CN105482222A - 一种缓冲复合包装纸及其制备方法 - Google Patents

一种缓冲复合包装纸及其制备方法 Download PDF

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CN105482222A
CN105482222A CN201510973586.4A CN201510973586A CN105482222A CN 105482222 A CN105482222 A CN 105482222A CN 201510973586 A CN201510973586 A CN 201510973586A CN 105482222 A CN105482222 A CN 105482222A
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packaging paper
needle
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diaphragm
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陈庆
曾军堂
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Hebei Yunrui Plastic Co.,Ltd.
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Chengdu New Keli Chemical Science Co Ltd
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Abstract

本发明提出一种缓冲复合包装纸及其制备方法，属于包装纸领域。该缓冲复合包装纸是通过短纤维携带发泡剂，使发泡剂以针状形式匀均分布在物料中。利用在口模出料时针状发泡剂气化形成以短纤维为中心的针状空心泡。不同于直接添加发泡剂形成的近似球形空洞，该发泡体的针状气孔更均匀，达到了微泡级，针状气孔在降低密度满足缓冲的同时，其网络交织的针型孔分布增加了挺度。利用本方法生产的发泡体挺度高、抗压能力较强、尺寸稳定、减震性能优良，从而可以替代目前传统的纸板、蜂窝纸等用于包装纸。

