CN112849734A - 用于食品容器的盖子包装材料 - Google Patents
用于食品容器的盖子包装材料 Download PDFInfo
- Publication number
- CN112849734A CN112849734A CN202110015916.4A CN202110015916A CN112849734A CN 112849734 A CN112849734 A CN 112849734A CN 202110015916 A CN202110015916 A CN 202110015916A CN 112849734 A CN112849734 A CN 112849734A
- Authority
- CN
- China
- Prior art keywords
- wax
- food container
- container according
- lid
- packaging material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
本发明涉及一种用于食品容器的盖子包装材料，根据本发明一实施例的用于食品容器的盖子包装材料包括：基材层；以及形成在所述基材层上的热粘合层，并且，所述热粘合层包括具有不同熔点的至少两种以上的蜡。
Description
技术领域
本发明涉及一种用于食品容器的盖子包装材料。
背景技术
在产品表面实现拒水性有多种方法。例如，当在产品的表面上形成微或纳米尺寸的微结构时，该产品可以具有拒水性，优选地，可以具有超拒水性。另外，疏水性材料的表面处理方法也可以实现拒水性表面。
在各种食品、药品、化妆品等包装内容物的包装材料中，除阻隔性(barrierproperty)、密封性(sealing property)等外，还要求拒水性。尤其，在用于包装具有液相、粘性体、凝胶相等性质的内容物(例如，牛奶、水果饮料、液态酸奶和半固态酸奶等食品)的包装材料中，由于存在内容物粘合于包装材料的问题，因此，人们提出了一种能够连续显示非粘合性的覆盖物。
对于用于包装具有液相、粘性体和凝胶相性质的内容物的包装材料，除了阻隔性、密封性等外，还要求具有使内容物难以粘合到包装材料表面的非粘合性。当内容物粘合在包装材料的表面时，由于使用者无法喝完所有的内容物，因此会产生很大的损失，而且由于手上涂有这些内容物，在卫生方面也是一种问题。可以通过在包装材料表面赋予拒水性、优选地超级拒水性来实现这种非粘合性。
一般地，片式(或薄膜型)包装材料具有多层结构，并且这些基本上包括具有阻隔性的支撑件和形成在所述支撑件的至少一面上的密封剂层(sealant layer)。此时，所述密封剂层被热粘合(热熔合)以提高密封性。此外，作为具有非粘合性(拒水性)的包装材料，存在一种防粘盖，其通过在密封剂层中包含非离子表面活性剂或疏水性添加剂来促进内容物的粘合预防(拒水性)。但是，由于非离子表面活性剂或疏水性添加剂难以与内容物(酸奶等)接触，因此难以表现出非粘合性。
此外，本发明提供一种层压板和容器，其具有粘合于其最外层表面的疏水性氧化物粒子(疏水性二氧化硅粒子)。由于疏水性氧化物粒子暴露于表面以与内容物接触，因此可以改进非粘合性(拒水性)。然而，该包装材料不仅要求非粘合性(拒水性)，而且还应具有良好的热粘合强度及被粘物，以确保内容物的安全储存，但大多数包装材料并未考虑这些因素。尤其，在将用于包装的盖子材料热粘合(热熔合)到包装容器之后，必须在粘合剂界面上具有优异的热粘合强度以保持密封性，但其难以表现出优异的热粘合强度。
因此，需要开发一种既能拒水又能保持优异的热粘合强度的粘性液体容器的密封用包装材料。
发明内容
要解决的技术问题
本发明的目的在于解决上述问题，为此提供一种用于食品容器的盖子包装材料，其能够提供高拒水性以防止食物的粘合，并具有优异的热粘合性。
然而，本发明要解决的问题并非受限于上述言及的问题，未言及的其他问题能够通过以下记载由本领域普通技术人员所明确理解。
解决问题的技术方法
