CN111328309A - 生产用于3件式罐的聚合物涂覆的钢片材的方法及其用途 - Google Patents

生产用于3件式罐的聚合物涂覆的钢片材的方法及其用途 Download PDF

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CN111328309A
CN111328309A CN201880072835.4A CN201880072835A CN111328309A CN 111328309 A CN111328309 A CN 111328309A CN 201880072835 A CN201880072835 A CN 201880072835A CN 111328309 A CN111328309 A CN 111328309A
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polymer
tinplate
polymer film
film
strips
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CN111328309B (zh
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G·C·迪森
J·P·彭宁
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Tata Steel Ijmuiden BV
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Abstract

本发明涉及生产用于3件式罐的聚合物涂覆钢片材的方法及其生产的3件式罐。

Description

生产用于3件式罐的聚合物涂覆的钢片材的方法及其用途
技术领域
本发明涉及生产用于3件式罐的聚合物涂覆钢片材的方法及由其生产的3件式罐。
背景技术
3件式罐由三个主要部分组成：底盖、主体和顶盖。顶盖可以是易于打开的端部，或可以用开罐器打开的常规盖，或者它可以是油漆罐的盖(可由环和盖组成)等。
罐的主体可以是柱形、正方形、矩形或其他形状。主体是由单片金属片材(通常为马口铁)生产的，制成适当形状如柱形然后在边缘焊接以生产管材。然后将底盖接合到主体上。可以在罐主体上设置珠子以增加罐的强度。然后将这些半成品罐装到装填机中，该装填机将罐用预期内容物装满，并用顶盖密封该罐。
在此过程中，单一片材的焊接对于生产管状罐主体是重要的。最常使用马口铁(tinplate),它是一种在任一面都设有锡层的钢基材，因为它既耐腐蚀又可焊接。然而，对资源的增加压力以及锡价格的因此上升导致对于减少钢基材任一侧上的锡量需求。这可以通过在罐主体的任一侧上使用不同厚度的锡层，通过根据将来的内容物减少锡层的厚度，或通过使用额外的涂层保护薄锡层来实现。在大多数情况下，将漆用作附加涂料。对BPA的关注增加了对于限制制罐中使用漆的需求。
这些附加涂层的问题在于，这些涂层通常是不可焊接的，并且需要在焊接之前从待焊接区域去除。该额外的处理步骤是不希望的。
JPH06182954公开了一种方法，其中将要层压到钢板上的双轴取向PET膜切分成聚合物条带，然后加热，使得由于膜的收缩而使狭缝张开。随后将各个聚合物条带层压到金属板上，其中裸露材料的宽度由膜的收缩程度确定。
