JP4062015B2 - Yarn Crimping Nozzle and Yarn Crimping Method - Google Patents

Description

【００８６】
【表２】

【００８７】
【発明の効果】
本発明によれば、糸条の仮撚りを防止することで、高捲縮で品質の安定した捲縮糸を、低繊度まで操業性良好に製造することができる糸条の捲縮加工ノズル、および該捲縮加工ノズルを用いた糸条の捲縮加工方法を提供することができる。
【図面の簡単な説明】
【図１】この図は、流体処理法の本発明の捲縮加工ノズルの一例を示す縦断面図である。
【図２】この図は、閉塞部材によるベンチュリーの噴出孔の閉塞の様子を具体的に示した一例の図である。
【図３】この図は、閉塞部材によるベンチュリーの噴出孔の閉塞の様子を具体的に示した一例の図である。
【図４】この図は、糸条の糸幅を規制する部材を、ベンチュリー噴出孔の一部を閉塞する閉塞部材１８に取り付けた様子を具体的に示した一例の斜視図である。
【図５】この図は、糸幅を規制する部材と、閉塞部材とを組み合わせて一体とした部材、すなわちアダプターの一例を具体的に示した斜視図である。
【図６】この図は、糸条の堆積室を連接させて、流体押し込み式に構成した本発明の捲縮加工ノズルの一例を示す縦断面図である。
【図７】この図は、ドーナツ状のスリット板２６とスペーサー２７とを交互に積層させる一例を示す斜視図である。
【符号の説明】
１：ハウジング
２：加熱流体導入孔
３：糸条導入孔
４：ニードル
５：噴出孔
６：ベンチュリー
７：流体供給部
８：噴射ノズル部
９：ニードルの中心線
１０：ベンチュリー噴出孔の中心線
１１：捲縮ノズルから排出される糸条を進行させる方向
１２：偏心量
１３：糸条
１４：移動スクリーン
１５：糸条の排出方向
１６：加熱流体が排出される方向
１７：移動スクリーンの回転方向
１８：閉塞部材
１９：ベンチュリー噴出孔の端面部
２０：閉塞部材の端部
２１：ベンチュリー噴出孔の最狭隘部
２２：糸幅を規制する部材
２３：堆積室
２４：流体吸引孔
２５：堆積室ハウジング
２６：スリット板
２７：スペーサー
２８：堆積空間
２９：堆積室出口
３０：軸棒[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crimping nozzle for crimping thermoplastic fiber yarns. More specifically, the present invention relates to a crimped yarn having high crimps and stable quality by preventing false twisting of the yarn, and having a low fineness. The present invention relates to a yarn crimping nozzle that can be manufactured with good operability and a method for crimping a yarn using the crimping nozzle.
[0002]
[Prior art]
As a method of crimping a thermoplastic fiber yarn such as polyamide, polyester, polyolefin, etc., a method of applying a heating fluid such as steam or superheated air by a heated fluid jet nozzle to impart crimp to the fiber yarn, that is, a fluid A processing method and a fluid pushing method are known.
[0003]
The fiber yarns crimped by these methods have the advantage that they have good crimp characteristics and uniform dyeability and have a stable quality. Furthermore, since it can be crimped at high speed and has excellent productivity, it is widely used in the production of crimped yarns for carpets and the like.
[0004]
As crimping nozzles used so far, those described in Japanese Patent Publication No. 58-1214, Japanese Patent Application Laid-Open No. 8-269634, Japanese Patent Application Laid-Open No. 8-269835, and the like are known. In the case of the fluid treatment method, any of these is a housing having a heated fluid introduction hole communicating with the fluid supply unit, a needle having a yarn introduction hole and attached to one end of the housing, and an ejection hole. A yarn introduction hole, a fluid supply part, and an injection nozzle part are formed by a venturi attached to the other end. In the case of the fluid push-in method, the yarn accumulation chamber is further connected after the venturi.
[0005]
In any case, the fiber yarn is supplied from the yarn introduction hole and the heating fluid is supplied from the fluid supply portion into the injection nozzle portion, and the turbulent flow of the heating fluid acts on the fiber yarn in the injection nozzle portion to cause crimping. It is given. Such a conventional crimping nozzle has a problem that has not been solved yet.
