JPH08269835A - Yarn crimping apparatus - Google Patents

Abstract

PURPOSE: To provide an yarn crimping apparatus capable of suppressing a swirl flow in a yard introducing hole, effectively preventing false twist of yarn and producing crimped yarn having stable qualities without causing end breakage and crimping unevenness. CONSTITUTION: In this yarn crimping apparatus comprises a housing 1 which is in a hollow state and has a heated fluid introducing hole 2 communicating with a hollow part at the side part, a needle 4 which has a yarn introducing hole 3 and is attached to one end of the housing 1 and a Venturi tube 6 which has a jetting hole 5 and is attached to the other end of the housing in which a fluid supplying chamber 7 communicating with the yarn introducing hole 2 and the Jetting hole 5 and a jetting nozzle part 8 are made in a space formed by the housing 1, the needle 4 and the Venturi tube 3 at least a part of the yarn introducing hole of the needle 4 is made into a modified cross-sectional shape or at least a part of the yarn introducing hole is provided with a projected part 9 to control a swirl flow of the heated fluid in the yarn introducing hole 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimping device for crimping a thermoplastic synthetic fiber yarn, and more specifically to prevent false twisting of the yarn and to cause yarn breakage or crimp unevenness. The present invention relates to a crimping device for a yarn capable of producing a crimped yarn having stable quality.

[0002]

2. Description of the Related Art As a method of crimping a thermoplastic synthetic fiber yarn, a heating fluid jet nozzle is used to crimp the yarn with a high-temperature heating fluid such as steam or heated air. , Known from the past.

As a conventional crimping device for a yarn, for example, JP-A-54-96144, JP-A-55-137239 and JP-A-57-1.
Nos. 83431 and the like are known, all of which are hollow and have a heating fluid introducing hole in a side portion which communicates with the hollow portion, and a housing having a yarn introducing hole and one end of the housing. And a venturi having an ejection hole and attached to the other end of the housing. The space formed by the housing, the needle and the venturi communicates with the yarn introducing hole and the ejection hole. A fluid supply chamber and an injection nozzle section that are wound around the fluid supply chamber, pass through the injection hole from the injection nozzle, and are discharged to the lower portion while being crimped to the yarn. There is.

However, in the conventional crimping apparatus having such a structure, the yarn introducing hole has a circular cross-sectional shape, which causes the following problems.

That is, it is difficult to completely align the center of the heating fluid introduction hole attached to the side of the housing with the center of the fluid supply chamber composed of the needle and the housing.
The heating fluid will be slightly eccentrically supplied.

Also, depending on the state of the flow of the heating fluid supplied to the heating fluid supply chamber and the finishing state of the needle,
A swirl flow will occur in the flow of the heating fluid in the deposition chamber,
The swirling flow affects the heating fluid that passes through the jet nozzle and the jet holes that are formed by the needle and the venturi, and the heating fluid that is discharged from the venturi to the deposition chamber, and is discharged downward while swirling. When this swirling flow becomes large, the swirling force also acts on the yarn passing through the yarn introducing hole of the needle.

When the yarn supplied in this way turns,
A yarn located above the yarn introduction hole due to false twist on the yarn passing through the yarn introduction hole of the needle as well as crimp unevenness caused by adversely affecting the crimp loop formed by the heating fluid. The false twist will spread to the strip, especially false twist occurs even with a slight turning force,
The response was extremely difficult.

Moreover, in general, when crimping is applied to a yarn, the yarn is preheated by a heating roll and then supplied to the crimping device, so that the yarn is introduced into the yarn introducing hole of the needle. If a large false twist occurs on the heating roll, the yarn slides on the heating roll and becomes entangled with other yarns, resulting in yarn breakage, or the yarn width changes on the heating roll. There was a problem that the effect was uneven and crimp unevenness was caused.

Therefore, the crimped yarn manufactured by using the conventional crimping device needs to undergo a rigorous crimping test after the production, and only the accepted product which is free from yarn breakage and crimping unevenness is There was the annoyance that it had to be applied to the intended use.

[0010]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying how to solve the above-mentioned problems in the prior art.

Therefore, an object of the present invention is to produce a crimped yarn of stable quality by eliminating false twisting of the yarn even if a turning force is generated, eliminating the occurrence of yarn breakage and crimp unevenness. An object of the present invention is to provide a crimping device for a yarn.

[0012]

In order to achieve the above object, a yarn crimping device of the present invention comprises a housing having a hollow shape and a heating fluid introducing hole communicating with the hollow portion at a side portion thereof. A needle having a yarn introduction hole and attached to one end of the housing, and a venturi having an ejection hole attached to the other end of the housing, and forming a space formed by the housing, the needle and the venturi, In a yarn crimping device having a fluid supply chamber communicating with a yarn introducing hole and a jetting hole and an injection nozzle portion, at least a part of the yarn introducing hole of the needle is configured to have an irregular cross-sectional shape. And

Further, the apparatus for crimping a yarn according to the present invention is
A housing that is hollow and has a heating fluid introduction hole that communicates with the hollow portion on the side, a needle that has a yarn introduction hole and is attached to one end of the housing, and a jet nozzle that is attached to the other end of the housing And a cavity formed by the housing, the needle, and the venturi, wherein the void is formed by the housing, the needle, and the venturi, and is a fluid supply chamber communicating with the yarn introduction hole and an ejection nozzle, and an injection nozzle portion. The protrusion is provided on at least a part of the inner wall surface of the yarn introducing hole.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a yarn crimping device of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a first embodiment of a crimping machine according to the present invention, and FIG. 1 (a) is a longitudinal sectional view,
FIG. 1B is a sectional view taken along the line AA of FIG.
2A to 2F are cross-sectional views showing other aspects of the yarn introducing hole.

