CN105128479A - 一种不沾奶复合盖膜 - Google Patents

一种不沾奶复合盖膜 Download PDF

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CN105128479A
CN105128479A CN201510522381.4A CN201510522381A CN105128479A CN 105128479 A CN105128479 A CN 105128479A CN 201510522381 A CN201510522381 A CN 201510522381A CN 105128479 A CN105128479 A CN 105128479A
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milk
low density
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赵国途
卿前仲
陈威
宋日恒
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Stone Packaging (jiaxing) Co Ltd
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Abstract

本发明涉及一种不沾奶复合盖膜，包括本体，本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有压制层，压制层上涂布有疏水剂，本体由以下重量百分比的组分组成：低密度聚乙烯32.74～33.53％、线性低密度聚乙烯32.47～33.64％、乙烯-乙酸乙烯共聚物树脂32.83～34.79％；本发明的优点：通过低密度聚乙烯、线性低密度聚乙烯、乙烯-乙酸乙烯共聚物树脂制成的本体，使本体具备热封易揭开的特性，封口牢度适中、揭开时剥离力适中，剥离界面干净，便于压制层设置，压制层的设置，可以改变水或牛奶等液体的接触角，提高不沾的效果，疏水剂使表面具有极强的疏水、憎水、防水效果，阻隔层和印刷层的设置，使本体具有阻隔性能和印刷效果。