[0006]
The crimping nozzle described in Japanese Patent Publication No. 58-1214 relates to a fluid processing method. In this publication, the end surface of the venturi on the yarn discharge side is closer to the moving screen that causes the fluid discharged from the crimping nozzle and the yarn to collide with each other. The crimping nozzle comprised with the level | step-difference part which consists of a part is proposed. As a result, the fluid discharged from the venturi and the yarn are separated quickly, and the yarn runs stably on the moving screen, so that the operability is improved and the crimp can be stably applied. However, a phenomenon in which a swirling component of the heated fluid is generated in the spray nozzle portion and the yarn is twisted, that is, “temporary twist” tends to occur. When false twisting occurs, the strength of twisting occurs in the longitudinal direction of the fiber, which causes a problem of uneven crimping. Further, when performing parallel crimping of multiple yarns, there is a problem in that a difference between weights occurs in the physical properties of the crimped yarn between a weight where false twist is generated and a weight where false twist is not generated.
[0007]
In general, when a yarn is crimped, the yarn is guided to a crimping nozzle after preheating with a heating roller. However, when false twisting occurs, the twist of the yarn spreads over the upstream heating roller. However, there is a problem in operation that the yarn is tangled and broken when the yarn moves on the heating roller and comes into contact with another yarn.
[0008]
Furthermore, since false twisting tends to occur when the yarn has a low fineness, there is also a problem that the fineness of the yarn that can be produced is limited.
[0009]
The crimping nozzle described in JP-A-8-269834 relates to a fluid pushing method. This publication proposes a crimping nozzle in which at least a part of the yarn passage between the spray nozzle portion and the yarn accumulation chamber is inclined. As a result, the foldability of the yarn accumulated in the yarn accumulation chamber is improved, and there is an effect that the fluid can be stably pushed in with less tangling of the yarn. However, there is no effect to prevent false twisting. After all, even if crimped, the physical property difference between weights when performing parallel crimping of multiple yarns, the thread wound around the heating roller, the fineness that can be stably crimped Problems such as limitations remained.
[0010]
The crimping nozzle described in JP-A-8-269835 relates to a fluid treatment method and a fluid pushing method. In this publication, a crimping nozzle is proposed in which a part of the thread introduction hole of the needle is formed in an irregular cross-sectional shape. As a result, when the yarn is positioned at the corner of the irregular cross section in the needle, there was certainly a certain degree of false twist suppression effect. However, since the position of the thread in the needle is not always constant during crimping, in reality, false twisting cannot be completely prevented.
[0011]
As described above, the yarn crimping nozzle that can produce high-crimped and stable quality crimped yarn with good operability to low fineness by preventing false twisting of the yarn It was not obtained until.
[0012]
[Problems to be solved by the invention]
In view of the background of the above-described prior art, the present invention is a yarn capable of producing a crimped yarn having a high crimp and stable quality to a low fineness with good operability by preventing false twisting of the yarn. An object of the present invention is to provide a crimping nozzle for a strip and a method for crimping a yarn using the crimping nozzle.
[0013]
[Means for Solving the Problems]
  The present invention employs the following means in order to solve such problems. That is, the crimping nozzle of the present invention includes a housing having a heated fluid introduction hole communicating with a fluid supply unit, a needle having a yarn introduction hole and attached to one end of the housing, and an ejection hole. A yarn crimping nozzle in which a yarn introduction hole, a fluid supply portion, and an injection nozzle portion are formed by a venturi attached to the other end, and the diameter of the needle introduction hole of the needle at the end on the venturi side is 1 mm or more and 2 mm or less, and the needle and the venturi are eccentric, and the direction in which the yarn discharged from the crimping nozzle is advanced is defined as positive eccentricity with reference to the center line of the venturi ejection hole Further, the needle is eccentric in the plus direction, and the eccentric amount H (mm) satisfies the following formula (1).Then, a closing member for closing a part of the venturi ejection hole is provided at the end face of the venturi ejection hole on the opposite side to the direction in which the yarn discharged from the crimping nozzle is advanced.It is characterized by this.
[0014]
0.02 ≦ H / N ≦ 0.05 (1)
In the formula, N (mm) is the diameter of the narrowest narrow portion of the venturi ejection hole.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides the above-mentioned problem, that is, the crimping process of the yarn, which can produce a crimped yarn having high crimp and stable quality to a low fineness with good operability by preventing false twisting of the yarn. The present inventors have intensively studied the nozzle and have clarified that this problem can be solved by setting the eccentric amount of the needle and the venturi within a specific range.
