CN103003065A - 含有除氧剂的层压和热成型的物品 - Google Patents

含有除氧剂的层压和热成型的物品 Download PDF

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CN103003065A
CN103003065A CN2011800249358A CN201180024935A CN103003065A CN 103003065 A CN103003065 A CN 103003065A CN 2011800249358 A CN2011800249358 A CN 2011800249358A CN 201180024935 A CN201180024935 A CN 201180024935A CN 103003065 A CN103003065 A CN 103003065A
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film
container
iron
oxygen
bag
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C-C·仇
S·A·因科维亚
T·H·鲍威尔斯
S·E·索洛夫约夫
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Multisorb Technologies Inc
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Abstract

在聚合物基体中配混的良好分散的除氧微粒。该除氧制剂由平均粒度1-25μm并用至少一种或多种活化和酸化粉末状化合物预涂覆的铁粉末组成，其中该活化和酸化粉末化合物通常为碱金属和碱土金属的固态有机和无机盐的形式，如氯化钠和硫酸氢钠。通过采用常规的熔体加工方法如双螺杆挤出使所述预涂覆的铁微粒分散于聚合物树脂中。在熔化之前，以固态将所述除氧配混物与聚合物丸粒混合。优选地，用表面活性剂以干燥状态处理所述聚合物树脂丸粒和所述涂覆的铁粉末，以帮助分散该铁/盐粉末和树脂丸粒。将该熔体挤出的配混物制粒并保持为干燥状态以防止过早活化。

Description

含有除氧剂的层压和热成型的物品
相关申请的交叉引用
本申请是2009年4月1日提交的序列号为12/416,685的部分继续申请案和2010年3月10日提交的序列号为12/719,160的部分继续申请案。
发明背景
技术领域
本发明涉及用于处理树脂丸粒或涂覆的铁粉末以使分散最大化的表面活性剂，其包括润滑剂如矿物油，脂肪酸如硬脂酸，和低分子量化合物如蜡；由这样的材料制成的封盖膜(lidding film)和容器，尤其是由这样的膜制成的食品容器。本发明还涉及由含有除氧剂(oxygenscavenger)的层压膜构成的物品、由该层压膜或片热成型的物品、由层压纸板折叠的物品、制备用于食品包装的除氧物品的方法、含有除氧剂的可密封并可剥离的封盖膜、含有层压膜(其包含除氧剂)的可密封并可剥离的封盖膜、由聚合物或纸基材构成的可密封并可剥离的封盖膜、包含铁、电解质和任选的其他吸湿性添加剂的除氧膜。
刚性食品容器如肉托盘和一次性杯子被广泛用于食品包装和食品服务应用中。
用于肉或食品包装的常规托盘和容器通常是泡沫的，以减小重量而提供包装和运输的硬度。材料通常为聚苯乙烯。一些为聚乳酸和聚烯烃。
