CN115027118A - 纸、塑、pva涂覆pet镀铝膜复合无菌包装材料及其制备方法 - Google Patents

纸、塑、pva涂覆pet镀铝膜复合无菌包装材料及其制备方法 Download PDF

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CN115027118A
CN115027118A CN202210587036.9A CN202210587036A CN115027118A CN 115027118 A CN115027118 A CN 115027118A CN 202210587036 A CN202210587036 A CN 202210587036A CN 115027118 A CN115027118 A CN 115027118A
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马磊
马龙升
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Hebei Dawoxing Packaging Technology Co ltd
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Abstract

本发明提供了一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料及其制备方法，属于纸塑铝复合包装材料技术领域。本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其自上向下依次包括第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层。其中纸层占所述复合无菌包装材料重量的70～75％，以PET镀铝膜代替铝箔层，保证了灌装工艺需要铝高频传导热量的要求。涂覆PVA同时提高了产品的密封阻隔性，因减去了铝箔层使该产品因铝在环境中不可回收，使其更符合环保要求，同时降低了原材料成本，生产工艺简单，生产效率高。

Description

纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料及其制备方法
技术领域
本发明涉及纸塑铝复合包装材料技术领域，尤其涉及一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料及其制备方法。
背景技术
纸塑铝复合包装材料，是指包装饮料及乳制品储存期在六个月以上的多层复合材料。在市场上能看到的有砖型、枕型、屋顶型、三角型的。另外最新发展的还有六角型圆罐型的。纸塑铝复合包装材料现被广泛应用于液体食品无菌包装，能够赋于包装一定的外形，有效的防漏，阻氧、阻隔水汽，使得内容物在无需冷臧的条件下获得较长的产品保质期。纸塑铝复合包装材料的应用量巨大。
中国专利CN106364104A公开了一种纸铝塑复合无菌包装材料，包括铝箔，在所述铝箔的一面淋膜有第一粘合层，在铝箔的另一面依次淋膜有第二粘合层和聚乙烯热封层，在所述第一粘合层远离铝箔的一面粘合有纸质层，所述纸质层为不能直接提供印刷所需白度和平滑度指标的纸，在所述纸质层远离第一粘合层的一面设置有有色聚烯烃层。
中国专利CN102896857A公开了一种纸基铝塑复合材料，由相互粘合在一起的十二层材料构成，按由外向内的顺序依次为：改性聚乙烯、聚乙烯、油墨层、塑料薄膜、直镀铝层、粘接树脂、纸张、聚乙烯、粘接树脂、铝箔、粘接树脂和改性聚乙烯。
但是上述方法制备的复合材料，均添加了铝箔，不仅成本高，且不能降解，环境污染严重。
发明内容
有鉴于此，本发明提供了一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料。该复合无菌包装材料能很好的阻挡液体的渗透，并且能延长产品的保质期，且降低制作成本。
本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其自上向下依次包括第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层。
优选的，所述第一聚乙烯层的厚度为9～11μm；第二纸层的厚度为255～265μm；第三聚乙烯层的厚度为15～18μm，第四涂布PVA高阻隔材料层的厚度为2～3μm；第五PET镀铝膜层的厚度为10～12μm；第六粘合树脂层的厚度为5～7μm；第七聚乙烯层的厚度为23～27μm。
优选的，所述纸、塑、PVA涂覆镀铝膜复合无菌包装材料的氧气透过量为1～5cm3/m2·24h·1mpa；水蒸渗透过量为0.6～0.7g/m2·24h。
优选的，所述第一聚乙烯层、第三聚乙烯层、第七聚乙烯层均为低密度聚乙烯或茂金属聚乙烯中的任意一种或两种。
优选的，所述粘合树脂层的具体成分为乙烯-丙烯酸共聚物粘合树脂或酸酐改性的乙烯-醋酸乙烯粘合树脂中的任意一种。
优选的，所述纸层为耐折度大于350次，挺度纵向≥5.8mn.m，横向≥2.3mn.m，边渗≤0.8kg/m2，白度≤1.0％的无菌纸。
优选的，所述纸层占所述复合无菌包装材料重量的70～75％。
优选的，所述涂布PVA高阻隔材料层的具体成分为：纳米改性聚乙烯醇涂布液；所述纳米改性聚乙烯醇涂布液由纳米层状高岭土和聚乙烯醇按照0.5～1:10～15的质量比构成。
本发明的另一目的是提供一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料的制备方法，包括以下步骤：
(1)制备纳米改性聚乙烯醇涂布液：将聚乙烯醇粉状颗粒在85～95℃的水中溶解后加入纳米层状高岭土经反应釜高速剪切2.5～3小时后，让纳米高岭土片状晶体互相穿插叠加，形成纳米改性聚已烯醇涂布液；
(2)将步骤(1)制备的纳米改性聚乙烯醇涂布液经涂布机涂覆PET镀铝膜表面，干燥后在PET镀铝膜层上形成涂布PVA高阻隔材料层；
(3)将无菌纸经凹版纸张印刷机或卫星式柔板印刷机印刷图案，形成带有文字及图案的纸层；
(4)按照第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层的顺序，将步骤(2)制备的PET镀铝膜层和涂布PVA高阻隔材料层与其他结构经多层共挤挤出复合形成所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料。