Description

一种不沾奶复合盖膜
技术领域
本发明涉及一种不沾奶复合盖膜。
背景技术
接触角是指在气、液、固三相交点处所作的气-液界面的切线穿过液体与固-液交界线之间的夹角θ，是润湿程度的量度。对于固体表面的水滴而言，若θ<90°，则固体表面是亲水性的，即液体较易润湿固体，其角越小，表示润湿性越好；若θ>90°，则固体表面是疏水性的，即液体不容易润湿固体，容易在表面上移动，也就是液体不容易沾在固体上面。
鲜牛奶也叫纯牛奶，呈乳白色或微黄色的均匀胶态流体，无沉淀、无凝块、无杂质、无淀粉感、无异味。酸奶是以鲜奶为原料，接种乳酸杆菌在一定条件下发酵而成的。酸奶经过发酵后，原有的乳糖部分转变成乳酸，但仍保留有部分的乳糖，所以形成特有的酸甜风味。目前市面上有凝固型和搅拌型两种酸奶，后者因为在酸性环境下，蛋白质部分变性形成凝乳。前者在此基础上，还加了少量凝乳酶，促进蛋白质凝固。两种类型的酸奶与鲜奶的营养成分没有多大差异。常温时水的粘度为0.9mPa.s，鲜牛奶的粘度为3mPa.s，酸奶的粘度则要明显高于鲜牛奶。
表面张力指液体表面任意二相邻部分之间垂直于它们的单位长度分界线相互作用的拉力。表面张力的形成同处在液体表面薄层内的分子的特殊受力状态密切相关。表面张力的存在形成了一系列日常生活中可以观察到的特殊现象。例如：截面非常小的细管内的毛细现象、肥皂泡现象、液体与固体之间的浸润与非浸润现象等。在室温(20℃左右)下，大部分液体的表面张力在20～40达因/厘米范围以内，但也有大于此数的，如水的表面张力为72达因/厘米；水银表面张力为470达因/厘米；部分牛奶的表面张力数据如下：
目前市场上常见的瓶装奶或杯装奶大多采用铝塑复合膜或镀铝复合膜来进行密封，此类复合膜采用印刷层、阻隔层与热封层通过双组份聚氨酯胶水进行复合在一起，其中热封层有聚乙烯、聚丙烯、热封胶、热熔胶等材料，或者在聚乙烯、聚丙烯等基础上进行改性的材料。聚乙烯与聚丙烯，以及其改性材料，可以采用挤出吹塑成型或者挤出流延成型，做成薄膜与相应材料复合成膜；热熔胶采用热熔涂布的方式，涂在基材上面形成热封层；热封胶因为是乳液形式，需要通过网纹辊涂布在基材上再经过高温烘干以后才能形成热封层，以上不同的热封材料形成热封膜以后，都是一层树脂层，其表面不管是平滑的还是压出一定的花纹，牛奶类粘稠液体因为表面张力没有足够大，所以都很容易粘附在上面，尤其是酸奶类产品，粘在膜上形成一层厚厚的奶膜，如果插吸管喝则会无法吃到该层粘附的酸奶，造成较多浪费，如果揭开封口膜将粘附在封口膜内表面的酸奶用舌头舔掉，一方面比较麻烦，另外一方面也很不雅观。
发明内容
本发明要解决的技术问题就是提供一种不沾奶复合盖膜，可以很好的解决现有瓶装奶用复合膜存在的问题。
为了解决上述技术问题，本发明是通过以下技术方案实现的：一种不沾奶复合盖膜，包括本体，由外到内所述本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有一层使热封层表面呈现凹凸不平结构的压制层，压制层上涂布有一层疏水剂，复合层外侧壁的表面张力为38～42达因，本体由以下重量百分比的组分组成：低密度聚乙烯32.74～33.53％、线性低密度聚乙烯32.47～33.64％、乙烯-乙酸乙烯共聚物树脂32.83～34.79％。
优选的，本体由以下重量百分比的组分组成：低密度聚乙烯32.74％、线性低密度聚乙烯32.47％、乙烯-乙酸乙烯共聚物树脂34.79％，制成的本体具有封口牢度适中、揭开时剥离力适中，剥离界面干净。
优选的，本体由以下重量百分比的组分组成：低密度聚乙烯33％、线性低密度聚乙烯33％、乙烯-乙酸乙烯共聚物树脂34％，制成的本体具有封口牢度适中、揭开时剥离力适中，剥离界面干净。
优选的，本体由以下重量百分比的组分组成：低密度聚乙烯33.53％、线性低密度聚乙烯33.64％、乙烯-乙酸乙烯共聚物树脂32.83％，制成的本体具有封口牢度适中、揭开时剥离力适中，剥离界面干净。
优选的，在温度190℃，荷重2.16kg时，低密度聚乙烯的熔融指数为每十分钟流出1.75～2.06g，线性低密度聚乙烯的熔融指数为每十分钟流出2.32～2.51g，乙烯-丙烯酸酯共聚物树脂的熔融指数为每十分钟流出30.94～34.05g，将乙烯-丙烯酸酯共聚物树脂的熔融指数设置成30.94～34.05，可以保证对其加热后在热封层上压制出压制层，可以改变水或牛奶等液体的接触角，提高不沾的效果。
优选的，复合层、基层、热封层的厚度比为1:1:1，整体的结构稳定，连接可靠，使用效果好。
优选的，阻隔层为铝箔，阻隔层与本体的厚度比为1:2，阻隔层通过粘合剂粘合在复合层上，铝箔阻隔性能好，保证了印刷层的设置，保证了印刷层中的印刷图案显示，使用效果好，粘合剂粘合效果好。
优选的，疏水剂在压制层上的厚度为3～7μm，保证了热封层的热封效果，当疏水剂在压制层上的厚度小于3μm时，防水效果差，疏水剂易磨损，当疏水剂在压制层上的厚度大于7μm时，大大的降低了热封层的热封效果。
综上所述，本发明的优点：通过低密度聚乙烯、线性低密度聚乙烯、乙烯-乙酸乙烯共聚物树脂制成的本体，使本体具备热封易揭开的特性，封口牢度适中、揭开时剥离力适中，剥离界面干净，便于压制层设置，压制层的设置，可以改变水或牛奶等液体的接触角，提高不沾的效果，疏水剂使表面具有极强的疏水、憎水、防水效果，阻隔层和印刷层的设置，使本体具有阻隔性能和印刷效果，提高了使用寿命。
具体实施方式
实施例一：
一种不沾奶复合盖膜，包括本体，由外到内所述本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有一层使热封层表面呈现凹凸不平结构的压制层，压制层上涂布有一层疏水剂，复合层外侧壁的表面张力为38～42达因，本体由以下重量百分比的组分组成：低密度聚乙烯32.74％、线性低密度聚乙烯32.47％、乙烯-乙酸乙烯共聚物树脂34.79％，在温度190℃，荷重2.16kg时，低密度聚乙烯的熔融指数为每十分钟流出1.8g，线性低密度聚乙烯的熔融指数为每十分钟流出2.35g，乙烯-丙烯酸酯共聚物树脂的熔融指数为每十分钟流出31.5g，可以保证对其加热后在热封层上压制出压制层，可以改变水或牛奶等液体的接触角，提高不沾的效果，复合层、基层、热封层的厚度比为1:1:1，整体的结构稳定，连接可靠，使用效果好，阻隔层为铝箔，阻隔层与本体的厚度比为1:2，阻隔层通过粘合剂粘合在复合层上，铝箔阻隔性能好，保证了印刷层的设置，保证了印刷层中的印刷图案显示，使用效果好，粘合剂粘合效果好，疏水剂在压制层上的厚度为5μm，保证了热封层的热封效果。
实施例二：
一种不沾奶复合盖膜，包括本体，由外到内所述本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有一层使热封层表面呈现凹凸不平结构的压制层，压制层上涂布一层疏水剂，复合层外侧壁的表面张力为38～42达因，本体由以下重量百分比的组分组成：低密度聚乙烯33％、线性低密度聚乙烯33％、乙烯-乙酸乙烯共聚物树脂34％，在温度190℃，荷重2.16kg时，低密度聚乙烯的熔融指数为每十分钟流出1.9g，线性低密度聚乙烯的熔融指数为每十分钟流出2.4g，乙烯-丙烯酸酯共聚物树脂的熔融指数为每十分钟流出32g，疏水剂在压制层上的厚度为3.5μm，保证了热封层的热封效果。
实施例三：
一种不沾奶复合盖膜，包括本体，由外到内所述本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有一层使热封层表面呈现凹凸不平结构的压制层，压制层上涂布一层疏水剂，复合层外侧壁的表面张力为38～42达因，本体由以下重量百分比的组分组成：低密度聚乙烯33.53％、线性低密度聚乙烯33.64％、乙烯-乙酸乙烯共聚物树脂32.83％，在温度190℃，荷重2.16kg时，低密度聚乙烯的熔融指数为每十分钟流出1.96g，线性低密度聚乙烯的熔融指数为每十分钟流出2.47g，乙烯-丙烯酸酯共聚物树脂的熔融指数为每十分钟流出33.75g，疏水剂在压制层上的厚度为6.25μm，保证了热封层的热封效果。
通过低密度聚乙烯、线性低密度聚乙烯、乙烯-乙酸乙烯共聚物树脂制成的本体，使本体具备热封易揭开的特性，封口牢度适中、揭开时剥离力适中，剥离界面干净，便于压制层设置，压制层的设置，可以改变水或牛奶等液体的接触角，提高不沾的效果，疏水剂使表面具有极强的疏水、憎水、防水效果，阻隔层和印刷层的设置，使本体具有阻隔性能和印刷效果，提高了使用寿命。