[0016]
FIG. 1 shows an example of the crimping nozzle of the present invention. In FIG. 1, the crimping nozzle includes a housing 1 having a heated fluid introduction hole 2 communicating with a fluid supply portion 7, a needle 4 having a yarn introduction hole 3 attached to one end of the housing 1, and an ejection hole 5. And a venturi 6 attached to the other end of the housing 1. Here, the housing 1 alone has a hollow portion, and when combined with the needle 4 and the venturi 6, the crimped nozzle shown in FIG.
[0017]
A fluid supply unit 7 is formed between the housing 1 and the needle 4, and an injection nozzle unit 8 is formed between the needle 4 and the venturi 6. The yarn introduction hole 3 formed on the inner surface of the needle 4 functions as a yarn introduction portion.
[0018]
Here, in the conventional crimping nozzle, the needle 4 and the venturi 6 are usually eccentric. If the center line 10 of the venturi ejection hole is used as a reference, the needle center line 9 is eccentric by an eccentric amount 12 in the direction 11 in which the yarn 13 discharged from the crimping nozzle travels on the moving screen 14. It has become.
[0019]
When the needle and the venturi are eccentric in this way, the heated fluid traveling in the venturi ejection hole drifts. That is, the flow of fluid is small on the side where the needle is eccentric with respect to the center of the venturi, and the flow of fluid is increased on the opposite side. As a result, a force that pushes the needle in an eccentric direction acts on the yarn, and the yarn discharge direction 15 and the direction 16 in which the heated fluid is discharged are separated, so that the yarn can smoothly ride on the moving screen. The running is stabilized. In the example of FIG. 1, the moving screen 14 rotates in the direction of the rotation direction 17.
[0020]
And we studied to prevent false twisting, and found that false twisting was suppressed as the eccentricity of needle and venturi approached zero. When the needle and the venturi are eccentric, the heated fluid drifts in the venturi as described above. At this time, since the inner surface of the vent hole of the venturi has a circular cross section, the heated fluid that has drifted easily swirls inside, and false twisting occurred.
[0021]
On the other hand, when the eccentricity is zero, the heated fluid does not drift and flows uniformly symmetrically with respect to the central axis of the venturi ejection hole, so that no swirl flow occurs and false twisting does not occur.
[0022]
However, when the eccentricity is zero, false twisting can be prevented, but another problem occurs. First of all, there is a problem that the level of crimp applied is lowered and high crimp cannot be obtained. When it is eccentric, the yarn and the heated fluid are separated inside the venturi ejection hole as described above. For this reason, since the yarn is decelerated and the action by the heated fluid is strengthened, high crimping can be realized. On the other hand, when the eccentricity is zero, the yarn and the heated fluid are not separated, so that the speed reduction effect does not work on the yarn and the crimp level is lowered.
[0023]
Secondly, since the discharge direction 15 of the yarn and the discharge direction 16 of the heated fluid are the same without being separated, the discharge of the yarn from the crimping nozzle is unstable, and the yarn is moved on the moving filter. There is a problem that the vehicle does not run stably and the operability deteriorates.
[0024]
In the conventional crimping nozzle, the amount of eccentricity H (mm) between the needle and the venturi is N (mm) when the diameter of the narrowest flange portion 21 of the venturi ejection hole is N (mm).
0.1 ≦ H / N ≦ 0.15
It was relatively large.
[0025]
In the venturi shown in FIG. 1, a venturi ejection hole is constituted by a mortar-shaped portion facing the needle, a narrow constricted portion, and a portion expanding again in a trumpet shape from the side close to the needle. Therefore, the narrowest part of the venturi ejection hole corresponds to a narrowed part. Although the venturi ejection hole does not necessarily expand in a trumpet shape as shown in FIG. 1, it is preferable to expand it on the trumpet as shown in FIG.
[0026]
As described above, both the case where the needle and the venturi are eccentric and the case where the needle and the venturi are not eccentric are problematic. Here, we examined the amount of eccentricity in detail, and by setting the eccentricity of the needle and the venturi to a very small amount within a certain range, the problem of false twisting in a conventional crimped nozzle with eccentricity was reduced to zero. They have found that both the reduction of the crimp level in the crimping nozzle and the deterioration of operability can be solved.
