JP2009256820A - Apparatus and method for pressure steam treatment for yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and method for pressure steam treatment for a yarn which have excellent reduction effect on the amount of pressure steam leaked from the inside of the apparatus, suppress occurrence of fluff and end breakages , and provide a high-quality yarn. <P>SOLUTION: In the apparatus that has a pressure steam treatment part for treating a yarn Z traveling in a fixed direction by pressure steam and two labyrinth seal parts 20 extended from the front and the rear of the pressure steam treatment part 10 in which the labyrinth seal parts 20 have a plurality of labyrinth nozzles 24 composed of plate pieces extended perpendicularly from inner wall surfaces 22 to the yarn Z, the yarn pressure steam treatment apparatus 1 has a ratio (L/P) of an extension length L from the inner wall surfaces 22 of the labyrinth nozzles 24 to a pitch P between the adjacent labyrinth nozzles 24 of less than 0.3 and the thickness of the plate pieces of not more than 3 mm. Further, the method uses the pressure steam treatment apparatus 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pressurized steam treatment apparatus and a pressurized steam treatment method for a yarn.

  In the production of carbon fiber and the like, a yarn made of a polyacrylonitrile-based polymer or the like is used as a raw yarn, and this yarn is required to have excellent strength and degree of orientation. For example, such a yarn is obtained by spinning a spinning stock solution containing a polyacrylonitrile-based polymer into a coagulated yarn, drawing the coagulated yarn in a bath and drying to obtain a yarn that is densified, It can be obtained by subjecting the yarn to a secondary stretching treatment in a pressurized steam atmosphere.

  For processing the yarn in a pressurized steam atmosphere, a processing device is used in which the yarn travels inside the device and pressure steam is supplied to the yarn. In such a processing apparatus, if a large amount of pressurized steam supplied to the inside of the apparatus leaks out of the apparatus from the yarn inlet and outlet, the pressure, temperature, humidity, etc. inside the apparatus become unstable, and Fluff and thread breakage may occur. Moreover, in order to suppress the influence of leakage of pressurized steam to the outside of the apparatus, a large amount of pressurized steam is required, and the energy cost has been increased.

  A processing apparatus for suppressing leakage of pressurized steam from the inside of the apparatus includes a pressurized steam processing unit that processes the yarn traveling in a certain direction with the pressurized steam, and two labyrinths that extend from the front and rear of the pressurized steam processing unit. There is known a pressurized steam processing apparatus including a seal portion. The labyrinth seal portion is provided with a plurality of labyrinth nozzles made of plate pieces extending perpendicularly from the inner wall surface toward the yarn, and energy is passed when passing through each space (expansion chamber) between the labyrinth nozzles. As a result, the amount of pressurized steam leaked is reduced.

Specifically, Patent Document 1 includes a pressurized steam processing section and two labyrinth seal sections extending from the front and rear of the pressurized steam processing section, and each labyrinth seal section has an 80-120 stage labyrinth nozzle. A pressurized steam processing apparatus that is provided and has a ratio (L / P) of an extension length L from the inner wall surface of the labyrinth nozzle to a pitch P between adjacent labyrinth nozzles of 0.3 to 1.2 It is shown.
JP 2001-140161 A

  The pressurized steam treatment apparatus of Patent Literature 1 can reduce the amount of pressurized steam leaking from the inside of the apparatus. However, even in this pressure steam treatment apparatus, fluff or yarn breakage may occur in the obtained yarn. Therefore, it is desired to further improve the effect of reducing the amount of pressurized steam leaking from the inside of the apparatus.

  Therefore, in the present invention, the pressurized steam processing apparatus and the pressurized steam processing are excellent in the effect of reducing the leakage amount of the pressurized steam from the inside of the apparatus, and can obtain a high-quality yarn with suppressed generation of fuzz and yarn breakage. Intended method.

  The pressure steam processing apparatus for a yarn according to the present invention includes a pressure steam processing unit that processes the yarn traveling in a certain direction with the pressure steam, and two labyrinth seal portions that extend from the front and rear of the pressure steam processing unit. The labyrinth seal part has a plurality of labyrinth nozzles made of plate pieces extending perpendicularly from the inner wall surface of the labyrinth seal part toward the yarn, and from the inner wall surface of the labyrinth nozzle The ratio (L / P) of the extending length L of the labyrinth nozzles to the pitch P between adjacent labyrinth nozzles is less than 0.3, and the thickness of the plate piece is 3 mm or less. .

Moreover, it is preferable that the said pitch P is 16-29 mm in the pressurization steam processing apparatus of the thread | yarn of this invention.
The length L is preferably 3 mm or more.

