CN103025615A - 源自基于纤维的板的容器和制备该容器的方法 - Google Patents

源自基于纤维的板的容器和制备该容器的方法 Download PDF

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CN103025615A
CN103025615A CN2011800356824A CN201180035682A CN103025615A CN 103025615 A CN103025615 A CN 103025615A CN 2011800356824 A CN2011800356824 A CN 2011800356824A CN 201180035682 A CN201180035682 A CN 201180035682A CN 103025615 A CN103025615 A CN 103025615A
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I.海斯卡南
T.赖萨南
J.拉萨南
T.拉米
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Stora Enso Oyj
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Abstract

本发明涉及由基于纤维的板制备的容器，其中该容器包含筒体和底部，所述底部包括聚合物涂覆的板，所述筒体的至少一侧为未涂覆的且筒体通过沿着侧缝将筒体的两个边缘密封在一起而形成。本发明还涉及制备所述容器的方法。

Description

源自基于纤维的板的容器和制备该容器的方法
发明领域
本发明涉及包含底部和筒体的容器。本发明还涉及制备所述容器的方法。
背景技术
通常，涂覆聚合物的板在预期用于液体食品和其它基于液体的或湿产品的容器和包装中使用。由涂覆聚合物的板制备的包装和容器所盛放的典型产品包括不同液体和湿的食品，如乳制品、水、果汁、酒、咖啡和其它热饮、汤、点心和加工的食品。
包装或容器的内部聚合物层保护板抵抗潮湿和润湿，且根据聚合物等级，对封闭的包装中包含的产品防止了氧气和串味。该聚合物也可保护板以抵抗产品中包含的油脂或脂肪。而且，该聚合物涂层使得当制备包装或容器时可热封板。除了聚合物涂覆的内表面，硬纸板包装或容器的内部切割边缘或所谓的毛边可暴露于湿产品或液体产品，该液体可能通过边缘吸收至板中。为避免此种情况，该板可在其边缘附近折叠，使得毛边隐藏在接缝的包装或容器的壳体中或将它们翻转至其外表面上，或可削割板的边缘且随后叠为两层，使得毛边闭合。解决毛边吸收问题的另一方法为通过板的合适的施胶(sizes)防止吸收。
制备不渗透液体和气体的板容器或包装的另一方式为提供用于与金属箔一起包装的板。然而，该包装的缺点包括高制造成本、箔层的非生物降解能力和包装材料再生的问题。
包装的环保正变得越来越重要，即它们为可再循环的和/或生物可降解的。基于纤维的包装的一个大的优点为它们可再循环。然而，目前使用的用于包装食品或液体的基于纤维的容器或包装为箔或聚合物叠层的，使得所使用的包装更难以再循环。
将生物可降解的聚合物用于容器和杯子的涂层是一种可选方案。然而，生物可降解的或非生物可降解的聚合物的存在在板的再循环过程中仍然引起问题，因为板的制浆性能降低。而且，生物可降解的聚合物非常昂贵且更难以压制为板。
因此，需要更加环保的容器，该容器的制备更加经济有益，同时其适合包装食品和/或液体。
发明内容
本发明的一个目的是提供环保的容器，其适合包装产品，如食品和/或液体。
本发明另一个目的是提供抵抗液体和/或油脂的容器。
本发明另一个目的是以经济有益的方式制备环保的容器的方法。
该目标和其它优点通过独立权利要求实现，且所述容器的优选实施方案在从属权利要求中限定。
本发明涉及由基于纤维的板制备的容器，其中该容器包含筒体和底部，所述底部包括聚合物涂覆的板，所述筒体的至少一侧为未涂覆的且筒体通过沿着侧缝将筒体的两个边缘密封在一起而形成。
已表明在筒体至少一侧未涂覆的板和在容器底部涂覆聚合物的板的组合足以制备抵抗液体和/或油脂的容器。因此根据本发明的容器适合于包装食品和/或液体。
优选筒体面向容器内侧的一侧是未涂覆的。已表明容器的筒体上未涂覆的板当与底部涂覆聚合物的板组合时具有抵抗液体和/或油脂的足够抗性。所使用的未涂覆的板可为用于包装的任何常规板。如果该包装包含将被消费的食品或其它产品，那么重要的是该板满足食品板的需要。
该侧缝优选抵抗液体和/或油脂。该侧缝优选覆盖筒体的毛边。筒体的毛边，即筒体的切割边缘，是基于纤维的材料制备的容器对液体或油脂的渗透最敏感的地方。通过覆盖毛边，优选通过带子覆盖，它们被覆盖且因此液体或油脂不会渗透进入容器。
筒体边缘优选重叠。以这种方式，当它们沿接缝密封时，筒体的毛边以更加牢靠的方式覆盖。
优选容器的底部和筒体通过热封彼此连接。因为容器的底部包括聚合物涂覆的板，可将筒体和底部彼此热封在一起。