[0027]
The crimping nozzle of the present invention includes a housing having a heated fluid introduction hole communicating with a fluid supply unit, a needle having a yarn introduction hole and attached to one end of the housing, and an ejection hole having the other end of the housing. A yarn crimping nozzle in which a yarn introduction hole, a fluid supply portion and an injection nozzle portion are formed by a venturi attached to the needle, and the diameter of the yarn introduction hole of the needle at the tip on the venturi side is 1 mm or more 2 mm or less, and the needle and the venturi are eccentric, and when the direction in which the yarn discharged from the crimping nozzle is advanced is defined as the eccentric in the plus direction with respect to the center line of the venturi ejection hole, It is necessary that the needle is eccentric in the plus direction and the eccentric amount H (mm) satisfies the following formula (1).
[0028]
0.02 ≦ H / N ≦ 0.05 (1)
In the formula, N (mm) is the diameter of the narrowest narrow portion of the venturi ejection hole.
[0029]
When the diameter of the yarn introducing hole is less than 1 mm, the yarn passing property is deteriorated and the yarn breakage frequently occurs. When the diameter of the yarn introduction hole exceeds 2 mm, the amount of fluid leaking from the yarn introduction hole is large, so that the tension of the yarn incident on the crimping nozzle is lowered and the yarn breakage occurs frequently. Preferably, the diameter of the yarn introduction hole is 1.2 mm or more and 1.8 mm or less. Here, the cross-sectional shape of the yarn introduction hole is preferably circular.
[0030]
When H / N is less than 0.02, false twisting does not occur, but the crimp level is lowered and high crimp is not obtained, and at the same time, the running stability of the plug on the moving screen is reduced. Operability deteriorates. On the other hand, when H / N exceeds 0.05, high crimp is obtained and the plug stability on the moving screen is good, but false twisting occurs and the above-mentioned various problems occur. It ends up.
[0031]
  In the crimping nozzle of the present invention, a closing member that blocks a part of the venturi ejection hole is provided at the end surface of the venturi ejection hole on the opposite side to the direction in which the yarn discharged from the crimping nozzle advances. To provideis necessary. In this case, part of the heated fluid that is about to be discharged from the vent hole of the venturi is blocked by the closing member 18. For this reason, the component of the heating fluid in the direction 11 in which the yarn discharged from the crimping nozzle advances is further increased. And the effect which presses a thread | yarn is expressed more in the advancing direction 11 of the thread | yarn discharged | emitted from a crimp nozzle. As a result, the plug running stability on the moving screen is higher.RuIt is. The shape of the closing member is arbitrary as long as it closes a part of the ejection hole on the side opposite to the direction in which the yarn advances in the end face on the venturi yarn discharge side. However, it is preferably symmetrical with respect to the direction in which the yarn proceeds.
[0032]
Specific examples of blocking by the blocking member are shown in FIGS. In the example of FIG. 2, the end surface portion 19 of the venturi ejection hole is closed in a half-moon shape by the closing member 18. In the example of FIG. 3, the end surface portion 19 of the venturi ejection hole is closed by a closing member 18 in a crescent shape.
[0033]
Moreover, the crimp nozzle of this invention is the area S1 (mm) of the part of the ejection hole which is blocked by the closing member at the end face of the venturi ejection hole.²) Preferably satisfies the following formula (2).
[0034]
0.05 ≦ S1 / S2 ≦ 0.30 (2)
In the formula, S2 (mm²) Is the cross-sectional area of the ejection hole at the end face of the venturi ejection hole.
[0035]
When S1 / S2 is within the range of the formula (2), the effect of improving the stability of the yarn traveling on the moving screen is sufficient, and the amount of the blockage is too large to deteriorate the thread passage. It is preferable without concern.
[0036]
In the crimping nozzle of the present invention, it is also preferable that the yarn discharged from the crimping nozzle is regulated by a member that regulates the yarn width. When the yarn width of the yarn discharged from the crimping nozzle is regulated by the member that regulates the yarn width, it is preferable because the running stability of the yarn is increased.
[0037]
FIG. 4 shows a perspective view of an example of a state in which the member 22 for regulating the yarn width of the yarn is attached to the closing member 18 that closes a part of the venturi ejection hole.
[0038]
In the present invention, it is also preferable to combine the member 22 that regulates the yarn width of the yarn and the closing member 18 that closes a part of the venturi ejection hole into an integral member.
[0039]
Especially when the center of the thread passage hole of the adapter and the center of the vent hole of the venturi are not made to coincide with each other, but the offset is made with respect to the center of the vent hole of the venturi, the venturi is ejected without providing a separate blocking member It is preferable because a part of the hole can be closed and the adapter can have an effect as a closing member. FIG. 5 shows a perspective view of an example of a member integrated with a member that regulates the yarn width and a closing member, that is, the adapter.