根据本发明的一实施例的用于食品容器的盖子包装材料包括：基材层；以及形成在所述基材层上的热粘合层，并且，所述热粘合层包括具有不同熔点的至少两种以上的蜡。
在一实施例中，所述蜡可以包括从由石油蜡、植物蜡及动物蜡组成的群组中选择的至少两种以上的混合物。
在一实施例中，所述蜡可以包括从由蜜蜡、聚烯烃蜡、聚乙烯蜡、聚丙烯蜡、丙烯酸蜡、脂肪酰胺蜡、硅蜡、聚四氟乙烯蜡、巴西棕榈蜡(Carnauba wax)、杨梅蜡(bayberrywax)、蜂蜡(Beeswax)、虫胶蜡(Shellac wax)、鲸蜡(Spermaceti wax)、褐煤蜡(Montanwax)、地蜡(Ozokerite wax)、纯地蜡(Ceresin wax)、石蜡(Paraffin wax)、微晶蜡(microcrystalline wax)、费-托合成蜡蜡(Fischer-Tropsch wax)、甘蔗蜡、烤蜡、米糠蜡及小烛树蜡组成的群组中选择的至少两种以上的混合物。
在一实施例中，在所述热粘合层中，具有不同熔点的至少两种以上的蜡中一种可以是巴西棕榈蜡。
在一实施例中，所述巴西棕榈蜡可以是具有不同熔点的至少两种以上的蜡的总重量的30重量％至60重量％。
在一实施例中，所述蜡可以是将具有不同熔点的两种蜡以10:1至30:1的重量比进行混合的混合物。
在一实施例中，所述热粘合层还可以包括从由聚甲基丙烯酸甲酯(PMMA)珠、玻璃珠、氧化锆珠、陶瓷珠、金属珠及树脂珠组成的群组中选择的至少任一种。
在一实施例中，所述热粘合层可以包括从由圆形、空心形、椭圆形、三角形、方形、五边形、六边形、八角形、圆柱形及多面棱柱形组成的群组中选择的至少任一种图案，并包括以网格形式排列。
在一实施例中，所述图案的平均尺寸可以是50μm至200μm。
在一实施例中，所述热粘合层的厚度可以是50μm至200μm。
在一实施例中，还可以包括所述热粘合层上的疏水性粒子。
在一实施例中，所述疏水性粒子可以包括从由二氧化硅、氧化铝、铝硅酸盐、二氧化钛、二氧化硅气凝胶、氧化铁、氧化锌、氧化铜、氧化镍及氧化钴组成的群组中选择的至少任一种。
在一实施例中，所述疏水性粒子的粒径可以是1nm至2000nm。
在一实施例中，所述疏水性粒子可以埋藏在形成所述热粘合层图案的各个细胞之间。
在一实施例中，所述埋藏的疏水性粒子的埋藏厚度可以是1μm至50μm。
在一实施例中，在常温下，所述用于食品容器的盖子包装材料的水接触角可以是150°以上，在50°以上，所述用于食品容器的盖子包装材料的水接触角可以是100°至140°。
在一实施例中，所述用于食品容器的盖子包装材料的表面粗糙度，其中心线平均粗糙度(Sa)可以是20μm至30μm，其十点平均粗糙度(Sz)可以是8μm至15μm。
在一实施例中，所述用于食品容器的盖子包装材料的线粗糙度，其中心线平均粗糙度(Ra)可以是15μm至25μm，其十点平均粗糙度(Rz)可以是35μm至45μm。
发明的效果
根据本发明一实施例的用于食品容器的盖子包装材料可用作包装材料，其通过拒水性及拒油性来防止液体相(例如，牛奶、水果饮料、液体酸奶及半固态酸奶)、粘性体或凝胶相被涂抹在包装材料中。作为用于食品容器的盖子包装材料的热粘合层，在相对高温条件下，至少涂有两种不同熔点的蜡，因此可以保持超拒水性能，并可防止粘性液体浸透食品容器用包装材料，同时抑制疏水性粒子的去除或污染。此外，在密封(sealing)强度上具有较高的强度。
附图说明
图1为显示根据本发明一实施例的用于食品容器的盖子包装材料的断面图。
图2为显示根据本发明另一实施例的用于食品容器的盖子包装材料的断面图。
图3为显示根据本发明另一实施例的用于食品容器的盖子包装材料的透视图。
图4为显示根据本发明一实施例的热粘合层表面的断面图。
图5为显示根据本发明实施例1的用于食品容器的盖子包装材料的热粘合层表面上的图案的附图。
图6为显示根据本发明(a)比较例及(b)实施例的用于食品容器的盖子包装材料的防水性评估结果的附图。
图7为显示根据本发明比较例的基于包装材料温度的接触角的附图。
图8为显示根据本发明实施例1的基于包装材料温度的接触角的附图。
