JPS5928647B2 - Method for producing yarn for strong cotton knitted fabrics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for producing synthetic fiber yarn used in strong linen knitted fabrics.

More specifically, the present invention relates to a method for producing a yarn used in a strong linen knitted fabric by using a specific twisted yarn using a conjugate fiber yarn.

[Prior art and its problems]

Conventionally, strong linen knitted fabrics have excellent drapability, crispness, transparency,
It is used in various products because of its excellent appearance.

Such strong linen knitted fabrics are generally manufactured by obtaining strong linen yarn with a strong twist using a linen yarn machine and then knitting and weaving using the yarn. However, productivity is low and costs are high, leaving many economic problems.

Therefore, many studies have been made to obtain strong Nene-like yarns.

For example, in the temporary twisting process, a method of obtaining a fused crimped yarn containing undissolved fibers by setting the temporary twisting temperature higher than the temperature for obtaining a normal temporary twisted yarn; A method of obtaining alternating twisted yarn with almost no crimp by setting the temporary twisting temperature to a temperature of Methods for obtaining shrunken fibers, etc., have been proposed.

However, since the fused crimped yarn containing the undissolved cotton part includes the crimped part, it has a yarn structure that is completely different from that of a normal strong cotton yarn.

In addition, alternating twisted and temporarily twisted yarn with almost no crimps is subjected to the temporary twisting process under harsh conditions, which generally results in a significant decrease in the strength and elongation of the yarn. In order to fuse the yarn, it has a completely different yarn structure from ordinary strong cotton yarn.

In addition, fused crimped yarns and alternating twist crimped yarns that utilize the melting point difference of various mixed fiber yarns can reduce the decrease in the strength and elongation of the yarn, but may contain partially crimped portions. Otherwise, the single fibers are still completely fused together, and similarly, ordinary strong cotton yarn has a completely different yarn structure.

In other words, the normal strong cotton yarn typically obtained with the Itari complete linen yarn machine is in the state of strong cotton yarn, in which the individual single fibers are simply in contact with each other, and of course, there is no adhesion at all. It is in.

In the above-mentioned conventional technology, the cost of the cotton yarn process is high, and in addition, wrinkles and the like are likely to occur, resulting in problems in terms of both cost and quality.

[Object of the present invention]

In view of the various problems in the prior art as described above, the present inventors have obtained a strong cotton-like yarn that has good productivity and can be made into a knitted fabric with extremely good texture and texture. As a result of intensive research, we have arrived at the method for producing yarn for strong cotton knitted fabrics of the present invention.

That is, the present invention provides a method for producing strong linen knitted fabric yarns of low cost and excellent quality by using specific composite fiber (conjugate fiber) yarns and using a specific temporary twisting method.

[Configuration of the present invention]

The present invention consists of the following configuration.

[When producing a strong linen knitting fabric yarn using a composite fiber yarn consisting of a synthetic fiber component A that can ultimately remain as a fiber component and a component B that is ultimately dissolved and removed, the composite fiber As yarn, the weight ratio of component A:acid component is 50:5
Using a yarn in the range of 0 to 90:10, applying a solvent to the yarn, and then swinging the yarn in the threading section and temporarily twisting the yarn while intermittently contacting the heating element. A method for producing yarn for strong cotton knitted fabrics.

In the method of the present invention, the synthetic fiber component A that can ultimately remain as a fiber component refers to ordinary thermoplastic synthetic fibers, such as polyester-based and polyamide-based synthetic fibers.

Component B, which is ultimately dissolved and removed, is a synthetic polymer that dissolves or flows in water or a simple solvent, such as modified polyvinyl alcohol, modified polyethylene, polystyrene, modified polyester, or modified polyamide. It is better to use coalescence.

For example, examples of combinations of component B and solvent are listed below: (1) Modified polyethylene synthetic polymer - percrene, (
2) Polystyrene synthetic polymer - tricrene, (3) Modified polyester synthetic polymer - thermal metacresol, (4) Modified polyamide synthetic polymer - ethyl alcohol, (5) Modified polyvinyl alcohol synthetic polymer - water or It is a combination of Marcel soap liquid, etc.

