JPH06184850A - Crimping apparatus for filament yarn - Google Patents

Abstract

PURPOSE:To provide a crimping apparatus capable of continuously producing at a moderate take up tension high-quality crimped filament yarns Y with excellent interlaceability. CONSTITUTION:The crimping apparatus is made up of (A) a nozzle section 4 to jet a hot fluid at a specified tilt angle theta against the axial line for a traveling filament yarn Y, (B) a delivery section 8 for such filament yarn together with hot fluid, (C) a magnified section 9 having a cross-sectional area greater than that of the delivery section 8, and (D) a stuffer section 10 to buckledly stack filament yarns to furnish them with crimps along with discharging hot fluid. The length (L) of the delivery section 8 is set at <20mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a yarn fluid crimping apparatus for injecting a heating fluid such as steam onto a yarn to give the yarn buckling and crimping.

[0002]

2. Description of the Related Art Conventionally, as a crimping device for yarn,
There is known a device for injecting a heating fluid such as steam onto a yarn and pushing the heating fluid into the compression deposition chamber together with the heating fluid to apply crimps.

The basic structure of this conventional device is a nozzle portion for injecting a heating fluid onto a yarn to impart propulsive force and plasticity,
In order to improve the yarn passing property during high-order processing by causing the heated fluid to act on the yarns jetted by the nozzle part, the yarn jetting part for interlacing the single yarns and the interlaced yarns The stuffer part that buckles and crimps the yarn by rapidly decelerating the running speed of the yarn by separating and discharging the heated fluid, and the buckled crimped yarn into a plug-like yarn mass And a compression deposition chamber for successively compressing and depositing.

As such a conventional device, for example, in Japanese Patent Laid-Open No. 57-193530, a yarn speed sufficient to cause the yarn to stall or collide with the yarn mass staying in the compression deposition chamber. In order to obtain the above, there is disclosed a device in which the above-mentioned stuffer portion is formed into a stepwise shape consisting of two steps in front and rear, and a cross-sectional area of the subsequent step portion is narrowed to be smaller than that of the preceding step portion and which is a two-stage orifice of a tapered shape. ing.

Further, in Japanese Patent Laid-Open No. 60-39423, a straight pipe portion having a length of at least 30 mm is provided for the structure of the yarn jetting portion, and an expansion chamber communicating with the straight pipe portion having a rapidly enlarged cross-sectional area. And a device for pushing the fluid flow in the yarn jetting section into the stuffer chamber while gradually compressing the fluid flow.

Further, in Japanese Patent Laid-Open No. 63-288238, the length of the straight pipe portion of the yarn jetting section is set to 20 mm or more in order to rectify the heated fluid and to effectively open the yarn. A formed device is disclosed.

[0007]

However, the above-mentioned Japanese Unexamined Patent Application Publication No.
As shown in FIG. 1 of the conventional device disclosed in Japanese Patent Publication No. 7-193530, the confounding portion has a pre-drawing two-stage orifice, so that the flow velocity of the focusing portion orifice is substantially equal. There was a drawback that the thread tension was determined. That is, the flow rate of the working fluid for increasing the suction tension of the traveling yarn is determined only by the inner diameter (in other words, the cross-sectional area) of the focusing portion orifice, and as a result, the original purpose of the focusing portion orifice. In addition to failing to achieve the convergence of the running yarns, there is a defect that the yarns are clogged at this portion.

Further, in the device disclosed in Japanese Patent Laid-Open No. 60-39423, as shown in FIG. 3, the flow path from the expansion chamber to the pushing chamber is enlarged in the running direction of the yarn. After that, since the structure is narrowed down again, there is the same drawback as that of the above-mentioned Japanese Patent Laid-Open No. 57-193530.

Further, according to the above-mentioned Japanese Patent Laid-Open No. 63-288238, as shown in FIG. 1, since the straight pipe portion length of the yarn jetting portion is 20 mm or more, the working fluid is the yarn. Although the tension applied to the strip becomes large, it has a drawback that the confounding action is diminished.

The present invention has been made in view of the above problems. As a result of intensive studies by the present inventors, in order to continuously produce a crimped yarn of excellent quality, a yarn take-up function is required. Therefore, it has become necessary to provide a crimping device having both the function of entanglement with the yarn and the function of entanglement.

