Blacksmithing takes a long time, but carpentry is different.

The wood nuggets that Li Mengxi needed to imitate the shape of a Rubik's Cube with a charcoal structure were quickly completed by the carpenters.

The first wooden block was made by the carpenter who drilled holes in the wooden boards and then glued the wooden boards together with fish glue to form the shape.

The finished wood knot is very ugly, and there are not many holes. There are only a few holes, but it fully meets the requirements.

After getting the piece of wood, Li Mengxi took the wood back first because his younger brother Xiao Zhuan was still in class.

In the City Lord's Mansion, Guan Yu was cooking a new pot of paper pulp. The pressure cooker was placed in the middle of the room, and the firewood was burning fiercely.

Li Mengxi had great distrust in the quality of the pressure cooker. He was afraid that it would explode if burned without leaving any trace. Li Mengxi walked around the wall and walked into the house.

When he got to the house, Li Mengxi found a large wooden basin, then took a bucket to bring a lot of water to fill the wooden basin.

Then, I took a piece of wood and looked at it. The holes in the piece of wood were about the size of peanuts, not too big or too small.

After thinking for a while, Li Mengxi found another mess, pulled out the flax silk from it, and then twisted the flax silk randomly into a small ball of thread smaller than a peanut.

After wrapping thirty similar small balls of thread, Li Mengxi threw all the balls of thread into the water.

Next, simulating the process of charcoal adsorbing pigment particles, Li Mengxi threw the twine balls and wood clumps into the water, and then he moved the two sides of the wooden basin and shook it wildly.

The wooden basin was filled with water, and the weight was so heavy that Li Mengxi struggled to nurse.

The room was very quiet. Guan Yu was reading quietly. When he heard the noise made by Li Mengxi, Guan Yu looked over and saw Li Mengxi playing with water again. Guan Yu laughed.

Li Mengxi swayed the water in the wooden basin around. Finally, a ball of twine happened to pour in through the holes in the wood.

Moreover, because the hole is twisted and twisted, the twine ball cannot come out when it goes in.

Li Mengxi reached out and picked up the lump of wood and looked at it. He saw that the ball of twine that had been poured in was stuck in the hole, and it was stuck very deep.

He found a small stick and pulled for a long time, and successfully pulled out the twine ball.

Then, Li Mengxi became interested in the wood and stopped playing with it.

In fact, a wooden basin, a basin of water, some twine balls, and a wooden knot with holes. Although these props are simple, they can fully simulate the process of carbon adsorbing pigments. If Li Mengxi wants to study the deeper secrets of activated carbon, he Wooden knots should be studied seriously instead of being thrown away as a boring toy.

Perhaps, just as Li Mengxi looked at himself, Li Mengxi felt that he lacked imagination and did not have enough curiosity about all things in the world. He believed that he was not suitable for scientific inquiry.

It is also true that the purpose of doing a lot of tests recently is not for exploration, but for technology, just for utility, and not to explore the unknown.

There was no longer Li Mengxi shaking the pot, and the room became quiet. After a while, Li Mengxi called out to Guan Yu, who was fascinated by the bamboo slips. He shouted, "General Guan, the firewood is finished!"

Hearing the sound, Guan Yu raised his head and took a look. Guan Yu saw that the firewood under the pressure cooker had already been burned out. Guan Yu glanced at Li Mengxi who was doing nothing next to him. Guan Yu said to himself that since he would not help add firewood when he was idle, he had to call someone.

?

Putting down the bamboo slips, Guan Yu said, "No more cooking. Maybe it's time."

The pulp has been cooking for almost a morning, which should be enough time.

There is a question. The efficiency of the pressure cooker is very overbearing. It takes a day or two to cook the pulp in an ordinary pot, but the pressure cooker can finish cooking it very quickly. So, how long does it take to cook a pot of pulp? Calculating from the beginning of heating, how long does it take for the pulp to be fully cooked?

good?

Assuming that the pulp is cooked in two hours, there is no need to cook it all morning, because cooking for a long time is too wasteful. Dye consumption is one of the main costs in the papermaking process. The heating time can be accurately controlled, and the dye can be

The cost is reduced several times.

To find out what the heating length is just right, this problem is easy to solve, it is still a test.

The first time, only heat it for half an hour, then open the pot to see if the pulp is cooked.

The second time, make another pot, this time cook for an hour before opening the pot, and then check whether the pulp is cooked.

The third time was one and a half hours, and the fourth time was two hours.

In this way, after multiple tests and increasing time, the accurate heating time can finally be determined, with a time error of no more than half an hour.

This is the test method, but Li Mengxi didn't have time to try it, and he didn't think it was necessary to try it.

Because it is not mass production yet, when we get a huge iron pot to produce paper pulp in the future, it will only make sense to precisely control the heating time.

When the pot was about to be boiled, Guan Yu went over with a hammer and chisel to smash the iron seal. Li Mengxi saw this and ran away to hide.