GB2265568公开了一种双轴取向PET膜，该膜预先在一侧上涂有丙烯酸树脂的热固性透明清漆并干燥。膜的另一面具有三个用于罐主体的印刷品的重复图像通道(lane)，所述通道在膜的长度方向上延伸，这是通过使用已知的凹版印刷机进行的多色印刷来进行的。在膜上提供这些印刷部分的通道，每个通道的宽度为162mm，在印刷部分A的每个相邻通道之间提供两个4毫米宽的非印刷部分B。在印刷的最后步骤中，膜的印刷面的整个表面通过凹版辊用粘合剂涂覆，然后将其干燥，所述粘合剂例如是主要由聚氨酯树脂、丙烯酸树脂或聚酯树脂组成的粘合剂，每者是油墨的树脂成分。在将印刷的条带层压到卷曲的金属片材上之前，将未印刷的条带切出并去除，从而留下窄的片材条带未涂覆。
根据JPH06182954的方法的缺点在于，裸露条带的精度取决于膜的收缩程度，因此需要拉伸的材料。GB2265568的缺点在于，一旦被涂覆，PET膜仍会包含内部应力，因为在生产3件式罐主体之后，在覆盖焊接区域的清漆的固化期间可导致收缩。
发明目的
本发明的目的是提供一种用于生产3件式罐的金属片材，其可焊接而无需在焊接之前去除该额外的涂层。
本发明的另一个目的是提供一种用于生产3件式罐的金属片材，其减少了漆的使用。
本发明的另一个目的是提供一种用于生产3件式罐的金属片材，该罐具有尺寸良好控制的未涂覆区域。
本发明的另一个目的是提供一种用于生产3件式罐的金属片材，该金属片材在层压期间和之后不会遭受涂层的收缩。
发明内容
一种制造用于三件式罐主体的聚合物涂覆的马口铁的方法实现了一个或两个目的，该方法包括以下步骤：
-提供条带形式的马口铁；
-通过挤压生产一个或两个聚合物膜；
-使用切分装置在纵向上将一个或多个挤压的聚合物膜切分成至少N个宽的聚合物膜条带和(N-1)个窄的聚合物膜条带，其中N为至少2；
-通过排放装置将窄的聚合物条带从宽的聚合物条带引离；
-预热马口铁，然后通过轧辊组件将宽的聚合物膜条带涂覆在预热的马口铁上，以获得聚合物涂覆的马口铁，其中多个聚合物膜条带在纵向上被不含所述聚合物膜的窄条带在空间上隔开，其中马口铁的边缘保持没有所述聚合物膜；
-在后加热装置中将聚合物涂覆的马口铁后加热至高于一个或多个聚合物膜的熔点的温度，或者如果该聚合物膜是多层系统，则加热至高于在多层系统中具有最高熔化温度的聚合物膜层的熔点的温度；
-将后加热的聚合物涂覆的马口铁进行淬冷。
在从属权利要求中提供了优选的实施方案。
根据本发明的方法导致马口铁条带涂覆有由更宽的聚合物膜生产的聚合物膜的条带，该聚合物膜是通过在线挤压生产的。在本发明的上下文中，“在线”应理解为构成连续操作序列的主要部分。因此，以连续的操作顺序进行一个或两个聚合物膜的生产，以及将切开的宽的聚合物膜涂覆在马口铁上。为了避免任何误解，根据本发明的方法未使用如JPH10151701中的预制卷曲膜。根据本发明的方法可以在马口铁的一侧上进行，由此仅需要一个挤压的聚合物膜，或者在两侧上进行，由此需要两个挤压的聚合物膜。双侧上层压可以同时或连续进行。将聚合物膜从扁平模头挤压，在挤压模头和流延辊之间形成的狭窄间隙中拉下，并以最终所需的厚度流延到流延辊上，在此处迅速冷却它。由于拉伸至最终厚度是在液体条件下进行的，因此流延膜基本上是非取向的。将挤压的膜切开并且将宽的聚合物膜之间的窄的聚合物条带引离并除去。由挤压的聚合物膜生产的宽聚合物膜的数目可以为2或更多。在说明性的图1至4中，通过示例使用了四个宽的聚合物膜，但是本发明对于两个、三个或更多宽的聚合物膜也有效。