CN115916653A - 分配衬里 - Google Patents

分配衬里 Download PDF

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Publication number
CN115916653A
CN115916653A CN202180038479.6A CN202180038479A CN115916653A CN 115916653 A CN115916653 A CN 115916653A CN 202180038479 A CN202180038479 A CN 202180038479A CN 115916653 A CN115916653 A CN 115916653A
Authority
CN
China
Prior art keywords
container
layer
lower portion
liner system
dispensing liner
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.)
Pending
Application number
CN202180038479.6A
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English (en)
Inventor
R·W·托斯滕森-沃尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Selig Sealing Products Inc
Original Assignee
Selig Sealing Products Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Selig Sealing Products Inc filed Critical Selig Sealing Products Inc
Publication of CN115916653A publication Critical patent/CN115916653A/zh
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65D77/00Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10Container closures formed after filling
    • B65D77/20Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028Means for opening the cover other than, or in addition to, a pull tab
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    • B65D77/2048Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut
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    • B65D77/206Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure whereby part of the container or cover has been weakened, e.g. perforated or precut the cover being weakened so as to uncover one or more preformed openings made through some layers of the cover
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Abstract

本文提供了用于密封和分配容器内容物的各种系统。这些系统可包括可在密封位置和分配位置之间相对于彼此移动的开口。

Description

分配衬里
相关申请的交叉引用
本申请要求2020年5月29日提交的美国临时申请号63/031,818的权益,其全部内容通过引用并入本文。
技术领域
本申请涉及用于容器的密封件,并且更具体地涉及用于容器的密封件,由此容器的内容物可以通过密封件的一部分分配。
背景技术
经常需要使用可移除或可剥离的衬里系统、密封件、密封构件或内部密封件来密封容器的开口。然后经常将盖子或其他封闭物拧紧或放置在容器开口上,将密封件固定在其中。在使用中,消费者通常取下盖子或其他封闭物以接近密封件,然后从容器上取下或以其他方式剥离密封件以便分配或接近其内容物。
在一些形式中,容器容纳液体、粉末等,由此容器的内容物可以以测量的方式被分配。例如,可以通过将注射器插入容器来分配液体药物。在其他形式中,可以将内容物从容器倒入测量装置中。在这些方面,常常希望容纳内容物,而且希望具有小的或以其他方式可控的开口以用于更准确的分配。
类似地,有时希望使分配器或筛子设置为以可控方式分配较小的颗粒。例如,香料常常从具有许多开口的筛子型结构中分配,以分散和分布容器中的内容物。
在现有系统中,密封件位于刚性筛结构下方。密封件被构造为密封容器中的内容物,必须将其移除才能接触到内容物。然而,为了移除密封件,使用者首先需要移除刚性筛结构,移除密封件,然后将刚性筛结构更换到容器上。这个多步骤过程对于某些使用者来说可能是复杂的,并且还增加了使用者无法重新-安装刚性筛结构以供使用的机会。
其他分配器或筛子通常必须构造为使它们与密封件上的其他部件对齐。例如,具有一个或多个开口的密封件或分配器将必须被构造成使得开口不定位在密封件和容器的台肩区域附近。如果开口位于台肩区域附近,则密封件可能会受到损害并且不会完全粘附到容器。此外,开口通常还必须相对于一个或多个拉片或其他结构定位,以保持密封完整性。
由于要求对密封件的各个部件进行对齐,整个密封件的构造和组装变得更加困难、耗时且昂贵。对齐要求将密封件的各个层定位在精确的位置和/或以非常精确的方式切割。除了耗时和昂贵之外,这也可能特别困难并导致浪费。
发明内容
在此提供具有分配功能的密封件的各种增强。在各种实施例中显示和描述的以下特征可以单独使用或彼此组合使用。例如,一个实施例的一个或多个特征可以用在另一实施例中,使得这些特征可以是可互换的。
在一种形式中,提供了用于容器的分配衬里。衬里可包括具有支撑层和补偿密封层的上部和下部。下部限定至少一个开口,由此容器的内容物可通过其分配。下部包括用于密封到容器的密封剂层。上部可移除地粘附到下部并且补偿密封层在安装在容器上时延伸穿过至少一个开口以帮助将分配衬里密封到容器。
还提供了一种用于形成用在容器上的分配衬里的方法。该方法包括以下步骤:提供具有支撑层和补偿密封层的上部;提供限定至少一个开口的下部,由此容器的内容物可以通过该开口分配,下部包括用于密封到容器的密封剂层;并且将上部和下部可拆卸地固定到彼此,上部可由使用者从下部拆卸,当安装在容器上时补偿密封层延伸穿过至少一个开口以帮助将分配衬里密封到容器。
根据一种形式,该系统还包括以随机图案提供的下部中的多个开口,使得开口不与下部的边缘对齐。
根据一种形式,补偿密封层包括乙烯醋酸乙烯酯、乙烯丙烯酸、聚乙烯和乙烯醋酸乙烯酯的共聚物、各种蜡混合物、增粘挤出涂层及其组合中的至少一种。