Referring to FIG. 1, the yarn crimping device of the present invention has a housing 1 which is hollow and has a heating fluid introduction hole 2 in its side portion which communicates with the hollow portion, and a yarn introduction hole 3. The needle 4 is attached to one end of the housing 1, and a venturi 6 having an ejection hole 5 is attached to the other end of the housing 1.

A fluid supply chamber 7 is formed in the gap between the housing 1 and the needle 4, and an injection nozzle 8 is formed in the gap between the lower end of the needle 4 and the venturi 6 to supply the yarn. The mouth 3 is connected to the ejection hole 5 via the ejection nozzle portion 7.

Therefore, the yarn Y supplied from the yarn supply port 3 is mainly ejected by the heating fluid sent from the heating fluid introduction port 2 to the ejection hole 5 through the fluid supply chamber 7 and the ejection nozzle portion 7. The portion 8 receives a strong jet, and the single yarns are entangled to form crimped yarns, which are discharged from the jet holes 5 together with the heating fluid.

By the way, in the conventional crimping machine, the yarn supply port 3 has a substantially circular cross section.
As described above, it is difficult to completely align the center of the fluid supply chamber 7 composed of the needle 4 and the housing 1, and the heating fluid is eccentrically supplied, so that a swirling flow is generated in this portion, and this swirling flow occurs. The yarn Y whose flow is located at the yarn supply port 3
False twisting was applied to the fiber, resulting in defects such as yarn breakage and crimp unevenness.

Therefore, in this embodiment, the cross-sectional shape of the yarn introducing hole 2 is made to have an irregular cross-sectional shape (square cross section in the drawing) over the entire length, and the swirling flow of the heating fluid in the yarn introducing hole 2 is weakened. Therefore, the occurrence of false twist is prevented.

Here, the irregular cross-sectional shape means a shape other than a circular cross-section and does not indicate only a part, but also includes, for example, a spiral groove provided in the running direction of the yarn.

FIG. 2 shows the shape of this modified cross section.
And (a) triangular cross section, (b) quadrangular cross section, (c) hexagonal cross section, (e) rectangular cross section, (e) star cross section and (f) polygonal cross section.

As described above, when the yarn introducing hole 3 has a modified cross section in order to suppress the turning force of the yarn Y, the more the cross-sectional shape is complicated and the unevenness is, the higher the effect of suppressing the turning force of the yarn Y is. However, if the resistance when the yarn Y passes through the yarn introducing hole 2 is too large, smooth yarn feeding cannot be performed, and problems such as yarn breakage occur, so the thickness of the yarn Y and the yarn feeding In consideration of speed and the like, the optimum cross-sectional shape, the length of the deformed portion, and the like will be determined in consideration of ease of manufacturing. Considering the above-mentioned various problems, the triangular cross section and the rectangular cross section are preferably adopted.

By setting the manufacturing tolerance in the manufacturing process of the crimping machine, it is possible to sufficiently suppress the generation of a large turning force. Therefore, regarding the generation of a small turning flow that gives false twist to the yarn, the yarn is introduced. It can be completely suppressed only by improving the sectional shape of the hole 2.

Next, the second embodiment shown in FIG. 3 is different from the above-mentioned first embodiment in that a part of the yarn introducing hole 3 has a modified cross section.

That is, FIG. 3 is an explanatory view of a needle in a second embodiment of the yarn crimping device of the present invention, FIG. 3 (a) is a longitudinal sectional view, and FIG. 3 (b) is FIG. a) BB
FIG.

In the second embodiment shown in FIG. 3, the needle 4
In the yarn introducing hole 3 of No. 3, the yarn guide portion 3a has a circular cross section, but only the nozzle portion 3b on the tip side is formed in a triangular irregular cross section. Similar to the example, the swirling flow of the heating fluid in the yarn introducing port 3 is weakened, and false twist can be prevented from occurring.

When the yarn introducing hole 3 has a modified cross section as in the first and second embodiments,
The smaller the cross-sectional area S of the modified cross-sectional shape portion of the yarn introducing hole 3, the stronger the false twist suppressing force, but conversely, if it is too small, the resistance when the yarn passes increases, so the denier of the yarn Y is changed. If the cross-sectional area S and the denier D are 2
It is preferable that 000 ≧ D / S ≧ 200.

Next, in the third embodiment shown in FIG. 4, instead of making the yarn introducing hole 3 have a modified cross section, a protrusion 9 is formed on at least a part of the inner wall surface of the yarn introducing hole 3 of the needle 4. It is different from the above-described first and second embodiments in that the swirling flow in the yarn introducing hole 3 is suppressed by the provision thereof.