图9为显示根据本发明(a)比较例及(b)实施例的包装材料表面上的3D图案分析结果的附图。
具体实施方式
以下，参照附图对本发明的实施例进行详细说明。在说明本发明的过程中，当判断对于相关公知功能或者构成的具体说明不必要地混淆本发明的要旨时，省略对其进行详细说明。并且，本说明书中使用的术语用于准确地表达本发明的优选实施例，能够根据使用者、利用者的意图或者本发明所属技术领域的惯例有所不同。由此，对于本术语的定义应根据本说明书的整体内容进行定义。显示在各附图中的相同的附图标记表示相同的结构要素。
在整体说明书中，当记载某个部件位于其他部件“上”时，不仅表示某一部件接触其他部件的情况，也包括两个部件之间存在其他部件的情况。
在整体说明书中，当说明某一部分“包括”某一构成要素时，不表示排除其他构成要素，还能够包括其他构成要素。
以下，参照实施例及附图对本发明的用于食品容器的盖子包装材料进行具体说明。然而，本发明并非受限于实施例及附图。
根据本发明一实施例的用于食品容器的盖子包装材料包括：基材层；以及形成在所述基材层上的热粘合层，并且，所述热粘合层包括具有不同熔点的至少两种以上的蜡。
根据本发明一实施例的用于食品容器的盖子包装材料可用作包装材料，其通过拒水性及拒油性来防止液体相(例如，牛奶、水果饮料、液体酸奶及半固态酸奶)、粘性体或凝胶相被涂抹在包装材料中。作为用于食品容器的盖子包装材料的热粘合层，在相对高温条件下，至少涂有两种不同熔点的蜡，因此可以保持超拒水性能，并可防止粘性液体浸透食品容器用包装材料，同时抑制疏水性粒子的去除或污染。此外，在密封(sealing)强度上具有较高的强度。
图1为显示根据本发明一实施例的用于食品容器的盖子包装材料的断面图。
参照图1，根据本发明一实施例的用于食品容器的盖子包装材料100包括基材层110及热粘合层120。
根据一实施例，所述基材层110可以包括从由纸张、合成纸、树脂膜、合成树脂膜及金属箔组成的群组中选择的至少任一种。例如，所述基材层110可以使用OPP(OrientedPoly Propylene)、PET(Polyethylene Terephthalate)、LLDPE(linear low-densitypolyethylene)、PE(Polyethylene)、PP(Poly propylene)、PO(polyolefin)、PBT(Polybutylene Terephthalate)、PPS(Poly phenylene Sulfide)、尼龙材料、聚乙烯薄膜、环氧基薄膜或铝箔，也可以使用由两种以上的基材层层压的基材层。在一实施例中，所述基材层110的厚度可以是30μm至150μm厚度。由于当上述基材层之厚度小于30μm时，基材太薄，因此存在包括压痕故障及蜡热熔胶应用不良之问题，且当基材层之厚度超过150μm时，由于基材太厚，热传递功率降低，与容器的粘合性可能会恶化。所述基材层的厚度可以根据食物内容物、容器等类型来进行调整。
在一实施例中，所述基材层110可以进一步包括阻挡层(未示出)。所述阻挡层可以起到阻挡氧气、水蒸气、光等的阻挡作用。所述阻挡层可以包括从由AlOx、SiOx、铝、VMPET(Vacuum metalized PET)、尼龙、OPP(Oriendted polypropylene)、CPP(CastingPolypropylene)、铝箔、EVOH、PVDC及PE(Polyethylene)组成的群组中选择的至少任一种。例如，当阻挡层包括VMPET时，基材层可以确保高耐热性、气体阻挡性、防潮性、遮光性等。
在一实施例中，所述热粘合层120可以包括从由聚烯烃基粘合剂、聚酯基粘合剂、密封剂粘合剂、热熔粘合剂、环氧基粘合剂、聚氨酯粘合剂、聚氨酯基粘合剂、丙烯酸基粘合剂、乙烯基粘合剂、油漆粘合剂及易填充的粘合剂组成的群组中选择的任一种。例如，可以同时使用密封剂粘合剂和热熔粘合剂。例如，所述热熔粘合剂可以是乙烯-醋酸乙烯酯(EVA)基热熔粘合剂。所述热粘合层120在表面特性方面，其密封剂粘合剂具有优异的粘合强度，并且，热熔粘合剂作为辅助粘合剂，在粘合过程中起到保持密封剂直到密封剂固化的作用。
