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BuKePrinting >> process >> 印刷噴粉的加放對覆膜的影響

印刷噴粉的加放對覆膜的影響

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-10-04 | 441 Views | Share:
印刷噴粉的加放對覆膜的影響

印刷噴粉的加放對覆膜的影響

防黏劑能夠減輕或防止印跡粘連、蹭臟等故障,目前,膠印常常採用噴粉工藝來解決背面蹭臟的問題,以適應多色高速印刷的需要。噴粉大都是由谷類澱粉以及天然的懸浮型物質組成,二氧化硅也被廣泛採用。澱粉顆粒直徑約為7~10pm;二氧化硅的顆粒直徑約為5~8μm。

噴粉的防黏作用主要是在油墨層錶面形成層不可逆的墊子,從而減少粘連。由於顆粒較粗,如果印刷過程中噴粉過多,這些顆粒浮在印刷品錶面,覆膜時黏合劑不是每處都

與墨層黏合,而是與這層噴粉黏合,從而造成假黏現象,嚴重影響了覆膜質量。因此,印刷過程中應盡量控制噴粉用量,以免給覆膜造成後患。對於已噴粉的印刷品,在覆膜前用乾布逐張擦拭掉噴粉顆粒,但這畢竟是被動的。

印品粘臟的本質在於油墨針,對這個問題必須在工藝上對油墨進行改進,給油墨按比例加10%的防黏劑,對防粘臟十分有效。

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印刷噴粉的加放對覆膜的影響
印刷噴粉的加放對覆膜的影響

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