JPS5920011B2 - Bunching polyamide crimped yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile yarn for carpets and a crimped bundled polyamide yarn suitable as a pile yarn for cut-pile carpets.

In recent years, crimped yarn (BCF) made of polyamide multifilament has come to be used for tufted carpets, especially cut pile carpets.
CF) is generally used as pile yarn for carpets after being twisted at 30 to 250 T/m and then heat-set by dry heat with saturated steam or the like to stop twisting.

Such twisted yarn - heat-set crimped yarn (sera) BC
In F), crimpability is moderately adjusted by heat setting, and convergence is imparted by twisting, so when this yarn is used for cut pile carpets, good quality carpets with pencil point properties can be obtained. It will be done.

However, the bundled crimped yarn (Cera) BCF) obtained by the twisting-heat setting method 1 has the problem that the production cost is extremely high because it requires the steps of twisting and heat setting. When a cut pile carpet made of curly yarn (BCF) is used for a long period of time, it will gradually pile up;
There is a problem that the cohesiveness of the thread is reduced and the pencil point property is impaired.

For this reason, attempts have been made to omit the twisting-thermal setting process of crimped yarns for carpet pile lighting and to give them convergence by other means. Method for adding interlacing (U.S. Patent No. 36)
11689), and a method of imparting latent twist to the yarn by further applying a false twisting process using a fluid after imparting interlacing (
U.S. Patent No. 3968638) etc. have been proposed,
With these methods, it is difficult to provide uniform convergence over the length of the crimped yarn due to interlacing;
Furthermore, there is a problem in that dyeing spots occur because the threads are tightly bundled in the strong interlace portion.

The present inventors have conducted extensive research into a crimped polyamide yarn that is used as a pinole yarn for cut pile carpets in order to provide a crimped yarn that does not have the above-mentioned drawbacks and can form carpets of excellent quality. As a result, it was discovered that a new polyamide crimped yarn different from conventional ones can be obtained by introducing a false twist fusion process, which had never been used in this field, and the present invention was achieved. be.

That is, the polyamide crimped yarn of the present invention has a total crimp rate of 5 to 15%, the constituent single yarns are partially fused to each other with a fusion rate of 0.5 to 40%, and , has an alternating twist in which S-twist portions and 2-twist portions exist at random intervals in the length direction, has an agglomeration coefficient of 5 to 100, and is 20 to 300 T.
/m, with a total denier of 600-6
000 de, and single thread denier is 6 to 30 de
This is a bundled polyamide crimped yarn suitable as a carpet pile yarn made of polyamide multifilament.

The multifilament constituting the bundled polyamide crimped yarn of the present invention is made of aliphatic polyamide, such as nylon 6, nylon 66, or a copolymer thereof, which easily becomes sticky and partially fused by the action of water molecules. Multifilament is suitable.

The total denier of the multifilament is 600-6000
de, and the single yarn denier is 6 to 30 de.

If the total denier is less than 600 deniers, it is too thin and unsuitable for carpet use, and if it exceeds 6000 deniers, it is too thick and difficult to apply to a tufting machine.

Moreover, if the single yarn denier is less than 6 de, it becomes too soft (too soft), and if it exceeds 30 de, it becomes too hard, and neither of these is suitable for carpets.

The filament cross-sectional shape of each single yarn may be a normal circular shape,
It may be non-circular, such as a triangle, square, cross, or trilobal shape.

Further, the filament may have one or more hollow portions continuous in the length direction inside the filament.

In the present invention, the multifilament can also be composed of two or more types of single yarns, for example, two or more types of single yarns that differ in filament cross-sectional shape, denier, thermal properties, mechanical properties, dyeability, etc. Alternatively, one part of the single yarn may be made of a conductive filament.

The crimped yarn of the present invention has any form of crimp, preferably a non-helical crimp, but when the crimped yarn is used as a pile yarn in a cut pile carpet, the total crimp rate exceeds 15%. The carpet becomes felt-like,
Further, if it is lower than 5%, it is not preferable because it lacks a sense of volume and lacks quality.

