JP2877817B2 - Method for producing bulky franc yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is a bulky processed yarn having loops and slacks, and is structurally stable, and imparts a soft feeling of volume and a novel surface change to a fabric. The present invention relates to a method for producing the obtained bulky franc yarn.

(Prior Art) Conventionally, it is known that a multifilament yarn is subjected to an intermittent false twisting operation to produce a yarn having S twisted portions and Z twisted portions alternately in the longitudinal direction of the yarn. The resulting yarn has the disadvantage that the change in appearance is monotonous.

In recent years, with the diversification of consumer preferences, attempts have been made to produce a processed yarn that can obtain a fabric with a changing appearance and a soft feel of volume by combining intermittent false twisting operations and other processes. It has been done.

For example, Japanese Patent Application Laid-Open No. Sho 61-266629 discloses a method in which a yarn is intermittently false-twisted and then subjected to fluid treatment while oversupplying. However, in this method,
Since the multifilament yarn is subjected to fluid treatment in an oversupply state, it becomes a large yarn of an overroll loop. When the surfaces of the fabric using the processed yarn are overlapped,
There is a disadvantage that a so-called fastener phenomenon occurs in which the overroll loop becomes entangled and hardly peels off. Also, this fabric had a hard, unique so-called Hershey feel, which is characteristic of raw yarn, and was far from a soft, voluminous feel.

On the other hand, Japanese Patent Laying-Open No. 58-149338 proposes a method of performing an intermittent false twisting operation on a multifilament yarn subjected to false twisting. However, the textured yarn obtained by this method has greatly reduced unevenness in the thickness of the yarn and has improved uniformity in the longitudinal direction of the yarn. It was monotonous and lacked natural spun yarn-like unevenness and natural appearance change.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned drawbacks of the conventional processed yarn, and provides a bulky processed yarn having a loose spiral crimp of S twist and Z twist in addition to loops and slacks. It is an object of the present invention to provide a method for producing a bulky fan sea yarn which is rich in soft volume and can give a natural appearance change to a fabric.

(Means for Solving the Problems) That is, according to the present invention, after giving false-twisted crimp to a thermoplastic synthetic fiber multifilament yarn, intermittent false-twisting operation is performed to make S-twist in the longitudinal direction of the yarn. And a twisted bundle and a non-twisted portion, which are bundled by Z twisting, are alternately formed, and then the yarn is subjected to entanglement treatment with a fluid to generate a large number of loops, entanglements or slack in the yarn. The gist of the present invention is to provide a method for producing bulky fancy sea yarns, which has a bulkiness of 200% or more in bulkiness.

 Hereinafter, the present invention will be described in detail.

First, in the present invention, crimping is performed by performing false twist crimping on a thermoplastic synthetic fiber multifilament yarn.
Here, false twist crimping is applied to the filament by synergistic action with the alternate twisting formed by the subsequent intermittent false twisting operation to form a spiral crimped form on the yarn,
This is in order to obtain a yarn which gives a fabric with a sense of volumum.

To achieve the above objective, the number of false twists (T / M) (D is the denier of the multifilament yarn). The false twist temperature is preferably set to 160 to 240 ° C., and the overfeed rate is preferably set to give a twisting tension of 0.05 to 0.30 g / d. In addition, as a method for applying false twist crimping, a spindle method, a friction method, a swirling air method, or the like is used.

Next, an intermittent false twisting operation is performed on the yarn to which the false twist crimp has been applied, and a twisted bundle and a non-twisted portion which are bundled by S twist and Z twist in the longitudinal direction are formed alternately.

When intermittent false twisting is applied to the false twisted crimped yarn, crimping by false twisting (coiled crimp with the same number of coils in the S and Z directions) and S twisting by intermittent false twisting, Z twisted crimps are added and combined to form a loose spiral crimped twisted bundle. For example, when false twist crimping is performed in the S direction and subsequently the intermittent false twist operation is performed in the S direction (same direction), twisted twists are converged at the S twisted portion in the same direction (not yet twisted). Untwisting remains), resulting in a relatively small spiral crimped form.

On the other hand, the Z-twisted part in which the direction of false twist crimping and intermittent false twisting is in the opposite direction is over-untwisted and the false twisted crimp is twisted in the opposite direction. Becomes

In addition, a bulky non-twisted portion having no convergence is formed between the twisted and bunched portions that are bundled by the S twist and the Z twist.

On the other hand, when the twisting directions of the false twisting and the intermittent false twisting operations are reversed, the crimping torques of the two cancel each other out, and a stable alternately twisted crimped yarn without torque can be obtained.