从要排放的宽聚合物条带之间切出的窄聚合物条带的数量原则上总是比要层压在马口铁上的宽聚合物条带的数量低1。挤压的聚合物膜的宽度应小于马口铁的宽度，以使马口铁的边缘保持未涂覆。如果聚合物膜变得对于马口铁的边缘太宽而无法使保持未涂覆(即裸露)，则可需要对聚合物膜的边缘进行在线修整。将这些切下的边缘从聚合物膜上引离，然后在层压过程中将膜涂覆到马口铁上，使马口铁的最外边缘裸露没有聚合物。这可优于在层压过程之后涂覆边缘并研磨掉或以其他方式除去聚合物涂层的边缘的替代方案。可以通过切割废料提取装置例如通过抽吸装置来完成聚合物膜的切除边缘的引离。在一连续的操作中进行从流延辊上的平模头上挤压聚合物膜，然后在加热的马口铁上切分和层压的过程，没有间断，即在线进行。
US9186875公开了一种在整个宽度上层压具有预先生产的双轴取向聚合物膜的金属基材的方法。US9186875还公开了对于用于三件式罐主体的多层膜涂层，可以由单一膜形成所述膜，在线切开该单一膜，并且各个膜通过间隙方法(例如通过操纵每个膜或通过利用弓形辊)分开。或者，将宽膜离线预切开，然后将单个卷材安装并在一个或多个轴上并设有间隙。然后将它们送入压膜机。
US7942991涉及一种层压方法，其同时在结晶聚酯膜中产生期望的商业产品，并且公开了可以将多个膜宽段同时以隔开它们的间隙施加到金属基材，例如用于三件式罐主体。可以将这些膜与单个预先生产的膜分开，将其在线切开并通过设置间隙方法分开，或者可以安装几个膜并设置间隙。
用于切开挤压的聚合物膜的切割装置可以是刀诸如剃刀，或任何其他已知切割装置诸如电阻加热丝，或激光。只要切分装置能够以挤压机的运行速度提供干净的切缝，切割装置的类型就没有特别的关系。
将通过切割废料提取装置如抽吸装置引离窄的聚合物膜条带。由于聚合物膜非常薄(约数十微米)，所以膜也非常轻，而且还可以通过靶向抽吸作用轻松地将膜除去。
在将挤压的聚合物膜切开并引离窄的聚合物条带之后，将分开的两个或更多个宽的聚合物膜输送到轧辊(nip roll)组件，在此将分开的两个或更多个宽的聚合物膜压到预热的马口铁条带上以在马口铁和宽聚合物膜之间产生永久性粘结。切割后必须引离窄条带，以免弄脏轧辊组件中的层压过程。在聚合物膜的挤压与将所得的宽聚合物膜输送到轧辊组件之间，在线进行挤压的聚合物膜的切开和窄聚合物条带的引离，用以随后将宽的聚合物膜条带涂覆到预热的马口铁上。
挤压的聚合物膜、所得的宽聚合物膜和马口铁的行进方向是挤压机和轧辊组合的机器方向，并且由于切割装置和轧辊组件之间的距离优选尽可能短，行进方向保持不变并平行于机器方向，因此通过从宽的聚合物膜条带之间除去窄的聚合物膜条带而形成的间隙的宽度与聚合物涂覆的马口铁的无聚合物窄条带的宽度基本相同。术语基本用于意指由于振动或局部效应而可能出现的微小差异，但是不打算任何导致宽聚合物膜之间的间隙变宽或减小。切开后不可能增加间隙，例如如JPH10151701。转向辊没有空间，而且与挤压机结合会使该过程过于复杂。JPH10151701涉及预制的卷曲树脂膜的用途。此外，如果改变行进方向以增加间隙，则对于本发明的挤压膜，存在宽聚合物膜条带断裂或弯曲的显著风险。