[0040]
  In addition, the crimping nozzle of the present invention may be configured as a fluid push-in type by connecting a yarn accumulation chamber next to the venturi so that the yarn discharged from the venturi ejection hole is pushed and accumulated. preferable. In the fluid indentation method, the yarn is discharged from the crimping apparatus in a state in which the yarn speed becomes substantially zero due to indentation deposition. ThereforeMoveThis is preferable because the running stability of the yarn on the moving screen is improved.
[0041]
FIG. 6 shows an example of a crimped nozzle constructed by connecting the yarn accumulation chambers in a fluid push-in manner. In the crimping nozzle of FIG. 6, a deposition chamber housing 25 having a fluid suction hole 24 communicating with the deposition chamber 23 is provided at the lower portion of the venturi 6. A large number of donut-shaped slit plates 26 and spacers 27 are alternately stacked in the deposition chamber housing 25.
[0042]
The fluid suction hole 24 is connected to a circuit whose pressure is reduced from the atmospheric pressure. A part of the heated fluid discharged from the venturi 6 is discharged out of the crimping nozzle through the fluid suction hole 24. As a result, the yarn immediately after being discharged from the venturi 6 has a considerable speed, but gradually loses its speed. Then, the doughnut-shaped slit plates 26 and spacers 27 provided in the deposition chamber 23 are pushed and deposited into the deposition space 28 formed by alternately laminating. The lump of yarn that has been pushed in and accumulated is gradually pushed out and moved, and is finally discharged out of the crimping nozzle through the deposition chamber outlet 29 together with a part of the heating fluid.
[0043]
FIG. 7 is a perspective view showing an example in which donut-shaped slit plates 26 and spacers 27 are alternately stacked. In the example of FIG. 7, slit plates 26 and spacers 27 are alternately stacked on the shaft 30. In FIG. 7, for the sake of clarity, the slit plate 26 and the spacer 27 are only one layer.
[0044]
In the present invention, the stretched yarn is preheated with a heating roller, then crimped with the crimping nozzle of the present invention, and further stretched between the take-up roller and the stretch roller, Finally, when winding with a winder, it is preferable to cool the yarn with a moving screen provided in front of the take-up roller and immediately after the crimping nozzle.
[0045]
The moving screen has a large number of holes in the surface, and the inside of the moving screen is evacuated under reduced pressure. For this reason, the yarn discharged from the crimping nozzle sticks to the moving screen surface and is cooled on the rotating moving screen. The cooled yarn is then taken up by the take-up roller and leaves the moving screen.
[0046]
It is also possible to take the yarn discharged from the crimping nozzle directly onto the take-up roller. However, since the crimped yarn can be sufficiently cooled to fix the crimp, a method of cooling the crimped yarn with a moving screen is preferable.
[0047]
Next, as an example of a typical method for producing a crimped yarn using the crimped nozzle of the present invention, a method for producing a polyamide crimped yarn for carpet is illustrated.
[0048]
The crimping nozzle of the present invention is incorporated into a known crimped yarn manufacturing method. That is, it is applied to a conventional crimped yarn manufacturing method in which a molten polymer is extruded from a die and spun, followed by cooling, oiling, drawing and crimping.
[0049]
As the melt spinning apparatus, both an extruder-type spinning machine and a pressure-type spinning machine can be used, but the former is preferable from the viewpoint of product uniformity and yield in the spinning process. In particular, when using an original polymer, an extruder type spinning machine is advantageous.
[0050]
The yarn is spun using various types of caps such as a round cross section and a modified cross section such as a Y shape. A shape such as a slit ratio of the nozzle discharge hole is selected in consideration of spinning conditions such as discharge amount, cooling condition, and take-up speed.
[0051]
The melt-spun yarn is cooled and solidified with cold air, and then supplied with oil and taken up at about 500 to 1500 m / min. The drawn yarn is subsequently stretched. In stretching, a steam processing device or the like may be used in combination for the purpose of, for example, fixing the stretching point as an auxiliary. In order to impart a high crimp, a certain degree of orientation and crystallization are required, and therefore it is preferable to perform stretching 2 to 5 times.
[0052]
The drawn yarn is preheated to 150 to 220 ° C. by a heating roller, and then led to the crimping nozzle of the present invention to give crimp. The crimping nozzle may be either a fluid processing method or a fluid pushing method. When it is necessary to make crimp latent, it is preferable to use a fluid indentation method.
