JP2000256937A - Production of spunlike filament sewing yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spunlike filament sewing yarn enabling to uniformize a distribution of fuzz generated in yarn-yarn self rubbing treatment in the yarn long direction, suppress lowering of the yarn strength, improve dyeing unevenness of the sewn yarn, and further stably and quickly process the spunlike filament sewing yarn. SOLUTION: This sewing yarn is obtained by pull-arranging single or plural yarns of multifilament yarn Y applied with a primary twisting and winding around a guide in going and returning, and fuzz-processing the going yarn and the returning yarn by interlacing with each other and applying twist and squeezing the yarns. In the processing, a pulling ratio DR (%) is made within a range of 1.5-5.5% and satisfying following formula, and further secondary twisting is applied. (17.9/V1/2+0.93)<DR(%)<(17.9/V1/2+3.71) [V is a processing speed (m/min)].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing a spun-like filament suture.

[0002]

2. Description of the Related Art Conventionally, there have been many proposals of attempts to impart the fluff and bulkiness of a spun yarn to a synthetic multifilament yarn, and to apply a fluff to the filament yarn.

[0003] One of the methods is obtained by a method of false twisting or twisting a multifilament yarn while rubbing it with a blade. However, in this method, since the blade is worn over time, it is difficult to remove the yarn in the longitudinal direction of the yarn. There has been a defect that the number of fluffs and the strength of the yarn change over time, and the thread streaks become uneven.

As a method for producing a fluff yarn that solves such non-uniformity, Japanese Patent Laid-Open Publication No. Hei 3-64546 discloses a method of winding a multifilament yarn having a lower twist and an upper twist on a guide and heading toward the guide. A method has been proposed in which the yarns on the outward path and the yarns on the return path are interlaced and both yarns are twisted and ironed to perform fluffing.

[0005] However, the sewing thread obtained by this method can improve the number of fluffs in the longitudinal direction of the thread and the time-dependent change in the thread strength, but cross-processes the multi-filament thread subjected to the lower twist and the upper twist. Therefore, a sufficiently high yarn strength could not be obtained.

[0006] Japanese Patent Laid-Open No. 2-104733 discloses a method of improving the sewability by using a filament-processed yarn in which a filament is subjected to fluid processing to form a loop.
And JP-A-5-106134. However, the sewing thread composed of these filament-processed threads is compared with the span or the mixed thread of the span and the filament,
Although homogeneous, the unwinding property of the wound thread is poor, high-speed sewability is insufficient, and the tailoring appearance is poor. Further, the fluid processing has a disadvantage that the cost is high because a large amount of compressed air is used.

[0007] In order to improve the drawbacks of such conventional fluffed filament processed yarn and fluid processed loop processed thread sewing thread, a fluffing process using a thread-thread self-rubbing process is used.
Applicants have previously disclosed in Japanese Patent Application Laid-Open No. 2-91236 to provide a filament-processed yarn having a spun-like fluff.
JP, JP-A-2-216233, JP-A-3-2
It was proposed in Japanese Patent Application Laid-Open No. 7144, Japanese Patent Application Laid-Open No. 4-91245, and Japanese Patent Application Laid-Open No. 8-337937.

However, in these methods, the processing speed is 50
If it is less than about m / min, the strength can be maintained, but if it is more than 100 m / min, a large amount of frictional heat is generated due to abrasion, and the filament surface is damaged due to brittleness and scraping of the filament, and the strength is reduced. Alternatively, lightening of the abraded portion occurred, and the high productivity was not sufficiently satisfied.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. While maintaining high strength, there is no uneven dyeing and high speed of 100 m / min or more. It is an object of the present invention to provide a method for producing a spun-like filament suture capable of producing the spun-like filament suture at a low cost.