Moreover, the pressure steam processing method of the yarn of the present invention uses the pressure steam processing apparatus to perform the pressure steam processing on the yarn with a filling rate F represented by the following formula being 0.5 to 10%. Is the method.
F = [K / (ρ × 10 ⁵ )] / A
However, in the formula, K is the yarn fineness (tex), ρ is the yarn density (g / cm ³ ), and A is the opening area of the opening formed by the labyrinth nozzle in the labyrinth seal portion ( cm ² ).

The pressurized steam treatment apparatus for yarn of the present invention is excellent in the effect of reducing the amount of pressurized steam leaking from the inside of the apparatus, and can obtain a high-quality yarn.
Further, according to the pressure steam treatment method for yarns of the present invention, it is possible to suppress the occurrence of fuzz and yarn breakage and to obtain high quality yarns.

[Pressure steam processing equipment]
FIG. 1 is a cross-sectional view showing an example of an embodiment of a pressurized steam treatment apparatus for yarn.
The pressurized steam processing apparatus 1 (hereinafter referred to as the processing apparatus 1) of the present embodiment includes a pressurized steam processing unit 10 that processes the yarn Z traveling in a certain direction with the pressurized steam, and the pressurized steam processing unit 10. And two labyrinth seal portions 20 extending from the front and rear of each.

  In the pressurized steam processing unit 10, steam inlets 12 for supplying steam are formed up and down, and two pressurized chambers 16 are formed in the inside by a wall portion 14 composed of two perforated plates. A yarn traveling path 18 on which the yarn Z travels is formed between the wall 14 and the wall portion 14.

  The material of the pressurized steam processing unit 10 may be a material having sufficient mechanical strength to perform a sealing process for preventing steam leakage. For example, the material of the portion that may come into contact with the yarn Z inside the pressure steam processing unit 10 has corrosion resistance and can reduce the impact on the yarn Z when it comes into contact. The material which gave the hard chrome plating process to the steel material is mentioned.

The labyrinth seal portion 20 has a plurality of labyrinth nozzles 24 made of plate pieces extending perpendicularly from the inner wall surface 22 toward the yarn Z, and the labyrinth nozzles 24 are connected to the yarn running path inside the labyrinth seal portion 20. An opening 26 is formed, and an expansion chamber 28 is formed between adjacent labyrinth nozzles 24. In addition, the primary side labyrinth seal portion 20 of the pressurized steam processing unit 10 is formed with a yarn inlet 30 for introducing the yarn Z, and the secondary side labyrinth seal portion 20 of the pressurized steam processing unit 10 is connected to the secondary side labyrinth seal portion 20. A yarn outlet 32 is formed through which the yarn Z is led out.
The material of the labyrinth seal portion 20 may be a material having sufficient mechanical strength for performing a sealing process for preventing leakage of steam, like the pressurized steam processing portion 10.

By forming the expansion chamber 28 in the labyrinth seal portion 20 by the labyrinth nozzle 24, vortex flow is generated in the flow of the pressurized steam in the expansion chamber 28 and energy is consumed, whereby the pressure is lowered and the pressurized steam is reduced. The amount of leakage is reduced.

The labyrinth nozzle 24 is formed of a plate piece and is formed to extend vertically from the inner wall surface 22 toward the yarn Z that travels inside the labyrinth seal portion 20.
The material of the plate piece is not particularly limited, but from the point that it has corrosion resistance and can reduce the impact on the yarn when it comes into contact, a material obtained by subjecting stainless steel or steel material to hard chrome plating treatment can be mentioned. .
The shape of the plate piece is not particularly limited as long as it can reduce the leakage of pressurized steam, but it is preferably a flat plate shape.

  The labyrinth nozzle 24 may be extended from all the inner wall surfaces 22 in the labyrinth seal portion 20, or may be extended from the inner wall surface 22 except for some wall surfaces. That is, as shown in FIG. 3, the integrated labyrinth nozzle 24 may extend from all inner wall surfaces 22 of the labyrinth seal portion 20 toward the yarn Z that travels inside the labyrinth seal portion 20. A pair of labyrinth nozzles 24 are extended from the respective inner wall surfaces 22 facing vertically to the yarn Z traveling in the labyrinth seal portion 20, and are opened by the pair of labyrinth nozzles 24 and the left and right inner wall surfaces 22. The part 26 may be formed. Alternatively, the integrated labyrinth nozzle 24 may be extended from all the inner wall surfaces 22 except the lower inner wall surface 22 toward the yarn Z traveling in the labyrinth seal portion 20.

  In the processing apparatus 1, the ratio (L / P) between the length L (FIG. 2) extending from the inner wall surface 22 of the labyrinth nozzle 24 and the pitch P (FIG. 2) between the adjacent labyrinth nozzles 24 is 0.3. Less than. The ratio (L / P) is preferably 0.12 to 0.29, and more preferably 0.17 to 0.26. When the ratio (L / P) is less than 0.3, the eddy current of the pressurized steam in the expansion chamber 28 is sufficiently generated, and the effect of reducing the leakage amount of the pressurized steam is excellent. Therefore, the occurrence of fluff and yarn breakage on the yarn Z can be suppressed.

