Under the action of hydraulic force, the screw is constantly squeezed downward, and wisps of golden clear oil flow out from the cracks of the iron plate, flow to the oil tank under the oil press, and flow out from the small mouth on the side of the oil tank, and flow into the wooden barrel.

"Out of ...... It's oily! ”

Compared with the calmness of others, the workers in the oil mill were all speechless by the scene in front of them, and their eyes widened, staring at the oil that was constantly flowing, and their expressions were only shocked.

Staring intently at the oil press, Sun Erhu didn't even dare to breathe, he entered the oil mill as an apprentice since he was 10 years old, he is no stranger to oil extraction, oil extraction is hard work, hard work, and people can lose two pounds of oil squeezing.

But the clear oil that is constantly flowing out now completely subverts his understanding. He even glanced at the brake bar at his feet.

Just push it and the oil comes out?

Staring at the screw that was constantly rotating under the impetus of the water, Sun Erhu, like everyone else, muttered in disbelief and amazement.

In fact, Song Qiyu's situation was not much better, and he was also in shock. Under the squeeze of the hydraulic rotation of the screw, the four-foot-thick material tray was squeezed dry with the oil, leaving only more than two feet high, when the material tray could not continue to fall, Sun Erhu on the side, hurriedly pulled down the brake rod, and the axle disc transmission immediately stopped.

"Out of ......"

Originally, I wanted to drink the number Sun Erhu as in the past, but as soon as I opened my mouth, I realized that I didn't even see sweat on my body, and a dragon oil came out.

The oil that used to take two hours to make out now comes out with a sip of tea.

"This—this...... The oil just came out? ”

Song Qiyu looked at the wooden barrel that was already filled with oil in shock, and he even blinked his eyes deliberately, after all, the oil came out too quickly.

"It's out."

Responding casually, Shi Yiwen said to himself again.

"The efficiency of the single screw machine seems to be quite high."

This is a vertical single screw oil press. Historically, it was not until the 1600s that the manual vertical screw press was invented. This simple manual oil press was the first modern oil press, which was introduced to China in the mid-to-late 19th century. Until the 21st century, it continues to be used in some remote areas of China.

The current vertical single-screw oil press is not manual, but with the help of hydraulics, it works faster. However, it only took a few minutes to complete the squeezing of 400 catties of raw materials.

"How much oil is squeezed out?"

As the workers weighed the oil, Shi Yiwen asked loudly.

"59 catties and 7 taels, the owner, this machine has almost squeezed out nearly five percent of the oil!"

In the surprise shouts of the workers, Song Qiyu asked rhetorically.

"A lot?"

"Well, in the past, even half of the oil could not be squeezed out, but now the oil yield is almost equal to two times."

Shi Yiwen replied with a smile.

"That's so much extra oil!"

With his eyes wide in surprise, Song Qiyu looked at Shi Yiwen and asked.

"I understand, this machine of yours uses the same raw materials to squeeze twice as much oil, and the cost of oil will naturally drop, but how do I calculate it, it is still higher than the price of butter."

Looking at the puzzled Song Qiyu, Shi Yiwen walked to the oil drum and said to him.

"Ziyu, what is the difference between the oil in this barrel and ordinary oil?"

"Different?"

Walking to the barrel, Song Qiyu noticed that the oil in the barrel was darker red than other oils.

"It's ......"

At this moment, the oil cake that was squeezed dry in the material frame was taken out, and looking at the dark brown oil cake, he wondered.

"Zhiyuan, could it be that your raw material for oil extraction is not an ordinary oilseed?"

Smiling slightly, Shi Yiwen spit out two words.

"Cotton."

"What? It's actually cotton! Cotton seed oil extraction not only produces less oil, but also takes time and effort......"

Before he finished speaking, Song Qiyu swallowed the words back, it was time-consuming and laborious, it was in the past, the oil press made of iron lumps in front of him was not only not time-consuming, but it was squeezed faster and produced more oil.

"In the past, cotton oil extraction was indeed time-consuming and laborious, but with a hydraulic oil press, not only more oil, but also fast, of course, this involves a small pre-processing process."

When leading Song Qiyu to the shed by the river, Shi Yiwen said as he walked.

"The raw materials in the factory are not enough, and I am also anxious, but in the purchase of butter, it can't help much, so I went to the oil mill to inquire, the cheapest oil is cotton seed oil, because cotton is almost not worth a penny, a stone of soybeans costs 5 yuan silver, but cotton is not worth a penny, but even so, it is rarely used to squeeze oil, Ziyu knows why?"

