Quality Control of Printed Products in Modern Printing Enterprises

A print must be completed through three phases: prepress, India, and postpress. Each process is related to the quality of the printed matter. Therefore, the quality control of the printed matter must be carried out from prepress to postpress. The quality control of printed materials cannot rely solely on experience, but rely on modern scientific methods. Data, standardization, and standardization are particularly emphasized here. The entire process of raw materials, production processes, and finished products is emphasized.

Prepress includes design and plate making; India includes paper cutting, ink transfer, and printing; India includes glazing, calendering, laminating, electro-aluminum hot stamping, embossing, embossing, die-cutting, and pasting.

Printing is a very important part, it reflects the effect of design and plate making, and is the main product line. Post-press processing can increase the added value and embellishment of printed products and is the last link.

1 Design and plate making

Our packaging customers expect us to put their products on the box and make consumers feel refreshed, so as to achieve the purpose of promotion. Therefore, the design is a crucial part of the quality carton quality assurance. It must achieve the comprehensive effect of pattern, color and text, highlight the subject, and at the same time take into consideration the feasibility and actual effect of plate making, printing and post-processing. In the use of color, as much as possible to reduce the color or superimposition, special circumstances, except for spot color. In the text, it is necessary to arrange the words and patterns and combine them properly so as to avoid the use of oversized and undersized yin and yang characters as much as possible. Avoid unnecessary cumbersome and complicated pattern structure, which will bring difficulties to printing.

Platemaking is the intermediate link of packaging and decorating design and printing, and it is the bridge between design and printing. The task of platemaking not only correctly reflects the requirements of the original design, but also corrects the parts that do not meet the printing process requirements. In the work of platemaking, we must first do a good job in the quality verification of the manuscript. If the quality of the manuscript does not meet the requirements, we will definitely not use it. In color separation, it is necessary to take into account the equipment of the offset printing press. It is more advantageous to print according to the traditional color separation or non-color separation plate making. There is also an understanding of the printing dot enlargement curve of each printing press. The quality of each process in the platemaking must be strictly controlled and data monitoring such as printing, proofing, etc. must be performed.

2 paper

1) General requirements for printing paper

Paper surface strength is better; thickness should be the same; ink absorption is better; flexibility is less; pH is preferably neutral or weakly acidic; toughness is required; surface is smooth; paper appearance is good.

2) Inspection of paper by printing house 1 Moisture content

The change in the moisture content of the paper is important for printing. Paper is made from plant fibers, fillers, rubber, etc., which easily absorbs moisture. Changes in the moisture content of the paper during printing can cause changes in the size and shape of the paper, which can affect overprinting and paper feeding. Therefore, we must inspect the incoming paper to see if the moisture content meets the standard. In general, coated paper is about 5%, and whiteboard is about 7%.

2 Whiteness

How the whiteness of the paper determines the color rendering range. The whiteness is high, the color is bright, and the contrast of the color gradation is opened; the whiteness is low, the color saturation of the ink is lowered, the color is dark and turbid, and the color gradation contrast cannot be pulled open. Therefore, we have to inspect the whiteness of the incoming paper so that the whiteness of the whole batch of paper is consistent.

3 thickness

The thickness of the paper will affect the pressure during printing, and it will cause difficulty in the distribution of printing pressure.

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