CN1045923C - 层压金属片及其制造方法 - Google Patents

层压金属片及其制造方法 Download PDF

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CN1045923C
CN1045923C CN88107071A CN88107071A CN1045923C CN 1045923 C CN1045923 C CN 1045923C CN 88107071 A CN88107071 A CN 88107071A CN 88107071 A CN88107071 A CN 88107071A CN 1045923 C CN1045923 C CN 1045923C
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polyester
laminate
metal
film
layer
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CN1032765A (zh
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彼得·约翰·海伊斯
尼古拉斯·约翰·米德尔顿
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Crown Packaging UK Ltd
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    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
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    • B32B2310/04Treatment by energy or chemical effects using liquids, gas or steam
    • B32B2310/0409Treatment by energy or chemical effects using liquids, gas or steam using liquids
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    • BPERFORMING OPERATIONS; TRANSPORTING
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

一种层压的金属片,此金属片在其至少一侧主面上粘合有一层非结晶的聚酯,以及一种制造它的方法,此种层压金属片特别适用于成形冲拔和薄壁拉伸的(DWI)罐。这种层压件也适用来形成其它非压热处理的包装部件。

Description

层压金属片及其制造方法
本发明涉及层压金属片以及生产这种层压金属片的方法。
使聚合物材料在金属带之类的金属片上进行层压成形乃是一种周知的得到普遍确认的技术。这样获得的层压件具有多方面的应用,包括以之来制造冲拔和薄壁拉深的罐(也称作为DWI罐)。
已知可用钢或铝覆以聚烯烃涂层来作为制备DWI罐的坯料。这类材料例如见于美国专利4096815号与英国专利2003415号中所描述的,而就我们所知,这种材料尚未获得商品化应用。
已了解到,聚烯烃涂层并不能象热塑性聚酯那样成形。聚酯涂层对钢与铝的层压结构,例如有英国专利号2123746与2164899所作的描述。但是,这些专利强调,为了使罐壳获得足够的寿命,必须在聚酯涂层中保持着一定的双轴性定向。本发明人等认识到,以上专利中所述的这类层压件,是不能经受制备深冲拔的或DWI罐时不使聚酯涂层发生严重碎裂之成形操作要求的。英国专利2123746或2164899号所述在这种涂层中保持定向的作法,使涂层在断裂值下的延伸率限制到超出DWI罐成形作业所要求的相当低的数值。因而,这样的层压件是不道用来成形DWI罐的。
