CN113832774A - 纸材以及使用其的软包装材 - Google Patents
纸材以及使用其的软包装材 Download PDFInfo
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Abstract
本发明提供一种纸材以及使用其的软包装材。纸材的至少一表面涂布有第一涂布层和第二涂布层，纸材具有大于45200sec的透气度及小于40dyn/cm的达因值。第一涂布层包括无机填料以及第一水性可热封涂料，第一水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物或苯乙烯丙烯酸酯乳液。第二涂布层包括无机填料以及第二水性可热封涂料，第二水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物、苯乙烯丙烯酸酯乳液或聚乙烯醇。
Description
技术领域
本发明涉及一种纸材以及使用其的软包装材，且特别是涉及一种无氟纸材以及使用其的软包装材，同时兼具耐水、耐油、高阻气性、可再散浆性、可热封性及低表面能等优点。
背景技术
包装的形式千变万化，不仅可吸引消费者注意，更可为产品提供保护及便于流通的功能，被广泛的应用在食品、电子、医疗、生活用品以及家电等用途，是商品流通不可或缺的一部分。近年来，随着食品产业发展，具有高度实用性的软包装材被广泛使用于食品包装，但现有的软包装材普遍存在难以回收的缺点。基于资源可回收性以及环境保护的考虑，软包装材的发展趋势将朝向绿色永续以及回收循环的方向发展。
全氟烷基和多氟烷基物质(PFAS，Per-and polyfluoroalkyl substances)因其独特的化学和物理特性(包括防油和低表面能的特性)而广泛用于各种消费品和工业应用中(例如软包装材)，其中最著名的是全氟辛酸(PFOA，perfluorooctanoic acid)和全氟辛烷磺酸(PFOS，perfluorooctane sulfonic acid)。然而，全氟烷基和多氟烷基物质为一种持久的、具有生物蓄积性的有毒物质，因此，可能会对环境和人类健康造成严重且不可逆的不利影响。基于此点，目前已有相当多的国家禁止生产和使用全氟烷基和多氟烷基物质。
在先前技术中，TW 201945198是关于一种可用作食品软包装材的纸制阻障材料，在阻障涂覆层中含有扁平无机颜料A及扁平无机颜料B，扁平无机颜料A为云母，扁平无机颜料B为高岭土或黏土，但此案中并未提及是否具有耐油性质以及可再散浆性。TW 201927574提供一种纸基材，纸基材上依序具有水蒸气阻障层、气体阻障层，水蒸气阻障层含有水蒸气阻障性树脂及拨水剂，气体阻障层含有水溶性高分子及界面活性剂，但此案仅教示具有阻隔水蒸气和氧气的功能。CN102177296B供一种涂布纸，具有多层涂层，包括：用胶乳形成的第一水蒸气阻挡层、生物聚合物阻挡层以及第二水蒸气阻挡层，虽然具有改进的油脂抵抗性质、氧阻挡性质和水蒸气阻挡性质，但涂布三层的加工制程繁琐，且此案亦仅教示具有阻隔水蒸气和氧气的功能。
基于上述，开发一种无氟纸材以及使用其的软包装材，进而避免对环境和人类健康造成严重且不可逆的不利影响，同时兼具耐水、耐油、高阻气性，可再散浆性、可热封性及低表面能等优点，为本领域技术人员亟欲发展的目标。
发明内容
本发明提供一种无氟纸材，在制备为软包装材后具有高度的可再散浆性达到可循环再造的环保目标，同时又兼具耐水、耐油、高阻气性、可热封性及低表面能等优点。
本发明提供一种纸材，具有大于45200sec的透气度及小于40dyn/cm的达因值。
本发明的纸材的至少一表面涂布有第一涂布层和第二涂布层。第一涂布层包括无机填料以及第一水性可热封涂料，第一水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物或苯乙烯丙烯酸酯乳液。第二涂布层包括无机填料以及第二水性可热封涂料，第二水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物、苯乙烯丙烯酸酯乳液或聚乙烯醇。
在本发明的一实施例中，纸材具有大于85％的纤维得率。
在本发明的一实施例中，第一涂布层的涂布重量为3g/m2至20g/m2。
在本发明的一实施例中，第二涂布层的涂布重量为3g/m2至20g/m2。
在本发明的一实施例中，第一涂布层与所述第二涂布层的涂布重量的总和为6g/m2至30g/m2。
在本发明的一实施例中，第二涂布层为预涂层，介于纸材的表面与第一涂布层之间。
