CN115464957B - 一种特殊消光效果复合包装材料及其制备方法 - Google Patents
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Abstract
本发明涉及特殊消光效果复合包装材料及其制备方法，属于包装材料技术领域。该包装材料为复合膜，复合膜由外到内依次为：BOPP层、改性PE层以及改性EVA层，改性改性PE层由高压低密度聚乙烯树脂和线性茂金属聚乙烯树脂通过共挤出涂覆生产工艺制成；改性EVA层由第一乙烯‑醋酸乙烯共聚物和第二乙烯‑醋酸乙烯共聚物通过共挤出涂覆生产工艺制成。本发明制备复合包装材料通过材料选型、配方筛选、挤出涂布工艺优化等，实现了包装材料在软包装生产工艺中未使用消光BOPP薄膜材料的情况下也可以具备消光效果。
Description
技术领域
本发明涉及包装材料技术领域，特别是一种特殊消光效果复合包装材料及其制备方法。
背景技术
消光BOPP薄膜是指在薄膜生产过程中会在薄膜表面形成均匀的粗化面，照射到该粗化表面的自然光将大量发生漫反射，从而起到消除薄膜表面光泽的作用，形成一种高雾度、低光泽度、具有呈漫反射状消光效果的包装用膜，其外观和质感似纸张，手感也舒适，在光线照射下，给人以柔和的视感以及一种奢华的感觉，通过消光薄膜复合后包装材料广泛地应用于肥皂、酒类、服装、化妆品、药品等方面。
目前消光BOPP膜的生产工艺是薄膜生产过程中，通过添加一定比例消光母料在表层作为消光层，消光母料可以提升制膜时的结晶度，提高了薄膜的表面粗糙度和雾度，以此提供薄膜的消光功能和消光效果，其对应表面就称之为消光面，从而制造的薄膜就是消光BOPP薄膜。
现有的消光效果的复合包装材料一般是由消光BOPP薄膜复合热封层聚乙烯薄膜组成(材质结构：消光BOPP/PE)。由于现有消光BOPP薄膜生产中会添加消光母粒，但是消光母粒与聚丙烯粒料之间的混合均匀性、相容性较差，这样会经常造成在生产消光BOPP薄膜时，其表面粗糙层破裂或产生气穴，进而产生亮点，也称为白点或银点，因而容易造成使用了消光BOPP薄膜生产的复合包装材料的表面也会有这类亮点或银点的瑕疵出现。
发明内容
为了解决上述技术问题，本发明提供一种特殊消光效果复合包装材料及其制备方法，该包装材料不仅具有消光效果，且表面不会出现亮点或银点等。
为了实现本发明的目的，本发明采用了以下技术方案：
一种特殊消光效果复合包装材料，该包装材料为复合膜，复合膜由外到内依次为：BOPP层、改性PE层以及改性EVA层，改性改性PE层由高压低密度聚乙烯树脂和线性茂金属聚乙烯树脂通过共挤出涂覆生产工艺制成；改性EVA层由第一乙烯-醋酸乙烯共聚物和第二乙烯-醋酸乙烯共聚物通过共挤出涂覆生产工艺制成。
优选的，改性PE层由高压低密度聚乙烯树脂和线性茂金属聚乙烯树脂按重量比为7∶3通过共挤出涂覆生产工艺制成。
优选的，改性EVA层由第一乙烯-醋酸乙烯共聚物和第一乙烯-醋酸乙烯共聚物按一定比例组成，第一乙烯-醋酸乙烯共聚物的为牌号为美国杜邦公司生产的Appeel53009，第二乙烯-醋酸乙烯共聚物的牌号为日本东洋纺公司生产生产的L-3388。
优选的，第一乙烯-醋酸乙烯共聚物与第二乙烯-醋酸乙烯共聚物的重量比为(55-65)∶(35-45)。
优选的，高压低密度聚乙烯树脂的牌号为美国陶氏化学公司生产的722；线性茂金属聚乙烯树脂的牌号为日本三井化学公司生产的SP1071C。
本发明目的之二是提供一种特殊消光效果复合包装材料的制备方法，该制备方法包括如下步骤：