本发明人等得知,于金属片上粘合一层基本上属非结晶(或无定形)形式的热塑性聚合物,能经受住DWI作业和保持住合格的金属覆盖厚度。这样的涂层在DWI罐的成形中优于聚烯烃涂层,同时保持着更好的连续性与防护性。
据此,本发明在其一个方面是提供一种层压的金属片,此金属片的一面或两面上直接粘附有一层非结晶聚酯膜。
上述的非结晶聚酯(这里也称作为无定形聚酯)经X射线衍射(XRD)或密度测量法测定,应该基本上是无定向的。
由X射线衍射测定结晶度的一种方法已给出在英国专利1566422号中。结晶度能据密度测量法测定如下:
Vc=体积分率结晶度
Vc=(P-Pa)·(P-Pc)-1
P=聚酯密度
Pa=无定形聚酯密度
Pc=结晶聚酯密度
上述密度测量法可以在氯化锌/水溶液中或正庚烷/四氯化碳中,用密度柱进行。
一般,此种非结晶聚酯为一种聚对苯二甲酸乙二醇酯(PET)或聚对苯二甲酸丁二醇酯(PBT)。PET材料的特性粘度,按照于邻氯基苯酚中在25℃,5克/升浓度下测量的结果,最好是在0.5与1.1之间。
层压至金属上的这种非结晶聚酯膜是通过下述条件使一种含聚酯的膜层压到金属片上而形成的,即在层压成形过程中要让金属/聚酯层压件中的一或两面上的聚酯膜转变为非结晶(或无定形)形式。
最好使金属片的各主面都载有按以上规定的非结晶聚酯膜。不过,本发明的范围则包答,在一个主面上载有非结晶聚酯膜而在另一主面上载有不同热塑性聚酯膜的金属片。
上面涂敷聚合物膜的金属衬底一般取金属带形式,材料通常为钢或铝或其合金,典型的是包装工业中用的钢基或铝基制品。
上述带的厚度范围,典型的情况是钢从0.05至0.4毫米,而铝从0.02至0.4毫米;对于钢和铝的DWI罐来说,则一般是在0.25至0.35毫米。
钢可用锡镀层,最好通过常规的铬处理法钝化;或者可另行采用镀镍或锌的未镀锡之黑钢板或磷化处理的未镀锡之黑钢板,而在磷化处理之后还再好用铬酸盐液漂洗。
这方面较理想的钢成品乃是用电解法镀有铬的钢(ECCS),上面有着金属铬与氧化铬的双层结构。对这种钢来说,金属铬与氧化铬的面密度可以在广范围内变化。一般,金属铬的含量范围从0.01至0.20克/平方米,而氧化铬的从0.005至0.05克/平方米。ECCS通常是从包括含硫或含氟之催化剂的沉积系统中获取的。
所用的铝最好是那种3004型合金,它具有轧制(“滚轧”)的光洁度、或明亮的与也可用油浸的光洁度、或铬酸盐-磷酸盐处理以及也可经油浸的光洁度。举例来说,Alocrom A272便是铝带的一种合适的铬酸盐-磷酸盐处理体系。
有多种不同类型的聚酯膜可用来制备上述的金属聚合物层压件。适用于制备本发明之金属/聚合物层压件的聚酯材料为:
(i)浇注的热塑性聚酯,例如PET或PBT;
(ii)具有半结晶结构的双轴定向的聚酯膜,典型的有双轴定向的PET;
(iii)浇注的共挤出之复合聚酯膜;
(IV)如下的一种复合的共挤出之聚酯膜,它包括:
(A1)软化点低于200℃,熔点低于250℃但高于150℃的基本上为非结晶线型聚酯的内层,与
(A2)结晶度大于30%的双轴定向之线型聚酯外层。
采用共挤出的聚酯膜时,最好使用具有较薄内层A1与较厚外层A2的膜。
一般,外层A2是一种PET的均聚物。它的特性粘度对于双轴定向的膜最好介于0.5至1.1之间,更好是在0.6至0.7之间;而对于浇注的膜则最好大于0.9。
较薄的内层A1一般是一种基本上为非结晶性的线型共聚物,有80%的对苯二甲酸乙二醇酯和20%的间笨二甲酸乙二醇酯。另一方面,此内层也可以是一种由对酞酸以及乙二醇与环己烷-二甲醇之类网种二元醇衍生出的,基本上是非结晶的共聚多酯。
如有需要,则这种聚酯层也可以是着色的,例如采用合成石英或能给出彩色或白色外观之颜料(如二氧化钛)的防粘剂。对于能由这种层压件成形的啤酒罐之外表面,以二氧化钛来着色外层A2那是特别理想的。
这种共挤出膜的外层A2最好是PET。在内的无定形层A1则宜用一种线型的共聚多酯,例如一种由约80%的对苯二甲酸乙二醇酯与约20%的间苯二甲酸乙二醇酯组成的无定形共聚物。对酞酸与例如乙二醇和环己烷-二甲醇两种醇组成的共聚多酯,也适用作内部的无定形层A1。
当这种共挤出膜为双轴定向时,外结晶层A2的结晶度一般为50%,但要是减弱此结晶共聚物的双轴定向,则该结晶度可减至40%或更小。