在一实施例中，由于所述热粘合层120具有优异的拒水性能并且能够有效地防止和抑制疏水性粒子的分离，因此可以长时间地表现出拒水性和拒油性，并且与容器具有极好的粘合能力。
在一实施例中，所述热粘合层120包括具有不同熔点的至少两种以上的蜡。
在一实施例中，所述蜡可以包括从由石油蜡、植物蜡及动物蜡组成的群组中选择的至少两种以上的混合物。
在一实施例中，蜡可以包括从由蜜蜡、石蜡、聚烯烃蜡、聚乙烯蜡、聚丙烯蜡、丙烯酸蜡、脂肪酰胺蜡、硅蜡、聚四氟乙烯蜡、巴西棕榈蜡(Carnauba wax)、杨梅蜡(bayberrywax)、蜂蜡(Beeswax)、虫胶蜡(Shellac wax)、鲸蜡(Spermaceti wax)、褐煤蜡(Montanwax)、地蜡(Ozokerite wax)、纯地蜡(Ceresin wax)、微晶蜡(microcrystalline wax)、费-托合成蜡蜡(Fischer-Tropsch wax)、甘蔗蜡、烤蜡、米糠蜡及小烛树蜡组成的群组中选择的至少两种以上的混合物。
在一实施例中，所述蜡可以是:石油蜡，例如石蜡、中间蜡或微晶蜡；植物蜡，例如巴西棕榈蜡；或动物蜡，例如蜂蜡。所述石蜡主要定义为直链饱和烃、较小比例的支链及环链烷烃化合物。所述中间蜡其特性介于石蜡及微晶蜡之间的直链、支链及环链烷烃化合物的混合物。所述微晶蜡是一种平均分子量比石蜡平均分子量高的烃类，其含有更广泛的组分，其中含有大量支链和环链烷烃。所述植物及动物蜡是由许多动植物合成的。动物蜡通常由各种羧酸和脂肪醇制成的蜡酯组成。在植物蜡中，一种独特的非酯化碳氢化合物混合物可能比酯类化合物占优势。由于这些都是混合物，因此自然生成的蜡更软，并且在比纯成分更低的温度下熔化。
在一实施例中，在所述热粘合层中，具有不同熔点的至少两种以上的蜡中一种可以是巴西棕榈蜡。所述巴西棕榈蜡是一种植物蜡，其具有高熔点，并且成本廉价。因此，包括巴西棕榈蜡的热粘合层即使在相对高温的条件下也可以通过提高熔点来保持拒水性能。
在一实施例中，所述巴西棕榈蜡可以是具有不同熔点的至少两种以上的蜡的总重量的30重量％至60重量％。当所述巴西棕榈蜡相对于具有不同熔点的至少两种以上的蜡的总重量的含量小于30重量％时，所述热粘合层在相对高温下可能无法表现出拒水性能；并且，即使当所述巴西棕榈蜡相对于具有不同熔点的至少两种以上的蜡的总重量的含量超过60重量％时，也不会表现出良好的效果。
在一实施例中，所述蜡可以是将具有不同熔点的两种蜡以10:1至30:1的重量比进行混合的混合物。当所述蜡将具有不同熔点的两种蜡以小于30:1的重量比进行混合时，蜡的熔点没有变化；当所述蜡将具有不同熔点的两种蜡以10:1的重量比进行混合时，两种不同熔点的蜡可能无法相互混合，存在相容性问题。
在一实施例中，所述热粘合层120还可以包括从由聚甲基丙烯酸甲酯(PMMA)珠、玻璃珠、氧化锆珠、陶瓷珠、金属珠及树脂珠组成的群组中选择的至少任一种。
图2为显示根据本发明另一实施例的用于食品容器的盖子包装材料的断面图；图3为显示根据本发明另一实施例的用于食品容器的盖子包装材料的透视图。
参照图2及图3，根据本发明另一实施例的用于食品容器的盖子包装材料的热粘合120可以包括图案120a。
在一实施例中，热附着层120可以包括从由圆形、空心形、椭圆形、三角形、方形、五边形、六边形、八角形、圆柱形及多面棱柱形组成的群组中选择的至少任一种图案120a，并可以包括以网格形式排列。所述多面棱柱形可以包括三角形柱、方形柱、六角形柱等。
图3示出了六边形图案排列在蜂窝状的蜂窝结构(honeycomb structure)中。蜂窝结构具有一种排列关系，其中聚集了其内角尺寸为120°的正六边形的三个顶点。由于蜂窝结构允许多个规则六边形柱连续连接，并且具有每根柱的侧面彼此相对的结构，因此可以均衡地分布力并且具有较高的空间利用率。在形成规则六边形图案的情况下，当向包装材料的表面方向施加拉力时，由于该力分散在六个方向上，因此可以具有更高的防止断裂的效果。
