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CN102918128A - 使用低粘性胶粘剂的可再封闭包装 - Google Patents

使用低粘性胶粘剂的可再封闭包装 Download PDF

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CN102918128A
CN102918128A CN2011800226553A CN201180022655A CN102918128A CN 102918128 A CN102918128 A CN 102918128A CN 2011800226553 A CN2011800226553 A CN 2011800226553A CN 201180022655 A CN201180022655 A CN 201180022655A CN 102918128 A CN102918128 A CN 102918128A
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packing
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tackiness agent
adhesive
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CN102918128B (zh
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D·J·罗梅奥
L·S·曼恩
P·A·泽法斯
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Intercontinental Great Brands LLC
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Kraft Foods Global Brands LLC
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Abstract

在初始打开和降低包装中的顶部空间之后设置为再封闭的包装(10)包括多个具有一对相对壁片段的壁(32，34)，其中每一个相对壁片段具有顶边和底边部分、宽度、高度和朝内表面。将多个壁密封以形成内部空腔来在其中接受物品，所述空腔被底壁片段和初始可移动地密封的上部开口(52)界定。所述包装还包括低粘性胶粘剂区域(14)，其跨过整个宽度配置，并且沿着朝内表面的至少大多数高度从相邻的口朝向底壁片段延伸。胶粘剂区域对彼此比对物品的粘附具有更大的亲和力，以允许包装能在多个不同的高度反复再打开和再封闭，使得顶部空间最小化。

Description

使用低粘性胶粘剂的可再封闭包装
相关申请的交叉参考
本申请要求2010年2月26日递交的美国临时申请系列号61/308540、2010年3月25日递交的美国临时申请系列号61/317592、2010年10月27日递交的美国临时申请系列号61/407406和2010年10月27日递交的美国临时申请系列号61/407409的权益，所有这些专利申请文件在此通过参照以其全部结合到本文中。
领域
本文描述了可再封闭包装，具体地，使用低粘性胶粘剂来再封闭包装的可再封闭包装。
背景
包装，例如由柔性材料制成的包装，通常在运输、储存和被使用者消耗期间用于储存物品(items)。常见类型的先前包装由膜材料的网大规模生产。通过将网的纵向边缘密封在一起，网形成为连续的管。通过在横向密封的区域横跨管状包装密封和切割，该连续的管状包装可随后单数化为较小的包装。
通常，在被消费者购买之前，现有包装在密封的内部空腔内初始储存物品。消费者可随后破坏密封之一或除去包装的一角以接近内部空腔和其中的物品。在初始破坏之后出现的一个问题是如何有效再封闭包装。通过使用连锁拉链条可实现再封闭，包括具有滑动机理的那些，例如在美国专利号5,007,143中讨论的。然而，该方案局限于在包装的顶部沿着拉链条再封闭包装，导致当将物品除去时产生顶部空间。此外，加入拉链条的成本可提高包装的成本。
如果提供不具有再封闭特征的包装，通常的实践是折叠包装的边缘，以降低物品之上的顶部空间和封闭已破坏的密封。随后可在折叠的材料之上施用夹子，使得包装保持在该封闭的状态。然而，该实践通常不能充分封闭包装，并且如果消费者没有夹子，则包装可打开并且完全暴露物品。
发明概述
本文描述了一种包装，该包装设置为在初始打开和随后从包装内除去物品之后，在渐进接近包装底部的多个不同的位置再封闭，以降低在物品之上在包装中的顶部空间。所述包装包括一对相对壁，其各自具有至少一个胶粘剂区域，该胶粘剂区域至少部分含有基本上跨过包装内部的整个宽度延伸的低粘性胶粘剂。当将相对壁压在一起时，胶粘剂区域再封闭包装。通过对自身比对其中储存的物品具有更大的亲和力，低粘性胶粘剂特别有效用于再封闭包装，允许低粘性胶粘剂粘附于自身，即使低粘性胶粘剂与物品接触。当将物品从包装序贯除去并且包装再封闭时，在物品之上产生顶部空间。胶粘剂区域的尺寸可允许相对壁在与物品密切相邻的高度压在一起，以在该位置再封闭包装，从而使在包装中的顶部空间最小化。包装还可包括一个或多个可分离的易毁坏区域，以允许包装的上部部分在包装的再封闭的部分之上被除去。
该包装可提供许多优点。例如，由于降低在包装中的顶部空间，可减少在再封闭的包装中的空气。此外，如果胶粘剂区域沿着包装的多个高度配置，则包装可在多个高度再封闭，当在不同的时间将物品序贯除去时，允许包装在与其中储存的物品密切相邻处再封闭。最后，任选的易毁坏区域可允许过度的包装被除去，这样提供更容易接近物品。
在一方面，包装可包括多个具有一对相对壁片段的壁，其中每一个相对壁片段具有顶边和底边部分、宽度、高度和朝内表面。将多个壁密封以形成内部空腔来接受物品。空腔的下面被底壁片段界定，空腔的上面被初始密封的上部开口界定，但是可除去以允许初始接近物品。所述包装还包括在相对内表面上并且基本上跨过相对内表面的整个宽度配置的低粘性胶粘剂区域。胶粘剂区域可沿着相对壁片段的至少大多数高度朝向底壁片段从相邻的口延伸。胶粘剂区域对彼此比对物品的粘附可具有更大的亲和力，并且允许包装在相对壁片段的多个不同的高度使用胶粘剂区域再封闭。当在不同的时间将物品从包装序贯除去时，在多个不同的高度再封闭包装可允许在物品之上包装中的顶部空间最小化。
