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                凹版印刷油墨的调色注意事项
                调色的注意事项 

                ①仔细观察色样,特别注意观察被█印基材,从基材粗糙与光滑反射程度选择油墨。例如:油墨印刷在光滑反光极ㄨ强的铝板或易拉罐上,选择透明性高的油墨,将有助于大大增强油墨的金属光泽; 

                ②选择调→色所需的油墨时,尽可能避免混合过多油¤墨。尽量使用接近♀于标准色,及由单一颜料制成的油墨。调色使用色沫过多,离标■准色越远,则㊣亮度越差。混合出来的颜色哑光程度▃越高,不可能借调色来调制原色。所以说调色时⊙能用两种混配,就不〗用三种,越少越好。 

                ③要特别注意』油墨着色力。如果@ 所选用油墨浓度不够高,无论怎样拼调,也无法达到标准颜色浓度。 

                ④需要加入白黑墨时,应特别注意所〇加入的分量及称量的准确性。在所有油墨种,白墨的遮盖力特强@。加入过多,不但会冲淡颜色,同时也会阻止底材反光程度。不过对于印刷凹凸不平基材如尼龙布、纸板,为了保证印品外观,最好印刷一层作为底色的白色。由于黑墨的着色力特强,稍不慎加入过多就需要加入相当多其它色墨来调整颜色造成浪费,因此需特别注∞意。 

                ⑤制作淡色油墨时,应从墨膜透光程度判断,其应加入多少白墨或者调油墨(冲淡剂)进行调色。绝对不允许把溶剂(稀释剂)用于淡颜色。溶剂加入过多,不但会影响印刷性能,而且会破坏油墨结构,造成颜料∞与树脂油分离。出现沉淀或者大大降低油墨的光泽及亮度。