尽管在附图中公开了六角形和六角形柱状图案，但也可以布置各种图案。
在一实施例中，所述热粘合层120的图案120a可以通过允许存在于图案之间的空间中的空气将涂抹在包装材料的水或流体推向外部，从而实现包装材料表面的拒水特性。由于形成在热粘合层中的图案使包装材料具有更高的疏水性、拒水性及拒油性，因此即使在用于食品容器的盖子包装材料中涂抹了内容物，也易于使内容物向下流动，由此减少食品包装材料中涂抹的内容物的量，使得消费者可以吃到更多的内容物。
在一实施例中，所述图案120a的平均尺寸可以是50μm至200μm。当所述图案120a的平均尺寸小于50μm时，无法形成图案；当图案120a的平均尺寸大于200μm时，其拒水性能可能会降低。当所述图案120a以圆柱体或多棱镜的形式形成时，其高度可以是50μm至200μm。
在一实施例中，所述热粘合层120的厚度可以是50μm至200μm。当所述热粘合层的厚度小于50μm时，在疏水涂层过程中可能无法进行热粘合；当所述热粘合层的厚度超过200μm时，图案可能会塌陷。
根据一实施例，还可以包括所述热粘合层上的疏水性粒子。
图4为显示根据本发明一实施例的热粘合层表面的断面图。
参照图4，还包括根本发明一实施例的热粘合层图案120a之间的疏水性粒子130。所述疏水性粒子130可以是疏水性氧化物粒子。
根据一实施例，所述疏水性粒子130可以包括从由二氧化硅、氧化铝、铝硅酸盐、二氧化钛、二氧化硅气凝胶、氧化铁、氧化锌、氧化铜、氧化镍及氧化钴组成的群组中选择的至少任一种。
根据一实施例，所述疏水性粒子130的粒径可以是1nm至2000nm。当所述疏水性粒子130的粒径小于1nm时，难以表现出疏水性、拒水性及拒油性效果，因此该影响不显著；当所述疏水性粒子130的粒径大于2000nm的时，由于所述疏水性粒子不均匀地被分散，使得形成所述疏水性粒子的部分变得不均匀。
在一实施例中，涂覆所述疏水性粒子130的方法可以包括，例如，从由喷涂、凹版涂覆、模具涂覆、逗号涂覆、辊涂覆、帘幕涂覆、条状涂覆、刮墨刀及旋涂覆组成的群组中的选择的至少任一种。
在一实施例中，所述疏水性粒子130可以以0.1g/m2至10g/m2的涂覆量涂覆在所述热粘合层120上。当所述疏水性粒子的涂覆量小于0.1g/m2时，包装材料的拒水性和拒油性可能无法正确地表达；当所述疏水性粒子的涂覆量超过10g/m2时，由于疏水性粒子从包装材料中移除，可能会发生污染等问题。
在一实施例中，所述疏水性粒子130可以埋藏在形成所述热粘合层图案的各个细胞之间。优选地，当由具有不同熔点的两种以上的蜡以六边形图案形成热粘合层时，由于在细胞之间进行填充过程更好，疏水性粒子可以很好地埋藏在细胞之间的壁中。
在一实施例中，如图所示，所述疏水性粒子130可以埋藏在图案之间，但也可以粘合到热粘合层120的最外面。此外，疏水性粒子130也可以与热粘合层120混合的状态下粘合到热粘合层120。
在一实施例中，所述埋藏的疏水性粒子的埋藏厚度可以是1μm至50μm。当所述埋藏的疏水性粒子的埋藏厚度小于1μm时，拒水和拒油功能可能会下降；当所述埋藏的疏水性粒子的埋藏厚度超过50μm时，可能难以粘合到容器上。。
在一实施例中，在常温下，所述用于食品容器的盖子包装材料的水接触角可以是150°以上，在50°以上，所述用于食品容器的盖子包装材料的水接触角可以是100°至140°。
在一实施例中，所述用于食品容器的盖子包装材料的表面粗糙度，其中心线平均粗糙度(Sa)可以是20μm至30μm，其十点平均粗糙度(Sz)可以是8μm至15μm。
在一实施例中，所述用于食品容器的盖子包装材料的线粗糙度，其中心线平均粗糙度(Ra)可以是15μm至25μm，其十点平均粗糙度(Rz)可以是35μm至45μm。
根据本发明一实施例的用于食品容器的盖子包装材料在相对高温条件下具有优异的超拒水性能，并能够有效地维持该性能。因此，由于其具有很强的抗污染性，即使在用于食品容器的盖子包装材料中涂抹了内容物，也易于使内容物向下流动，由此减少食品包装材料中涂抹的内容物的量，使得消费者可以吃到更多的内容物。此外，根据本发明一实施例的防水性食品包装材料与容器具有极好的粘合能力，因此，所述防水性食品包装材料可以用作用于密封容器上面的容器盖包装材料。