S1、先将BOPP基材经过涂布段涂布挤复增粘剂，再通过烘道进入硅橡胶辊和冷却钢辊之间，同时按照重量比混合好PE树脂，通过共挤出设备的第一挤出单元，粒料由进料段依次输送至挤复螺杆的进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，均匀涂覆分布在BOPP基材的表面，在压力的作用下热熔膜与BOPP基材贴合在一起，由镜面辊冷却定型后，形成BOPP/改性PE复合膜，进入到挤出设备的第二挤出单元；
S2、通过第一挤出单元牵引处理的BOPP/改性PE复合膜，经设备运行牵引，进入到第二挤出单元，按照重量比混合好EVA树脂，由进料段输送至挤复螺杆的进料段、压缩段、熔融段、混炼段和均化段，再通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在BOPP/改性PE复合膜的表面，在压力的作用下热熔膜与第一挤出单元挤出的BOPP/改性PE复合膜贴合在一起，由麻面辊冷却定型后，通过切除废边，最后将挤出复合膜绕于收巻轴轴芯上，制得BOPP/改性PE/改性EVA复合膜。
优选的，步骤S1中第一挤出部分的改性PE的机筒加工温度为：220℃/270℃/310℃/320℃/330℃/330℃/325℃/325℃；模头加工温度为：320℃/325℃/325℃/330℃/330℃/330℃/325℃/325℃/320℃。
优选的，步骤S1中第二挤出部分的所述改性EVA的机筒加工温度为：210℃/250℃/265℃/280℃/280℃/280℃/285℃/285℃；模头加工温度为：280℃/285℃/285℃/290℃/290℃/290℃/285℃/285℃/280℃。
从树脂进入后，机筒分成几段的，每段的加工温度不一样，进料段用于输送物料，防止溢料；压缩段使物料各组分进行均匀分布与分散性混炼性混合加工的功能；熔融段通过热传递和摩擦剪切，使物料充分熔融和均化；混炼段使物料组分进一步细化与均匀，分布性与分散性混合功能；均化段用于物料的输送和增压，使模口处物料有一定的致密度，同时进一步混合。
优选的，挤复增粘剂的牌号为上海DIC公司生产的EP108。
优选的，步骤S2中所述麻面辊的粗糙度Rz为0.6。
本发明相比现有技术的有益效果在于：
(1)本发明制备复合包装材料通过材料选型、配方筛选、挤出涂布工艺优化等，实现了包装材料在软包装生产工艺中未使用消光BOPP薄膜材料的情况下也可以具备消光效果，且在保证其他性能的情况下消光效果相对于现有软包装消光材料更佳；同时本发明规避了常规消光BOPP薄膜材料容易产生亮点(白点或银点)的弊端，降低了生产成本，使得生产工艺更加可控，实满足市场需求。
(2)本发明的双向拉伸聚丙烯薄膜层(BOPP层)主要用做承印物，可以根据要求印刷各种彩色图案，同时还具有耐高温、能够适应高速印刷的要求；改性PE层的高压低密度聚乙烯树脂牌号为美国陶氏化学高度生产的722是，采用独特的陶氏化学聚合技术生产的高压低密度聚乙烯树脂，具有优异的透明性和挺度、密度特性及优异的加工适性，为共挤出加工膜结构提供高刚性、挺度、耐冲击性能及其光泽度；线性茂金属聚乙烯树脂的牌号为日本三井化学公司生产的SP1071C，具有较低的熔点和明显的熔区，在韧性和热粘性方面等有显著的特性，并且和同类涂敷级茂金属聚乙烯相比,有更好的加工性和更低的缩径；改性EVA层的第一乙烯-醋酸乙烯共聚物的牌号为美国杜邦公司生产的Appeel53009，在其聚合加工中在分子链中引入了醋酸乙烯单体，从而降低了结晶度，提高了柔韧性、抗冲击性、相溶性、热稳定性和热密封性，并且具有优异的加工性能；第二乙烯-醋酸乙烯共聚物的牌号为日本东洋纺公司生产的L-3388，其具有更加优异的热粘性、相溶性，以及其低的维卡软化点，更加有利于加工成膜性能。
(3)本发明的核心是通过功能性粒料的选型以及涂覆加工工艺来实现，通过不同性能树脂的维卡软化点温度的差别，在共挤出加工中形成不同的膜面状态，并且涂覆淋膜与具有麻面效果的冷却辊(麻面辊)，形成消光雾面效果的复合包装材料，同时第一挤出涂覆工序中采用的镜面辊可以增加产品的光泽度。