[0010]

According to the present invention, there is provided a method for producing a spun-like filament suture which achieves the above object.
It has the following configuration. That is, (1) one or more multifilament yarns provided with a lower twist are aligned and reciprocally wound around a guide, and the forward yarn and the backward yarn are interlaced with each other to twist and iron. To give a fluff, the tensile rate D
A method for producing a spun-like filament sewing thread, wherein R (%) is in the range of 1.5 to 5.5% and the following formula is satisfied, and the upper thread is further applied. (17.9 / V ^1/2 +0.93) <DR (%) <(1
7.9 / V ^1/2 +3.71) where V: machining speed (m
(2) Processing speed (V) is 100 m / min or more, 1000 m
/ Min or less, the method for producing a spun-like filament suture according to the above (1),

(3) The twist coefficient k of the lower twist is 4000 or more and 12000 or less.
Or the method for producing a spun like filament sewing thread according to (2). However, the lower twist coefficient is given by k = TD1 / ² (T: number of twists per meter, D: fineness).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a description will be given of the structure of a filament-processed yarn having fluff such as spun yarn obtained by the present invention.

The multifilament yarn used in the present invention is not particularly limited, but a thermoplastic synthetic filament such as polyester or nylon is preferably used. Further, it is preferable that the number of multifilaments is large. For example, in the case of a single yarn of 75 denier, 24 or more yarns are preferable. Further, the single yarn denier is preferably thinner, for example, 3 denier or less, and the cross-sectional shape is more octagonal than round, pentagonal than octagonal, triangular rather than pentagonal, and generally larger in shape. Suitable for increasing fluff.

When the multifilament yarn is composed of at least two or more filament groups having different single fiber finenesses, the yarn strength difference or elongation between a single fiber and a non-single fiber is set. A difference may be provided.

FIG. 1 is a schematic view showing an example of a high-sewability filament thread according to the present invention. In the above-mentioned multifilament thread, a filament single thread is randomly cut along a longitudinal direction. As shown in FIG. 1, the yarn surface has fluff.

Here, the fluff is a single filament filament protruding from the surface of the multifilament yarn Y so as to have a yarn end as shown in A and B in FIG.

In the present invention, the multifilament is given a real twist, but the real twist given to the multifilament yarn is restrained inside the yarn by tangling one end of the projecting fuzz. It has the effect of making it state.

As described above, the actual twist restrains the protruding fluff against the yarn, thereby preventing the protruding fluff from coming off the yarn and stabilizing the fluff in a structurally stable state. it can.

When the number of actual twist insertions is increased, the strength of the fluff thread can be further increased. In particular, when the number of lower twist insertions is increased, the fluff foot can be further shortened, and the protrusion can be easily removed. This is preferable because the effect of preventing the occurrence of pilling and pilling can be further improved, and furthermore, the uniformity of the thread streak in the yarn longitudinal direction and the reduction in the strength variation can be achieved.

From the viewpoint that the convergence as a sewing thread is good and sufficient sewability is obtained, if the lower twist number is expressed as a twist coefficient, the lower twist is provided so that the twist coefficient k is 4000 or more. On the other hand, from the viewpoint of preventing the sewing thread from becoming hard and double twisting and reducing the twisting cost, it is preferable that the twisting coefficient k is set so as to be 12000 or less. Here, the twist coefficient k is represented by TD1 / ² (T: number of twists per meter, D: fineness).

Further, in the present invention, the processing speed is 10
In the fuzz processing by self-rubbing treatment of a yarn at a length of 0 m / min or more, the viewpoint of preventing the warp movement in the yarn longitudinal direction, performing uniform rubbing, reducing uneven dyeing, and suppressing the uneven distribution of fluff in the yarn longitudinal direction. From below, the lower twist coefficient k is 7000-1
More preferably, it is in the range of 1,000. Further, the upper twist is preferably 60 to 90% of the number of lower twists in the Z direction. The twisted fluff processed yarn obtained in this manner is subjected to a normal twist setting as required, and then subjected to a normal dyeing finish. Dyeing is generally carried out in a wrapped or cheese form.

