[China Packaging Network News] Audio books consist of paper books and dot reading pens. When they are used, they only need to read books with a dot reading pen. Reading a pen can send out corresponding speech or music, which is especially suitable for children's language learning. Read enlightenment and visually impaired people. Audio books are not only popular in the children's books market, but also open up a new space for development in the printing industry.
Audio book sounding principle
The principle of vocalization of audio books is unique. It uses a dot network with a dot area rate of 15% to 20% to form a group of four lines, which forms the logic waveform of the dot matrix. Different vocalization functions are represented by different logic waveforms. When the point reading pen reads the logic waveform of the book page, it is shaped by the shaping circuit, and the related information is identified by the decoder and controlled by special software. Due to the requirement that reading pens can sound correctly on any page of the book at any point, special requirements are placed on the printing process. In the past, some printing factories did not really understand the sounding principles of audio books and did not adopt corresponding production techniques. As a result, individual parts of the books could not be properly vocalized, causing all books to be scrapped, and economic losses were heavy.
Sound book printing process control points
1. Determine the correct printing sequence
According to the sounding principle of the sound book, the logical waveform formed by the dot matrix should be printed with black ink, so the key to ensure accurate sounding is to accurately print the black logic waveform. It must be ensured that the network points in the logic waveform diagram are accurately restored, not deformed, and printed solidly. Therefore, the black logic waveform should be printed in the first color group to ensure that the black dots are tightly attached to the paper surface.
2. Control the printing density of each color
At present, the printing methods of audio books are mainly divided into four-color printing and five-color printing. For four-color printing, logical waveforms are printed with black ink, and texts and color pictures are printed with yellow, magenta, and cyan inks, where the text is neutral gray. Five-color printing is similar to four-color printing, except that the text is printed separately with gray ink. When printing, we must try to ensure that black has a high density, and the density of yellow, magenta, blue and gray can not be too high, otherwise it will cause misreading or even unreadable Logical waveforms that affect normal sounding.
In addition, it should be noted that different printing densities should be determined depending on the paper. Under normal circumstances, when using coated paper, the printing density should be controlled as follows: yellow 0.80, magenta 1.10, cyan 1.20, black 1.65; when using offset paper, the printing density should be controlled as follows: yellow 0.80, magenta 0.90, cyan 1.10, black 1.20.
3. Note the choice of ink
In order to ensure that the logic waveform can be read correctly, black ink should be printed with special black ink, and the remaining three or four colors should be printed with ink with higher transparency.
4 printing section must ensure the accurate recovery of outlets
In the printing section, use the printing plate to detect the restoration of outlets, and ensure that 3% of the outlets can be reproduced. At the same time, the light source of the printing machine should be uniform, and the film and the platen glass must be carefully cleaned to ensure that the plate is free from dirt.
5. The print link should be accurately debugged
First of all, to replace the blanket and backing of the first color set for printing black ink, the thickness should be accurately measured using a micrometer, the rubber should be tightened with a torque wrench, and then tightened once after 10 minutes of operation; Check the pressure of all the plate rollers on the printing plate. Different printing machines should be calibrated according to the standard of the operation manual. Finally, use white paper to print on the ground and check whether the blanket has depressions.
6. Thoroughly clean the fountain solution tank
Before the printing, the water supply system should be completely cleaned. In particular, the oil should be completely removed and the filter core replaced. The pH of the fountain solution should be controlled at 4.8 to 5.6 and the conductivity should be controlled at 800 to 1200 Î¼s/cm.
7. Inspection and maintenance of the printing press
The inspection and maintenance of the printing press is mainly to prevent the dot deformation. First of all, you should clean the roller sets of each color group and coat them with a thin layer of oil. Second, check the pressure of the teeth of each tooth row, clean the tooth pads and dental patches. If you are using an older printing machine, you must eliminate them. The faults that cause the deformation of the dots can be printed; finally, the dusting area should be cleaned to prevent dusting from being left on the prints.
Audio book detection
1. Use a code reader to detect the data of the functional area
Based on the design of audio books, each vocalized functional area has a corresponding 6-digit data that can be read by a dedicated reader provided by the publisher. After reading, the data can be compared with the data provided by the publisher and checked for consistency.
2. Use a pen to detect the sound of the functional area
According to the logic waveform design of the audio book, each functional area corresponds to a sound, so it is possible to read with a point reading pen and compare the sounds heard with the proofs.
3. Set the checkpoint with a template, check with a code reader and a pen reader
Comprehensive application of the above two detection methods, using the finished product line of the book as a reference, using cardboard to make a template, marking a number of detection holes with an aperture of 8 mm on the cardboard from top to bottom, left to right, and placing the paper jam On the print, the data and sound of the print in the hole are then detected with a code reader and a point pen, and compared with the proof.
4. Focus on checking the deepest color picture
Since the darkest areas are easy to cover the logic waveforms, which can cause misreading or even difficulty in reading, check the dark areas in the color image particularly carefully.