Dol on the knife, or the terrible truth behind knives with “blood.” Does blood flow really make a knife a cruel killer? Many people ask why and what are they needed for? First things first
"Krovostok" on a knife- the topic is extremely popular, and in almost all conversations regarding knives, conducted on a variety of forums, the eternal question comes up: “What is knives with blood flow, and, frankly speaking, why blood flow Is this the one you need?"
This fundamentally erroneous term, as is known, means a special groove on the knife, or rather on his blade. But be prepared for the fact that for mentioning the word “bloodstock” on serious knife forums you will be beaten (maybe even kicked), since it is correct and correct to call this thing on the blade “dol”. And “krovostok” is vulgar jargon, unworthy of the speech of a kniffer, and all that. However, even on fairly serious knife forums, a variety of versions are being discussed about why this is actually needed. dol on the knife. That's what we'll talk about today...
From the point of view of the average person, a knife with a “blood filler” is a strictly required attribute of a terrifying fighting beast like director John Rambo - thanks to Hollywood. In fact, this is not true at all.
Fullers on the blade: "hunting" version
The first version (or rather, a group of versions under the general name “hunting”) regarding why we need fullers on the blade, says that supposedly this blade groove remained a legacy from the hunting knives of the Middle Ages. Like, if you leave a knife in the body, “blood flows down the bloodstream” from the animal’s carcass. In other words, hence both the name and the theory of application: knives with "blood" serve to bleed the victim.
Only representatives of the office plankton of large cities can fall for such a myth. Any person who has in one way or another been involved in rural areas and subsistence farming knows perfectly well that in order to quickly bleed a carcass, you simply need to hang it upside down and cut the neck blood vessels. But a knife left in a carcass will not leak much blood through a narrow groove.
The same applies to the alternative version of the hunting version about “blood flow during the hunt”: it seems that if a knife after a blow remains in the body of an escaped animal, then the success of the event depends on where exactly this blow was struck. Nonsense, because... if, say, the heart, spleen, liver or other organs of increased blood supply are affected, then, regardless of the presence of the blade on the knife, the animal will weaken from massive internal bleeding. And if you stick a knife into the muscle of a large enough animal, the animal will gallop away, and you will no longer see your knife, even if there are any number of gutters there. A wounded animal that is not large enough will, of course, weaken under the weight of the knife, but I strongly doubt that the groove on the knife was specifically introduced into the design of the blades for catching hares with bare hands. Be that as it may, it is to the hunting versions that we owe the appearance of the name “blood on a knife,” and it is precisely because of their delusional nature that knife experts dislike this word so much. But let's move on to other myths.
Blood on a knife: the theory, God forgive me, of “bodily vacuum”
The next version of the purpose of the valley appeals to physics, telling us about a “bodily vacuum” shrouded in mystery. It is mysterious for the simple reason that few of the adherents of this version themselves know what it is. Often on knife forums you can come across statements that the fullers on the blade are intended (I quote): “to allow air to escape from the body, so that the knife does not jam under pressure.” I confess that in surgical practice I have encountered “air leaving the body,” for example, in the case of fecal peritonitis, yyyy. True, such a situation does not imply any clamping of the knife in the wound. More experienced knifesmiths present a slightly modified version: they say that the groove on the blade supposedly serves to improve the reverse process, namely, the penetration of air into the body. It seems that in this way the internal vacuum of the body is broken, and the knife is not sucked into the wound due to the closing of the edges of the wound. At first glance, this is a plausible version, but... Well, the cavities of the human body are in no way capable of “sucking in to death” - not a compressor, for that matter. In addition, removing the knife will be no more difficult than inserting it, since the blade will simply cut its way back, even if the closed tissues stubbornly resist.
Some unique people firmly believe that the groove on the knife serves to conduct air into the body, but not at all to make it easier to remove later, but only to infect the wound with “outboard” air entering through the channel, the walls of which are flesh and the surface of the valley itself.
There is also a mixed version: they say that the notorious vacuum is created in the wound around the blade, and the blood flowing through the “bloodstream” eliminates it, which makes it easier to remove the blade from the victim’s body.
