Five tips for purchasing a small offset press
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1. Equipment selection
Equipment selection should be combined with the type of live source to determine the paper and color number printing.
(1) Paper web
Under normal circumstances, the large six-open, big eight-open (including four open) small offset printing machine is mainly used for the printing of social parts, as well as the printing of documents, bills and test papers of institutions, schools and other enterprises and institutions. If you are planning to develop or do office use in the short-running fast-printing market of social commercial parts, then the six-boot will be the first choice.
(2) color number
Mainly for printing monochrome, you can choose monochrome small offset press equipment supplies. Monochrome machines can also process color, but it is not economical to print on a two-color machine or even a four-color machine. The multi-color small offset printing machine has small format, flexible printing, high speed, high precision of overprinting and good quality of dot reproduction. It is suitable for color short-run fast printing business such as printing short-color color leaflet, sample small batch of self-adhesive labels and so on.
2. Equipment performance
The most familiar performance of offset presses is printing speed, but other factors such as production space, preparation time, maintenance, and reserves of available parts must also be considered. Generally, the speed of printing short-running equipment should not be too high. The long-term version is the opposite. The machine type should be selected according to the existing site. The machine should be easy to maintain to extend its service life. In addition, it is necessary to check whether the spare parts supply is timely. The Chamber of Commerce provides sufficient spare parts to provide timely assistance when needed.
3. Printing performance
(1) Printing accuracy
It is mainly to investigate whether the accuracy of the printing mesh adjustment product can reach 175 lines/inch ink balance, whether the stability of the mesh deformation point is clear and full.
(2) Overprint performance
In multi-color printing, the overprinting accuracy of the machine is particularly important, especially printing thin paper bills, joint orders, etc., and the printing rules are required to be accurate and stable. Investigate the multicolor machine must test the coincidence of the overprint rule. Generally, domestic small offset printing equipment requires overprinting error less than O.1mm. The overprinting error of imported equipment is generally less than 0.05mm.
(3) Working stability
Observing the smoothness of the machine at the highest speed, viewing the vibration level, monitoring the noise, simultaneously printing the highest speed of the tissue, and the stability of the rule components are also important indicators. In addition, the machining accuracy of the machine, that is, the machining level of the parts and the precision of the castings, should be fully tested.
(4) Automation control
Mainly to see whether the equipment operation is fast and convenient, whether the control system can complete various operations and inspections through the central operation panel and carefully check the accuracy of the water and ink presets, automatically sort the equipment (guarantee the orderly work of each organization), and detect the paper. Transport failure and automatic clutch pressure.
4. Additional equipment
Many manufacturers now offer optional equipment to facilitate other processes such as cutting and labeling, glazing and drying (curing) devices, the versatile small offset press mentioned above. Users should reasonably configure and increase the added value of the printed products according to the business characteristics and quality requirements.
5. Brand selection
At present, imported brands such as Heidelberg, Liyoubi, Hamada, Ebara and Adast have a certain share in the domestic small offset press market.