CN110669436A - 一种大幅提升印刷基材印刷面表面张力的方法 - Google Patents

一种大幅提升印刷基材印刷面表面张力的方法 Download PDF

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CN110669436A
CN110669436A CN201910962503.XA CN201910962503A CN110669436A CN 110669436 A CN110669436 A CN 110669436A CN 201910962503 A CN201910962503 A CN 201910962503A CN 110669436 A CN110669436 A CN 110669436A
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张东亮
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GUANGDONG XINRUI NEW MATERIAL TECHNOLOGY Co Ltd
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Abstract

本发明提供了一种能够大幅提升印刷基材印刷面的表面张力的方法,该方法是在印刷基材的印刷面采用凹版网纹陶瓷辊涂布一达因增强层,该达因增强层是由重量组分为高聚树脂70‑90份、多元异氰酸酯10‑20份、助剂6‑8份和溶剂280‑320份构成的清漆层,其中高聚树脂是带有羟基、羧基和/或亚胺基的环烷丙酸酯,凹版网纹陶瓷辊的网纹孔为正六棱台形且网纹的排列角度为60°,网穴深度为50‑52μm、宽度为40一45μm,目数为250目;印刷基材为转移纸(膜)或复合纸。本发明通过在印刷基材的印刷面涂布一达因增强层来实现表面张力的大幅提升,工艺简单,经本发明方法处理的印刷基材,其印刷面的表面张力能够达到52达因值以上,且各位置点的达因值均匀、稳定,表面达因值能够保持1年的时间。

