KR102504599B1 - Dewatering apparatus of polymer latex - Google Patents

Abstract

The present invention relates to a dewatering device for polymer latex, and more particularly, to a device comprising: i) a hollow barrel having a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports, wherein the barrel includes a plurality of baffles asymmetrically disposed on an inner surface of the polymer latex dewatering device.
According to the present invention, the drying efficiency is further improved by repetition of pressing and mixing, thereby greatly reducing the moisture content of the polymer powder, having a sufficient dehydration effect without performing a subsequent drying process, and also increasing productivity while reducing energy requirements. It has the effect of providing a dehydration device for polymer latex.

Description

Dewatering device of polymer latex {DEWATERING APPARATUS OF POLYMER LATEX}

The present invention relates to a dehydration device for polymer latex, and more particularly, by repeating compression and mixing, the drying efficiency is further improved to greatly reduce the moisture content of polymer powder, and a sufficient dehydration effect is obtained without performing a subsequent drying process, It also relates to a polymer latex dehydration device capable of reducing energy consumption while increasing productivity.

In general, polymer latex obtained by emulsion polymerization is processed into polymer powder through a coagulation process, a dehydration process, and a drying process.

The dehydration process and the drying process can be roughly divided into two types: a fluidized bed drying method and a dehydration extrusion method. The fluidized bed drying method consists of removing water primarily in a centrifugal dehydrator and supplying hot air to the powder containing moisture in the fluidized bed dryer to remove water while moving the powder. After dehydration to have a lower water content by physically compressing the powder in a dehydration extruder, the remaining moisture is removed in a dryer.

However, the fluidized bed dryer has a disadvantage in that it is difficult to remove moisture in the fluidized bed dryer when the powder size or moisture content is high because there are restrictions on the conditions for forming a fluidized bed, that is, the size and moisture content of the powder to be injected. Due to this problem, after dehydration using a dehydration extrusion method that is less sensitive to conditions such as powder size or water content, additional drying is performed using a dryer.

1 below schematically shows the configuration of a conventional dehydration device.

As shown in FIG. 1, the conventional dehydration device 1 includes an input unit 11 and an input screw 12 for supplying polymer powder to be dehydrated supplied through the input unit 11 into the dehydration unit 14. ), a dehydration unit 14 for dewatering by mechanically compressing the polymer powder from the input screw 12, and an outlet unit 15 for discharging the polymer powder from the dehydration unit 14. The input screw 12 is driven by a motor 13 and the screw in the dewatering unit 14 is driven by a motor 16 to transport or compress the polymer powder. The dewatering part 14 includes a cylindrical barrel and a spiral screw for mechanically compressing the polymer powder while rotating in the barrel, and the outlet part 15 includes a die plate having at least one discharge port formed therein. plate) is fixed, and the compressed polymer powder is pushed out through this outlet. In addition, at least one drain hole for discharging moisture to the outside is formed in the barrel. Therefore, since the polymer powder flows out through the discharge hole having a narrow cross-sectional area formed in the die plate fixed to the outlet part 15, a physically high pressure is applied to the polymer powder in the barrel, and thus moisture flows through the drain hole. It may be discharged through, or it may be vaporized and discharged due to the pressure difference between the inside and outside of the barrel of the dewatering unit 14. However, in the case of the conventional dehydration device 1 having the configuration as described above, it is difficult to lower the water content of the polymer powder to a certain level or less, and accordingly, an additional drying process through a dryer is required.

Korean Patent Publication No. 2004-0064252

In order to solve the problems of the prior art as described above, the present invention further improves the drying efficiency by repeating compression and mixing to greatly reduce the moisture content of the polymer powder, has a sufficient dehydration effect without performing a subsequent drying process, and also increases productivity It is an object of the present invention to provide a dehydration device for polymer latex that can reduce energy consumption while increasing.

The above and other objects of the present invention can all be achieved by the present invention described below.

In order to achieve the above object, the present invention is i) a hollow barrel having a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports, wherein the barrel includes a plurality of baffles asymmetrically disposed on an inner surface of the barrel.

In addition, the present invention includes i) a hollow barrel having a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports, wherein the barrel includes a plurality of baffles asymmetrically disposed on an inner surface of the barrel, and the cross-sectional area of the internal space of the barrel is It provides a polymer latex dehydrator in which the length of the heating section (ℓt) formed by the screw having a cross-sectional area within the range of 70 to 95% is within the range of 30 to 45% of the length of the barrel.