在一种形式中,补偿密封层具有约1.0至约3.0密耳(mil)的厚度。
根据一种形式,下部还包括释放层。
根据一种形式,下部包括微空化聚乙烯或微孔聚对苯二甲酸乙二醇酯(PET),以帮助提供上部和下部之间的释放。
在一种形式中,密封层具有约0.5至约2.5密耳的厚度。
根据一种形式,下部包括聚合物泡沫层。
根据一种形式,聚合物泡沫是聚对苯二甲酸乙二醇酯背衬的聚烯烃泡沫,包括层压到约2.5至约4.0密耳泡沫的约0.5PET。
在一种形式中,衬里系统还包括箔感应层。
根据一种形式,衬里系统包括多个开口并且每个开口具有约1mm至约5mm的直径。然而,尺寸可以根据需要变化。
根据一种形式,多个开口的面积与整个衬里系统表面积的比率可以根据所选材料、强度等而变化。
在一种形式中,上部部分地结合到下部以限定拉片。
根据一种形式,衬里系统还包括至少一个向外延伸的侧拉片。
根据一种形式,下部具有约1密耳至约8密耳的厚度。
在一种形式中,下部的密度也可以变化。
附图的简要说明
图1是分配衬里系统的一种形式的分解图;
图2是分配衬里系统的另一种形式的分解图;
图3是分配衬里系统下部的透视图;
图4是安装在盖子中的衬里系统的底视图;
图5是开始移除时具有外部拉片的衬里系统的上部的俯视图;
图6是图5的衬里系统当上部正从下部移除时的俯视透视图;
图7是图5的系统当上部被移除时的俯视图;
图8是衬里系统下部的俯视图,其中开口位于外部,在容器的台肩区域上方;和
图9是衬里系统的局部剖视图,其中开口位于容器的台肩区域上方。
具体实施方式
为了便于理解寻求保护的主题,在附图中示出了其实施例,通过查看附图,当结合以下描述考虑时,寻求保护的主题、其构造和操作、以及它的许多优点应该很容易理解和领会。
应当理解,各种术语可用于密封构件,例如衬里、衬里系统、密封件等。一般来说,此类结构包括多层部件,这些部件被构造为暂时和/或永久地将结构的至少一部分粘附到容器上。
为简单起见,本公开一般可指容器或瓶子,但本文的密封构件可应用于任何类型的容器、瓶子、包装或具有围绕通向内腔的入口的边缘或口部的其他装置。在本公开中,提及密封构件的各部件的上表面和下表面和上层和下层是指如图中大体描绘的并且当密封构件与处于直立位置且具有在容器顶部的开口的容器一起使用时各部件的定向。将首先一般性地描述密封构件的不同方法,然后将在其后解释各种结构和材料的更多细节。应当理解,在一些情况下,本文描述的密封构件以一件式或两件式密封构件构造起作用。一体式密封构件通常只包括结合到容器边缘的密封构件。盖子或封闭物也可与其一起使用。两件式密封构件包括临时结合到衬里的密封构件。在这种构造中,密封构件结合到容器的边缘,并且衬里被构造为在加热期间与密封构件分离以保持在容器上使用的盖子或其他封闭物中。在两件式构造中,例如可以使用蜡层将密封构件临时结合到衬里。其他类型的可释放层也可用于提供密封件和衬里之间的临时结合,但可释放层一般是热激活的。
参考图1,示出了系统20的第一种形式。系统20通常包括上部22和下部24。上部22包括支撑层26和补偿层28。在一种形式中,上部22还可以包括膜层30。膜层30可以是感应加热层,例如金属箔,也可以提供防潮性能、隔氧性能等。虽然显示在上部22中,但膜层28可被包括在下部24中或不包括在任一层中。
下部24包括用于密封到容器的密封剂层32。下部24还可包括允许上部22可由使用者从下部24移除的释放层34。在一种形式中,下部24还可以包括聚合物层36。聚合物层36可以采用多种不同的形式,例如泡沫、薄膜等。此外,聚合物层36可提供多种不同的功能,例如提供结构支撑、绝缘性能等。应当理解,下部24还可以包括多种形式的上述层以及附加层。