在本发明的一实施例中，第一涂布层和第二涂布层的配方相同或不同。
在本发明的一实施例中，纸材的基重为30g/m2至200g/m2。
在本发明的一实施例中，无机填料包括碳酸钙、高岭土、云母、滑石粉或膨润土。
在本发明的一实施例中，在第一涂布层中，无机填料以及第一水性可热封涂料的干重比为100:50至100:200。
在本发明的一实施例中，在第二涂布层中，无机填料以及第二水性可热封涂料的干重比为100:20至100:100。
本发明也提供一种软包装材，使用上述纸材。
基于上述，本发明提供一种纸材以及使用其的软包装材，纸材的至少一表面涂布有第一涂布层和第二涂布层，纸材具有大于45200sec的透气度及小于40dyn/cm的达因值。此外，本发明的纸材不含有全氟烷基和多氟烷基物质，因此，符合现今产业界的环保需求，能够避免对环境和人类健康造成严重且不可逆的不利影响。另一方面，本发明的纸材通过可再散浆试验，可归入一般纸类回收，后端回收商可因此减少处理成本与工序，进而提升废弃物回收率。
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具体实施方式
以下，将详细描述本发明的实施例。然而，这些实施例为例示性，且本发明揭露不限于此。
在本文中，由“一数值至另一数值”表示的范围，是一种避免在说明书中一一列举该范围中的所有数值的概要性表示方式。因此，某一特定数值范围的记载，涵盖该数值范围内的任意数值以及由该数值范围内的任意数值界定出的较小数值范围，如同在说明书中说明文写出该任意数值和该较小数值范围一样。
本发明提供一种纸材以及使用其的软包装材。纸材的至少一表面涂布有第一涂布层和第二涂布层，其中第二涂布层为预涂层，介于纸材的表面与第一涂布层之间。纸材可具有大于45200sec的透气度及小于40dyn/cm的达因值，纸材的基重例如是30g/m2至200g/m2。
在本实施例中，第一涂布层包括无机填料以及第一水性可热封涂料，在第一涂布层中，无机填料以及第一水性可热封涂料的干重比例如是100:50至100:200，第一水性可热封涂料可包括聚烯烃分散体、乙烯丙烯酸共聚物或苯乙烯丙烯酸酯乳液。第二涂布层包括无机填料以及第二水性可热封涂料，在第二涂布层中，无机填料以及第二水性可热封涂料的干重比例如是100:20至100:100，第二水性可热封涂料可包括聚烯烃分散体、乙烯丙烯酸共聚物、苯乙烯丙烯酸酯乳液或聚乙烯醇。无机填料可包括碳酸钙、高岭土、云母、滑石粉或膨润土，但本发明并不以此为限。
在本实施例中，第一涂布层的涂布重量例如是3g/m2至20g/m2，第二涂布层的涂布重量例如是3g/m2至20g/m2，第一涂布层与第二涂布层的涂布重量的总和例如是6g/m2至30g/m2。第一涂布层和第二涂布层的配方可以是相同或不同。
本发明中所提到的“软包装材”是指在充填或取出内装物后，容器形状可发生变化的包装。一般而言，用纸材、铝箔、纤维、塑料薄膜以及其复合物所制成的各种袋、盒、套、包封等均为软包装材，可用于进行食品包装，本发明主要是使用纸材制成软包装材。在先前技术中，使用全氟烷基和多氟烷基物质制成软包装材，但全氟烷基和多氟烷基物质为一种持久的、具有生物蓄积性的有毒物质，因此，可能会对环境和人类健康造成严重且不可逆的不利影响。本发明则是使用纸材取代习知的全氟烷基和多氟烷基物质，进而避免对环境和人类健康造成严重且不可逆的不利影响。
以下，藉由实验例来详细说明上述实施例所提出的纸材以及使用其的软包装材。然而，下述实验例并非用以限制本发明。
测试方法
透气度是根据ISO 5636-5/TAPPI T460测试方法测定。此测试方法测量一定量的空气通过试样所需的时间。气压由重力缸产生，该重力缸使用液体密封件捕获腔室内的空气量。加压的空气被引导到夹紧垫圈，该垫圈固定住试样。随着内筒稳定地向下移动，测量以秒为单位的秒数，这是内筒从150mL标记下降到250mL标记所需的时间。穿过试样的空气通过下游夹板上的孔逸出到大气中。
水蒸气透过率(WVTR，Water vapor transmission rate)是通过ASTM F1249测试方法测量，测定条件为温度37.8℃且相对湿度90％。干燥室与已知温度和湿度的湿室通过待测试的阻隔材料隔开。干燥室与湿室构成扩散池(diffusion cell)，其中将测试膜密封。将扩散池放置在测试站中，在该测试站中，干燥室和薄膜顶部被干燥的空气或干燥的氮气吹扫。透过薄膜扩散的水蒸气与空气混合，并被带入调压红外传感器。该传感器测量被水蒸气吸收的红外能量的一部分，并产生电信号，其幅度与水蒸气浓度成正比。将由测试膜产生的电信号的振幅与通过测量已知透射率的校准膜产生的信号进行比较。然后，此信息将用于计算WVTR。