用于制造托盘或容器的其他常规材料是由单层或多层结构构成的固体片。通常使用氧隔离材料如EVOH。
容器的期望特征是保持食品的新鲜度。
改善肉包装新鲜度的一般方法是通过使用浸渍垫片除去多余的液体。更有效的方法是降低包装内的氧含量。
期望制造具有除氧能力和/或改进的氧隔离性能的片材(sheets)以保持食品新鲜度并阻止微生物生长。小袋(sachet)不适于包装生肉。
本发明的另一个目的是在塑料片和纸基材上提供用于制备层压物品的膜，该塑料片和纸基材可以热成型或折叠形成成型的物品，如容器、碗、托盘、杯子和山形盖顶纸板。
本发明的另一个目的是提供用于食品容器包装的封盖膜。封盖膜提供了清晰度、对容器良好的密封性、强度和保护性。封盖膜需要为可手工剥离的。期望封盖膜具有除氧能力以帮助食品保鲜。
本发明的其他目的是提供含有除氧剂并用作封盖膜的层压结构。
在可热成型的物品和可剥离的封盖膜中引入一层或多层活性清除剂或除氧剂的总体益处包括将除氧剂整合在食品包装或容器中、有效除氧而没有可视的小包或小袋、可弯折以加入到需要除氧的区域、包装装饰和区分、以及便于循环加工。
相关技术的描述
US 6,503,587B2(Mitsubishi Gas Chemical Co.)记载了具有夹在各层之间的除氧颗粒(包括铁)的多层层压制品。该方法可能导致层间粘附问题，其将不可避免地影响包装的机械和消耗性能。
US 6,821,594B2(Mitsubishi Gas Chemical Co.)记载了具有凸起结构的氧吸收标签方法。
US 6,559,205B2和7,056,565B1(Chevron Phillips Co.)记载了用于多层容器的有机基、支链和侧链(pendant)环烯族除氧剂。
US 7,494,605(Cryovac Corp.)记载了具有聚合物除氧剂的除氧膜。
US 6,746,772B2(Mitsubishi Gas Chemical Co.)记载了在膜中含有环氧固化剂的多层膜，该膜能够导致坚硬和脆性结构。
US 6,063,503(Mitsubishi Gas Chemical Co.)记载了具有层状结构和不同于本发明中所记载的除氧粒度的氧吸收多层膜。
于4/1/09提交的美国专利申请#：12/416685教导了除氧膜的制备。该膜由17/3/80比的铁、氯化钠和低密度聚乙烯挤出。该膜本身可以是单层或多层结构，其中除氧剂位于膜的任何一层中。
发明概述
在本发明中，描述了制造满足上述要求的多层除氧膜的方法。该方法包括挤出在聚合物基体中的细除氧颗粒(如美国专利6,899,822、美国专利申请2005/0205841和2007/020456中所记载的那些，其全部来自Multisorb Technologies Inc.，以引用的方式整体并入)以形成多层膜。该膜可以作为包装材料的一部分成型或用作包装内的标签或分隔物、或作为包装内产品的托盘或其他刚性支撑物的一部分。该膜可以用包装材料直接挤出，或通过后挤出加工步骤如层压、胶合或粘贴(taping)来与包装品合并。本发明尤其关注平均粒度1-25μm的铁基粉末，其中铁颗粒用活化和氧化反应促进剂颗粒预涂覆以形成均匀粉末。相比于更大的颗粒(差的透明度和反应性)和更小的纳米级颗粒(差的透明度)，采用细分散的这种除氧颗粒生产的膜或片有利地具有高透明度和对氧的高反应性。