The intermittent false twisting operation may be performed continuously by alternately changing the twisting direction to S twisting-Z twisting, or by intermittently combining S twisting, Z twisting, and stopping. May be performed. In either case, the principle of applying twist to the yarn is the same, and sufficient twist can be left.

In addition, as a false twist device used for intermittent false twist operation, a fluid false twist device using an air swirling flow (air false twist nozzle)
Is preferred.

Here, the intermittent false twisting operation using the air false twist nozzle will be described. The false twisted crimped yarn is passed through an air false twist nozzle, and the fluid is intermittently supplied to the air false twist nozzle. And S / Z alternate twist using the same.
In this case, an untwisted portion is formed when the fluid stops, while
An overtwisting portion is formed when the fluid is supplied. Then, a non-twisted portion is formed between the untwisted portion and the overtwisted portion and between the overtwisted portion and the untwisted portion. A heating device can be installed upstream of this intermittent false twisting device to perform intermittent false twisting operations while performing heat treatment. In this case, in addition to the twisting effect, crimping by twisting, heat setting, and untwisting is performed. An effect can be added.

In the present invention, the crimped yarn subjected to the intermittent false twisting operation has
Fluid treatment using an injection nozzle having a filament entanglement function, such as an interlace nozzle, generates a large number of loops, entanglements, or slacks in the yarn, and has a bulky degree of bulkiness of 200% or more. Get.

The fluid treatment in the present invention is to untwist a part of the S, Z alternating twist and form a loop by using the slack of the yarn due to this untwisting. The fluid entanglement treatment is particularly limited to under the overfeed. It is not what is done.

Normally, when a multifilament yarn is subjected to a fluid entanglement treatment in a supercharged state, it becomes a large yarn of an overroll loop,
When the fabric surfaces are overlapped with each other, the overroll loop becomes entangled and hardly peels off. However, as described above, the bulky franc yarn obtained according to the present invention has the fact that the filament has a crimp, and that the S twist and the Z twist
By being twisted and converging, and exhibiting a gentle spiral shape, the fastener phenomenon can be greatly reduced.
Furthermore, since the twist density changes in the longitudinal direction, when an injection fluid is applied, an over-rolled loop with inverted crimps whose degree of untwisting or opening varies greatly depending on the length of the twist pitch is formed. In addition, the untwisted portion is not bundled, so that it becomes a thick portion having a large overroll loop. By knitting and weaving using this fancy sea yarn, substantial thickness and elasticity are added to the fabric, and a soft volume is obtained. It is possible to obtain a fabric rich in unevenness change with a feeling.

The overroll loop in the present invention is defined as the second
As shown in the figure, it refers to a loop protruding from the entangled portion diameter (d) of the shaft core, and the substantial outer diameter (D _L ) of the yarn is determined by the size of the overroll loop.

FIG. 3 is a schematic view showing an example of a bulky fan sea yarn obtained by the present invention. FIG. 3 (A) is an over-twisted portion having a twist (Z twist) in a direction opposite to the intermittent false twist direction, and FIG. ) Is an untwisted portion having a twist in the intermittent false twist direction (S twist),
The part (A) has a slightly larger spiral crimp than the part (C) because it is over-twisted. In the parts (A) and (C), fine inverted roll rolls (L _a ) and (L _c ) are formed by alternately twisted pitches, and in the non-twisted part (B), A large overroll loop ( _Lb ) is formed.

FIG. 1 is a schematic process drawing showing an example of the present invention, in which a multifilament yarn (F) drawn from a pan (1).
Is supplied to a first delivery roller (5) via a supply roller (2), a first heater (3), and a spindle (4), and is false-twisted between the supply roller (2) and the first delivery roller (5). Processing is performed. Subsequently, intermittent false twisting is performed between the first delivery roller (5) and the second delivery roller (7) by the intermittent false twist device (6). On this occasion,
A second heater (12) may be provided between the first delivery roller (5) and the intermittent false twisting device (6) to perform heat fixing. Next, after the fluid treatment is performed by the injection nozzle (8) between the second delivery roller (7) and the third delivery roller (9), the package (1) is taken up by the winding roller (10).
Winded up as 1). The fluid treatment may be performed between the second delivery roller (7) and the take-up roller (10) without providing the third delivery roller (9).

Examples of the thermoplastic synthetic fiber multifilament yarn used in the present invention include a multifilament yarn such as polyester and polyamide, and may be either a normal drawn yarn or a highly oriented undrawn yarn obtained by high-speed spinning.

The degree of bulkiness is the percentage of the average value E of the measured yarn diameter of the multifilament yarn to the theoretical yarn diameter F of the yarn.

