CN111945474A - 一种高强度瓦楞芯纸及其生产方法 - Google Patents

一种高强度瓦楞芯纸及其生产方法 Download PDF

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CN111945474A
CN111945474A CN202010794810.4A CN202010794810A CN111945474A CN 111945474 A CN111945474 A CN 111945474A CN 202010794810 A CN202010794810 A CN 202010794810A CN 111945474 A CN111945474 A CN 111945474A
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pulp
paper
waste paper
slag
corrugated medium
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殷宪文
周国伟
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Nine Dragons Paper Industries Tianjin Co ltd
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Abstract

本发明提供一种高强度瓦楞芯纸及其生产方法，生产方法包括以下步骤：S1：破碎；S2：筛料；S3：制浆；S4：抄造。本发明生产的瓦楞芯纸以国内废纸为主要生产原料，同时增加少量木纤维，通过粗筛和分级筛，筛选出短纤维和长纤维，通过短纤维和长纤维的结合，控制瓦楞芯纸的强度，在废纸浆中加入胶黏物控制酶用于控制废纸浆中的胶黏物，并且在长纤维打浆时，加入活性剂对损伤的长纤维进行修复，同时采用羧甲基纤维素聚乙烯醇作为助留剂，采用聚乙烯醇和酚醛树脂作为抗水剂，大大提高了瓦楞芯纸的强度。

Description

一种高强度瓦楞芯纸及其生产方法
技术领域
本发明是一种高强度瓦楞芯纸及其生产方法，属于瓦楞纸制备技术领域。
背景技术
瓦楞纸是纸质包装箱常见的用料，它比木箱质轻，又有硬度，大小容易剪裁，用来保护被包装的其他产品不被损害。瓦楞芯纸是构成瓦楞纸板波纹状中芯所用的原料纸，也可以单独用作易碎物品的包装用纸，应具有较高的挺度、环压强度和吸水性。
现有技术中，高强度的瓦楞芯纸生产主要依赖进口废纸，当瓦楞芯纸原料主要使用国内废纸时，在低克重的情况下，生产的瓦楞芯纸强度低，抗水性差，对包装的产品可能造成直接损害。
发明内容
针对现有技术存在的不足，本发明的目的是提供一种高强度瓦楞芯纸及其生产方法，以解决上述背景技术中提出的问题。
为了实现上述目的，本发明提供了一种高强度瓦楞芯纸的生产方法，包括以下步骤：
S1：破碎
将一定质量比的国内废纸、欧洲废纸和木纤维加入水力碎浆机内充分碎解后，送入高浓度除渣器内除渣，得到废纸浆A和渣料A，然后将废纸浆A送入气动搅拌机内，并加入胶粘物控制酶混合均匀，得到废纸浆B，将渣料A送入水力碎浆机重新破碎，其中，国内废纸、进口废纸和木纤维的质量份数比为85～90:4～6:6～11；
S2：筛料
S2.1：将废纸浆B经过粗筛和分级筛，筛选出短纤维废纸浆和长纤维废纸浆，并得到渣料B和渣料C；
S2.2：将短纤维废纸浆送入低浓度除渣器中除渣后，经过多圆盘浓缩机处理，然后加入白水打浆，得到短纤浆，将长纤维废纸浆送入低浓度除渣器中除渣后，经过精筛，送入多圆盘浓缩机处理，经过盘磨后，加入白水和活性剂打浆，得到长纤浆；
S2.3：将渣料B和渣料C送入水力碎浆机重新破碎；
S3：制浆
将步骤S2.2制得的短纤浆和长纤浆在纸机浆池中按质量份数比为60～70:30～40的比例混合均匀，得到浆料，然后加入一定量的增强剂和助留剂混合均匀，输送至除渣器中去除浆料中的重杂质，然后输送至压力筛，进行筛选、净化和均匀分散浆料，得到造纸浆；
其中，增强剂为聚丙烯酰胺和双醛淀粉组成的双元增强剂，聚丙烯酰胺、双醛淀粉与造纸浆的质量份数比为0.004～0.015:0.002～0.01:1；
