CN1068278C - 广告灯箱用膜 - Google Patents

广告灯箱用膜 Download PDF

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CN1068278C
CN1068278C CN95115276A CN95115276A CN1068278C CN 1068278 C CN1068278 C CN 1068278C CN 95115276 A CN95115276 A CN 95115276A CN 95115276 A CN95115276 A CN 95115276A CN 1068278 C CN1068278 C CN 1068278C
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朝妻明光
小山广
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Abstract

描述了一种用于广告灯箱的薄膜。该薄膜为由含有白色无机材料细微粉的拉伸树脂膜制成的半透明膜。该半透明薄膜满足下列(1)至(4)项要求:(1)不透明度为40%至70%;(2)白度为80%至100%;(3)全光束平均反射率为30%至60;(4)全光束平均透过率为30%至70%。

Description

广告灯箱用膜
本发明涉及出售诸如汉堡包、炸鸡、法式土豆、三明治、生鱼片冷饭团、炒面等食品的快餐店用以显示菜单、价格等的广告箱灯上使用的薄膜。
以前,典型的广告箱灯是由在其上用油漆写上店名、电话号码等的毛玻璃或半透明的高抗冲聚苯乙烯平板(HIPS板)构成的,当平板被位于另一侧的电灯泡或日光灯管照亮时,这些写于平板上的文字(及图案)就可以吸引旅客和顾客的注意。
然而,在商店或地下通道应用广告箱灯来为快餐店、百货店、艺术博物馆等做广告时需要有多彩印刷的美观的广告面。因此,就用半透明的描图纸来代替毛玻璃或半透明的HIPS板。通常的做法是。这种半透明的描图纸经过照相凹版彩印、胶版彩印、网板彩印等后,再用光源照射该纸就形成了广告箱灯。
这种广告箱灯的半透明描图纸现已采用不透明度为15-30%(用JIS P 8138方法测定)的合成描图纸(它是由含白色无机材料如碳酸钙和煅烧粘土的细微粉的拉伸热塑性树脂膜制成),因为这种纸的抗弯强度高、可印刷性优良,并且印刷外观也漂亮。
例如,JP-A-1-156062(这里的“JP-A”表示为“未审查的公开日本专利申请”)公开的一种广告灯箱用纸是包含由75-95%(重量)聚丙烯树脂和5-25%(重量)高密度聚乙烯制成的双轴拉伸树脂膜作为基层(A)的半透明聚丙烯树脂多层复合膜。基层(A)的至少一边层压由(a)80-95%(重量)聚丙烯树脂,(b)0-10%(重量)选自高密度聚乙烯、乙烯-醋酸乙烯共聚物和低密度聚乙烯的烯烃树脂和(c)5-20%(重量)无机材料细微粉组成的烯烃树脂组合物所制成的薄膜(B)和丙烯均聚物或丙烯无规共聚物制成的薄膜(C)的单轴拉伸层压膜,其排列的顺序是应使得后者丙烯均聚物或丙烯无规共聚物的单轴拉伸膜成为表面层。该复合膜不透明度为3-25%(按JIS P-8138 测定),光泽度65-95%(按JIS P-8142测定表面层(C)一边)。
上述描图纸的优点在于它的不透明度为3-25%,白度为70-80%,因而从其背侧看具有很好的透光性,因此可以明亮地展示印刷的文字和图案。但是,某些用户,特别是要求用肝褐色、橙色、棕色、浅黄棕色和黑色来印刷火腿、汉堡包、炸鱼丸等食品展示的快餐店则希望图形展示应该显出更亮丽的色泽和更精细的轮廓。
为了使印出的文字和图案轮廓比用这种描图纸得到的更为清晰,可以使用一种不透明度不小于90%及白度不小于80%的通用型不透明合成纸,例如YUPO FPG(Oji Yuka Goseishi公司生产的合成纸的商品名)。但是,因为这种不透明合成纸的不透明度不小于90%,并且全光束平均透过度低至8-80%,所以从背侧通过的光较少,当用作广告灯箱的广告纸时与描图纸相比,文字和图案的亮度较低,顾客和旅客观看时比较暗淡。
本发明的目的是提供一种广告灯箱用薄膜,即使这种薄膜的不透明度比常规的描图纸高也不致降低从其背面的透光性。
本发明提供的广告灯箱薄膜是由含白色无机材料细微粉的拉伸树脂薄膜制成的半透明薄膜,这种半透明薄膜满足下列(1)至(4)项要求:
(1)不透明度为40%至70%;