The count of the sewing thread obtained by the present invention, that is, the thickness of the sewing thread is not limited. However, for clothing, # 80 (40 denier triplets), # 60 (5
0 denier Miko Yori), # 50 (70 denier Miko Yori) and the like can be used as general-purpose sewing threads. The number of filaments of the original yarn constituting the sewing thread may be appropriately set according to the thickness of the single fiber.

Next, a method for producing a filament sewing thread having a fluff such as a spun yarn having the above-described configuration will be described.

That is, according to the production method of the present invention, one or a plurality of multifilament yarns provided with a lower twist in the lower twisting step are aligned and reciprocally wound around a guide, and the outward yarn and the return yarn. Are twisted and ironed by interlacing them with each other to perform fluffing, the tensile ratio DR is set to 1.
A method for producing a spun-like filament sewing thread in which the upper twist is applied in the upper twist step, wherein the content is within the range given by the following formula. (17.9 / V ^1/2 +0.93) <DR (%) <(1
7.9 / V ^1/2 +3.71) where V: machining speed (m
/ Min), and the processing speed is 100 m / min or more and 10 m / min.
It is preferably at most 00 m / min, and more preferably the twist coefficient k of the lower twist is 4000 or more and 12000 or less. Note that the lower twist coefficient k is k = T · D
^1/2 (T: number of twists per meter, D: fineness).

FIG. 6 shows a manufacturing method according to the present invention.
FIG. 4 is a schematic view showing a range of a tensile rate DR and a processing speed, but in the present invention. When performing the crossing treatment, the tensile ratio DR is set to 1.5
It is very important that the value be within the range given by the above equation, that is, within the range given by the above equation, that is, within the diagonal lines in FIG.

In the present invention, the fluff processing speed is 100 m
In the range of not less than / m and not more than 1000 m / min, the surface of the thread is appropriately shaved and fine irregularities are generated, and at the time of sewing, there is an effect of suppressing an increase in the needle temperature due to friction between the thread and the sewing needle. If the tensile ratio DR is less than 1.5%, fluff is less likely to occur, and if it exceeds 5.5%, yarn breakage occurs, which is not preferable. More preferably, the tensile ratio DR is set to 2.3 to 4.7%.

Further, in the present invention, fluff is generated on the yarn surface, and there is an effect of removing needle heat by the accompanying airflow of the fluff.

As a twisting machine for giving a lower twist in the lower twisting step, a twisting machine called an up twister, a covering machine, an Italian twisting thread, a down twister, a double twister, or the like can be used.

FIG. 2 is an external view showing an example of a yarn-yarn self-rubbing device used in the method for producing a fluff yarn according to the present invention. Y
0 indicates the forward yarn, Y0 'indicates the backward yarn, and P indicates the intersection of the yarns.

As shown in FIG. 2, the fluffing is performed by using the multifilament yarns Ya, Yb, and Yc as guide rollers 3.
In reciprocating winding, the yarn Y0 toward the guide roller 3 and the returning yarn Y0 'are crossed, and at the crossing point P, both yarns Y0 and Y0' are strongly twisted and ironed. A part of the single filament group constituting the yarns Ya, Yb, Yc is shortened to generate fluff.

The multifilament yarns Ya, Yb, and Yc which have generated fluff as described above are fed to the feed roller 4.
From the take-up roller 5 to the cheese 6 (see FIG. 3). This cheese 6 is then hung on an upper-bending machine and subjected to top-bending.

As a twisting machine for giving the upper twist in the upper twisting step, a twisting machine called an up twister, a covering machine, an italian type twisting thread, a down twister, a double twister, or the like can be used.

As shown in FIG. 2, in the fluffing, the yarn itself is rubbed by itself. In the example shown in FIG. 2, the yarn Y0 on the outward path is twisted by about 90 ° by intersecting with the yarn Y0 'on the return path, and the yarn Y0' on the return path is also twisted. Interlacing with Y0 gives a twist of about 90 °. Therefore, when the multifilament yarn passes back and forth at the intersection point P, a total of about 1
An 80 ° twist will be provided.