下部24还包括至少一个开口38。如图1所示,下部24包括多个开口38。在一种形式中,开口38构造成延伸穿过整个下部24并穿过其中的每一层。
一般来说,补偿层28被构造成使得它将流过至少一些开口以帮助将系统20密封到容器。更具体地,在容器上的系统20的密封过程期间,补偿层28可以流过定位在容器的台肩区域上方的至少开口。例如,系统可以在感应密封过程中粘附到容器上。膜层30在感应加热过程中提供热量,使得热量可以使密封剂层32密封到容器并且还使补偿层28的至少一部分流过开口并且也密封到容器。
应该理解的是,图1中所示的系统20不包括顶部拉片或向外延伸的拉片。在这种形式中,使用者会使用他们的指甲或其他小工具开始将上部22从下部24剥离。在其他形式中,系统可以包括从系统20的整个圆周延伸的拉片以形成抓握拉片,用于移除上部22。
在另一种形式中,例如图2所示,上部22包括顶部拉片40以帮助使用者从下部24移除上部。顶部拉片40包括在上部22中的任意数量的层。在一种形式中,例如图2所示,顶部拉片包括支撑层26,由此支撑层26部分地粘附到上部的其他层。然而,也可以使用其他层来帮助形成顶部拉片40。此外,可以包括释放层42以帮助释放顶部拉片40并确保其容易被使用者可抓握。
下部24的未切割层压件44示于图3中。在这种形式中,可以看出开口38完全延伸穿过下部24的厚度。虽然显示为规则图案,但是开口可以采用规则或不规则图案。此外,开口的尺寸可以根据需要变化,并且还可以包括不规则形状的开口。开口还可以包括单个密封件或系统中的各种尺寸。取决于容器开口的尺寸和容器的内容物,开口可以具有多种尺寸,例如约1mm和更大。在一种形式中,开口可以与下部的总表面积成一比例。开口相对于台肩区域或边缘的位置和尺寸也可以被修改。例如,当存在较大台肩区域时,可以增加开口的尺寸。
此外,可以看出下部24可以包括印刷,以帮助提供篡改指示以及关于封条来源和/或容器内容物的信息以致防止伪造。
上面提到的层的一些细节将在下面讨论。由于下部24包括开口38,该开口38可能位于或可能不位于需要密封的区域,因此上部22包括补偿密封层28。补偿密封层被构造为流入开口38,特别是朝向系统20的外围边缘定位的开口。在这方面,补偿层28用作辅助密封剂层32的辅助密封层。由于存在可以朝向外围边缘定位的开口38,系统通常会在此处密封到容器的台肩区域,因此补偿层28构造成延伸穿过下部24以抵靠容器密封。由于补偿层28和密封剂32,密封系统能够为容器提供期望的密封。此外,由于以这种方式构造补偿层,开口不需要定位在特定区域中并且不需要制造或安装整体密封件使得任何部件需要对准。
补偿密封层28可以包括多种材料并且可以基于相邻层以及用于安装系统的条件来构造。例如,补偿层28可以包括多种不同聚合物组合物中的一种或多种。补偿层可包括聚乙烯和乙烯醋酸乙烯酯的共聚物、乙烯丙烯酸、各种蜡混合物、增粘挤出涂层及其组合中的一种或多种。
在一种形式中,补偿层可具有约75至约102℃的熔点。此外,根据开口的尺寸,补偿层可以多种不同的厚度提供。例如,在一种形式中,补偿层可具有约1密耳至约8密耳的厚度,以便提供足够的材料流入开口中。在一种形式中,补偿层在期望温度下具有流动性。在一种形式中,该材料可具有约70至约115℃的软化点。
如上所述,补偿层可以被构造为至少在邻近台肩区域具有开口的区域中为容器提供密封功能。就此而言,补偿层可构造为提供约1000至约2500g/in的结合强度。例如,当容器是PET时,补偿层可以由具有热封涂层的PET层压材料或膜组成,例如Mylar CL的杜邦Mylar OL,或EVA热熔蜡。粘合强度不应太强,以免导致密封件的多个部分无法从容器上松开。在另一种形式中,补偿层可以形成更多的焊接密封,使得如果开口很小和/或间隔开,延伸到容器边缘的补偿层可以保留,然后补偿层的其他部分可以破裂以将密封件从容器释放。
