Practical Guidelines for Web Printing Production

In the printing and publishing process, the materials provided to the printing staff must comply with the standards described in the SWOP parameter description. The printing staff assumes that the specific color control is used to ensure faithful reproduction. The following references are published guidelines for five levels of publication using offset offset paper and thermosetting four-color inks as reference.

Printing machine production guidelines

In the past few years, new types of printing presses have become more stable, production speeds have been faster, many printing processes have gradually shifted to positive printing, and more and better measurement and control technologies have emerged, which have improved the printing production process. quality. The problem of dot enlargement in the production process of many printing presses has been significantly reduced. In specific press testing conducted by SWOP, the dot enlargement has been controlled at 18% or even lower. In other tests, the dot-ups for printing and publishing remained at about 24% of the standard.

The responsibility of the print production staff is to visually match the printed proofs. Since SWOP specifies a dot gain value of approximately 20% in the proofing, the requirements for the printing production process are even higher and more perfect. Only in this way can the closest matching to the proofs be guaranteed. These guidelines work well (makes the print product easier to accept) because it adheres to the guidelines of COLORBALANCE and PROCESS CONTROL during the printing process. It is well known that in the process of copying, "paper weight" is often less important than color balance and hue shift. It should also be emphasized once again that no matter how high or low an outlet is, it cannot comment on its good or bad. It is harmful if it loses control or instability.

Printer's color control bar

A color control strip suitable for measurement must be included on the printed material. The control strip should use 133 lines of screened lines, containing solid blocks of each color; 25%, 50%, and 75% of color blocks; two-color and three-color overprinted solid overprint colors; and visual and ghosting The obvious degree of network expansion. The relationship between the trim size of the publication and the cut size of the web should be within the range that allows the control bar to exist.

The control bar described above can obtain GATF/SWOP product control bar through GATF.

Film copying and plate making

In the process of film copying, the resolution object control ruler and the CT ruler should be combined to control the degree of film copying, copying, and plate exposure. Products that meet this requirement include the UGRA Plate Control Scale and the GATF Plate Control Strip.

Positive and negative plate making

Although most print proofs are made from traditional negatives, the print production of publications can use both negative and positive plates. Normally, positive-working plates tend to shrink by several percentage points, while negative-working plates tend to increase by several percentage points. In order to meet the needs of removing dirt, cutting, or prolonging the printing life of the printing plate, it is possible to exaggerate the expansion and contraction of outlets during exposure. Due to differences in platemaking procedures, it is normal for 5% or even greater deviations to occur with negative and positive graphic printing. It is recommended that the total dot gain value and the total tonal value increase range used here be sufficiently wide to include platemaking and other differences caused by conventional processing.

The impact of computer-to-plate (CTP)

The CTP platesetter is designed to ensure that the fixed dot percentages in the electronic file are accurately copied onto the plate. The CTP system has a greater ability to change the dot size specified in the electronic file. The CTP needs to be optimized at the time of output so that the final printing effect best matches the provided SWOP proofs.

Super Calendered (SC) paper

Some special offset publications are printed using Super Dash (SC paper). As with other production materials, the purpose of printing is to visually match the submitted SWOP proofs as closely as possible. The acceptability of the match is up to the customer, but there are some techniques that can improve the potential for matching the SC paper print image with the SWOP proof. If possible, the film and electronic documents provided by the SC paper printing shall meet the following conditions:

The number of screens for the output image should be 120 lines per inch.

According to the performance characteristics of the press, the maximum TAC value should be chosen between 240% and 260%.

The color separation curve is 4% to 6% lower in the midtone portion than the standard SWOP negative color separation curve to compensate for the increase in dot gain values ​​when printed on the SC paper surface.

When providing film or electronic documents for publications printed on the surface of SC paper, check with publishers for specific information.

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