在另一方面，包装可包括至少两个具有朝内表面的壁，其中至少两个壁沿着其纵向边缘部分彼此密封，以形成管状预包装。管状预包装在其顶边和底边部分上初始密封，形成具有储存物品的内部空腔的初始密封的包装。包装还可包括以以下样式(pattern)配置的低粘性胶粘剂：在至少两个壁的朝内表面的排列对齐部分上，基本上横跨管状包装的圆周。优选，样式在顶边和底边部分的中间配置。此外，低粘性胶粘剂对自身比对物品的粘附具有更大的亲和力，在通过在朝内表面上配置的低粘性胶粘剂的压力序贯除去物品之后，有效允许包装与物品相邻再封闭在一起。
附图简述
图1为可再封闭包装的透视图，其显示在其初始封闭的结构和在填充水平的物品时的开口；
图2为图1的可再封闭包装的截面侧视图，其沿着图1的线2-2取并且显示在填充水平的物品；
图2A为图2的截面侧视图的放大部分，其显示可再封闭包装的膜壁的层；
图3为图1的可再封闭包装的透视图，显示在具有在填充水平的物品的敞开结构中的开口，并且显示一部分包装的局部剖视图；
图4为图1的可再封闭包装的透视图，其在初始打开开口、并经由该开口除去一些物品之后，并且显示中间水平的物品和在物品之上的密封的相对壁；
图5为图4的可再封闭包装的剖视图，其显示中间水平的物品和在物品之上的密封的相对壁；
图6为图1的可再封闭包装的透视图，其在初始打开开口、并经由该开口除去甚至更多物品之后，并且显示低水平的物品和在物品之上的密封的相对壁；
图7为图6的可再封闭包装的剖视图，其显示低水平的物品和在物品之上的密封的相对壁；
图8为图1的可再封闭包装的透视图，其显示在中间水平、在物品之上、在密封的相对壁之上的除去的部分；
图9为柔性材料的单一网俯视图，其显示低粘性胶粘剂的样式；和
图10为柔性材料的单一网俯视图，其显示低粘性胶粘剂的样式。
发明详述
提供可再封闭包装10以允许使用者再封闭包装10，同时还降低在包装10内部储存的物品12之上的顶部空间，同时将物品12从可再封闭包装10序贯除去，物品12可为适于包装10的任何产品，例如食物产品，包括但不限于薄脆饼干、曲奇饼、奶酪、肉、咖啡、坚果、干果、调味品等或序贯除去的其它产品，例如压缩磁盘、电池或办公用品，仅举几例。在本文描述的示例性实施方案中，就食物来描述物品。
本文描述的可再封闭包装至少部分通过使用在可再封闭包装10的相对内表面16上配置的低粘性胶粘剂14而实现，其中低粘性胶粘剂14对自身比对食物12的粘附具有更大的亲和力。这允许在相对内表面16上的低粘性胶粘剂14密封在一起，例如通过使用者将相对内表面16压在一起，甚至在除去食物12期间当食物12已与低粘性胶粘剂14接触时。可再封闭包装10可任选包括围绕可再封闭包装10的周边配置的易毁坏区域18，以允许使用者在食物12之上和相对内表面16的相邻的密封区域除去一部分可再封闭包装10，从而降低包装10的尺寸。
在一方面，低粘性胶粘剂14和包装10通常被构建或具有使胶粘剂14与不希望表面或食物12的附着力减至最小并且同时仍然作为有效的可再封闭紧固件起作用的组成。即，胶粘剂14具有获得选择的粘性和剥离值的独特制剂或构造，以使胶粘剂基紧固件可在使用期间被消费者多次打开和封闭以密封包装10中的内容物，但是同时不自形成相对内表面16的膜基材脱层。
为了这个目的，胶粘剂14通常包含具有相对低粘性水平的UV-固化胶粘剂，以将对不需要表面的附着力减至最小，所选择的粘附或打开剥离强度(peel strength)足以能够确保再闭合包装10，并且剥离强度强健到足以能够反复打开和重新闭合包装10。同时，胶粘剂14也与膜基材具有强的附着力，以致在打开包装10时胶粘剂14不脱层。通过一种方法，胶粘剂14可包含UV-可固化的丙烯酸低聚物和粘性控制剂的特定共混物。在其它方法中，胶粘剂14可包含UV-可固化的丙烯酸低聚物、粘性控制剂和弹性体(橡胶)组分的特定共混物。
优选地，胶粘剂14为UV-固化的压敏胶粘剂(PSA)，其呈现粘结性和低粘性，但是尽管低粘性，仍然与形成相对内表面16的膜基材形成强的粘附。如同通常所理解的那样，粘结性基材料通常更易于粘附于相似材料(即自粘附)而不是非相似材料。在此使用的合适的胶粘材料通常与不需要的表面呈现相对低的粘性，但是同时仍然与所要求的表面呈现良好的附着强度(例如不自柔性前后板脱层)，和与相似表面呈现相对好的粘结或自粘附强度以保持软包装或小袋闭合，但是仍然允许包装可被手动打开或剥离。所选择的胶粘剂基材料也允许自这样的相似材料脱粘附(debonding)或剥离，以使粘胶层可被反复剥离而基本不损害胶粘材料和/或任何在下面的基材。当胶粘材料被脱粘附或剥离分开时，所选择的胶粘材料具有足够的内在完整性并且通常基本上洁净地在粘结界面剥离分开而没有明显的材料起毛(picking)、拉丝性、自基材脱层和/或其它显著的材料外形毁损(即起团(globbing)、起球等)。有利地，此处的胶粘剂基紧固件在相对的粘合带相互接触时保持剥离粘着力，其平均初始剥离粘着力大于约200克每线性英寸(gpli)，并且优选地在约200-约900gpli之间。另外，在一些情况中，胶粘剂基紧固件14在5次反复密封和开封操作之后保持大于约200gpli和/或平均初始剥离粘着力的至少约30-约200％。
在另一方面，也构建彼此相互作用的包装10和胶粘剂14，以使胶粘剂14与内基材表面16的附着或剥离强度通常大于胶粘剂14本身各层之间的打开剥离强度。照这样，在消费者打开包装10并剥开胶粘剂14时，胶粘剂14通常保持粘附于内表面16并且基本上不起毛、成线索状(string)或自内表面16脱层。例如，并且在一种方法中，胶粘剂与包装膜基材的粘合或剥离强度大于约900gpli并且能够经受多次剥离和再密封循环，而不与膜基材(film substrate)分离。另外，胶粘剂被固化以致于其能够经受多于100次用甲乙酮(MEK)溶剂进行的来回摩擦(ASTM D5402-06)。
现参照图1-10，由柔性材料顶边和底边部分22、24、42和44以及侧边部分26的单一网20构建可再封闭包装10的示例性形式。在网20形成为包装10之前，可在形成包装10的内表面的网的表面29上以样式28施用或印制低粘性胶粘剂14。低粘性胶粘剂14可改为在形成包装10时在网20上形成。样式28可采用任何合适的形状，包括，例如所有的网20，除了气密密封部分和周围的容限以外基本上所有的网20，在大多数网20上，例如网20的顶部和底部的中间，如图9所示，或者沿着网20的高度间隔的带，如图10所示。然而，样式28优选至少基本上在需要的高度跨越侧边26之间，允许纵向密封部分，使得当形成包装10时，胶粘剂14可形成连续的密封。