表面能量是通过达因笔测试(DIN ISO 8296)测量。依DIN ISO 8296规范，测定表面能量(表面张力)的方法，是用已知不同表面能量的墨(例如：达因笔)，在待测样品上刷约100mm墨痕，并观察其90％以上的墨痕在2秒钟内是否发生收缩并形成墨滴。如有，则换低一级表面能量的墨水再进行相同观察，直至不收缩和出现墨滴，此即为对应该样品的表面能量。
耐油性是通过TAPPI T 559测试方法评估。TAPPI T 559测试方法也被称为试剂盒测试(kit test)，包括将一滴蓖麻油、庚烷和甲苯的混合物滴在经涂布的纸材上，并在15秒后观察经涂布的纸材是否变黑。总共使用了十二种不同的混合物，基于混合物的渗透性，将混合物编号为混合物1至混合物12，其中混合物12渗透性最大，而混合物1渗透性最小。混合物中蓖麻油含量越少，混合物的腐蚀性就越强。当至少一部分测试混合物被经涂布的纸材吸收时，通过经涂布的纸材的变黑或变色来表示“失败”，样品分数是经涂布的纸材未“失败”时使用的编号最高的混合物(混合物1至混合物12)，被称为“试剂盒级别(Kit no.)”。基本上，当Kit no.值越高，则代表耐油性越好。
耐水性是通过TAPPI T 441测试方法评估，藉由Cobb吸水度测试仪测量涂布层的吸水率。吸水率(Cobb值)定义为特定时间内(30分钟内)在1厘米水深下1平方米的纸、纸板或瓦楞纤维板吸收的水量。基本上，当Cobb值越低，则代表耐水性越好。
起封温度通过热封强度测试测量。通过加热和加压(0.5秒，300kPa)密封两个纸材的涂布层，密封样品是从密封的纸材切下的15mm宽的样品。密封强度是根据ASTM D1876剥离试验测定，导致纸张样品破裂的最低温度即为起封温度。
可再散浆试验是依据来自于FBA(The Fibre Box Association)的标准方法，用以评估可回收性和再循环性。将纸材在搅拌器和崩解仪中于pH为7(±0.5pH)的水中重新制浆，并保持在温度约50℃左右。纸材在具有0.010英寸或更小缝隙的筛网中分离，以确定纤维得率(以纤维进料量的百分比表示)，其中筛网是具有很多长条状空隙的网子。更详细而言，纤维得率的作法是，通过具有0.010英寸(宽度)筛网的部分用于计算纤维得率。可再散浆试验的评估标准为：纤维得率大于85％为通过可再散浆试验；若低于此数值，则代表未通过可再散浆试验，涂布的材料和纤维无法分开。
制备涂料组合物
将高岭土(CAPIMTM，作为无机填料)添加到蒸馏水中，并将混合物以1800rpm搅拌20分钟至30分钟，以获得高岭土浆料。然后，将高岭土浆料与水性可热封涂料混合，并在900rpm下搅拌5分钟至10分钟，以得到本发明的涂料组合物。
纸材涂布
纸材由阔叶树纸浆(LBKP)和针叶树纸浆(NBKP)的混合纸浆制成。在纸材上涂布涂料组合物，并干燥以形成第一涂布层。然后，在纸材的第一涂布层上进一步涂布涂料组合物，以形成第二涂布层。下方表1至表3列出了实例1至实例17以及比较例1至比较例2中第一涂布层以及第二涂布层的涂布重量和组成配方。同时，分别以上文所述的测试方法评估实例1至实例17的各项性质，评估结果列于以下表1至表3中。
在表1至表3中，涂料配方是指高岭土以及水性可热封涂料的干重比。水性可热封涂料包括聚烯烃分散体(商品名RHOBARRTM 320，简称为“R320”)、乙烯丙烯酸共聚物(商品名AquasealTM X2221，简称为“X2221”)、苯乙烯丙烯酸酯乳液(
Coat 95，简称为“MC95”)或聚乙烯醇。
表1
表2
表3
由上方表1至表2可得知，实例1至实例17为本发明表面涂布有第一涂布层和第二涂布层的纸材，具有大于45200sec的透气度及小于40dyn/cm的达因值，均呈现良好的透气度、耐水及耐油性质，同时具有可热封性，且无论第一涂布层和第二涂布层的配方相同或不同的情况下皆是如此。
再进一步地测试本发明提供的纸材的可再散浆性。由上方表3可得知，实例9以及实例11为本发明表面涂布有第一涂布层和第二涂布层的纸材，纤维得率均大于85％，通过可再散浆试验。比较例1及比较例2则是于第二涂布层中不含有无机填料，仅含有水性可热封涂料，因此，纤维得率均小于85％，未通过可再散浆试验。此实验结果显示，无机填料的添加对于可再散浆的重要性，本发明的纸材具有高度的可再散浆性，能够让第一涂布层和第二涂布层与纸基材分离，大幅提高纸基材的回收率而能重新再制备为纸浆。