Description

一种大幅提升印刷基材印刷面表面张力的方法
技术领域
本发明涉及印刷基材,尤其涉及一种印刷基材表面的处理方法,更具体是涉及一种能够大幅提升印刷基材印刷面的表面张力的方法。
背景技术
转移纸(膜)或复合纸等印刷基材,其印刷面通常为模压树脂层、镀铝层或薄膜层,由于模压树脂层、镀铝层或薄膜层皆为非极性材料,对油墨的吸附性差,通常都必须对印刷面进行表面处理。为了提高印刷基材的印刷加工适性,最常用的方法是进行电晕处理,目前市场上流通应用的转移纸(膜)或复合纸,其印刷面经过电晕处理后的表面张力最大在38-42达因值之间(而BOPP膜经过电晕处理后其表面张力也小于38达因值),这种表面张力只能适应于普通速度下的胶印、凹版印刷和柔版印刷,对于600米/分钟的高速印刷,这种表面张力就完全无法适应,这是因为低达因值的印刷面,在高速印刷过程中表面吸附油墨性能会变差、无法达到油墨正常吸附的效果,从而造成印刷图案不完整,另外,由于表面吸附油墨性能变差,会造成印刷后油墨容易反粘在设备的导辊、印版上,导致出现经常停机、洗版的现象,大大影响生产。因此,如何提高转移纸(膜)或复合纸等印刷基材印刷面的表面张力以适应高速印刷的要求,是目前迫切需要解决的问题。
发明内容
为解决以上存在的问题,本发明的目的是提供一种大幅提升印刷基材印刷面表面张力的方法。
为实现以上目的,本发明的大幅提升印刷基材印刷面表面张力的方法,是在印刷基材的印刷面采用凹版网纹陶瓷辊涂布一达因增强层,该达因增强层是由重量组分为高聚树脂70-90份、多元异氰酸酯10-20份、助剂6-8份和溶剂280-320份构成的清漆层,其中高聚树脂是带有羟基、羧基和/或亚胺基的环烷丙酸酯,凹版网纹陶瓷辊的网纹孔为正六棱台形且网纹的排列角度为60°,网穴深度为50-52μm、宽度为40一45μm,目数为250目;印刷基材为转移纸(膜)或复合纸。
优选的,上述方法中,所述带有羟基、羧基和/或亚胺基的环烷丙酸酯优选环丙烷酸亚胺氰基羟基酯,多元异氰酸酯优选异氰酸六甲氧烷,助剂为流平剂,溶剂为无水乙醇和水以2︰1混合。
优选的,上述方法中,所述达因增强层涂料的上机粘度控制在19一20秒,湿涂布量为4一5g/m2,涂层烘干温度为80一130℃,涂布机速为90一100米/分钟。
优选的,上述方法中,所述转移纸(膜)的印刷面为转移到原纸或基膜上的功能层,功能层优选镀铝层、带有镭射效果的树脂层或介质层。
优选的,上述方法中,所述达因增强层是在功能层转移到原纸或基膜后进行连线涂布,产品收卷时的张力控制在25一30公斤。
优选的,上述方法中,所述复合纸的印刷面为与原纸复合的功能膜的膜面,功能膜优选PP膜、PE膜、BOPP膜、光银膜或镭射膜。
优选的,上述方法中,所述复合纸的印刷面为与原纸复合的镀铝面。
优选的,上述方法中,所述达因增强层是在原纸与功能膜或镀铝面的复合后连线涂布,产品收卷时的张力控制在30一35公斤。
本发明申请文件中所述的粘度是指采用察恩杯2#杯,在室内温度28℃、湿度40%的条件下测得的数据。
本发明的大幅提升印刷基材印刷面表面张力的方法,具有如下的优点:
1、采用带有羟基、羧基和/或亚胺基的环烷丙酸酯和多元异氰酸酯作为主树脂在基材的印刷面形成一清漆层,利用羟基、羧基、亚胺基等极性基团具有的活性、以及异氰酸酯可与纸或膜牢固结合的特点,使得该涂层不仅能与印刷基材的印刷面具有良好的结合,而且对凹印、柔印、胶印、丝印的油墨具有优异的吸附性能,在机速达到600米/分钟的凹版、胶印、柔版印刷工艺中,印品能够保持转印性能优良、油墨流平性能良好、印品图案清晰、亮丽。
2、涂层采用网纹孔为正六棱台的凹版网纹陶瓷辊进行涂布,涂料转移更彻底、流平性更好、均匀性更佳,且网纹辊不容易塞版,从而保证整个涂布面达因数的均匀性和一致性。
3、相比于传统方式的电晕处理,能够延长产品表面达因值的稳定周期,降低产品表面达因值的衷减比,使产品的表面张力更具耐久性,同时对产品储存环境条件要求也相对低。
4、经本发明方法处理的印刷基材,其印刷面的表面张力能够达到52达因值以上,且各位置点的达因值均匀、稳定,表面达因值能够保持1年的时间。
附图说明
图1是本发明达因增强层涂布时采用的凹版网纹陶瓷辊辊面的结构示意图。
图2是含有达因增强层的转移纸的结构示意图。
图3是含有达因增强层的复合膜的结构示意图。
图4是含有达因增强层的复合纸的结构示意图。
具体实施方式
下面是本发明提高印刷基材印刷面表面张力的方法几个具体实施例,这些实施例只是对本发明提高印刷面表面张力的具体说明,并非用以限制本发明的保护范围。
实施例1(转移纸)
如图2所示,本发明的含有达因增强层的转移纸,从下至上依次包括原纸1、胶粘层2、镀铝层3、模压层4和达因增强层5;其制备方法包括如下步骤:
(1)、达因增强层涂料的制备:按重量份将水性环丙烷酸亚胺氰基羟基酯︰异氰酸六甲氧烷︰水性流平剂︰乙醇︰水=80︰15︰5︰200︰100的比例混合均匀,再用混合溶剂(乙醇︰水=2︰1混合)将涂料的粘度调至19一20秒之间,待用;
(2)、转印膜的制备:在转移基膜(PET膜)上涂覆带有离型效果的树脂层;对树脂层进行模压,使其具有镭射效果;在模压层上真空镀铝,形成铝层;在铝层上涂覆胶粘剂,烘干后待用(这些都是采用现有的工艺);
(3)、在复合机上先将原纸与步骤(2)制得的转印膜贴合在一起,然后联线剥离转移基膜,再采用凹版网纹陶瓷辊将步骤(1)制得的涂料在剥离基膜后的镭射层上涂布形成一达因增强层,涂布时湿涂量控制在4一5克/平方米、涂布机速控制在90米/分钟,然后经过80一100℃的烘箱(采用阶梯式设置)烘干,再经冷却辊冷却后收卷,收卷张力控制在25一30公斤;凹版网纹陶瓷辊为正六棱台形且网纹的排列角度为60°,如图1所示,网穴深度为50-52μm、宽度为40一45μm(对边宽度),目数为250目。
上述转移纸经取样检测达因值,测得镭射层上的达因值达到52达因以上,完全能适用高速印刷的需求。
上述的原纸也可以是薄膜,转印膜也可以是光银转印膜、镭射转印膜或介质转印膜,剥离基膜后的转移涂层可以是镀铝层、镭射层或介质层。
实施例2(复合膜)
如图3所示,本发明的含有达因增强层的复合膜,从下至上依次包括基膜层6、模压层4、镀铝层3和达因增强层5;其制备方法包括如下步骤:
(1)、达因增强层涂料的制备:按重量份将水性环丙烷酸亚胺氰基羟基酯︰异氰酸六甲氧烷︰水性流平剂︰乙醇︰水=80︰15︰5︰200︰100的比例混合均匀,再用混合溶剂(乙醇︰水=2︰1混合)将涂料的粘度调至19一20秒之间,待用;
(2)、转移膜的制备:在基膜上涂覆透明树脂层,对树脂层进行模压,使其具有镭射效果,在模压层上真空镀铝,形成铝层(均采用现有工艺);
(3)、采用凹版网纹陶瓷辊将步骤(1)制得的涂料涂布在步骤(2)制得的转移膜的铝层上形成一达因增强层,涂布时湿涂量控制在4一5克/平方米、涂布机速控制在90米/分钟,然后经过80一100℃的烘箱(采用阶梯式设置)烘干,再经冷却辊冷却后收卷,收卷张力控制在25一30公斤;凹版网纹陶瓷辊为正六棱台形且网纹的排列角度为60°,如图1所示,网穴深度为50-52μm、宽度为40一45μm,目数为250目。
上述复合膜经取样检测达因值,测得镀铝层上的达因值达到52达因以上,完全能适用高速印刷的需求。
上述复合膜可以直接在达因增强层上进行印刷后作为包装材料使用,也可通过基膜与原纸复合后构成含有达因增强层的复合纸。
实施例3
如图4所示,本发明的含有达因增强层的复合纸,从下至上依次包括原纸1、胶粘层2、镀铝层3、基膜层6和达因增强层5;其制备方法包括如下步骤:
(1)、达因增强层涂料的制备:按重量份将水性环丙烷酸亚胺氰基羟基酯︰异氰酸六甲氧烷︰水性流平剂︰乙醇︰水=80︰15︰5︰200︰100的比例混合均匀,再用混合溶剂(乙醇︰水=2︰1混合)将涂料的粘度调至19一20秒之间,待用;
(2)、在复合机上先将原纸与经过加工的光银膜贴合在一起(银面与纸贴合),再采用凹版网纹陶瓷辊将步骤(1)制得的涂料涂布在膜层上形成一达因增强层,涂布时湿涂量控制在4一5克/平方米、涂布机速控制在90-100米/分钟,然后经过80一130℃的烘箱(采用阶梯式设置)烘干,再经冷却辊冷却后收卷,收卷张力控制在20一35公斤;凹版网纹陶瓷辊为正六棱台形且网纹的排列角度为60°,如图1所示,网穴深度为50-52μm、宽度为40一45μm,目数为250目。
上述复合纸经取样检测达因值,测得膜层上的达因值达到52达因以上,完全能适用高速印刷的需求。
上述的光银膜也可以是PP膜、PE膜、BOPP膜或镭射膜,涂层可以涂布在膜层或镭射层。