与现有技术相比，本发明具有以下有益效果：
1、本发明制备的复合无菌包装材料中纸占其成分重量比为70％-75％左右，易于降解，便于灌装成型，产品外观印刷精美，货架展示利于消费审美，产品具有高阻隔性，包装内容物品保质期长，密封性好，保持内容物的原有风味。
2、本发明将纳米高岭土片状插层工艺制备而成的涂布液，经涂覆工艺干燥后具有与铝箔同等阻隔性能的高分子材料，但同等面积的聚乙烯醇(PVA)涂层，只有铝箔层的重量比的二十分之一。使产品更加轻量化，从造价成本上比只相当于铝箔层的二十分之一，最主要的是聚乙烯醇可溶于水，易于分解，对环境没有污染，而铝箔不能降解，环境污染严重。
3、本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料去除铝箔层，使其厚度较薄，更加轻量化，具有高阻隔性能，利于环保而且便于使用，从而更加实用。
4、本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料具绿色环保，无毒、无害、减少环境污染，将在目前的国内外包装行业具有极强的市场竞争力，市场前景十分广阔。
本发明利用纳米改性聚已烯醇涂布液涂覆的PET镀铝膜性能优越，聚乙烯醇涂布液基本上不采用增塑剂、交联剂、抗氧剂、催化剂等助剂，有效的提高了PVA的纯度，增加薄膜的致密性，从而提高了薄膜的阻隔性能，利用纳米层状高岭土改性聚乙烯醇涂布液，进一步增强了薄膜的对氧气、水蒸气等物质的阻隔性能，利用PET薄膜良好的柔韧性增加薄膜的耐穿刺性，有效的保护了加入纳米层状高岭土的PVA涂层，进一步提高气体阻隔效果，有效的降低了氧气、水蒸气的透过量，以PET镀铝膜代替铝箔层，保证了灌装工艺高频传导热量的要求，又保证了产品的密封阻隔性，降低了原材料成本，生产工艺简单，生产效率高。
附图说明
图1为本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料的结构示意图；
图1中序号1表示第一聚乙烯层、2表示第二纸层、3表示第三聚乙烯层、4表示第四涂布PVA高阻隔材料层、5表示第五PET镀铝膜层、6表示第六粘合树脂层、7表示第七聚乙烯层。
具体实施方式
下面结合实施例对本发明作进一步说明。
实施例1
一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其自上向下依次由以下结构构成：
厚度为11μm的第一聚乙烯层；
厚度为255μm的第二纸层；
厚度为15μm的第三聚乙烯层；
厚度为2μm的第四涂布PVA高阻隔材料层；
厚度为10μm的第五PET镀铝膜层；
厚度为6μm的第六粘合树脂层；
厚度为25μm的第七聚乙烯层。
所述第一聚乙烯层、第三聚乙烯层、第七聚乙烯层均为低密度聚乙烯。
所述纸层为为耐折度大于350次，挺度纵向≥5.8mn.m，横向≥2.3mn.m，边渗≤0.8kg/m2，白度≤1.0％的无菌纸；所述纸层占所述复合无菌包装材料重量的72％。
所述纸、塑、PVA涂覆镀铝膜复合无菌包装材料的制备方法，步骤如下：
(1)制备纳米改性聚乙烯醇涂布液：将聚乙烯醇粉状颗粒在90℃的水中溶解后加入纳米层状高岭土经反应釜高速剪切2小时后，让纳米高岭土片状晶体互相穿插叠加，形成纳米改性聚已烯醇涂布液，所述纳米层状高岭土与聚乙烯醇的质量比为1：12；
(2)将步骤(1)制备的纳米改性聚乙烯醇涂布液经涂布机涂覆PET镀铝膜表面，干燥后在PET镀铝膜层上形成涂布PVA高阻隔材料层；
(3)将无菌纸经凹版纸张印刷机或卫星式柔板印刷机印刷图案，形成印有文字及图案的纸层；
(4)按照第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层的顺序，将步骤(2)制备的PET镀铝膜层和涂布PVA高阻隔材料层与其他结构经多层共挤挤出复合形成所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料。
本发明制备的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，氧气透过量为1.5cm3/m2·24h·1mpa；水蒸渗透过量为0.62g/m2·24h。
实施例2
一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其自上向下依次由以下结构构成：
厚度为12μm的第一聚乙烯层；
厚度为280μm的纸层；
厚度为20μm的第二聚乙烯层；
厚度为3μm的涂布PVA高阻隔材料层；
厚度为11μm的PET镀铝膜层；
厚度为7μm的粘合树脂层；
厚度为28μm的第三聚乙烯层。
所述第一聚乙烯层、第三聚乙烯层、第七聚乙烯层均为低密度聚乙烯。
所述纸层为为耐折度大于350次，挺度纵向≥5.8mn.m，横向≥2.3mn.m，边渗≤0.8kg/m2，白度≤1.0％的无菌纸；所述纸层占所述复合无菌包装材料重量的75％。
所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料的制备方法，步骤如下：
(1)制备纳米改性聚乙烯醇涂布液：将聚乙烯醇粉状颗粒在90℃的水中溶解后加入纳米层状高岭土经反应釜高速剪切2.5小时后，让纳米高岭土片状晶体互相穿插叠加，形成纳米改性聚已烯醇涂布液，所述纳米层状高岭土与聚乙烯醇的质量比为1：15；
(2)将步骤(1)制备的纳米改性聚乙烯醇涂布液经涂布机涂覆PET镀铝膜表面，干燥后在PET镀铝膜层上形成涂布PVA高阻隔材料层；
(3)将无菌纸经凹版纸张印刷机或卫星式柔板印刷机印刷图案，形成纸层；
(4)按照第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层的顺序，将步骤(2)制备的PET镀铝膜层和涂布PVA高阻隔材料层与其他结构经多层共挤挤出复合形成所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料。
本发明制备的纸、塑、PVA涂覆镀PET铝膜复合无菌包装材料，氧气透过量为0.87cm3/m2·24h·1mpa；水蒸渗透过量为0.60g/m2·24h。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (9)

