CN113906181A - 用于纤维素基材的阻隔层 - Google Patents
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Abstract
本发明涉及制造涂覆基材的方法,其中将可流动的、可生物降解的并且提高气密性的第一涂料施加到含纤维素的基材上。为了实现仅由天然成分组成的具有良好密封性的包装,将由动物和/或植物蜡和/或脂质形成的防水的第二涂料施加到所述第一涂料上。
Description
本发明涉及用于制造涂覆基材的方法,其中将可流动的、可生物降解的并且提高气密性的第一涂料施加到含纤维素的基材上。
由纤维素制成的包装材料,特别是由浇铸纤维(Faserguss)、纸板和纸(纸张)制成的包装材料越来越受欢迎。纤维素纤维是一种非常容易回收的常用材料。回收的原材料(木材、纸等)也非常适合用于制造含纤维素的包装材料。例如在纤维浇铸工艺中对纤维素进行加工。在这种情况下,制造具有纤维素纤维的含水纸浆,由该含水纸浆成型纤维。利用简单的汲取过程,水可通过抽吸模具吸出,其中纤维素纤维沉积在抽吸模具的设有孔的表面上。在转移过程中,由抽吸模具形成的成型体被转移到转移模具,以使其从两侧成型。可使用额外的可提高成型体的表面质量(表面品质)的热处理方法和压制方法。作为替代,纤维素可被加工成纸或纸板并用作包装材料。
从现有技术已知通过涂层使含纤维素的基材基本上是气密性的。为此,基材可例如用纤维素纤维,特别是由纤维素形成的微原纤维和/或纳米原纤维涂覆。
这样的涂覆方法由出版物EP 3 444 399 A1、JP 2015 227517 A、JP 2012 011651 A、WO 2017/144009A1、EP2529942B1和WO 2017/072124A1已知。涂覆有纤维素原纤维的基材另外用聚合物如聚乙烯或聚丙烯涂覆,但也用可生物降解的聚合物如聚乳酸或聚乙烯醇涂覆。
本发明的目的是制造主要由天然原料组成的用于食品包装的在很大程度上气密性和防水的包装。
根据本发明,所述目的通过如下方式来实现:将主要由动物和/或植物蜡和/或脂质组成的防水的第二涂料施加到第一涂料上。
例如,第二涂料可包含至少90%重量的动物和/或植物蜡和/或脂质。在这种情况下,第二涂料可包含至少70重量%的动物和/或植物蜡。
第一涂料和/或第二涂料可通过喷涂来施加。
换句话说,通过施加由天然蜡和/或油或脂肪的层,可使施加在纤维素基材上的密封层防水和防潮。天然蜡和/或脂质主要由脂肪酸的酯组成,并且作为油溶性产物根据测试方法CEC-L-33-A-93是可易于生物降解的。因此,整个经涂覆的包装主要由纤维素纤维、任选地另外的天然成分和天然脂质或蜡组成,从而可以环保的方式进行弃除,但也可被回收利用。
在实践中,第二涂料可包含以下成分中的至少一种:
·亚麻籽油,
·巴西棕榈蜡,和/或
·蜂蜡。
亚麻籽油用于提高形成第二涂料的油蜡混合物的延展性,并最大限度地降低干燥后的脆性。应使用药用的、即完全澄清的纯亚麻籽油。亚麻籽油是为数不多的硬化油之一,并且几个世纪以来一直用于浸渍木材。然而,单独一层亚麻籽油是开孔的,因此允许水和空气部分地通过,并且不适合于食品包装的持久密封。
巴西棕榈蜡是一种非常硬的热带蜡,其具有高的熔点(约85-89℃)。它本身几乎没有任何气味或味道,并且是防水的。它在干燥状态下非常脆,在几秒钟内***。由于其硬度,它也非常耐磨。它被批准用于食品的包装,并且长期以来一直用作涂层以延长例如芒果、糖果等的保质期。
蜂蜡是一种在欧洲产的蜡,其硬度低于巴西棕榈蜡。当与巴西棕榈蜡混合时,蜂蜡有助于降低脆性。它几乎没有任何固有气味或固有味道,并且同样被批准用于食品。它的熔点为约65℃。特别地,第二涂料可包含以下成分:
·20至30重量%的亚麻籽油,
·40至60重量%的巴西棕榈蜡和
·30至40重量%的蜂蜡。
这种混合物具有三种成分的积极特性,即高的密封性和耐磨性、中性的固有气味或固有味道以及在环境温度下的高柔韧性。这种混合物的涂层特性与位于其下方的由纤维素微原纤维或纤维素纳米原纤维组成的层的涂层特性相结合非常好地适合于满足对食品包装所提出的防水和气密性要求。