Shoulder on a knife: “technical” versions
There are purely technological options. For example, a groove on the knife reduces the overall weight. Of course, “minus fabric” makes it easier. And through holes make it even easier. Why is everything stuck in these grooves? Or that the dol not only makes it easier, but also changes the balancing of the knife. Twenty-five again: the classic fuller runs along the entire length of the blade, that is, it lightens evenly along its entire length. It is much easier and more effective to change the balance in other ways.
There are also options for simplifying the forging process in the presence of a fuller: supposedly the cutting edge of the knife during hardening heats up faster than the butt (the blunt thick part) and the fuller somehow evens out this imbalance.
Why blood flow? And for beauty!
There is also a banter version that the dol is done purely for beauty. And you know, recently the aesthetic function of the fuller has really become quite real: since public opinion recognized the “blood on a knife” as a lickable attribute of a “real cool fighting blade” (tm), individual manufacturers began to sculpt it anywhere with the sole purpose: please the consumer.
So what is a “dollar on a knife” really, and what purposes does it serve?
It's actually simple. The dol actually appeared on blades a very long time ago - back in the early Middle Ages, if not earlier. And its main purpose was and remains to increase the strength and hardness of the blade.
Everything is elementary: in this case, the principle of the so-called I-beam is used (aka double-T, aka I-beam, aka H-shaped) - a well-known ancient engineering technique in architecture. The name comes from the Latin "taurus" - bull. The cut profile of such a beam vaguely resembles bull horns connected together.
“An I-beam is a standard profile of structural elements made of ferrous rolled steel or wood, in cross-section resembling the shape of the letter “H”. An I-beam is approximately 7 times stronger and 30 times stiffer than a square profile beam of the same cross-sectional area.” (c) Wikipedia. It is precisely these steel I-beams, by the way, that are used in the process of skyscraper construction as a frame base.
In other words, metal of the same mass and total cross-sectional area, but cast in the shape of an I-beam, is much stronger in bending than monolithic. To verify this, it is enough to conduct an experiment: try to bend a monolithic strip of metal several millimeters thick. With a high degree of probability, by applying effort or pressing with your weight, you will bend the strip into an arc. If you try to do the same with a metal profile of the same thickness, but made in the shape of a “corner”, you are guaranteed to fail. Let the engineers correct me: the number of axes of the structure increases, due to which the strength increases.
Of course, the cut of the blade with the fuller does not fully correspond to the classic I-beam profile, so the figures for the increase in rigidity and strength are more than 30 times inferior to it. Nevertheless, the fact remains: a blade with a fuller in the design along the entire length of the fuller is stronger and stiffer than a blade without a fuller of similar weight and shape.
There is one thing: the longer the “product”, the more noticeable the effect of the I-beam profile, and therefore the fuller. That is, on swords, checkers, sabers, long daggers and bayonets, the fuller is vital to increase the bending strength of the blade...
Here, for example, is a German bayonet of the 1898/1905 model:
Full on the sword:
Dole on the dagger:
But the dol on some short-bladed knife with a “real hunting knife” (tm) angle looks like pure decoration, because why is it needed there.
But in general there is some kind of perversion, as for me: two fullers on one side of the blade.
Such are the things. So forget about it already
This topic is extremely pressing. In almost every conversation regarding knives on various forums, the age-old question comes up: “What is blood flow and why is it needed?”
The blood flow is understood as a special groove on the blade. But be prepared for the fact that for mentioning the word “blood” on serious knife forums you will be beaten (maybe even kicked), since this groove is correctly and correctly called “dol”. And “krovostok” is vulgar jargon, unworthy of the speech of a kniffer!
Nevertheless, even on fairly serious knife forums, a variety of versions are being exaggerated about why this bloody dol is actually needed. This is what we will talk about today.
In the opinion of the average person, blood flow is a strictly obligatory attribute of a terrifying fighting beast (thanks to Hollywood). In fact, this is not true at all.