The extending length L of the labyrinth nozzle 24 from the inner wall surface 22 is preferably 3 mm or more, and more preferably 4 to 6 mm.
If the extending length L is 3 mm or more, the size of the expansion chamber 28 is large enough to generate a vortex flow, so that the effect of reducing the amount of pressurized steam leakage is improved. Moreover, if the extended length L is 6 mm or less, it is easy to prevent the expansion chamber 28 from becoming too large and eddy currents from being easily generated.

The pitch P between adjacent labyrinth nozzles 24 is preferably 16 to 29 mm, and more preferably 18 to 25 mm.
If the pitch P is 16 mm or more, the ratio of the pressurized steam that passes without staying in the expansion chamber 28 is reduced, and it becomes easy to generate sufficient vortex flow in the expansion chamber 28. Further, when the pitch P exceeds 29 mm, the frequency of vortex flow hardly changes. Therefore, if the pitch P is 29 mm or less, a sufficient number of labyrinth nozzles 24 can be secured, and the effect of reducing the amount of pressurized steam leakage is reduced. Sufficiently easy to obtain.

Moreover, in the processing apparatus 1, while making ratio (L / P) less than 0.3, the thickness a (FIG. 2) of the board piece which forms the labyrinth nozzle 24 shall be 3 mm or less. By setting the ratio (L / P) and the thickness a of the plate pieces within the above ranges, the pressurized steam treatment apparatus is excellent in the effect of reducing the leakage amount of pressurized steam. If the thickness a of the plate piece exceeds 3 mm, the rectifying effect of the pressurized steam by the labyrinth nozzle 24 in the opening 26 becomes strong, and the generation of the vortex in the expansion chamber 28 is suppressed.
The thickness a of the plate piece is preferably 0.5 to 3 mm from the viewpoint of improving the effect of reducing the amount of leakage of pressurized steam, and the effect of reducing the strength of the plate piece and the amount of leakage of pressurized steam. It is more preferable that it is 1-2 mm from the point which is excellent in coexistence.
Moreover, if the thickness a of the board piece which forms the labyrinth nozzle 24 is 3 mm or less, the thickness of the opposing board piece may differ. For example, the thickness of the upper plate piece of the labyrinth nozzle 24 may be 1 mm, and the thickness of the lower plate piece may be 3 mm.

  The number of forming stages of the labyrinth nozzle 24 is preferably 20 to 80. If the number of forming stages of the labyrinth nozzle 24 is 20 or more, the number of expansion chambers 28 increases, so that the number of vortex generation and extinction increases. It becomes easy to suppress the occurrence of fluff and yarn breakage. Further, when the number of forming stages of the labyrinth nozzle 24 exceeds 80, the effect of reducing the leakage amount of the pressurized steam hardly changes. Therefore, if the number of forming stages of the labyrinth nozzle 24 is 80 or less, it is possible to prevent the processing apparatus 1 from becoming too complicated, and the threading operation of the yarn Z into the processing apparatus 1 is facilitated.

As shown in FIG. 3, the opening 26 formed by the labyrinth nozzle 24 is preferably formed in a slit shape extending in the horizontal direction. If the opening 26 is slit-like, the yarn Z traveling in the processing apparatus 1 can be kept flat, so that the pressurized steam blown out in the pressurized steam processing unit 10 reaches the inside of the yarn Z. Invasion and reaching can be promoted. Therefore, it becomes easy to heat the yarn Z uniformly in a short time by pressurized steam.
Moreover, it is preferable that the opening part 26 is formed in the center of the height direction of the labyrinth seal part 20. Thereby, in the upper and lower regions delimited by the yarn Z that runs in the labyrinth seal portion 20 of the expansion chamber 28, the flow of the pressurized steam is prevented from being different and the running of the yarn Z is prevented from becoming unstable. It becomes easy to do.

  The ratio (H / W) (FIG. 3) of the width W to the height H of the opening 26 is preferably 1/1800 to 1/60. If the ratio (H / W) is 1/1800 or more, particularly in the multi-thread processing in which a plurality of yarns Z are run, interference between the yarns Z that run adjacent to each other is reduced, and damage caused thereby. It is easy to suppress fiber mixing, and it is easy to suppress the occurrence of fluff and yarn breakage on the yarn Z. Moreover, if the said ratio (H / W) is 1/60 or less, it will become easy to make it compatible with keeping the thread Z flat and reducing the amount of leaks of pressurized steam.