在实践中,用于制造第一涂料的可流动的第一涂料溶液可具有溶解在水中的纤维素纳米原纤维或纤维素微原纤维。纳米纤维素具有中值直径在30至100nm的范围内的纤维素微原纤维和/或中值直径在5至20nm的范围内的纤维素纳米原纤维。在此,工业上分布的纤维素原纤维通常是微原纤维和纳米原纤维的混合物。在实践中,2重量%的纳米纤维素在98重量%的水中的混合物已被证明适用于第一涂料。如果选择较高的纤维素含量,则可减少或避免含纤维的基材因水分而变形,并缩短干燥时间。在实践中,2至10重量%的第一涂料溶液的纤维素含量是合适的。
然而,存在其他有机材料,其在涂层中提高纤维素基材对气体渗透的密封性。例如,酪蛋白粉可与水混合并用氢氧化钙变性。酪蛋白提高基材的密封性和机械强度。用氢氧化钙变性的酪蛋白也具有一定程度的防水性。也可以用小苏打使酪蛋白变性,但这并不能使其防水。具有酪蛋白的涂层特别适用于乳制品,在乳制品的制造中可产生酪蛋白。酪蛋白涂层的强度增强作用使基材能够用作例如塑料的替代品,例如在一次性餐具的制造中。一次性餐具也可由带有防水的第二层的经纤维素涂覆的基材制成。然而,酪蛋白涂层可显着增加强度,这例如在使用所述基材形成刀具时很重要。
在实践中,将30g酪蛋白粉用100ml水溶胀约8至10小时,加入30g氢氧化钙并搅拌。再加入50ml水后,将溶液过筛并用于涂覆。这种涂层可在用纤维素纤维涂覆后或者替代地用纤维素纤维涂覆后施加。第一涂料也可同时包含纤维素纤维和酪蛋白。
乳清也适合作为第一涂料的成分。乳清可通过加热(90-100℃)而变性。作为第一涂料的成分的乳清也提高涂覆基材的强度。乳清涂层本身不防水,并因此必须用第二涂料防水。
最后,凝胶形成成分如琼脂(来自藻类的明胶)或车前子壳(车前草种Plantagoindica,Plantago afra的种子壳)适合添加进第一涂料。为此,例如将琼脂粉与水混合并在100℃下变性1分钟。当冷却时,它会***并凝胶化。凝胶可施加至基材并形成薄层,所述薄层封闭基材的孔隙、提高强度并排斥水。
将磨碎的车前子壳浸泡在水中并在溶胀约20分钟后施加到基材上时,可获得类似的效果。
如上所述,第一涂料的组分可在溶解于水中的同时施加。然而,也可在多个施加过程中将非防水的第一涂料的各种成分施加到基材上。
在施加由天然蜡和脂质组成的第二涂料之前,可先干燥第一涂料。含水的第一涂料不与由油和蜡组成的第二涂料混合,从而在施加第二涂料之前需要完全干燥。
如开头所述,基材本身由纤维素纤维形成。特别地,基材可在纤维浇铸工艺中在有或没有随后的压制或热成型的情况下被制造成薄壁产品。
基材可采取许多不同的形状,例如以下的形状
·杯;
·锅;
·容器;
·刀具;
·叉子;
·勺子;
·碟子。
基材可用作食品包装或一次性厨房器皿或餐具。特别是当用作一次性餐具时,利用第一涂料的各种成分可实现的提高的强度是相当重要的。
此外,目的是胶囊的制造,在所述胶囊中填充有用于制备饮料的粉末、特别是经研磨的咖啡。单独包装的咖啡分装包装越来越受欢迎。在此,使用各种包装技术。纯铝包装具有高度的密封性,并且可以让包装在其中的咖啡长期保存。然而,它在包装的制造中也需要高能耗和高材料成本,并导致大量浪费。所谓的咖啡包是包装在纤维素无纺布中的咖啡分装(Kaffeeportionen)。这种包装比铝包装更轻并且能更容易生物降解。然而,所述包缺乏密封性,从而包装在其中的咖啡不能长时间存放或失去香气。
由此处描述的基材构成的胶囊组成的咖啡分装包装具有高度的密封性,其远高于由未涂覆的纤维素纤维制成的包的密封性。因此,可将咖啡保存更长时间。胶囊可用覆盖层密封,该覆盖层例如由具有上述涂层的纸层组成。这种胶囊仅由天然原料组成,即纤维素和天然蜡以及脂质,并且可很容易地处理或回收利用。
为了制造胶囊,可首先在纤维浇铸工艺制造托盘,即具有多个凹陷的单层主体。首先用具有纳米纤维素的悬浮液喷淋该托盘和凹陷。在干燥该第一涂料后,将由蜡和油组成的混合物,特别是由25重量%的亚麻籽油、50重量%的巴西棕榈蜡和25重量%的蜂蜡组成的混合物作为第二涂料施加。可喷涂该第二涂料或将具有第一涂料的基材浸入该混合物中,其中,然后将蜡/油混合物通过加热深入渗透到具有第一涂料的纤维素基材的孔中并均匀分布。以这种方式提高最终产品的密封性。
所述托盘也可在喷涂第一涂料之后被压制,特别是通过加热模具。由此加快干燥过程。