The first version (or rather, a group of versions under the general name “hunting”) of the purpose of the bloodstream: supposedly it was inherited from the hunting knives of the Middle Ages, and if you leave the knife in the body, then “blood flows down the bloodstream” from the animal’s carcass. In other words, the bloodstream is designed to bleed the victim.
Only representatives of the office plankton of large cities can fall for such a myth. Any person who has in one way or another been involved in rural areas and subsistence farming clearly understands that in order to effectively bleed a carcass, you simply need to hang it upside down and cut the neck blood vessels. And a knife left in the carcass won’t leak much through the narrow groove!
The same applies to the alternative version of the hunting version about “blood flow during the hunt”, if the knife after the blow remains in the body of the escaped animal: it all depends on where the knife hit. If the heart, spleen, liver or other organs with increased blood supply are wounded, then, regardless of the presence of a groove on the blade, the animal will weaken from massive internal bleeding. And if you stick a knife into the muscle of a large enough animal, the animal will run away, and you will no longer see your knife, even if there are any number of grooves there. “An animal that is not large enough,” of course, will weaken under the weight of the knife, but I strongly doubt that the dol was specifically introduced into the design of the blades, counting on catching hares with bare hands!
It is precisely the hunting versions of the origin of the valley that we owe the name “bloodstock” and it is precisely because of their delusional nature that knife lovers dislike this word so much. But let's move on to other myths.
Another version of the purpose of the valley appeals to physics and talks about a mysterious “bodily vacuum.” Mysterious, because few of the adherents of this version know what it is. There are often statements on knife forums that the fuller is intended (I quote) “to allow air to escape from the body so that the pressure does not pin the knife.”
I admit, in surgical practice I have encountered “air leaving the body,” for example, with fecal peritonitis (gee-gee). This situation does not imply any clamping of the knife in the wound.
More experienced kniffers present this option: the dol supposedly serves for the reverse process - conducting air into the body. In order to break the internal vacuum of the body, the knife is not sucked into the wound when the edges of the wound close and tightly clamp the blade. At first glance, this is a plausible version, but... The cavities of the human body are not capable of “sucking in to death” - not a compressor because. In addition, pulling out the knife will be no more difficult than sticking it in, because it will simply cut its way out if the closed tissues create sufficient resistance.
Some freaks claim that the fuller is needed to conduct air into the body, but not at all in order to remove it easier later, but only to infect the wound with “outboard” air entering through the channel, the walls of which are the flesh and the surface of the fuller!
There is also a mixed version: they say that the notorious vacuum is created in the wound around the blade, and the blood flowing through the bloodstream breaks it, which makes it easier to remove the knife from the victim!
There are purely technological versions. For example, they say, the dol makes the blade lighter. Of course, “minus fabric” makes it easier. And through holes make it even easier. Why is everyone stuck in these grooves?!
Or that the dol not only makes it easier, but changes the balancing of the knife. Twenty-five again: the classic fuller runs along the entire length of the blade, that is, it lightens evenly along the entire length. It is much easier and more effective to change the balance in other ways.
There are also options for making forging easier if there is a fuller - they say that the knife blade (thin part) heats up faster during hardening than the butt (dull part), and the fuller somehow evens out this imbalance...
There is also a banter version that the length is needed solely for beauty. And you know, recently the aesthetic function of the fuller has really become real: since public opinion recognized the bloodstream as a “lickable” attribute of a “real cool combat knife,” some manufacturers began to sculpt it anywhere in the desire to please the consumer!
What is a debt and what is it for? It's actually simple. The dol actually appeared on blades a very long time ago, back in the early Middle Ages, and maybe earlier. And the main purpose of the fuller is to increase the strength and hardness of the blade.
It's simple: it uses the principle of the so-called I-beam (aka double-T, aka I-beam, aka H-shaped) - a well-known ancient engineering technique in architecture. The name comes from the Latin “taurus” - bull. The cut profile of such a beam vaguely resembles bull's horns put together.
“I-beam is a standard profile of structural elements made of black rolled steel or wood, having a cross-section close in shape to the letter “H”. An I-beam is approximately 7 times stronger and 30 times stiffer than a square beam of the same cross-sectional area” (Wikipedia).