S4：抄造。
采用上述方案，以国内废纸为主要原料生产高强度瓦楞芯纸，能够降低生产成本，增加木纤维为瓦楞芯纸的原料，能够增加瓦楞芯纸的挺度，在废纸浆A中加入胶黏物控制酶，一方面可以控制和去除废纸浆A中的胶黏物，另一方面可以减少胶黏物控制酶的用量，在造纸浆的制备过程中，打成的浆料中的纤维多有损伤，尤其是长纤维，利用活性剂可以对损伤的长纤维进行修复，使得制成的瓦楞芯纸柔韧度和强度更高，将高浓除渣器、粗筛和精筛分离出的渣料A、渣料B和渣料C再次送入水力碎浆机中破碎，提高了废纸的利用率，经过打浆后得到的短纤浆和长纤浆，能够增加纤维之间的接触面积，增强纤维间的交织力，从而增加瓦楞芯纸的强度，制浆过程中加入聚丙烯酰胺和双醛淀粉能够进一步增强瓦楞芯纸的强度。
优选的，步骤S1中，胶黏物控制酶为酯酶和脂肪酶中的一种或两种，胶黏物控制酶与废纸浆A的质量份数比为0.004～0.01:1。
采用上述方案，酯酶和脂肪酶可以加快黏性物质酯键的断裂，使黏附物的黏附效率降低，从而控制和去除废纸浆A中的胶黏物。
优选的，步骤S2.2中，活性剂与长纤浆的质量份数比为0.006～0.015:1，其中，活性剂由聚丙烯酰胺和醋酸酐组成，聚丙烯酰胺和醋酸酐的质量份数比为1～2:1。
采用上述方案，聚丙烯酰胺和醋酸酐可以增加长纤浆中长纤维的强度，对损伤的长纤维起到修复作用，从而使得制成的瓦楞芯纸具有更高的柔韧度和强度。
优选的，步骤S2.2中，短纤浆的浓度为6wt～8wt％，长纤浆的浓度为6wt～8wt％。
采用上述方案，通过粗筛和分级筛，筛选出短纤维废纸浆和长纤维废纸浆，在瓦楞芯纸中，短纤维提供匀度，长纤维提供纸张的韧性，通过短纤维和长纤维的结合，可以控制瓦楞芯纸的强度。
优选的，步骤S2.2中，粗筛压差为25kpa～35kpa，分级筛压差为20kpa～30kpa，分级筛筛缝宽为0.06～0.08mm，以筛选出短纤维废纸浆，精筛压差为25kpa～35kpa，盘磨进刀的功率为300kw～350kw。
采用上述方案，有利于将长纤维废纸浆处理为长纤浆，提高了生产效率。
优选的，步骤S3中，助留剂为羧甲基纤维素和微粒子组成的双元助留剂，羧甲基纤维素、微粒子与浆料的质量份数比为0.008～0.02:0.003～0.017:1。
采用上述方案，使用羧甲基纤维素和微粒子作为助留剂，能提高网部留着率、节省纤维原料、提高纸页滤水性，同时能够减少沉淀物。
优选的，步骤S4具体为，将步骤S3中的造纸浆输送至流浆箱，然后依次通过成型区的网部和压榨部得到湿纸，将抗水剂喷洒至湿纸表面，经过干燥和压光机压光后进入卷纸机进行卷曲，卷曲后的复卷打包过磅后，入库储存。
采用上述方案，湿纸表面喷洒上抗水剂，能够提高瓦楞芯纸的抗水性。
优选的，抗水剂为聚乙烯醇和酚醛树脂，将抗水剂喷洒到湿纸上，经过120℃～170℃烘干后形成涂层，涂层的绝干涂布量为10～20g/m2。
采用上述方案，聚乙烯醇与酚醛树脂结合后被醛化，具有疏水的性质，因此，作为瓦楞芯纸的表面涂层，可以大大提高瓦楞芯纸的抗水性能，保证在潮湿的环境下，瓦楞芯纸仍具有很高的强度。
优选的，出网部干度为32％～43％，出压榨干度为58％～64％。
采用上述方案，有利于抗水剂更好的附着在湿纸表面。
本发明还提供了上述生产方法生产的一种高强度瓦楞芯纸，高强度瓦楞芯纸的定量为55-60g/m2，环压指数为2.1～2.5N·m/g，耐破指数为1.4～1.8kPa·m2/g，挺度0.65-0.72mN·m，正面吸水性35～37g/m2。
本发明具有以下有益效果：
(1)本发明在废纸浆A中加入酯酶和脂肪酶，一方面可以控制和去除废纸浆A中的胶黏物，另一方面可以减少胶黏物控制酶的用量，将高浓除渣器、粗筛和精筛分离出的渣料A、渣料B和渣料C再次送入水力碎浆机中破碎处理，提高了废纸的利用率。
(2)本发明在长纤维打浆时加入聚丙烯酰胺和醋酸酐对损伤的长纤维进行修复，使得制成的瓦楞芯纸柔韧度和强度更高，在制浆过程中加入聚丙烯酰胺和双醛淀粉进一步增强了瓦楞芯纸的强度。
(3)本发明使用羧甲基纤维素和微粒子作为助留剂，能提高网部留着率、节省纤维原料、提高纸页滤水性，同时能够减少沉淀物。
