Preprint edition and notes

There are many procedures for printing. To get a good print, each process must be free from problems. Conversely, if there is a mistake in one process, it will not be possible to obtain high-quality prints. If the printing process is subdivided, there are scanning, group making, filming, proofing, printing, and printing.

The group edition is an important process of carrying out photo and text mixing. Standardized edition and standardization are effective means to guarantee and improve quality. The impact of this process on quality is mainly reflected in:

1 Text, pictures, color blocks, gradient operations are not standardized, so that the layout appears too crowded or too loose affect the overall aesthetic.

2 The difference in visual effects due to differences in the resolution and color mode used in screen effects and actual printing results in inconsistencies between the printing effect and the imagination.

3 Overprinting occurs when the smaller size or thin line is multicolored.

4 Make the picture black and white by directly using RGB format edition.

5 In the process of group printing, the picture is pulled and the picture is poor and the output is slow. Especially the enlargement of the picture has a great influence on the picture effect. Therefore, the group edition should strictly follow the requirements of standardization and standardization. If the picture must be in the CMYK format, the picture size should be changed in Photoshop. Do not press or deform the picture, text block, or color block spacing. The kerning of the text should not change, making the layout beautiful.

The filming, also called output, includes several processes such as RIP dispensing, photo-exposure film exposure and rinsing, and inspection. Using data and standardization to control this process is an important means of ensuring quality. The main impact of this process on quality is:

1 Due to the poor linearity of the output film, the text is thick and fat, the printing effect is too dark, the color of the picture is deviated, the level of the image is poorly reproduced, and the color of the color block is deviated.

2 The film bottom ash is too large and the density is insufficient due to improper film exposure and processing conditions. Reflected on the layout is the layout from the dirty, real hair virtual, low-key network level lost, absolutely network, paste network.

3 Due to the high or low number of screens, the picture paste network, absolute network, and picture level performance are poor.

4 Moire and poor color performance due to improper screen angle.

5 Overprint errors and rule lines due to the low positioning accuracy of the film result in an imposition error.

6 Inconsistent appearance of the layout parameters results in different layouts.

7 Due to improper operations such as rinsing and inspection, dicing, horseshoe prints, and dirty tracks are directly reflected on the layout, such as scratches, imaginary dots, and layout stains.

Therefore, the following points should be noted during the output of the film:

1 Data control is the basis for a good film output process control and quality assurance. There are two aspects of the data control of the output of the film, one is to ensure the accuracy of the output network, the network error should be controlled within 2%; the second is the bottom of the film after the output of the film, the maximum density value meets the requirements, bottom ash (D.) Less than 0.04, maximum density Dmax ≥ 3.0. This requires a series of tests on the film exposure and rinsing process to find a set of accurate system parameters and make corresponding adjustments for different batches of raw materials at different times. For the different films, through the test and multiple linear adjustments, so that the film meets the above requirements.

2 Careful operation and careful adjustment. Normalized operation is an important step to ensure the quality of output. The output must ensure that all layout parameters are consistent, the number of screen lines meets the printing requirements, the screen angle does not produce moiré accurately, and the four-color version repeat positioning accuracy is within 25 μm, and the registration cross position, size, and thickness are uniform.

After the completion of the filming task, it will be proofed. There are two types of proofing: digital proofing and mock proofing. The quality of the film directly determines the effect of the proofing. Therefore, how well the film is handled has a great influence on the proofing and the backside printing. Shaiban should pay attention to the choice of light intensity and exposure time. The solution configuration in the plate processor is also required to be done. Generally, the test can be done first, and then the relevant values ​​can be determined.