That is, FIG. 4 is an explanatory view of a needle in the third embodiment of the yarn crimping apparatus of the present invention, FIG. 4 (a) is a longitudinal sectional view, and FIG. 4 (b) is FIG. 3 ( a) C-C
FIG.

In the third embodiment shown in FIG. 4, the needle 4
By inserting and fixing a plurality of protrusion members 9 from the side surface of the yarn introduction hole 3 and a plurality of protrusions 9'provided on the inner wall of the yarn introducing hole 3, the heating fluid in the yarn introducing hole 3 can also be formed by such a configuration. It is possible to suppress the swirling flow and prevent the occurrence of false twist.

Further, the fourth embodiment shown in FIG. 5 is the crimping apparatus shown in the above-mentioned first to third embodiments, in which a yarn accumulating chamber 10 is provided so as to be connected to the venturi 6 and the fluid is pushed in. An embodiment in which the crimp stability is further enhanced by the constitution of the formula is shown.

That is, FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the yarn crimping apparatus of the present invention, and reference numerals 1 to 8 are the same as those described in the above first to third embodiments. Is.

In the fourth embodiment, the thread introduction hole 3 is formed with a modified cross-sectional shape portion and / or a projection portion 9. Further, below the venturi 9, a heating fluid discharge hole 11 and a plurality of fluid discharge holes 11 are formed. The deposition chamber 10 having the ring plate 12 is arranged in communication with each other, and the crimped yarns are continuously compressed and accumulated as a plug-shaped yarn mass.

[0035]

As described above, according to the apparatus for crimping a yarn of the present invention, a part or all of the yarn introducing hole of the needle is deformed or a protrusion is formed inside the yarn introducing hole. Since the portion is provided, the swirling flow in the yarn introducing hole is suppressed,
It is possible to effectively prevent false twisting of a yarn, and it is possible to produce a crimped yarn of stable quality without causing yarn breakage or crimp unevenness.

[Brief description of drawings]

1 is an explanatory view showing a first embodiment of a crimping device according to the present invention, FIG. 1 (a) is a longitudinal sectional view, FIG.
FIG. 1B is a sectional view taken along the line AA of FIG.

2 (a) to 2 (f) are cross-sectional views showing another embodiment of the yarn introducing hole.

3 is an explanatory view of a needle in a second embodiment of the yarn crimping device of the present invention, FIG. 3 (a) is a longitudinal sectional view, and FIG. 3 (b) is FIG. 3 (a). ) Is a cross-sectional view taken along the line BB of FIG.

4 is an explanatory view of a needle in a third embodiment of the yarn crimping device of the present invention, FIG. 4 (a) is a longitudinal sectional view, and FIG. 4 (b) is FIG. 3 (a). ) Is a cross-sectional view taken along line CC of FIG.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the yarn crimping device of the present invention.

[Explanation of symbols]

 Y thread 1 housing 2 heating fluid introducing hole 3 thread introducing hole 3a thread guiding part 3b nozzle part 4 needle 5 jetting hole 6 venturi 7 fluid supply chamber 8 jetting nozzle part 9 projecting member 9'projecting part 10 thread depositing part 11 Heating fluid discharge hole 12 Ring plate

Claims (6)

[Claims] 1. A housing which is hollow and has a heating fluid introduction hole which communicates with the hollow portion at a side thereof, a needle which has a yarn introduction hole and which is attached to one end of the housing, and an ejection hole. And a venturi attached to the other end of the yarn, and a void formed by the housing, the needle and the venturi is used as a fluid supply chamber and an injection nozzle portion communicating with the yarn introduction hole and the ejection hole, and crimping the yarn. An apparatus for crimping a yarn, wherein at least a part of the yarn introducing hole of the needle is formed into an irregular cross section. 2. The yarn crimping device according to claim 1, wherein at least a part of the yarn introducing hole has a triangular cross-sectional shape. 3. The yarn crimping device according to claim 1, wherein at least a part of the yarn introducing hole has a rectangular cross-sectional shape. 4. A relation of 2000 ≦ D / S ≦ 200 is satisfied, where S is the cross-sectional area of the modified cross-section of the yarn introducing hole and D is the denier of the yarn to be crimped. The crimping device for a yarn according to claim 1, 2 or 3. 5. A housing which is hollow and has a heating fluid introducing hole which communicates with the hollow portion at a side portion, a needle which has a yarn introducing hole and is attached to one end of the housing, and an ejection hole. And a venturi attached to the other end of the yarn, and a void formed by the housing, the needle and the venturi is used as a fluid supply chamber and an injection nozzle portion communicating with the yarn introduction hole and the ejection hole, and crimping the yarn. An apparatus for crimping a yarn, wherein a protrusion is provided on at least a part of an inner wall surface of the yarn introducing hole of the needle. 6. The yarn crimping device according to claim 1, wherein the yarn accumulation chamber is provided so as to be connected to the Venturi, and the device is of a fluid pushing type. .