Therefore, in order to maintain good quality as a cut pile carpet, it is necessary to have a crimp of 5 to 15% in terms of total crimp rate, and a total crimp rate of 7 to 13% is particularly preferable.

In the crimped yarn, the single yarns constituting the multifilament are partially fused to each other and bundled as a whole, and the S-twist portion and the two There is an alternating twist in which twisted portions alternate with each other at a random period.

"Partial fusion" here refers to a state in which multiple single filaments are incompletely fused, and it is not a state in which the entire multifilament is fused to the extent that it becomes one, but simply a state in which the entire yarn is fused together. This means that the fibers are partially and randomly fused to the extent that cohesiveness is maintained, and each single fiber can be separated relatively easily.

In addition, in "alternate twisting", partial fusion occurs in the heated state due to the false twist fusion process, and the fused parts remain randomly in the crimped yarn in an untwisted state, so when untwisting, it is difficult to match the untwisted yarn. The twist in the direction is applied as if it were over-untwisted, and as a result,
In the length direction of the crimped yarn, S-twisted portions and Z-twisted portions exist alternately at random intervals, so that the yarn as a whole resembles a true twisted yarn (approximately uniform collection over the entire length; The cross section of the yarn is almost circular.

The convergence imparted by partial fusion etc. is suitably in the range of 5 to 100 in terms of a cohesion coefficient measured by the method described below.

If the agglomeration coefficient is less than 5, the cohesiveness will be insufficient and the handling properties (particularly the tufting properties) will be poor, and when it is suitable for cut pile carpets, it will become felt-like and good pencil point properties will not be obtained.

On the other hand, if the agglomeration coefficient exceeds 100, the convergence will be too high, the electric property will be too low, and the texture will also become hard (undesirable).

This agglomeration coefficient) can be adjusted as appropriate by selecting the heat setting conditions in the false twist fusing process described below.

In the present invention, the agglomeration coefficient is particularly preferably in the range of 10 to 30,
According to this range, the crimped yarn has appropriate volume and cohesiveness, and a cut pile carpet of optimum quality can be obtained.

Note that the agglomeration coefficient of the interlaced product described in U.S. Pat. No. 3,968,638 is approximately 1.
A relatively low degree of entanglement, such as a cohesion coefficient of 5 or less, results in insufficient cohesiveness and poor handling, but since the crimped yarn of the present invention has alternating twists, even with a cohesion coefficient of 5 to 15, the entire yarn is Since the yarn has a rounded cross-section and maintains a good convergence state, it exhibits good handling properties similar to those obtained by the conventional twisting-heat setting method.

The degree of partial fusion is determined by the number of fused parts expressed as a percentage of the total number of single yarns, and the total number of single yarns from 00.5 to 4.
It is 0%.

That is, if the degree of fusion is large and the fusion rate exceeds 40%, the crimped yarn will have a hard texture, making it difficult to obtain a carpet of good quality.

On the other hand, if there is little fusion and the fusion rate is less than 0.5%, the effect of the false twist fusion process is poor and the necessary cohesion coefficient and potential torque index are often not achieved.

The crimped yarn of the present invention further needs to have a potential torque of 20 to 300 T/m.

This latent torque is a property of the crimped yarn, which is caused to rotate by itself due to the torque when one end of the crimped yarn is left free and treated in steam or hot water, resulting in a real twist.

Therefore, when a cut pile carpet is formed using this crimped yarn and the carpet is treated with steam or hot water, the cut pile yarn naturally becomes twisted and the pile yarn is bundled and stabilized.

If the potential torque index is less than 20 T/m, there will be no such self-twisting effect and the pile will not converge.

On the other hand, if it exceeds 300 T/m, the pile will become too concentrated, resulting in a hard texture and poor quality.

The polyamide crimped yarn of the present invention having such a structure and characteristics has sufficient cohesiveness due to the presence of partial fusion and alternating twist, and the entire yarn cross section is rounded and almost circular, making it easy to handle. It has excellent properties (especially tufting properties).

Furthermore, since the yarn does not have strong interlaced parts, there is no dyeing spot and the level dyeing property is also good.