优选地，钢基材是碳钢，优选低碳钢、超低碳钢、极低碳钢或HSLA钢。钢基材的厚度通常在0.10和0.49mm之间。这些非合金(ULC、LC和ELC)或微合金(HSLA)钢是相对便宜的基材，并提供良好的强度和可成形性。这些钢是通过公知方法如铸造、热轧和冷轧生产的。低碳钢通常包含0.05至0.15重量％C，超低碳钢通常包含0.02至0.05重量％C。极低碳钢通常包含低于0.01重量％C。根据EN10020-2000，除了碳以外，还可以存在其他元素，该EN10020-2000规定了可以存在多少特定元素而仍被认为是非合金钢。
在进入轧辊组件并与宽的聚合物膜条带汇合之前，将马口铁预热至一定温度，优选至少为190℃，以确保聚合物与马口铁的良好粘合。预热的马口铁的实际温度取决于要层压在其上的聚合物，还取决于马口铁的厚度，因为较薄的马口铁将包含较少的热量以提供聚合物层与马口铁的热结合。因此，出于这个原因，必须将较薄的马口铁再加热到较高的温度。锡的熔点
Figure BDA0002485610350000061
将所述预热限制在230℃。在此再次非常重要地注意，对于本发明而言重要的是，通过挤压方法生产的聚合物膜基本是非取向的。与金属层压工艺中使用的许多商用聚合物膜不同，本发明中的聚合物膜不是单轴或双轴取向的，因此，当通过预热的马口铁加热时或在辊轧辊组件中进行层压时，聚合物膜不会收缩。在从挤压物切割之后，将该挤压的聚合物膜和宽的聚合物膜引导到层压所需的少量张力不认为是拉伸，因为这种拉伸基本上是弹性的。这意味着不通过不受控的切割和因收缩而增大间隙(如JPH06182954那样)来产生宽聚合物条带之间的间隙。一个大优点是，聚合物膜与马口铁的粘合性显著更好。在形成用于3件式罐的罐主体之后，它还可以在涂漆焊缝的固化过程中防止膜的任何收缩。
3件式罐主体的焊接在坯料的未涂覆的马口铁边缘上进行(见图6，其中1是未涂覆的马口铁，3a是聚合物涂层，而17是施加于焊缝的漆)，从而形成所谓的侧缝。侧缝中的暴露金属需要通过施加合适的防护漆覆盖，此过程称为侧条带化(striping)。通常需要在升高的温度下固化该漆17，并且由于聚合物膜未拉伸并且因此未取向，因此使用根据本发明的聚合物涂覆的坯料防止了膜的收缩。此外，通过利用聚合物膜的收缩来增加间隙不如切割和引离窄的聚合物膜条带那样一致，因此根据本发明的方法的尺寸稳定性好得多。
在轧辊组件中将宽的聚合物膜条带层压到马口铁上之后，将聚合物涂覆的马口铁在后加热装置中后加热至高于一个或多个聚合物膜熔点的温度，或者如果聚合物膜为多层系统，则后加热至高于该多层系统中具有最高熔融温度的聚合物膜层的熔点。此后，立即将聚合物涂覆的马口铁以足够高的冷却速率淬冷到足够低以尽可能地抑制结晶的温度，优选完全抑制结晶。水淬是足够的并且经常使用。对于大多数聚酯，低于50℃的淬冷温度是好的指导原则。低于玻璃温度(Tg)时，聚合物链不再移动。50℃数值低于大多数芳族(共)聚酯的玻璃温度。聚烯烃的Tg显著更低，甚至低于0℃，因此这里的问题是尽可能抑制结晶，特别是避免大(球状)晶体的生长。只要足够快，在这种淬冷中获得的冷却速率就不是特别关键，并且合适的值在约50至300℃/s之间，例如约100℃/s。所需的预热和后热温度以及冷却速率和冷却温度取决于所用聚合物的类型，并且可以根据以上所述容易地确定。后加热温度优选为至少235℃，但是在任何情况下，后加热温度是高于一个或多个聚合物膜的熔点的温度，或者如果该聚合物膜是多层体系，则高于多层系统中具有最高熔化温度的该聚合物膜层的熔点的温度。如果条带两侧的聚合物不同，则最高熔融温度将决定后加热温度。将所有聚合物加热到高于该熔融温度是必要的。
