Why don t those colors of the striped toothpaste mix together?

Why doesn't the color of color strip toothpaste be messy? No matter how much we squeeze the color striped toothpaste, it always "lies" on our toothbrush in a very neat way, how can this be explained?

When the color bar toothpaste leaves the factory, the paste of various colors has been arranged in a pre-designed position in the tube. When you squeeze the toothpaste, the paste of various colors will be arranged in their respective positions to form beautiful colored stripes.

In a discussion post on the DIY theme station of Guoke.com, netizens provided an anatomical diagram of the color bar toothpaste paste. As can be seen from the figure, the paste cross-section is divided into several sections of unequal area.

These different colored pastes are extruded through a small opening located in the center and naturally distributed in strips.

It turns out that when the color bar toothpaste is produced, the color of the paste has been fixed and the proportion is poured in, its cross-section is a circle, and when it is squeezed out in equal parts, the toothpaste mouth is in the middle, so the paste moves up together, is stretched at a very thin outlet, and several different colors of paste are twisted together.

Overall, the colors are chaotic, but if you only take a short screenshot, you can't see the confusion. You don't need a long toothpaste to brush your teeth, so the color bars look neat.

The key is that the various colors of the paste are mixed irregularly in the toothpaste, and the color harmony and interference between the monochrome does not occur, due to the bottleneck effect of the toothpaste mouth, and the length of the extrusion is not too long, so it can show regularity within a certain range, if the extrusion of a considerable length will inevitably occur a small deformation phenomenon.

This is due to the force, and the temporary regularity is related to the degree of mixing and blending of the clay that was put into the toothpaste shell, the color that is not easy to blend, and there is no other mechanism in the toothpaste.

Stretched at a very fine outlet, several pastes of different colors twisted together. Overall, the colors are chaotic.

That's because they weren't mixed together when they were designed, and that's how they were designed at the time.

Because it was decided at the time of design that it would not be mixed together.

Because that's how it was designed at the time.

If you mix them together, they can be mixed together.

It may be because there is a separator between the different colors.

Because the materials used are different, they do not mix.

That's because they weren't mixed together when they were designed.

Because these different colored materials don't mix together.

Reasons why colored toothpaste can stay colored in strips:When people squeeze the toothpaste skin hard, the white paste is normally cylindrical extruded, and the color paste is extruded from the fine groove on the mouth, just attached to the white paste, it becomes a beautiful color bar.

Benefits of colored toothpaste:Colorants are used in toothpastes to improve the sensory properties of the paste. In children's toothpaste, most of them use fruit flavors, which can be matched with corresponding pigments, such as pink for strawberry flavor and light yellow for citrus flavor; In Chinese herbal toothpaste, a small amount of pigment can be used to adjust the original color of the medicine to achieve a visually pleasant effect.

The color of general pigments comes from the selective absorption (or reflection) of light of a specific wavelength, while the brilliance of pearlescent pigments comes from the interference of light.

How is <> striped toothpaste designed? Why don't the colors mix? Why does toothpaste squeeze out colored streaks?

I used to have such a question, and then I bought a toothpaste, cut it with a knife and saw it, there is a partition inside, just say 2 colors of toothpaste, there is a partition inside, which is equivalent to 2 toothpaste, but there is no partition at the mouth of the toothpaste, so the squeeze out will be very good-looking, smooth toothpaste color, three colors are 3 partitions. Cut open a toothpaste and you'll understand. Inside the toothpaste are four small pouches, each containing a different color of toothpaste.

The pouches are all the same length, glued side by side, with the end fixed to the end of the toothpaste skin. The openings of the pouches are fastened together and glued to the openings of the toothpaste skin. Therefore, a color strip toothpaste is actually four small toothpastes of different colors.

Wrap the outside in a toothpaste skin.

Toothpaste is a Bingham fluid, a non-Newtonian fluid, usually a viscoplastic material, at low stress, it behaves as a rigid body, but at high stress, it flows like a viscous fluid, and its flow is linear. That is, toothpaste, a paste, can be fixed without force. The color bars of toothpaste are all pastes composed of macromolecules, and macromolecular pastes are incompatible.

In addition, toothpaste manufacturers often wrap the dye with polyethylene to make the coloring paste more stable.

For example, the red paste is an inlet, and the blue paste is inlet, so the toothpaste pipe is already colored. At the same time, because the toothpaste itself is a non-Newtonian fluid, there are thickeners and these colloids to trap solids and liquids, so the paste that is mixed with the pigment in advance will not penetrate into another evenly mixed paste so easily. Of course, if the toothpaste formula is not well blended, it is too soluble, or the thickener of this toothpaste is too weak, it will cause the two colors of paste to slowly penetrate each other.

So sometimes you will see that some color bars are squeezed out of the paste, and the boundary between the two colors is blurred.

In the process of designing, the color bar toothpaste uses a special instrument to squeeze the toothpaste color bar together and mix the color, so in the process of use, no matter how you rub it, it will not mix the color.

It is mainly designed through various color additives. The reason why it does not mix is because these additives do not undergo oxidation reactions.

Because colored toothpaste uses colorants and the toothpaste is Bingham fluid, it does not mix.

How is colored toothpaste designed? Why don't the colors mix?

Why is there a toothpaste with colored stripes that never mixes no matter how you squeeze it? Is there any black technology inside the toothpaste?