该基于纤维的板优选以增加的胶料水平(sizing level)提供。增加的胶料水平也将改善容器对液体或油脂的抗性，即其对所包装产品的抗性。胶料水平取决于产品的最终用途。如果容器包含液体，筒体的未涂覆的板(面向容器的内侧)的Cobb值(水吸收)，应低于25g/m2(60秒)，根据ISO535测量。未涂覆的基于纤维的板可具有长时间对水的抗性，优选Cobb值(水)低于100g/m2(1小时)，根据ISO535测量。
该容器优选为杯子形式。
本发明还涉及制备包含底部和筒体的纸板容器的方法，其中该底部包括聚合物涂覆的板，筒体的至少一侧包括未涂覆的板，且其中筒体的至少两个边缘沿着接缝密封在一起从而形成筒体，且底部和筒体彼此连接以形成所述容器。
该接缝优选受热以熔融侧缝，使得筒体的两个边缘被密封。以这种方式，形成紧密密封，即抵抗液体和/或油脂的密封。该筒体和底部优选通过热封彼此连接。热封是众所周知的技术且当形成容器时优选使用该技术。以这种方式可使用常规机器用于热封包装。
发明详述
出人意料的发现在容器的筒体上使用未涂覆的板与在底部的聚合物涂覆的板的组合赋予容器良好的抵抗性质，例如抵抗液体和/或油脂的性质。
通过减少容器的聚合物的量(这是由于聚合物涂覆的板的量减少)而仍能实现良好的对液体和/或油脂的抗性，可制备更加环保的容器。出人意料的且与之前的知识不同的是，已表明基于纤维的板可比预期更好的抵抗液体和/或油脂。已表明通过保护底部和容器的筒体的侧缝，实现对所包装的产品，如食品和/或液体的充分保护。
该容器由至少两部分组成，一个筒体和一个底部。底部包括聚合物涂覆的板且成形为任何常规形状。如果容器为杯子形，则底部优选为圆形。可使用任何常规聚合物涂层。优选的使用可热封的聚合物和/或生物可降解的聚合物。因为容器中聚合物的总量降低，使用生物可降解的聚合物的成本不那么高，因此可使用生物可降解的聚合物且仍然能制备有经济效益的容器。
该筒体在至少一侧包括未涂覆的板。该未涂覆的板优选形成容器的内侧。该筒体通过将板的两个边缘连接在一起而形成，其通过重叠或邻接边缘且随后将边缘沿接缝密封在一起。该接缝优选通过加热的带子形成，从而形成抵抗液体和/或油脂的接缝。以这种方式，筒体的边缘(即毛边)被保护以抵抗所填充产品的液体和/或油脂。对于密封的接缝必须经受所填充产品多长时间的应变，根据最终用途有不同的需求。
该底部和筒体优选通过热封彼此连接从而形成所述容器。因为底部包括聚合物涂覆的板，可以以常规方式将底部和所形成的筒体彼此热封。该底部也可胶粘至筒体。
面向筒体内侧的筒体侧优选为未涂覆的，即在板的表面没有聚合物涂层或矿物涂层。另一侧(形成容器筒体的外侧)可被涂覆，优选以矿物涂覆，以提供给容器良好的印刷性质。
基于纤维的板可为内部施胶或表面施胶。根据在容器中包装的产品和容器的最终用途，该板可配有内部胶料和/或表面胶料。胶料将减少板的孔隙度。如果容器将盛放液体，可将疏水性胶料添加至板。如果容器将盛放具有油性表面的产品，如食品或油性备件，该板可包含具有表面阻挡趋向的表面胶料。常用的胶料试剂为淀粉、PVA、CMC、SA(苯乙烯丙烯酸酯乳剂)、SAE(修饰的苯乙烯丙烯酸共聚物、SMA(苯乙烯马来酸酐)、氟化学品、聚氨酯、AKD和ASA，但也可使用其它已知的胶料试剂。优选的可使用疏水性胶料试剂和表面密封添加剂二者。
优选可增加板的胶料水平。根据使用的胶料，需要不同量的胶料以实现所需的对液体和/或油脂的抵抗。例如，AKD胶料的量应高于1kg/t，ASA胶料的量应高于0.75kg/t，松香胶料的量应高于2kg/t。
通过在内部或在板的表面添加胶料，板抵抗液体(如水)和油脂(如油、脂肪)等的抗性增加。如果该容器将盛放液体，优选筒体的板的未涂覆的侧具有的Cobb值(水吸收)低于25g/m2(60秒)，其根据ISO535测定。如果该容器用于长时间储存液体，优选Cobb值低于20g/m2(60秒)。该Cobb值(1小时，水)优选低于100g/m2，更优选低于80g/m2，甚至更优选低于60g/m2。如果该板要抵抗液体更长时间，那么使用的胶料的量可例如为AKD胶料大于2kg/t，ASA胶料大于1.25kg/t或松香胶料大于3kg/t。
根据本发明的容器的另一优点为，对容器所使用的纸板的一侧进行施胶经常就是足够的。以这种方式，成本降低且操作性改善。而且，该容器也可仅表面施胶纸板，即可能无需在板的中间层添加内部胶料。
容器的底部包含聚合物涂层，其既增加对液体和/或油脂的抗性，又使得可将筒体和底部通过热封彼此连接。热封是用于密封包装和制备紧密密封的众所周知的技术。
容器的形状可改变，但一个优选的形状为杯子形。杯子的筒体可向上呈圆锥形地扩展。圆锥形杯子相当于由板制成的常规饮料杯子。该杯子可进一步包含轧制的轮缘和其它与杯子相关的额外特征，如把手。
该容器可用于许多不同食品包装(例如饮料杯子)，如外带食品的容器，以用于包装糖果或蜜饯或包装金属或备件。然而，其它最终用途也是可能的，且在根据本发明的容器的保护范围内。
该基于纤维的板优选为由纤维素纤维制成。可使用任何种类的纤维，包括硬木和软木纤维。
应理解本文所述的实施方案有许多改变，它们也在所附权利要求限定的发明范围内。

