The most commonly used method to check the printing quality during the printing operation. Whether it is monochrome printing or color printing, the operator must often use his eyes to repeatedly compare the printed matter and the sample sheet, so as to find out the difference between the printed matter and the sample sheet, correct it in time, and ensure the quality of the printed product. The following problems are worthy of our attention: 1. The intensity of light directly affects the judgment of the color of the printed sample. The intensity of light not only has an impact on the light and shade of the color, but also changes the hue of the color. At ordinary times, we observe a light receiving cylinder. The light facing side is bright, the backlight side is dark, and the combination of light and dark is intermediate. The same object is positive color under the standard light source. If the light intensifies gradually, its tone will also change to bright hue. If the brightness 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 strongly reflected. In the same way, with the gradual decrease of light, all kinds of colors change to low lightness hues. When the light weakens to a certain extent, any color will turn black, because the object does not reflect any light, it is black. The intensity of light has an effect on color. The sample table of printing workshop must meet the requirements. Generally, the illuminance should reach about 100lx to correctly identify the color. 2： There are differences between color light and sunlight. In practice, most of them work under the illumination of power supply, and each light source has a certain color. This brings some difficulties to correctly judge the color of the original or product. When viewing the color under the color light, the color changes generally are the same color becomes lighter, and the complementary color becomes dark. For example, under the red light, the red becomes lighter, the Yellow turns orange, the green turns dark, the green turns dark, and the white turns red. Under the green light, green becomes light, green becomes light, yellow turns green yellow, red turns black, white turns green. Under yellow light, yellow turns light, magenta turns red, green turns green, blue turns black, white turns yellow. In the printing workshop, the fluorescent lamp with higher color temperature (3500 ~ 4100k) and better color rendering coefficient is used as the sample light source, but it should be noted that the fluorescent lamp is slightly bluish purple. 3： First look at the sample and then print and then look at the sample, the results will be slightly different, two times to see a color feel different. This phenomenon is called sequential color contrast reaction. Why are there color contrast reactions? This is because the first color makes the color nerve fiber excited, and then look at other colors immediately. The other color nerves quickly excite and cause color sense, while the color nerve that first looks at the color is in the inhibition state after excitation, and then excited slowly, causing negative color reaction. This reaction adds the hue of the new color to form a new color, so it changes the color of the back look. And change the hue or regular, is to look at the first color of the complementary color change. We should pay attention to the above three aspects when we look at the samples, so as to ensure the stability and improvement of the quality of printing products.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, a world famous manufacturing city, is a subsidiary company of Beite packaging (China) Co., Ltd
With an area of 6000 square meters, it is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of advanced production equipment in China
We provide customers with high-quality products and first-class service with the support of the humanized management system and a group of experienced technical personnel.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for food, daily chemicals, and other special-shaped bags
Electronic, toys, medicine, cosmetics, industrial products and other industries of internal and external packaging.
We uphold the integrity of cooperation, good quality, thoughtful service business philosophy, the industry's recognition, products sold all over the world; welcome to call friends from all walks of life
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