Furthermore, by selecting the degree of partial fusion and potential torque index of the crimped yarn, desired appearance and texture can be given to the pile yarn. For example, by increasing the degree of partial fusion and the potential torque index, It will have a firm texture similar to bird twist, and if the degree of partial fusion and potential torque index are reduced, it will have a soft texture.

In addition, it is also possible to mechanically separate the partially fused yarns in the crimped yarn, so after making it into a carpet, the pile yarn is mechanically treated to separate part or all of the partially fused yarns and make it flexible. It can also have a rich texture.

Conventional twisted yarn - crimped yarn by heat setting method (Set BCF)
Cut pile carpets using the crimped yarns of the present invention tend to lose their cohesiveness as the twist in the pile yarns gradually disappears when the carpets are used for a long period of time. The twist of the pile yarn is difficult to lose due to use for a period of time, and even if the twist is lost, the twist can be restored by steam or hot water treatment because it has latent torque.

Furthermore, since the self-twisting effect of the crimped yarn of the present invention due to manifestation of torque differs depending on the conditions of steam or hot water treatment, the pile yarn can be bundled by locally changing the treatment conditions after being made into a cut pile carpet. The condition can be locally changed, and therefore, it is also possible to produce products with unique appearance and texture by the above-mentioned treatment.

The polyamide crimped yarn of the present invention as described above is produced by supplying a crimped yarn (BCF) made of polyamide multifilament to a false twisting heat setting device and twisting it into 100 to
While applying false twist of 1000T/m, i
By heating with steam at a pressure of s kg/Cf1cx or more to partially fuse the constituent single yarns to each other, and then taking them off with the partially fused parts remaining, it is possible to achieve high productivity and extremely economically. can be manufactured.

As the supplied crimped yarn, polyamide multifilament crimped by a known method is used.
Among these, those having non-helical crimps by heated fluid injection crimping, forming crimping, push crimping, etc. are suitable;
Crimped yarn (BCF) obtained by supplying polyamide multifilament into a heated fluid to form loops and slack between the single yarns, and then opening the fibers by giving an appropriate draft, as shown in No. 33430, etc. is preferably used.

In addition, if a crimped yarn (BCF) with a low draft rate and loops or slacks are used is used, a spun-like electrically conductive yarn can be obtained.

In the present invention, it is also possible to use two or more types of crimped yarns together, and it is also possible to use a combination of yarns with different crimp forms and crimpability.

It is necessary that the total crimp rate of the supplied crimped yarn is 5 to 30%, and if it is outside this range, it becomes difficult to obtain a cohesive polyamide crimped yarn with a total crimp rate of 5 to 15%.

Hereinafter, the method of the present invention will be explained with reference to the drawings.

Figure 1 shows one of the false twisting and fusing processing apparatuses for carrying out the method of the present invention.
It is a simplified side view showing an example. In the figure, the crimped yarn 1 unwound from the package is wound around a supply roller 2 several times and supplied at a constant speed.

At this time, in order to stabilize the running performance of the yarn on the supply roller 2, it is preferable that the separate roller 3 is a grooved roller.

Furthermore, in order to prevent the twist from coming back from the downstream side on the supply roller 2, a freely rotating presser roller 4 is provided on the supply roller 2 to nip the yarn and prevent the twist.

Next, the crimped yarn 1 is supplied to the heater 5 and heated to a temperature equal to or higher than the softening point of the supplied yarn.

As the heater 5, a non-contact type pipe heater as shown in the figure is preferable, and the heating method is heating with water vapor which can easily cause fusion to the polyamide thread.

The yarn leaving the heater 5 then enters a false twisting nozzle (air torque jet) 6 by means of a gas swirl flow, where the yarn is given a false twist.

This twist goes back to the heater 5 and spreads to the nip point between the supply roller 2 and the presser roller 4.

The number of false twists imparted by the false twist nozzle 6 is 100 to 100.
It is necessary to set the number of twists to 0T/rrL; if the number of twists is less than this, the self-twisting effect due to potential torque is poor, and if the number of twists exceeds 100OT/m, it is not possible to stably twist the yarn.

