Paper Cigarette Boxes The role of pre-press plate assembly and film production process can not be underestimated

Paper Cigarette Boxes The role of pre-press plate assembly and film production process can not be underestimated

 

There are many processes in printing, in order to get a good print, each process must not have a problem; On the contrary, if there is a mistake in a process, it is impossible to get high-quality printed matter. If the printing process is subdivided, there are scanning, plate making, film production, proofing, plate printing, etc.

 

Plate grouping is an important process of graphic mixing, and the standardization of plate grouping is an effective means to ensure and improve quality. The impact of this process on quality is mainly manifested in:

 

① Text, pictures, color blocks, gradient operation is not standardized, so that the layout appears too crowded or too loose affect the overall beauty.

 

Due to the difference in visual effect between the screen effect and the resolution and color mode used in actual printing, the printing effect is not consistent with the imagination.

 

③ Small size or thin lines using multi-color sets appear overprint double.

 

④ The RGB format is used directly to make the picture black and white.

 

⑤ In the process of drawing and pressing the picture, the picture effect is poor and the output is slow. In particular, enlarging the picture has a great impact on the picture effect. Therefore, the group should be in strict accordance with the requirements of standardization and standardization. If the picture must be CMYK format, the size of the picture should be changed in Photoshop, do not pull, deformation, picture, text block, color block spacing should be standardized and unified; The kerning of the text is generally not changed to make the layout beautiful.

 

Film out, also known as output, the process includes RIP sending, phototypesetter exposure film and washing, inspection and other processes. To control this process with data and standardization is an important means to ensure quality. The main effects of this process on quality are:

 

① Due to poor linearization of the output film, the text is thick and fat, the printing effect is too black, the picture color deviation and the level reproduction is poor, and the color block color deviation.

 

(2) Due to the film exposure, washing conditions caused by improper film bottom gray is too large, insufficient density. Reflected in the layout is the layout of the dirty, the field is false, low-key network level loss, network, paste.

 

③ Due to the number of mesh added too high or too low caused by the picture paste network, network, picture level performance is poor.

 

④ Due to improper mesh Angle, the turtle grain and color performance are poor.

 

⑤ Due to the film positioning accuracy is too low and the overprinting error and the rule line is too thick, resulting in the composition error.

 

⑥ Typesetting parameters before and after inconsistent appearance of different layout effect is different.

 

⑦ Due to improper operation such as washing and inspection, scratches, horseshoe prints, dirty marks, etc., are directly reflected in the layout of scratches, virtual points, and dirty marks of the layout.

 

Therefore, the following points should be noted in the film output process:

① Data control is the basis for controlling the output process of film and ensuring the quality. The data control of film output has two aspects, one is to ensure the accuracy of the output dot, the dot error should be controlled within 2%; The second is the bottom gray after the film output, the maximum density value meets the requirements, the bottom gray (D.) Should be less than 0.04, the maximum density Dmax≥3.0. It is necessary to find a set of accurate system parameters through multiple tests of the film exposure and washing process, and make corresponding adjustments to different batches of raw materials at different times. According to different film, through the test and several linear adjustment, to make the film meet the above requirements.

 

② Careful operation, careful adjustment. Standardization is an important step to ensure the quality of output. In the output, it is necessary to ensure that the layout parameters are consistent, the number of network cables meets the printing requirements, the mesh Angle is accurate and does not produce moire, the repeated positioning accuracy of the four color plates is within 25μm, and the position, size and thickness of the set cross are neat and uniform.

 

We need to make a prototype after we finish the production. There are two kinds of proofing: digital proofing and analog proofing. The quality of the film directly determines the effect of the proofing, so how the film is turned off has a great impact on the proofing, as well as the printing plate behind. The printing plate should pay attention to the choice of light intensity and exposure time. The solution configuration in the stamping machine should also be done according to the requirements, generally can be tested first, and then decide the relevant value.