膜层30可以被构造成提供热量,例如在感应加热过程中,以及提供各种阻隔特性。如图所示,在一种形式中,膜层30可以设置在上部22中。在其他形式中,膜层30可以设置在下部24中。在其他形式中,多个膜层可以设置在上部和下部22、24的一个或多个中。
可以根据需要修改膜层的材料和特性以提供期望的特性。例如,膜层可以根据系统中其他层的厚度和材料类型进行修改。例如,在一种形式中,膜层可以是厚度可在约0.00035"至 0.002"之间的铝箔。
更具体地,膜层可以是构造成向密封件提供感应加热和/或阻隔特性的一层或多层。构造成提供感应加热的层是能够在暴露于感应电流时产生热量的任何层,其中在该层中的涡电流产生热量。通过一种方法,膜层可以是金属层,例如铝箔、锡等。在其他方法中,膜层可以是与感应加热层组合的聚合物层。膜层也可以是或包括能够至少阻止气体和水分从密封容器外部向内部迁移的大气阻挡层,并且在一些情况下,还同时提供感应加热。因此,膜层可以是构造为提供此类功能的一层或多层。
支撑层26可执行多种功能,例如为上部提供支撑、抗撕裂、绝缘等。支撑层也可以被认为是用于上部中的一层或多层的背衬层。支撑层26可由多种材料形成,例如聚合物、纸、纸板等。
在一种形式中,支撑层26可以是聚对苯二甲酸乙二醇酯(PET)、尼龙或其他结构聚合物层,并且在一些方法中可以是约0.5至约1密耳厚。也可以使用其他材料,例如纸和PET。此外,多个层的层压件,例如PET/粘合剂/泡沫的层压件,可以用于绝缘,因为该层与封闭物的内部接触。这可有助于防止熔化和粘在封闭物上。可以使用诸如尼龙之类的其他材料。
释放层34通常位于下部中。然而,在其他形式中,释放层34可以定位在上部的下表面上以提供从下部和上部之一的释放。一般来说,释放层被构造成使得当上部被使用者拉动时上部和下部彼此分离。释放层必须适合于在制造、安装到盖子中以及最终密封到容器上的过程中保持上部和下部彼此联接。在使用者去除盖子后,释放层将断裂、释放或以其他方式允许上部和下部彼此分离。
释放层可以由多种不同的材料形成。这样的材料包括但不限于PTFE、PET等。释放层可以多种厚度提供,这取决于释放层是否需要为下部或上部提供支撑。还可以制备释放层的表面以使其具有增强的释放特性。例如,表面可包括微穿孔或纹理以减少至少一侧的表面接触。释放层也可以涂有材料,例如硅酮、硝化纤维素释放涂层、含有释放促进成分例如滑石粉或二氧化硅、或滑爽添加剂例如芥酸酰胺、或防粘连添加剂例如禾大芥酸酰胺(crodamide)的漆。也可以使用其他材料,例如配制成包含上述类似释放促进剂的聚合物基质。
在一些形式中,下部可仅包括释放层,其既用作释放层又用作支撑层并且可能用作密封剂层,否则可能由聚合物层36提供。例如,可使用微空化聚酯,其由于薄膜的不同表面特性,提升了上部的释放特性。这种材料可能特别适合于密封PET容器。对其他聚合物容器的密封将通过密封层的改型来实现。例如,聚乙烯容器可以用合适的聚乙烯密封层焊接密封或用EVA的改性共聚物可剥离。
一种特定类型的材料可包括微空化PET0.5密耳,例如用于下部的Melinex 891。这种材料也可以作为更厚的规格92 GA或142 GA运行。如果使用更厚的规格,层压0.5密耳-0.5密耳标准包装等级的PET(例如杜邦800C)可能是可行的。
聚合物层36可以是聚合物膜和/或聚合物泡沫。在一些形式中,为了支持结构完整性,额外的聚合物层可以被包括在该结构中。在一种形式中,一层聚合聚烯烃泡沫被层压在释放层和密封剂层之间。虽然这会对向密封剂部件的热传递产生负面影响,但这可以通过应用受控感应参数来平衡。
