What should be noted when printing circular colored copperplate paper?

When printing circular colored copperplate paper, the following aspects should be noted:

1、 Paper selection and testing

Paper characteristic testing: Before being put into use, each batch of copperplate paper should undergo a series of tests and analyses related to printing adaptability, including smoothness, acidity and alkalinity, absorbency, dryness, stretchability, 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 the occurrence of printing defects.

Paper thickness and specifications: Choose the appropriate paper thickness and diameter based on the purpose and specifications of the printed material. Thicker paper can improve the texture and grade of printed materials, but it can also increase costs and shipping expenses.

2、 Printing pressure and pad technology

Printing pressure adjustment: The printing pressure of copperplate paper should be uniform and appropriate. Excessive pressure can easily lead to issues such as powder loss, unclear dot marks, and plate wear; On the contrary, it is easy to cause adverse consequences such as weak dot imprints, uneven layout, sticking, slow drying, and poor overlapping printing. Therefore, it is necessary to ensure uniform and appropriate pressure during printing, and it is best to use neutral hard materials for the lining.

Pad technology: Good pad technology can ensure the uniformity and brightness of the printing ink layer. During the printing process, the thickness and shape of the pad should be adjusted reasonably according to the characteristics of the paper and printing requirements.

3、 Ink selection and blending

Ink type: Choose the ink type suitable for copperplate paper printing, such as heat-resistant and light resistant ink. Avoid using ink mixed with ordinary water-based pigment ink to ensure printing effect and color stability.

Ink blending: When blending base ink, it is recommended to use heat-resistant and light resistant ink as much as possible, and it is best to use glossy ink as a diluent. This can improve the color vividness and glossiness of printed materials, while preventing the problem of friction and damage to the ink layer caused by the base color being printed first.

Ink viscosity and flowability: Adjust the viscosity and flowability of ink based on the absorbency and dryness of the paper. Appropriate ink viscosity and fluidity can ensure uniform distribution and penetration of ink on paper, thereby improving printing quality.

4、 Printing process and technology

Stacked color printing: When printing trademarks and packaging products on copperplate paper, a light color is often used as the base color, and it is printed through stacked color printing. In the process of color overlay printing, it is necessary to ensure that the printing effect of each color meets the requirements and avoid problems such as color difference and poor overlay printing.

Deep ink thin printing: Due to the smooth surface and poor ink absorption ability of copperplate paper, when printing large format solid plates, it is advisable to achieve "deep ink thin printing" as much as possible. That is to say, the ink color should be appropriately darker, and the ink layer should be correspondingly thinner during printing. This not only meets the requirements of printing color, but also reduces the chance of overprinting and prevents color stacking from not being printed.

Anti sticking measures: Copperplate paper has weak ink absorption and a smooth back, which can easily cause sticking and dirt problems when printing on surfaces with high ink exposure or multi-color overprinting. Therefore, anti sticking measures should be taken to overcome it, such as adding an appropriate amount of anti sticking agent to the ink and stirring it evenly, but the amount of anti sticking agent should not exceed 4%, in order to avoid adverse effects such as ink emulsification, printing ink layer discoloration, and decreased ink layer glossiness.

5、 Printing environment and maintenance

Printing environment: Keep the printing environment clean and dry, avoiding the influence of dust and moisture on the printing effect. At the same time, it is necessary to ensure the stability and accuracy of printing equipment to improve printing quality.

Equipment maintenance: Regularly maintain and upkeep printing equipment, including cleaning printing cylinders, replacing worn parts, etc. This can ensure the normal operation of the equipment and the stability of the printing effect.

In summary, when printing circular colored copperplate paper, attention should be paid to paper selection and testing, printing pressure and pad technology, ink selection and blending, printing process and technology, as well as printing environment and maintenance. Only by comprehensively considering these factors can we ensure the printing of high-quality circular colored copperplate paper products.