如果后加热温度高于锡的熔点，则所得的锡层将与来自钢的铁变成合金化的。该过程与在马口铁的流熔过程中发生的正常合金化非常相似，并且它改善了马口铁层对钢的粘合以及聚合物对锡或锡合金层的粘合。
可以通过根据本发明的方法生产的聚合物膜涂层优选地基于聚酯，共聚酯(包括PET、PBT)，聚酯的共混物，例如PET：PBT共混物，聚酰胺，聚烯烃，弹性体或可以通过挤压形成膜的任何其他聚合物。聚合物涂层可以由一个或多个层组成。
在优选的实施方案中，聚合物膜包含熔点高于200℃的热塑性聚合物或由其组成。这些涂覆层的实例包含芳族聚酯，例如聚对苯二甲酸乙二醇酯、聚对苯二甲酸丙二醇酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯和聚萘二甲酸丁二酯；酸改性的聚对苯二甲酸乙二醇酯共聚酯，包含间苯二酸酯；二醇改性的聚对苯二甲酸乙二醇酯共聚酯，包含环己烷二甲醇、2,2,4,4-四甲基-1,3-环丁二醇或异山梨醇；包含两种或更多种上述均聚物或共聚物的共混物，或由以上组成。熔点高于200℃的涂覆层的其他实例包含某些聚酰胺，包括聚己内酰胺(聚酰胺-6)、聚(六亚甲基己二酰胺)(聚酰胺-6,6)，聚(四亚甲基己二酰胺)(聚酰胺-4,6)、聚(六亚甲基十二酰胺)(聚酰胺6,12)、聚(苯二甲基己二酰胺)(MXD6)及其共混物，或由以上组成。
附图的简要说明
现在将参考以下附图进一步说明本发明。
图1(未按比例)显示了马口铁1，聚合物膜2和切分成四个宽条带(3a-3d)和三个窄条带(4a-4c)的聚合物膜，将三个窄条带除去使得仅保留宽条带(图3a-3d)用于在涂覆生产线中进一步加工。
图2(未按比例)显示了涂有四个宽条带(8a-8d)的马口铁，这些条带已层压到马口铁上，进行了后加热和淬冷。聚合物膜条带(8a-8d)处于非晶态。在下方示出了沿线A---A的横截面，示出了马口铁和四个宽条带(8a-8d)以及无聚合物的边缘(10a-10b)和无聚合物的窄条带(9a-9c)。
图3(未按比例)示意性地显示了如何将聚合物涂覆的马口铁纵长地切分成四个窄的聚合物涂覆的马口铁条带，以及(在左侧)如何可从聚合物涂覆的马口铁或窄的聚合物涂覆马口铁条带中生产单独的坯料。这些坯料的边缘没有聚合物，因此对于制成3件式罐主体是可焊接的。
图4A至图4C(未按比例)示出了沿线A---A的横截面，示出了当在具有四个宽条带两侧上都涂覆时的聚合物涂覆的马口铁。注意，在该图中，宽的聚合物膜条带相对于马口铁的中心线对称放置。原则上，取决于坯料尺寸、罐主体和制罐者，在该位置可以具有一定程度的不对称性。宽的聚合物条带在两侧上不必具有相同的宽度。图4B示出8a宽于11a等，使得图2中描绘并用9a-9c表示的无聚合物的部分在条带的任一侧上的宽度不同。8a和11a也可以具有相同的宽度。但是它们可相对于另一个发生变化(图4C)。
图5示出了挤压机12，其将熔融的聚合物挤压到冷却的导辊13上以形成挤压的聚合物膜2。该膜随后被输送至切割装置5，用于将挤压的聚合物膜2切分成宽的聚合物膜条带3a-3d和窄的聚合物膜条带4a-4c以及任选的挤压的聚合物膜的边缘4d，4e。通过切割废料提取装置6将这些窄的聚合物膜条带以及任选的边缘引离并去除。宽的聚合物膜条带3a-3d进一步行进到两个辊7，其位置使得在两个辊之间存在辊隙，使预热的马口铁1连同窄的聚合物膜条带一起通过该辊隙。在加热装置14中预热马口铁，并且通过两个辊的挤压作用，将宽的聚合物膜条带3a-3d层压到马口铁上，并通过该膜层压工艺固定地与其结合。将聚合物涂覆的马口铁引至后加热装置15，在此将聚合物涂覆的马口铁加热至高于一个或多个聚合物膜的至少熔点，或者如果该聚合物膜是多层系统，则加热至高于多层系统中具有最高熔化温度的聚合物膜层的熔点的温度，然后在淬冷装置16中淬冷。淬冷后，将聚合物涂覆的马口铁卷曲，并准备进一步加工成3件式罐主体。加热装置14基于感应、加热的导辊、热空气或其他方式工作。