As early as the 60s of the last century, color stripe toothpaste has appeared. Originally, people would put all the white strips with high viscosity at the back of the tube, and the red strips with low viscosity near the outlet, and when we squeezed them out, the two toothpastes would mix together. At present, this mode of production has been eliminated.

Nowadays, the production of toothpaste has adopted the whole process of mechanized operation, the machine will put different colors of color strips into a tube with a partition, and then the perfusion machine will beat all the color strips into the toothpaste tube, cut the toothpaste, we will find that there is no partition in the tube, and the toothpaste is not mixed, thanks to the effect of the colorant.

In the production of toothpaste color strips, non-water-soluble, non-oil-containing colorants are added, and chemically stable polyethylene materials are used to wrap the pigments with anti-impermeable color. In addition, the characteristic of toothpaste is that it does not flow like a solid when it is not forced, and it can only start to flow when it is squeezed, so when the toothpaste is left unmoved, the color bar will remain stable. And when you squeeze the toothpaste, the paste flows like a liquid, and its flow conforms to a law of fluid mechanics --- the Reynolds number.

The greater the viscosity of a fluid, the smaller its Reynolds number, and conversely, the smaller the viscosity of the fluid, the greater the Reynolds number, and the level of this value determines how the liquid flows. If the Reynolds number is less than 2300, the liquid will flow in parallel and will not mix with each other, this flow is called laminar flow, if the Reynolds number is greater than 4000, the liquid will mix and flow, this flow is called turbulence.

The viscosity of toothpaste is very large, the Reynolds number is much lower than 2300, and its flow is that the laminar flow color bars and white bars will flow out in parallel together, and the extruded toothpaste is distinctly colored. In fact, in addition to squeezing toothpaste, laminar flow will also occur when running water. On December 15, 2018, a photographer in Italy was visiting the Alps when he noticed that the water in the faucet was as still as an icicle.

At this time, some people question, I feel that the water has no viscosity, the Reynolds number should be very high, why does there still appear laminar flow?

Let's take a look at the formula for calculating the Reynolds number, and we can see that in addition to the viscosity of the liquid, the Reynolds number is also related to the flow velocity. Laminar flow occurs when the average flow velocity of the fluid in the water pipe is equal to the ratio of the maximum flow velocity, and each water molecule moves exactly according to the trajectory of the previous water molecule. And according to the water viscosity and temperature comparison table, it will be found that when the water temperature is 20 degrees Celsius, its viscosity is a grain thin, and with the drop of temperature, the viscosity of water will continue to increase, so when the water temperature is relatively low, coupled with factors such as smooth inside the water pipe and small friction with water, the flowing water will show laminar flow phenomenon.

Nowadays a lot of toothpaste is colored colored toothpaste, at the time of making. Different pigments and elements are put into the toothpaste tube through a specific instrument, so they are not mixed.

The colored toothpaste should be colored first, and then spliced together, so it will not mix colors.

There will be a small bulkhead tube inside, and the colored part will be placed inside this small tube, and then it will appear together when you squeeze it.

The principle is that the toothpaste is disassembled from the back state, and then the back is sealed, and the production can be poured into different colors according to the proportion, because the approximate solid does not mix the color, and the extrusion is the suspicion of separating the color of the toothpaste

Three-color toothpaste is a non-Newtonian fluid, and three-color toothpaste is poured into it in different proportions during production. In addition, in order to prevent different colors from penetrating into each other, the manufacturer also added a polymer reagent to the toothpaste, and the polymer reagent has the characteristics of incompatibility, so when squeezing the three-color toothpaste, even if the order is disrupted, the extruded toothpaste is still striped. <

Three-color toothpaste is a non-Newtonian fluid, and three-color toothpaste is poured into it in different proportions during production. In addition, in order to prevent different colors from penetrating into each other, the manufacturer also added a polymer reagent to the toothpaste, and the polymer reagent has the characteristics of incompatibility, so when squeezing the three-color toothpaste, even if the order is disrupted, the extruded toothpaste is still striped.

The principle is that the toothpaste is loaded from the back, and then the back is sealed, and the production can be poured into different colors according to the proportion, because the approximate solid does not mix the color, and the extrusion is the color toothpaste with separate colors

The principle is that the toothpaste is loaded from the back, and then the back is sealed, and the production can be poured into different colors according to the proportion, because the approximate solid does not mix the color, and the extrusion is the color toothpaste with separate colors

Mainly in the upper part of the mouth, that is, the hard point, that section has a small groove in the inner circle, and the colored part is inside, and it is brought out together when squeezed.

The clever mechanism is in the mouth, the colored one is in a circle in the mouth, the middle and the back are white, and the pressure is forward together when squeezing, and the green and white are squeezed out together to form a color bar, and you can look at it when you are finished.

In any case, as long as the toothpaste tastes right, you are happy to brush yourself, and the teeth are clean, is it a good toothpaste. Other issues. o( o Oh, it's nothing?。。

Because the color strip toothpaste is poured into the business according to the ratio during the production, the cross-section is a circle, and the toothpaste body moves upwards when it is squeezed out, and the toothpaste mouth is in the middle, and several different colors are slowly squeezed out, showing the color stripe. During daily use, normal squeezing will not destroy the shape of the color bar. <

Because the color strip toothpaste is poured into the business according to the ratio during the production, the cross-section is a circle, and the toothpaste body moves upwards when it is squeezed out, and the toothpaste mouth is in the middle, and several different colors are slowly squeezed out, showing the color stripe. During daily use, normal squeezing will not destroy the shape of the color bar.