双轴定向膜可按以下方式形成,即在高于聚合物的玻璃转变温度的温度下,按2.2至3.8倍朝前向拉伸之无定形的挤压成形的聚合物膜,且类似地以2.2至4.2倍朝横向拉伸这种膜。
本发明的层压金属片则按下述过程制备,其甲包括直接在金属片的一或网个主面上直接粘上一层包含有聚酯的膜,此层压成形的条件是,于层压过程中,在金属/聚合物层压件上的一或两面上的聚酯膜应转变成非结晶的或无定形的形式。
在制备本发明的这种金属/聚合物层压件的一种较佳方法中,是通过把金属片加热到高于聚酯膜熔点的一个温度T1,使聚酯的单层或两层膜粘合到金属片上,此温度T1需在将聚酯膜层压到金属片的过程中,使聚酯膜的外表面保持在其熔点之下,然后将此单层或两层膜层压到金属片上,再用可接方法把层压件重新加热到高于聚酯膜熔点的一个温度T2,经在此高温保持一段时间后,让此聚酯涂层的金属急冷至此种聚酯涂层树脂的玻璃转变温度之下。
在另一种较理想的方法中,这种一面或两面上的聚酯膜乃是包括一内层A1与一外层A2的复合膜,而这样的复合聚酯膜则是同时由下述过程粘合到金属片上的,此过程包括如下步骤:
(i)将金属加热到高于聚酯内层A1的软化点但低于外层A2的熔点的一温度T1;
(ii)将一面或两面上的膜层压到金属片上;
(iii)通过间接方法重新加热此层压件,使金属片达到聚酯膜或各聚酯膜熔点以上的一个温度;
(IV)在这样高的温度之上保持一段时间之后,将此聚酯涂层的金属加热到低于聚酯涂层树脂之玻璃转变点下的一个温度。
上述的复合聚酯膜最好是下述形式的共挤出的聚酯膜,包括着:
基本上是非结晶的线型聚酯内层A1,此种聚酯的软化点低于200℃,而熔点低于250℃但高于150℃,
一种聚酯的外层A2,此种聚酯的熔点高于220℃,
以上聚酯于邻氯基苯酚中在25℃,5克/升浓度下测得的特性粘度是在0.5至1.1之间。这样的金属/聚合物层压件最好来用感应加热装置于层压夹的下游重新加热,但也可采用红外加热。
在层压作业前金属所应加热到的温度需取决于待层压之膜的厚度及其化学性质。未涂层的金属则可以采用直接的或例如感应、红外、热空气或热辊等间接的加热方式处理。
140℃至350℃是适用于共挤出的双轴定向之PET膜的温度,130℃至250℃是适用于浇注共挤出之聚酯膜的温度,而260℃至350℃是适用于高结晶度的双轴定向之PFT单层膜的温度;另一方面,200℃至300℃则适用于低结晶度的PET膜,而对于铸型的PBT单层膜则需要高于180℃的温度。
一般,于层压夹下游用来重新加热层压件的温度,对于PET在270℃之上,而对于PBT为240℃。在大规模生产中,通常在重新加热作业与急冷之间只要求约2秒的停留时间。急冷是均匀与快速的,可通过把冷水幕导向到此层压带上来实现。为了防止聚酯结晶化,层压件应从190℃以上的温度急冷;而为了防止起泡,涂层应从低于熔点的温度下急冷。
本发明的层压件特别适用于成形DWI罐。从没有有机物涂层之金属片由常规的PWI作业来制造罐时包括以下步骤:
1.润滑镀锡的金属片或铝片;
2.由此金属片切割下一圆盘材料;
3.将此圆盘置于一圆形模具上,并用一圆柱形坯件夹持环使其就位;
4.将一冲头推过此模具,同时用上述坯件夹持环控制金属片的运动;
5.迫使冲头通过模具,直到整个金属片通过模具,而由此金属片形成一浅的杯形件,然后撤除冲头;
6.将此杯状件转移至一直径等于所需容器直径的冲头;
7.重新冲拔此杯状件,并迫使上述冲头与此杯状件通过一组内径逐渐变小的同心环,而使冲头与模具间的间隙小于杯状件的料厚;
8.将杯状件的壁部压薄并拉长;
9.约束住已成形的罐同时撤除冲头;
10.从罐壁顶部修整去余料;
11.洗罐以除去润滑剂,而在铝片情形需腐蚀除去金属屑;
12.将罐漂洗与干燥。
一般在洗涤后,铝质饮料罐可进行下述作业;
13.对表面进行化学处理;
14.于输送机炉子中漂洗并干燥;
15.在外部涂上底膜;
16.固化此底膜;
17.敷贴印刷装饰;
18.固化此装饰;
19.涂敷内涂层(用喷涂法);
20.固化此内涂层;
21.对罐进行颈缩与翻边处理,使颈径减至可与端盖匹配的值,并形成一供二重卷边用的凸缘。
