The production of jars is generally made by pressing. Most ceramic factories have special gypsum molds. Just place the clay in the mold, use rotating machinery to quickly press out the shape, and wait for the shade to dry.

When Zhao Yunxiang was a technical school student, he would work in a nearby factory during the summer vacation. He used to work in a ceramic factory and was quite familiar with the making process of ceramics.

However, he had no molds and no dedicated machinery here, so he could only use his hands.

The dark red soil is very special, and there are basically no impurities found. Zhao Yunxiang still pressed the soil into pancakes with his fingers bit by bit and then checked.

The clay that makes up pottery must not contain impurities, and larger gravel must be picked out, otherwise cracks will appear during the drying process, and signs of explosion will appear after firing.

After some screening, a large amount of gravel and a dozen earthworms were screened out from the dark red clay weighing several kilograms.

It turns out that earthworms like to move in damp soil, and even in this kind of clay with high viscosity, traces of these creatures will be found.

The remaining clay is being beaten and pressed by Zhao Yunxiang, which is to further make the clay more delicate and tight, thereby improving the quality of the pottery.

A few minutes later...

Several clay pots were made, and these dark red clays were still very fragile and would be squeezed out with a little force. The fragile clay mud needs the next step of drying.

The so-called yin drying means that it slowly drys in a dark environment without contacting sunlight and dry air. This method can effectively remove moisture from mud, and will not cause signs of cracks in mud due to the rapid loss of water.

The place where the shade was dry was a thatched hut. This thatched hut was Han Xuening's residence. Because she temporarily left the tribe for a few days, the thatched hut was freed.

Only after placing the mud in the thatched house to avoid sunlight did Zhao Yunxiang leave with satisfaction.

The amount of dryness must take more than an hour, and he cannot control the specific dryness.

The construction of the kiln is still continuing, and several primitive people are sweating profusely because the sun is gradually rising, and the fire is on the bottom of the kiln, and the surrounding temperature is more than 40 degrees.

"If you can't stand it, just replace it and drink water to cool it down." Zhao Yunxiang cherished these labor forces very much and immediately directed a few people to drink water under the tree, and he quickly replenished it.

The kiln was already piled up to half a meter high. Zhao Yunxiang deliberately left an opening on the side of the kiln because the kiln manufacturer became narrower and narrower as the kiln manufacturer went up, so that the temperature inside the kiln could be maintained.

But a larger opening must be left because the things in the kiln are relatively large, just like the jars just now, with a height of half a meter and a diameter of 40 cm.

The opening left by Zhao Yunxiang was very large, an opening half a meter square. From here, the clay that needs to be fired can be placed in. Because it does not have the ability to make door shafts, it can only be sealed with mud and stones when firing pottery.

"Or it is possible to make a door shaft and fire it together. When I take out the pottery, I will use the pottery to make a door shaft to create a dirt door that can be opened and closed." Zhao Yunxiang thought roughly for a while and then began to make a door shaft.

The so-called door shaft is carried out by the rotation of the bearing. Zhao Yunxiang did not intend to make the bearing with mud, but made two things similar to small plates.

There is also a cylindrical mud stick. Four mud strips extend from one side of the mud stick. At the same time, four mud strips cross together with these, forming a grid.

These are the materials that make up the door shaft. Small plates can be installed on the upper and lower layers of the kiln opening. Cylindrical sticks are stuck in the small plates. The soil grids extending to one side are the frames of the soil door.

With this frame, it is easy to cover the soil.

The made things were placed on a few leaves, and the soil grid was very fragile. Zhao Yunxiang simply stopped drying the clouds and put them carefully into the kiln to let them burn directly.

He didn't have much hope for this device. These grids are very fragile, and it is normal to have cracks and breaks, but it doesn't matter, as long as the cylinder is fine.

Half an hour later, the kiln was completed!

The huge kiln is more than 2 meters high. When it comes to it, Zhao Yunxiang directly built a cone shape to make the chimney of the kiln.

"Is this the kiln?" Lin Hao's face turned red with a hot face. He was drinking water from the cool bread tree wildly.

"That's right, this is the kiln. After the firewood burns, the furnace temperature has risen!" Zhao Yunxiang saw the fire snake gushing out of the gap in the furnace strip through the huge opening.

The furnace strip that Zhao Yunxiang had always been worried about did not collapse, but became harder and harder after the burning of the flames.

As long as the temperature of the kiln reaches the standard, after a few hours of burning the flame, the body of the furnace will become very hard and even partially ceramicized.

"How long does this take to be cooked?" Lin Hao continued to ask, "Is the firewood we have found enough?"

There are a lot of firewood, but it is still not enough to use it to fire the kiln. The main reason is that the kiln is too large, and this kiln consumes a lot of firewood.

The temperature after the firewood burns is only more than 800 degrees, which can barely meet the standards for firing pottery, but it is far from enough to smel metal.

"The firewood is enough for the time being. You have to control the temperature and control the time when making pottery!" Zhao Yunxiang smiled. He had a clock that controlled the time, and the round clock on the ground could accurately mark every hour.

The furnace is almost fired, and the surface of the furnace is invaded by high temperature. A layer of white cloud-like substance appears on the soil, which is saline and alkali in the seawater.

After all, the kiln itself is made of mixed loess and seawater. After evaporating the moisture at high temperature, all the remaining saline and alkali are left.

Looking at the salt and alkali, Zhao Yunxiang fell into deep thought, "Maybe he can use the kiln to distil the sea water and get some sea salt to eat."

Salt is the most common and indispensable one among condiments. Any food will become delicious as long as it is added with salt.

There was still a lot of sea water brought by the tribe, all of which were placed in a huge wooden basin. Zhao Yunxiang used leaves as containers to pour the sea water inside, and then placed the leaves next to the kiln.

The kilns have been completely heated up now, with the surrounding temperature reaching more than 50 degrees. This temperature can completely put the mud in and then heat up.

Put all the slightly dried mud into the kiln, and then use mud and stones to seal the opening of the kiln, so that the kiln is basically sealed and can heat up quickly.

After finishing all this, Zhao Yunxiang deliberately looked at the clock. It was around 11 o'clock now, and the shadow of the wooden stick was very short, and it would be almost an hour before 12 o'clock was marked.

"11 o'clock..." Zhao Yunxiang touched his chin and thought, "If it takes 6 hours, it will be about 5 o'clock in the afternoon."

Just as Zhao Yunxiang was muttering to himself, the tribes who were enjoying the shade under the tree began to shout, "It's King Kong and the others who are back!"

"King Kong?" Zhao Yunxiang is familiar with this name, "Isn't it the number one beauty of the tribe that Han Xuening mentioned?"
Chapter completed!