将第二涂料的蜡和脂质加热至例如90℃以保持液态。用于第二涂料的材料的加热储存器可紧邻用于第一涂料的干燥通道布置。也可加热用于施加第二涂料的喷嘴。第二涂料在短时间内(几秒钟)冷却并在此过程中硬化。然后可使用食品包装。
然后用预定量的咖啡填充由托盘中的凹陷形成的胶囊,并且之后用密封件封闭。所述密封件可由纸层组成,该纸层同样具有由纳米纤维素组成的第一涂料和由动物和/或植物蜡和/或脂质组成的第二涂料,以使其气密且防水。
使用与托盘形状精确匹配的工具进行密封,并且将密封件放置在托盘的纤维浇注杆上的用咖啡填充的凹槽之间。所述工具有约5mm宽的金属杆,其可放置在托盘的凹槽之间的杆上。可将工具加热并加压压到托盘上,如有必要,在配合模具中。配合模具可对托盘的杆施加必要的压力,并将托盘准确固定到位,以便能够进行密封。
密封后,可将托盘切割成单独的胶囊。但也可切割具有多个胶囊的更大的部分,然后可用剪刀或通过在托盘的两个凹槽之间的密封杆中延伸的穿孔线处进行分离而将所述多个胶囊分开。
然而,可以看出,经涂覆的基材也适用于其他物品的包装,特别是为了保持新鲜度而以高度气密的方式包装的食品。特别地,干燥的食品例如调味料或做汤用的粉末可被包装在具有这种涂层的杯中。以这种方式涂覆的基材也可用作餐盘或饮水杯,其中它们与水短暂接触。
Claims (15)
1.制造涂覆基材的方法,其中将可流动的、可生物降解的并且提高气密性的第一涂料施加到含纤维素的基材上并将该第一涂料固化以形成涂层,其特征在于,将主要由动物和/或植物蜡和/或脂质形成的防水的第二涂料施加到第一涂料上。
2.根据权利要求1所述的方法,其特征在于,所述第二涂料包含以下成分中的至少一种:
·亚麻籽油,
·巴西棕榈蜡,和/或
·蜂蜡。
3.根据权利要求2所述的方法,其特征在于,所述第二涂料包含:
·20至30重量%的亚麻籽油,
·40至60重量%的巴西棕榈蜡和
·30至40重量%的蜂蜡。
4.根据前述权利要求之一所述的方法,其特征在于,可流动的第一涂料具有水和以下成分中的至少一种:
·纤维素纤维;
·酪蛋白;
·乳清;
·琼脂;
·车前子壳。
5.根据权利要求4所述的方法,其特征在于,所述第一涂料具有溶解在水中的纳米纤维素,所述纳米纤维素具有中值直径在30至100nm的范围内的纤维素原纤维和/或中值直径在5至20nm的范围内的纤维素原纤维。
6.根据前述权利要求之一所述的方法,其特征在于,第一涂料的纤维素含量为2至10重量%或更多。
7.根据前述权利要求之一所述的方法,其特征在于,在涂覆所述第二涂料之前干燥第一涂料。
8.根据权利要求7所述的方法,其特征在于,所述第一涂料在两个或多个单独的涂覆过程中施加。
9.根据权利要求8所述的方法,其特征在于,在所述涂覆过程中施加不同的组分。
10.由纤维素制成的涂覆基材,其中可生物降解的第一涂料提高气密性,其特征在于,主要由动物和/或植物蜡和/或脂质组成的防水的第二涂料布置在所述第一涂料上。
11.根据权利要求10所述的基材,其特征在于,所述第二涂料包含以下成分中的至少一种:
·亚麻籽油;
·巴西棕榈蜡;
·蜂蜡。
12.根据权利要求11所述的基材,其特征在于,所述第二涂料包含:
·20至30重量%的亚麻籽油,
·40至60重量%的巴西棕榈蜡和
·30至40重量%的蜂蜡。
13.根据权利要求10至12之一所述的基材,其特征在于,所述第一涂料具有以下成分中的至少一种:
·纤维素纤维,特别地中值直径在30至100nm的范围内的纤维素原纤维和/或中值直径在5至20nm的范围内的纤维素原纤维;
·酪蛋白;
·乳清;
·琼脂;
·车前子壳。
14.根据权利要求10至13之一所述的基材,其特征在于,所述基材主要包含纤维素纤维。
15.根据权利要求10至14之一所述的基材,其特征在于,它具有至少一种以下物品的形式:
·杯;
·锅;
·容器;
·刀具;
·叉;
·勺子;
·盘子;
·咖啡胶囊。
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DE102019131233.7A DE102019131233A1 (de) | 2019-04-24 | 2019-11-19 | Barriereschicht für Cellulosesubstrat |
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