[0053]
The crimped yarn is then cooled by a cooling device such as a moving filter (rotary filter) described in JP-A-3-137234, JP-A-3-137235, JP-A-8-284040, etc. Crimp is fixed.
[0054]
The cooled and crimped yarn is stretched to eliminate slack. Further, entanglement can be imparted as necessary for the purpose of improving passability in a subsequent process. Entanglement can be imparted by a known method. The tangled yarn is then wound into a package by a winder.
[0055]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
[0056]
Each physical property value in the above description and in the examples described below is specifically a value measured by the following method.
[Sulfuric acid relative viscosity]
A polymer sample was dissolved in 98% sulfuric acid at a concentration of 1% by weight and measured at 25 ° C. using an Ostwald viscometer.
[Total fineness]
Measured according to JIS L 1090.
[Crimp elongation after treatment with boiling water]
A crimped yarn unwound from a package that has been allowed to stand for 20 hours or more in an atmosphere of room temperature (25 to 35 ° C.) and a relative humidity of 50 to 75% is immersed in boiling water for 30 minutes in an unloaded state and then equilibrated. Dry to a moisture content and use this as a crimped yarn sample treated with boiling water. A sample length of 50 cm (L) was applied after 30 seconds had elapsed after applying an initial load that applied a tension of the indicated dtex × 0.0176 mN (1.8 mg / dtex) to the sample yarn.₁) Next, the sample length (L) was extended after 30 seconds after applying a constant load that gave a tension of the displayed dtex × 0.882 mN (90 mg / dtex) to the sample.₂). Next, the crimp elongation rate (%) is obtained by the following formula.
[0057]
Crimp elongation (%) = [(L₂-L₁) / L₁] × 100
Note that the atmosphere condition when the yarn is left before the boiling water treatment is the crimped yarn state when used in the actual carpet manufacturing process, that is, the state where the crimp characteristics have reached an equilibrium state due to moisture absorption. It is selected from the point that it does not take too much time to reach an equilibrium state and no condensation occurs.
[Deformation degree]
The cross-sectional photograph of the crimped yarn having a Y-shaped cross section was enlarged, and the ratio of each radius between the circumscribed circle and the inscribed circle of the single yarn was defined as the degree of deformation. It was calculated as the average value of the measurement of 5 single yarns.
[Degree of false twist]
Crimping nozzles of the same configuration were prepared for 20 holes, and N = 20 crimping was performed. Among them, the number of holes in which false twist did not occur and the yarn path on the heating roller did not move was counted, and the “success rate” in which false twist did not occur was expressed as a percentage.
[0058]
Then, the success rate was evaluated in five grades: ◎, ○, Δ, ×, XX in descending order of evaluation. Δ or more is acceptable.
[0059]
: Success rate 95% or more
○: Success rate 90% or more and less than 95%
Δ: Success rate 80% or more and less than 90%
X: Success rate 60% or more and less than 80%
XX: Success rate less than 60%
[Operability]
The occurrence rate of thread breakage when 1000 kg of crimping was performed was calculated by the number of times per ton, and was evaluated in five stages: ◎, ○, Δ, ×, XX. Δ or more is acceptable.
[0060]
A: The operability is very good. (Thread breakage less than 1.0 times / t)
○: Operability is good. (Thread breakage 1.0 times / t or more and less than 3.0 times / t)
Δ: Operability is normal. (Thread breakage 3.0 times / t or more and less than 6.0 times / t)
X: Operability is poor. (Thread break 6.0 times / t or more and less than 20.0 times / t)
XX: Operability is extremely poor. (Thread break 20.0 times / t or more)
[Comprehensive evaluation]
The suitability as a crimping nozzle was relatively evaluated in five levels, ◎, ○, Δ, ×, and XX. Δ or more is acceptable.
[0068]
  [Example1]
  A nylon 6 chip having a relative viscosity of sulfuric acid of 2.8 was melt-spun with an extruder type spinning machine to obtain a Y-shaped cross-section filament.
  The spun yarn was drawn immediately after cooling and solidification, and was taken out after refueling. The drawn yarn was subsequently stretched, and without subsequent winding, crimping was applied using the fluid treatment nozzle of the present invention in which an adapter similar to that shown in FIG. 5 was connected to the venturi.