Further, the processing device 1 can be divided into two parts, an upper part and a lower part of the yarn Z that travels inside the device because the yarn Z can be easily passed through the device. It is preferable. Thereby, in particular, when a plurality of yarns Z are run in the processing apparatus 1 and are collectively stretched in a pressurized steam atmosphere, the threading operation can be easily performed in a short time.
When the processing apparatus 1 is divided into two, the opening / closing mechanism between the divided apparatus main bodies is not particularly limited. For example, a mechanism for opening and closing the divided apparatus main bodies by a hinge can be employed. Alternatively, a method of lifting and closing the upper device main body portion to be divided may be employed. Further, in such a case, in order to prevent the pressurized steam from leaking from the joint portion between the apparatus main bodies, it is preferable that the joint portion between the apparatus main bodies divided by using a clamp or the like is sealed.

In addition, the pressurization steam processing apparatus of this invention is not limited to the processing apparatus 1 illustrated in FIGS. For example, when traveling a plurality of yarns Z adjacent to each other, the yarn inlet 30 and the yarn are prevented from preventing the yarns Z from interfering with each other and causing the yarns Z to be damaged or mixed. A guide for splitting may be provided in the vicinity of the strip outlet 32.
The processing device 1 is a device that travels the yarn Z in the horizontal direction, but may be a pressure steam processing device that travels the yarn Z in the vertical direction.

  The yarn Z may be appropriately selected depending on the use. For example, the production of carbon fibers such as a yarn obtained by spinning a spinning stock solution containing a polyacrylonitrile-based polymer and stretching it in a bath for drying and densification. Threads used in

Further, the shape of the labyrinth nozzle 24 is not limited to the flat plate illustrated in FIGS.
For example, a labyrinth nozzle 24 (FIG. 4A) in which a flange extends from the end edge in the running direction of the yarn Z, and a labyrinth nozzle 24 in which one side surface is linearly inclined (FIG. 4). (B)), a labyrinth nozzle 24 (FIG. 4C) in which one side surface is inclined in an arc shape, and a labyrinth nozzle 24 (FIG. 4D) in which both side surfaces are linearly inclined. A labyrinth nozzle 24 (FIG. 4E) whose side surface is inclined in an arc shape, and a labyrinth nozzle 24 whose one side surface is linearly inclined and the other side surface is inclined in an arc shape. It is also possible (FIG. 4 (f)).

[Pressurized steam treatment method]
Hereinafter, as an example of the embodiment of the pressure steam treatment method for a yarn according to the present invention, a method for subjecting the yarn Z to a pressure steam treatment using the processing apparatus 1 will be described.
In the method according to the present embodiment, the yarn Z is introduced from the yarn inlet 30 into the labyrinth seal portion 20 on the primary side, passes through each opening 26 and the expansion chamber 28, and then the yarn of the pressure steam processing portion 10. After passing through the traveling portion 18, it passes through each opening 26 and the expansion chamber 28 in the labyrinth seal portion 20 on the secondary side and is led out from the yarn outlet 32 and sent to the next step.

  A known process can be used as the process before the yarn Z is introduced into the yarn entrance 30. For example, an acrylonitrile homopolymer or an acrylonitrile polymer composed of a copolymer of acrylonitrile and another monomer is dissolved in a known organic or inorganic solvent to form a spinning stock solution, and the spinning stock solution is spun. The method of introduce | transducing into the thread | yarn entrance 30 later, and the extending | stretching process in a pressurized steam atmosphere using the pressurized steam processing method of this invention is mentioned. In this case, the spinning method may be any of so-called wet, dry wet, and dry methods, and in the subsequent steps, treatments such as solvent removal, stretching in a bath, oil agent adhesion treatment, and drying may be performed. The stretching process under a pressurized steam atmosphere using the pressurized steam processing apparatus of the present invention may be carried out at any stage in the process, but in the case of solution spinning as described above, It is preferable to carry out after removing the solvent to some extent, that is, after washing the spun yarn, drawing in a bath, or drying.

The introduction of the yarn Z into the processing apparatus 1 in the method of the present invention is performed with the filling rate F represented by the following formula being 0.5 to 10%. The filling rate F is a ratio of the cross-sectional area of the yarn Z to the opening area of the opening 26.
F = [K / (ρ × 10 ⁵ )] / A
However, in the formula, K is the yarn fineness (tex), ρ is the yarn density (g / cm ³ ), and A is the opening of the opening 26 formed by the labyrinth nozzle 24 in the labyrinth seal portion 20. Area (cm ² ).
The filling rate F is derived as follows. That is, the yarn Z having a yarn fineness of K (tex) = K / 1000 (g / m) = K × 10 ⁻⁵ (g / cm) and a yarn density of ρ (g / cm ³ ) is broken. If the area is S ₀ (cm ² ), then S ₀ = K / (ρ × 10 ⁵ ) (cm ² ). The filling rate F is obtained by dividing the cross-sectional area S ₀ of the yarn Z by the opening area A (cm ² ) of the opening 26.