本发明的目的是提供配混于聚合物基体中的良好分散的除氧微粒。该除氧制剂由平均粒度1-25μm并用至少一种或多种活化和酸化粉末状化合物(通常为碱金属和碱土金属的固态有机和无机盐的形式，如氯化钠和硫酸氢钠)预涂覆的铁粉末组成。通过采用常规的熔体加工方法如双螺杆挤出法使所述预涂覆的铁微粒分散于聚合物树脂中。在熔化之前，以固态将除氧配混物(compound)和聚合物丸粒混合。优选地，用表面活性剂以干燥状态处理所述聚合物树脂丸粒和涂覆的铁粉末，以帮助分散该铁/盐粉末和树脂丸粒。将该熔体挤出的配混物制粒并保持为干燥状态以防止过早活化。
本发明的另一个目的是提供具有与聚合物一起挤出的含铁配混物的多层挤出膜或片。该膜或片由三层相同的基体树脂以层厚度比5/90/5至25/50/25构成，其中中间(活性)层包含分散于树脂中的铁基除氧剂。在加工期间或之后，该多层膜可以是无定向的(非拉伸的)、单轴或双轴拉伸的。对活性层厚度、与多层结构的位置以及在其中的除氧微粒的分量进行适当调节，以提供期望的功能(如氧吸收率、活性隔离保护的持续时间和瞬时隔离的改善、或其结合)。
本发明的另一个目的是提供通过模切、制袋、制包、层压、热成型或其他转化过程，由挤出的膜或片而产品成型的物品。该物品可以是被粘结或嵌入标签的形式或作为袋膜的一部分以配合产品需要。具体地，将所述除氧膜层压、粘贴、结合在袋的一个内表面上，或简单地作为袋中的嵌入物(insert)储存。任选地，将所挤出的膜或片进行图形装饰，从而使其与该袋的图形设计相容。另外，可以将这些材料置于刚性容器的表面或作为封盖的货品。
本发明的另一个目的是提供含有配混于聚合物基体中的良好分散的除氧剂的印刷或涂覆的物件。该物件可以是在其上印刷或涂覆有除氧配混物的聚合物或金属基材。特别地，在形成袋、包或可弯折的食品包装的包围物(enclosure)前，可以在聚合物膜上挤出涂覆或溶液印刷该聚合物基体中的铁基除氧剂，并且特别地，该印刷或涂覆的图案是包装的图形设计的一部分。
本发明的另一个目的是提供由至少一层层压在基材上的活性膜构成的膜或片。所述活性膜含有除氧剂、电解质和任选的其他吸湿添加剂如硅胶、活性碳和其他吸着剂(sorbent)。图1示出层压有活性膜的片材的(a)两层结构和(b)三层结构的实施例。
本发明的另一个目的是提供由用于食品包装应用的层压膜或片热成型的物品。优选地，所述除氧膜位于所述物品的食品侧附近。图2示出一种实施例。
本发明的另一个目的是提供层压有至少一层除氧膜的纸或卡板。然后，将所述层压制品转化或折叠以形成用于液体包装或湿食品包装的盒子或包装物。
本发明的另一个目的是提供层压有至少一层除氧膜的纸或塑料膜。将所述层压制品用作用于容器或包装物的可剥离的封盖膜。通过热封或涂封将所述封盖附于所述容器。
本发明的另一个目的是提供制造用于食品包装的除氧物品的方法。该方法是在将所述层压制品转化为食品包装物品之前，将除氧膜层压至塑料和纸基材。
附图简述
图1-FreshBlend尼龙膜的氧吸收性能。
发明详述
图2是用根据本发明的膜制成的容器的横截面。
图3是载体片上的除氧膜的横截面图。
图4是在其两个表面上都具有除氧膜的基材的横截面图。
图5是层压有除氧膜的热成型的托盘的横截面图。
图6是制造根据本发明的托盘的层压机的示意图。
图7是根据本发明制造的两个托盘的透视图。
图8是根据本发明制造的两个托盘的透视图。
本发明涉及挤出除氧聚合物膜的方法，该除氧聚合物膜含有细分散的除氧微粒。所述除氧膜具有高透明度和可调的氧吸收率。本发明还涉及在制造塑料袋、包、可弯折的包围物和容器中使用这样的除氧膜，以通过吸收顶部空间的氧和/或提供(proving)对氧渗透的活性隔离来保持封闭在包装中的食品和其他消费品的新鲜度的方法。