综上所述，本发明提供一种纸材以及使用其的软包装材，纸材的至少一表面涂布有第一涂布层和第二涂布层，纸材具有大于45200sec的透气度及小于40dyn/cm的达因值，呈现高阻气性、耐水及耐油性质，更具有可热封性。此外，本发明的纸材不含有全氟烷基和多氟烷基物质，因此，符合现今产业界的环保需求，能够避免对环境和人类健康造成严重且不可逆的不利影响。另一方面，本发明的纸材通过可再散浆试验，可归入一般纸类回收，后端回收商可因此减少处理成本与工序，进而提升废弃物回收率，因此，可解决现有软包装材难以回收的缺点，兼顾资源可回收性以及环境保护，符合现今世界各国在包装材上朝向绿色永续以及回收循环方向发展的趋势。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (12)
1.一种纸材，其特征在于，至少一表面涂布有第一涂布层和第二涂布层，所述纸材具有大于45200sec的透气度及小于40dyn/cm的达因值，
其中所述第一涂布层包括无机填料以及第一水性可热封涂料，所述第一水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物或苯乙烯丙烯酸酯乳液；
所述第二涂布层包括无机填料以及第二水性可热封涂料，所述第二水性可热封涂料包括聚烯烃分散体、乙烯丙烯酸共聚物、苯乙烯丙烯酸酯乳液或聚乙烯醇。
2.根据权利要求1所述的纸材，其特征在于，所述纸材具有大于85％的纤维得率。
3.根据权利要求1所述的纸材，其特征在于，所述第一涂布层的涂布重量为3g/m2至20g/m2。
4.根据权利要求1所述的纸材，其特征在于，所述第二涂布层的涂布重量为3g/m2至20g/m2。
5.根据权利要求1所述的纸材，其特征在于，所述第一涂布层与所述第二涂布层的涂布重量的总和为6g/m2至30g/m2。
6.根据权利要求1所述的纸材，其特征在于，所述第二涂布层为预涂层，介于所述纸材的表面与所述第一涂布层之间。
7.根据权利要求1所述的纸材，其特征在于，所述第一涂布层和所述第二涂布层的配方相同或不同。
8.根据权利要求1所述的纸材，其特征在于，所述纸材的基重为30g/m2至200g/m2。
9.根据权利要求1所述的纸材，其特征在于，所述无机填料包括碳酸钙、高岭土、云母、滑石粉或膨润土。
10.根据权利要求1所述的纸材，其特征在于，在所述第一涂布层中，无机填料以及所述第一水性可热封涂料的干重比为100:50至100:200。
11.根据权利要求1所述的纸材，其特征在于，在所述第二涂布层中，无机填料以及所述第二水性可热封涂料的干重比为100:20至100:100。
12.一种软包装材，使用如权利要求1所述的纸材。
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- 2021-06-23 CN CN202110699561.5A patent/CN113832774B/zh active Active
- 2021-06-23 US US17/355,188 patent/US20210394983A1/en not_active Abandoned
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| CN116411484A (zh) * | 2021-12-31 | 2023-07-11 | 东莞市锐泽创艺新材料有限公司 | 一种环保纸杯无塑涂布纸及其制备方法和制得的环保纸杯 |
| CN116411484B (zh) * | 2021-12-31 | 2024-05-10 | 东莞市锐泽创艺新材料有限公司 | 一种环保纸杯无塑涂布纸及其制备方法和制得的环保纸杯 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113832774B (zh) | 2023-12-08 |
| EP3929355A1 (en) | 2021-12-29 |
| TWI814014B (zh) | 2023-09-01 |
| TW202200868A (zh) | 2022-01-01 |
| US20210394983A1 (en) | 2021-12-23 |
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