Whether it is a single-color printing or a color-printed packaging bag
, the operator needs to use his own eyes to repeatedly compare the printed product with the sample to find out the difference between the printed product and the sample, and correct it in time to ensure the printing quality of the packaging bag. Next, the professional flexible packaging manufacturer Packaging will discuss how to reduce the printing color difference of color packaging bags
based on the experience of several printing masters who have been in the factory for more than 20 years. 1. The intensity of light directly affects the appearance of the color of the sample. The intensity of light not only affects the light and shade of the color, but also changes the appearance of the color. The same object is a positive color under a standard light source. If the light gradually becomes stronger, its color will also change to a bright hue. If the light is enhanced to a certain extent, any color can become white. The reflection point of black porcelain is also white, because the light at the reflection point is concentrated and reflected violently. In the same way, the light gradually decreases, and various colors change to the hue with low brightness. When the light is weakened to a certain extent, any color will become black, because the object does not reflect any light, it is black. The viewing table in the printing workshop must meet the requirements. Generally, the illuminance is required to reach about 100LX in order to correctly identify the color. 2. There is a difference between viewing samples under colored light and viewing samples under sunlight. In actual production, most of them work under the illumination of a power source, and each light source has a certain color. This brings certain difficulties to the correct judgment of the original or product color. When viewing the color under the shade, the color change is generally the same color becomes lighter, and the complementary color becomes darker. For example, under red light, red becomes lighter, yellow becomes orange, green becomes darker, cyan becomes darker, and white becomes red. Under green light, green becomes lighter, green becomes lighter, yellow becomes green-yellow, red becomes black, and white becomes green. Under yellow light, yellow becomes lighter, magenta becomes red, cyan becomes green, blue becomes black, and white becomes yellow. Under blue light, blue becomes lighter, cyan becomes lighter, green becomes darker, yellow becomes black, and white becomes blue. In the printing workshop, fluorescent lamps with higher color temperature (3500K~4100K) and better color rendering coefficient are generally selected as the light source for viewing samples, but it should be noted that the fluorescent lamps are slightly bluish-purple. 3. Look at the sample first, then look at the printed product, and first look at the printed product and then look at the sample, the effect will be slightly different. When you look at one color twice, the feeling is different. This phenomenon is called successive color contrast reaction.
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