  If the filling rate F is 0.5% or more, the effect of reducing the leakage amount of pressurized steam is improved. If the filling rate F is 10% or less, the yarn Z and the labyrinth nozzle 24 come into contact with each other, the yarn Z is damaged, or the adjacent yarns Z interfere with each other to mix with the yarn Z. It is easy to suppress the occurrence of.

  In the pressurizing steam processing unit 10, steam is supplied from the steam inlet 12 into the pressurizing steam processing unit 10, and the supplied steam is pressurized in the pressurizing chamber 16 to be pressurized steam, and then the pressurization is performed. Steam is blown out from each hole of the wall portion 14 to the yarn Z traveling in the yarn traveling path 18. As a result, the yarn Z is heated by the pressurized steam in the yarn traveling path 18, and the pressurized steam treatment can be performed.

  The pressure in the pressurizing chamber 16, that is, the pressure of the pressurizing steam may be set according to the use, and the type of the yarn Z to be processed, the processing state in the previous process of the pressurizing steam processing, or the target fiber What is necessary is just to adjust suitably according to a characteristic. For example, when performing the extending | stretching process of the yarn Z under a pressurized steam atmosphere using the pressurized steam processing apparatus of this invention, it is normally adjusted to about 200-500 kPa.

  The pressurized steam blown into the yarn traveling path 18 heats the yarn Z and then tries to leak out of the processing apparatus 1 through the labyrinth seal portion 20. At this time, in the method of this embodiment, when the pressurized steam passes through the plurality of openings 26 and the expansion chamber 28 in the labyrinth seal portion 20 continuously, the pressurized steam that has entered the expansion chamber 28 rapidly expands. Then, since the compression is gradually repeated until the next opening 26 is reached, the generation and disappearance of the vortex is effectively and frequently repeated. As a result, since the pressurized steam is extremely consumed and depressurized while passing through the labyrinth seal portion 20, leakage of the pressurized steam from the yarn inlet 30 and the yarn outlet 32 of the labyrinth seal portion 20 occurs. The amount is reduced. Thereby, generation | occurrence | production of fluff and thread breakage in the yarn Z can be suppressed.

As described above, the pressurized steam treatment apparatus of the present invention is excellent in the effect of reducing the amount of pressurized steam leaking from the inside of the apparatus, and can obtain a high-quality yarn. In addition, according to the pressurized steam treatment method for yarns of the present invention, it is possible to obtain high-quality yarns in which the occurrence of fluff and yarn breakage is suppressed. In addition, since the amount of pressurized steam leaking from the inside of the apparatus is reduced, the amount of steam used can also be suppressed.
This is because in the pressurized steam treatment apparatus of the present invention, the ratio (L / P) is less than 0.3 and the thickness a of the plate piece forming the labyrinth nozzle 24 is 3 mm or less, so This is because the amount of pressure steam leakage is greatly reduced and the turbulence of the air flow of the pressurized steam in the apparatus is suppressed, so that various processes such as the running of the yarn Z in the processing apparatus and the stretching process can be performed stably. it is conceivable that.

  The pressure steam treatment apparatus and the pressure steam treatment method of the present invention are not particularly limited in the type of yarn Z (fiber) to be applied and the treatment process, but it is intended to obtain fine fibers and highly oriented fibers. In some cases, or when a high spinning speed is required, it can be suitably used as a stretching apparatus and a stretching method. In particular, it can be used suitably for the drawing process in the production of polyacrylonitrile-based polymer fibers for acrylic fibers and carbon fibers. Moreover, the pressurized steam processing apparatus and the pressurized steam processing method of the present invention are particularly effective for processing yarns having several thousand filaments or more, and high stretchability can be obtained.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited by the following description.
Evaluation of the leak amount of the pressurized steam in the pressurized steam treatment of this example was performed by measuring the steam flow rate [kg / hr · m] in the pressurized steam treatment apparatus.

[Production Example 1]
A polyacrylonitrile polymer obtained by copolymerizing acrylonitrile (AN), methyl acrylate (MA), and methacrylic acid (MAA) at a molar ratio AN / MA / MAA = 96/2/2 was converted into a dimethylacetamide (DMAc) solution (polymer). A spinning stock solution is prepared by dissolving in a concentration of 20% by mass, a viscosity of 50 Pa · s, and a temperature of 60 ° C., and the spinning raw solution is passed through a spinneret having 12,000 holes, and a DMAc aqueous solution having a concentration of 70% by mass and a liquid temperature of 35 ° C. It was discharged into the interior, washed with water, stretched 3 times in a hot water bath, and dried at 135 ° C. to obtain a densified yarn Z.