另一方面,要是应用了经选择的外部底膜,则可用英国专利2101530、2145971、2141382、2010529、2141972与2147264号中所述的那种升华印刷法,来取代常规的印刷法。在底膜固化后,将含有可升华之染料的纸标签裹绕到罐上,并在此纸的搭接部分用少量的粘合剂固定住。使此罐通过高于染料升华点的温度的一座炉子,不需采用溶剂而进行转印。这种纸标签可通过空气喷射使之剥离,留下具有优异印刷质量的印有商标之罐。这是一种无溶剂的印刷法,基本上不会有大气排放物。
据本发明层压材料制成的DWI罐,在其成形后可用传统的溶剂基的印油进行装饰与印刷。
热固性聚酯涂层会迅速接受已升华的染料,而由纸标签转移染料到DWI罐上的方法则已工业化。发明人等业已发现,在金属片上的热塑性聚酯涂层会接受升华的染料。但是,由纸标签来获得高质量的装饰仅仅在PET涂层中保持有定向时才可成功。要是这种涂层是无定形的,则会由于它或是在层压过往中熔化,或是由于它是从非取向的膜获得,而使纸标签在升华阶段粘连到涂层上,以致损坏装饰。
由纸标签进行升华时,是在纸与涂层间形成紧密接触,并加热到160℃以上而通常是高达220℃的温度。在上述条件下,无定向的PET在其玻璃转变点(Tg)之上是相当软的,并将粘合到纸上。要是此涂层至少是它的外部保持双轴定向,则纸标签在升华过程中就不会粘连到聚酯上。此外部的有定向的材料在与纸标签接触时的热行为得到了改进,而且在染料升华过程中不会遇到它的有影响的玻璃转变温度。
上面描绘的染料转移到无定形涂层中的问题,似乎不可能使得无定形聚酯涂层之DWI罐上的染料升华。令人惊奇的是,我们已然发现,据本发明无定形聚酯涂层的层压件所形成的DWI罐,能够用标准的标签与升华条件通过升华来成功地进行装饰,
贴标签时最好应略加变动,要避免使标签与罐底有约2毫米的接触(如附图中的图7a中以“d”所指明的)。要是遵循上述方法,纸就不会粘连或接合到涂层上。一般地说,聚酯的无定形涂层在它的Tg之上是会与纸粘连的。但是,这种罐的成形作业则将定向引入到本发明层压件的聚酯涂层内,内而提高了有效的Tg。引入的定向量即使在罐壁的上部也是较少的,而且对于内外涂层又很不相同,这样,出奇的是,此种有益的效应能如此显著地阻止了纸的粘连。
本发明所述的层压件能够出色地加工成DWI罐,同时保持着优越的涂层整体性与粘合性。此外,这种涂层的罐能够用常规的印刷方法或通过染料升华法来装饰。
本发明的层压件还能用于制造其它包装部件,特别是非压热处理的包装部件。其它一些这类部件的典型例子是:
饮料产品用的多级冲拔罐,例如由0.21毫米的ECCS(强度为350牛顿/平方毫米)制造的,54毫米直径×70毫米高的罐;
划线的易升口之饮料罐端部,例如65毫米直径之钢或铝的端部;
椭圆罐的整体颈的椭圆端部;
涂料罐端部件,例如环、端部与盖;
气溶胶的端部件,例如锥形体与拱形顶盖。
本发明的主要优点是:
能切实可行地消除所有的溶剂排放物,因而改进了环境保护;
可用小型漂洗机代替大型的洗罐机,节省了洗涤试剂的成本;
由于削减了为完成这种罐所需通过炉子的次数而降低了能耗;
改进了外底的保护;
改进了复合底的轮廓;
能够不用制罐时所需的润滑剂;
能够减少工厂设备的尺寸与成本,同时降低操作劳务费用;
外部的印刷质料优越。
在整个这份说明书中,特性粘度是在5克/升浓度的邻氯基苯酚溶液中于25℃下测定的。
现在参看附图,对照下述例子,且仅仅以举例方式来进一步详述本发明,在附图中:
图1与2示意地表明了适用于实行本发明之方法的设备;
图3示明通过本发明之层压件截取的一个剖面,其中包括有层压到金属带M的单层聚合物膜A;
图4表明通过类似于图3的层压件截取的一个剖面,但具有层压到金属带M上的复合多层聚合物膜A;
图5表明通过类似于图4的层压件截取的一个剖面,但包含有层压到金属带M相对侧上热塑性聚合物的另一种膜耳;
图6表明由本发明之层压件形成的罐端;
图7a与7b分别表明由本发明之层压件形成的DWI罐与多级冲拔罐。
例1至例13
