CN110335536B - 一种可分层标签纸 - Google Patents

一种可分层标签纸 Download PDF

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CN110335536B
CN110335536B CN201910627821.0A CN201910627821A CN110335536B CN 110335536 B CN110335536 B CN 110335536B CN 201910627821 A CN201910627821 A CN 201910627821A CN 110335536 B CN110335536 B CN 110335536B
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钱昇阳
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Wuxi He Shuo Feng New Material Co ltd
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Abstract

本发明提供一种可分层标签纸,该标签纸包括五层,由上至下分为第1层至第5层,其中第1层为由聚丙烯和抗粘连剂组成,第2层和第3层由聚丙烯和碳酸钙组成,第4层为纯聚丙烯,第5层由丙烯‑降冰片烯共聚物和抗粘连母料组成,其特征在于:C2‑C3≥40%,优选C2‑C3≥50%,其中C2为第二层中碳酸钙占第二层的重量百分比,C3为第二层中碳酸钙占第二层的重量百分比,使用时将标签贴合于背贴物上后需要将标签撕下,材料即会自动于第2层和第3层间完成分离,实现材料的可分离。

Description

一种可分层标签纸
技术领域
本发明是一种可分层标签纸,主要用于防伪标签领域。
背景技术
目前,防伪标签,物流标签都需要一类复合材料,其是由多层材料贴合而成,当需要让某一层分离时即可撕去表层,同时露出底部印刷信息。这种材料被称为可分层材料。目前这类材料多使用印刷机或贴合机实现,例如印刷可以转移的图文油墨或通过低剥离强度的压敏胶黏剂贴合多层材料从而实现分离效果。但是这种实现方式均是在后续加工过程中完成,加工过程多,工艺复杂,成本较高。
CN201110459123公开了一种防伪标签:具有带有防伪功能的面材层(1);粘附于带有防伪功能的面材层上的紫外光固化胶膜(2);粘附于紫外光固化胶膜上的可透过紫外光的离型材料层(3)。其中,面材层选自RFID面材层、数码防伪面材层等,紫外光固化胶膜为粘合剂材料的层,粘合剂材料可以是环氧树脂、选自聚酯树脂、乙烯-乙酸乙烯酯树脂、(甲基)丙烯酸酯树脂中的热塑性树脂等。
CN92243695公开了一种标签,由覆盖层(1)、印刷层(2)、粘结层(3)、脱离层(4)和底层(5)组成,印刷层(2)、粘结层(3)、脱离层(4)和底层(5)依次层粘在覆盖层(1)一侧。其中,覆盖层(1)由透明材料制成,印刷层(2)为印刷油墨,粘结层(3)为聚氨酯类不干胶,脱离层(4)为聚乙烯蜡,底层(5)为纸。粘结层(3)与脱离层(4)之间的粘结力小于其它各层之间的粘结力。
CN01235737公开了光学变色防伪标贴由光变油墨图文层(1)、基体层(2)、压敏胶层(3)、离型纸层(4)构成,基体层的上面和/或下面是光变油墨图文层。当基体层的上面和下面都是印刷光变油墨图文层时,其中一面光变油墨图文层可用普通图文层代替。光变油墨图文层至少由一种光变油墨印刷而成,可以是各种光变油墨或和其它种类油墨的单色、多色、套色或叠色的丝印、凹印、凸印或胶印的印刷体。在基体层与其下面的光变油墨图文层之间可添加离型层(5)和连接层(6)。
但上述现有技术多层材料加工复杂,因此如果有一种广泛性的可分层标签纸提供,这将极大的简化加工过程,使工艺更加简单成本更加低廉。
发明内容
本发明的目的在于克服现有技术不足,提供一种可分层标签纸,其适合分离,表层经过涂布压敏胶黏剂后当材料与背贴物贴合后剥离材料后材料可以实现完成的分层,同时分离的部分处于半透明状态,可以清晰读取内部的信息。
本发明提供一种可分层标签纸,该标签纸包括五层,由上至下分为第1层至第5层,其中第1层为由聚丙烯和抗粘连剂组成,第2层和第3层由聚丙烯和碳酸钙组成,第4层为纯聚丙烯,第5层由丙烯-降冰片烯共聚物和抗粘连母料组成,其特征在于:C2-C3≥40%,优选C2-C3≥50%,其中C2为第二层中碳酸钙占第二层的重量百分比,C3为第二层中碳酸钙占第二层的重量百分比,使用时将标签贴合于背贴物上后需要将标签撕下,材料即会自动于第2层和第3层间完成分离,实现材料的可分离。
优选的,该标签纸可以由通常方法涂布胶粘剂或提供印刷信息,包括第1层表面印刷后涂布丙烯酸压敏胶黏剂、第5层表面涂布后经过印刷制成标签,优选在第5层正反两面同时印刷。
优选的,该可分层标签纸的生产方法包括,从上至下分别依次为第1层至第5层,现向第2-3层中加入一定量的碳酸钙,由于碳酸钙与聚丙烯树脂本身存在较差的相容度,因此在经过双向拉伸加工后,材料中的第2-3层被碳酸钙过度拉伸发泡产生了过量的空隙,从而出现了明显的强度下降。当上表层表面涂布完压敏胶黏剂粘合在背贴物表面时,即可在外力作用下实现完成的表层分离,在进行背胶后可以在较小的剥离强度下进行分离。分层发生于第2和第3层之间。
优选的,所述第1层的抗粘连剂为二氧化硅,聚丙烯优选为等规聚丙烯,其熔体流动速率为2-5g/10min;