  Here, the thread introduction hole diameter of the needle is 1.5 mm, the eccentric amount H of the needle and the venturi is 0.08 mm, the diameter N of the narrowest flange portion of the venturi ejection hole is 2.5 mm,By offsetting the center of the thread passage hole of the adapter with respect to the center of the venturi ejection hole, the area S1 where the venturi ejection hole is blocked is 4.0 mm.² The area S2 of the venturi ejection hole is 19.6 mm ² It was.
  The preheating temperature of the heating roller before the crimping nozzle was 185 ° C., and the heating fluid was heating steam. The pressure of the heated steam was 0.8 MPa and the temperature was 220 ° C.
  The yarn to which crimps were imparted by the crimping nozzle was then taken up by a moving filter described in JP-A-8-284040 and cooled. Subsequently, the yarn was stretched, and then entangled by the entanglement imparting device and finally wound by a winder.
  A crimped yarn having a total fineness of 1170 dtex, 54 holes, a degree of deformation of 3.0, and a crimp elongation of 19.0% was obtained.
[0069]
The degree of false twisting was good (（) with a success rate of 95%. The operability was extremely good (極 め て). The results summarized in Table 1 are shown.
[0070]
  [Example2]
  The total fineness is the same as in Example 1 except that the area S1 of the venturi ejection hole is 7.0 mm 2 by offsetting the center of the thread passage hole of the adapter with respect to the center of the venturi ejection hole. A crimped yarn having 1170 dtex, 54 holes, a degree of deformation of 3.0, and a crimp elongation of 18.5% was obtained.
[0071]
The degree of false twisting was good (（) with a success rate of 95%. The operability was good (◯). The results summarized in Table 1 are shown.
[0074]
  [Example3]
  Example except that it was not picked up by the moving screen but picked up directly by the roller1In the same manner as above, a crimped yarn having a total fineness of 1170 dtex, 54 holes, a degree of deformation of 3.0, and a crimp elongation of 18.0% was obtained.
[0075]
The degree of false twisting was good (（) with a success rate of 95%. The operability was normal (Δ). The results summarized in Table 1 are shown.
[0076]
  [Example4]
  Example except that the discharge amount at spinning is lowered and the fineness of the finally obtained yarn is set to 700 dtex.1In the same manner as above, a crimped yarn having a total fineness of 1170 dtex, 54 holes, a degree of deformation of 3.0, and a crimp elongation of 19.0% was obtained.
[0077]
The degree of false twisting was good (◯) with a success rate of 90%. The operability was good (◯). The results summarized in Table 1 are shown.
[0078]
  [Example5]
  Example except that the discharge amount in spinning is lowered and the fineness of the finally obtained yarn is 400 dtex1In the same manner as above, a crimped yarn having a total fineness of 1170 dtex, 54 holes, a degree of deformation of 3.0, and a crimp elongation of 19.0% was obtained.
[0079]
The degree of false twisting was fairly good (Δ) with a success rate of 85%. The operability was good (◯). The results summarized in Table 1 are shown.
[0080]
As is clear from the results in Table 1, in the examples of the present invention, the false twist level, operability, and crimp level (crimp elongation ratio) were all satisfactory.
[0081]
  [Comparative Examples 1-5]
  In Example 1,The closed area S1 of the venturi ejection hole is 0.0 mm ² AndComparative Example 1 when the diameter of the needle introduction hole of the needle is 0.9 mm, Comparative Example 2 when the eccentric amount H is 0.00 mm, Comparative Example 3 when the eccentric amount H is 0.25 mm, In Comparative Example 3, the discharge amount in spinning is lowered, and the final fineness of the yarn is set to 700 dtex. In Comparative Example 4, the discharge amount in spinning is lowered in Comparative Example 3, and the final Comparative Example 5 was obtained when the fineness of the obtained yarn was 400 dtex.
[0082]
Table 2 summarizes the degree of false twisting, operability, crimp elongation, and the like.
[0083]
  In Comparative Example 1, the diameter of the thread introduction hole of the needleIs smallSince it was too much, the thread | yarn thread | passability of the needle deteriorated and operativity was impossible. In Comparative Example 2, since the amount of eccentricity was too small, the degree of false twisting was good, but the operability was not possible, and the crimp elongation rate was greatly reduced and high crimp was not obtained. there were. In Comparative Example 3, since the amount of eccentricity was too large, false twisting occurred frequently and the degree of false twist was impossible, and at the same time, the operability was lowered although it was within an allowable range. In Comparative Examples 4 and 5, the degree of yarn to be crimped was small, so that the degree of false twist was further deteriorated compared with Comparative Example 3, which was not possible.