Guan Yu knocked on the iron seal a few times, chirp - the iron seal broke open, high-temperature steam shot out immediately, and a stream of white steam shot straight up.

Every time I open the pot it is so thrilling.

After a while, when the steam was exhausted, Guan Yu cut open all the remaining iron seals.

Li Mengxi came over, and Guan Yu turned around and said, "Xi'er, the pot is going to break."

Li Mengxi came closer to take a look, and he saw that the edge of the pressure cooker lid might have been cracked because it had been smashed too many times.

This may have something to do with the way of sealing and unsealing. When sealing a pressure cooker, you need to pour molten iron around the edge of the pot, and then bang it hard with a hammer. This process is actually equivalent to welding. Use molten iron to connect the lid and the pot.

The pots came together.

The entire technical process, from sealing to opening, requires the use of a hammer, and the operation is very violent. Now the lid of the pot is broken, which is expected.

Li Mengxi calculated that this pressure cooker has been used for less than ten days and less than ten times since it was manufactured. It is broken and its service life is too short.

Li Mengxi spent a few seconds thinking about how to improve it. Since the pot lid is easy to be broken, it is simple. Make the pot lid thicker. If one finger is not thick enough, make it two fingers thick. If two fingers are not enough, make it three fingers thick. Three fingers thick.

If it's not enough, just make four fingers. If it's not strong enough, then replace it with steel, use the steel filling method, use a steel-clamped pot lid, use a steel-wrapped pot lid, and then make the pot lid into an arch like a turtle shell. In this way, it will be strong enough.

Well, it can last for a year without breaking.

This chapter is not finished yet, please click on the next page to continue reading the exciting content! Damn it! Li Mengxi’s idea of ​​improving the technology of pressure cookers is just to change the lid. He only focuses on changing the lid without optimizing the overall structure.

For example, change the sealing method or something.

Maybe, the pot lid is easy to change, but the sealing technique is too difficult.

——

After the new pot of paper pulp was cooked, Li Mengxi and Guan Yu looked around the pot for a long time. Guan Yu said seriously, "This paper pulp is cooked well."

Li Mengxi also nodded seriously, "Yes, it's cooked well."

What’s funny is that Guan Yu and Li Mengxi have only been exposed to papermaking for a few days. Their eyesight and experience are not enough to support them in judging the quality of paper pulp at a glance.

Isn't it funny that two people who don't understand act seriously?

After testing yesterday, it was found that Willow charcoal and Dengcao charcoal had the best color absorption effect. Li Mengxi took the two charcoals that had been prepared earlier, wrapped the charcoal with burlap, and then dropped the stone on it and sank to the bottom of the pot.

The method of wrapping charcoal in linen and tying stones to sink it to the bottom was another improved method devised by Li Mengxi.

The purpose of wrapping linen cloth is to prevent the crushed charcoal from being mixed into the pulp. This inspiration comes from the seasoning packets placed when braised pork. The stone is dropped because the charcoal is too light and cannot sink to the bottom. It can only float on the surface and cannot remove color from the deeper layers of the pulp.

Tie a stone and sink it into the pulp.

If these two methods were thought up by others, they would be worth dozens of kilograms of grain as rewards, but if Li Mengxi came up with them himself, they would be worth nothing.

After that, it was a long wait.

Li Mengxi knew the decolorizing effect of charcoal very well, and he knew it would definitely work. But Guan Yu was different. Guan Yu was very curious. He stood by the pot and stared at the pulp in the pot without blinking.

A few minutes later, Li Mengxi came over, picked up the old charcoal, replaced it with new charcoal, and continued to remove the color.

Anyway, if you have enough work materials and enough time, the more charcoal you add and the more times you add, the more thorough the decolorization can be.

After a long time and after changing several batches of carbon blocks, the decolorization was completed.

After that, the pulp is copied and dried, and the paper making process is completed in one go.

The paper is ready. This time, the paper is made with willow charcoal, lamp grass charcoal, and is very white in color.

Li Mengxi felt that the whiteness of this paper was the whitest among several tests.

Comparing the newly made white paper with the white paper made last time, it proves that the feeling is right. The decolorization effect of willow charcoal is very good. This time the paper is one degree whiter than the last time.

The paper turned white day by day at an extremely fast speed, and Guan Yu was extremely excited.

Li Mengxi was thinking that although willow charcoal has a much better decolorizing effect than ordinary charcoal, willow charcoal is still just ordinary charcoal and is still different from real activated carbon.

So, what is the difference between activated carbon and ordinary carbon? What is the difference between activated carbon and activated carbon? What is the meaning of activated carbon? How is the activated charcoal activated? Bacteria are added? Fermentation is added? Catalyst is added?

I can't understand.

When he couldn't understand, Li Mengxi was just depressed. Li Mengxi's requirements for the quality of paper were too high. No matter how big the problems in papermaking were and how many problems still needed to be solved, in fact, at this step, he could produce white paper.
Chapter completed!