CN108608696B - 一种耐穿刺、高阻隔塑料复合薄膜及包装袋 - Google Patents

一种耐穿刺、高阻隔塑料复合薄膜及包装袋 Download PDF

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CN108608696B
CN108608696B CN201810403503.1A CN201810403503A CN108608696B CN 108608696 B CN108608696 B CN 108608696B CN 201810403503 A CN201810403503 A CN 201810403503A CN 108608696 B CN108608696 B CN 108608696B
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张秉玉
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Qingdao Fangda Packaging Co ltd
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Abstract

本发明公开了一种耐穿刺、高阻隔塑料复合薄膜以及使用这种薄膜制作的包装袋，其主要成为线性低密度聚乙烯、低密度聚乙烯、茂金属聚乙烯、弹性体，经过一定程度的配比之后成为具有较优性能的聚乙烯薄膜，以这种聚乙烯薄膜作为耐穿层，另外以双向拉伸尼龙薄膜、铝箔、双向拉伸苯二甲酸乙醇酯分别作为拉伸层、阻隔层、印刷层，使用包括耐穿层、拉伸层、阻隔层、印刷层在内的多层复合膜结构达到了密封、耐穿刺、高阻隔的效果。

Description

一种耐穿刺、高阻隔塑料复合薄膜及包装袋
技术领域
本发明涉及包装袋生产技术领域，特别是涉及一种耐穿刺、高阻隔塑料复合薄膜及包装袋。
背景技术
用塑料制作包装袋一般是利用塑料膜的耐化学性好、绝缘性优，有良好的耐酸，耐碱，耐各类有机溶剂，长期放置不渗漏、不氧化的特点。但相对一些特殊的需求，普通塑料包装袋存在以下不足：
1.耐穿刺、抗冲击性能差。这是一般塑料袋的弱项，如果用于包装干货、鱼虾等水产品、冷冻品等，在包装、运输过程中容易出现穿透、破包、撕裂的问题；
2.阻隔性能不强。有的包装物不仅要求袋子能防潮、阻隔各种溶剂，而且要不透光，有反射光热的性能。这对于有透明性的普通塑料膜而言，也是难以做到的。
综上所述，现有技术中对于一种耐穿刺、高阻隔塑料复合薄膜及包装袋，需要一种高效解决方案。
发明内容
为了解决现有技术的不足，本发明提供了一种耐穿刺、高阻隔塑料复合薄膜及包装袋，其产品具有耐穿刺、抗冲击性能强的效果。
本发明提供一种加强型耐穿刺聚乙烯，其使用以下原材料经熔融共混挤出吹膜而成：
Figure BDA0001646291450000011
Figure BDA0001646291450000021
其中线性聚乙烯是常规组份；低密度聚乙烯起到调节热封温度的作用；茂金属聚乙烯增强牢固度；弹性体提高耐穿刺度和柔韧性。该膜材借助聚乙烯具有很好的热封性，特殊组份又弥补了耐穿刺性的不足，用以充当内层。所述弹性体使用苯乙烯类热塑性弹性体、聚氨酯类热塑性弹性体、聚烯烃类热塑性弹性体、聚酰胺类热塑性弹性体中的任一一种或多种。所述低密度聚乙烯密度为0.910-0.925g/cm3，所述线性低密度聚乙烯密度为0.918～0.935g/cm3，所述茂金属聚乙烯密度为0.903～0.963g/cm3。该膜材借助聚乙烯具有很好的热封性，特殊的组份又弥补了耐穿刺性的不足，用以充当内层。
本发明还提供一种耐穿刺、高阻隔塑料复合薄膜，包括多层薄膜，所述多层薄膜分别为耐穿层、拉伸层、阻隔层、印刷层；
所述耐穿层采用如权利要求1所述的加强型耐穿刺聚乙烯；
所述拉伸层采用双向拉伸尼龙薄膜；双向拉伸尼龙(聚酰胺，NY)强韧，具有良好的耐穿刺性，该材料虽没有热封性，不能做内层，但与加强型耐穿刺PE复合，优势互补，进一步增强了耐穿刺特性。
所述阻隔层采用铝箔；铝箔光热反射率高、隔热、防潮，不透光，而且能有效遮挡紫外线，大大提高其阻隔性能和抗氧化能力。
所述印刷层采用双向拉伸苯二甲酸乙醇酯，具有很强的抗张力，在印刷、复合等加工过程中不易错位，成品具有滑爽感；PET还具有良好的气密性，其隔氧性能比隔水性能优越，熔点高达264度，故阻隔氧化，保香性好，耐高温，可在很高的温度下封口。
优选的，所述耐穿层、拉伸层、铝箔层、印刷层的排列顺序为依次顺序排列，或，所述耐穿层位于中间，所述拉伸层、铝箔层、印刷层在耐穿层两侧依次对称排列。
优选的，所述印刷层与阻隔层之间、所述阻隔层与拉伸层之间，采用干法复合工艺进行复合。
优选的，所述拉伸层与所述耐穿层采用无溶剂复合，
优选的，所述印刷层在印刷时使用无苯无酮食品级油墨。
本发明还提供一种复合包装袋，采用了所述的耐穿刺、高阻隔塑料复合包装袋薄膜制作而成。
优选的，为确保耐穿刺、高阻隔性能达标，相关的材料和半成品、成品检验标准如下：
1.PET、NY、PE、AL电晕测试，良好的电晕处理，能确保印刷、复合的质量；
2.PET、NY、PE拉伸力测试；
3.PET、NY、PE摩擦系数测试；