在图示说明的形式中，网20可用于形成可再封闭包装10，例如典型的垂直或水平形式、填充和密封类型的小袋，采用该形式，通过在网20的侧边部分26之间的翼片密封30，包装10具有纵向密封的管状形状。包装10包括前壁32和后壁34，各自具有其顶边部分36和底边部分38。包装10还包括连接前壁32和后壁34并且具有顶边部分42和底边部分44的侧壁40。在图示说明的形式中，在前壁32和后壁34的底边部分38之间以及在前壁32和后壁34的底边部分38与侧壁40的底边部分44之间形成底封46。如图示说明的，侧壁40在底边部分44向内折叠以形成底封46，然而，侧壁40也可向外折叠以形成向外延伸的底封。向内折叠侧壁40的底边部分44可产生用于包装10的底片段48，包装10可在该底片段48之上以垂直取向放置。采用另一种形式，当网在相对边缘部分上密封在一起以产生管状形式时，可采用具有低粘性胶粘剂的镜像样式的两个网。在又一种形式中，可沿着包装的底或各侧面制备三角形衬料。
产生底封26时，在具有开口52的包装10内形成内部空腔50，该开口52由前壁32、后壁34和侧壁40的顶边部分36、42形成。如在典型的形式、填充和密封过程中，在形成纵向翼片密封30和底封46之后，空腔50可随后填充食物12。与底封46一样，在前壁32和后壁34的顶边部分36之间和在侧壁40的顶边部分42之间可形成顶封54。在图示说明的形式中，顶封54与包装10的顶边53间隔。该间隔产生凸缘55，该凸缘为使用者在打开包装10时提供把持物，例如通过破坏或除去顶封54。在该方面，顶封54和底封46之一或二者可被除去，是指，例如，顶封54和底封46可初始被破坏，或者整个密封46、54可从包装10除去，例如借助易毁坏区域。采用这种结构，包装10可填充食物12并且气密密封用于储存、运输和展示。通过除去密封46、54中的一个，可随后打开包装10，将食物12除去，通过使用低粘性胶粘剂14将相对内表面16密封在一起而使包装10再密封。
如前面讨论的，在由底封46、顶封54和翼片密封30包住的初始气密密封的条件下，可为使用者提供具有内部空腔50的包装10，内部空腔50用于储存食物12。使用者可随后破坏或除去顶封54，以接近内部空腔50和食物12。在初始破坏或打开之后，当使用者从内部空腔50序贯除去食物12时，在食物12之上产生提高量的顶部空间。使用者可采用低粘性胶粘剂14来序贯降低该顶部空间。
本文提供的包装10在顶封54和底壁片段48的中间在包装10的各个高度可再封闭，尤其是在低粘性胶粘剂14的样式28基本上围绕包装10的圆周延伸的高度。如图示说明的，低粘性胶粘剂14的样式28可覆盖大多数网20，例如朝向包装10的上部部分抵消的区域，如图9所示，或者除了顶边部分22和底边部分24和侧边部分26以外的所有的网20。或者，低粘性胶粘剂14的样式28可由多个横向配置的低粘性胶粘剂14的带组成，例如示于图10的那些。因此，当将一部分食物12除去时，在包装10中产生顶部空间，使用者可在与食物12相邻的高度向内折叠侧壁40，并且在那里配置低粘性胶粘剂14的样式28。在侧壁40已向内折叠后，使用者可将前壁32和后壁34压在一起，将圆周配置的低粘性胶粘剂14压在一起。如以前讨论的，由于低粘性胶粘剂14对自身比对食物12的粘附具有更大的亲和力，使用者施用的压力将低粘性胶粘剂14粘附在一起并且有效再封闭包装10。通过破坏在前壁32、后壁34和侧壁40上配置的低粘性胶粘剂14之间的密封，包装10可随后再打开，提供接近食物12。当序贯除去更多的食物12时，使用者可再封闭与食物12相邻的包装10，通过在相对壁上存在低粘性胶粘剂14的区域内，在使用者设计的多个高度的任一个，针对低粘性胶粘剂14施用压力，以除去在包装10中的另外的顶部空间。该区域可延伸包装10的整个初始内部高度，或者可仅在所选的高度，例如，下三分之一、上三分之一、上大多数、上三分之二或上四分之三。此外，可提供多个间隔的区域，例如25％、20％或10％的分数，并且在该区域位于的包装上任选可包括外部标记，例如图像、易毁坏区域等。
采用一种形式，网20可由若干层柔性材料形成。如图示说明的，网20包括内层56、中间层58和外层60。在一个实例中，内层56为具有可热封的功能的共挤出的膜，基本上由可热封的聚合物组合物(例如聚乙烯、EVA、Surlyn或其共混物)制成；中间层58为金属箔材料，例如铝；和外层60可为PET，例如定向的PET。采用这种结构，广告或其它字母数字或图片内容可在外层60上展示，例如通过印制或粘附标签。层57、58、60的组合用作内部空腔50的阻挡层。
优选地，胶粘剂为UV-固化的，更优选UV-固化的PSA胶粘剂，其呈现粘结性和低粘性，但是仍然与形成包装10的壁32、34和40的膜基材形成强的粘附。如同通常所理解的那样，粘结性基材料通常更易于粘附于相似材料(即自粘附)而不是非相似材料。在此使用的合适的胶粘材料通常与不需要的表面呈现相对低的粘性，但是与所要求的表面呈现良好的附着强度(例如不自柔性前后板脱层)，和与相似表面呈现相对好的粘结或自粘附强度以保持软包装或小袋闭合，但是仍然允许可被手动打开或剥离。所选择的粘结性基材料也允许自这样的相似材料脱粘附(debonding)或剥离，以使粘胶层可被反复剥离而基本不损害胶粘材料和/或任何在下面的基材。当粘附材料被脱粘附或剥离分开时，所选择的粘附材料具有足够的内在完整性并且通常基本上洁净地在粘结界面剥离分开而没有明显的材料起毛(picking)、拉丝性、自基材脱层和/或其它显著的材料外形毁损(即起团(globbing)、起球等)。
胶粘剂的第一组分为一种或更多种UV--可固化的丙烯酸酯或丙烯酸低聚物。例如，UV-可固化的丙烯酸低聚物可为具有多重反应性或官能团的丙烯酸或甲基丙烯酸酯(即丙烯酸或甲基丙烯酸低聚物)。通常，官能团包含一个UV反应活性位点。UV反应活性位点最通常为共轭于另一个不饱和位点例如酯羰基的碳-碳双键。通过一种方法，UV-可固化的丙烯酸低聚物为多官能醇的丙烯酸或甲基丙烯酸酯，这意指低聚物在低聚物的烃骨架上具有多于一个丙烯酸酯化(acrylated)或甲基丙烯酸酯化的羟基。通过一种方法，胶粘剂可包含约1-约90％重量的UV-可固化的丙烯酸低聚物，并且官能度为约1.2-约6.0。在另一种方法中，UV-可固化的丙烯酸低聚物可具有约2.0-约3.0的官能度，和/或提供约20-约70重量％量的胶粘剂。
