Notebook printing is a traditional technology, which can print all kinds of paper in the form of books. Notebook printing covers flat, convex, concave, screen and other printing methods. The types of notebook printing are divided into flexographic printing, narrow rotary printing and digital printing. The wide application of notebook and the continuous development of notebook varieties naturally promote the development of notebook printing technology.

1. Original.

The original design suitable for flexible notebook printing should have the following characteristics: more colors but less overprint; no need to reproduce particularly small details; the screen line is not too high, but can achieve color printing effect; online packaging processing can be done.

2. Film

It meets the needs of plate making, with clear graphics and accurate size specifications; with frosted film, the density of four corners of film is required to be consistent; with film orthography; with transmission densitometer, the white density is less than 0.06; the black density is more than 3.5.

3. Exposure includes back exposure and main exposure in notebook printing.

Back exposure.

The supporting film of the photosensitive resin plate is up and the protective film is down, which is tiled in the exposure drawer to receive exposure. UV light is transmitted through the support film to solidify the photosensitive adhesive layer, so as to establish a stable base, control the washing depth, and strengthen the adhesion between the support film and the photosensitive resin layer. The back exposure time is determined according to the required substrate thickness.

Main exposure.

Also known as front exposure, photosensitive resin plate support film down, protective film up. The main exposure time is determined by the plate type and light source strength. Exposure time is too short will make graphics and text slope is too straight, line bending, small words, small dot part is washed out, otherwise exposure time is too long will apply version, handwriting fuzzy. If there are big lines, small lines, thick lines and thin lines on the same plate, cover them with black film and expose them separately. Small parts will not be lost due to washing, so as to ensure the quality of the plate.

4. Rinse.

The unphotosed part is washed and dissolved to retain the relief of photopolymerization. The time of plate washing depends on the thickness of the plate and the depth of the image in notebook printing. If the time of plate washing is too short, the unphotosed resin will be left on the plate and the depth of plate making will be affected. If the time of plate washing is too long, the plate will expand and the fine part will deform or fall off.

5. Drying.

Remove the solvent to restore the original size and thickness of the plate. The baking temperature is 50-60 ℃. Baking time depends on plate thickness and washing time, generally two hours thick plate, one hour thin plate. Too long baking time and too high baking temperature will make the plate brittle and affect the printing life. If the baking temperature is too low, the drying time will be prolonged. If the baking time is too short, the printing plate will be rotten.

6. Post treatment.

Debonding and post exposure. It can make the photosensitive resin harden (polymerize) thoroughly to achieve the required hardness index, and eliminate the printing plate stickiness, so as to facilitate the ink transfer. The post-treatment time is obtained from the test, so as not to crack and adhere.