1.一种纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，其自上向下依次包括第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层。
2.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述第一聚乙烯层的厚度为9～11μm；第二纸层的厚度为255～265μm；第三聚乙烯层的厚度为15～18μm，第四涂布PVA高阻隔材料层的厚度为2～3μm；第五PET镀铝膜层的厚度为10～12μm；第六粘合树脂层的厚度为5～7μm；第七聚乙烯层的厚度为23～27μm。
3.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料的氧气透过量为1～5cm3/m2·24h·1mpa；水蒸渗透过量为0.6～0.7g/m2·24h。
4.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述第一聚乙烯层、第三聚乙烯层、第七聚乙烯层均为低密度聚乙烯或茂金属聚乙烯中的任意一种或两种。
5.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述粘合树脂层的具体成分为乙烯-丙烯酸共聚物粘合树脂或酸酐改性的乙烯-醋酸乙烯粘合树脂中的任意一种。
6.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述纸层为耐折度大于350次，挺度纵向≥5.8mn.m，横向≥2.3mn.m，边渗≤0.8kg/m2，白度≤1.0％的无菌纸。
7.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述纸层占所述复合无菌包装材料重量的70～75％。
8.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料，其特征在于，所述涂布PVA高阻隔材料层的具体成分为：纳米改性聚乙烯醇涂布液；所述纳米改性聚乙烯醇涂布液由纳米层状高岭土和聚乙烯醇按照0.5～1:10～15的质量比构成。
9.根据权利要求1所述的纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料的制备方法，其特征在于，包括以下步骤：
(1)制备纳米改性聚乙烯醇涂布液：将聚乙烯醇粉状颗粒在85～95℃的水中溶解后加入纳米层状高岭土经反应釜高速剪切2.5～3小时后，让纳米高岭土片状晶体互相穿插叠加，形成纳米改性聚已烯醇涂布液；
(2)将步骤(1)制备的纳米改性聚乙烯醇涂布液经涂布机涂覆PET镀铝膜表面，干燥后在PET镀铝膜层上形成涂布纳米改性PVA高阻隔材料层；
(3)将无菌纸经凹版纸张印刷机或卫星式柔板印刷机印刷图案，形成具有印刷文字及图案的纸层；
(4)按照第一聚乙烯层、第二纸层、第三聚乙烯层、第四涂布PVA高阻隔材料层、第五PET镀铝膜层、第六粘合树脂层、第七聚乙烯层的顺序，将步骤(2)制备的PET镀铝膜层和涂布PVA高阻隔材料层与其他结构经多层共挤复合机组挤出复合形成所述纸、塑、PVA涂覆PET镀铝膜复合无菌包装材料。
CN202210587036.9A 2022-05-26 2022-05-26 纸、塑、pva涂覆pet镀铝膜复合无菌包装材料及其制备方法 Pending CN115027118A (zh)

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