Here, it is also possible to connect the heater 5 and the false twisting nozzle 6 and use the same heating gas for both, but in this case, since the yarn is wound while being heated, the heater 5 and the false twisting nozzle 6 can be connected as shown in FIG. It is preferable that a false twisting nozzle 6 is provided separately, and in the latter, false twisting is applied while cooling the yarn using air at room temperature.

The thus false-twisted yarn is wound several times around a take-up roller 7 and taken off, and then wound up by a winder 10.

In order to improve the running stability of the yarn on the take-up roller T, the separate roller 8 is a grooved roller, and in order to prevent false twist from spreading to the winding side, a freely rotating presser roller 9 is used to tighten the yarn. Preferably, the strips are nipped.

In this method, the heating conditions for the heater 5 (temperature, pressure, etc. if water vapor is used as the heating medium);
By appropriately selecting the number of false twists, processing tension, etc., the total crimp rate, agglomeration coefficient, potential torque index,
The fusion rate can be adjusted to a desired value.

In this case, the temperature and pressure of the heating medium may be appropriately changed depending on the type of polyamide, denier, yarn running speed, length and thickness of the heater, etc. so as to obtain desired characteristic values.

Generally, in the method of the present invention, false twisting and fusing processing is performed under tension, so the total crimp rate after processing is somewhat lower than the total crimp rate in the supply system, making it suitable for pile yarns for cut pile carpets. The crimp rate is adjusted to 5-15%.

In the example shown in Figure 1, the crimped yarn (
BCF) is supplied to the false twisting heat setting step, but the crimp step and the false twisting heat setting step may be carried out consecutively, and the spinning-drawing step, the crimp step and the false twisting heat setting step may be carried out in succession. The setting steps may be connected.

Next, methods for measuring the total crimp rate, agglomeration coefficient, potential torque index, and fusion rate as used in the present invention will be explained in detail.

(1) Total crimp rate (TC) Total crimp rate (TC) indicates the degree of crimp of the yarn.The crimped yarn is taken out from the package to a length of about 1 m, and the crimped yarn is taken out from the package to a length of 0.
After 1 minute under a load of 1f/de, the trial 1° was measured, the sample was allowed to develop crimps for 30 minutes while diving in a free state, dehydrated, air-dried for 1 day and night under standard conditions, and then the sample was given 0. 1
? The length 11 was measured after 1 minute under the load of 2 rn'? / d
Trial 12 was measured after 1 minute under a load of e, and the total crimp rate (TC) was calculated from these measured values using the following formula.

(2) Cohesive coefficient (CF) The cohesive coefficient is a value that indicates the convergence of the yarn, and the yarn is placed horizontally, with both ends free of tension, and the yarn is oriented approximately half way up and down in the axial direction. Divide it, hang the upper part on a fixed hook, and crimped the remaining half of the yarn with 0.29 per total denier of the crimped yarn.
A load of / de is applied, the width W expanded vertically at that time is measured, and the cohesion coefficient (CF) is calculated using the following formula.

CF=100 (clrL)/W (crrL) Note that the length of the sample is 50 m or more, and it is randomly sampled.

The larger the value of this cohesion coefficient (CF), the higher the convergence.

(3) Potential Torque Index Take out the crimped yarn from the cheese, collect a yarn length of approximately 30 CrrL, mark one side of the yarn with oil-based ink, and soak the yarn in saturated steam (approximately 100°C) for 5 minutes on one end. The yarn is hung in a free state, and the number of twists generated as the yarn rotates is counted and converted to the number of twists per meter ('T/m), which is used as the potential torque index.

The larger this value is, the greater the torque (swirling force) inherent in the yarn is.

(4) Fusion rate Take a microscopic photograph of the cross-section of the yarn, and in the photograph, treat the indistinct boundaries between single yarns as fusions, and tell them the number of fusions (fusions are the form of point adhesion). (If a single single thread is fused at two places around it, it is considered to be two pieces.)

