Sending Yu Shicun downstairs, Xu Yi turned around and came back, ready to pack up and go directly to the food market. There are more things to buy in this place, and it is absolutely impossible to get all the things in one thought, but I am afraid that I will have to make a few trips before I open it.

However, after going out, Xu Yi did not go directly to the subway station, but walked along the street.

He brought his passbook and ID card to the bank, which had just opened, and there were many people lined up for both personal and corporate business. Xu Yi didn't want to withdraw money, he didn't want to waste time waiting here, so he simply found the lobby manager directly, showed his passbook and ID card, and registered his phone number to make an appointment to come and withdraw money tomorrow.

The money he withdrew was still not very much, and he was only going to take out 100,000 yuan, which should be enough for the expenses of this time, as for the ordering system or building a house or something, it was still calculated through bank transfer.

Xu Yi put the passbook and ID card in his pocket, put away his things directly, and took the subway to the food market.

Halfway through, Lin Sha made a phone call.

said that the materials could be delivered to the restaurant at about half past nine in the evening, so that Xu Yi must wait here along the river at that time, and then they have almost sorted out the documents, and everyone will meet again tomorrow morning, and then the contract will be officially drawn up.

Xu Yi is naturally full of promises, and this matter is still done early.

After turning around, Xu Yi walked to the store called Tongda Soybean Products Processing Equipment Distribution Office where he bought the electric mill last time, and the water mill he bought later looked at the price on the Internet, which was fair, and even if the freight was counted. The stone mill you bought yourself is much cheaper. So Xu Yi doesn't mind being a repeat customer again.

I saw Xu Yi come in. The boss, who looked to be in his forties, smiled and asked, "Young man, what do you want to buy today?"

Xu Yi remembered that the business card given to him by the boss was called Kong Wanxiang, so he also smiled at the boss and nodded, and asked: "Boss Kong, I want to see the stone mill, what kind of stone mill with the highest fineness you have here?"

Kong Wanxiang asked with a smile: "Does the slower processing speed affect you a lot?"

Xu Yi wanted to buy a stone mill that could process tea powder, and the first thing he considered was the problem of granularity, and the problem of processing efficiency was not in his consideration at all.

Tea powder is just a very small amount of ingredients. No matter how much more can be used, the processing efficiency will naturally not have much impact on him?

Of course, Xu Yi was naturally ready for a long time, and he said with a smile: "I want to put this at home, isn't stone-ground flour and stone-ground soy milk popular now?"

"That's right. ”

The biggest feature of stone mill is low-speed and low-temperature grinding, which can avoid the high temperature generated by the high-speed rotation of the electric mill and the result of excessive temperature in the flour processing process and destruction of the flavor substances in the flour. By retaining the activity of various substances such as vitamins in the wheat milling process to the greatest extent, the texture and taste of the flour produced can be improved.

This is one of the big selling points of stone-ground flour.

However, unlike dry flour grinding, even if it is produced by a water mill or a soymilk machine, there is no problem, and inefficient stone mills are of little value.

The specific heat of water is high, and the amount of water used in the processing process causes the heat generated by the grinding process to not increase the temperature of the soybean milk much. It leads to the destruction of the substances in the soy milk.

However, some unscrupulous merchants will also use the above statement to mislead consumers:

"The protein structure of soybeans is a complex winding chain structure, and the instantaneous high temperature and high pressure generated by electric machinery during processing and high-speed cutting destroy the protein structure of soybeans. It also destroys the original flavor of soybeans, and the stone mill rotates slowly and relies on squeezing. Grinding to crush soybeans can most effectively retain the original flavor and nutrients of soybeans, which is the fundamental reason why stone-ground soybean milk is rich in nutrients and rich in bean aroma compared with ordinary machine-made soybean milk, and is loved by men, women and children. ”

"Tofu itself is rich in nutrients, containing iron, calcium, phosphorus, magnesium and other essential trace elements for the human body, as well as vegetable oil and rich high-quality protein, known as 'plant-based meat'. The traditional processing technology - stone mill runs evenly and slowly, and the soybean milk produced is both uniform and fine, allowing soybeans to fully release protein, and the unique minerals contained in it are naturally mixed with soybean nutrients. The tofu processed by stone grinding has a soft, tender, white as snow, long-boiled and long aftertaste. ”

There is also a big problem with this statement, and it can be said that in these statements, except for some of the advantages shared by soybeans are true, everything else has certain problems.

First of all, the protein in soybeans is globulin, which is a round pie shape that is held together by a different number of globular globular polypeptide molecular chains. Changing to a chain-wound structure just makes people feel that this protein molecule must be very fragile and easy to be torn apart, so as to facilitate the later rhetoric.