As shown in FIG. 2, the guide roller 7 or the pin on the supply side of the intersection point P and the guide roller 8 or the pin on the output side are moved in the direction of the arrow so as to cross the yarn path. By adjusting the entrance / exit angle θ between the entrance side and the exit side, the degree of twisting and ironing can be changed, whereby the number of fluffs can be adjusted.

It is preferable that the tension at the time of the rubbing treatment by the crossing be 0.3 g / d or more on both the backward path and the forward path. Also, the twist given by the crossing is
θ is 180 ° or more, preferably 360 ° or more. By giving a twist of θ of 180 ° or more, the rubbing treatment can be performed by contacting the yarn with the mating yarn of half or more around the outer periphery of the yarn.

The twisting direction of the interlacing may be either the S or Z direction, but from the viewpoint of increasing the number of fluffs, it is preferable to intersect while twisting in the same direction as the lower twisting direction. The fluff length can be shortened by inserting a large number of lower twists, and can be lengthened by inserting a small number.

FIG. 3 shows an example of a yarn path diagram in the manufacturing method of the present invention. As shown in FIG. 3, the lower unwound yarn may be unwound in a warp mode, but may be in a warp mode as shown in FIG. 4.

In the manufacturing method of the present invention, the number of pieces to be aligned in the lower twisting step before giving the upper twist may be two or more, but is preferably 2 to 7, and from the viewpoint of achieving a good balance. More preferably, the number is three or seven. The number of lower twists of the multifilament yarns to be aligned may be different from each other, and the lower twist directions may be different from each other.

FIG. 5 is an upper twist process diagram showing an example of the case where a down twister is used. The relationship between the number of upper twists and the number of lower twists is preferably set to the twist direction and the number of twists so as to maintain the balance of the twist torque when the filament processed yarn having a fluff such as the spun yarn of the present invention is used. The twist direction and the upper twist direction are directions opposite to each other, and the number of upper twists is preferably 60 to 90% of the number of lower twists.

[0040]

EXAMPLES Examples 1, 2, 3 In the lower twisting step, a high-strength polyester multifilament yarn having an original yarn of 7.5 g / d (70 denier-
48 filaments, single fiber density 1.46 denier), twist down 900 T / m in S direction, align three, wind around guide roller 5 at yarn running speed 300 m / min. S in the same direction as the lower twist
360 ° in the direction to cross each other to give torsion and ironing, and to perform a fluffing process.
%, 3.03%, and 4.03%. Next, change the top
By applying 597 T / m in the direction, a spun-like filament sewing thread was produced. Table 1 shows the number of fluffs and the strength of the spun-like filament suture. Examples 4, 5, 6 Regarding the relationship between the yarn processing speed and the yarn strength, using the same filament yarn as in Example 1, the number of lower twists was the same, the yarn processing speed was changed to 100 m / min, and fluffing was performed. The tensile ratio DR at that time was set to 2.79%, 3.79%, 4.79%. Next, the upper twist was applied at 597 T / m in the Z direction to produce a spun-like filament sewing thread. Table 2 shows the number of fluffs and the strength of the spun-like filament suture. Examples 7, 8, 9 Regarding the relationship between the yarn processing speed and the yarn strength, using the same filament yarn as in Example 1, the lower twist number was the same, the yarn processing speed was changed to 800 m / min, and the fluff was processed. The tensile ratio DR at that time was 1.63%, 2.63%, and 3.63%. Next, the upper twist was applied at 597 T / m in the Z direction to produce a spun-like filament sewing thread. Table 3 shows the number of fluffs and the strength of the spun-like filament suture. Examples 10, 11, 12 In the lower twisting step, an ultra-high tenacity type polyester multifilament yarn having a raw yarn of 8.5 g / d (70 denier-48 filaments, single fiber density 1.46 denier) was converted into S.
In the direction 900 T / m, the lower twist is performed, and three yarns are aligned and wound around the guide roller 5 at a yarn traveling speed of 300 m / min, and the forward yarn and the backward yarn are in the same direction as the lower twist. 360 ° in the S direction, twisting and ironing are performed by intersecting each other, and fluffing is performed.
%, 3.03%, and 4.03%. Next, change the top
By applying 597 T / m in the direction, a spun-like filament sewing thread was produced. Table 4 shows the number of fluffs and the strength of the spun-like filament suture. Comparative Examples 1,2,3,4 High tenacity type polyester multifilament yarn having 7.5 g / d (70 denier, 48 filament,
A single twist of 1.46 denier) was given a lower twist of 900 T / m in the S direction, and three yarns were aligned and the yarn traveling speed was 15,100,
Wrap around the guide roller 5 at 300,800 m / min,
The forward yarn and the backward yarn are intersected with each other by 360 ° in the S direction in the same direction as the lower twist to give twisting and ironing to fluff, and the tensile ratio DR at that time is 5.2.
0%. Next, the upper twist was applied in the Z direction at 597 T / m to produce a filament-processed yarn. Table 5 shows the number of fluffs and the strength of the filament-processed yarn.