在一种形式中，多官能的UV-可固化的丙烯酸酯为具有2.0或更大反应性官能度的植物油的丙烯酸酯。在另一方面，UV-可固化的丙烯酸低聚物可包含环氧化的大豆油丙烯酸酯。通常，基于优选的胶粘剂组分比(ACR)(在此被讨论)，所使用的UV-可固化的丙烯酸低聚物的量可影响最终胶粘剂的性能。例如，当基于优选的ACR的UV-可固化的丙烯酸低聚物的量太低时，最终胶粘剂的固化速率太慢。在另一方面，当基于优选的ACR的UV-可固化的丙烯酸低聚物的量太高时，最终胶粘剂可被充分地固化，但是对于密封和再密封可能具有不足够的自粘附性能。
胶粘剂的第二组分为粘性控制剂。通过一种方法，胶粘剂可包含约1-约65％重量的粘性控制剂。在另一种方法中，粘性控制剂可以约20-约65％的量存在。粘性控制剂可包括增粘树脂或可固化聚合物/单体组合，其在固化时可产生适合于可再封闭紧固件的所要求水平的粘性和自身粘附性能。在一个方面，粘性控制剂可包括脂肪族氨基甲酸酯丙烯酸酯化低聚物。适合于可UV-可固化PSA胶粘剂的许多其它类型粘性控制剂也可用于可再封闭的胶粘剂系统。
胶粘剂的任选的第三组分为弹性或橡胶组分。通过一种方法，弹性组分可包括至少一种可固化的丙烯酸酯化(即丙烯酸改性的)或甲基丙烯酸酯化的羟基封端弹性聚合物(即弹性多元醇)的酯。这种弹性组分可包括丙烯酸改性的聚丁二烯、饱和的聚丁二烯和/或柔性聚氨酯。在一个方面，可提供甲基丙烯酸酯化的聚丁二烯。当用于胶粘剂时，弹性材料可以约0-约20％的量提供。在一个方面，弹性材料以约5-约15％的量提供。可制备具有所要求的低粘性、如在此描述的可再封闭性并且不包含弹性组分的令人满意的胶粘剂，然而，确信弹性组分有助于获得最佳涂层性能。最佳胶粘剂性能可通过性能例如自身粘附、粘性、粘度和固化速率限定，仅举几例。弹性组分用于调节剥离强度性能、基材粘附强度、增加柔性、粘度控制和固化速率调节。
适当固化的胶粘剂的平均初始剥离强度可在约200gpli-约900gpli范围，特别是约280gpli-约800gpli，如经ASTMD3330/D3330M-04方法F测量的那样。胶粘剂也被设计在反复打开和封闭操作后保持其平均剥离(即粘性保持)。优选地，所固化的胶粘剂可保持其在约280gpli和约800gpli之间的平均初始剥离粘着力达到至少5次重复剥离-再密封循环。优选地，在剥离-再密封-剥离时的粘附性保留值可在初始值的约30％-约200％之间。在用薄脆饼干(cracker)污染胶粘剂时，粘附性保留值可在初始值的约30％-约150％之间，其中薄脆饼干污染实验方法如在此描述。
在另一种形式中，包装10还可包括一个或多个跨越网20的侧边部分26之间的易毁坏区域18，如图示说明的，存在多个易毁坏区域18，这些易毁坏区域18配置在包装10的一定跨度的高度内，例如从包装的纵向中心朝向包装10的顶部偏出(offset)。或者，可利用任何数目的易毁坏区域18，当多于一个时，彼此纵向间隔，无论在哪里需要包装10的分离。此外，一个或多个易毁坏区域18通常可横跨包装10配置或可以某一角度配置，或者当易毁坏区域18跨越包装的宽度时，含有线性或曲线片段的其它组合。当食物12从包装10序贯除去时，这样配置的易毁坏区域18可被使用者分隔，以降低在食物12之上过量的材料，并且允许更容易接近剩余的食物12和更容易排空食物12。在包装的外部上的图片或其它标记可与一个或多个易毁坏区域重合。
由于部分易毁坏区域18在覆盖气密密封的内部空腔46的一部分包装10上配置，优选易毁坏区域18仅刻痕网20，例如通过外层60、内层56，或者外层60或内层56和中间层58的组合。在图示说明的形式中，易毁坏区域18包括一系列小的刻痕(激光或机械的)，然而，可利用刻痕、齿孔、薄的模具线的其它样式、形状和尺寸等。
在此说明的示例性实施方案中，可再封闭包装10具有通常为长方形的横截面，具有四个边。然而，在使用中，包装可采用充分柔性材料的任何合适的形状，包括，例如，曲线形状，例如通常为圆形或椭圆形，或具有线性截面的形状，例如三角形、四边形、六边形、八边形或其它规则或不规则的多边形。这样的形状可与部分柔性材料一起使用，以允许将可再封闭包装10的各侧面压在一起。此外，各侧面可通过折线或密封连接。因此，各侧面可能不彼此分离，例如，包含膜的单独的网，而是通常可具有含有多个侧面或壁的外观。
如此处讨论的，已结合食物12描述了包装10。食物12可包括任何合适的食物材料，包括固体、液体或其组合。此外，包装10可用于储存其它材料，例如任何合适的塑料、金属、有机材料或其组合。
在此描述的胶粘剂的优点和实施方案通过以下实施例进一步说明；然而，在这些实施例中记载的具体条件、加工流程、材料及其量以及其它条件和细节不应构成对该方法的不适当限制。所有百分比为重量百分比，除非另外指明。
实施例
实施例1
对丙烯酸低聚物、粘性控制剂和弹性材料的多种共混物测试适配性和储存稳定性(稳定性定义为室温下储存长达3天后不形成凝胶或肉眼可见的分离的混合物)。下表1显示所测试的组合及所采用的制剂水平。
表1：用于稳定性试验的胶粘剂制剂
Figure BPA00001635246500131
组分被确认如下：
A＝丙烯酸酯化的环氧化豆油(CN 111 US，Sartomer公司，Exton，PA)。
B＝甲基丙烯酸酯化的聚丁二烯(Ricacryl
Figure BPA00001635246500132
3500，Sartomer公司)。
C＝增粘的脂肪族丙烯酸酯低聚物(CN 3001，Sartomer公司)。该组分包含脂肪族氨基甲酸酯丙烯酸酯和烃增粘剂树脂的共混物。
D＝聚丁二烯苯乙烯共聚物(Ricon 184，Sartomer公司)。
E＝增粘的脂肪族氨基甲酸酯丙烯酸酯低聚物(CN 3211，Sartomer公司)。
F＝用浅色低嗅芳香树脂制备的增粘剂浓缩液(PRO 11236，Sartomer公司)。
Figure BPA00001635246500141
这些胶粘剂组分的稳定性或适配性可为制备、运输、厂内储存及液体涂料混合物使用的因素。稳定性通过所观察制剂在经3天(约72小时)时期储存后的外观和一致性进行视觉判断。观察到表1中的样品1、2和5提供了各种胶粘剂组分的视觉上令人满意的共混物，其在3天后保持均质，即组分没有肉眼可见的分离或形成凝胶。尽管样品2导致稳定的制剂，该胶粘剂组分具有不合需要的ACR并且没有很好固化(即这点可见于在以下表3中对类似配制的样品10的MEKRub Cure(MEK摩擦固化)试验)。然而，样品1和5提供了很好固化并且也具有在0.5-1.5范围内的所要求的ACR的稳定胶粘剂共混物。其它样品共混物或者分离、变得太粘稠和/或凝胶化(即样品8在3天后变为凝胶样)。样品8形成凝胶，这表明由与增粘剂组分F组合的脂族丙烯酸酯或组分E所形成的组合物不适配。