附图说明
图1是本发明的流程图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图和实施例，对本发明进行进一步详细说明，基于本发明中的实施例，本领域普通技术人员在没有做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
S1、称取70质量份的高压低密度聚乙烯树脂和30质量份的线性茂金属聚乙烯树脂，由进料段依次输送至挤复螺杆的进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，均匀涂覆分布在BOPP基材的表面，在压力的作用下热熔膜与BOPP基材贴合在一起，由镜面辊冷却定型后，形成BOPP/改性PE复合膜，进入到挤出设备的第二挤出单元；
S2、称取60质量份的乙烯-醋酸乙烯共聚物树脂和40质量份的乙烯-醋酸乙烯共聚物树脂，由进料段输送至挤复螺杆进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在BOPP/改性PE复合膜的表面，在压力的作用下热熔膜与第一挤出单元挤出的BOPP/改性PE复合膜贴合在一起，由麻面辊冷却定型后，通过切除废边，最后将挤出复合膜绕于收巻轴轴芯上，制得BOPP/改性PE/改性EVA复合膜。
实施例2
S1、称取70质量份的高压低密度聚乙烯树脂和30质量份的线性茂金属聚乙烯树脂，由进料段依次输送至挤复螺杆的进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，均匀涂覆分布在BOPP基材的表面，在压力的作用下热熔膜与BOPP基材贴合在一起，由镜面辊冷却定型后，形成BOPP/改性PE复合膜，进入到挤出设备的第二挤出单元；
S2、称取55质量份的乙烯-醋酸乙烯共聚物树脂和45质量份的乙烯-醋酸乙烯共聚物树脂，由进料段输送至挤复螺杆进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在BOPP/改性PE复合膜的表面，在压力的作用下热熔膜与第一挤出单元挤出的BOPP/改性PE复合膜贴合在一起，由麻面辊冷却定型后，通过切除废边，最后将挤出复合膜绕于收巻轴轴芯上，制得BOPP/改性PE/改性EVA复合膜。
实施例3
SS1、称取70质量份的高压低密度聚乙烯树脂和30质量份的线性茂金属聚乙烯树脂，由进料段依次输送至挤复螺杆的进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，均匀涂覆分布在BOPP基材的表面，在压力的作用下热熔膜与BOPP基材贴合在一起，由镜面辊冷却定型后，形成BOPP/改性PE复合膜，进入到挤出设备的第二挤出单元；
S2、称取65质量份的乙烯-醋酸乙烯共聚物树脂和35质量份的乙烯-醋酸乙烯共聚物树脂，由进料段输送至挤复螺杆进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在BOPP/改性PE复合膜的表面，在压力的作用下热熔膜与第一挤出单元挤出的BOPP/改性PE复合膜贴合在一起，由麻面辊冷却定型后，通过切除废边，最后将挤出复合膜绕于收巻轴轴芯上，制得BOPP/改性PE/改性EVA复合膜。
以上实施例1-3中的中，改性EVA层由第一乙烯-醋酸乙烯共聚物和第一乙烯-醋酸乙烯共聚物按组成，第一乙烯-醋酸乙烯共聚物的为牌号为美国杜邦公司生产的Appeel53009，第二乙烯-醋酸乙烯共聚物的牌号为日本东洋纺公司生产生产的L-3388；高压低密度聚乙烯树脂的牌号为美国陶氏化学公司生产的722；线性茂金属聚乙烯树脂的牌号为日本三井化学公司生产的SP1071C，具体的工艺参数如下表1：