According to the present invention, the drying efficiency is further improved by repetition of pressing and mixing, thereby greatly reducing the moisture content of the polymer powder, having a sufficient dehydration effect without performing a subsequent drying process, and also increasing productivity while reducing energy requirements. It has the effect of providing a dehydration device for polymer latex.

1 is a configuration diagram schematically showing the configuration of a conventional dehydration device for dehydration of polymer latex.
Figure 2 is a configuration diagram schematically showing the configuration of the dehydration unit of the dehydration device for dehydration of polymer latex according to the present invention.
FIG. 3 is a configuration diagram schematically showing the front of the outlet side of the dewatering unit of FIG. 2 .
4 is a configuration diagram schematically comparing an example of an asymmetrical baffle (above) and an example of a non-symmetrical baffle (below) according to the present invention.
5 is a schematic configuration diagram of a zigzag asymmetrical baffle according to the present invention.
Figure 6 is a graph showing the change in moisture content with respect to the internal temperature in Example 1 according to the present invention and Comparative Example 1 in contrast thereto.
Figure 7 is a graph showing the change in moisture content with respect to the internal temperature in Example 2 according to the present invention and Comparative Example 2 in contrast thereto.

Hereinafter, the polymer latex dehydration device of the present description will be described in detail.

The present inventors confirmed that when a barrel having an asymmetrical baffle group formed on the inner surface is applied to a polymer latex dehydration device, the drying efficiency is further improved by repeated compression and mixing of the dehydration target, and the water content of the polymer powder discharged is greatly reduced. And based on this, further research was devoted to completion of the present invention.

The polymer latex dewatering device of the present invention includes: i) a hollow barrel having a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports formed therein, wherein the barrel includes a plurality of baffles asymmetrically disposed on an inner surface thereof. In this case, the drying efficiency is further improved by repetition of compression and mixing, so that the moisture content of the polymer powder is greatly reduced, a sufficient dehydration effect is obtained without performing a subsequent drying process, and the effect of reducing energy consumption while increasing productivity is obtained. there is.

For example, the baffle may be positioned between adjacent blades of the screw based on a cross section cut in the longitudinal direction of the barrel, and in this case, mixing efficiency is excellent.

The plurality of baffles may be arranged in a row or zigzag in the longitudinal direction of the barrel, for example, and in this case, the drying efficiency is further improved by repetition of compression and mixing, thereby significantly reducing the moisture content of the polymer powder. there is.

The plurality of baffles may be, for example, a total of 2 or more or 5 or more, preferably 6 or more, or 7 or more, and in another example, 2 to 50 or 5 to 30, preferably 6 to 50 baffles. It may be 25, or 7 to 20, and within this range, the drying efficiency is further improved by repetition of compression and mixing, thereby significantly reducing the moisture content of the polymer powder.

For example, the length of the warming section (ℓt) formed by the screw having a cross-sectional area within the range of 70 to 95% of the cross-sectional area of the inner space of the barrel in the barrel is 10 to 50% of the length of the barrel or within the range of 20 to 45%, preferably within the range of 30 to 45%, more preferably within the range of 35 to 40%, and within this range, the drying efficiency is improved to increase the moisture content of the polymer powder. There is an effect of reducing energy consumption while increasing productivity and having a sufficient dehydration effect even without performing a subsequent drying process.

The total cross-sectional area of the discharge port may be, for example, within the range of 5 to 20% or within the range of 5 to 15%, preferably within the range of 10 to 15% of the cross-sectional area of the barrel, within this range, the drying efficiency It has the effect of reducing the water content of the polymer powder by improving the moisture content of the polymer powder, having a sufficient dehydration effect without performing a subsequent drying process, and reducing energy consumption while increasing productivity.

For example, the plurality of baffles may be formed in the warming section, and in this case, productivity may be increased, while the internal temperature may be lowered and the moisture content may be lowered due to the asymmetric shape, thereby reducing required energy.

For example, a primary dehydrator for mechanically dewatering the polymer slurry flowing into the barrel may be further connected to the other end of the barrel, in which case the drying efficiency is improved to lower the moisture content of the polymer powder and perform a subsequent drying process It has a sufficient dehydration effect even without it, and also has the effect of reducing energy consumption while increasing productivity.

The primary dehydrator may be, for example, a centrifugal dehydrator, and in this case, there is an effect of reducing energy consumption while increasing productivity.