It is precisely these steel I-beams, by the way, that are used in skyscraper construction as a frame base. In other words, a metal of the same mass and total cross-sectional area, but made in the shape of an I-beam, is much stronger in bending than a monolithic one. To verify this, it is enough to conduct an experiment: try to bend a monolithic strip of metal several millimeters thick. With a high degree of probability, with some effort or pressure from your scale, you will bend the strip into an arc. If you try to do the same with a metal profile of the same thickness, but made in the form of a “corner”, you are guaranteed to fail. Let the engineers correct me: the number of axes of the structure increases, due to which the strength increases.
Of course, the cut of the blade with the fuller does not fully correspond to the classic I-beam profile. Therefore, the increase in rigidity and strength is less than 30 times. But, nevertheless, it is a fact: a blade with a fuller in the design along the entire length of the fuller is stronger and stiffer than a blade of similar weight and shape without a fuller.
There is one thing: the longer the product, the more noticeable the effect of the I-beam profile, and therefore the fuller. That is, on swords, checkers, sabers, long daggers and bayonets, the fuller is vital to increase the bending strength of the blade.
dobroxot 12/24/2012 - 02:22
For example like this.
Or so.
After all, a knife with such notches actually becomes disposable - until the first sharpening. Because very often these recesses are located just a couple of mm from the RK. This is forgivable for inexpensive stainless steel knives that are used for cheese or boiled sausage.
slicem 12/24/2012 - 06:27
1. So that it doesn’t stick.
2. It’s strange when you sharpen knives that a full knife goes into one sharpening.
Whip 12/24/2012 - 06:29
dobroxot
Good night or maybe good evening to anyone.I have long been interested in why on Santoku knives some manufacturers make oval notches on the blades closer to the cutting edge, so-called “air pockets”?
These pockets (grantons) are designed to supposedly reduce the adhesion of the product to the surface of the blade. For vegetables, such depressions, in my experience, practically do not work. Perhaps the meat sticks less - there is no vacuum effect. They write that the grantons on Glestain knives are actually working. There really is a plane of complex shape, and not holes chosen by a simple circle of small radius. But that's what they charge money for.
Yes, it’s a pity that the bulge at the heel of the Santoki Centuri was cut so low. Apparently the programmers of CNC machines were too lazy. The RK has a curvature, and the grantons are located on a straight axis. We were lazy. 😞
After all, a knife with such notches actually becomes disposable - until the first sharpening. Because very often these recesses are located just a couple of mm from the RK.
Well, you're exaggerating this. Of course, if each sharpening is carried out on an electric sharpener with a P80 stone, then yes, the leads will fit onto the grantons through... right away. And if used correctly and periodically adjusted, the knife will last a long time. And here it is really close:
This is forgivable for inexpensive stainless steel knives that are used for cheese or boiled sausage.
But why these pockets are made on expensive knives made of good steel is unclear...
One answer suggests itself: to make them even more expensive. 😊
dobroxot 12/24/2012 - 10:47
Allegedly, so as not to stick - about the same thing, embarrassed and uncertain, the supermarket consultant tried to explain to me 😞
The cardinal method of non-stickiness
or like this
Regarding sharpening.
But many knives last 10-20 years, or even more, and during their service they wear down quite significantly in width. I don’t even think about cooks or butchers, where the knife burns out within a year. And such a design defect of a knife like these grantons seems like an ordinary scam for money.
alex9635 12/24/2012 - 11:33
dobroxotHow, in fact, can these pockets interfere with sharpening a knife? They do not go right through and the cutting edge can be formed directly on these pockets.
And such a design defect of a knife like these grantons seems like an ordinary scam for money.
http://blogs.yahoo.co.jp/kmasa...id=1641116&no=0
dobroxot
Supposedly so it doesn't stick
Why "supposedly"? They help. Somewhere more, somewhere less. And if you're concerned about food sticking, these air pockets are a good option.
dobroxot 12/24/2012 - 12:14
DIZOh gods! This infection has already spread to the Germans 😞
What are these conclusions from?