That is, the present invention solves the problems of the above-mentioned conventional apparatus, and enables crimped yarns having good entanglement and excellent quality to be continuously produced with an appropriate take-up tension. An object is to provide a processing device.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a nozzle portion for injecting a heating fluid at a constant inclination angle with respect to the axis of a running yarn, and a downstream portion of the nozzle portion. A yarn jetting section that is connected and jets a yarn together with the heating fluid; an enlarged section that is connected downstream of the yarn jetting section and that has a cross-sectional area larger than the cross-sectional area of the yarn jetting section; A stuffer chamber connected to the downstream side of the enlarged portion and having an exhaust gap for discharging the heating fluid to the outside, and a pile for buckling and depositing the yarn from which the heating fluid has been separated to provide crimp to the yarn. In the apparatus for crimping a yarn including a chamber, the length (L) of the yarn jetting portion from the nozzle portion to the enlarged portion is formed to be 1 mm or more and less than 20 mm.

Here, the inclination angle of the nozzle portion is 5 to 2
0 ° is preferable, and the enlarged portion has an area ratio B / A of 1.1 or more, where A is the area of the yarn jetting portion in the cross section and B is the area of the enlarged portion in the cross section. It is preferably 0 or less.

The shape of the cross section of the yarn jetting section is
It is preferable that the shape of the cross section of the stuffer chamber is a quadrangle and the shape of the cross section is a circle.

The stuffer chamber is composed of a plurality of blades radially arranged with an adjacent interval on the inner diameter of the inlet portion of 0.1 to 1.0 mm, and the inner diameter of the outlet portion is set to the inner diameter of the inlet portion. It is preferable to make it 0.02 mm or more.

A yarn crimping apparatus according to the present invention will be specifically described with reference to the drawings showing an embodiment thereof.

FIG. 1 is a schematic longitudinal sectional view of a yarn crimping apparatus according to the present invention, and FIG. 2 is a schematic right side view thereof.

In the figure, the crimping device of the present invention is a split mold of an upper mold 1 and a lower mold 2. The upper mold 1 and the lower mold 2 are integrally fixed by four bolts 3. ing. Further, the crimping means of the yarn Y described below is applied to the facing surface F of both types.

That is, reference numeral 4 denotes a nozzle portion for injecting a heating fluid onto the yarn Y, and a heating portion provided to face the yarn path 5 for introducing the yarn Y into the apparatus with the yarn path interposed therebetween. It is composed of a fluid supply hole 6 and a pair of jet orifices 7. These parts 5 to 7 communicate with each other on a facing surface of the upper die 1 together with a yarn jetting part 8 and an expanding part 9 which will be described later and are subjected to electric discharge machining. Has been formed. The inlet of the yarn path 5 is chamfered in a curved shape so that the yarn Y can be easily introduced into the crimping device, and is formed into a gently tapered shape in the direction P where the heating fluid joins. ing. Further, the axis of each jet orifice 7 has an inclination angle θ of 5 to the axis of the yarn path 5.
The angle is 20 degrees, preferably 5 to 13 degrees.

The yarn jetting section 8 imparts entanglement between the plurality of single yarns forming the yarn Y by the action of the heating fluid, with respect to the yarns jetted together with the heating fluid from the nozzle section 4. The cross-sectional shape is a quadrangle such as a square or a rectangle, and the area up to the enlarged portion 9 is surrounded by mutually parallel surfaces. The length of the yarn jetting section 8,
That is, the flow path length L of the straight line portion from the intersection Q of the yarn jetting portion 8 and the jetting orifice 7 to the enlarged portion 9 is 1 mm or more in order to impart appropriate take-up tension and entanglement property to the yarn Y. It should be less than 20 mm. If the length L is less than 1 mm or 20 mm or more, the static pressure in the flow path increases and the take-up tension decreases, resulting in a sufficient yarn Y.
This is because the take-up tension cannot be obtained. The shape of the cross section of the yarn jetting section 8 is made into a quadrangle because the yarn is not given a rotational movement as a whole, that is, a yarn such as a godet roll (not shown) provided near the yarn path 5 and above the device. This is because the twist does not reach the upstream device of the yarn.