4.NY、PE抗摆锤穿刺强度测试
5.复合后剥离强度测试
6.成品袋抗摆锤穿刺强度测试
7.成品袋虚封测试
8.成品袋渗漏测
与现有技术相比，本发明的有益效果是：
1、本发明中使用多种复合材料，耐穿刺、抗冲击性能强，如果用于包装干货、鱼虾等水产品、冷冻品等，在包装、运输过程中不容易出现穿透、破包、撕裂的问题；
2、本发明提供的阻隔性能强，使用本发明提供的袋子可以防潮、阻隔各种溶剂，而且不透光，有反射光热的性能。
具体实施方式
应该指出，以下详细说明都是例示性的，旨在对本申请提供进一步的说明。除非另有指明，本文使用的所有技术和科学术语具有与本申请所属技术领域的普通技术人员通常理解的相同含义。
需要注意的是，这里所使用的术语仅是为了描述具体实施方式，而非意图限制根据本申请的示例性实施方式。如在这里所使用的，除非上下文另外明确指出，否则单数形式也意图包括复数形式，此外，还应当理解的是，当在本说明书中使用术语“包含”和/或“包括”时，其指明存在特征、步骤、操作、器件、组件和/或它们的组合。
术语解释：
PET：双向拉伸对苯二甲酸乙醇酯；
NY：双向拉伸聚酰胺；
PE：加强型耐穿刺聚乙烯；
AL：铝箔。
实施例1
一种加强型耐穿刺聚乙烯，其使用以下原材料经熔融共混挤出吹膜而成：
Figure BDA0001646291450000041
Figure BDA0001646291450000051
其中线性聚乙烯是常规组份；低密度聚乙烯起到调节热封温度的作用；茂金属聚乙烯增强牢固度；弹性体提高耐穿刺度和柔韧性。该膜材借助聚乙烯具有很好的热封性，特殊组份又弥补了耐穿刺性的不足，用以充当内层。所述弹性体使用苯乙烯类热塑性弹性体、聚氨酯类热塑性弹性体、聚烯烃类热塑性弹性体、聚酰胺类热塑性弹性体中的任一一种或多种。所述低密度聚乙烯密度为0.910-0.925g/cm3，所述线性低密度聚乙烯密度为0.918～0.935g/cm3，所述茂金属聚乙烯密度为0.903～0.963g/cm3。
在本实施例中，乙烯组份占比65％；高压聚乙烯组份占比25％的前提下，取茂金属聚乙烯占比区间2-8％；弹性体组份占比区间2-8％当中的的三种成分组合，分别是：
1、茂金属聚2％乙烯弹性体8％；
2、茂金属聚乙烯5％弹性体5％；
3、茂金属聚8％乙烯弹性体2％；
三种组分的材料通过对比测试：第1例在耐穿测试时承受强度不足0.8牛顿，耐穿刺度不够且成本上升；第3例耐穿刺度测试时承受强度1.3牛顿，但柔韧性、热封性能不足。以第2例线性聚乙烯组份占比65％；高压聚乙烯组份占比25％，茂金属聚乙烯5％，弹性体5％的膜材，具有良好的耐穿刺、抗冲击性能、且成本控制为最佳，确定采购使用。
实施例2
一种耐穿刺、高阻隔塑料复合薄膜，包括多层薄膜，所述多层薄膜分别为耐穿层、拉伸层、阻隔层、印刷层；
所述耐穿层采用如权利要求1所述的加强型耐穿刺聚乙烯；
所述拉伸层采用双向拉伸尼龙薄膜；双向拉伸尼龙(聚酰胺，NY)强韧，具有良好的耐穿刺性，该材料虽没有热封性，不能做内层，但与加强型耐穿刺PE复合，优势互补，进一步增强了耐穿刺特性。
所述阻隔层采用铝箔；铝箔光热反射率高、隔热、防潮，不透光，而且能有效遮挡紫外线，大大提高其阻隔性能和抗氧化能力。
所述印刷层采用双向拉伸苯二甲酸乙醇酯，具有很强的抗张力，在印刷、复合等加工过程中不易错位，成品具有滑爽感；PET还具有良好的气密性，其隔氧性能比隔水性能优越，熔点高达264度，故阻隔氧化，保香性好，耐高温，可在很高的温度下封口。
所述耐穿层、拉伸层、铝箔层、印刷层的排列顺序为依次顺序排列，或，所述耐穿层位于中间，所述拉伸层、铝箔层、印刷层在耐穿层两侧依次对称排列。
所述印刷层与阻隔层之间、所述阻隔层与拉伸层之间，采用干法复合工艺进行复合。所述拉伸层与所述耐穿层采用无溶剂复合，以上操作复合后熟化温度和时间控制分别是55度24小时，55度24小时，45度36小时。
所述印刷层在印刷时使用无苯无酮食品级油墨。
实施例3
一种复合包装袋，采用了实施例2所述的耐穿刺、高阻隔塑料复合包装袋薄膜制作而成。制袋时，制袋机烫刀温度112度，制袋车速40条/分。
为确保耐穿刺、高阻隔性能达标，相关的材料和半成品、成品检验标准如下：
1、PET、NY、PE、AL电晕测试，电晕值应依次为42、42、38达因，良好的电晕处理，能确保印刷、复合的质量
2、PET、NY、PE拉伸力测试，应为大于40牛顿；
3、PET、NY、PE摩擦系数测试，分别025-0.4，0.1-0.28；
4、NY、PE抗摆锤穿刺强度测试，应为大于0.8牛顿；
5、复合后剥离强度测试，PET/AL/NY/PE三间层应为大于2.5牛顿；
6、成品袋抗摆锤穿刺强度测试，测试结果应为2.5牛顿以上。
7、成品袋虚封测试，每200个测试一次；
8、成品袋渗漏测，每2000个测试一次。
与现有技术相比，本发明的有益效果是：
1、本发明中使用多种复合材料，耐穿刺、抗冲击性能强，如果用于包装干货、鱼虾等水产品、冷冻品等，在包装、运输过程中不容易出现穿透、破包、撕裂的问题；
2、本发明提供的阻隔性能强，使用本发明提供的袋子可以防潮、阻隔各种溶剂，而且不透光，有反射光热的性能。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (7)