Degree of bulkiness (%) = (E / F) × 100 The average value E of the measured yarn diameters is determined as follows. Prepare a multifilament yarn on a twisting machine under a load of 0.05 g / d, twist direction Z, twist number (D is multifilament yarn denier) T / M twisting is performed. Then, collect a sample length of 5 cm on a slide glass and
The yarn diameter is measured at 10 points with a microscope at m intervals, and the average value is E.

The theoretical yarn diameter F is determined from the definition formula of fineness (denier) as follows. w is the weight (g), F is the yarn diameter (m), l is the yarn length (m), and ρ is the density (g / m ³ ).

D = 9000 × (w / l) where w = π · (F / 2) ² · l · ρ Therefore, Ask for.

According to the experience of the present inventors, it is necessary to use a processed yarn having a degree of bulkiness of 200% or more in order to impart a swelling feeling and a voluminous feeling to the cloth. Has no swelling.

(Operation) In the present invention, first, the multifilament is subjected to false twist crimping. On top of the S and Z crimps in which the same number of coils in the S and Z directions are mixed by false twist, additional crimping action by intermittent false twisting is applied, and the crimps are coiled in the twist direction. An S twist bundle and a Z twist bundle having a helical crimp are formed, and between the S and Z twist bundles, a bulky untwisted portion which is not subjected to the twist bundling action is formed.

When the above-mentioned crimped yarn is subjected to a fluid entanglement treatment, the S and Z twist bundles, in which the number of twists has changed in the longitudinal direction of the yarn, are
A part of the S, Z alternating twist is untwisted, so that the filament is subjected to the spreading entanglement action to form an inverted overroll loop with crimps having different sizes of loops and sags. Further, a thick portion having a large crimped overroll loop is formed in the non-twisted portion which is not subjected to the twist converging action. Therefore, it is possible to obtain a bulky fan sea yarn having a thread form which is different in the form of loops in the longitudinal direction of the thread, and which is rich in unevenness and is structurally stable. It is possible to provide a franc effect and a soft sense of volume without causing a phenomenon.

(Examples) Hereinafter, the present invention will be described specifically with reference to examples.

Example 1 Polyester multifilament drawn yarn (150d / 48f)
In accordance with the process shown in FIG. 1, under the conditions shown in Table 1, false twist crimping, intermittent false twist operation and fluid treatment were performed. Further, as Comparative Example 1, a processed yarn was produced by performing the same processing as in Example 1 except that the false twist crimping was not performed.

The intermittent false twisting operation was performed by controlling the time for supplying compressed air to the air false twist nozzle in accordance with a command from the micro computer, and the twisting direction was one direction (S direction).

The textured yarn obtained in Example 1 was a bulky fan sea yarn having large and small loops and slacks in the longitudinal direction of the yarn, in which the shape and frequency were uneven, and which had a gentle spiral crimp.

Table 2 shows the physical properties of the processed yarns obtained in Example 1 and Comparative Example 1, and the results of weaving a 2/2 twill fabric using these processed yarns.

As is clear from Table 2, the woven fabric obtained from the processed yarn of Example 1 has a natural spun yarn-like appearance due to the unevenness of the surface and a soft and rounded touch, and is rich in volume. There was almost no occurrence of the fastener phenomenon.

(Effect of the Invention) Since the present invention has the above-described configuration, the S twist and Z
An untwisted or over-twisted section with a reversal overroll loop in which large and small loops with a helical crimped form are mixed, and a non-twisted section with a bulky overroll loop , And a bulky fancy sea yarn having a structurally stable yarn form can be obtained. Fabrication and knitting of this bulky fransi yarn has almost no zipper phenomenon peculiar to the fabric composed of the loop yarn, and has a natural spun yarn-like appearance change and a soft feeling of volume, which is rich in unevenness. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing an example of the production process of the present invention,
FIG. 2 is a schematic view showing the appearance of a yarn subjected to fluid treatment, and FIG. 3 is a schematic view showing an example of a bulky fan sea yarn obtained by the present invention. (3) First heater (4) Twisting spindle (6) Intermittent false twisting device (8) Injection nozzle (11) Package (12) Second heater

Claims (1)

(57) [Claims] A twisted bundle formed by applying false twist crimping to a thermoplastic synthetic fiber multifilament yarn and then performing an intermittent false twist operation to bundle the yarn by S twist and Z twist in the longitudinal direction of the yarn. And a non-twisted portion are formed alternately, and then the yarn is subjected to a entanglement treatment with a fluid, so that a large number of loops, entanglements or slacks are generated in the yarn, and the degree of bulkiness becomes 200.
% Or more, giving a bulkiness of not less than 0.1%.