The enlarged portion 9 is a portion for causing the yarn to be opened and entangled in this flow passage, and the cross-sectional area of this flow passage is the cross-sectional area of the yarn jetting portion 8 on the upstream side. It is a channel that is larger than the area. As a specific example of the expansion, abrupt expansion as shown in the figure is typical, but expansion is also included in the expansion part at a moderate angle with respect to the running direction of the yarn. The cross-sectional shape of the enlarged portion 9 is preferably a quadrangle such as a square or a rectangle, but may be a semicircle. The cross-sectional area A of the yarn jetting section 8 in the cross section and the cross-sectional area B of the enlarged section 9 in the cross section give the running yarn Y entanglement and entanglement, and effectively develop crimping. Preferably has an area ratio B / A of 1.1 to 2.0, and more preferably 1.2 to 1.6. If this area ratio B / A is less than 1.1, the take-up tension will decrease, and if it exceeds 2.0, the take-up tension will not decrease, but the entanglement will decrease and the yarn passing property in higher-order processing will decrease. There was a drawback that it deteriorated.

Numeral 10 buckles the yarn Y by rapidly reducing the inflow speed of the yarn Y by exhausting the heating fluid flowing from the nozzle portion 4 together with the yarn Y to the outside of the apparatus through the exhaust hole 1a. , A stuffer portion for applying crimps, and is composed of a plurality of blades 11, an upper flange 12 and a lower flange 13 for fixing the blades at the upper and lower portions, and these members are mutually laser spots. It is integrated by welding. As shown in FIG. 3, a plurality of blades 11 are radially arranged so as to form a stuffer chamber 11a having a substantially circular cross section in a direction perpendicular to the yarn path axis. The staffer room 11a has an entrance (see FIG. 1).
(Upper part of), the adjacent spacing S on the inner diameter is 0.1 to 1.0.
The upper and lower flanges 12 and 13 are welded so that the inner diameter of the outlet portion (lower portion in FIG. 1) is 0.02 mm or more larger than the inner diameter of the inlet portion.

Reference numeral 14 denotes a deposition control unit for accumulating the yarns Y flowing from the stuffer unit 10 one after another to form a plug-shaped yarn mass, and a block 15 is a deposition chamber having a cylindrical cavity. 16 are formed.

Among the members described above, the nozzle portion 4, the yarn jetting portion 8 and the enlarged portion 9 are formed by electric discharge machining only on the facing surface F of the upper die 1, and the stuffer portion 10 is provided.
The semi-cylindrical recesses 10a and 14a are formed on the facing surfaces F of the molds 1 and 2, respectively, and the deposition control unit 14 is housed in a hollow space having a cylindrical shape by joining the molds. On the other hand, the nozzle part of the lower mold 2 is simply a flat surface in order to avoid a shape mismatch with the lower mold nozzle part 4, and only the stuffer part 10 and the deposition control part 14 have the semi-cylindrical recess 10a. , 14a are formed. As shown in FIG. 4, the nozzle part 4 does not have the nozzle part 4 directly formed on the upper mold 1, but only the nozzle part 4 is formed on another plate 4a, and the facing surface F is a flat upper mold. You may interpose between 1 and the lower mold 2, and may be pinched | interposed. Such an embodiment has an advantage that the nozzle portion 4 can be processed with high accuracy.

In the above-described yarn crimping apparatus of the present invention, as the yarn Y, polyester filament, polyamide filament or the like can be used, and as the heating fluid, heated air, steam, superheated steam or the like can be used. Can be used.

[0026]

When the heating fluid is jetted from the supply hole 6 through the orifice 7 to the yarn Y at a constant angle θ with respect to the yarn Y entering the device from the yarn path 5, the yarn Y and the heating fluid are separated from each other. Confluence point P
Join at. Here, the heating fluid jetted from the orifices 7 on both sides of the yarn Y at a jet angle θ gives a propulsive force to the yarn, that is, an appropriate take-up tension to the yarn Y, It enables smooth and continuous uptake into the equipment. At this time, since the length L of the yarn jetting unit 8 is 1 mm or more and less than 20 mm,
While maintaining an appropriate take-up tension, a strong entanglement is provided between the single yarns. Since the cross-sectional area of the enlarged portion 9 following the yarn jetting portion 8 is drastically enlarged as compared with the yarn jetting portion 8, the fluid resistance in the flow path does not increase, and further As the fluid velocity increases in this channel, the fluid force acts on the yarn, and the take-up tension for the yarn Y further increases. Further, since the fiber-spreading effect by expansion is effectively imparted to the yarn at the enlarged portion, a proper entanglement is imparted.