1.一种鱼虾包装用加强型耐穿刺聚乙烯，其特征在于，使用以下原材料经熔融共混挤出吹膜而成：
Figure FDA0002806631100000011
所述弹性体使用苯乙烯类热塑性弹性体、聚氨酯类热塑性弹性体、聚烯烃类热塑性弹性体、聚酰胺类热塑性弹性体中的任一一种或多种。
2.如权利要求1所述的一种鱼虾包装用加强型耐穿刺聚乙烯，其特征在于，所述低密度聚乙烯密度为0.910-0.925g/cm3，所述线性低密度聚乙烯密度为0.918～0.935g/cm3，所述茂金属聚乙烯密度为0.903～0.963g/cm3。
3.一种耐穿刺、高阻隔塑料复合薄膜，其特征在于，包括多层薄膜，所述多层薄膜分别为耐穿层、拉伸层、阻隔层、印刷层；
所述耐穿层采用如权利要求1所述的鱼虾包装用加强型耐穿刺聚乙烯；
所述拉伸层采用双向拉伸尼龙薄膜；
所述阻隔层采用铝箔；
所述印刷层采用双向拉伸PET；
所述耐穿层位于中间，所述拉伸层、阻隔层、印刷层在耐穿层两侧依次对称排列。
4.如权利要求3中所述的一种耐穿刺、高阻隔塑料复合薄膜，其特征在于，所述印刷层与阻隔层之间、所述阻隔层与拉伸层之间，采用干法复合工艺进行复合。
5.如权利要求3中所述的一种耐穿刺、高阻隔塑料复合薄膜，其特征在于，所述拉伸层与所述耐穿层采用无溶剂复合。
6.如权利要求3中所述的一种耐穿刺、高阻隔塑料复合薄膜，其特征在于，所述印刷层在印刷时使用无苯无酮食品级油墨。
7.一种复合包装袋，其特征在于，采用了如权利要求3～6任意一项所述的耐穿刺、高阻隔塑料复合包装袋薄膜制作而成。
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