Due to the fierce competition in the market, there are more and more short-form tasks in gravure plastic printing. In this way, the proportion of plate-making fees in the entire cost often exceeds 50% (see Table 1). As a result, there is a need to save platemaking costs.
Table 1: Cost analysis of gravure printing and packaging of a German cosmetics company in March 2000
Package name Total cost (RMB) Plate-making cost (RMB) Plate-making cost as a percentage of total cost Soap packaging 34100 16100 47%
Stand-up bag packaging 36400 18400 51%
6ml Promotional Pack 31100 16100 52%
25ml Promotional Pack 33400 18400 55%
If you further analyze the composition of plate-making costs, you will find that there are full-bottom white plates in each set of printing plates. So, can we start from saving plate-making costs and use four full-plate white plates together?
Theoretically, the role of the white background is to be used as a background color, to increase the opacity of the plastic film, so that other colors can be better expressed; therefore, the white background can be used as a single. However, in actual use, due to the limitations of the supplier's printing machine mechanical structure, printing plates with different diameters cannot be used in one printing machine at the same time, so each set of printing plates must have a "own" full white plate. How to "save" the white version with full background? From a practical point of view, there are the following options:
1. Change the structure of the printing press: from the current motor drive of the printing press, the shaft drive between the units, to the independent motor drive of the final unit, so that the surface linear speed of the plate cylinders of different diameters are the same.
2. Use white inner composite material.
3. Add equipment: install white plate coating device behind the existing printing machine.
4. Change the printing process, after printing other colors, the film will be printed on the machine and then white.
From a technical perspective, the advantages and disadvantages of each program are as follows:
â‘ Change the structure of the printing machine.
Technical feasibility: Since the late 1990s, the latest European gravure printing machine has been driven by an independent motor for each unit.
Advantages: It does not change the original process and does not increase its equipment.
Disadvantages: there are risks, high requirements on the mechanical and electrical level of the printing plant.
â‘¡Use white inner composite material.
Technical feasibility: proved feasible after small-scale trial production.
Advantages: No risk, no investment, indirectly increase the number of colors that can be printed by the printing press.
Disadvantages: high requirements for white inner composite materials, increasing costs; it is more difficult to control colors during printing.
â‘¢ Install white plate coating device behind the existing printing machine.
Technical feasibility: no difference with current technology.
Advantages: Indirectly increase the number of colors that can be printed by the printing press, without increasing the material cost.
Disadvantages: There is equipment investment; it is difficult to control the color when printing.
â‘£After printing other colors, the film is printed on the machine for white.
Technical feasibility: no difference with current technology.
Advantages: Indirectly increase the number of colors that can be printed by the printing press, without increasing the material cost.
Disadvantages: high equipment loss and long printing time; difficult to control during the first printing.
After synthesizing the above schemes, it was decided to adopt scheme 2 and scheme 4 in combination, and in the production to decide the specific method according to the actual situation of the task and the printing press. In future production, similar short-term tasks save a total of 6% of the total cost. G
(Author: Shanghai Publishing and Printing College, Shanghai Henkel Daily Chemical Service Co., Ltd.)
Editor in charge / Zhang Sufang
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