(4)本发明使用聚乙烯醇和酚醛树脂组成的抗水剂涂覆在瓦楞芯纸表面，提高了瓦楞芯纸的抗水性能。
附图说明
图1为本发明所述的高强度瓦楞芯纸的生产方法流程图。
具体实施方式
为使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施方式，进一步阐述本发明。
实施例1
本实施例的一种高强度瓦楞芯纸的生产方法，包括以下步骤：
S1：破碎
将一定质量比的国内废纸、欧洲废纸和木纤维加入水力碎浆机内充分碎解后，送入高浓度除渣器内除渣，得到废纸浆A和渣料A，然后将废纸浆A送入气动搅拌机内，并加入酯酶和脂肪酶混合均匀，得到废纸浆B，将渣料A送入水力碎浆机重新破碎，其中，国内废纸、欧洲废纸和木纤维的质量份数比为85:4:11，酯酶、脂肪酶和废纸浆A的质量份数比为0.002:0.002:1；
S2：筛料
S2.1：将废纸浆B经过粗筛和分级筛，筛选出短纤维废纸浆和长纤维废纸浆，并得到渣料B和渣料C，粗筛压差为35kpa，分级筛压差为30kpa，分级筛筛缝宽为0.06mm；
S2.2：将短纤维废纸浆送入低浓度除渣器中除渣后，经过多圆盘浓缩机处理，然后加入白水打浆，得到短纤浆，将长纤维废纸浆送入低浓度除渣器中除渣后，经过精筛，送入多圆盘浓缩机处理，经过盘磨后，加入白水、聚丙烯酰胺和醋酸酐打浆，得到长纤浆，精筛压差为35kpa，盘磨进刀的功率为350kw，得到的短纤浆C的浓度为6wt％，长纤浆D的浓度为6wt％，聚丙烯酰胺、醋酸酐和长纤浆的质量份数比为0.002:0.004:1；
S2.3：将渣料B和渣料C送入水力碎浆机重新破碎；
S3：制浆
将步骤S2.2制得的短纤浆和长纤浆在纸机浆池中按质量份数比为60:40的比例混合均匀，得到浆料，然后加入聚丙烯酰胺和双醛淀粉混合均匀，之后再加入羧甲基纤维素和微粒子搅拌均匀，聚丙烯酰胺、双醛淀粉与浆料的质量份数比为0.004:0.004:1，羧甲基纤维素、微粒子与浆料的质量份数比为0.01:0.007:1，然后输送至除渣器，去除浆料中的重杂质，之后输送至压力筛，进行筛选、净化和均匀分散浆料，得到造纸浆；
S4：抄造
将步骤S3中的造纸浆输送至流浆箱，然后依次通过成型区的网部和压榨部得到湿纸，出网部干度为35％，出压榨干度为60％，将制成的聚乙烯醇和酚醛树脂抗水剂喷洒到湿纸上，经过170℃烘干后形成涂层，涂层的绝干涂布量为17g/m2，然后经过压光机压光后，进入卷纸机进行卷曲，卷曲后的复卷打包过磅后，入库储存。
实施例2-4
实施例2-4的各实验参数详见表1，其他实验参数同实施例1。
表1实施例2-4的各实验参数
Figure BDA0002625143950000061
表2示出了实施例1-4和对比例1-4的各实验参数，与实施例相对应的对比例实验中，除了不添加胶粘物控制酶和活性剂外，其他步骤与相应的实施例各步骤完全相同，具体实验结果详见表2和表3。
表2实施例和对比例的各实验参数
Figure BDA0002625143950000062
表3实施例和现有技术中的瓦楞芯纸(市售优等品)的技术指标测试结果
Figure BDA0002625143950000063
Figure BDA0002625143950000071
表3列出了实施例和现有技术中的瓦楞芯纸的技术指标测试结果，从表3可以看出，对比例1-4得到的瓦楞芯纸的定量和正面吸水性与实施例1-4相差不大，对比例1-4得到的瓦楞芯纸的环压指数、耐破指数和挺度明显低于实施例1-4，表明胶粘物控制酶和活性剂的添加能够增强瓦楞芯纸的强度，实施例1-4得到的瓦楞芯纸的环压指数、耐破指数和挺度高于现有技术中的瓦楞芯纸，实施例1-4得到的瓦楞芯纸的吸水性低于现有技术中的瓦楞芯纸，说明利用本发明的生产方法生产的瓦楞芯纸具有高强度、高挺度和正面防水性能优异的特点，并且，实施例1-4得到的瓦楞芯纸的环压指数和耐破指数明显高于现有技术中的瓦楞芯纸，表明利用本发明生产方法生产的瓦楞芯纸，能够大大提高瓦楞芯纸的强度。
以上显示和描述了本发明的基本原理和主要特征和本发明的优点，对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (10)