Claims (11)

1.由基于纤维的板制备的容器，其中该容器包含筒体和底部，所述底部包括聚合物涂覆的板，筒体面向容器内侧的一侧为未涂覆的且筒体通过沿着侧缝将筒体的两个边缘密封在一起而形成，其中未涂覆的基于纤维的板具有的Cobb值(水)低于100g/m2(1小时)，其根据ISO535测定。
2.根据权利要求1的容器，该侧缝抵抗液体和/或油脂。
3.根据上述权利要求任一项所述的容器，其中该侧缝覆盖筒体的毛边。
4.根据上述权利要求任一项所述的容器，其中该侧缝为带子。
5.根据上述权利要求任一项所述的容器，其中筒体边缘重叠。
6.根据上述权利要求任一项所述的容器，其中容器的底部和筒体通过热封彼此连接。
7.根据上述权利要求任一项所述的容器，其中未涂覆的基于纤维的板具有的Cobb值(水)低于25g/m2(60秒)，其根据ISO535测定。
8.根据上述权利要求任一项所述的容器，其中所述容器为杯子。
9.制备包含底部和筒体的基于纤维的容器的方法，其中该底部包括聚合物涂覆的板，筒体的至少一侧包括未涂覆的板且其中筒体的至少两个边缘沿着接缝密封在一起从而以以下方式形成筒体，即筒体面向容器内侧的一侧为未涂覆的且底部和形成的筒体彼此连接从而形成所述容器。
10.根据权利要求9所述的方法，其中所述接缝经受热以熔融侧缝，使得筒体的两个边缘被密封。
11.根据权利要求9-10任一项所述的方法，其中所述筒体和底部通过热封彼此连接。
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