The measurement using this cross-sectional photograph is repeated 10 times or more for samples taken randomly in the length direction of the yarn, and the average value is taken as the number of fused pieces, and the fused rate is determined by the following formula.

Number of fused pieces Fused rate - X100 (%) Composition of crimped yarn Number of single yarns Example 1 The following nylon 6 crimped yarn (BCF) was produced by injecting nylon 6 yarn onto a wire mesh from a heated fluid injection processing nozzle. ,
The fabric was supplied to the false twist heat setting device shown in FIG. 1, and subjected to false twist fusion processing.

Supply crimped yarn (BCF) *Yarn brand 5B2500 denier/136 filament Total crimp rate 15% Bulky property 16ca/g Number of crimp 400 pieces/m Cohesion coefficient 100/14 Potential torque index OT/m The heater 5 in the above device has a total length of 300mrtt , a pipe heater with an inner diameter of 5 mmφ and an orifice-shaped yarn inlet and yarn outlet (inner diameter 1.8 mmφ) is used, and superheated steam at a temperature of 200°C and a pressure of 20 to 30 kg/crA is introduced into the pipe heater. did.

On the other hand, the false twisting nozzle 6 has a slit-shaped air introduction hole with a depth of 0.5 mm x IJ3 mm in the tangential direction of a pipe-shaped yarn guide hole with an inner diameter of 3 mrnφ, so that a swirling flow is generated within the yarn guide hole. It was used.

Further, the processing speed was set to 500 m7 minutes, the yarn overfeed rate during processing was set to 5%, and the experiment was repeated by variously changing the pressure of air (room temperature) supplied to the false twisting nozzle.

Next, we measured the cord characteristics of the crimped yarns obtained in each experiment, used each crimped yarn as pile yarn to create cut pile carpets by the tufting method, and carried out drainage dyeing to improve the quality of the resulting carpets. , texture, etc. were determined.

The results are shown in Table 1 below.

Experiments 2 to 6 in Table 1 are according to the present invention, and the obtained crimped yarn has a moderate focusing effect, a secondary set effect of crimps,
Because it has latent torque, carpets made with it have a high pile and are of high quality with excellent appearance and texture.

However, when the air pressure is set to 0 and false twisting is not performed (Experiment 1), no fusion occurs and there is no focusing effect at all, and when the steam pressure is increased (Experiment A12), excessive ※※ fusion occurs. As a result, the crimped yarn became string-like and stiff, and its crimpability deteriorated.

Example 2 In the method of Example 1, the pressure of the air supplied to the false twisting nozzle 6 was set to 5.0 Y/crrt, and a similar experiment was conducted by variously changing the pressure of the superheated steam supplied to the heater 5. .

The results are shown in Table 2 below.

When there is no water vapor supplied to the heater or the pressure of the water vapor is low (Experiments A8 to 9), there is no fusion and the crimped yarn has poor cohesiveness (and the latent torque index is also small, resulting in poor tufting properties). Not only that, but cut pile carpets also became felt-like and of poor quality.

As the steam pressure was increased (experiment AIO~12), moderate fusion occurred and the convergence and potential torque index increased, resulting in various high-quality carpets ranging from twisted plush type to bird twisted type. .

However, if the water vapor pressure is too high (Experiment & 13), excessive fusion occurs, and the threads aggregate and become string-like, resulting in a hard texture.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a false twist heat setting device showing an embodiment of the present invention, in which 1 is a supply crimped yarn, 2 is a supply roller, 5 is a pipe heater, 6 is a false twist nozzle, and 7 is a puller. It is a take-off roller.

Claims (1)

[Claims] It has a total crimp rate of 15 to 15%, and the constituent single yarns have a fusion rate of 0.
In addition to being partially fused to each other in the range of 5 to 40%, it has alternating twists in which S-twist portions and Z-twist portions exist at random intervals in the length direction, and has an agglomeration coefficient of 5 to 100. can be,
A bundled polyamide crimped yarn comprising a polyamide multifilament having a potential torque index of 20 to 300 T/m, a total denier of 600 to 6000 de, and a single filament denier of 6 to 30 de.