The yarn Y and the heating fluid together with the upper flange 12
When flowing into the stuffer chamber 11a through the above, the heating fluid is discharged from the plurality of gaps between the blades 11 through the exhaust holes 1a to the outside of the apparatus. On the other hand, in the yarn Y, the heated fluid is separated from the outside of the device, so that the inflow speed is rapidly reduced, and the yarn Y is downwardly moved by the subsequent yarn Y and the pushing force of the heated fluid which are sequentially supplied from the upper portion. It is pushed in sequentially and buckles and crimps are applied. The plug-shaped yarn masses accumulated in the deposition chamber 16 in this manner are successively discharged from the lower side to the outside of the apparatus and supplied to the next step (not shown).

[0028]

EXAMPLES Example 1 In the example apparatus shown in FIGS.
Of the injection orifice 7 has an inner width of 0.6 mm and a depth of 1.
The injection angle θ was 9 mm and the angle was 10 degrees. In addition, the yarn jetting unit 8
Has a length L of 2.5 mm and a rectangular cross section, and the enlarged portion 9 has an inner width of 3 mm and a depth of 1.9 mm.
Of rectangular shape. Further, the stuffer unit 10 has an inner diameter of the inlet portion of the stuffer chamber 11a of 6.5 mm and the adjacent space S is 0.19 mm, and the deposition unit 14 has an inner diameter of the deposition chamber 16 of 7.5 mm and is fluid crimped. Configured the device.

Then, 1050 denier nylon filament 54 yarn is supplied to this apparatus from the yarn path 5, and the pressure from the injection orifice 7 is 8 kg / cm ² . G 2 water vapor (240 ° C.) was supplied, and the take-up tension and the entanglement property with respect to the yarn Y were measured at a plurality of positions in each flow path described below. As for the measuring method, regarding the take-up tension, a tension measuring device manufactured by Kanai Machinery Co., Ltd. (model: CM-500ST
R). As for the entanglement property, 50 lengths (cm) of the fiber opening portion were measured, and the average length was 10
I turned over at 0 cm.

These results will be described with reference to FIGS. 5 and 6.

FIG. 5 shows the flow path from the nozzle section 4 to the enlarged section 9 in the apparatus of FIG. 1, and the symbols A to E in the figure show the main measurement points. In FIG. 6, the horizontal axis shows a distance of 60 mm from the yarn path 5 including the main measurement points to the end point of the enlarged portion 9, and the vertical axis shows the take-up tension at each measurement point and the static pressure which is a judgment index of the confounding property. It is a distance-static pressure curve figure.

As shown in FIG. 5, when the opening end of the jet orifice 7 to the yarn jetting portion 8 is point B, the intersection point Q is point C, and the end point of the yarn jetting portion 8 is point D, a distance between C and D is obtained. Is the flow path length L of the yarn jetting unit 8, which is 2.5 mm in this embodiment. When the end point of the enlarged portion 9 is point E, the flow path length of the enlarged portion 9 is between D and E, which is 30 mm in this embodiment. In such a flow path structure, as shown in FIG.
From the point A of the inlet to the point B of the opening of the yarn jetting portion 8, the static pressure changes at about 0 Pa, but the static pressure slightly increases from the point B to the point C of the starting point of the yarn jetting portion 8. Then, in the flow path of the yarn jetting unit 8, that is, between C and D, the static pressure sharply decreases,
The end point D of the yarn jetting unit 8 is the lowest point of the negative pressure. Then, after that, the static pressure is gradually recovered, and after reaching approximately 0 Pa near the middle of the enlarged portion, the pressure changes to positive pressure and reaches the end point E of the enlarged portion 9.