Description

一种缓冲复合包装纸及其制备方法
技术领域
本发明涉及包装纸领域，具体涉及一种具有缓冲功能的复合包装纸及其制备方法。
背景技术
目前环保石头纸主要是利用塑料加工工艺，采用螺杆挤出机,通过对无机粉体偶联处理实现高填充，可进行吹膜或者压延形成纸张。随着石头纸的推广，其缺陷也逐渐暴露出来。其主要的缺点是：密度大，缺少纸感，挺度较低。特别是在包装领域应用，石头纸由于缺少植物纤维的支撑，因此缓冲性差，挺度低。为了拓展石头纸在包装领域的应用（如用于电子商务的各类信封、纸盒、纸袋等），首要解决纸张缓冲和挺度问题。
中国发明专利CN102205668A公开了一种石头纸蜂窝纸板，该发明利用传统蜂窝纸的原理制备了石头纸蜂窝纸板，但由于石头纸自重较大、挺度低，制备的蜂窝纸板抗形变能较差。
为了根本降低石头纸的自重，发泡技术目前得到了较好的应用。如中国发明专利CN102229188A明公开了一种轻质石头纸的制造方法，将石头纸原材料分别造粒，其中部分添加发泡剂，经过纸膜制造机成型制成轻质石头纸。中国发明专利CN104441870A公开了一种低密度石头纸及其制备方法，利用发泡母粒，经由挤出装置三层流道在模头模口处挤出成上中下三层叠加组合物，得到低密度石头纸。中国发明专利CN103881214A公开了高填充膨润土发泡石头纸及其制备方法，利用膨润土的结合水赋予体系发泡功能，可替代化学发泡剂使用。
根据上述，通过直接使用发泡剂可以降低石头纸的密度，但由于发泡剂的成型微孔为近似圆形，导致发泡的石头纸变软，在用于包装纸盒时挺度较差，特别是使用发泡剂产生的近似圆孔极易导致纸张表面出现贯通气孔。
发明内容
为了克服上述缺陷，本发明的目的在于提供一种具有缓冲功能的复合包装纸，特别是该缓冲复合包装纸具有缓冲的同时挺度较高，适用于制作各类包装纸盒。进一步提供该缓冲复合包装纸的制备方法。
一种缓冲复合包装纸的制备方法,其特征是包括如下制备步骤：
（1）将矿物短纤维在复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用，其中矿物短纤维选取直径≤10μm，长径比为5-10的短纤维；
(2)将步骤（1）得到的纤维状发泡剂1-3重量份与重量份75-85份的无机粉体、重量份15-20份的高分子聚合物、重量份2-4份的润滑助剂、重量份1-3份的颜料粉在100-120℃条件下搅拌混合30-45min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
上述制备方法，步骤（1）所述的矿物短纤维为水镁石纤维、粉煤灰纤维、硅灰石纤维、碳酸钙纤维、海泡石纤维中的至少一种。
上述制备方法，步骤（1）所述的复合发泡液为偶氮二甲酰胺(AC)溶于碳酸氢钠溶液中形成的复合发泡剂。上述制备方法，步骤（2）所述的无机粉体为粒径800-1250目的重质碳酸钙、滑石粉、高岭土中的至少一种。
上述制备方法，步骤（2）所述的润滑助剂选用硬脂酸、氧化聚乙烯蜡、白油、植物油、矿物油、钛酸酯偶联剂、铝酸酯偶联剂中的至少一种作为加工助剂；所述的颜料粉选用钛白粉、氧化锌、立德粉中的至少一种；所述的高分子聚合物为高密度聚乙烯、聚苯乙烯、聚丙烯中的至少一种。
上述制备方法，步骤（4）所述纵向拉伸的拉伸比例为103-105:100。
本发明通过短纤维携带发泡剂，使发泡剂以针状形式匀均分布在物料中。在口模出料形成纸片的同时，针状发泡剂气化形成以短纤维为中心的针状空心泡。不同于直接添加发泡剂形成的近似球形空洞，该发泡体的针状气孔更均匀，达到了微泡级，针状气孔在降低密度满足缓冲的同时，其网络交织的针型孔分布增加了挺度。利用本方法生产的发泡体挺度高、抗压能力较强、尺寸稳定、减震性能优良，从而可以替代目前传统的纸板、蜂窝纸等用于缓冲包装纸。
一种缓冲复合包装纸，其特征是由上述制备方法制得，发泡孔为针状空心泡，具有低密度、高挺度的特性。克服了直接使用发泡剂产生的近似圆型气泡易导致纸挺度降低、表面出现贯通孔的缺陷。
本发明一种缓冲复合包装纸及其制备方法，与现有技术相比突出的特点和有益的效果在于：
1、通过短纤维携带发泡剂，使发泡剂以针状形式匀均分布在物料中。针状发泡剂气化形成以短纤维为中心的针状空心泡，克服了直接添加发泡剂形成近似球形空洞使纸张变软的缺陷。其网络交织的针型孔分布降低了密度，同时增加了纸张挺度。
2、发泡剂通过纤维携带和分散，在纸膜形成和拉伸时沿拉伸方向分布，该发泡体的针状气孔沿拉伸方向均匀分布，克服了直接发泡造成的表面气孔缺陷。
3、本发明一种缓冲复合包装纸及其制备方法，提升了石头纸纸张的缓冲性和挺度，减少了生产步骤，提高了生产效率。
具体实施方式
以下通过具体实施方式对本发明作进一步的详细说明，但不应将此理解为本发明的范围仅限于以下的实例。在不脱离本发明上述方法思想的情况下,根据本领域普通技术知识和惯用手段做出的各种替换或变更,均应包含在本发明的范围内。
实施例1
（1）将直径≤10μm，长径比为5-10的短纤维水镁石纤维在偶氮二甲酰胺\碳酸氢钠复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用；
(2)将步骤（1）得到的纤维状发泡剂3重量份与重量份60份的重质碳酸钙、重量份15份的高岭土滑、重量份15份的高密度聚乙烯、重量份2份的铝酸酯偶联剂、重量份1份的氧化锌在100-120℃条件下搅拌混合30min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
缓冲复合包装纸纸张密度出现大幅降低，挺度升高,具有良好的缓冲性。具体检测结果如表一：
实施例2
（1）将直径≤10μm，长径比为5-10的短纤维硅灰石在偶氮二甲酰胺\碳酸氢钠复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用；
(2)将步骤（1）得到的纤维状发泡剂2重量份与重量份65份的滑石粉、重量份15份的高岭土滑、重量份18份的聚丙烯、重量份3份的硬脂酸、重量份1份的钛白粉在100-120℃条件下搅拌混合30min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
缓冲复合包装纸纸张密度出现大幅降低，挺度升高,具有良好的缓冲性。具体检测结果如表一：
实施例3
（1）将直径≤10μm，长径比为5-10的短纤维水镁石在偶氮二甲酰胺\碳酸氢钠复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用；
(2)将步骤（1）得到的纤维状发泡剂3重量份与重量份55份的重质碳酸钙、重量份25份的滑石粉、重量份20份的聚苯乙烯、重量份4份的白油、重量份2份的硫酸钡在100-120℃条件下搅拌混合30min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
缓冲复合包装纸纸张密度出现大幅降低，挺度升高,具有良好的缓冲性。具体检测结果如表一：
实施例4
（1）将直径≤10μm，长径比为5-10的短纤维粉煤灰在偶氮二甲酰胺\碳酸氢钠复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用；
(2)将步骤（1）得到的纤维状发泡剂2重量份与重量份50份的重质碳酸钙、重量份20份的滑石粉、重量份10份的高岭土、重量份15份的高密度聚乙烯、重量份3份的氧化聚乙烯蜡、重量份2份的立德粉在100-120℃条件下搅拌混合30min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
缓冲复合包装纸纸张密度出现大幅降低，挺度升高,具有良好的缓冲性。具体检测结果如表一：
表一：
测试指标 实施例1 实施例2 实施例3 实施例4
纸张厚度（mm） 0.60 0.65 0.6 0.70
定量（g/ m2） 408 408 396 490
密度（g/cm3） 0.68 0.63 0.66 0.70
泰伯挺度（纵/横）（mN·m） 18.5/12.3 19.6/11.6 19/13 21.2/15.3
边压强度（kN/m） 6.8 7.0 7.3 6.9