可弯折食品包装材料(如用于塑料袋中的)通常要求良好的氧隔离性能，以防止微生物生长并保持食品的新鲜度。该需要可以通过例如用于牛肉干、香肠、加工肉类等的包装来示例。包含除氧剂的小袋包装通常用于食品袋中以吸收顶部空间的氧并吸收通过包装壁进入的氧。小袋已经用于即用式食品包装中很多年。然而，存在与使用小袋相关的潜在缺点和限制。其包括下述内容：
(a)小袋有时被错认为食品内含物的一部分并被消费者吃掉。
(b)小袋有时意外地划开导致其内含物溢出并当包围或紧固于食品袋或包装时污染食品。
(c)小袋由于其破坏食品包装的美感和外观而有时令人厌恶。
(d)小袋不能用于包装要求除氧的液体产品。
根据本发明，发现如果并入树脂中的除氧颗粒的尺寸为1-25μm并且尺寸最优选为2-5μm的话，聚合物膜或片基材的光学性能如接触透明度和可见光透射性被有利地改善。这样的颗粒足够小到肉眼不可见，并同时足够大到使由可与可见光波长(0.4-0.8μm)想比较的尺寸的颗粒引起的光散射最小化。结果是其中并入这样的颗粒的塑料物品的雾度降低。
另外，发现包括用于有效氧化的全部必要组分的复合除氧颗粒的更小尺寸(受在膜中产生明显光散射和雾度的小颗粒尺寸的限制)产生具有与渗透氧的更高效反应性的除氧膜并导致更有效的隔离结构设计。隔离膜反应性还有利地通过多层结构设计被改善，其中所述除氧层形成由相同基体树脂制成的3层结构的中间层。具体的最优层厚度比取决于总膜厚度和活化的清除剂的氧化动力学。
用于处理树脂丸粒或涂覆的铁粉末以使分散最大化的表面活性剂包括润滑剂如矿物油、脂肪酸如硬脂酸、和低分子量化合物如蜡。
减小的铁粉末优选具有1-25μm的平均颗粒尺寸，更优选1-10μm的平均值并最优选2-5μm的平均值。根据美国专利6,899,822、美国专利申请2005/0205841和2007/020456(以引用的方式并入)的教导选择涂覆在铁颗粒上的活化和酸化组分的组合和相关部分。该涂覆技术优选如上述参考文献中所记载的干法涂覆。
所述膜结构优选为层比例为25/50/25至1/98/1的3层或更多层，其中最优比取决于设计目的(如顶部空间的氧吸收速率)，一个实例的比为15/70/15。涂覆的铁优选位于该三层的中间。
用作标签、层压制品、封盖膜或托盘的嵌入物的膜可以由单或多层结构组成，其中涂覆的铁均匀分布于所述膜中或所选择的一层或多层中。对于多层结构，所述涂覆的铁优选位于该结构的中部。其可以邻近于外层以有助于吸收。
为了在基材上印刷或涂覆所述涂覆的铁制剂，可以在普通挤出涂覆聚合物如LDPE、EVA、EAA、PP、PS、蜡、乳剂等中配制所述涂覆的铁。
下述实施例用于示例本发明的某些部分。
实施例1.含有除氧剂的挤出的尼龙膜
通过用硫酸氢钠和氯化钠涂覆平均粒度4-5μm的铁微粒以形成均匀涂覆的复合粉末来制备除氧剂包装。如图6中所示，该复合粉末(缩写为“FreshBlend
Figure BPA00001641792200061
”，纽约布法罗的Multisorb Technologies，Inc.出售的除氧剂)用于与尼龙6树脂(Custom Resins Nylene 3411)一起挤出。Coperion双螺杆挤出机配混设备用于将FreshBlend和树脂配混。计量进料器用于在熔化之前精确进料FreshBlend粉末和该聚合物树脂。在进料至该挤出机之前，将该树脂丸粒与0.2重量％矿物油(零售药品等级)混合。对于所有加热区域，将该挤出机设置为250℃，模温为260℃。以可与挤出速率相比的速率将所述FreshBlend进料，以使重量比为5/95至20/80。在制粒之前，将所挤出的线材进行空气冷却或任选水冷却。