To describe component B in more detail, as the modified polyvinyl alcohol-based polymer material, it is preferable to use olefin-modified polyvinyl alcohol, plasticizer-added polyvinyl alcohol, or plasticizer-added polyvinyl alcohol.

Further, as the modified polyethylene polymer material, it is preferable to use polyethylene oxide to which 2 to 20% of glycerin or a derivative thereof is added.

In addition, modified polyester-based polymer substances are derivatives obtained by changing the ratio of terephthalic acid and isophthalic acid, the molecular weight of PEG, and the weight, such as terephthalic acid:
Preferably, the isophthalic acid is 2:1 or less, the molecular weight of PEG is 4000 or more, and the PEG component weight is 45% or more.

Further, the modified polyamide-based polymer material is preferably water-soluble polyamide (P, V, P2) or the like.

Next, in the present invention, the fiber component A and the dissolvable component B need to be yarns made of composite fibers (conjugate fibers) that have been spun into composite fibers.

This is to maintain good processability and quality of the thread.

Examples of the composite fibers include those shown in FIGS. 1 to 3.

In FIG. 1, 1 indicates component A and 2 indicates component B.

Then, fibers are obtained by composite spinning in the cross-sectional form examples shown in FIGS. 1, 2, and 3, and then the solvent is preferably attached to the stretched fibers. , under the condition in which the solvent is attached, the component B is subjected to a process of heating, heat treatment, and temporary twisting of the dissolved yarn, and the component B which has dissolved or flowed is fixed by the heat treatment, and the component B is temporarily twisted in the length direction of the yarn. The yarn is made up of a fused portion having a 3-IJ structure in the twisting direction and a non-fixed fused portion having a twisting structure in the unraveling direction.

To explain in more detail about FIGS. 1, 2, and 3, these figures are cross-sectional model diagrams showing one example of composite fibers that can be used in the present invention, and FIG. 1 shows multifilamentary fibers. Component A (number 1) is placed around it and the dissolved and removed component B
(No. 2) is arranged in a kind of core-sheath structure, and in Fig. 2, the fiber component A (No. 1) and the dissolved and removed component B (No. 2) are joined in a bimetallic manner. FIG. 3 shows a fan-shaped space of a Y-shaped dissolving/removing component B (number 2) filled with fiber component A (number 1).

A yarn made of such a composite fiber is subjected to a temporary twisting process of heating, heat treatment, and disassembly in the presence of the above-mentioned solvent.

FIG. 5 shows an example of such a temporary twisting process, in which the yarn 3 made of composite fibers as described above is coated with the solvent in the solvent coating device 4, and then transferred to the feed roller 5.
It is supplied to the Kanen area through the .

6 is a heating body (heater), and 8 is a temporary twist nozzle.

When the yarn 3 passes through such a processing step, the component B to be dissolved and removed first dissolves or flows in part due to the action of the solvent, and is then dried by heat from the heater 6 to fuse the individual fibers.

In the end, the component B to be dissolved and removed is subjected to a temporary twisting process while being dissolved or fluidized, and heat treatment is performed to melt and bond the components so that they cover each other around the yarn in a strong state.
The strong state becomes as if frozen.

Subsequently, the thread 3 is subjected to the de-stretching action as it passes through the temporary twist nozzle, but the de-stretching in the de-stretching area is incomplete, and the strong yarn having a twist structure in the opposite direction to the direction of the tentative twisting becomes the yarn. The part that will remain in the yarn and has a twisted structure in the opposite direction to the temporary twisting direction will not be destroyed along the yarn length direction, so that the dissolving adhesive structure of the twisting structure in the above-mentioned twisting direction is not destroyed. It is formed as a non-fixed fused portion having a twisting structure substantially in the group direction at appropriate intervals.