Here, the number of fluff is obtained by measuring the number of fluff having a fluff length of 0.35 mm or more at a yarn traveling speed of 60 m / min using a HAIRINESS COUNTER MODEL DT-104 manufactured by Toray Engineering Co., Ltd.

As described above, by processing within the condition of the tensile ratio DR specified in the present invention as in the embodiment, it is possible to process a spun-like filament thread having good fluff and high strength at high speed and stably. Can be.

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

[0046]

[Table 4]

[0047]

[Table 5]

[0048]

According to the method for producing a spun-like filament suture of the present invention, the distribution of the fluff generated by the self-rubbing treatment of the yarn in the longitudinal direction of the yarn is suppressed, the decrease in the thread strength is suppressed, and the uneven dyeing of the suture is achieved. And furthermore, it is possible to stably process spun-like filament sutures at a high speed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a highly sewable filament thread according to the present invention.

FIG. 2 is a process diagram showing an example of a case where a yarn-yarn self-rubbing device is used in the manufacturing method according to the present invention.

FIG. 3 is a process drawing showing an example in the manufacturing method according to the present invention.

FIG. 4 is a schematic view illustrating an example of a method of unwinding a lower warp yarn by weft removal.

FIG. 5 is a process diagram of the upper twist showing an example when a down twister is used.

FIG. 6 is a schematic diagram showing a range of a tensile rate and a processing speed in the manufacturing method according to the present invention.

[Explanation of Signs] Yk: Spun-like filament sewing thread Y, Ya, Yb, Yc: Multifilament thread with lower twist A, B: Fluff 1a, 1b, 1c: Bobbin 2: Feed roller 3: Guide roller 4 : Feed roller 5: Take-up roller 6: Cheese 7: Guide roller 8: Guide roller 9: Thread-thread rubbing device 10: Peg 11: Tensor 12: Guide 13: Feed roller 14: Bobbin 15: Belt 16: Spindle

Claims (3)

[Claims] (1) A single or plural multifilament yarns provided with a lower twist are aligned and reciprocally wound around a guide, and the outward yarn and the return yarn are interlaced with each other to twist and iron. In applying fluff, the tensile ratio DR (%) is set in a range of 1.5 to 5.5% and within a range satisfying the following expression, and furthermore, an upper twist is applied. A method for producing a spun-like filament sewing thread. (17.9 / V ^1/2 +0.93) <DR (%) <(1
7.9 / V ^1/2 +3.71) where V: machining speed (m
/ Min) 2. The processing speed (V) is not less than 100 m / min.
The method for producing a spun-like filament suture according to claim 1, wherein the speed is not more than 00 m / min. (3) a lower twisting coefficient k of 4000 or more;
The method for producing a spun-like filament suture according to claim 1 or 2, wherein the number is not more than 000. Here, the lower twist coefficient is given by k = T · D ^1/2 (T:
Number of twists per meter, D: fineness).