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BuKePrinting >> Design >> 為什麽說油墨輕微乳化有利於膠印印刷

為什麽說油墨輕微乳化有利於膠印印刷

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-09-27 | 720 Views | Share:
為什麽說油墨輕微乳化有利於膠印印刷

為什麽說油墨輕微乳化有利於膠印印刷

首先在膠印印刷時,油墨與潤濕液共存於同一個印版之上,並同時進入滾筒壓印區進行印刷。在膠印印刷壓力的作用下,油墨和潤濕液會在各個輥隙之間被強制混合。所以,油墨乳化是不可避免的。


其次,如果印刷油墨過分乳化,會使油墨墨絲變短,油墨不易從墨鬥中輸出。


第三,如果印刷油墨過分排斥潤濕液,則在印刷壓力作用下,被擠壓混入油墨的潤濕液微珠,會很快地從油墨中離析出來,並附著在油墨的錶面,形成一層阻隔水膜。妨礙油墨向橡皮布轉移,使油墨轉移性能變得極差,導致印品發花。第四,輕微的油墨乳化,可使被擠壓混入油墨中的潤濕液微珠被油墨乳化吸收有效排除潤濕液微珠離析附著在油墨上,有助於油墨的順利傳遞



由此可見,膠印中油墨乳化是不可避免的,是油墨轉移所需要的,絕對的不乳化油墨不能用於膠印印刷。

為什麽說油墨輕微乳化有利於膠印印刷
為什麽說油墨輕微乳化有利於膠印印刷

 

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