于图1或2所示意表明的设备中,通过层压方法制备了聚合物/金属/聚合物层压件。经红外或感应加热,通过加热器1将金属板予热到一适当的温度T1。此温度T1通常在140至150℃的范围内。聚酯膜A与B由送料辊1与4送入,层压到介于层压辊6、8间的已预热的金属片之两相对侧面上,此种层压辊的直径一般为100至400毫米。层压成形通常是在层压辊间应用200~400牛顿/米的夹力来进行的。
在这里的层压夹中,于金属片与聚合物膜间确立了紧密、均匀与无皱折的接触。在层压辊的下游,形成的层压件最好用感应加热器或通过红外加热,使之加热到聚合物膜A可与之相互作用且与金属片牢牢粘合的一个层压温度T2。此温度T2通常对于PBT在220至270℃的范围内,对于PET在260至300℃范围内。此金属/聚合物夹层件在温度T2或低于T2的一个温度下,保持一段通常不超过2秒的短暂时间,然后用水快速而均匀地急冷到低于膜中聚酯之玻璃转变点之下的一个温度,此温度对PET来说例如约为80℃。可以用任何常规的方式来进行这种急冷,但一般能按下述方式进行,即让此层压件通过图1所示的水槽12,或通过图1与图2所示的急冷水幂14。
通常,最好采用图1所示的按垂直方式进行层压的方法。金属带通过层压阶段的垂直运动常可允许采用较高的急冷速率,同时能给出更好和更均一的急冷效果。
图1还示明了据此图设备所阐明的方法中可能出现的典型温度分布。
根据表I中给出的材料,由红外或感应加热予热金属带,使金属带与聚合物膜通入一对夹辊,并使金属带的两立面同时与聚合物膜进行层压,这样便制成了层压件。将这样制备的层压件由红外或感应装置重新加热,于200℃以上保持两秒钟,然后用冷水快速与均匀地急冷。
                                  表I
                               层压件类型
  层压件类型   层压到金属片一侧上的膜(厚度)        金属片(厚度)  层压到金属片上另一侧的膜(厚度)
A     PET复合膜-类型I(18微米)      Al3004合金(0.317毫米)    PET复合膜-类型I(18微米)
B       PET单层膜(12微米)      Al3004合金(0.317毫米)      PET单层膜(12微米)
C      PET复合膜-类型III(15微米)      Al3004合金(0.317毫米)   PET复合膜-类型III(15微米)
D      PET复合膜-类型III(15微米)      Al3004合金(0.317毫米)    PET复合膜-类型I(18微米
E      PET复合膜-类型III(15微米)      Al3004合金(0.317毫米)   PET复合膜-类型II(25微米)
F        PBT单层膜(25微米)      Al3004合金(0.317毫米)    PET复合膜-类型I(18微米)
G      PET复合膜-类型III(15微米)      Al3004合金轧制光洁度(0.317毫米)   PET复合膜-类型III(15微米)
H      PP复合膜-类型I(25微米)      Al3004合金(0.317毫米)   PP复合膜-类型II(40微米)
I      PET复合膜-类型III(15微米)      Al3004合金(0.317毫米)    PP复合膜-类型I(25微米)
J      PET复合膜-类型III(15微米)      ECCS350牛顿/平方毫米(0.31毫米)  PET复合膜-类型III(15微米)
表II列出了若干例子,表明由在层压阶段前采用不同的金属温度T1和在层压阶段后采用各种重新加热温度T2下,所制备的这种层压件求得的有关结果。
                                   表II
   例  层压件材料  金属温度T1  金属温度T2 XRD(θ=13°)比值   峰值  可成形性
    1234567891011121314     AABBCCDEFGHIJJ      180180300280220220200200200220160150220220     240280280240280240280260260280270270280240      --00.29-0.29-------0.29     0002000020000000020000  优越优越优越差优越差-优越优越优越优越差差良好差