[Example 1]
In the processing apparatus 1 illustrated in FIG. 1, the total length of the pressurized steam processing unit 10 in the traveling direction of the yarn Z is 1000 mm, and the total length of the labyrinth seal unit 20 in the traveling direction of the yarn Z is 600 mm (however, the labyrinth seal unit 20 Is the length of the labyrinth seal portion 20 on one side, and two full-length labyrinth seal portions 20 are provided before and after the pressurized steam processing portion 10. The same applies hereinafter. The extension length L from the inner wall surface 22 is 5 mm, the pitch P between adjacent labyrinth nozzles 24 is 20 mm, the ratio L / P between the extension length L and the pitch P is 0.25, and the labyrinth nozzle 24 is formed. A processing apparatus in which the thickness a of the plate piece is 1 mm, the number of stages of the labyrinth nozzle 24 is 30, the height H of the opening 26 is 2 mm, the width of the opening 26 is 300 mm, and H / W is 1/150. It was used.
Using the processing apparatus, the yarn Z obtained in Production Example 1 was introduced from the yarn inlet 30 with one spindle to perform a pressure steam treatment. The pressure in the pressurizing chamber 16 was 300 kPa.

[Examples 2 to 4]
The yarn is the same as in Example 1 except that the pitch P between the adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, and the number of stages of the labyrinth nozzles 24 are changed as shown in Table 1. A pressurized steam treatment of strip Z was performed.

[Comparative Example 1]
The yarn is the same as in Example 1 except that the pitch P between the adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, and the number of stages of the labyrinth nozzles 24 are changed as shown in Table 1. A pressurized steam treatment of strip Z was performed.
Table 1 and FIG. 5 show the results of measuring the steam flow rate in the pressurized steam treatment of Examples 1 to 4 and Comparative Example 1.

As shown in Table 1 and FIG. 5, in Examples 1 to 4 using the pressurized steam treatment apparatus of the present invention having a ratio (L / P) of less than 0.3, the steam flow rate was small, and the pressure from the apparatus There was little steam leakage. In Examples 1 to 4, Examples 1 and 2 having a pitch P of 20 mm and 25 mm were superior to Examples 3 and 4 having a pitch of 20 mm and 25 mm in reducing the amount of pressurized steam leakage. .
On the other hand, in Comparative Example 1 in which the pitch P between adjacent labyrinth nozzles 24 is 7 mm and the ratio (L / P) is 0.3 or more, the amount of pressurized steam leaked is reduced compared to Examples 1-4. It was inferior to the effect.

[Example 5]
In the processing apparatus 1 illustrated in FIG. 1, the total length of the pressurized steam processing unit 10 in the traveling direction of the yarn Z is 1000 mm, the total length of the labyrinth seal unit 20 in the traveling direction of the yarn Z is 1500 mm, and the inner wall surface of the labyrinth nozzle 24. The extension length L from 22 is 5 mm, the pitch P between the adjacent labyrinth nozzles 24 is 25 mm, the ratio L / P of the extension length L to the pitch P is 0.20, and the plate piece forming the labyrinth nozzle 24 A processing apparatus having a thickness a of 1 mm, a number of stages of the labyrinth nozzle 24 of 60, a height H of the opening 26 of 2 mm, a width of the opening 26 of 300 mm, and H / W of 1/150 was used.
Using the processing apparatus, the yarn Z obtained in Production Example 1 was introduced from the yarn inlet 30 with one spindle to perform a pressure steam treatment. The pressure in the pressurizing chamber 16 was 300 kPa.

[Examples 6 to 7]
The pressurized steam treatment of the yarn Z was performed in the same manner as in Example 5 except that the thickness a of the plate piece forming the labyrinth nozzle 24 was changed as shown in Table 1.

[Comparative Example 2]
The pressurized steam treatment of the yarn Z was performed in the same manner as in Example 5 except that the thickness a of the plate piece forming the labyrinth nozzle 24 was changed as shown in Table 1.
Table 1 and FIG. 6 show the results of measuring the steam flow rate in the pressurized steam treatment of Examples 5 to 7 and Comparative Example 2.

As shown in Table 1 and FIG. 6, in Examples 5 to 7 using the pressurized steam treatment apparatus of the present invention in which the thickness a of the plate piece is 3 or less, the steam flow rate is small, and the leakage of pressurized steam from the apparatus The amount was small. Further, the most excellent effect was shown in Example 5 in which the thickness a of the plate piece was 1 mm.
On the other hand, in Comparative Example 2 in which the thickness a of the plate piece exceeded 3 mm, the effect of reducing the amount of pressurized steam leaked was inferior to Examples 5-7.