实施例2.除氧膜的挤出
通过使用实施例1中制备的FreshBlend配混物来制备除氧膜。从由三台挤出机、共挤出进料导管、和2”环形模具和0.060”模缝组成的共挤出吹膜生产线挤出三层膜。将膜制成吹胀比＝2和各种拉伸比以使得膜厚1.5-4密尔(mil)。该膜是清晰和透明的，稍带有或没有可见的结块。对于各层为尼龙/FreshBlend尼龙共混物/尼龙的材料，该膜具有约15/70/15的层比。通过降低(let-down)所述除氧配混物，净除氧剂内含物为1-3重量％。
实施例3.袋中除氧膜的性能
为了评价FreshBlend尼龙膜作为标签膜或袋中嵌入物膜的氧吸收性能，将所挤出的膜切成条带并存放在塑料袋中用于氧吸收性能测试。将具有选择重量的挤出的样品膜切割并存放在6”x6”尺寸的袋中。还将提供92％相对湿度的加湿剂存放在袋中以激活除氧剂的氧吸收能力。然后将所述袋密封并随后将O2/N2＝20/80的300cc气体混合物注入该袋中。通过使用Mocon型450顶部空间分析仪来周期性地测量氧气浓度。在图1中示出氧吸收性能。可以看出氧气浓度随时间逐渐下降，并且2重量％膜以比1重量％膜更高的速率下降。该实施例证实了所述除氧膜在包围物如袋中的效用。
图3是根据本发明制备的容器如食品容器的横截面图。托盘10由多层封盖材料密封。顶层20是用于支撑其他层的低至中等渗透性的结构层。优选地，层20至少部分地不可渗透氧。层18是在其上可以呈现包装印刷的聚酯层。优选地，层20足够透明，以使层18上的印刷清晰可见。层16是任选的基本上不可透氧的箔层。当使用层16时，结构层20的氧渗透性可以更低。层14是如本文所述的氧吸收层，层12是粘结剂剥离层，其具有高粘结性，但尽管如此例如通过拉动其角部并将该多层结构从该托盘剥离可从托盘10的上边缘剥离。优选地，层12粘结至层14与其粘结至托盘10至少同样牢固或更加牢固。
结构层20可由任何合适的材料如聚丁烯、聚乙烯、线性低密度聚乙烯或丙烯酸类形成。托盘10可以由高密度聚乙烯、聚苯乙烯或类似材料形成，并可以是泡沫的或半刚性的。
材料、制剂和产品结构的优选范围如下。
减小的铁粉末优选具有1-25μm的平均颗粒尺寸，更优选1-10μm的平均值并最优选2-5μm的平均值。根据美国专利6,899,822、美国专利申请2005/0205841和2007/020456(以引用的方式并入)的教导选择涂覆在铁颗粒上的活化和酸化组分的组合和相关部分。该涂覆技术优选为如上述参考文献中所记载的干法涂覆。
用于泡沫的主要聚合物是聚苯乙烯和苯乙烯-丁二烯共聚物。其他聚合物包括苯乙烯-乙烯共聚物、聚丙烯、聚乙烯、聚氨酯及其共聚物或衍生物。
本发明中公开的主要聚合物为聚乳酸及其共聚物或衍生物。优选的衍生物为支链PLA或轻微交联的PLA。其他生物可降解的聚合物包括聚羟基烷酸酯(PHA)脂肪族共聚酯，及其通常类型的聚合物—聚羟基丁酸酯(PHB)、聚己内酯、热塑性淀粉(TPS)、纤维素和其他多糖。全部都可以具有其变至宽范围的结晶度以导致各种物理性能。
片状基材—单层或多层形式的PP、PE、EVOH、PET、尼龙、PLA、PS，厚度为10-80密尔，优选15-60密尔，其可通过常规的热成型、真空成型、热压技术来热成型。所述基材可以是单层或多层结构。基材结构的实例为5层共挤出片如PE/连接层(tie)/EVOH/连接层/PE或PP/连接层/EVOH/连接层/PS等。“连接层”是指连接两种其他材料的粘结层。所述基材可以是3层结构如(PE+连接层)/EVOH/(PE+连接层)、尼龙/EVOH/尼龙等。其可以是通过挤出来制备的单层片如PP、PLA等。