      表I的注释
PET复合膜-类型I:共挤出的铸塑PET复合膜,它具有:
(i)内层,是对酞酸与乙二醇和环己烷-二甲醇的一种共聚多脂;
(ii)外层,是一种特性粘度大于0.9的PET均聚物。
PET复合膜-类型II:同于PET复合膜-类型I,但在外层中另加有TiO2颜料。
PET复合膜-类型III:共挤出的双轴定向的PET复合膜,它具有
(i)内层,为对酞酸和异钛酸与乙二醇的共聚物;
(ii)外层,为特性粘度约在0.6至0.7的一种PET均聚物。
PET单层膜:特性粘度约为0.6至0.7的共挤出之双轴定向的单层膜。
PBT单层膜:铸塑的PBT单层膜。
PP复合膜-类型I:铸塑的共挤出之聚两烯复合膜,它具有
(i)马来酸酐接枝改性之聚丙烯的内层;
(ii)聚丙烯的外层。
PP复合膜-类型II:同于PP复合膜-类型I,但另有由TiO2与合成石英着色的外层。
Al3004合金:有过铬酸盐-磷酸盐表面处理的铝合金3004(Alocrom A272)。
Al3004合金-轧制的光洁度:冷孔后未清洗与未处理的铝合金3004。
表II中述及的层压件可成形性,是根据层压件按以下两个阶段经冲拔和薄壁拉深处理后之涂层的覆盖厚度来评定。
阶段I:从此层压件冲拔出一杯状件(高35毫米,直径86毫米),再经适当的润滑处理;
阶段II:经再冲拔和薄壁拉伸而形成罐体(直径65毫米,高130毫米)。
成形后,罐于水中漂洗;然后干燥。
评定涂层覆盖厚度时,是将它浸没于酸化硫酸铜中2分钟并目视检验铜的沉淀物,或者根据采用氯化钠溶液的“搪瓷检定”技术,电压为6.3伏而测量电流为毫安级。
由X射线衍射测定了层压温度对聚酯涂层结构与层压件成形性的影响。在这种测量方法中,是将膜或层压件置于一X射线衍射仪中。当平整的样品暴露在基本上是单色的X射线束下时,用合适的探测器测量了计数率。此样品与探测器相对于X射线束成一直线转动,保持着这样的几何结构,使得与通常粉末衍射扫描中的情形相同,让样品与X射线束间角度(θ)以及X射线束与探测器间的角度保持比值1∶2。这种数据给出了有关平行于样品表面之平面的信息。
在双轴定向的PET中,(1,0,0)面在θ=13°给出了高的计数率,但在无定形PET中则没有峰值。层压件与膜的θ=13°峰值高度比与此层压件中所保持的定向有关。我们的结果是作为θ=13°时峰值高度的比值与层压之PET涂层峰值高度而给出的。
根据英国专利2123746中的原理进行层压而保持定向的层压材料B(见例4),它的成形性很差,在制罐中会使金属升裂或使涂层严重碎裂。但当对层压材料B进行处理,消除其定向与结晶性时,如例3所示,则它就具有良好的成形性并在成形后给出优良的防护性。
类似地,双轴定向的共挤出之层压材料C与J要是为无定形时,同样能给出良好的成形性,而要是在此层压件中保持定向,则成形性就很差(将例5与例6,例13与例14进行对比)。
铸塑的未取向的PET或PBT涂层,在它们经层压时能有效地严生一种无定向的而不是结晶性的条件。结晶的条件例如可通过从重新加热的阶段缓慢冷却下来而产生。
例11与12表明,据英国专利2003415所述的那种聚丙烯材料形成的层压件,显示出很差的成形性。这类层压件已发现在罐的形成作业中导致金属断裂。
聚酯涂层的重新取向程度,可以通过检验由这种层压件与例5中之条件制的DWI罐来加以评定。取得的结果如下:
样品的测定部位       XRD(θ=13°)峰值
罐底—内涂层              <50
罐底—外涂层              <50
罐壁上端—内涂层           100
罐壁上端—外涂层           450
这些XRD数据肯定了此种层压片具有了无定形涂层,而且表明上部的罐部略有定向,且对于罐的外涂层尤其如此。
罐壁外涂层的下部2毫米则未受到罐成形时的显著影响,而基本上保持为无定形的。
由例1至例13之层压件形成的DWI罐的外壁,已用常规的染料升华工艺装饰。获得的装饰质置,当标签不与罐壁下部2毫米处即图7a的区域“d”接触时,可以看出是很优良的。