As a son of a businessman, Song Qiyu also knows something about this. Cotton seeds are a by-product of cotton production and are of little use at all.

"It's not because the cotton seed oil tastes sour, but because the shell is hard and difficult to solve, the oil output is too low, a hundred catties of cotton will produce 5 catties of oil at most, and the oil mill is tired for half a day, and dozens of catties of oil will be squeezed out, the raw materials are not valuable, but the labor is not cheap, but even so cotton seed oil is also the cheapest oil, but it is still more expensive than butter."

As soon as the front foot entered the shed, Song Qiyu said "ah", and what caught his sight was the appearance of the four sets and the dust bellows in the oil mill were similar to the things that were placed in a row, driven by the water shaft belt, the workers were pouring cotton seeds into the four "bellows", accompanied by a piercing "whoosh" sound, the mouth of the box kept spitting out cotton husks, and piles of cotton kernels fell in the dustpan under the box.

"It's ......"

"Hull remover!"

Shi Yiwen grabbed a handful of cotton and said.

"Why cotton seeds used to be worthless waste, is because the cotton shell is too hard and difficult to break, the linter on the shell absorbs oil, naturally can not produce any oil, now the cotton shell is peeled off, this oil is naturally more, as long as this shell is broken, all natural problems will be solved......

Throwing the cotton seeds back into the bag, Shi Yiwen smiled proudly.

Although cotton seed oil was used in ancient China to extract oil, cottonseed oil has not been widely used, in the final analysis, because of the hard shell and the short linter on the shell, but it is extremely difficult to shell cottonseeds with good elasticity and toughness. It wasn't until the mid-19th century that cottonseed was invented with the hulling machine for oil extraction.

The principle of the cottonseed shelling machine is very simple, it is a kind of knife plate shelling machine, the core of the shelling is the drum and the knife base, when the cotton seed enters the shelling machine, the cotton seed will break the shell under the rotation and shearing of the knife plate seat, and when the shell falls, under the blowing of the wind blade, the gentle cotton shell is blown out, and the kernel falls into the dustpan below.

However, unlike the electricity used by the shelling machine in later generations, the water power provided by the waterwheel is used to drive the shelling machine here.

"This—that's the shell removed......"

Looking at the pale green cotton in the dustpan, Song Qiyu looked very surprised, just a few things turned worthless things into valuable raw materials.

"That's right, but, you just put it here, not afraid that others and others will steal your method?"

As soon as the words came out, looking at Shi Yiwen, who was smiling and silent, Song Qiyu said.

"I'm afraid Zhi has already been prepared, I look at its shell, it doesn't seem to be wood."

The oil press can not be kept secret, but the cotton shelling machine cannot be kept secret, because it is directly related to whether you can buy cotton at a "garbage price". Some technologies can be kept secret because they are too simple, but some technologies must be kept secret even if they are simple. Even for the sake of secrecy, Shi Yiwen deliberately used a thin steel plate fixed with anti-theft screws as a shell.

Outsiders want to get it, unless they put it all together, but they want to move it away secretly...... It's not easy! What's more, there are expansion screws up and down the bracket to fix.

Looking at Shi Yiwen, who was smiling and silent, and then looking at this oil mill that had nothing to do with the Song family, Song Qiyu suddenly realized a problem.

Seem...... He is getting farther and farther away from the Song family!

When this thought appeared in his heart, he suddenly felt that Shi Yiwen had become a little strange.

It's not just because he completely got rid of the Song family after having this oil mill now, but because he didn't even say hello when he was doing all this.

Thinking of this, Song Qiyu's mind suddenly became complicated, and even gave birth to some strange emotions.

But after a moment, he looked at the sheller and said with a smile.

"Zhiyuan, since cottonseed oil is so cheap, in my opinion, we can consider setting up a bigger oil mill, which is a profitable business."

Song Qiyu, who was born in a merchant family, immediately saw business opportunities from the oil press and shelling machine, cottonseed oil can not only be used to light lamps but also eat, so that thousands of households can not do without things, is the easiest business to do, of course, the profits are also extremely rich.

"There's no need for that right now. The most important thing at the moment is to expand the sales of soap, but the problem of raw materials has been solved. Then shop the goods along the river. ”

Shi Yiwen's refusal made Song Qiyu's heart stunned, and he said quietly in surprise.

What Zhiyuan said is that now is indeed the time to do a good job in this business. As for the rest, I'll wait until later. ”