But no matter how large the soy protein molecule is, it is not enough to be really destroyed by ordinary electric machinery, so this is still nonsense.

If the crushing performance of ordinary water mills is so good, even if Xu Yi needs to grind at low temperature, then where can I buy a stone mill, just find a way to reduce the speed of the motor to grind tea powder!

It is said that the fineness of the water mill screen is about 90 meshes, and the maximum particle that can pass through is only 1670 microns.

If you look at it this way, most of the solid particles in the soy milk are more than 100 microns. Generally speaking, the molecular size of naturally occurring proteins is generally between 20 nanometers and more than 100 nanometers, and soy protein unfortunately does not belong to the largest group of proteins, and the size of a single molecule is only more than 20 nanometers.

There is only one micron in a thousand nanometers, and with such a small molecule, how can you expect a lot of damage in such a crude civilian ordinary machining process?

Where is it so easy!

Not to mention the protein molecules calculated by nanometers, even pollen between 30 and 50 microns in diameter have to be ground with a high-frequency ball mill to achieve the effect of breaking the wall.

However, even a machine with such a high processing fineness such as a ball mill has a problem with a low wall breakage rate for such small particles as pollen, let alone such a small protein molecule.

In the case of this stone mill and ordinary water mill dry mill, there may indeed be a significant increase in temperature caused by the rotation speed, resulting in the denaturation of starch or protein.

However, there is no temperature problem in this water mill processing, and there is any essential difference between the stone mill and the electric mill?

This soybean milk is processed by water milling, and there is basically little impact caused by temperature rise. If the grinding process will destroy the protein molecules, wouldn't it be even more destructive if it is boiled?

How can it reach the level of affecting the taste and taste, so how to cook this soy milk, isn't that more impactful?

In other words, if you can really destroy protein molecules with a stone mill, then what kind of "garbage" is hydrolyzed protein, and how good it is to simply use physical processing to process everything, which can also avoid chemical processing methods "destroying nutrients" and "residual compounds causing harm to the human body"...... These are nonsensical claims.

It is also said that the stone mill made of sandstone and other materials will dissolve or wear out during the grinding process of soybean milk or flour, resulting in the minerals and even stone powder in the rock will be mixed into the soybean milk or flour to supplement the necessary trace elements of the human body.

Under normal natural conditions, heavy metals in water and soil are basically obtained from the weathering and water erosion of the rocks that flow through.

If this stone mill is really so easy to replenish trace elements, then unfortunately, this thing will also easily replenish heavy metal ions.

Artificial additives used routinely must be tested to determine the overdose before they can be used normally, so as not to add too much will cause harm to the ingredients or the human body, which depends on. It is said that this stone mill has a wear-resistant property, which is naturally difficult to say how much this can come down, the main component is silica, whether it is a stone mill of quartzite or sandstone, can you guarantee that it does not contain heavy metals or harmful elements at all?

Fortunately, one of the major selling points of stone grinding is that it has a low rotational speed and is durable, so the wear resistance of this thing is quite good. Even so, if a stone mill made of sandstone is used, it can often lead to more sand in the flour, which in turn reduces the taste.

Unless it is an empty grinding, there will not be too much stone powder to be grinded down, and it will not be so easy to dissolve in water, so the stone grinding will not have much impact on food in terms of safety.

In the same way, you don't have to expect any kind of nutrition from the ingredients in this stone!

Kong Wanxiang led Xu Yi to the store and walked a few steps to stop, bending down to open the lid of the wooden box next to him. said with a smile: "Then it has to be said that it is this low-noise and low-speed electric stone mill produced in Jin Province." This machine should be regarded as the highest processing fineness in my shop, if you process dry powder, it can basically reach a fineness of about 100 meshes, if this is processed twice, I think it should be able to reach about 200 meshes. ”

"However, the relative fineness of this processing is high, so the processing efficiency of this machine cannot go up, even if it is processing flour for an hour, it will process more than ten or twenty catties at most, which is much less efficient than the rice mill. ”

"Oh, that's inefficient enough. ”

"After all, this thing was originally sold to customers with special dietary needs, and there is really nothing wrong with it except for slow processing. ”

Kong Wanxiang smiled and took out a few photos on his mobile phone to show Xu Yi: "It just so happens that this is what I took when I was making tofu a few days ago, so I can show you, even I use this at home." There are no drawbacks other than taking up a lot of space. Whether it's rice flour or soy milk, the result is perfect. ”

Xu Yi looked at it, it was really Kong Wanxiang wearing an apron and working hard at the edge.

Kong Wanxiang put the phone on the desk, raised his finger, and said with a smile: "I remember you bought that electric mill last time, right?" (to be continued......)