优选的,第2层、第3层均由聚丙烯和碳酸钙组成,其碳酸钙浓度不同,是指第2层碳酸钙浓度为50-80%,优选为60%以上,第3层碳酸钙浓度为5-10%。分层剥离强度为120g以下,材料分离完整,残留面积比例小。
优选的,第5层采用丙烯-降冰片烯共聚物,其可以有效提高材料于涂层以及印刷油墨的附着强度,优选数均分子量为5-7万分子量,PDI为1.5-2.0。
优选的,标签纸总厚度范围为40-100um,各层厚度可以不同,比如第1层为0.5-1um,第2层为4-8um,第3层为30-90um,第4层为5-10um,第5层为2-3um。
优选的,聚丙烯或者丙烯共聚物的分子量为8-15万范围。
优选的,碳酸钙的种类为轻质碳酸钙,其粒径范围是2-4um,优选不经过活化改性处理。
优选的,上述标签纸的应用,其可以用于物流标签以及防伪标签领域。
由于碳酸钙与聚丙烯树脂并无良好的相容性,碳酸钙在材料中会阻断薄膜的拉伸进程,从而使连续的聚丙烯薄膜破裂成为细小的孔隙结构,从而降低材料自身的强度。利用这种不相容原理即可实现在外力作用下材料中的各层轻松分层。
采用上述结构的可分层标签纸,其可以改变原始复杂的分层标签工艺,同时能够保证材料的易剥离性能。客户可以在正反两面同时印刷,由于珠光标签纸具备良好的遮盖性,背面反印的信息无法被正常读取,而正面的信息可以被良好读取。后续加工时将可剥离表层表面均匀涂布压敏胶黏剂,随后当材料背贴于背贴物时,底层文字不可见,当需要揭去表层时,即可将表层撕下,随后露出的部分即为底层反印信息。
附图说明
下面结合附图和实施例对本发明进一步说明。
图1是本发明可分层标签纸的结构示意图。
图2是可分层标签纸的生产工艺流程图。
具体实施方式
可分层标签纸采用双向拉伸工艺生产,生产是采用五层工艺加工工艺,生产。其产品结构如图1所示。
实施例1
生产过程为第1层使用等规度97%的聚丙烯树脂混合1%抗粘连母料,生产厚度为0.5um,第2层50%聚丙烯树脂混合50%轻质碳酸钙,碳酸钙粒径2um,厚度为4um,第3层为聚丙烯树脂混合10%轻质碳酸钙,碳酸钙粒径2um,厚度为30um,第4层为纯聚丙烯树脂,厚度为5um,第5层为分子量为5.5万,PDI为1.5的丙烯-降冰片烯共聚物混合1%抗粘连母料,厚度为2um,5层的树脂按照相应配方由5台不同的挤出机塑化混合挤出后经管道与模头内复合,整体流延成片,随后经过纵向拉伸,横向拉伸,牵引电晕后进入收卷,收卷幅宽为7.5米,随后将母卷分切成目标的宽度即完成生产过程。
实施例2-10,除去下述区别外与实施例1相同,区别仅在于第2层与第3层的碳酸钙浓度不同,具体浓度和相应参数表征如表1所示。
剥离力测试标准:为剥离力采用将材料背涂压敏不干胶水,粘贴于标准钢板上,撕下表层后对其剥离力进行测试。剥离力测试按照标准方法进行,行程100mm,取中间60%的力求算平均值,其平均力值大小即为其剥离力。
残留面积比例为剥离后残留在第3层上的第2层的面积占第3层面积的比例,具体为判断剥离后的部分其是否完完整,剥离后材料对其残余部分进行测算,估算残留在第3层上的第2层的面积占第3层面积的比例。
材料密度指标签纸密度,芯层碳酸钙浓度越高,其密度越低。主要与芯层碳酸钙浓度有关,与次表层的碳酸钙浓度关系较小。碳酸钙在材料中的主要作用是阻断拉伸的进程,从而降低材料的密度。
表1实施例1-10数据表征
Figure BDA0002126616880000041
Figure BDA0002126616880000051
实施例1-10说明,当C2-C3≥40%时,由于第2层碳酸钙含量高,剥离力相对较小以及残留面积比例好,当C2-C3≥50%,C2优选范围60-70%,C3优选范围5-10%,剥离力更小,更易剥离,且残留小。
但如果C3为0%时,即第3层不加入碳酸钙,发现剥离力增大以及材料密度增大,可能由于第3层不含有碳酸钙,导致第2层和第3层结合紧密,剥离力较大,材料密度也增大。
实施例11-19,除去下述区别外与实施例2相同,区别仅在于第5层采用的聚合物种类和分子量不同,具体见表2所示。
表2实施例11-19数据表征
Figure BDA0002126616880000052
Figure BDA0002126616880000061
其中油墨测试UV凸版油墨结合力评分测试方法为:UV油墨滚涂在材料表面UV固化,用3M810胶带粘贴后快速撕下,其中完全不掉为5分,轻微点状脱落为4分,小片脱落为3分,脱落面积超过50%为2分,脱落面积超过90%为1分,完全脱落为0分。
以上实施例10-19说明,当第5层聚合物为丙烯-降冰片烯共聚物时,在油墨测试UV凸版油墨结合力评分性能方面优于常见的聚丙烯、聚乙烯、乙丙共聚物或者EPDM等;当第5层聚合物分子量为5-7万,PDI为1.5-2时,油墨测试UV凸版油墨结合力评分效果更好。
另外,研究了填料种类、粒径以及是否经过活化对标签纸的影响,具体如下:
Figure BDA0002126616880000062
Figure BDA0002126616880000071
实施例20-23和实施例1说明,碳酸钙种类为轻质碳酸钙时效果更好,其粒径范围为2-4um,并且出乎意料的是,本领域中一般认为经过活化改性,如偶联剂改性,会获得更好的技术效果,但经过实验,发现本申请中如实施例23所示,采用KH550改性过的轻质碳酸钙,其剥离力效果要劣于没有改性的实施例2。
另外,根据实施例24和25,选择碳酸钙之外的填料如二氧化钛或滑石粉,剥离力和残留面积比例都明显劣于实施例2中采用碳酸钙的情况,可能是填料种类对分离情况有影响,目前是碳酸钙效果最好。