在一种形式中,下层压件可以包括PET背衬的聚烯烃泡沫,例如约0.5PET层压到约2.5至约4.0密耳聚乙烯泡沫。这可以提供多种功能,例如结构支撑、绝缘,并且在某些情况下还具有释放特性。
密封剂层32可以是用于密封到容器的任何合适的材料。密封剂的成分可以根据容器的类型、在下部中使用的材料的类型以及安装条件进行修改。在一种形式中,密封剂层通常可包括0.5密耳至2.5密耳的接触容器的厚度,该容器被层压到或并入挤出涂层的或层压的膜中。
下部密封剂或热封层可由适合结合到容器边缘的任何材料组成,例如但不限于感应、传导或直接结合方法。用于可热封层的合适的粘合剂、热熔粘合剂或密封剂包括但不限于聚酯、聚烯烃、乙烯醋酸乙烯酯、乙烯-丙烯酸共聚物、沙林树脂(surlyn)和其他合适的材料。通过一种方法,可热封层可以是约0.2至约3密耳厚的此类材料的单层或多层结构。通过一些方法,选择热封层以具有与容器的成分相似的成分和/或包括与容器的成分相同的聚合物类型。例如,如果容器包含聚乙烯,则热封层也将包含聚乙烯。如果容器包含聚丙烯,则热封层也将包含聚丙烯。其他类似的材料组合也是可能的。
在一种形式中,上部向下部提供压缩。这可有助于在密封剂层和容器之间保持适当的密封。此外,通过提供压缩,补偿层可以更好地被引导到开口中。
在密封件中使用的各层的厚度和密度可以根据需要变化。此外,可以改变下部和上部的相对厚度和密度。
在某些形式中,传热可能是重要的,并且要求在存在高温的情况下保持结构完整性。例如,必须将足够的热量传递到密封剂层以及补偿层以流过开口。但是,热量不能对系统中的其他层产生不利影响。
在这方面,下部的厚度和密度可能是重要的,因为它必须抵抗由感应产生的热量而不会使衬里退化或变形。在某些形式中,可能还期望保持为可剥离和可刺穿的。在一些形式中,下部可以构成为密封到特定的聚合物或密封到诸如由包装领域可获得和理解的许多密封剂定义的范围。
如上所述,各种类型的材料可用于本文所述的结构中。例如,聚乙烯/EVA多层共挤吹膜。可以使用挤出涂层的PET和PE容器。此外,单层吹塑PE膜可用于形成更多的焊接密封。
如上所述,可以组合使用范围广泛的具有可变厚度和结构组成的聚合物。可以调节诸如金属箔的膜、聚合物的密度和感应应用的持续时间以提供期望的密封性能。热量从膜(主要感应部件)传递到筛子部件(下部),以影响筛子在热应力下的结构稳定性。结构和聚合物的选择将控制结构完整性和对应用性能的好处。
补偿层可被构造成使其在感应加热条件下可适当地流动。一般来说,需要补偿层来保持密封完整性。补偿层材料必须能够流动并密封到要求密封性的容器台肩或其他接触表面或器皿。
图4示出了安装在多个盖子50中的系统的一种形式。由于开口没有定位成与密封件52的边缘对齐,所以当盖子安装在容器上时,任何数量的开口都可以位于靠近台肩区域。例如,开口54被定位成使得开口54将接触台肩区域。
图5示出了当安装在容器60上时当它开始与下部24分离时上部22的一种形式。图6示出了当它继续与下部24分离的上部22。下部24保留在容器60上。图7示出了上部22从下部24完全去除。此外,可以看出,补偿层28与上层22一起从内开口38去除。补偿层28没有从定位在容器的台肩区域上方的开口38完全去除,使得补偿层的至少一部分与下部24保持在一起。
图8示出了具有多种开口38的下部24的一种形式。包括在开口中的开口68定位成朝向下部的外围边缘并且在安装时将定位成邻近容器的台肩区域。
图9是在下部24与上部22结合并安装在容器60上之后沿图8的线A-A截取的局部剖视图。如图9所示,补偿层28的一部分已经流入下部层压件的开口68以接触容器60。这可以帮助保持在容器上的适当密封,即使开口位于邻近台肩区域。
