How to avoid the pasting phenomenon in the printing process of colored copperplate label paper?

In order to avoid the pasting phenomenon in the printing process of colored copper plate label paper, the following measures can be taken:

First, control ink performance

1.Choose the right ink: Use the ink that is suitable for printing on coated paper to ensure that the ink has good fluidity and drying. Avoid using inks that are too thin or dry too quickly to prevent the spread of dots or the paste caused by ink accumulation.

2.Adjust ink viscosity: Adjust the viscosity of ink according to the performance of the printing press and the absorption of the paper. Too high viscosity may cause the ink to dry too fast on the screen plate, resulting in gridlock; If the viscosity is too low, the ink may be squeezed out under the printing pressure, forming a fuzzy impression.

3.Control the drying speed: Use a fast drying solvent or add a desiccant to speed up the drying speed of the ink, but avoid drying too fast to cause the ink to crust on the screen. At the same time, keep the humidity and temperature of the printing environment stable to reduce the change in the drying speed of the ink.

Second, optimize the printing process

1.Adjust the printing pressure: ensure that the printing pressure is moderate to avoid excessive pressure resulting in plate deformation or dot expansion. At the same time, keep the parts of the printing press clean and lubricated to reduce the phenomenon of paste caused by mechanical failure.

2.Control the amount of ink supply: according to the graphic elements of the print, appropriate control of the amount of ink supply. Avoid excessive ink supply resulting in too thick ink layer, resulting in paste plate under the action of printing pressure.

3.Keep the printing machine clean: regularly clean the cylinder, screen plate and other parts of the printing machine to prevent dust, paper and other impurities attached to the printing plate caused by paste. Especially when replacing paper or ink, pay more attention to cleaning work.

Third, improve paper performance

1.Choose the right paper: Choose a coated paper with good ink absorption and smooth surface as a label paper to reduce the penetration and diffusion of ink on the surface of the paper, thereby reducing the risk of pasting.

2.Adjust the humidity of the paper: keep the humidity of the paper moderate, avoid the paper too dry or too wet resulting in poor ink absorption or excessive diffusion. A humidifier or dehumidifier can be used to adjust the humidity of the printing shop.

Fourth, strengthen operational training

1.Improve operator skills: Regular training of printing machine operators to improve their operational skills and quality awareness. Ensure that the operator can master the various parameter adjustment methods of the printing press, as well as the ability to respond to sudden failures.

2.Establish a quality control system: Establish a sound printing quality control system, and strictly monitor and test all aspects of the printing process. Find and deal with quality problems such as paste plate in time to ensure stable quality of printed matter.

Fifth, other precautions

1.Pay attention to the ambient temperature and humidity: the ambient temperature and humidity of the printing shop have a great impact on the printing quality. In general, the indoor temperature should be maintained between 22-26 degrees, and the relative humidity should be controlled at about 65%. Too high or too low temperature and humidity can lead to changes in ink performance, resulting in paste phenomenon.

2.Replace wearing parts regularly: such as screen plates, scrapers and other wearing parts will wear or aging after a period of time, affecting the printing quality. Therefore, these wearing parts need to be replaced regularly to keep the press in good condition.

To sum up, avoiding the pasting phenomenon in the printing process of color copperplate label paper needs to start from many aspects, including controlling ink performance, optimizing printing process, improving paper performance, strengthening operational training and other precautions. The implementation of these measures can effectively reduce the incidence of pasting and improve the quality and efficiency of printed matter.