表1
对比例1
S1、称取100质量份的高压低密度聚乙烯树脂，由进料段输送入挤复螺杆进料段、压缩段、熔融段，在通过连接段进入模头，由模头模口挤出形成热熔膜，涂覆均匀分布在基材的表面，在压力的作用下热熔膜与待复基材贴合在一起，由冷却辊冷却定型后，形成了BOPP/PE，进入到挤出设备的第二段共挤出部分；
S2、称取100质量份的高压低密度聚乙烯树脂，由进料段输送入挤复螺杆进料段、压缩段、熔融段，在通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在基材的表面，在压力的作用下热熔膜与一挤出的基材贴合在一起，由冷却辊冷却定型后，通过切除废边后，最后将挤出复合膜绕于收巻轴轴芯上，形成BOPP/PE/PE的共挤出涂覆包装材料。
对比例2
外购的消光BOPP薄膜，通过挤出复合工艺与内层PE薄膜，进行挤出复合后，形成材质为消光BOPP/挤PE/PE膜。(此材质是常规的消光复合包装材质结构，用于与本发明进行性能对比)。
表1实施例1-3和对比例1、2的性能测试结果
由表1的测试结果可知：实施例1-3制得的复合包装材料的雾度在80.1％-81.8％，光泽度在10.5％-11.2％，对比例1制得的复合包装材料的雾度为11.4％，光泽度为6.6％；对比例2制得的复合包装材料的雾度为78.6％，光泽度为9.9％，即对比例1和对比例2制得的复合包装材料的雾度和光泽度均远远低于实施例1-3制得的复合包装材料的雾度和光泽度；
由此可以表明采用本发明制备工艺制得的BOPP/改性PE/改性EVA共挤出涂覆结构的复合包装材料，有着普通复合包装材料不具备的消光效果和性能，以及在性能和效果上等同于甚至更好于现有常规的消光复合包装材质结构；本发明规避了常规消光BOPP薄膜材料容易产生亮点(白点或银点)的弊端，降低了生产成本，生产工艺更加可控，实现了一种全新的特殊消光效果复合包装材料，满足市场需求，受到消费者和客户的青睐。
本领域的技术人员应理解，以上所述仅为本发明的若干个具体实施方式，而不是全部实施例。应当指出，对于本领域的普通技术人员来说，还可以做出许多变形和改进，所有未超出权利要求所述的变形或改进均应视为本发明的保护范围。
Claims (9)
1.一种特殊消光效果复合包装材料，其特征在于，该包装材料为复合膜，所述复合膜由外到内依次为：BOPP层、改性PE层以及改性EVA层，所述改性PE层由高压低密度聚乙烯树脂和线性茂金属聚乙烯树脂通过共挤出涂覆生产工艺制成；所述改性EVA层由第一乙烯-醋酸乙烯共聚物和第二乙烯-醋酸乙烯共聚物通过共挤出涂覆工艺制成；
所述改性EVA层由第一乙烯-醋酸乙烯共聚物和第二乙烯-醋酸乙烯共聚物按一定比例组成，所述第一乙烯-醋酸乙烯共聚物的牌号为美国杜邦公司生产的Appeel 53009，所述第二乙烯-醋酸乙烯共聚物的牌号为日本东洋纺公司生产生产的L-3388。
2.根据权利要求1所述的特殊消光效果复合包装材料，其特征在于，所述改性PE层由高压低密度聚乙烯树脂和线性茂金属聚乙烯树脂按重量比为7∶3通过共挤出涂覆生产工艺制成。
3.根据权利要求1所述的特殊消光效果复合包装材料，其特征在于，所述第一乙烯-醋酸乙烯共聚物与第二乙烯-醋酸乙烯共聚物的重量比为(55-65)∶(35-45)。
4.根据权利要求1所述的一种特殊消光效果复合包装材料，其特征在于，所述高压低密度聚乙烯树脂的牌号为美国陶氏化学公司生产的722；所述线性茂金属聚乙烯树脂的牌号为日本三井化学公司生产的SP1071C。
5.一种如权利要求1-4所述的特殊消光效果复合包装材料的制备方法，其特征在于，该制备方法包括如下步骤：