因此，为了得到适合于在此所公开用途的稳定胶粘剂，稳定胶粘剂通常需要具有一种以下，并且在一些情况中多于一种以下，和在其它的情况中全部以下的因素：可适配组分、可固化、所要求的ACR和存在全部三种组分部分(即丙烯酸低聚物、弹性体和粘性控制剂)。
实施例2
基于对来自实施例1的稳定制剂的初始胶粘剂适配性结果，这些制剂被进一步提炼以产生作为表2中所指明组分的共混物全部稳定至少24小时的5个胶粘剂涂料制剂。
表2：修正的胶粘剂制剂
Figure BPA00001635246500151
组分A-F如以上在实施例1中指明。样品9和10分别与实施例1的样品1和2相关。样品11为来自实施例1的样品5的变体。剩余的样品制剂为新的。
在5种胶粘剂制剂呈现良好适配性至少1天之后，5个样品均与约1％的光引发剂(Esacure
Figure BPA00001635246500152
KTO 46，Lamberti Spa，意大利)合并，然后进一步试验。光引发剂包含三甲基苯甲酰基二苯基氧化膦、α-羟基酮和苯甲酮衍生物的液体混合物。然后样品被涂布到包含乙烯-醋酸乙烯酯共聚物(EVA)、金属茂线性低密度聚乙烯(LLDPE)和约12％有机粘土组合物(约57-63％有机改性粘土和马来酸酐接枝线性低密度聚乙烯载体，PolyOne Corporation，McHenry，IL)的薄膜基材上。具体地讲，基材具有约77重量％(EVA)、约10重量％金属茂LLDPE和约13重量％有机粘土组合物。然后在将样品涂布到薄膜基材上之后进行固化，其中固化通过施用在为卤化铁的水银灯泡的“D”灯下的带有三通路的UV辐射来实现。在D灯下的单通路大约相当于75mJ/cm2-100mJ/cm2。在涂层固化后，评价所固化的胶粘剂层的固化程度和附着于薄膜有效性。
胶粘剂的固化程度采用称为甲乙酮(MEK)摩擦试验，按照ASTMD5204的溶剂耐摩擦试验进行测试。良好的固化结果通过100次或者更多次来回摩擦的MEK摩擦值显示，这表明胶粘剂被很好固化并因此显示了其上对MEK摩擦的抗性。不佳固化的胶粘剂不显示对MEK的大的抗性(例如10次来回摩擦或更少次)。MEK摩擦实验结果可见于以下表3中。
也观察到胶粘剂的粘性和初始剥离并进行了主观报导。在触摸时观察到胶粘剂层的粘性并且基于低(L)、中(M)和高(H)等级评价粘性水平。类似地，手工剥开样品所需要的感观力度(subjective force)也基于L、M和H等级评价。这些实验结果可见于表3中。
表3：表2制剂的固化和初步胶粘试验结果
Figure BPA00001635246500161
所有样品具有至少中度的粘性和剥离强度。样品10具有最高的感官粘性和剥离，但是固化最差，如经MEK摩擦试验为约10所证明，这显示在约10次MEK摩擦之后自基材除去胶粘剂。样品12和13在实施MEK摩擦试验时具有混浊性，最可能是由于组分D(聚丁二烯苯乙烯共聚物)在用MEK摩擦时提升至表面。因此，尽管样品12和13落入所要求的粘合比范围内，但是组分D好像是与其它两种组分不适配，并因此不是令人满意的胶粘剂化合物。合乎需要的是发现具有中度或更低的感官粘性结果、中度或更高的感官剥离力以及100次来回摩擦或更多次的MEK摩擦试验而没有形成混浊的胶粘剂，其最少为所呈现的样品9和11。
实施例3
通过向如在实施例2中描述的相同薄膜基材施用胶粘剂，然后以三种不同的方式固化，在市售设备上实施UV-固化步骤(“UV-固化”)，在与UV-固化相似的市售系统上但是采用电子束技术实施电子束(EB)固化步骤(“EB固化”)，并且在实验室设备上实施EB固化(“EB LabCure(EB实验室固化)”)，测试胶粘剂制剂的三种不同变体的固化有效性。下表4显示了所测试的三种胶粘剂制剂。市售EB系统与实验室EB系统两者由于变化各自所提供的能量水平而进行比较。丙烯酸低聚物为CN 111 US，弹性体为Ricacryl
Figure BPA00001635246500171
3500，增粘剂为CN 3001，如在实施例1中描述的那样。
表4：样品胶粘剂制剂
Figure BPA00001635246500172
“UV-固化”包括使涂布的样品在UV灯下以约25ft/分钟在空气中通过约2-4次，以使样品在UV灯的长度下通过2-4次。由1次通过的UV灯在25ft/分钟下提供的能量相当于约100mJ/cm2。在氮气下以约125ft/分钟-约250ft/分钟只通过1次，并在约2Mrad-约2.4Mrad下，在市售系统(Faustel Corporation，Germantown，WI)上实施“EB固化”，并且也在需要约6-8次通过的氮气下，在实验室EB系统下实施“EB Lab Cure(EB实验室固化)”，系统在约10ft/分钟下操作。通过实验室EB装置6-8次的总累计剂量为约2Mrad-约4Mrad。应意识到，在一些情况下，对于良好的胶粘剂-胶粘剂剥离强度来讲，胶粘剂紧固件12的光滑表面光洁度是需要的。如果胶粘剂12的表面为块状的，例如具有柑橘皮的一致性，胶粘剂紧固件12趋于不能很好附着在一起。观察到所有固化的涂层样品具有同等的平滑和水平表面光洁度。在固化所有样品之后，按照ASTM D3330/D3330M-04方法F测试剥离强度，这些结果显示在以下表5中。
表5：不同固化方法的剥离强度结果(紫外光对电子束)
Figure BPA00001635246500173
出人意料地发现紫外光固化处理(UV-固化)优于两种EB固化。在市售线上实施的EB固化根本不粘附，即剥离强度为0gpli。EB实验室固化具有一些粘附，但是UV-固化的样品总体上讲具有最好的粘附。
根据UV-固化结果，样品15和16具有可接受范围的剥离强度(即分别为480gpli和680gpli)，而样品14具有较低的剥离强度(即200gpli)。在样品14所见的较低剥离强度可能是由于对样品14所采用的胶粘剂制剂，其不落入期望的0.5-1.5的范围内(即其具有比率2.2)。
尽管不希望受到理论的限制，但是确信在环境空气(约21％氧气)中的UV-辐射固化由于在临近或接近表面的胶粘剂部分中自由基固化的氧气抑制作用而提供了自样品底部上至其表面的固化。粘性组分在性质上为更加脂肪族的，因此比例如酯或氨基甲酸酯组分的表面能更低。在一些情况中，如果允许有足够时间，化学系统自我组织(self-organize)为最低的可能能态。在该例子中，确信UV方法的较慢固化速率使得能够具有足够时间用于涂层的粘性组分向表面移动。相反，EB固化方法造成反应固化速率快得多，因此提供了聚合物的更加随机的排布，其中在发展聚合物网络中建立交联太快，明显表面能驱动了自身排布(selfordering)的发展。因此，EB固化可比UV辐射方法具有相反的固化模式，其中EB固化通常发生于氮气吹扫的环境中并且可在表面固化较快和在接近基材处较慢。这样仅基于不同的固化方法可导致完全不同的胶粘行为。通常，这样的快速固化将是合乎需要的，然而，当固化在此公开的涂层时，这样的快速固化是不利的，因为这不允许在工艺方法中有足够的时间排出胶粘剂组分以变得完全有组织。