图5所示的设备是单侧层压。然而，可以容易地将该装置制成对称的，使得可以同时在两侧上进行聚合物涂覆。注意，图5中的设备是示意图，并且尺寸并非旨在正确。例如，将切割装置5定位成靠近层压辊，并且宽的聚合物条带在去除窄的聚合物条带之后行进的距离尽可能短以防止尺寸不正确。一旦窄条带和任选的边缘切段4a-4e被切下，它们就被引向切割废料提取装置6，以防止对层压过程的任何干扰。
图6示出了焊接的3件式罐主体的横截面，并且图的左侧示出了焊接部分的放大部分。清楚地示出了裸露的马口铁边缘以及宽聚合物膜条带3a的边缘以及通过焊接结合在一起的两个裸露边缘的部分。随后将焊接的和裸露的金属用漆17覆盖以保护金属不受腐蚀。漆优选不含BPA。
实施例
实施例1：借助于加热装置14将厚度为0.20mm的马口铁1加热至230℃的温度。通过喷嘴12在导向辊13上挤压聚合物膜(PET)。然后将冷却的挤压聚合物膜2输送到优选的橡胶涂覆的接触辊7。在行进过程中，可以监控厚度、颜色和条带张力，并修整到正确的宽度。切割装置5将膜切分成宽的聚合物膜条带3a-3d和窄的聚合物膜条带4a-4c(作为边缘4d，4e的切段)，通过抽吸经过6将其移出。挤压的聚合物膜的厚度为约30μm。通过将聚合物压在两个辊7之间的辊隙中的马口铁上，将聚合物膜条带涂覆到预热的马口铁上。例如通过金属冷却辊或通过在橡胶表面上的气刀在外部冷却这些辊的橡胶。然后将涂覆的条带进行短暂的额外热处理至260℃，以优化粘合力。产生了良好的产品，特别适合于例如3件式罐的盖子。
实施例2：使ETP条带的两侧上涂覆有2.0g/m2的锡，并进行311钝化处理。该条带涂有聚合物涂层，该涂层将成为罐主体的内部涂层，另一侧上为另一涂层(外部涂层)。内部涂层由4μm的粘合层，12μm的中间层和4μm的顶层组成，所有三层均由PET的共混物或PET的共聚物组成。外部涂层由4μm的粘合层、12μm的中间层和4μm的顶层组成，所有三层均由PET和PBT的共混物组成。在涂覆过程中，去除了2条宽度为5mm的窄聚合物膜条带，并去除了边缘，以使马口铁的10mm边缘裸露。获得了三个宽度为310mm的ETP的聚合物涂覆条带。用这些条带可以生产罐主体。
下面给出了用于根据本发明的方法的由三个子层组成的聚合物膜的典型配方。在以下实例中，五种不同类型的聚酯树脂用于生产不同类型的聚酯子层：
·IPA-PET：(聚对苯二甲酸乙二醇酯)共聚物，其中约3摩尔％的对苯二甲酸单体单元已被间苯二甲酸单体单元取代
·PETg：聚(对苯二甲酸乙二醇酯)共聚物，其中约30摩尔％的乙二醇单体单元已被环己烷-二甲醇单体单元取代
·PBT：聚对苯二甲酸丁二醇酯均聚物
·Ti02MB：TiO2和CHDM-PET的50/50重量％的混合物。
表1聚酯膜配方(典型尺寸为4：12：4μm，总计20μm)。
Figure BDA0002485610350000111