除了以上描述的特征之外,下部和上部可以包括多种不同的材料和层。例如,下密封部可以包括金属箔,并且下密封部的顶表面可以是金属箔。下密封部还可以包括发泡聚合物,或者下密封部的顶表面可以是选自聚烯烃材料和聚酯材料的聚合物膜。
附加层可以被包括在上部和/或下部中,例如聚对苯二甲酸乙二醇酯(PET)、尼龙或其他结构聚合物层,并且在一些方法中可以是约0.5至约1密耳厚。在一些方法中,附加层可以被包括在下部和/或上部中。应当理解,下密封部分可以包括任何数量的其他层,例如聚合物层、粘合剂、聚合物膜、聚合物泡沫等。
在上部和/或下部中使用的聚合物层可以采用多种形式,例如涂层、薄膜、泡沫等。合适的聚合物包括但不限于聚乙烯、聚丙烯、乙烯-丙烯共聚物、它们的共混物以及具有高碳α-烯烃的共聚物或共混物。通过一种方法,一个或多个聚合物层可以是聚烯烃材料的混合物,例如一种或多种高密度聚烯烃组分与一种或多种低密度聚烯烃组分的混合物。在一种形式中,一个聚合物层可以是聚乙烯膜而另一个聚合物层可以是PET膜。根据一种形式,聚乙烯膜可具有约5至约20微米的厚度,而PET膜可具有约5至约20微米的厚度。
支撑层在上部和/或下部中可以是可选的。如果包含的话,它可以是聚对苯二甲酸乙二醇酯(PET)、尼龙或其他结构聚合物层,并且在一些方法中可以是约0.5至约1密耳厚。
在一些形式中,系统可以包括绝缘层或热再分布层。在一种形式中,绝缘层可以是泡沫聚合物层。合适的发泡聚合物包括发泡聚烯烃、发泡聚丙烯、发泡聚乙烯和聚酯泡沫。在一些形式中,这些泡沫通常具有约2000至约3500g/in的内部破裂强度。在一些方法中,发泡聚合物层106还可以具有小于0.6g/cc的密度,并且在一些情况下,约0.4至小于约0.6g/cc。在其他方法中,密度可以是从大约0.4g/cc到大约0.9g/cc。发泡聚合物层可为约1至约5密耳厚。
在其他方法中,可以包括非泡沫热分布或热再分布层。在这种方法中,非泡沫热分布膜层是聚烯烃材料的混合物,例如一种或多种高密度聚烯烃组分与一种或多种低密度聚烯烃组分的混合物。合适的聚合物包括但不限于聚乙烯、聚丙烯、乙烯-丙烯共聚物、它们的共混物以及具有高碳α-烯烃的共聚物或共混物。通过一种方法,非泡沫热分布聚烯烃膜层是约50%至约70%的一种或多种高密度聚烯烃材料与其余部分是一种或多种较低密度聚烯烃材料的共混物。选择混合物以实现有效密度以提供对容器的热密封以及将衬里与密封件一体分离。
热激活粘合层可包括任何聚合物材料,这些材料被热激活或加热以实现其粘合特性或应用于密封件。通过一种方法,热激活粘合层可具有约0.9至约1.0g/cc的密度和约145℉到大约155℉的峰值熔点。粘合层120的熔体指数可为约20至约30g/10min。 (ASTMD1238)。合适的例子包括乙烯醋酸乙烯酯(EVA)、聚烯烃、双组分聚氨酯、乙烯丙烯酸共聚物、可固化的两部分聚氨酯粘合剂、环氧树脂粘合剂、乙烯甲基丙烯酸酯共聚物等粘合材料。
可用于本文所述的任何粘合剂层或连接层的粘合剂包括,例如,乙烯醋酸乙烯酯(EVA)、聚烯烃、双组分聚氨酯、乙烯丙烯酸共聚物、可固化双组分聚氨酯粘合剂、环氧树脂粘合剂、乙烯甲基丙烯酸酯共聚物等粘接材料。其他合适的材料可以包括低密度聚乙烯、乙烯-丙烯酸共聚物和乙烯甲基丙烯酸酯共聚物。通过一种方法,任何可选的粘合剂层可以是涂覆的聚烯烃粘合剂层。如果需要,此类粘合剂层可以是约0.2至约0.5密耳(或更少)粘合剂的涂层,例如带涂层的乙烯醋酸乙烯酯(EVA)、聚烯烃、双组分聚氨酯、乙烯丙烯酸共聚物、可固化双组分聚氨酯粘合剂、环氧树脂粘合剂、乙烯甲基丙烯酸酯共聚物等粘接材料。
在一个方面,拉片可由全层或部分材料层与局部宽度复合粘合剂结构结合而形成,该局部宽度复合粘合剂结构包括聚酯芯,在其相对侧具有上粘合剂和下粘合剂。这种局部复合粘合剂结构结合多个层的多个部分以形成抓握拉片。