尽管不希望受到理论的限制，但是进一步确信UV辐射固化的较慢固化时间使得发展聚合物单元能够成为自身排列，以致于聚合物的极性单元偏爱基材，而非极性单元偏爱表面，其中在接近基材表面具有非极性单元使得胶粘剂涂层能够与自身附着和粘附。这使得与薄膜基材最适配的胶粘剂组分在胶粘剂/基材界面聚集，因此增强基材粘附，这可为帮助不存在自基材薄膜脱层的一个因素。
实施例4
如在表6中指明的那样制备两种本发明的胶粘剂基可再封闭紧固件，样品17和18。两种样品胶粘剂与得自市售Nabisco Chips AhoySnack’n Seal
Figure BPA00001635246500191
package采用标准PSA(Fasson 5700，Avery DennisonCorp.，Pasadena，CA)的标准压敏胶粘剂紧固件(PSA对照，样品19)进行比较。
表6：胶粘剂基紧固件制剂
Figure BPA00001635246500192
被涂布的基材包含约77.2％EVA、约10％金属茂LLDPE和约12.8％有机粘土填充剂组合物PolyOne 231-615母料。母料包含约57％-约63％有机改性的粘土和包含MA-LLDPE与聚乙烯的载体。样品17在具有约730mJ/cm2平均光能的UV-固化站固化并且在平均烘箱温度130℉下平均线速度为约100ft/分钟。样品18在具有约700mJ/cm2光能的UV-固化站固化，和在烘箱温度为160℉下线速度为约100ft/分钟。标准胶粘剂、PSA对照，已经以粘附于曲奇饼包装(Kraft Foods)的最终形式提供。
在所有三种包装上实施饼干屑(crumb)玷污实验以观察是否食品颗粒将负面地影响其相应胶粘剂的密封。饼干屑实验方法包括以下步骤：首先，得到Triscuit
Figure BPA00001635246500201
薄脆饼干并采用玻璃缸底部碾碎。薄脆饼干以该方式粉碎产生了将与袋子底部所发现一致的小颗粒。接着，将2英寸直径的环形夹具置于待测样品的胶粘剂上。将约5克饼干屑放置到样品上的环内。将样品与环轻轻地来回摇动以使饼干屑沉淀到可再封闭紧固件的胶粘剂表面上。自样品除去环并将饼干屑轻轻地抖落出样品且丢掉。将环重新放回到基材上的初始位置并且暴露于饼干屑的区域对被保留的饼干屑的量直观地进行评级。采用视觉评定级别0-100，其中0意指没有保留视觉可见的饼干屑，而100意指整个表面用附着的饼干屑覆盖。薄脆饼干屑试验的结果显示于表7中。
另外，在用薄脆饼干屑玷污后测试胶粘剂的剥离强度。剥离强度采用标准试验方法ASTM D3330/D3330M-04方法F进行测量，其中通过自将一面与另一面剥离分开并测量所要求的剥离强度来测试胶粘附着强度。测试初始剥离强度、用薄脆饼干屑初次玷污后的随后剥离强度以及用薄脆饼干屑玷污第二轮后的第二剥离强度，其中样品采用与初次玷污相同的方法玷污。样品的结果呈现在表7中。
表7：饼干屑玷污试验结果
Figure BPA00001635246500202
从这些结果可见，如同按照ASTM试验D3330/D3330M-04方法F测量的PSA对照组的粘附性(即剥离强度)在仅暴露两次薄脆饼干屑之后降低至其初始剥离力值的约5％(即自约500gpli降至约25gpli)。相反，胶粘剂基样品17和18两者在两次暴露薄脆饼干屑之后保持其初始剥离力值的至少约41％，样品18在玷污之后和在反复封闭与打开之后实际上显示剥离力的增加。另外，与PSA对照组的评级值60-80相比较，对胶粘剂基样品的肉眼可见的饼干屑玷污评级为0-10。
也在未玷污的样品17、18和19上实施滚球粘性试验，其为ASTMD3121的修改版本并且按照ASTM D3121的试验方法参数，除非另外指明。所修改的试验测量涂层表面如何强烈粘附于非相似材料例如滚动玻璃球的极性表面。
滚球方法包括：释放被置于在ASTM方法中特别规定的标准斜面上两英寸的玻璃球并使球沿着斜面向下加速和滚过压敏胶粘剂样品的水平表面。所修改的试验版本包括使用玻璃球替代金属球，玻璃球具有约1/8英寸的直径，并采用离开斜面缩短的投放点(即如以上指明的那样，在斜面上两英寸)。通过测量自斜面末端开始，在停止之前球越过胶粘剂行进的距离测定相对粘性。滚球行进距离越长表明与玻璃球极性表面的粘性越低，并且表明与具有表示更高粘性水平的较短滚球行进距离的涂层相比较，所述涂层具有对包装机上辊筒和金属表面粘附的较低趋势。滚球行进距离越长也可与较低的粘附于食物碎屑的趋势相关。在该测量中，测量局限于最大值4英寸，因为对于试验可获得的最大样品大小为4.0英寸×4.0英寸。来自滚球粘性试验的结果显示于表8。
表8：滚球粘性试验结果
  样品   滚球距离(英寸)
  17   ＞4
  18   ＞4
  19(PSA-对照)   1/8
从这些结果可见，两种本发明样品17和18比对照组具有更低的表面粘性，如经玻璃球轻易滚过可再封闭紧固件表面并离开4英寸长的样品所证明。相反，玻璃球在接触PSA对照组表面时几乎立即粘附于PSA对照组，这表明涂层具有高粘性表面。
实施例5
实施剥离重复试验以测试经多次重复的再密封与剥离能力。制备约20个样品；样品20-35采用来自实施例4的样品17的胶粘剂制剂制备，而样品36-38采用来自实施例4的样品18的胶粘剂制剂制备。样品在商业规模试验性涂布生产线上经柔性版涂布工艺技术生产。将液态胶粘剂涂布系统预热至160℉(71℃)并循环通过被安装至雕刻了氧化铬的陶瓷辊的隔室刮刀。雕刻的辊筒(其也被温度控制至160℉(71℃))将液态胶粘剂涂料转印至有图式的橡胶辊筒。有图式的橡胶辊筒依次又将有图式的涂层转印至移动的基材薄膜(即在图6中图解说明的方法)。在激发涂布操作台后，薄膜行进通过60ft长烘箱部分。由3排UV灯组成的UV处理器被置于烘箱出口处。具有被置于烘箱出口端的UV区域的线性构型导致在其中施用材料的涂布操作台与UV-固化操作台之间具有最大的路径长度，这使得对于液态胶粘剂涂层在被固化成为交联聚合物网络之前流出和成水平可得到的时间量达到最大。确信在一些例子中，平滑和水平的涂层表面有助于使要求的胶粘剂达到完全固化胶粘剂中的胶粘剥离力。