The polymer latex dehydration device of the present invention may further include, for example, a polymer latex input unit 11, an input motor 13, an input screw 12, and a mixing motor 16, all of which are in this technical field. It is not particularly limited within the range commonly applied in

As another example, the polymer latex dehydrator of the present invention includes: i) a hollow barrel having a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports, wherein the barrel includes a plurality of baffles asymmetrically disposed on an inner surface of the barrel, and the cross-sectional area of the internal space of the barrel is It is characterized in that the length of the warming section (ℓt) formed by the screw having a cross-sectional area within the range of 70 to 95% is within the range of 30 to 45% of the length of the barrel. In this case, the drying efficiency is further improved by repetition of compression and mixing, so that the moisture content of the polymer powder is greatly reduced, a sufficient dehydration effect is obtained without performing a subsequent drying process, and the effect of reducing energy consumption while increasing productivity is obtained. there is.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 2, the polymer latex dehydration device according to the present invention includes a hollow barrel 21 having a drainage hole formed with an asymmetrical baffle group 21a, and rotatably fixed in the barrel 21. A screw 22, and a die plate fixed to one end of the barrel 21 and having one or more discharge ports 23 formed therein, wherein the cross-sectional area of the inner space of the barrel 21 within the barrel 21 Characterized in that the length of the warming section (ℓ _t ) formed by the screw 22 having a cross-sectional area within the range of 70 to 95% of the range of 10 to 50% of the length of the barrel 21.

The asymmetrical baffle group 21a is preferably formed spaced apart in a row along one side of the inner surface of the barrel along the longitudinal direction. At this time, referring to FIG. 2, each baffle is positioned between wings based on a cross section obtained by cutting the barrel 21 and the screw 22 in the longitudinal direction.

The cross-sectional area of the screw 22 in the heating section (ℓ _t ) is constant, but may be formed by roughening the surface of the screw 22 so that a plurality of protrusions are formed, and these protrusions reduce friction against the slurry. and increase the temperature of the slurry due to the increase in the generation of frictional heat due to the increase in friction, and with this effect, water is evaporated to perform dehydration. The shape, size, number and forming method of the protrusions are not limited, and it can be understood that the heating section is formed by any shape, size, number and forming method for increasing friction, of the present invention It should be understood as belonging to the category.

The protrusions may be formed on a surface of a rotating shaft constituting the screw 22 and/or a surface of a rotating blade. That is, the present invention is proposed to solve the conventional problems as described above, and is characterized in that it provides an extruder-type dehydration device having a configuration capable of further lowering the water content of the polymer latex to be dehydrated. .

The polymer latex dehydration device according to the present invention has a continuous extruder type, and due to the increased dehydration efficiency, it is possible to improve productivity by solving bottlenecks that may be caused in the conventional drying process, and furthermore, extruder-type dehydration without a drying process. This made it possible to produce polymer powder with a sufficiently low water content using only the device.

As shown in FIG. 2, the dehydration apparatus according to the present invention is configured to include a warming section (ℓ _t ) in the barrel 21 constituting the dehydration unit, and the length of the warming section (ℓ _t ) is the barrel ( 21) within the range of 10 to 50% of the length, where the warming section (ℓ _t ) is such that the cross-sectional area of the screw 22 is 70 to 95% of the cross-sectional area of the inner space of the barrel 21 It is formed by having a cross-sectional area within the range. The cross-sectional area of the screw 22 refers to a cross-sectional area based on the diameter (d _s ) of the screw 22, and the cross-sectional area of the barrel 21 is based on the inner diameter (d _b ) of the hollow barrel means the cross-sectional area of

In the heating section, the temperature is increased due to the frictional force between the powder and the screw, between the powder and the powder, and between the powder and the baffle.