[0084]
  Comparative Examples 4 and 54,5By comparing with the above, it is clear that the crimping nozzle of the present invention can be crimped stably to the fineness.
[0085]
[Table 1]

[0086]
[Table 2]

[0087]
【The invention's effect】
According to the present invention, by preventing false twisting of the yarn, the crimped nozzle of the yarn capable of producing a highly crimped and stable quality crimped yarn with good operability to a low fineness, In addition, a method for crimping a yarn using the crimping nozzle can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a crimping nozzle of the present invention in a fluid processing method.
FIG. 2 is a diagram showing an example in which the state of the vent hole of the venturi being blocked by the blocking member is specifically shown.
FIG. 3 is a diagram showing an example of a state in which the vent hole of the venturi is closed by the closing member.
FIG. 4 is a perspective view of an example specifically showing a state in which a member that regulates the yarn width of a yarn is attached to a closing member 18 that closes a part of a venturi ejection hole.
FIG. 5 is a perspective view specifically showing an example of a member, that is, an adapter, in which a member that regulates the yarn width and a closing member are combined.
FIG. 6 is a longitudinal sectional view showing an example of a crimping nozzle of the present invention constructed in a fluid push-in type by connecting yarn accumulation chambers.
FIG. 7 is a perspective view showing an example in which donut-shaped slit plates 26 and spacers 27 are alternately stacked.
[Explanation of symbols]
1: Housing
2: Heated fluid introduction hole
3: Yarn introduction hole
4: Needle
5: Ejection hole
6: Venturi
7: Fluid supply unit
8: Injection nozzle
9: Needle centerline
10: Venturi vent center line
11: Direction to advance the yarn discharged from the crimp nozzle
12: Eccentricity
13: Yarn
14: Moving screen
15: Yarn discharge direction
16: Direction in which heated fluid is discharged
17: Direction of rotation of moving screen
18: Closure member
19: End face part of venturi ejection hole
20: End of the closing member
21: The narrowest part of the venturi vent
22: Member for regulating the yarn width
23: Deposition chamber
24: Fluid suction hole
25: Deposition chamber housing
26: Slit plate
27: Spacer
28: Sedimentation space
29: Deposition chamber exit
30: Shaft bar

Claims (5)

A yarn having a heating fluid introduction hole communicating with the fluid supply unit, a needle having a yarn introduction hole and attached to one end of the housing, and a venturi having an ejection hole and attached to the other end of the housing. A yarn crimping nozzle formed with an introduction hole, a fluid supply portion, and an injection nozzle portion, wherein the diameter of the yarn introduction hole of the needle at the tip on the venturi side is 1 mm or more and 2 mm or less, When the venturi is eccentric and the direction in which the yarn discharged from the crimping nozzle is advanced is defined as the plus direction eccentricity with reference to the center line of the venturi ejection hole, the needle is eccentric in the plus direction, and its eccentricity H (mm) satisfies the following formula (1), with respect to the direction of advancing the yarn discharged from the crimping nozzle, its The end face opposite the venturi jet holes, crimping nozzle of the yarn, characterized in that a closure member for closing a part of the venturi jet holes.
0.02 ≦ H / N ≦ 0.05 (1)
In the formula, N (mm) is the diameter of the narrowest narrow portion of the venturi ejection hole. 2. The crimping process according to claim 1 , wherein an area S1 (mm ² ) of a portion of the vent hole that is blocked by the closing member in the end surface portion of the venturi ejection hole satisfies the following expression (2). nozzle.
0.05 ≦ S1 / S2 ≦ 0.30 (2)
In the formula, S2 (mm ² ) is a cross-sectional area of the ejection hole at the end surface portion of the venturi ejection hole. The crimping nozzle according to claim 1 or 2 , wherein the yarn discharged from the crimping nozzle is regulated by a member that regulates a yarn width. 3. The fluid push-in type is constructed by connecting a yarn accumulation chamber next to the venturi so that the yarn discharged from the venturi ejection hole is pushed and accumulated. No crimping nozzle. The stretched yarn is preheated with a heating roller, then crimped with a crimping nozzle according to any one of claims 1 to 4 , and further stretched on the yarn between a take-up roller and a stretch roller. The yarn is crimped by cooling the yarn with a moving screen provided in front of the take-up roller and immediately after the crimping nozzle when winding with a winder. Method.

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