实施一系列实验性涂布运转。变化线速度、烘箱温度及UV灯排列数目。实验设计和实验观察结果概述于以下表9中。在试验前测定可见表面粗糙度、MEK抗性和胶粘剂沿着样品的胶粘剂与胶粘剂粘合线的分离。通常，以300ft./分钟-500ft./分钟线速度产生的样品具有粗糙的表面外观和低或没有感官剥离力。这些样品的器械剥离力测量对于大部分是不可能的，因为在能够实施进一步试验之前所连接的各样品自动的分开。以100ft./分钟产生的样品具有平滑的表面外观和中等胶粘剂与胶粘剂剥离力。这些样品采用如在以下表10和11中概述的器械剥离力试验进一步表征。只有不独立分离的如在表9中显示的样品经历反复剥离-再密封试验的测试。这些为样品21、22、29、30、31、32、35、36和38。
表9：用于产生剥离重复试验样品的实验设计
Figure BPA00001635246500231
采用剥离之间的短间隔实施第一组剥离试验，即在剥离-再密封循环之间有约3分钟间隔。表10包括了该试验的结果，其中提供了每种条件下所测试的两个样品的平均值。这些结果与来自实施例4的样品19、PSA对照组进行比较。
表10：3分钟延时剥离-再密封试验结果
Figure BPA00001635246500241
采用剥离之间的更长时间间隔实施第二组剥离实验，即在剥离-再密封循环之间有约24小时间隔，以理解更长的胶粘剂-胶粘剂接触时间的影响，第一次剥离发生在样品被制备之后约1周。对于延长的延时剥离-再密封样品的试验结果显示在表11中。
表11：24小时延时剥离-再密封试验结果
结果显示包含来自实施例4的样品17的胶粘剂制剂的样品不呈现当剥离之间的时间期间为24小时时，伴有反复剥离通常发生的剥离力明显降低(即该实施例中的样品21、22、29、30、31、32和35)。当使胶粘剂样品17在剥离之间保持自身接触约24小时，即使在5次剥离-再密封循环之后，胶粘剂恢复其初始剥离力值的至多约85％。与其它试验样品相比较，样品30具有显著更低的平均剥离力值。即使被连接的样品不主动分离，其由于300ft/分钟的较高线速度而具有不佳的表面平滑度。
另外，令人惊奇地发现，包含来自实施例4的样品18的胶粘剂制剂的样品对于在剥离试验循环之间以短和长时间间隔两者的反复剥离，类似于其在表7中的玷污剥离试验结果，实际上增加剥离力值(即该实施例中的样品36)，证明在再密封后完全恢复剥离力。仅有样品36显示剥离力值增加。样品36为采用较低线速度固化的样品，这可有助于提供水平和平滑的样品表面(参见表9)。以比样品36更高的线速度制备样品38，导致更粗糙的表面，这可能是为什么剥离力值减少以及低的初始剥离力值的原因。
相比之下，PSA对照组仅在剥离之间的间隔长(即24小时)时显示恢复行为。在较短的时间间隔时，对照组实际上剥离力降低约40％。
总体上，对于两种剥离-再密封试验，最佳履行者为样品22、32、35和36。这四种样品全部与用类似加工条件制备的胶粘剂有关。例如，全部四种样品具有100ft/分钟的慢线速度，伴随至少两排或更多排UV灯接通。剥离-再密封试验失败的胶粘剂可能是在UV-固化之前没有足够时间流出和成水平。
实施例6
采用表6中实施例4的胶粘剂样品17和18进行老化研究，以理解更长的胶粘剂-胶粘剂接触时间对剥离性能的影响。经7周时间期间测试胶粘剂的各种性能，包括感观初始剥离力(即低、中、高)、剥离之后的目测外观、与手指的感观粘性或粘连趋势(即无、低、中、高)、涂层耐用性(即MEK耐溶剂试验ASTM D5204)和所有在各种胶粘剂-胶粘剂接触时间下的器械剥离(即采用ASTMD3330/D3330M-04方法F，对相同样品以约3分钟的间隔反复5次连续性剥离；测试两种样品并且一起平均)。在实施例2中采用的相同薄膜基材上涂布胶粘剂。以下表12显示样品17的老化结果。以下表13显示样品18的老化结果。
表12：样品17的老化研究概述
Figure BPA00001635246500261
表13：胶粘剂/胶粘剂接触时间对反复剥离性能的影响(样品18)
Figure BPA00001635246500271
应该注意到平均剥离强度值为对以约3分钟的时间间隔连续剥离的相同样品5次反复剥离的平均值。因此，测量第一次剥离并记录剥离强度值，并且可再封闭重新密封的紧固件样品。在过去3分钟后，可再封闭的紧固件再次被剥开并记录剥离力强度。重复该过程直到进行5次剥离。
对样品17和18两者的感观剥离力、感观粘性和MEK摩擦试验结果均为良好，而不考虑胶粘剂-胶粘剂接触的持续时间。对于样品17，剥离力值(即对相同样品的初始与随后的剥离)在零天至7周范围内保持一致而不考虑胶粘剂-胶粘剂接触的持续时间。样品17显示比样品18更多一致的剥离-再封闭循环。在样品17的初始剥离之后，如通过在随后剥离时剥离力的丧失表示的胶粘剂-胶粘剂粘附强度的丧失通常小于每次随后剥离的约10％，并且是一致的而不考虑胶粘剂-胶粘剂的接触时间。
在第3周开始，样品17和18两者在剥离老化的样品时有明显的变化(即显而易见的变白和不透明度增加)。确信由于手工或器械剥离期间作用于胶粘剂表面的力，该肉眼可见的变化是胶粘剂微观表面变形的证据。表面变形不影响胶粘剂的关键性能特征(即粘性或剥离强度)。结果，样品17保持的稍微更好，无论是其剥离强度随时间的推移的增加，即恢复剥离强度，还是通常在随后的剥离之间保持约10％的剥离损失。
实施例7
来自实施例4的本发明胶粘剂基可再封闭紧固件样品17与具有表14中所指明制剂的本发明3种其它的胶粘剂基可再封闭紧固件样品39至41进行比较。
表14：胶粘剂基紧固件制剂
Figure BPA00001635246500281
组分BR 144被确定为丙烯酸低聚物(BR 144，Bomar Specialties公司，Torrington，CT)。组分CN 2302也被确定为丙烯酸低聚物(CN2302，Sartomer公司)。所有3种样品39至41已掺入丙烯酸低聚物BR 144，样品39和40具有2种丙烯酸低聚物，并且样品41具有3种存在于制剂中的丙烯酸低聚物。
将胶粘剂涂布到在实施例2中使用的相同薄膜基材上。在具有平均线速度约25ft/分钟的UV-固化操作台上固化样品39-41，并且在总计约400mJ/cm2-约600mJ/cm2的UV灯下通过三次。
采用ASTM D3330/D3330M-04方法F，测试4种胶粘剂的涂层耐用性(即MEK耐溶剂试验ASTM D5204)以及初始剥离强度。也进行滚球粘性试验，其为如在实施例4中描述的ASTM D3121的修正版本，除了可用于试验的样品体积大小为约2.5英寸宽乘以约7英寸长。这些结果表示在表15中。