DIZ 24.12.2012 - 12:24
dobroxotAgain you are not entirely right. In almost all series, chefs and slicers have options with Hollow Edge. They are convenient to use. Products actually stick less.
Although if you take a closer look at the lineup of the same Henkels, you will see that there are only a couple of such edged knives among several dozen.
Whip 12/24/2012 - 12:28
Such nonsense finishing touches for the manufacturer bring a good profit at the end. 😊
Convexity, convexity, but convexity is another matter!
dm_roman 12/24/2012 - 22:19
these pockets, as well as the vertical stroke, as well as the transition of the edges from the side of the leading hand, so that there is less sticking and so that when shredding there is no fountain of already cut pieces above the knife.
it doesn't work for everyone
Tramontina Centuri Santoki works, this is what is in my photo, the second one in the post.
according to my modest statistics, from 50 to hundreds of such santas, no one was offended enough to bring this to me in the form of a complaint.
I began to ask, “is the fuli so low?”
In principle, if you turn your head into thinking mode and cut raw potatoes into thin slices, it will become completely clear.
The higher the pocket, the larger the area the piece will stick to the knife.
and upon reaching a certain size, this pocket will be of no use to him
Well, by the time you sharpen it to your pocket, it will take 10 years to edit/sharpen with musat
in a professional kitchen maybe five years, but in a year, I don’t believe it if my hands don’t grow from the anus
slicem 12/26/2012 - 08:05
dobroxotWhat about thinking? This could be, quite simply, the roughness of the surface, the coatings applied to it, or simply the geometry of the blade. I’m no expert here, but I wouldn’t be surprised if chem. The composition of the steel also affects, although I think very little.
But several questions arise here...
Why doesn't it stick with the Japanese, but only with these European guys?
Why does only the santoku stick, but the chef, with the same system, does not stick even without pockets?
Or has the santok already become, instead of a universal one, a highly specialized knife?
dobroxotI defend that 10-20 years is cool. And in the canteen it’s even cooler. In everyday life, 1mm of a blade should last for several years if the steel has an HRC of 50 or more and is sharpened so that it is sharp, and not re-cut every time.
Regarding sharpening.
For those who have knives, these are just toys that they use on Mondays - then, of course, the issue of grinding while sharpening is irrelevant.
I use the knives I have often, but rarely sharpen them, because the “cuts acceptable” parameter for me is more influenced by the geometry of the blade than by its sharpness. I consider it a waste of time to sharpen it every time it stops shaving. I’d rather lie on the sofa 😛.
apgspb 12/27/2012 - 13:53
In fact, some pocket knives can cause sharpening problems quite quickly.
http://zknives.com/knives/kitc...ensntkgrt.shtml
Or maybe this is for the better?
As far as I know, the first to patent air pockets was in Sheffield, the Granton company.
And they came up with them for long slicers.
Granton Knives still produces such knives. Their knives have pockets that extend onto the cutting edge (sort of)
They say that knives with this design cut better. And “non-sticking” of products is a free bonus
You will need to buy the original Granton and compare it with some simple slicer.
dobroxot 01/05/2013 - 17:33
Fellow knifephiles 😊
I have another question, this time not about the specific shape of the knife, santoke or chef, or the like. and not due to air pockets, but directly related to the stickiness of products.
Many manufacturers polish the blades of some knives completely, and some leave traces of machining.
I think this has something to do with the stickiness of the products and knives of certain categories. For example, meat knives are more often found with full polishing, but chefs' knives are rarely found.
For example, I will take Tramontina made of AISI 420 steel as it is more common:
- Universal and Tradicional series are almost all polished
- for the Ultracorte series, only small vegetable and steak ones are polished
- Polywood series mixed, but there are many more polished ones than Ultracorte
With Masters the situation is similar to Ultracorte, but the polishing on vegetable ones is less pronounced.
What does this actually involve?
DIZ 01/05/2013 - 18:16
dobroxotNot connected in any way. Polishing the blade increases the cost of the technical process, because... requires unnecessary operations. Often, “polishing” occurs naturally during the manufacturing process. For example, casting in a mold.
