What should be noted during the printing process of circular colored copperplate labels?

In the printing process of circular colored copperplate labels, the following aspects need to be noted to ensure printing quality and effect:

1、 Paper characteristics and testing

Paper testing: Before being put into use, each batch of copperplate paper should undergo a series of tests and analyses related to printing suitability, including smoothness, acidity, absorbency, dryness, elasticity, and surface bonding strength. According to the characteristics of paper, corresponding process measures are taken, such as adjusting the viscosity, fluidity, dryness, and anti sticking measures of ink, to achieve standardized and scientific production and prevent printing defects from occurring.

2、 Printing pressure and lining materials

Printing pressure: The printing pressure on copperplate paper should be uniform and appropriate. Excessive pressure may lead to powder loss, unclear dot marks, and increased plate wear. On the contrary, insufficient pressure may lead to weak dot imprints, and even require blindly increasing the ink layer to make up for them, which may result in adverse consequences such as blurred, sticky, and slow drying of the layout.

Lining material: To ensure printing quality and effect, the selection of lining material is also crucial. It is recommended to use neutral to hard materials.

3、 Ink blending and usage

Base color ink mixing: When printing trademarks and packaging products, light colors are often used as the base color and completed through color overlay printing. At this point, heat-resistant and light resistant inks should be used for blending, and it is best to use a glossy paste as a diluent. This can place the base color at the end of printing to avoid damage caused by printing the base color first.

Deep ink thin printing: Due to the smooth surface and poor ink absorption ability of copperplate paper, it is recommended to achieve "deep ink thin printing" as much as possible when printing large solid plates. By appropriately deepening the ink color and thinning the ink layer accordingly, it not only meets the color requirements but also reduces the possibility of overprinting and prevents color stacking that cannot be printed.

4、 Anti sticking process technology

Copperplate paper has weak ink absorption and a relatively smooth back, which can easily cause sticking and dirtying problems when printing on surfaces with high ink exposure or multi-color overlay printing. Therefore, anti sticking measures should be taken to overcome it, such as mixing an appropriate amount of anti sticking agent with gloss oil evenly and adding it to the ink, which can achieve good anti sticking effect during printing. However, the amount of anti sticking agent should be reasonably controlled and should not exceed a certain proportion (such as 4%), in order to avoid ink emulsification, ink layer discoloration, and a decrease in ink layer glossiness.

5、 Full page and plate making

During the whole printing process, attention should be paid to trimming the print dots and cutting off excess edges and corners. During plate making, the use and mixing of new and old corrosive solutions, as well as the addition of protective agents, need to be strictly controlled to ensure the quality of the layout and printing effect.

6、 Environmental factors

The temperature and humidity of the printing environment also need to be considered to avoid environments that are too humid or too dry, which can affect the drying speed and printing quality of the ink.

In summary, the printing process of circular colored copperplate labels requires comprehensive consideration of paper characteristics, printing pressure and backing materials, ink blending and use, anti sticking technology, full plate and plate making, and environmental factors. Only by ensuring reasonable control and optimization of these aspects can we improve printing quality and efficiency, and meet market demand.