Otaku Engineer in Great Tang Dynasty

? After giving Liu Yidao the drawing of the anti-counterfeiting seal and the pattern of his own Tang Yuan pattern, Li Zexuan went to find Fu Bo and assigned another task.

"Master, there is such a magical paper in this world?"

After hearing Li Zexuan's coming, Uncle Fu couldn't help but be surprised.

Li Zexuan smiled and said, "Of course, it's just that the production method is more troublesome. When it is finished, Uncle Fu, you will understand that what I said today is true!"

Yes, he intends to make a batch of special paper in the workshop, specifically for the production of banknotes!

After all, if you want to prevent banknotes from being copied in the future, just relying on an anti-counterfeiting seal is not enough. If you set up another anti-counterfeiting method, you will have an extra insurance!

"Okay! Since the young master is so confident, why not try it!"

Uncle Fu nodded, then took a pen and paper from the side, and said with emotion, "Hehe! Master! Don't blame it! I am old and my memory is not as good as before! Master, please tell me in detail how to make this water-textured paper, I write it down first, and try common sense in these two days!"

Li Zexuan looked at Fu Bo's wrinkled but kind face, and smiled gently: "What's so strange about this, after all, it's not as good as a bad pen! Fu Bo, you usually leave the work of the workshop to the following Just take care of it, but don’t get tired!"

Uncle Fu smiled and said, "Haha! Thank you for your concern, the old man saves it! Now in the workshop, the old man just moves his mouth, it's not exhausted. The great doctor Sun praised the old man for his health!"

"That's good!"

Li Zexuan smiled heartily and said the business: "Fu Bo, this kind of paper is actually not too complicated to make. First of all, let the steel plant forge a batch of water-grain rollers with convex patterns. The water roller is installed on the rollers of our paper machine to emboss the paper.

In the process of papermaking, the water pattern roller will contact the front side of the paper, and the front side of the paper will be printed with water patterns! The vertical and horizontal water patterns on the wet paper page will show a neatly arranged pattern with different transparency, visible from a plain view!

By the way, the material for the production of water-grained paper must be made of mulberry bark, and other materials cannot be used. Looking back, Fu Bo, you arrange for someone to buy a batch of mulberry bark from the workshop, first buy it close to Chang'an, and then go to Bashu area. Buy, because there should be a lot of Chushu in the Bashu area. "

Water-grained paper is the kind of paper that can show bright lines or patterns in addition to the curtain pattern when looking at the light. It is the same reason that you can see the heads of great men when you look at the light. Adding the potential beauty of paper, it can also be used as banknote anti-counterfeiting!

In fact, water-grained paper has existed in ancient times, and it is not a patent of modern people. According to the original history, in the middle of the Tang Dynasty, Chengdu people would invent "water-grained paper", which can be divided into two kinds of printing. , So it is called "Chuan Paper".

Thanks to this, Jiaozi, the earliest paper currency in Chinese history, first appeared in Sichuan and slowly spread out later!

At first, people didn't take banknotes to heart at all. They were just used as stubs, which felt very easy to carry. Later, when they found it was easy to use, they began to use them for transactions, and Jiaozi was gradually promoted.

In the Southern Song Dynasty, because the water-grain paper specially used to make Jiaozi was not available in Sichuan, the paper was printed in Jianghuai area. However, Jiangnan Paper does not have the special anti-counterfeiting capabilities of Sichuan Paper, so a large number of counterfeit currencies appear on the market. At that time, there were more counterfeit coins in Jiaozi, Guanzi, and Huizi issued by Jiangnan than real coins. The severe penalties could not stop the counterfeiting of banknotes. This directly caused the economy of the Southern Song Dynasty to fall into a quagmire!

Therefore, the water-grained paper used to produce banknotes is a very critical anti-counterfeiting method!

"Chubark? Master, why do you have to make paper from Chuanbark?"

Uncle Fu nodded his head again and again, but finally couldn't help asking.

Li Zexuan replied: "Fu Bo, this paper made of bark not only has better toughness than ordinary paper, but also has a better hand feel!"

Uncle Fu nodded in disbelief, and then felt a little strange, "Master, what are you doing so much for making water-textured paper?"

Blame him for only caring about technical issues and ignoring the purpose of Li Zexuan's move.

Li Zexuan smiled mysteriously and said: "This Fu Bo, you will understand later. In addition to the water-textured paper, there is one more thing that needs to be done by Fu Bo to arrange manpower to do it as soon as possible!"

"Master, please say!"

For Li Zexuan's creative ability, Fu Bo had already developed immunity, so he didn't make a fuss about asking.

Li Zexuan paused, and then said: "Fu Bo, you recently thought of a way to refine a slightly softer steel by controlling the carbon content in the steel. I plan to use this steel to make an engraving board and gravure. Carving board! After this kind of steel is refined, let Master Liu paint the carving patterns I gave him on the steel plate, and I will carve it myself when I turn back!"

Gravure printing, abbreviated as gravure printing, is a traditional method of modern banknote production. In the 21st century, countries around the world still generally use gravure printing to produce banknotes. The inking part of this printing plate is concave. The printing plate is in direct contact with the paper surface during printing. Under strong pressure, the ink in the concave pattern is directly transferred to the paper. The ink appears three-dimensional on the paper. Touch it carefully with your hands. There is a feeling of unevenness.

On modern RMB, two characteristics of gravure printing can be easily found, one is thick ink layer and strong hand feeling; second, it has a strong three-dimensional effect.

Gravure printing is the ultimate method Li Zexuan set for Tang Yuan’s anti-counterfeiting. He does not believe that there is such an advanced printing technology in the world today!

More importantly, the master plate used for gravure printing is hand-carved. Hand-carved has unique anti-counterfeiting properties, because each engraver’s work has its own personal style and characteristics, and it also has a certain degree of contingency. This is something that others can't imitate, including he himself can't carve a carved plate exactly like the previous one!

Although there are many advanced copying techniques and counterfeiting methods in modern society~www.readwn.com~, they cannot copy banknotes exactly like hand-carved works.

With such a three-pronged approach, Li Zexuan can be said to block all those who wish to imitate banknotes!

Although Fubo had never seen gravure engraving and gravure printing, he could guess what Li Zexuan wanted to do literally only. After a moment of thought, he nodded:

"Okay! At present, the workshop can already produce steel. The kind of mild steel that the master said should be fine!"

Li Zexuan let out an "um" and then got up to leave.

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