(2)白度为80%至100%;
(3)全光束平均反射率为30%至60%;
(4)全光束平均透过率为30%至70%。
附图是一个广告灯箱的部分剖视图,各数字代表意义如下:
1:半透明薄膜
2,2′.印刷的字图
3:框架
4:光源
5:广告灯箱
用反光性的白色粉末如二氧化钛和氧化锌作为白色无机材料细微粉加到薄膜中可使薄膜的不透明性增加,但透光率仅略有下降,这使得印刷的文字和图案更为清晰,因而灯光照射的文字和图案亮度更高。
本发明的用于广告灯箱的半透明膜为含有白色无机材料细微粉的拉伸树脂膜。该半透明的膜满足下面(1)至(4)项要求:
(1)不透明度为40%至70%(按JIS P-8138测定);
(2)白度为80%至100%(按JIS L-1015测定);
(3)全光束平均反射率为30%至60%(按JIS K-7105-
1981测定);
(4)全光束平均透过率为30%至70%(按JIS K-7105-
1981测定)。
满足这些要求的半透明膜可以通过控制白色无机材料细微粉的种类、反光性白色粉末的种类、粉末的数量、热塑性树脂的种类、拉伸温度、拉伸比和膜的厚度来制备。
这种半透明膜的实例是一种层合膜,它包含一个含0-40%(重量)白色无机材料细微粉的双轴拉伸热塑性树脂膜作基层(A)和一个含0.3-5%(重量)反光性白色粉末如二氧化钛和氧化锌和10至60%重量选自碳酸钙、煅烧粘土、硅石和沸石的白色无机材料细微粉的单轴拉伸热塑性树脂膜层压在基层(A)的两侧作为层(B)和层(B′),其中白色无机材料细微粉和反光性白粉末的置是以含有该材料的热塑性树脂膜的重量为基准计算的。
反光性白粉末的平均颗粒直径为0.5至2微米。
作为要加到基层(A)或层(B,B′)中的白色无机材料细微粉,可以使用平均颗粒直径为0.03至16微米的重质碳酸钙、煅烧硅藻土、粘土、硅石、滑石粉、沸石、二氧化钛、硫酸钡、氧化锌等。
如上所述,白色反光粉末和白色无机材料细微粉是联合加到层B、B′中的。特别是从经济和耐风蚀能力观点看,优选的是组合使用二氧化钛和碳酸钙或二氧化钛和煅烧粘土。
作为要用在热塑性树脂膜A、B或B′中的热塑性树脂,可以使用熔点不低于132℃,最好为164-250℃的热塑性树脂。这种热塑性树脂的实例有丙烯均聚物、聚丙烯树脂如丙烯-乙烯共聚物、丙烯-丁烯-1共聚物、丙烯-乙烯-丁烯-1共聚物和丙烯-4-甲基戊烯-1共聚物,烯烃树脂如密度为0.945-0.970克/厘米3的高密度聚乙烯和聚(4-甲基-戊烯-1)树脂,聚酯如聚对苯二甲酸乙二醇酯和聚对苯二甲酸丁二醇酯,聚酰胺如尼龙6和尼龙6,6,聚苯硫醚和聚碳酸酯。
这些共聚物可为无规共聚物或嵌段共聚物。
这些熔点不低于132℃的热塑性树脂可以和用量为3-15%(重量)的熔点为80-126℃的低熔点树脂如密度为0.880-0.944克/厘米3的低密度聚乙烯、线型低密度聚乙烯、乙烯-醋酸乙烯酯共聚物、乙烯-丙烯酸酯共聚物、乙烯-甲基丙烯酯共聚物与金属(例如Li、Na、K、Zn、Al)形成的盐、聚苯乙烯和石油树脂进行共混以利于其拉伸。
膜的拉伸是通过辊筒、拉辐机、卷绕机等之间的园周速度不同实现的。轴向的拉伸比可为3.5至7,横向拉伸比可为3.5至12。拉伸温度要能使得到的半透明膜具有40-70%的不透明度(按JISP-8138方法测定)、30-70%的全光束平均透过率(按JIS K-7105-1981方法测定)和30-60%的全光束平均反射率(按JIS K-7105-1981方法测定)。例如,如果热塑性树脂是丙烯均聚物,则轴向拉伸可以在比该树脂熔点低5-15℃的温度下进行,而横向拉伸可以在比该树脂熔点高2-15℃的温度下进行。
该半透明膜存在许多微孔,所以这种膜是微孔膜。按下式的计算,该半透明膜的孔隙率为0-15%:其中ρo代表拉伸前膜的密度,ρ代表拉伸后膜的密度。
该半透明膜可以是双轴拉伸的单层膜。从膜的弯曲强度和两表面层的表面强度来看,基层最好是双轴拉伸膜,而两表面层最好是单轴拉伸膜。
半透明膜的厚度为50-150微米,最好为60-150微米。如果用层状结构,则基层的厚度可占层合膜厚度的40-80%。
该半透明膜的物理性能如下:
(1)不透明度为40-70%,最好为45-65%;
(2)白度为80-100%,最好为83-90%;
(3)全光束平均反射率为30-60%,最好为35-58%;
(4)全光束平均透过率为30-70%,最好为40-60%,其中所有的性能均按前面所述的JIS标准测定(本文中的这些物理性能均如此)。