S1、先将BOPP基材经过涂布段涂布挤复增粘剂，再通过烘道进入硅橡胶辊和冷却钢辊之间，同时按照重量比混合好PE树脂，通过共挤出设备的第一挤出单元，粒料由进料段依次输送至挤复螺杆的进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，均匀涂覆分布在BOPP基材的表面，在压力的作用下热熔膜与BOPP基材贴合在一起，由镜面辊冷却定型后，形成BOPP/改性PE复合膜，进入到挤出设备的第二挤出单元；
S2、通过第一挤出单元牵引处理的BOPP/改性PE复合膜，经设备运行牵引，进入到第二挤出单元，按照重量比混合好EVA树脂，由进料段输送至挤复螺杆进料段、压缩段、熔融段，再通过连接段进入模头，由模头模口挤出形成热熔膜，淋入硅橡胶辊和冷却钢辊之间，均匀涂覆分布在BOPP/改性PE复合膜的表面，在压力的作用下热熔膜与第一挤出单元挤出的BOPP/改性PE复合膜贴合在一起，由麻面辊冷却定型后，通过切除废边，最后将挤出复合膜绕于收巻轴轴芯上，制得BOPP/改性PE/改性EVA复合膜。
6.根据权利要求5所述的特殊消光效果复合包装材料的制备方法，其特征在于，步骤S1中第一挤出部分的所述改性PE的机筒加工温度为：220℃/270℃/310℃/320℃/330℃/330℃/325℃/325℃；模头加工温度为：320℃/325℃/325℃/330℃/330℃/330℃/325℃/325℃/320℃。
7.根据权利要求5所述的特殊消光效果复合包装材料的制备方法，其特征在于，步骤S1中第二挤出部分的所述改性EVA的机筒加工温度为：210℃/250℃/265℃/280℃/280℃/280℃/285℃/285℃；模头加工温度为：280℃/285℃/285℃/290℃/290℃/290℃/285℃/285℃/280℃。
8.根据权利要求5所述的特殊消光效果复合包装材料的制备方法，其特征在于，所述挤复增粘剂的牌号为上海DIC公司生产的EP108。
9.根据权利要求5所述的特殊消光效果复合包装材料的制备方法，其特征在于，步骤S2中所述麻面辊的粗糙度Rz为0.6。
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| CN108032568A (zh) * | 2017-12-07 | 2018-05-15 | 黄山永新股份有限公司 | 一种高避光高阻隔液体包装膜及其生产方法 |
| CN113059879A (zh) * | 2021-04-13 | 2021-07-02 | 黄山永新股份有限公司 | 一种适用于凹版印刷的消光聚乙烯薄膜及其制备工艺 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105479884A (zh) * | 2015-12-25 | 2016-04-13 | 广东德冠包装材料有限公司 | 双向拉伸聚丙烯预涂膜基材及其制备方法和应用 |
| CN106827750A (zh) * | 2016-12-23 | 2017-06-13 | 广东德冠薄膜新材料股份有限公司 | 含有乙烯‑醋酸乙烯共聚物树脂层的聚丙烯薄膜及其制备方法 |
| CN108032568A (zh) * | 2017-12-07 | 2018-05-15 | 黄山永新股份有限公司 | 一种高避光高阻隔液体包装膜及其生产方法 |
| CN113059879A (zh) * | 2021-04-13 | 2021-07-02 | 黄山永新股份有限公司 | 一种适用于凹版印刷的消光聚乙烯薄膜及其制备工艺 |
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