In the heating section, moisture in the polymer latex is evaporated by the temperature raised due to the generation of heat by frictional force as described above, and thus, a dehydration and / or drying effect similar to that of a dryer can be exhibited, thereby obtaining a polymer powder can have a low moisture content. In order to maximize the dehydration effect by increasing the evaporation effect of moisture due to the generation of frictional heat, in order to increase the dehydration and / or drying effect by evaporation of moisture as described above, the heating section (ℓ _t ) in the barrel 21 It may be advantageous to increase the length, and preferably, the length of the warming section (ℓ _t ) is preferably within the range of 10 to 50% of the length of the barrel 21, in particular, according to the present invention, the screw ( 22) is formed by having a cross-sectional area within the range of 70 to 95%, preferably 80 to 90%, and more preferably 85 to 90% of the cross-sectional area of the inner space of the barrel (21). It is preferable that the length of the warming section (ℓt) be within the range of 10 to 50%, preferably 35 to 50%, more preferably 35 to 45% of the length of the barrel 21, within this range It is possible to perform dehydration and extrusion at a rate that allows continuous dehydration while maximizing the dehydration and/or drying effect, and the cross-sectional area of the screw 22 in the warming section is the inner space of the barrel 21 If it exceeds the range of 70 to 95% of the cross-sectional area, there may be a problem in that productivity is lowered because sufficient dehydration and/or drying cannot be achieved or the treatment speed is too slow.

In the screw 22, the portion of the screw 22 other than the warming section (ℓ _t ) functions as a compression section (ℓ _p ).

The compression section (ℓ _p ) is compressed while the polymer latex is pushed toward the discharge port having a narrow diameter due to the rotation of the screw 22, thereby reducing the space between the polymer latex and forcibly pushing out moisture to form the polymer latex. function to dehydrate. This dehydration function reduces the volume inside the barrel while increasing the cross-sectional area of the screw in the compression section (ℓ _p ), and shows the effect of eliminating empty spaces between the slurries, which is accompanied by dehydration.

That is, the compression section is a section in which the volume of the polymer latex to be dehydrated is changed, that is, reduced, and is compressed by the barrel 21 and the screw 22 rotatably fixed in the barrel 21. It can be. This is the same or similar principle as in a conventional extruder, and can be easily implemented by those skilled in the art.

The polymer latex dehydration device according to the present invention having the above structural characteristics may further include a heating means, and the heating means may preferably be included in or adjacent to the heating section, and more preferably Preferably, it may be located above or below the discharge port.

The heating means may be, for example, a means capable of heating up to 150 °C.

In addition, the polymer latex dehydration device according to the present invention is characterized in that, as shown in FIG. 3 below, the total cross-sectional area of the discharge port 23 is formed within the range of 5 to 20% of the cross-sectional area of the barrel 21. to be Here, the cross-sectional area of the barrel means a cross-sectional area based on the inner diameter (d _b ) of the hollow barrel. As described above, it is preferable to make the total cross-sectional area of the discharge port 23 within the range of 5 to 15%, preferably 8 to 15%, more preferably 8 to 12% of the cross-sectional area of the barrel 21. It is preferable to obtain a high dehydration effect and/or drying effect while maintaining a dehydration rate that does not cause a decrease in productivity.

The discharge port 23 may be formed by dividing into at least one or a plurality of the die plate fixed to the end of the dewatering unit of the extruder, and the powder is produced in a certain shape according to the shape of the discharge port 23 formed on the die plate. make it possible to do The die plate causes the pressure inside the barrel 21 to increase, and the pressure inside the barrel 21 can be increased or decreased by adjusting the area of the discharge port 23 . In the present invention, the total cross-sectional area of the discharge port 23 is within the range of 5 to 20% of the cross-sectional area of the barrel so that a high pressure is maintained in the barrel 21. The heating section formed in the barrel 21 By enabling to increase the generation of frictional heat in the barrel, it is possible to sufficiently evaporate and remove moisture in the polymer slurry by increasing the temperature due to the pressure difference between the inside and outside of the barrel and the frictional heat.

In addition, a primary dehydrator for mechanically dewatering the polymer slurry flowing into the barrel 21 may be further connected to the other end of the barrel 21, and by employing the primary dehydrator, the dewatering device according to the present invention After first removing moisture from the introduced polymer slurry, it can be advantageous to control the moisture content of the polymer powder to be particularly low by allowing it to be introduced into the dewatering device according to the present invention. The dehydration according to the present invention is adjusted so that the water content of the polymer slurry from which water is first removed by the primary dehydrator is within the range of 10% or more, preferably 10 to 35%, more preferably 20 to 30% It is preferable to obtain a polymer powder having a low moisture content while maintaining a sufficiently high dehydration rate by the device.

The primary dehydrator may be a centrifugal dehydrator. Such a centrifugal dehydrator puts polymer slurry into a rotatable cylinder in which a plurality of water passages are formed, and rotates the cylinder to apply centrifugal force to the polymer slurry so that only water is passed through the water passage in a state in which solids are caught in the water passage and cannot escape. It can be understood that it has a configuration to perform dehydration by letting it escape through, and it can be understood that it is known enough to obtain and use commercially available products from leading domestic and foreign manufacturers, and is widely used for household and / or industrial washing machines. It can be understood as the same as or similar to the principle of.