如果不透明度超过上述定义的范围,或全光束平均透过率和全光束平均反射率低于上述范围,则广告灯箱上印的文字和图案看起来就显得暗淡。
相反,如果不透明度和白度低于上述范围,或全光束平均透过率和全光束平均反射率超过上述范围,则黄色、棕色、浅黄棕色或浅棕色印出的文字和图案的轮廓就不明亮。
广告灯箱5,例如可用如下的方法制成。即,用照相凹版印刷法、网版印刷法、胶板印刷法等将产品名(菜单或简介)、价格、商店名称、图案等2,2′印在半透明膜1两边的任一面上。印好的半透明膜1固定在框架3上,使得光源4,如荧光灯管、电灯泡、水银灯或氙弧灯发射的光能将其照亮。
在半透明膜双面印刷的情况,正象图2是印在半透明膜的外表面,而另一个表面2′上是用与半透明膜外表面的印版相反的负印版印刷的。
在下面的实例中,将对本发明进一步进行描述。
含无机材料细微粉的拉伸树脂膜的制备
制备实例1
(1)92份(重量)熔体指数(MI)为0.8克/10分钟(熔点164℃)的均聚丙烯和8份(重量)高密度聚乙烯的混合物(A)用一挤出机熔融捏合并通过模口挤成膜片,然后用冷却设备冷却,得到未拉伸膜片。将所得膜片加热到155℃的温度,再在此温度下沿轴向拉伸5倍。
(2)通过混合56份(重量)MI为4.0克/10分钟的均聚丙烯、40份平均颗粒直径为1.5微米的碳酸钙、0.5份(重量)平均颗粒直径为0.8微米的锐钛矿型二氧化钛和3.5份(重量)密度为0.960克/厘米3的高密度聚乙烯而得到的组合物(B)用挤出机熔融捏合,然后通过一个位于上述过程(1)得到的拉伸膜片两侧面之外的模口共挤出。将如此得到的层合物加热到185℃,再在此温度下沿横向拉伸7.5倍得到三层的层合膜。
(3)然后将该三层层合膜的表面进行辉光放电处理,制成由20微米厚的层(B)、50微米厚的层(A)和20微米厚的层(B)组成的层合膜。
厚为90微米的三层层合膜的物理性质列于表1中。
制备实例2
(1)由89份(重量)熔体指数(MI)为0.8克/10分钟(熔点164℃)的均聚丙烯、8份(重量)高密度聚乙烯和3份(重量)颗粒直径为1.5微米的碳酸钙粉末组成的混合物(A)用挤出机熔融捏合后通过模口挤成膜片,然后用冷却设备冷却得到未拉伸膜片。将得到的膜片加热到155℃的温度,再在此温度下沿轴向拉伸5倍。
(2)MI为4.0克/10分钟的均聚丙烯(C)和通过混合50.5份(重量)MI为4.0克/10分钟的聚丙烯、45份(重量)平均颗粒直径为1.2微米的煅烧粘土、1.0份(重量)平均颗粒直径为0.8微米的二氧化钛和3.5份(重量)密度为0.960克/厘米3的高密度聚乙烯得到的组合物(B)分别用挤出机熔融捏合,在模口中层合,然后通过位于上述过程(1)得到的拉伸膜片两侧面之外的模口,以组分(C)层处于最外层的方式进行共挤出。将得到的5层层合物加热到185℃的温度,再在此温度下横向拉伸7.5倍得到五层层合膜。
(3)然后将该5层层合膜的表面经辉光放电处理后得到由5微米厚的层(C)、30微米厚的层(B)、80微米厚的层(A)、30微米厚的层(B)和5微米厚的层(C)组成的层合膜。
总厚150微米的5层层合膜的物理性能列于表1中。
制备实例3
(1)由92份(重量)熔体指数(MI)为0.8克/10分钟(熔点:164℃)的均聚丙烯和8份(重量)密度为0.960克/厘米3的高密度聚乙烯组成的混合物(A)用挤出机熔融捏合后,通过模口挤成膜片,然后用冷却设备冷却,得到未拉抻膜片。将此膜片加热到155℃,再在此温度下沿轴向拉抻5倍。
(2)MI为4.0克10分钟的均聚丙烯(C)和通过混合86.5份(重量)MI为4.0克/10分钟的聚丙烯、10份(重量)平均颗粒直径为1.5微米的碳酸钙和3.5份(重量)高密度聚乙烯得到的组合物(B)分别用挤出机熔融捏合,在模口层合,然后通过位于上述过程(1)得到的拉抻膜片两侧面之外的模口以组分(C)层处于最外层的方式进行共挤出。将得到的5层层合物,加热到185℃,再在此温度下横向拉抻7.5倍得到一个5层层合膜。
(3)该5层层合膜表面经过辉光放电处理后得到由5微米厚的层(C)、20微米厚的层(B)、50微米厚的层(A)、20微米厚的层(B)和5微米厚的层(C)组成的层合膜。
总厚100微米的5层层合膜的物理性能列于表1中。
制备实例4
所用的是Oji Yuka Goseishi有限公司生产的合成描图纸“YUPOTPG 75”(商品名)。
制备实例5