In the flow path having such a static pressure characteristic, the take-up tension is increased between the yarn Y and the yarn injection section 8 between C and D due to the sudden decrease in the static pressure, which increases the suction force. ,
On the contrary, between C and E of the enlarged portion 9, the static pressure increases, so that the degree of freedom in the movement of the yarn increases and entanglement occurs. Therefore,
The yarn is given a preferable take-up tension and entanglement.

[0034]

COMPARATIVE EXAMPLE Comparative Example 1 On the other hand, as shown in FIG. 7, there is no expanded portion 9 in the flow path of the crimping device, and a straight yarn winding in which the length L of the yarn injection portion 8 is 25 mm. A reduction processing device was prototyped, and the first embodiment described above
FIG. 8 shows a static pressure-distance curve drawn under the same crimping and measurement conditions as in.

In FIG. 8, the static pressure rises positively between the point B at the inlet of the yarn jetting section 8 and CD in the middle thereof, and the yarn Y traveling in the yarn jetting section 8 is There was no problem in entanglement, but the pulling tension was inferior.

COMPARATIVE EXAMPLE 2 Contrary to this, as shown in FIG. 9, in the case where the yarn jetting portion 8 of the crimping device is absent and the expanding portion 9 is a divergent (taper-like) flow path. FIG. 10 shows a static pressure-distance curve. The crimping process and measurement conditions in this case are the same as those in the first embodiment.

In FIG. 10, the static pressure rises near the confluence point P, almost in the same manner as the static pressure-distance curve of FIG. The static pressure increased again through the lowest point E of the pressure, but did not return to the positive pressure.

Since the yarn thus obtained had almost no entanglement, the yarn passing property in the high-order processing was poor and the quality was poor.

The crimping conditions such as static pressure, pressure loss, fluid (steam) flow velocity in the flow path near the yarn jetting section 8 in Example 1 and Comparative Examples 1 and 2 described above, and the yarn When the relationships of the acting pulling tension, the confounding effect, and the like are summarized, it has been found that the tendency as shown in Table 1 below is exhibited.

[0040]

[Table 1] From Table 1, as in Example 1, in order to obtain excellent performance as a yarn crimping device, it is necessary to provide a static pressure difference in the yarn advancing direction in the flow path near the yarn jetting unit 8. Becomes That is, it is found that there is a condition that a portion where the static pressure is negative for obtaining a high take-up tension and a portion where the static pressure is positive for giving a proper entanglement are formed downstream thereof.

In consideration of the above results, the length L of the yarn jetting section 8 was specifically changed to evaluate the take-up tension with respect to the yarn Y and the entanglement of the obtained yarn. , As shown in Table 2 below. In addition, Examples 2-5 and Comparative Example 3
The crimping conditions of ~ 6, the take-up tension, and the measurement conditions of the entanglement property are the same as in the case of Example 1.

[0042]

[Table 2] Evaluation criteria: ○ …… Take-off tension 45g or more, entanglement 5 / m or more △ …… Take-off tension 40g or more, entanglement 3 / m or more × …… Take-off tension less than 40g, entanglement 3 / m or less This table As is clear from 2, the length of the yarn jetting section 8 is 1
In Examples 1 to 5 having a size of not less than 20 mm and less than 20 mm, the result was that the take-up tension at the yarn jetting portion 8 was large and the entanglement with the obtained yarn Y was excellent, whereas the yarn jetting was performed. Comparative Example 2 in which the length of the portion 8 is less than 1 mm and 20 mm or more
It can be seen that in Nos. 3 and 4 to 6, the pressure loss in the yarn jetting unit 8 and the expanding unit 9 increases (static pressure increases), and the take-up tension decreases.
Further, as shown in Comparative Example 1, in the case where the injection portion 8 is absent and the enlarged portion 9 has a divergent flow path, there is no place where the static pressure positively changes because the pressure loss is extremely small, and therefore there is no problem with the take-up tension. However, no confounding is possible.

Next, in the crimping apparatus of Example 1, when the area of the yarn jetting section 8 in the cross section is A and the area of the enlarged section in the cross section is B, the respective cross-sectional areas are shown. The device with various changes was made for trial production, and the cross-sectional area ratio B / A
Table 3 below summarizes the effects on the take-up tension and confounding properties of
Is. The crimped yarn processing conditions, measurement and evaluation conditions were exactly the same as in Example 1.

