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防偽技術:安全線
安全線是指在造紙過程中將一條金線或塑料線置於紙張中間。安全線最早使用的是特制金線,現在使用的是塑料線并已發展成多種多樣,如微型字母安全線,熒光安全線等。其安全線的形狀有直線、波浪形、鋸齒形等,我國在貨幣紙張中已采用直線安全線。據有關資料稱,新版美鈔不僅在紙中埋入金屬線,而且金屬線上縮微了只能用高倍放大鏡才能看清的有關文字。近年來,隨著高科技的迅猛發展,造紙技術也在匯融了其它技術後有了長足的進展,紙張品種琳瑯滿目。

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黑龙江22选5开奖走势图
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