聚合物膜的另一实例包含以下或仅由以下组成：包含PET和改性PET(IPA-PET)组合的内层作为粘合层，由PET和PBT的共混物和/或共聚物组成的层作为主层或阻挡层，和包含PET、改性PET或PET：PBT共混物的外(顶层)层。
可以使用PET和PBT的已知共混物。如今，25：70的PBT和30:75％的PET的比例为常见的。
对于技术人员将清楚的是，可以对于金属性基材的单侧或双侧涂层应用本发明，所述基材在每一侧上具有相同的聚合物层，或不同的聚合物层，例如在一侧上的涂层体系A和在另一侧上的涂层体系E。

Claims (12)

1.制造用于3件式罐主体的聚合物涂覆的马口铁的方法，包括以下步骤：
-提供条带形式的马口铁(1)；
-和通过挤压产生一个或两个聚合物膜(2)；
-使用切分装置在纵向上将一个或多个挤压的聚合物膜切分成至少N个宽的聚合物膜条带(3a-3d)和(N-1)个窄的聚合物膜条带(4a-4c)，其中N为至少2；
-通过排放装置(6)将窄的聚合物条带从宽的聚合物条带引离；
-预热马口铁，然后通过轧辊组件(7)将宽的聚合物膜条带涂覆到预热的马口铁上，以获得聚合物涂覆的马口铁，其中多个聚合物膜条带(8a-8d)在纵向上被不含所述聚合物膜的窄条带(9a-9c)在空间上隔开，其中马口铁的边缘(10a，10b)保持没有所述聚合物膜；
-在后加热装置中将聚合物涂覆的马口铁后加热至高于所述一个或多个聚合物膜的熔点的温度，或者如果该聚合物膜是多层系统，则加热至高于在多层系统中具有最高熔化温度的聚合物膜层的熔点的温度；
-将后加热的聚合物涂覆的马口铁进行淬冷。
2.根据权利要求1所述的方法，其中修整所述聚合物膜(2)的边缘以确保所述聚合物膜的宽度小于所述马口铁(1)的宽度，以使所述聚合物涂覆的马口铁的边缘无聚合物膜。
3.根据权利要求1所述的方法，其中将所述淬冷的聚合物涂覆的马口铁切分成多个条带，其中所述切分在纵向上并且在没有聚合物膜的窄条带(9a-9c)中进行。
4.根据权利要求1至3中任一项所述的方法，其中由所述经淬冷的聚合物涂覆的马口铁生产用于生产3件式罐主体的坯料。
5.根据权利要求1-4中任一项的方法，其中所述聚合物膜包含聚酯、共聚酯、聚酯的共混物、聚酰胺或聚烯烃。
6.根据权利要求1至5中任一项所述的方法，其中所述聚合物膜的厚度在5至35μm之间。
7.根据权利要求1至6中任一项所述的方法，其中通过挤压工艺生产的一个或多个聚合物膜基本上是非取向的。
8.根据权利要求1至7中任一项所述的方法，其中所述挤压的聚合物膜、所得的宽聚合物膜和所述马口铁的行进方向是所述挤压机和轧辊组合的机器方向，并且其中行进方向保持不变并平行于机器方向，使得通过从宽的聚合物膜条带之间去除窄的聚合物膜条带而形成的间隙的宽度与聚合物涂覆的马口铁的无聚合物的窄条带的宽度相同。
9.根据权利要求1至8中任一项所述的方法，其中所述后加热温度高于锡的熔点以实现所得的锡层将与来自钢基材的铁变成合金化的，从而改善所述马口铁层对钢基材的粘合以及聚合物对锡或锡合金层的粘合。
10.根据权利要求9所述的方法，其中所述后加热温度为至少235℃。
11.根据权利要求1至10中任一项所述的方法，其中所述聚合物膜不是单轴或双轴取向的，因此在由所述预热的马口铁加热时或在辊压组件中的层压期间不会收缩。
12.根据权利要求1至11中任一项所述的聚合物涂覆的马口铁的用途，用于生产3件式罐主体。
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