Claims (6)

1.一种缓冲复合包装纸的制备方法,其特征是通过针形孔制备缓冲包装纸,包括如下制备步骤：
（1）将矿物短纤维在复合发泡液中浸泡24h以上，使复合发泡液嵌入到矿物纤维表面，然后滤干得到纤维状发泡剂备用，其中矿物短纤维选取直径≤10μm，长径比为5-10的短纤维；
(2)将步骤（1）得到的纤维状发泡剂1-3重量份与重量份75-85份的无机粉体、重量份15-20份的高分子聚合物、重量份2-4份的润滑助剂、重量份1-3份的颜料粉在100-120℃条件下搅拌混合30-45min得到混合物；
(3)将步骤(2)得到的混合物通过挤出机进行熔融混炼挤出造粒，熔融温度控制在140℃至160℃之间，纤维状发泡剂通过混炼以针状形式均匀分散在粒料中；
（4）将步骤（3）得到的粒料送入挤出机，挤出机机筒温度设定为180-195℃，T型口模温度设置为210-220℃，物料通过口模时，纤维状发泡剂发生气化，在膜片中形成以纤维为中心的针状空心泡，膜片经牵引辊牵引，同时牵引辊内通加热油，在牵引过程中控制膜片温度在60-80℃，在张力作用下纵向拉伸，拉伸过程中膜片紧贴辊筒，辊与辊之间不需要挤压；
（5）拉伸的膜片经三辊冷却后根据膜片厚度调整辊距进行平整、切边、收卷，得到一种缓冲复合包装纸。
2.根据权利要求1所述一种缓冲复合包装纸的制备方法，其特征在于：制备步骤（1）所述的矿物短纤维为水镁石纤维、粉煤灰纤维、硅灰石纤维、碳酸钙纤维、海泡石纤维中的至少一种。
3.根据权利要求1所述一种缓冲复合包装纸的制备方法，其特征在于：制备步骤（1）所述的复合发泡液为偶氮二甲酰胺溶于碳酸氢钠溶液中形成的复合发泡剂。
4.根据权利要求1所述一种缓冲复合包装纸的制备方法，其特征在于：制备步骤（2）所述的无机粉体为粒径800-1250目的重质碳酸钙、滑石粉、高岭土中的至少一种。
5.根据权利要求1所述一种缓冲复合包装纸的制备方法，其特征在于：制备步骤（4）所述纵向拉伸的拉伸比例为103-105:100。
6.一种缓冲复合包装纸，其特征在于：由所述权利要求1-6任意一项制备方法制得，发泡孔为针状空心泡，具有低密度、高挺度的特性。
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