I think this has something to do with the stickiness of the products and knives of certain categories.
dobroxot 01/05/2013 - 18:32
DIZI call this and similar knife shapes a butcher knife
What do you call a butcher knife?
This and other meats among the Spaniards are somewhat similar to bowies. However, you can cut any meat 😊
It’s difficult to immediately determine the shape by the name, since Tramontina’s knives with the same shape can be called both Faca para carne so and Faca para cozinha.
But, in our understanding, chefs and fillets can still be included in the Tramontino category of meat knives, although in our country they would be called cutting or universal.
DIZ 01/05/2013 - 19:05
dobroxotThe blade of this knife is cut from tape, and then the slopes and the RK were formed. The tape was initially "polished". Pure manufacturing technology - rolling.
Although this is the cheapest series, it is clearly not cast, but stamped - but polished.
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provocative
knife myths
Hello, Friends! We continue our topic about knife myths. This article is a logical continuation of the article “”, so if anyone is not familiar yet, start with it. The topic is really quite broad, so it cannot be fit into one part.
By the way, I would like to take this opportunity to inform all my readers about an excellent store offering excellent handmade knives at reasonable prices and delivery throughout Russia (I want to buy such a knife). Well, now let's get back to our topic today.
So let's begin.
Myth No. 1.
A longitudinal notch on a knife blade is a “blood hole.”
This is a fundamentally wrong concept. According to (), clause 6, subclause 6.1.1.5.1, the term “krovostok” is an unacceptable synonym for the term “dol”. Dol- This is a longitudinal notch on the blade.
Fuller A clear example of reducing the weight of a knife due to the fuller 
Dol on a knife
And here there is no need to start ranting on the topic of what can be called one way or another, the main thing is that it is clear to everyone. And in general, that " bloodstream" is a common noun. Remember - the term " bloodstream" And " dol" are two different concepts and should not be linked.
The second myth is a continuation of the first.
Myth No. 2.
If a knife has a “bleed”, then such a knife is a bladed weapon.
Initially, there was an opinion that the presence of “ blood flow"on a knife increases bleeding if you leave the knife in the wound after a blow. But, apart from fiction and an attempt to pass off wishful thinking as reality, there is nothing more to this opinion.
Here is the real “Krovostok” and its leader “Shiloh”
Once again - this longitudinal notch - " dol", and it serves, first of all, to lighten the weight of the blade and balance it, as well as to strengthen the entire structure.
And, moreover, it is impossible to judge any transfer of a knife to the category of edged weapons, due to the presence of a fuller on the blade. There is, and this is the only thing that will give the product such a proud name. Therefore, this is not even a myth, but rather nonsense and ignorance of regulatory documents.
Myth No. 3.
A sure sign of a bladed weapon is an anatomical handle.
It is important to understand what an anatomical handle is. This can be either a regular handle, which has special finger grooves, or a custom-made handle based on a cast of the hand and exactly repeating its shape. Individually made handles are an extremely rare phenomenon and have nothing to do with the concept edged weapons.
Myth No. 4.
In the Russian Federation, knives with one-handed opening are prohibited.
Any adherent of this opinion will send you straight to, shouting - “Look, everything is written here - you can’t!”
You can refer to the article “Which knives are prohibited in Russia” for details, and in short, knives with automatic, inertial opening and “butterfly” type with a blade length are prohibited more than 90 mm.
Butterfly knife Automatic knife Folding knife
We are not talking about any other products. Thus, the vast majority of folding knives with flippers, hooks, pins, etc., have never been banned.
Myth No. 5.
If a knife has a lanyard, then you cannot carry such a knife with you.
No matter how crazy it may sound, such an opinion still exists. Of course, additional questions may arise from law enforcement officers, but in general, the presence of a lanyard does not in any way affect the involvement of the knife as a bladed weapon. To help you, the same article, which says nothing about it.
Leather lanyard Lanyards-keychains Lanyard on a knife
These are far from all the myths on knife topics, but that’s enough for today. Leave your controversial questions about knives in the comments, and I will try to answer them. That's all, like and subscribe to our news and updates.
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