Claims (8)

1.一种不沾奶复合盖膜，包括本体，其特征在于：由外到内所述本体依次设有复合层、基层、热封层，复合层上设有阻隔层和印刷层，热封层上设有一层使热封层表面呈现凹凸不平结构的压制层，压制层上涂布有一层疏水剂，复合层外侧壁的表面张力为38～42达因，本体由以下重量百分比的组分组成：低密度聚乙烯32.74～33.53％、线性低密度聚乙烯32.47～33.64％、乙烯-乙酸乙烯共聚物树脂32.83～34.79％。
2.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：本体由以下重量百分比的组分组成：低密度聚乙烯32.74％、线性低密度聚乙烯32.47％、乙烯-乙酸乙烯共聚物树脂34.79％。
3.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：本体由以下重量百分比的组分组成：低密度聚乙烯33％、线性低密度聚乙烯33％、乙烯-乙酸乙烯共聚物树脂34％。
4.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：本体由以下重量百分比的组分组成：低密度聚乙烯33.53％、线性低密度聚乙烯33.64％、乙烯-乙酸乙烯共聚物树脂32.83％。
5.根据权利要求1至4任一种所述的一种不沾奶复合盖膜，其特征在于：在温度190℃，荷重2.16kg时，低密度聚乙烯的熔融指数为每十分钟流出1.75～2.06g，线性低密度聚乙烯的熔融指数为每十分钟流出2.32～2.51g，乙烯-丙烯酸酯共聚物树脂的熔融指数为每十分钟流出30.94～34.05g。
6.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：复合层、基层、热封层的厚度比为1:1:1。
7.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：阻隔层为铝箔，阻隔层与本体的厚度比为1:2，阻隔层通过粘合剂粘合在复合层上。
8.根据权利要求1所述的一种不沾奶复合盖膜，其特征在于：疏水剂在压制层上的厚度为3～7μm。
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CN110035888A (zh) * 2016-12-16 2019-07-19 斯道拉恩索公司 具有微图案的产品和生产所述产品的方法
CN108190235A (zh) * 2018-02-24 2018-06-22 江苏申凯包装高新技术股份有限公司 一种不粘酸奶盖膜
CN109291570A (zh) * 2018-10-18 2019-02-01 浙江金石包装有限公司 一种用于后发酵酸奶的聚苯乙烯塑杯封口膜及其制备方法
CN109533645A (zh) * 2018-11-23 2019-03-29 金华市伸华包装材料有限公司 一种高强度不粘奶封盖膜及其生产工艺
CN112267327A (zh) * 2020-10-26 2021-01-26 浙江金石包装有限公司 一种不沾奶复合材料及不沾奶纸杯
CN114572479A (zh) * 2020-12-01 2022-06-03 内蒙古蒙牛乳业（集团）股份有限公司 一种具有疏水涂层的盖膜的封合工艺
CN114561054A (zh) * 2022-02-24 2022-05-31 金发科技股份有限公司 一种耐油非交联聚乙烯材料及其制备和应用
CN114561054B (zh) * 2022-02-24 2023-10-31 金发科技股份有限公司 一种耐油非交联聚乙烯材料及其制备和应用

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