[0044]

[Table 3] From Table 3, it can be seen that in the case of Example 1 above, when the cross-sectional area ratio B / A is 1.1 or more and 2.0 or less, the take-up tension and the entanglement property are further improved.

[0045]

As described above, the apparatus for crimping a yarn according to the present invention has a nozzle portion for injecting a heating fluid at a constant inclination angle with respect to the axis of the traveling yarn, and the nozzle portion. A yarn jetting section that is connected downstream of the yarn jetting section and jets the yarn together with the heating fluid, and an enlarged section that is connected downstream of the yarn jetting section and that has a cross-sectional area larger than the cross-sectional area of the yarn jetting section. When,
A stuffer chamber connected to a downstream side of the enlarged portion and having an exhaust gap for discharging the heating fluid to the outside, and a yarn in which the heating fluid is separated are buckled and accumulated to provide a crimp to the yarn. In a yarn crimping device including a deposition chamber, since the length (L) of the yarn injection part from the nozzle part to the enlarged part is formed to be 1 mm or more and less than 20 mm, the device is run in the device. On the yarn, an appropriate take-up tension and a entanglement action that effectively entangles a plurality of single yarns with each other,
It is possible to continuously produce crimped yarns of excellent quality.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a yarn crimping apparatus according to the present invention.

2 is a schematic right side view of the device of FIG. 1. FIG.

FIG. 3 is a cross-sectional view of the stuffer section 10 of FIG.

4 is a perspective view showing a different embodiment of the nozzle portion 4 of the apparatus of FIG.

5 is a schematic view of a nozzle unit 4 of the apparatus shown in FIG.

6 is a distance-static pressure curve diagram in the case of using the nozzle portion of FIG.

FIG. 7 is a schematic diagram showing a comparative example when the nozzle portion of FIG. 5 is long.

8 is a distance-static pressure curve diagram when the nozzle portion of FIG. 7 is used.

FIG. 9 is a schematic diagram showing a comparative example when the nozzle portion in FIG. 5 is short.

FIG. 10 is a distance-static pressure curve diagram in the case of using the nozzle portion of FIG.

[Explanation of symbols]

 1: Upper mold 2: Lower mold 3: Bolt 4: Nozzle part 8: Yarn injection part 9: Enlarged part 10: Stuffer part 11: Blade 11a: Stuffer room 14: Deposition part 16: Deposition room L: Yarn Jet length Y: Yarn θ: Inclination angle

Claims (6)

[Claims] 1. A nozzle unit for injecting a heating fluid at a constant inclination angle with respect to an axis of a running yarn, and a yarn ejecting unit connected downstream of the nozzle unit for ejecting a yarn together with the heating fluid. And an enlarged portion connected downstream of the yarn jetting portion and having a cross-sectional area larger than that of the yarn jetting portion, and connected downstream of the enlarged portion to discharge the heating fluid to the outside. A yarn crimping device comprising: a stuffer chamber having an exhaust gap; and a deposition chamber for buckling and depositing the yarn separated from the heating fluid to apply crimp to the yarn, A crimping device for a yarn, wherein the length (L) of the yarn jetting portion from the nozzle portion to the enlarged portion is formed to be 1 mm or more and less than 20 mm. 2. The yarn crimping device according to claim 1, wherein the inclination angle is 5 to 20 °. 3. The expanded area has a cross-sectional area ratio B / A of 1.1 or more, where A is the area of the yarn injection section in the cross section and B is the area of the expanded section in the cross section. It is 0 or less, The crimping apparatus of the yarn of Claim 1 characterized by the above-mentioned. 4. The yarn crimping device according to any one of claims 1 to 3, wherein a cross-sectional shape of the yarn jetting section is a quadrangle. 5. The yarn crimping device according to claim 1, wherein the cross section of the stuffer chamber has a circular shape. 6. The stuffer chamber is composed of a plurality of blades radially arranged with an adjacent interval on the inner diameter of the inlet portion of 0.1 to 1.0 mm, and the inner diameter of the outlet portion is set to the inner diameter of the inlet portion. The crimping device for a yarn according to claim 5, wherein the crimping device is made larger by 0.02 mm or more.