明公开了一种高白度的涂布白卡纸及其制备方法,涂布白卡纸由上往下包括面涂层、原纸层和底涂层,原纸层由上往下包括面层、芯层和底层,面涂层和底涂层的配方中包括涂料、四磺酸荧光增白剂、颜料蓝和颜料紫,面层的配方中包括面浆、二磺酸荧光增白剂、蓝染料和紫染料,原纸层的上表面和下表面均施胶淀粉,所述制备方法包括以下步骤:(1)原纸生产;(2)表面施胶;(3)表面涂布。本发明通过在面层的面浆中加入荧光增白剂和染料,配合涂料进行调色,通过同时对面浆和涂料进行调色的方式,可以快速准确地控制纸张的白度和色相,避免成纸色差和批次间成纸色相不稳定等问题。
Description
技术领域
本发明涉及一种涂布纸及其制备方法,尤其涉及一种高白度的涂布白卡纸及其制备方法。
背景技术
外形美观、适合各种彩色印刷、以废纸再生浆为主要原料的涂布白纸板在高档商品包装中的应用越来越广泛。其中,高白度(又称亮度,国家标准GB/T 10335.4-2004规定优等品和一等品正面的白度分别为高于80%和78%)的涂布白卡纸需求量大。
纸张色相的调配是通过在抄纸的过程中添加一定的调色助剂,使成品纸的CIE白度、ISO白度和L*、a*、b*值均达到或接近纸色目标值。加入染料和颜料调色的目的,主要是为了使a*值、b*值与目标值匹配,同时还可以使纸张的CIE白度有较大程度的上升,即使纸张显白。涂布颜料由一种悬浮液由连续的液相和分散的固相组成,固相由颜料和其他为特定目的而加入的不溶物组成,涂布颜料的分散是否均匀是影响成纸色相一个关键因素,目前依然面临诸多问题。涂布白卡纸的白度、色相对印刷的影响很大,生产同一批次纸样时,白度、色相要求一致,所以在生产过程中对纸张白度、色相的控制是一个重点。受制于涂料配置的工艺和流程,涂料调色表现出来间歇性和滞后性,并且过分的依赖涂料调色,会造成涂料颜色过重,当纸张匀度和平整性表现不好时,会造成纸张正面横向和纵向蓝斑较多,影响成纸品质,无法满足使用要求。
发明内容
发明目的:本发明旨在提供一种的能够实现快速调色、色相稳定且色差小的高白度的涂布白卡纸,并且,本发明还提供了该涂布白卡纸的制备方法。
技术方案:本发明所述的高白度的涂布白卡纸,由上往下包括面涂层、原纸层和底涂层,所述原纸层由上往下包括面层、芯层和底层,所述面涂层和底涂层的配方中包括涂料、四磺酸荧光增白剂、颜料蓝和颜料紫,所述面层的配方中包括面浆、二磺酸荧光增白剂、蓝染料和紫染料,所述原纸层的上表面和下表面均施胶淀粉。
进一步地,所述四磺酸荧光增白剂、颜料蓝和颜料紫的质量比为1-5:1-3:1-2,二磺酸荧光增白剂、蓝染料和紫染料的质量比为2-5:1-3:1-3。
本发明所述的高白度的涂布白卡纸的制备方法,包括以下步骤:
(1)原纸生产:
面层:经打浆、配料制成的面浆,用计量泵将二磺酸荧光增白剂泵入混浆池,在第一冲浆泵进口处,用计量泵将蓝染料的稀释液和紫染料的稀释液二次稀释后泵入流送系统,最后将面浆送入成形网部形成面层;
芯层:经打浆、配料制成芯层浆料进入流浆箱后送入成形网部形芯层;
底层:经打浆、配料制成底层浆料进入流浆箱后送入成形网部形底层;
面层、芯层和底层三层经复合、压榨脱水、干燥,得原纸;
(2)表面施胶:用表面施胶淀粉对原纸的上下面进行表面施胶,并进行干燥;
(3)表面涂布:采用计量泵将四磺酸荧光增白剂、颜料蓝和颜料紫泵入涂料制备罐中,与涂料充分搅拌后对表面施胶后的原纸的上表面和下表面分别进行涂布,干燥后卷取,即得涂布白卡纸。
进一步地,步骤(1)中,所述的蓝染料的稀释液的浓度为4-6‰,紫染料的稀释液的浓度为4-6‰,,二次稀释的倍数为4-6倍,二磺酸荧光增白剂在计量泵中的流量为18-22L/h,蓝染料的稀释液在计量泵中的流量为9-11L/h,紫染料的稀释液在计量泵中的流量为9-11L/h,二磺酸荧光增白剂的用量为0.1-0.3kg/吨纸,蓝染料的稀释液的用量为0.05-0.15kg/吨纸,紫染料的稀释液的用量为0.05-0.12kg/吨纸。