Claims (19)

1.一种具有金属片和粘合在其一或两个主表面上的复合聚酯膜的层压金属片,其中,复合聚酯膜具有:
(a)一具有200℃以下的软化点和250℃以下、150℃以上的熔点的单-聚酯内层;
(b)一具有220℃以上的熔点并由具有半结晶结构的双轴定向聚酯形成的聚酯外层;其中:
(c)聚酯膜基本上为非结晶体;
(d)聚酯膜的固有粘度在0.5-1.1之间;从而使层压金属片适于制造冲压和变薄拉深的罐。
2.根据权利要求1所述的层压金属片,其特征是:复合聚酯膜具有选自以下组成的聚酯或共聚酯:聚对苯二甲酸乙二醇酯;由乙二醇、对酞酸和第二种二元酸制成的共聚酯;和由对酞酸、乙二醇和第二种二元醇制成的共聚酯。
3.根据权利要求2所述的层压金属片,其特征在于,聚酯内层为乙二醇、80%克分子对酞酸和20%克分子间苯二酸的共聚酯。
4.根据权利要求3所述的层压金属片,其特征是:复合膜为加热粘合在金属上的双层挤压膜。
5.根据权利要求4所述的层压金属片,其特征是:聚酯外层为聚苯二酸乙二醇酯。
6.一种制造按照权利要求1-5中任一项的层压金属片的方法,其特征在于以下各制造工序:
(I)提供一金属片和一具有半结晶结构的双轴定向聚酯膜,
(II)将金属片加热到聚酯熔点以上的温度T1
(III)将聚酯膜在压力下和使其外表面保持在其熔点以下的条件下压到金属片上以形成初步层压件,
(IV)将此初步的层压件用间接的方法进行加热而使聚酯膜升到其熔点以上的温度T2,并在此高温下保持一定时间后以使聚脂转变为非结晶结构,
(V)通过令其穿过一水幕而将经加热的初步层压件迅速急冷到低于聚酯的玻璃转变点以下的某一温度以保持上述金属和非结晶聚酯层压件不变。
7.根据权利要求6所述的方法,其特征在于将无定形挤压聚合体沿其纵向拉伸2.2-3.8倍,沿其横向拉伸2.2-2.4倍而形成双轴定向聚酯膜。
8.根据权利要求6或7所述的方法,其特征在于在工序(IV)中,对初步的层压件进行感应加热。
9.根据权利要求6或7所述的方法,其特征在于双轴定向聚酯为聚对苯二甲酸乙二醇酯。
10.根据权利要求9所述的方法,其特征在于在工序(I)中将金属片加热到140℃-350℃以内的某一温度T1
11.根据权利要求6或7所述的方法,其特征在于聚酯膜含有二氧化钛一类频料。
12.根据权利要求6所述的方法,其特征在于以下各工序:
(a)提供一种具有一聚酯内层(A1)和一聚酯外层(A2)的复合膜,其中至少所述聚酯层中之一为具有半结晶结构的双轴定向聚酯;
(b)将金属片加热到内层软化点以上的某一温度T1
(c)将复合膜在压力下和使外表面层保持在其熔点以下的条件下压到经加热的金属片上以形成一初步的层压件;
(d)将初步的层压件用间接的方法加热到内外两层的熔点以上的某一温度T2以制成金属片和非结晶聚脂的层压件,并在此高温下保持一定时间后;
(e)通过令其穿过一水幕而迅即将层压件急冷到聚酯的玻璃转变点以下的某一温度以形成金属和聚酯层压件,层压件中的膜层为非结晶体。
13.根据权利要求12所述的方法,其特征在于双轴定向膜是通过将无定形挤压聚合体沿其纵向拉伸2.2-3.8倍,沿其横向拉伸2.2-4.2倍形成的。
14.根据权利要求12或13所述的方法,其特征在于工序(d)中,对层压件进行感应加热。
15.根据权利要求12或13所述的方法,其特征在于内层为选自以下组成的聚酯;由对酞酸和两种二元醇形成的共聚酯;由80%对酞酸以及20%间苯二酸和乙二醇形成的共聚酯。
16.根据权利要求12或13所述的方法,其特征在于内层较外层薄些。
17.根据权利要求12或13所述的方法,其特征在于外层为聚对苯二甲酸乙二醇酯。
18.根据权利要求17所述的方法,其特征在于聚对苯二甲酸乙二醇酯为双轴定向体并具有大于30%的结晶度。
19.根据权利要求12或13所述的方法,其特征在于外层聚酯含有二氧化钛一类颜料。
CN88107071A 1987-10-15 1988-10-12 层压金属片及其制造方法 Expired - Fee Related CN1045923C (zh)

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