Claims (8)

1.一种大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述方法是在印刷基材的印刷面采用凹版网纹陶瓷辊涂布一达因增强层,该达因增强层是由重量组分为高聚树脂70-90份、多元异氰酸酯10-20份、助剂6-8份和溶剂280-320份构成的清漆层,其中高聚树脂是带有羟基、羧基和/或亚胺基的环烷丙酸酯,凹版网纹陶瓷辊的网纹孔为正六棱台形且网纹的排列角度为60°,网穴深度为50-52μm、宽度为40一45μm,目数为250目;印刷基材为转移纸(膜)或复合纸。
2.根据权利要求1所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述带有羟基、羧基和/或亚胺基的环烷丙酸酯为环丙烷酸亚胺氰基羟基酯,多元异氰酸酯为异氰酸六甲氧烷,助剂为流平剂,溶剂为无水乙醇和水以2︰1混合。
3.根据权利要求1或2所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:其特征在于:所述达因增强层涂料的上机粘度控制在19一20秒,湿涂布量为4一5g/m2,涂层烘干温度为80一130℃,涂布机速为90一100米/分钟。
4.根据权利要求3所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述转移纸(膜)的印刷面为转移到原纸或基膜上的功能层,功能层为镀铝层、带有镭射效果的树脂层或介质层。
5.根据权利要求4所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述达因增强层是在功能层转移到原纸或基膜后进行连线涂布,产品收卷时的张力控制在25一30公斤。
6.根据权利要求3所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述复合纸的印刷面为与原纸复合的功能膜的膜面,功能膜为选PP膜、PE膜、BOPP膜、光银膜或镭射膜。
7.根据权利要求3所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述复合纸的印刷面为与原纸复合的镀铝面。
8.根据权利要求6或7所述的大幅提高印刷基材印刷面表面张力的方法,其特征在于:所述达因增强层是在原纸与功能膜或镀铝面的复合后连线涂布,产品收卷时的张力控制在30一35公斤。
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