进一步地,步骤(3)中,所述的颜料蓝的浓度为4-8%,颜料紫的浓度为4-8%,四磺酸荧光增白剂在计量泵中的流量为2-6L/min,颜料蓝在计量泵中的流量为2-6L/min,颜料紫在计量泵中的流量为2-4L/min,四磺酸荧光增白剂的用量为0.1-0.5kg/吨纸,颜料蓝的用量为0.1-0.3kg/吨纸,颜料紫的用量为0.1-0.2kg/吨纸。
进一步地,所述白卡纸还包括采用色相检测仪进行色相检测处理,所得色相数据反馈至原纸生产的纸机湿端,及时调控面浆中的染料和增白剂用量。
发明原理:本发明通过在面层的面浆中加入荧光增白剂,在流送中加入染料,配合涂料中的颜料和荧光增白剂进行调色,通过同时对面浆和涂料进行调色的方式,即时监测成纸的白度和色相,及时调整面浆中的荧光增白剂和染料用量,可以快速准确地控制纸张的白度和色相,避免成纸色差和批次间成纸色相不稳定等问题。
为了快速染色及提高染色牢度,本发明面层所使用染料为直接阴离子型紫染料和蓝染料,为了配合原纸生产中所用纸机的中性环境以及使面层中的纤维更好地保留着,面层使用的荧光增白剂为二磺酸荧光增白剂,该增白剂与纤维有很好的亲合力,自身单程保留率高;涂料中使用的荧光增白剂为四磺酸增白剂,该增白剂增白能力强,耐候性好,与涂料有较好的亲合力。
本发明涂布白卡纸由原纸层和涂布层复合而成,其中原纸层包括面、芯、底三层,面涂层共涂布了三层涂料,而底涂层仅一层涂料层,在原纸层的上下表面各表面施胶一层淀粉。常规白卡纸生产是通过涂料进行调整色相,而涂料制备具有间歇性,仅通过涂料对纸张进行色相调节,调整时间过长,易增加生产成本。而本发明结合了面层调色和涂料调色的优点,利用色相检测仪对纸张进行色相检测,并及时将色相数据反馈到纸机湿端,湿端通过快速调整面层染料和增白剂的添加量,以达到快速调色的目的。本发明可以快速调节纸张的色相,降低染料和增白剂的用量,也能维持色相的稳定。
此外,本发明在面层浆料中添加染料时,须先对染料进行稀释溶解,为保证调色均匀,最终确定稀释到5±1‰,避免流量波动造成的成纸色差,在加入到浆料管道中时,进行第二次稀释,再次进行4-6倍稀释,避免出现染色浆,即蓝纤维现象;加入点选择在第一冲浆泵进口处,目的让纤维染色更加均一,避免出现“蓝纤维”的现象。
有益效果:与现有技术相比,本发明具有如下显著优点:
(1)本发明通过染料稀释比例和加入点的选择,避免了色浆的产生;
(2)本发明在面层中加入染料,能够快速的稳定面层中浆料的色相,并且纸机正面有色相检测仪,可根据在线色相调整染料加入量,浆料色相稳定,可减少涂料色相的调整,有利于稳定涂料的色相;
(3)本发明缩短了改纸时间,多个加入点共同调整,集合了各流程调色的优点,减少了改纸所产生的回抄纸,降低了成本;
(4)本发明改纸过程只需20-30min进行调整,调整后的纸张白度稳定、颜色波动小,涂料色相稳定,能最大幅度的避免成纸色差。
附图说明
图1为本发明涂布白卡纸的结构示意图。
具体实施方式
下面结合实施例和附图对本发明的技术方案作进一步说明。
实施例1:如图1所示,本发明所述的高白度的涂布白卡纸由上往下包括面涂层、原纸层和底涂层,原纸层由上往下包括面层、芯层和底层,制备方法包括以下步骤:
(1)原纸生产
面层:经打浆、配料制成的面浆,将二磺酸荧光增白剂以20L/h的流量泵入混浆池,在第一冲浆泵进口处,用计量泵将5‰蓝染料稀释液以9.0L/h的流量,将5‰紫染料稀释液以10.4L/h的流量泵入流送系统,泵入之前进行5倍稀释。其中,蓝染料用量0.05kg/吨纸,紫罗兰用量0.08kg/吨纸,二磺酸荧光增白剂用量0.3kg/吨纸。最后,将面浆送入网部形成面层;
芯层:经打浆、配料制成芯层浆料进入流浆箱后送入成形网部形成芯层;
底层:经打浆、配料制成底层浆料进入流浆箱后送入成形网部形成底层;
面、芯、底三层经复合、压榨脱水,纸页进入干燥部进行干燥,干燥后的原纸进入施胶机进行施胶;
(2)用表面施胶淀粉对原纸进行表面施胶,并进行干燥;
(3)表面涂布:
采用计量泵将四磺酸荧光增白剂以4L/min的流量,将6%颜料蓝以4L/min的流量,将6%颜料紫以3.5L/min的流量泵入涂料制备罐中,与涂料充分搅拌后对表面施胶后的纸页的上下面进行涂布,其中,四磺酸荧光增白剂用量为0.2kg/吨纸,颜料蓝用量为0.15kg/吨纸,颜料紫用量为0.11kg/吨纸。涂布并干燥后卷取,得涂布白卡纸。
成纸物理指标具体如表1所示:成纸白度、L*值、a*值、b*值均能满足生产标准,未出现因色差降级现象。
表1实施例1制得的涂布白卡纸的性能表
物理指标 | 标准值 | 实际数据 |
白度%(正面/反面) | 89.2±2/88.5±2 | 90.2/89.3 |
L*值(正面/反面) | 94.0±1/94.0±1 | 94.5/93.1 |
a*值(正面/反面) | 1.65±0.3/1.65±0.3 | 1.69/1.54 |
b*值(正面/反面) | -3.5±0.4/-2.0±0.4 | -3.1/-1.9 |
实施例2:本发明所述的高白度的涂布白卡纸由上往下包括面涂层、原纸层和底涂层,原纸层由上往下包括面层、芯层和底层,制备方法包括以下步骤:
(1)原纸生产
面层:经打浆、配料制成的面浆,将二磺酸荧光增白剂以20L/h的流量泵入混浆池,在第一冲浆泵进口处,用计量泵将5‰蓝染料稀释液以9.0L/h的流量,将5‰紫染料稀释液以10.5L/h的流量泵入流送系统,泵入之前进行5倍稀释。其中,蓝染料用量0.04kg/吨纸,紫罗兰用量0.08kg/吨纸,二磺酸荧光增白剂用量0.27kg/吨纸。最后,将面浆送入网部形成面层;
芯层:经打浆、配料制成芯层浆料进入流浆箱后送入成形网部形成芯层;
底层:经打浆、配料制成底层浆料进入流浆箱后送入成形网部形成底层;
面、芯、底三层经复合、压榨脱水,纸页进入干燥部进行干燥,干燥后的原纸进入施胶机进行施胶;
(2)用表面施胶淀粉对原纸进行表面施胶,并进行干燥;
(3)表面涂布:
采用计量泵将四磺酸荧光增白剂以4L/min的流量,将6%颜料蓝以4L/min的流量,将6%颜料紫以3.5L/min的流量泵入涂料制备罐中,与涂料充分搅拌后对表面施胶后的原纸的上表面和下表面进行涂布,其中,四磺酸荧光增白剂用量为0.18kg/吨纸,颜料蓝用量为0.21kg/吨纸,颜料紫用量为0.11kg/吨纸。涂布并干燥后卷取,得涂布白卡纸。
成纸物理指标具体如表2所示:成纸白度、L*值、a*值、b*值均能满足生产要求,未出现因色差降级现象。
表2实施例2制得的涂布白卡纸的性能表
物理指标 | 标准值 | 实际数据 |
白度%(正面/反面) | 89.2±2/88.5±2 | 90.8/88.9 |
L*值(正面/反面) | 94.0±1/94.0±1 | 94.9/93.4 |
a*值(正面/反面) | 1.65±0.3/1.65±0.3 | 1.89/1.41 |
b*值(正面/反面) | -3.5±0.4/-2.0±0.4 | -3.45/-1.89 |
对比例1:与实施例1的不同之处在于:步骤(1)中,面层:经打浆、配料制成面层浆料进入流浆箱后送入成形网部形成面层。步骤(3)中采用计量泵将四磺酸荧光增白剂以4L/min的流量,将6%蓝染料以4L/min的流量,将6%紫染料以3.5L/min的流量泵入涂料制备罐中,与涂料充分搅拌后进行涂布,其中,四磺酸荧光增白剂用量为0.29kg/吨纸,蓝染料用量为0.23kg/吨纸,紫染料用量为0.14kg/吨纸。涂布并干燥后卷取,得涂布白卡纸。
成纸物理指标具体如表3所示:成纸白度、L*值、均能生产要求,但a*值、b*值未达到生产标准,涂料调色时间较长,并出现蓝斑纸病。由此可知,面层不加染料,纸张会过度依赖于涂料调色,易造成涂料颜色过重,当纸张匀度和平整性表现不好时,会造成纸张正面横向和纵向蓝斑较多,成纸色相不稳定。
表3对比例1制得的涂布白卡纸的性能表
物理指标 | 标准值 | 实际数据 |
白度%(正面/反面) | 89.2±2/88.5±2 | 90.5/89.9 |