[Example 8]
In the processing apparatus 1 illustrated in FIG. 1, the total length of the pressurized steam processing unit 10 in the traveling direction of the yarn Z is 1000 mm, the total length of the labyrinth seal unit 20 in the traveling direction of the yarn Z is 1500 mm, and the inner wall surface of the labyrinth nozzle 24. The extension length L from 22 is 2 mm, the pitch P between the adjacent labyrinth nozzles 24 is 25 mm, the ratio L / P between the extension length L and the pitch P is 0.08, and the plate piece forming the labyrinth nozzle 24 A processing apparatus having a thickness a of 2 mm, a number of stages of the labyrinth nozzle 24 of 60, a height H of the opening 26 of 2 mm, a width of the opening 26 of 300 mm, and a H / W of 1/150 was used.
Using the processing apparatus, the yarn Z obtained in Production Example 1 was introduced from the yarn inlet 30 with one spindle to perform a pressure steam treatment. The pressure in the pressurizing chamber 16 was 300 kPa.

[Examples 9 to 11]
The pressurized steam treatment of the yarn Z was performed in the same manner as in Example 8 except that the extension length L from the inner wall surface 22 of the labyrinth nozzle 24 was changed as shown in Table 1.
Table 1 and FIG. 7 show the results of measuring the steam flow rate in the pressurized steam treatment of Examples 6 and 8 to 11 and Comparative Example 3.

  As shown in Table 1 and FIG. 7, in Examples 8 to 11 using the pressurized steam treatment apparatus of the present invention having a ratio (L / P) of less than 0.3, the steam flow rate was small, and the pressure from the apparatus There was little steam leakage. Further, from the comparison between Examples 6 and 8 to 11, an example in which the extension length L of the labyrinth nozzle 24 is 3 mm or more and the effect of reducing the leakage amount of the pressurized steam is particularly excellent, and the extension length L is 5 mm. 6 showed the most excellent effect.

[Example 12]
In the processing apparatus 1 illustrated in FIG. 1, the total length of the pressurized steam processing unit 10 in the traveling direction of the yarn Z is 1000 mm, the total length of the labyrinth seal unit 20 in the traveling direction of the yarn Z is 1500 mm, and the inner wall surface of the labyrinth nozzle 24. The extension length L from 22 is 5 mm, the pitch P between adjacent labyrinth nozzles 24 is 20 mm, the ratio L / P between the extension length L and the pitch P is 0.25, and the plate piece forming the labyrinth nozzle 24 A processing apparatus having a thickness a of 1 mm, a number of stages of the labyrinth nozzle 24 of 75, a height H of the opening 26 of 2 mm, a width of the opening 26 of 300 mm, and H / W of 1/150 was used.
Using the processing apparatus, the yarn Z obtained in Production Example 1 was introduced from the yarn inlet 30 with one spindle to perform a pressure steam treatment. The pressure in the pressurizing chamber 16 was 300 kPa.

[Examples 13 to 27]
As shown in Table 2, the pitch P between adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, the thickness a of the plate pieces forming the labyrinth nozzle 24, and the number of steps of the labyrinth nozzle 24 are changed. Except that, the pressure steam treatment of the yarn Z was performed in the same manner as in Example 12.

[Comparative Examples 3 to 6]
As shown in Table 2, the pitch P between adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, the thickness a of the plate pieces forming the labyrinth nozzle 24, and the number of steps of the labyrinth nozzle 24 are changed. Except that, the pressure steam treatment of the yarn Z was performed in the same manner as in Example 12.

[Example 28]
As shown in Table 2, the pitch P between adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, the thickness a of the plate pieces forming the labyrinth nozzle 24, and the number of steps of the labyrinth nozzle 24 are changed. Then, the pressurized steam treatment of the yarn Z was performed in the same manner as in Example 12 except that the pressure in the pressurizing chamber 16 was set to 200 kPa.

[Comparative Example 7]
As shown in Table 2, the pitch P between adjacent labyrinth nozzles 24, the ratio L / P of the extended length L to the pitch P, the thickness a of the plate pieces forming the labyrinth nozzle 24, and the number of steps of the labyrinth nozzle 24 are changed. Then, the pressurized steam treatment of the yarn Z was performed in the same manner as in Example 12 except that the pressure in the pressurizing chamber 16 was set to 200 kPa.
The results of measuring the steam flow rate in the pressurized steam treatment of Examples 12 to 28 and Comparative Examples 3 to 7 are shown in Table 2 and FIG.

As shown in Table 2 and FIG. 8, in Examples 12 to 28 using the pressurized steam treatment apparatus of the present invention in which the ratio (L / P) is less than 0.3 and the thickness a of the plate piece is 3 mm or less, steam is used. The flow rate was small, and the amount of pressurized steam leaked from the device was small.
In addition, Examples 12 to 17 having a pitch P of 20 to 25 mm are more effective in reducing the amount of leakage of pressurized steam than Example 18 having a pitch P of 30 mm. An effect equivalent to or higher than that of Comparative Example 7 (200 kPa) lower than 17 (300 kPa) was exhibited. In particular, Example 14 having a pitch P of 22 mm was most excellent in the effect of reducing the amount of leakage of pressurized steam.
In addition, the smaller the thickness a of the plate piece, the better the effect of reducing the leakage of pressurized steam, and 1 mm showed a particularly excellent effect (Examples 12 to 18).
Further, in Example 28 in which the pressure in the pressurizing chamber 16 was 200 kPa, the amount of leakage of pressurized steam was smaller than those in Examples 17 to 27 in which the pressure in the pressurizing chamber 16 was 300 kPa.