In the present description, the polymer latex includes all forms of polymers produced after polymerization and before becoming powder, and may include, for example, a polymer slurry in which a part of the polymer latex is solidified.

4 shows an example of an asymmetrical baffle (top) and an example of a non-symmetrical baffle (bottom) according to the present invention. Here, the symmetric baffle means that baffles facing each other are included based on the cross section formed when the barrel is cut in the longitudinal direction, and in this case, two or more baffles are arranged in the same row, that is, on the same longitudinal axis will be located The asymmetrical baffle according to the present invention means that it is not the same as the symmetrical baffle, that is, there is no opposing baffle, and preferably the one-sided asymmetrical baffle shown in the upper part of FIG. 4 or the zigzag shown in FIG. 5 below ( zig-zag) may be an asymmetrical baffle. The one-sided asymmetrical baffle means that baffles are formed on only one side when the barrel is divided into upper and lower sides, and the zigzag asymmetrical baffle means that the upper and lower sides are alternately formed along the longitudinal direction without baffles opposing each other. Here, all baffles are spaced apart from each other with adjacent blades of the screw.

The polymer latex dehydrated by the polymer latex dehydration device according to the present invention may preferably be an ABS-based graft copolymer.

For example, the ABS-based graft copolymer may be obtained by graft emulsion polymerization of a mixture of an aromatic vinyl monomer and a vinyl cyan monomer to rubber latex.

The rubber latex is, for example, butadiene rubber (BR), ethylene-propylene-diene monomer rubber (EPDM), ethylene propylene rubber (EPR), halobutyl rubber, butyl rubber, styrene-isoprene-styrene rubber (SIS), styrene- It may be selected from the group consisting of butadiene rubber (SBR) and a mixture of two or more of them.

For example, the aromatic vinyl monomer may be selected from the group consisting of styrene, alphamethylstyrene, alphaethylstyrene, paramethylstyrene, vinyltoluene, derivatives thereof, and mixtures of two or more thereof.

For example, the vinyl cyan monomer may be selected from the group consisting of acrylonitrile, methacrylonitrile, ethacrylonitrile, derivatives thereof, and mixtures of two or more thereof.

The ABS-based graft copolymer may be, for example, an acrylonitrile-butadiene-styrene copolymer.

The acrylonitrile-butadiene-styrene copolymer may include, for example, 40 to 70 parts by weight of butadiene, 5 to 20 parts by weight of acrylonitrile, and 10 to 40 parts by weight of styrene.

Hereinafter, preferred embodiments are presented to aid understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It goes without saying that changes and modifications fall within the scope of the appended claims.

[Example]

Comparative Example 1

It includes symmetrical baffles (a total of 14 upper and lower symmetrical baffles) as shown in the lower figure of FIG. 4, the diameter of the screw is 87.3% of the inner diameter of the barrel, and the length of the warming section (ℓt) is 16 %, and the total cross-sectional area of the discharge port was 10.5% of the internal cross-sectional area of the barrel, and a polymer latex dehydration device was prepared. Nitrile-butadiene-styrene copolymer (a polymer slurry with a composition ratio of acrylonitrile: butadiene: styrene = 11: 60: 29 was used,

The polymer slurry was introduced into the dewatering device at a flow rate of 580 g/min, and dehydration was repeated 10 times under conditions of a retention time of 1.5 minutes and a screw rotation speed of 110 rpm. The temperature inside was measured at the rear end of the heating section right in front of the discharge port, and the water content (% by weight) of the polymer powder discharged through the discharge port was measured, and the average results are shown in Table 1 and FIG. 6 below.

The moisture content was measured using a moisture analyzer from Mettler Toledo, Switzerland.

Example 1

It was carried out in the same manner as in Comparative Example 1, except that a polymer latex dehydration device including a single-sided asymmetric baffle (a total of 7 single-sided baffles) as shown in the upper figure of FIG. 2 or FIG. 4 was used, and The results are shown in Table 1 and FIG. 6 below.

Comparative Example 2

The same procedure as in Comparative Example 1 was performed except that the length of the warming section (ℓt) was 37% of the length of the barrel, and the results are shown in Table 1 and FIG. 7 below.