表15：采用表14制剂的固化和胶粘试验结果
Figure BPA00001635246500291
与仅具有1种丙烯酸低聚物组分的样品17相比较，初始剥离强度即实验室条件下的初始剥离性能对于新制剂增加约30％-300％。与样品17相比较，滚球粘性距离对于新制剂增加大于300％。
从这些结果可见，具有两种或更多种丙烯酸低聚物的新制剂与样品17相比较性能全面改善，如经滚球试验和剥离强度试验证明的那样。经MEK摩擦试验证明，所有样品具有优良的固化速率。具体地讲，所有的新样品制剂即样品39-41具有比样品17更低的表面粘性，并且尤其是，如通过玻璃球易于滚动越过可再封闭紧固件的表面并离开7英寸长的样品证明的那样，样品40和41具有甚至更好的低表面粘性。
实施例8
对实施例7的4种本发明胶粘剂基可再封闭紧固件测试各种反复剥离试验。首先剥开并打开样品，采用ASTM试验方法D3330/D3330M-04方法F测量以克/线性英寸(gpli)表示的剥离力，然后再密封3分钟，并且重复剥离。每3分钟重复这一密封-再密封直到获得10个数据点。结果呈现在以下表16中。
表16：3分钟剥离延时试验
实施例9
采用来自实施例7的相同的4种本发明样品实施24小时延时重复试验。首先剥开并打开样品，测量所要求的剥离力。然后再密封样品并使之在控制的环境(即72℉和50％相对湿度(RH))下放置24小时，直到它们被重新剥离和再次打开。重复这一过程直至总计5个数据点被采集，或者5天的时间期间。结果呈现于以下表17中。
表17：24小时剥离延时试验
Figure BPA00001635246500302
在整个5天实验期间使所有四种样品保持其剥离性能，在试验天数内任何一天没有任何样品低于400gpli。样品39和41实际上增加剥离力并且恢复初始剥离力或增加试验期间的剥离力。因此，使这些样品保持密封至少24小时的时间，使这些样品恢复或者增加胶粘性。
实施例10
在实施例10中，采用在实施例7中描述的四种样品进行与实施例9类似的试验；然而，在每一剥开后，使胶粘剂区域与全部咖啡豆接触，再密封并使之保持封闭24小时，并重新剥离。
在每一次剥开后，全部咖啡豆被放置在胶粘剂表面并且在少于5分钟内被除去。再密封样品并使之在控制环境(即72℉和50％RH)内放置24小时，直至它们被重新剥离和再次打开。重复这一过程直至总计5个数据点已经被采集，或者5天的时间。结果呈现在以下表18中。
表18：咖啡豆玷污后24小时剥离延时试验
Figure BPA00001635246500311
尽管数据显示剥离强度稍有减少，用全部咖啡豆五次剥离/玷污循环后剥离值仍然超过200gpli。
实施例11
在不含胶粘剂的薄膜上进行如在实施例4中描述的滚球粘性试验，用于与低粘性胶粘剂的粘性值相比较。结果提供在以下表18中。来自样品1的3号滚球(roll)在接触薄膜后不久变得相当锋利。
表18：未涂布薄膜上的滚球粘性试验
  样品   1   2
  1号滚球   16.75   15.875
  2号滚球   18   18
  3号滚球   10.875   14.25
  4号滚球   17.25   18.125
  5号滚球   20.25   19.875
  6号滚球   15
  平均值   16.35   17.23
应理解在如所附权利要求中表达的实体方法的原理和范围内，本领域技术人员可进行包装及其制剂工艺方法的细节、材料和排列的各种变化，它们在此已经被描述和阐述以说明所描述的包装的性质。

Claims (10)

1.一种用于物品的可再封闭包装，所述包装包含：
多个壁，所述壁密封以形成用于接受物品的内部空腔，所述空腔被底壁片段和初始密封的上部开口界定，开口的密封能被可剥离地打开以允许初始接近内部空腔中的物品，所述多个壁包括一对各自具有顶边和底边部分、宽度、高度和朝内表面的相对壁片段；和
低粘性胶粘剂区域，其跨过每一个相对壁片段的整个宽度，在每一个相对壁片段的内表面上配置，并且沿着相对壁片段的至少大多数高度从相邻的开口朝向底壁片段延伸，胶粘剂区域对彼此比对物品的粘附具有更大的亲和力，并允许包装在初始打开上部开口之后，在相对壁片段的多个不同的高度，使用胶粘剂区域再封闭，以渐进降低空腔的尺寸，使得当将物品从包装序贯除去时，在物品之上在再封闭包装中的顶部空间最小化。
2.权利要求1的可再封闭包装，所述包装还包含至少一个横跨包装的圆周延伸的易毁坏区域，其设置以允许与上部开口相邻的一部分包装被除去，从而在多个不同的高度的至少一个之上减少外部包装材料。
3.权利要求1或2的可再封闭包装，其中所述包装还包含具有朝内表面的相对侧壁片段，并且其中低粘性胶粘剂区域在每一个相对侧壁片段的内表面上配置。
4.一种用于物品的可再封闭包装，所述包装包含：
至少两个具有朝内表面的壁，将所述至少两个壁密封以形成具有圆周的管状包装，将所述管状包装在其顶边和底边部分上初始密封以形成用于储存物品的内部空腔；
低粘性胶粘剂，其在顶边和底边部分的中间，在至少两个壁的朝内表面的排列对齐的部分上，以横跨管状包装圆周的方式配置；和
其中低粘性胶粘剂对自身比对物品的粘附具有更大的亲和力，以在物品通过在朝内表面上的低粘性胶粘剂的压力序贯减少之后，有效允许包装与物品相邻再封闭在一起。
5.权利要求4的可再封闭包装，其中所述低粘性胶粘剂在大多数朝内表面上配置。
6.权利要求4或5的可再封闭包装，其中低粘性胶粘剂的样式包括多个带，这些带沿着至少两个壁的高度间隔，并且通常沿着包装的圆周横向配置到包装的纵轴。
7.权利要求4-6中任一项的可再封闭包装，所述包装还包含至少一个横跨包装的圆周延伸的易毁坏区域，其设置以允许与物品相邻的一部分包装被除去，从而在包装的再封闭的部分之上减少外部包装材料。
8.权利要求6或7的可再封闭包装，所述包装还包含多个通常沿着包装的圆周横向延伸到包装的纵轴的易毁坏区域，并且在多个低粘性粘合带之上和与之相邻配置。
9.一种再封闭用于物品的包装的方法，所述方法包括：
在其可剥离地打开的密封处打开包装；
从包装序贯除去物品，从而在包装中产生顶部空间；
使用在相对内表面上配置的低粘性胶粘剂再封闭与物品相邻的一部分包装，从而减少在包装中的顶部空间。
10.权利要求9的方法，所述方法还包括通过分离易毁坏区域，除去一部分与粘附的相对内表面相邻的包装，所述易毁坏区域围绕与包装的再封闭部分相邻的包装沿圆周延伸。
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