下面，将参照以下实施例对本发明进行详细描述。然而，本发明的技术思想并不限于此。
[实施例]
将聚氨酯基双组分粘合剂作为热粘合层涂覆在通过层压12μm PET层和VMPET层而获得的基材层上后，并将混合石蜡50重量％和巴西棕榈蜡5重量％的混合物涂覆在其上。
随后，在热粘合层上利用光刻(Photolithographic)工艺来形成直径为50nm的圆形图案。之后，喷涂平均粒径为7nm的二氧化硅(SiO2)，即Degussa公司的“Aerosil”产品作为疏水性粒子。喷涂工艺在压力为6Bar、喷涂距离为10cm的条件下进行。
图5为显示根据本发明实施例1的用于食品容器的盖子包装材料的热粘合层表面上的图案的附图。参照图5(a)，可以看出热粘合层表面形成为圆形图案。此外，参照放大的图5(b),可以看出在热粘合层的无图案的部分上涂覆有SiO2微粒。
[比较例]
除了在实施例中未添加巴西棕榈蜡外，与实施例相同的方式制造了包装材料。
半固态酸奶的拒水性/拒油性评估
将在上述制造的实施例的用于食品容器的盖子包装材料使用为含有半固体酸奶(油脂成分50％以上)的酸奶容器的盖子。
将酸奶容器倾斜约45°，并评估半固态酸奶是否在没有任何污渍的情况下向下流动。
图6为显示根据本发明(a)比较例及(b)实施例的用于食品容器的盖子包装材料的防水性评估结果的附图。可以确认，半固态酸奶在图6a中的盖子中被严重地涂抹，而在图6b中，半固体酸奶连续地向下流动且没有被涂抹。
半固态酸奶的水接触角分析
将水滴在本发明比较例及实施例的包装材料表面上。
图7为显示根据本发明比较例的基于包装材料温度的接触角的附图；图8为显示根据本发明实施例1的基于包装材料温度的接触角的附图。
下面，表1示出了根据本发明比较例及实施例的包装材料的温度的接触角。
[表1]
参照图7、图8及表1，比较例及实施例的接触角在45℃以下没有变化，并且从50℃开始减小。当在高温条件下比较接触角时，可以看出，在50℃至80℃的温度范围内，比较例的接触角低于实施例例的接触角。
包装材料的高温成分分析
通过将样品置于热板(Hot plate)上并利用FT-IR及光学显微镜设备对样品的热变形进行分析，由此对包装材料的高温成分进行了分析。
比较例的包装材料从40℃生长了1231cm-1(结晶)，并减少了1093cm-1(非晶态)。经证实，比较例的包装材料从60℃生长了1021cm-1(结晶)。
实例的包装材料从50℃生长了1231cm-1(结晶)，并开始减少1080cm-1(非晶态)。
包装材料表面的3D图案分析
利用三维显微镜设备对比较例及实施例的包装材料的3D图案进行了分析。
图9为显示根据本发明(a)比较例及(b)实施例的包装材料表面上的3D图案分析结果的附图。
表2示出了根据本发明比较例及实施例的包装材料表面的表面粗糙度及线粗糙度。
[表2]
可见，实施例的包装材料的表面粗糙度和线粗糙度均大于比较例的包装材料的表面粗糙度和线粗糙度。
基于包装材料温度的密封强度分析
利用高温万能试验机(UTM)(LLOYD社LD5，理工学院材料分析中心)对比较例及实施例的基于包装材料温度的密封强度进行了分析。
样品宽度为15mm，测量距离为50mm，测量分析速率为200mm/min，高温条件为90℃、100℃及110℃。
下面，表3示出了根据本发明比较例及实施例的基于包装材料温度的密封强度分析结果。
[表3]
参照表3，可以确认，实施例的密封强度高于比较例的密封强度。
综上，通过有限的实施例及附图对实施例进行了说明，但本发明并非受限于上述实施例，并且，本领域的普通技术人员能够对上述记载进行多种修改与变形。由此，其他体现、其他实施例及权利要求范围的均等物全部属于专利权利要求的范围。
Claims (18)
1.一种用于食品容器的盖子包装材料，其特征在于，
包括：
基材层；以及
形成在所述基材层上的热粘合层，
所述热粘合层包括具有不同熔点的至少两种以上的蜡。