Claims (13)

1.一种可分层标签纸,该标签纸包括五层,由上至下分为第1层至第5层,其中第1层为由聚丙烯和抗粘连剂组成,第2层和第3层由聚丙烯和碳酸钙组成,第4层为纯聚丙烯,第5层由丙烯-降冰片烯共聚物和抗粘连母料组成,其特征在于:C2-C3≥40%,其中C2为第2层中碳酸钙占第2层的重量百分比,C3为第3层中碳酸钙占第3层的重量百分比,使用时将标签贴合于背贴物上后需要将标签撕下,材料即会自动于第2层和第3层间完成分离,实现材料的可分离。
2.根据权利要求1所述的标签纸,可以由通常方法涂布胶粘剂或提供印刷信息,包括第1层表面印刷后涂布丙烯酸压敏胶黏剂、第5层表面涂布后经过印刷制成标签。
3.根据权利要求2所述的标签纸,在第5层正反两面同时印刷。
4.根据权利要求1-3之一所述的标签纸,其可分层标签纸的生产方法包括,从上至下分别依次为第1层至第5层,现向第2-3层中加入一定量的碳酸钙,由于碳酸钙与聚丙烯树脂本身存在较差的相容度,因此在经过双向拉伸加工后,材料中的第2-3层被碳酸钙过度拉伸发泡产生了过量的空隙,从而出现了明显的强度下降,当上表层表面涂布完压敏胶黏剂粘合在背贴物表面时,即可在外力作用下实现完成的表层分离,在进行背胶后可以在较小的剥离强度下进行分离,分层发生于第2和第3层之间。
5.根据权利要求1-3之一所述的标签纸,所述第1层的抗粘连剂为二氧化硅,聚丙烯为等规聚丙烯,其熔体流动速率为2-5g/10min。
6.根据权利要求1-3之一所述的标签纸,第2层、第3层均由聚丙烯和碳酸钙组成,第2层碳酸钙重量百分比为50-70%,第3层碳酸钙重量百分比为5-10%。
7.根据权利要求1-3之一所述的标签纸,第5层采用丙烯-降冰片烯共聚物,其可以有效提高材料于涂层以及印刷油墨的附着强度,数均分子量为5万-7万分子量,PDI为1.5-2.0。
8.根据权利要求1-3之一所述的标签纸,标签纸总厚度范围为40-100um,各层厚度可以不同。
9.根据权利要求8所述的标签纸,第1层为0.5-1um,第2层为4-8um,第3层为30-90um,第4层为5-10um,第5层为2-3um。
10.根据权利要求1-3之一所述的标签纸,聚丙烯的重均分子量为8-15万。
11.根据权利要求1-3之一所述的标签纸,碳酸钙的种类为轻质碳酸钙,其粒径范围是2-4um。
12.根据权利要求11所述的标签纸,碳酸钙不经过活化改性处理。
13.权利要求1-12之一所述的标签纸的应用,用于物流标签以及防伪标签领域。
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