所用的是Oji Yuka Goseishi有限公司生产的通用不透明合成描图纸“YUPO TPG 95”(商品名)。
实例1和2及对比例1至3
用5色胶印法将水腿、汉堡包、炸土豆、炸鸡和蔬菜沙拉的图案、食品名称和价格印在由制备实例1至5得到的半透明膜和不透明合成纸(1.5米长×1米宽)的一个面上。在该半透明膜和不透明合成纸的另一面上用与前述印版相反的负印版也通过5色(黑、黄、红、兰和紫)胶印法印刷。这样就制成了广告灯箱的广告纸。
将这些广告纸各自固定在框架上,在离广告纸背面5厘米处配置6个40瓦白荧光灯管就制成了广告灯箱。
在晚上7点钟将这些广告灯箱安装在快餐店内部及人行道上。由10个快餐店营业员、5个广告公司职员和10个其它人员对这些广告灯箱的外观进行评估。按照他们的评估将这些广告灯箱分成1至5级。然后汇总各个级的投票数。
1级、2级、3级、4级和5级分别记为5分、4分、3分、2分和1分。将各个广告灯箱的分数汇总(分数越高,产品的级别就越高)。
结果列于表1中。
对半透明膜的评价是不同的。但是,反光的并且比对比样品不透明度略高的本发明半透明膜一般得到的评价较好。
不透明合成纸(对比例3)透光性差,印上的文字和图案轮廓暗淡,因而其评价也较差。
本发明提供的广告灯箱能展示具有明亮轮廓的浅黄棕色、棕色、肝褐色和黑色印刷物,而不会降低其亮度。
在详细描述了本发明并参考其具体实例后,对于本技术行家来说进行各种不偏离本发明的原则和范围的变动和改进将是显而易见的。
表1
      实例1       实例2     对比实例1    对比实例2     对比实例3
  制备实例          1         2          3        4          5
  厚度(微米)         90        150         100        75         95
  不透明度(%)         42         62         12        34         92
  白度(%)         88         92         91        86         96
  全光束平均反射率(%)         32         55          2        26         85
  全光束平均透过率(%)         65         45         95        74         12
  拉伸强度(公斤/15毫米宽)    MD         8         17         10         6        8.5
   TD         19         42         25        15        21.5
Clarke刚度(公斤·厘米) MD 37 80 50 25 28
   TD         45        120         60        30         55
密度(克/厘米3) 1.02 1.02 0.94 1.00 0.77
评估    安装位置 A B A B A B A B A B
    一级(人数)二级(人数)三级(人数)四级(人数)五级(人数)     889--     988--    1195--    1312---     12418-     --223-  5677-     35152-     ----25     ----25
    总计 99  101    106    113    61    52  84     84    25    25
  备注    JP-A-1-156062    YUPO trace″TPG  75″   YllPO"FPG 95"
(注)A:餐厅内部;B:人行道上;MD:轴向;TD:横向。

Claims (1)

1.一种广告灯箱用的薄膜,包含由含有白色无机材料细微粉的拉伸树脂膜制成的半透明膜,其中所述半透明膜是一种层合膜,它包含一个含0至40%重量白色无机材料的细微粉的双轴拉伸热塑性树脂膜作为基层,其中所述基层在其两边层合了含0.3至5%重量二氧化钛粉末和10至60%重量选自碳酸钙和煅烧粘土的白色无机材料细微粉的单轴拉伸塑性树脂膜。
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