  On the other hand, in Comparative Examples 3 to 6 in which the pitch P is 15 mm and the ratio (L / P) is 0.3 or more, the effect of reducing the leakage amount of the pressurized steam as compared with the example in which the thickness a of the plate pieces is the same It was inferior to. Similarly, in Comparative Example 7, the effect of reducing the leakage amount of pressurized steam was inferior to that of Example 28 where the pressure in the pressurized chamber 16 was the same.

[Examples 29 to 33]
In the processing apparatus 1 illustrated in FIG. 1, the total length of the pressurized steam processing unit 10 in the traveling direction of the yarn Z is 1000 mm, the total length of the labyrinth seal unit 20 in the traveling direction of the yarn Z is 1500 mm, and the inner wall surface of the labyrinth nozzle 24. The extension length L from 22 is 5 mm, the pitch P between adjacent labyrinth nozzles 24 is 25 mm, the ratio L / P between the extension length L and the pitch P is 0.20, and the number of stages of the labyrinth nozzles 24 is 60. Using a processing apparatus in which the height H of the opening 26 is 2 mm, the width of the opening 26 is 300 mm, and the H / W is 1/150, the thickness a of the plate piece forming the labyrinth nozzle 24 is as shown in Table 3. Then, the yarn Z obtained in Production Example 1 was introduced by one spindle from the yarn inlet 30 and subjected to pressure steam treatment. The pressure in the pressurizing chamber 16 was 300 kPa.
The results of measuring the steam flow rate in the pressure steam treatment of Examples 29 to 33 are shown in Table 3 and FIG.

  As shown in Table 3 and FIG. 9, in Examples 29 to 32, the thickness a of the plate piece is excellent in the effect of reducing the amount of leakage of the pressurized steam, and particularly excellent in Example 32 of 1 mm. Showed the effect. In addition, from the results of Example 33, even if the thickness a of the upper and lower plate pieces of the labyrinth nozzle 24 is different, the thickness of each of the plate pieces is 3 mm or less. It was found that the effect of reducing the leakage amount was excellent.

It is the longitudinal cross-sectional view which showed schematic structure of one Example of the pressurized steam processing apparatus of this invention. It is sectional drawing to which the part of the labyrinth nozzle of the pressurized steam processing apparatus of FIG. 1 was expanded. It is a longitudinal cross-sectional view of the part in which the labyrinth nozzle was formed in the labyrinth seal part of FIG. It is sectional drawing which showed an example of the cross-sectional shape of a labyrinth nozzle. It is the figure which showed the measurement result of the steam flow rate of Examples 1-4 and the comparative example 1. FIG. It is the figure which showed the measurement result of the steam flow rate of Examples 5-7 and Comparative Example 2. It is the figure which showed the measurement result of the steam flow rate of Example 6 and 8-11. It is the figure which showed the measurement result of the steam flow rate of Examples 12-28 and Comparative Examples 3-7. It is the figure which showed the measurement result of the steam flow rate of Examples 29-33.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Pressurized steam processing apparatus 10 Pressurized steam processing part 20 Labyrinth seal part 22 Inner wall surface 24 Labyrinth nozzle 26 Opening part Z Yarn

Claims (4)

A pressurizing steam processing section that processes the yarn traveling in a certain direction with the pressurizing steam, and two labyrinth seal sections extending from before and after the pressurizing steam processing section,
In the pressurized steam processing apparatus, the labyrinth seal portion has a plurality of labyrinth nozzles made of plate pieces extending perpendicularly from the inner wall surface of the labyrinth seal portion toward the yarn.
The ratio (L / P) of the extension length L from the inner wall surface of the labyrinth nozzle to the pitch P between adjacent labyrinth nozzles is less than 0.3, and the thickness of the plate piece is 3 mm or less. A pressurizing steam processing apparatus for a yarn characterized by that.   The pressurized steam treatment apparatus for yarn according to claim 1, wherein the pitch P is 16 to 29 mm.   The yarn pressure steam treatment apparatus according to claim 1 or 2, wherein the length L is 3 mm or more. Yarn subjected to pressure steam treatment using the pressure steam treatment apparatus for yarn according to any one of claims 1 to 3 with a filling rate F represented by the following formula of 0.5 to 10%. Pressure steam treatment method for strips.
F = [K / (ρ × 10 ⁵ )] / A
However, in the formula, K is the yarn fineness (tex), ρ is the yarn density (g / cm ³ ), and A is the opening area of the opening formed by the labyrinth nozzle in the labyrinth seal portion ( cm ² ).

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