泡沫基材—单层或多层形式的PP、PE、EVOH、PET、尼龙、PLA、PS PLA、PS，厚度为10-80密尔，闭合的单元容量50-100％，单元尺寸1-1000μm，并在任何泡沫密度范围内。所述泡沫基材可以由任何已知的发泡剂如丁烷、戊烷，CO2和水分构成。泡沫结构的实例为密度为2-5lb/ft3并且厚度为50密尔的常规聚苯乙烯泡沫托盘材料。该材料可以是具有支化剂或增链剂的PLA。
所述除氧膜优选为通过按照于4/1/09提交的美国专利申请#：12/416685来制备的Freshblend膜。该膜由17/3/80比的铁、氯化钠和低密度聚乙烯的混合物挤出。该膜本身可以是单层或多层结构，其中除氧剂位于膜结构的任何一层中。膜材料可以是聚烯烃如PE、PP、聚苯乙烯、PLA和其他常规聚合物。根据需要的不同，所述Freshblend含量可以为0.5-50重量％，优选1-10重量％。另外，所述Freshblend的沉积物可以形成条带图案或为所述Freshblend膜中的特定沉积物，从而提供完全透明的区域，在产品观察(viewing)重要的情况下尤其有用。
层压可以通过使用任何分批或连续层压加工设备来完成。层压时间和温度可以按照有利的条件来设定以实现最优的结合。对于挤出层压，预先制造的活性膜可以连续层压在被挤出的片上。膜也可以层压在从卷筒材料展开的片材上。
层压过程在图6中描述。
任选地，使用粘结层以增强所述活性膜和所述基材之间的粘结性。该粘结层可以包括马来酐改性的聚合物、EVA、EAA、EMA聚合物或共聚物，羟基改性的聚合物及其他。
下述实施例用于示例本发明的一些部分。
通过共挤出由LDPE/(PP+PE+Freshblend)/LDPE构成的3层结构以制造Freshblend膜来制造3.5密尔的膜。该Freshblend载荷为约6重量％并仅均匀分布在该膜的中间层。密度为约3lb/ft3的50密尔的聚苯乙烯泡沫片从商业来源获得。如下所示，通过在FB膜和泡沫片之间使用Dow IntegralTM 801粘结膜来在约90C下将所述膜层压在泡沫材料上以形成3层层压结构。
然后，在单腔热成型机中将所述层压片热成型，以形成图6所示的用于两个相同样品的5”x4”x1”托盘。
图7示出如下实施例的从Freshblend膜层压的聚苯乙烯泡沫片热成型的容器。
实施例2含有FreshBlend(FB)膜的热成型的聚苯乙烯容器
使用同样的粘结膜将所述FB膜层压在30密尔的高冲击聚苯乙烯片上，并将其热成型在如图7所示的5”x4”x2”容器上。将右侧的FB容器与左侧所示的非FB容器进行比较。
通过使用同样的片状层压材料将杯子热成型，产品如图8所示。
实施例3.含有Freshblend膜的热成型的隔离容器
将FB膜层压在由Spartech生产的下述两个隔离片上：
PE/EVOH/PS-45密尔
PE/EVOH/PS-50密尔
通过使用同样的热成型方法制造容器。
图7示出由Freshblend膜层压的高冲击聚苯乙烯片热成型的容器。
图8示出由Freshblend膜层压的高冲击聚苯乙烯片热成型的杯子。
实施例4含有Freshblend的可剥离的封盖层
如图2所示的可剥离的封盖层可通过将以下三种材料层压来制备：
层1：印刷的或反面印刷的基材—聚烯烃、PET、纸张
层2：Freshblend膜—如上所述的含有Freshblend的单层或多层
层3：任选的密封材料层—LDPE或丙烯酸基树脂