L*值(正面/反面) | 94.0±1/94.0±1 | 94.5/93.1 |
a*值(正面/反面) | 1.65±0.3/1.65±0.3 | 1.26/1.04 |
b*值(正面/反面) | -3.5±0.4/-2.0±0.4 | -3.01/-1.31 |
对比例2:与实施例1的不同之处在于:步骤(1)中,面层:经打浆、配料制成的面浆,在纸机浆池处,用计量泵将5‰蓝染料稀释液以9.0L/h的流量,将5‰紫染料稀释液以10.5L/h的流量,以及将二磺酸荧光增白剂以20L/h的流量泵入纸机浆池。
成纸物理指标具体如表4所示:由于色相检测仪的在线监测,及时调整面浆中的染料和增白剂用量,成纸白度、L*值、a*值、b*值符合生产标准,但由于染料的加入点在浓浆处,导致出现了蓝纤维现象。
表4对比例2制得的涂布白卡纸的性能表
物理指标 | 标准值 | 实际数据 |
白度%(正面/反面) | 89.2±2/88.5±2 | 90.8/88.9 |
L*值(正面/反面) | 94.0±1/94.0±1 | 94.9/93.4 |
a*值(正面/反面) | 1.65±0.3/1.65±0.3 | 1.59/1.41 |
b*值(正面/反面) | -3.5±0.4/-2.0±0.4 | -3.56/-1.91 |
Claims (9)
1.一种高白度的涂布白卡纸,其特征在于,由上往下包括面涂层、原纸层和底涂层,所述原纸层由上往下包括面层、芯层和底层,所述面涂层和底涂层的配方中包括涂料、四磺酸荧光增白剂、颜料蓝和颜料紫,所述面层的配方中包括面浆、二磺酸荧光增白剂、蓝染料和紫染料,所述原纸层的上表面和下表面均施胶淀粉。
2.根据权利要求1所述的涂布白卡纸,其特征在于,所述四磺酸荧光增白剂、颜料蓝和颜料紫的质量比为1-5:1-3:1-2。
3.根据权利要求1所述的涂布白卡纸,其特征在于,所述二磺酸荧光增白剂、蓝染料和紫染料的质量比为2-5:1-3:1-3。
4.一种权利要求1所述的高白度的涂布白卡纸的制备方法,其特征在于,包括以下步骤:
(1)原纸生产:
面层:经打浆、配料制成的面浆,用计量泵将二磺酸荧光增白剂泵入混浆池,在第一冲浆泵进口处,用计量泵将蓝染料的稀释液和紫染料的稀释液二次稀释后泵入流送系统,最后将面浆送入成形网部形成面层;
芯层:经打浆、配料制成芯层浆料进入流浆箱后送入成形网部形芯层;
底层:经打浆、配料制成底层浆料进入流浆箱后送入成形网部形底层;
面层、芯层和底层三层经复合、压榨脱水、干燥,得原纸;
(2)表面施胶:用表面施胶淀粉对原纸的上下面进行表面施胶,并进行干燥;
(3)表面涂布:采用计量泵将四磺酸荧光增白剂、颜料蓝和颜料紫泵入涂料制备罐中,与涂料充分搅拌后对表面施胶后的原纸的上表面和下表面分别进行涂布,干燥后卷取,即得涂布白卡纸。
5.根据权利要求4所述的制备方法,其特征在于,步骤(1)中,所述的蓝染料的稀释液的浓度为4-6‰,紫染料的稀释液的浓度为4-6‰,二次稀释的倍数为4-6倍。
6.根据权利要求4所述的制备方法,其特征在于,步骤(1)中,所述的二磺酸荧光增白剂在计量泵中的流量为18-22L/h,蓝染料的稀释液在计量泵中的流量为9-11L/h,紫染料的稀释液在计量泵中的流量为9-11L/h。
7.根据权利要求4所述的制备方法,其特征在于,步骤(3)中,所述白卡纸还包括色相检测处理,所得色相数据反馈至原纸生产的纸机湿端,及时调控面浆中的染料和增白剂用量。
8.根据权利要求4所述的制备方法,其特征在于,步骤(3)中,所述的颜料蓝的浓度为4-8%,颜料紫的浓度为4-8%。
9.根据权利要求4所述的制备方法,其特征在于,步骤(3)中,所述的四磺酸荧光增白剂在计量泵中的流量为2-6L/min,颜料蓝在计量泵中的流量为2-6L/min,颜料紫在计量泵中的流量为2-4L/min。
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