2.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述蜡包括从由石油蜡、植物蜡及动物蜡组成的群组中选择的至少两种以上的混合物。
3.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述蜡包括从由蜜蜡、石蜡、聚烯烃蜡、聚乙烯蜡、聚丙烯蜡、丙烯酸蜡、脂肪酰胺蜡、硅蜡、聚四氟乙烯蜡、巴西棕榈蜡、杨梅蜡、蜂蜡、虫胶蜡、鲸蜡、褐煤蜡、地蜡、纯地蜡(Ceresinwax)、微晶蜡(microcrystalline wax)、费-托合成蜡蜡、甘蔗蜡、烤蜡、米糠蜡及小烛树蜡组成的群组中选择的至少两种以上的混合物。
4.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
在所述热粘合层中，具有不同熔点的至少两种以上的蜡中一种是巴西棕榈蜡。
5.根据权利要求4所述的用于食品容器的盖子包装材料，其特征在于，
所述巴西棕榈蜡是具有不同熔点的至少两种以上的蜡的总重量的30重量％至60重量％。
6.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述蜡是将具有不同熔点的两种蜡以10:1至30:1的重量比进行混合的混合物。
7.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述热粘合层还包括从由聚甲基丙烯酸甲酯(PMMA)珠、玻璃珠、氧化锆珠、陶瓷珠、金属珠及树脂珠组成的群组中选择的至少任一种。
8.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述热粘合层包括从由圆形、空心形、椭圆形、三角形、方形、五边形、六边形、八角形、圆柱形及多面棱柱形组成的群组中选择的至少任一种图案，并包括以网格形式排列。
9.根据权利要求8所述的用于食品容器的盖子包装材料，其特征在于，
所述图案的平均尺寸为50μm至200μm。
10.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述热粘合层的厚度为50μm至200μm。
11.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
还包括：
所述热粘合层上的疏水性粒子。
12.根据权利要求11所述的用于食品容器的盖子包装材料，其特征在于，
所述疏水性粒子包括从由二氧化硅、氧化铝、铝硅酸盐、二氧化钛、二氧化硅气凝胶、氧化铁、氧化锌、氧化铜、氧化镍及氧化钴组成的群组中选择的至少任一种。
13.根据权利要求11所述的用于食品容器的盖子包装材料，其特征在于，
所述疏水性粒子的粒径为1nm至2000nm。
14.根据权利要求11所述的用于食品容器的盖子包装材料，其特征在于，
所述疏水性粒子埋藏在形成所述热粘合层图案的各个细胞之间。
15.根据权利要求14所述的用于食品容器的盖子包装材料，其特征在于，
所述埋藏的疏水性粒子的埋藏厚度为1μm至50μm。
16.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
在常温下，所述用于食品容器的盖子包装材料的水接触角为150°以上，
在50°以上，所述用于食品容器的盖子包装材料的水接触角为100°至140°。
17.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述用于食品容器的盖子包装材料的表面粗糙度，
中心线平均粗糙度(Sa)为20μm至30μm，
十点平均粗糙度(Sz)为8μm至15μm。
18.根据权利要求1所述的用于食品容器的盖子包装材料，其特征在于，
所述用于食品容器的盖子包装材料的线粗糙度，
中心线平均粗糙度(Ra)为15μm至25μm，
十点平均粗糙度(Rz)为35μm至45μm。
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