密封构件的各个层通过涂敷粘合剂、施加薄膜和/或形成所述层的片材的热层压工艺而组装。也可以使用挤出层压。所得到的密封构件的层压片可以根据需要被切割成适当尺寸的盘或其他形状以形成容器封闭组件或密封构件。将切割的密封构件插入盖子或其他封闭物中,进而盖子或其他封闭物被应用到待密封的容器的颈部。螺旋盖可以拧到容器的开口颈部上,从而将密封构件夹在容器的开口颈部和盖子的顶部之间。密封层可以是压敏粘合剂,将封闭物附接到容器的力可以激活粘合剂。密封层也可以是例如通过感应加热、传导加热等热激活的粘合剂。
本文所述的密封件和系统可以以多种不同的方式形成。在一种形式中,上部和下部可以各自单独形成,然后被连接在一起。在另一种形式中,上部和下部中的一个或多个的一部分可用于将上部和下部连接在一起。
应当理解,本领域技术人员可以在如所附权利要求中表达的原则和范围内对本文已描述和说明的部件和组件的细节、材料和布置进行各种改变,以便说明方法和组合物的本质。

Claims (16)

1. 一种用于容器的分配衬里系统,该系统包括:
具有支撑层和补偿密封层的上部;和
限定至少一个开口的下部,由此容器的内容物能通过该开口分配,所述下部包括用于密封容器的密封剂层,所述上部可移除地粘附到所述下部,当被安装在容器上时所述补偿密封层延伸穿过至少一个开口,以帮助将分配衬里密封到容器。
2.如权利要求1所述的分配衬里系统,还包括在所述下部中以随机图案设置的多个开口,使得所述开口不与下部的边缘对齐。
3.根据权利要求1所述的分配衬里系统,其中所述补偿密封层包含乙烯醋酸乙烯酯、乙烯丙烯酸、聚乙烯和乙烯醋酸乙烯酯的共聚物、蜡混合物、增粘挤出涂层及其组合中的至少一种。
4.根据权利要求1所述的分配衬里系统,其中所述补偿密封层具有约1.0至约3.0密耳的厚度。
5.如权利要求1所述的分配衬里系统,其特征在于,所述下部还包括释放层。
6.根据权利要求1所述的分配衬里系统,其中所述下部包括微空化聚乙烯以帮助提供上部和下部之间的释放。
7.根据权利要求1所述的分配衬里系统,其中所述密封层具有约0.5至约2.5密耳的厚度。
8.如权利要求1所述的分配衬里系统,其中所述下部包括聚合物泡沫层。
9.根据权利要求8所述的分配衬里系统,其中所述聚合物泡沫是聚对苯二甲酸乙二醇酯背衬的聚烯烃泡沫,包括约0.5PET层压到约2.5至约4.0密耳泡沫。
10.如权利要求1所述的分配衬里系统,还包括箔感应层。
11.根据权利要求1所述的分配衬里系统,包括多个开口并且每个开口具有约1至约5mm的直径。
12.根据权利要求1所述的分配衬里系统,其中所述下部具有约1至约8密耳的厚度。
13.如权利要求1所述的分配衬里系统,其中,所述上部部分地结合到所述下部以限定拉片。
14.如权利要求1所述的分配衬里系统,还包括至少一个向外延伸的侧拉片。
15. 一种用于形成用于在容器上使用的分配衬里系统的层压件,该层压件包括:
具有支撑层和补偿密封层的上部;和
限定至少一个开口的下部,由此容器的内容物能通过该开口分配,所述下部包括用于密封到容器的密封剂层,所述上部可移除地粘附到所述下部,当形成作为分配衬里系统并安装在容器上时补偿密封层延伸穿过至少一个开口,以有助于将分配衬里密封到容器。
16.一种形成用于在容器上使用的分配衬里系统的方法,该方法包括:
提供具有支撑层和补偿密封层的上部;
提供限定至少一个开口的下部,由此容器的内容物能通过该开口分配,所述下部包括用于密封到容器的密封剂层;和
将上部和下部可拆卸地固定到彼此,所述上部是由使用者从下部可拆卸的,所述补偿密封层在安装在容器上时延伸穿过至少一个开口以帮助将分配衬里密封到容器。
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