可以将三层或更多材料热层压或涂覆层压以形成1-40密尔，优选2-10密尔的单个整体。然后，将层压材料用作可剥离的封盖膜用于杯子、托盘、碗和其他用于食品包装的容器。
尽管已经参照具体实施方案在本文中示例并描述了本发明，但不倾向于将本发明限定于所示的具体方式。更确切地说，可以在权利要求的等同方案的范围内并且不脱离本发明来具体作出各种变形。因此，倾向于所附的权利要求覆盖所有这样的落入本发明的精神和范围内的变体。

Claims (17)

1.用于制造氧吸附托盘的方法，该托盘具有包括在聚合物基体中的细分散的铁/盐颗粒的层，该方法包括用至少一种或多种活化和酸化粉末状组分预涂覆平均粒度1-25μm的铁，在熔体挤出成配混物之前以固态将该除氧剂与聚合物混合，在混合之前用表面活性剂处理丸粒或铁/盐粉末，通过挤出形成膜，将该膜层压至基材，并使该基材成型为托盘。
2.用于在氧存在下降解的材料的容器，其包括位于其它层之间的除氧膜和延其边缘密封至该膜的托盘，其中所述除氧膜由三或更多个含有根据权利要求1制备的除氧微粒的层。
3.袋、包、可弯折的包围物或容器，其由根据权利要求1的除氧膜构成，成型为嵌入物、层压制品或作为多层结构的一部分，其中该除氧膜在所述包围物中提供(deliver)氧吸收性能。
4.袋、包或可弯折的包围物，其由在包装中作为包装或图形设计的一部分的根据权利要求1的除氧剂构成。
5.用于在氧存在下降解的产品的容器，其包括层压有膜的托盘，该膜由在聚合物基体中细分散的铁/盐颗粒制成，该聚合物基体包含平均粒度1-25μm的铁，其中铁在熔体挤出成配混物之前，用至少一种或多种活化和酸化粉末状组分预涂覆并且在与聚合物以固态混合之前用表面活性剂处理。
6.权利要求5的容器，其具有最小可见结块的高透明度，包括位于其它层之间的三个或更多个含有除氧微粒的塑料层。
7.袋、包、可弯折的包围物或容器，其包括根据权利要求5的除氧膜，该除氧膜为嵌入物、层压制品的形式或作为多层结构的一部分，其中该除氧膜在所述包围物中提供氧吸收性能。
8.袋、包或可弯折的包围物，其由在包装中作为包装或图形设计的一部分的根据权利要求5的除氧剂构成。
9.热成型的食品容器，其包括非除氧的基体和层压于该基体内部的除氧膜。
10.权利要求9的容器，其中所述膜包括除氧剂和吸湿剂。
11.权利要求9的容器，其中所述基体包括纸张、卡板、泡沫和塑料中的一种。
12.食品容器，包括基体和密封至该基体的可剥离的除氧膜。
13.权利要求12的容器，其中所述膜通过热封和涂封之一密封于所述基体。
14.权利要求9的容器，其中所述基体包括由聚苯乙烯、苯乙烯-丁二烯共聚物、苯乙烯-乙烯共聚物、聚丙烯、聚乙烯、聚氨酯、及其任何一种的共聚物或衍生物的一种或多种成型的泡沫。
15.权利要求12的食品容器，其中所述基体包括由聚苯乙烯、苯乙烯-丁二烯共聚物、苯乙烯-乙烯共聚物、聚丙烯、聚乙烯、聚氨酯、及其任何一种的共聚物或衍生物的一种或多种成型的泡沫。
16.权利要求15的食品容器，其中所述可剥离的膜包括由聚丙烯、聚乙烯、乙烯乙烯醇、聚对苯二甲酸乙二酯、尼龙、聚乳酸和聚苯乙烯的一种或多种成型的基材。
17.权利要求16的食品容器，其中所述膜包括具有一个或多个粘结层的多层膜。
CN2011800249358A 2010-03-08 2011-03-03 含有除氧剂的层压和热成型的物品 Pending CN103003065A (zh)

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