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防伪技术:安全线
安全线是指在造纸过程中将一条金线或塑料线置於纸张中间。安全线最早使用的是特制金线,现在使用的是塑料线并已发展成多种多样,如微型字母安全线,荧光安全线等。其安全线的形状有直线、波浪形、锯齿形等,我国在货币纸张中已采用直线安全线。据有关资料称,新版美钞不仅在纸?#26032;?#20837;金属线,而且金属线上缩微了只能用高倍放大镜才能看清的有关文字。近年来,随着高科技的迅猛发展,造纸技术也在汇融了其它技术後有了长足的进展,纸张品种琳琅满目。

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黑龙江22选5开奖走势图
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