Example 2

The same procedure as in Example 1 was performed except that the length of the warming section (ℓt) was 37% of the length of the barrel, and the results are shown in Table 1 and FIG. 7 below.

division Heated section (%) Discharge port area (%) baffle type Average temperature (℃) Average pressure (kg/cm2) Average moisture content (% by weight) Comparative Example 1 16 10.5 Symmetry 99 1.2 5.98 Example 1 16 10.5 Asymmetric (one side) 105 0.9 2.15 Comparative Example 2 37 10.5 Symmetry 104 1.7 2.12 Example 2 37 10.5 Asymmetric (one side) 107 1.5 1.06

As shown in Table 1, FIGS. 6 and 7, it was confirmed that the polymer powder having a low moisture content to be obtained can be obtained by using the polymer latex dehydration device including an asymmetric baffle according to the present invention. .

That is, when comparing Example 1 and Comparative Example 1 with reference to Table 1 and FIG. 6, as the symmetrical baffle (Comparative Example 1) was changed to the asymmetrical baffle (Example 1), the moisture content (average value of 10 times) increased. It was confirmed that the effect decreased from 5.98% to 3.83%. This proves that the internal pressure is lowered and the internal temperature is increased due to repetition of compression and mixing by the asymmetric baffle, thereby lowering the outlet moisture content.

In addition, when comparing Example 2 and Comparative Example 2 with reference to Table 1 and FIG. 7, as the symmetric baffle (Comparative Example 1) was changed to the asymmetric baffle (Example 1), the moisture content (average value of 10 times) increased. It was confirmed that the effect decreased from 2.12% to 1.06%. This also proves that the internal pressure is lowered and the internal temperature is increased due to repetition of compression and mixing by the asymmetric baffle, thereby lowering the outlet moisture content. This is particularly meaningful in that it achieved an effect that is difficult to predict and achieve in the prior art of less than 2% moisture content.

Therefore, the polymer latex dehydration device according to the present invention provides a device capable of improving the dehydration efficiency of the polymer latex in a continuous extruder type device, thereby reducing the moisture content of the polymer powder compared to the conventional dehydration process and drying in the subsequent drying process. By reducing the time, it can help improve the productivity of the polymer powder as a whole, and also has the effect of using less energy compared to the dryer, thereby increasing the energy use efficiency. Furthermore, there is an effect of enabling the production of polymer powder having a sufficiently low water content even if the subsequent drying step is omitted by adjusting the operation method.

1: dehydrator 11: inlet
12: input screw 13: input motor
14: dewatering unit 16: mixing motor
15: outlet 21: barrel
21a: baffle 22: screw
23: discharge port

Claims (9)

i) a hollow barrel with a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports formed thereon,
The barrel includes a plurality of baffles asymmetrically disposed on an inner surface,
The length of the warming section (ℓt) formed by the screw having a cross-sectional area within the range of 70 to 95% of the cross-sectional area of the internal space of the barrel in the barrel is within the range of 10 to 50% of the length of the barrel characterized
Dewatering device for polymer latex. According to claim 1,
The baffle is characterized in that located between the adjacent wing and wing of the screw based on the cross section cut in the longitudinal direction of the barrel
Dewatering device for polymer latex. According to claim 1,
Characterized in that the plurality of baffles are arranged in a row or zig-zag in the longitudinal direction of the barrel
Dewatering device for polymer latex. According to claim 1,
The plurality of baffles are characterized in that a total of two or more
Dewatering device for polymer latex. delete According to claim 1,
Characterized in that the total cross-sectional area of the discharge port is within the range of 5 to 20% of the cross-sectional area of the barrel
Dewatering device for polymer latex. According to claim 1,
Characterized in that a primary dehydrator for mechanically dewatering the polymer slurry flowing into the barrel is further connected to the other end of the barrel
Dewatering device for polymer latex. According to claim 7,
Characterized in that the primary dehydrator is a centrifugal dehydrator
Dewatering device for polymer latex. i) a hollow barrel with a drain; ii) a screw rotatably fixed in the barrel; and iii) a die plate fixed to one end of the barrel and having one or more discharge ports formed thereon,
The barrel includes a plurality of baffles asymmetrically disposed on an inner surface,
The length of the warming section (ℓt) formed by the screw having a cross-sectional area within the range of 70 to 95% of the cross-sectional area of the internal space of the barrel in the barrel is within the range of 30 to 45% of the length of the barrel characterized
Dewatering device for polymer latex.

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