1.一种高强度瓦楞芯纸的生产方法，其特征在于，包括以下步骤：
S1：破碎
将一定质量比的国内废纸、欧洲废纸和木纤维加入水力碎浆机内充分碎解后，送入高浓度除渣器内除渣，得到废纸浆A和渣料A，然后将废纸浆A送入气动搅拌机内，并加入胶粘物控制酶混合均匀，得到废纸浆B，将渣料A送入水力碎浆机重新破碎，其中，国内废纸、进口废纸和木纤维的质量份数比为85～90:4～6:6～11；
S2：筛料
S2.1：将废纸浆B经过粗筛和分级筛，筛选出短纤维废纸浆和长纤维废纸浆，并得到渣料B和渣料C；
S2.2：将短纤维废纸浆送入低浓度除渣器中除渣后，经过多圆盘浓缩机处理，然后加入白水打浆，得到短纤浆，将长纤维废纸浆送入低浓度除渣器中除渣后，经过精筛，送入多圆盘浓缩机处理，经过盘磨后，加入白水和活性剂打浆，得到长纤浆；
S2.3：将渣料B和渣料C送入水力碎浆机重新破碎；
S3：制浆
将步骤S2.2制得的短纤浆和长纤浆在纸机浆池中按质量份数比为60～70:30～40的比例混合均匀，得到浆料，然后加入一定量的增强剂和助留剂混合均匀，输送至除渣器中去除浆料中的重杂质，然后输送至压力筛，进行筛选、净化和均匀分散浆料，得到造纸浆；
其中，增强剂为聚丙烯酰胺和双醛淀粉组成的双元增强剂，聚丙烯酰胺、双醛淀粉与造纸浆的质量份数比为0.004～0.015:0.002～0.01:1；
S4：抄造。
2.根据权利1所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S1中，胶粘物控制酶为酯酶和脂肪酶中的一种或两种，胶粘物控制酶与废纸浆A的质量份数比为0.004～0.01:1。
3.根据权利2所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S2.2中，活性剂与长纤浆的质量份数比为0.006～0.015:1，其中，活性剂由聚丙烯酰胺和醋酸酐组成，聚丙烯酰胺和醋酸酐的质量份数比为1～2:1。
4.根据权利要求1或3所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S2.2中，短纤浆的浓度为6wt～8wt％，长纤浆的浓度为6wt～8wt％。
5.根据权利要求4所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S2.2中，粗筛压差为25kpa～35kpa，分级筛压差为20kpa～30kpa，分级筛筛缝宽为0.06～0.08mm，以筛选出短纤维废纸浆，精筛压差为25kpa～35kpa，盘磨进刀的功率为300kw～350kw。
6.根据权利要求5所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S3中，助留剂为羧甲基纤维素和微粒子组成的双元助留剂，羧甲基纤维素、微粒子与浆料的质量份数比为0.008～0.02:0.003～0.017:1。
7.根据权利要求6所述的一种高强度瓦楞芯纸的生产方法，其特征在于，步骤S4具体为，将步骤S3中的造纸浆输送至流浆箱，然后依次通过成型区的网部和压榨部得到湿纸，将抗水剂喷洒至湿纸表面，经过干燥和压光机压光后进入卷纸机进行卷曲，卷曲后的复卷打包过磅后，入库储存。
8.根据权利要求7所述的一种高强度瓦楞芯纸的生产方法，其特征在于，抗水剂为聚乙烯醇和酚醛树脂，将抗水剂喷洒到湿纸上，经过120℃～170℃烘干后形成涂层，涂层的绝干涂布量为10～20g/m2。
9.根据权利要求8所述的一种高强度瓦楞芯纸的生产方法，其特征在于，出网部干度为32％～43％，出压榨干度为58％～64％。
10.一种如权利要求1-9任一所述生产方法生产的高强度瓦楞芯纸，其特征在于，高强度瓦楞芯纸的定量为55-60g/m2，环压指数为2.1～2.5N·m/g，耐破指数为1.4～1.8kPa·m2/g，挺度0.65-0.72mN·m，正面吸水性35～37g/m2。
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Application publication date: 20201117