Thus, fused portions having a twisted structure in the tentative twisting direction and non-fixed fused portions having a twisted structure in the unraveling direction are formed randomly along the yarn length direction. The fused portion generally has a monofilament-like rod-like structure at first glance, and the non-fixed fused portion has a coil-like structure.

In the portion exhibiting this coiled structure, the single yarn itself is fused in its yarn cross-sectional structure, but the loops of the coiled structure are not substantially fused together.

The preferably formed yarn according to the method of the present invention has a twisted structure in the tentative twisted direction in the fused part, a twisted structure in the non-fixed fused part, and a twisted structure in the twisted direction as a whole (S twist number of S twisted part and 739 ), the average twist coefficient is ≧
10,000, and the yarn is substantially composed only of the two twist structures.

However, the twist coefficient is -TV■ T: Number of twists per 1m D: Thread denier It is.

Preferably, in carrying out the method of the present invention, and at the same time obtaining a preferable yarn exhibiting a high average twist coefficient as described above, it is assumed that the yarn will be completely removed in the end and that it will be dissolved or It is important to use an appropriate ratio of component B, which causes fluidity, and synthetic fiber component A, which does not substantially dissolve or flow due to the solvent.

That is, according to the findings of the present inventors, synthetic fiber component A
The usage ratio of the dissolved and removed component B is a weight ratio of A:B of 50:
A ratio of 50 to 90:10 is required, especially 80 to 20.
~70230 is the best in terms of effectiveness.

If the weight ratio of the component B to be dissolved and removed exceeds 50%, the strong fiber state will be almost completely frozen in the yarn length direction in the fiber region, resulting in a monofilament-like shape as a whole. The yarn generally has the appearance of a thread, and the unraveling in the unraveling region is completely incomplete, and reverse twist insertion becomes unstable, and problems such as yarn breakage are likely to occur, making processing generally impossible.

On the other hand, if the weight ratio of the component B to be dissolved and removed is less than 10%, the ``freezing'' of the strong carbonate state in the carbonate region will be incomplete or insufficient, and in this case, one of the conventional methods described above In much the same way as obtaining an alternately twisted crimped yarn using the melting point difference of mixed fiber systems, it is generally difficult to obtain a yarn consisting only of the S twist part and the 739 part, which exhibits a high twist coefficient. be.

In addition, when carrying out the method of the present invention, the fused portions having a twisted structure in the temporary twisting direction and the non-fixed fused portions having a twisted structure in the unraveling direction are randomly stabilized in the length direction of the yarn. In order to make the yarn 3 and the heater 6 intermittently, it is necessary to take particular care to ensure that the yarn 3 and the heater 6 are brought into contact intermittently.

Such intermittent contact is caused by the yarn swinging device 7 as shown in FIG.
By engaging the yarn 3 with the yarn 3 and swinging the yarn 3 at an arbitrary period, a fused portion having a twisted structure in the temporary twisting direction with respect to the yarn length direction and a non-fused portion having a twisted structure in the unraveling direction are formed. The proportion of the fixedly fused portion can be controlled arbitrarily.

The degree of continuous contact of the yarn with the heater in this false twisting process is to actively control the length and number of the fused portion and the unfixed fused portion, but the number of twists and tension It is necessary to make appropriate adjustments according to conditions such as the temperature of the heater and the like.

Through the above steps, the yarn that has been subjected to heating, heat treatment, and destrengthening in a stable state is passed to the second feed roller 1.
0 and is wound onto a drum 11 via a guide or the like.

As described above, the yarn preferably obtained by the method of the present invention consists of an S twist structure part and a Z twist structure part with an average twist coefficient K of 1oooo or more, as described above and as shown in the model in FIG. Become.

If the temporary twist direction is the S direction, the S twist structure is the fused part,
If the Z-twist structure is the fixed fusion part (FIG. 4), and the temporary twist direction is the Z-direction, this will be the opposite.

After the yarn is subjected to weaving and weaving to form a fabric, the component B to be dissolved and removed is removed.

For example, after weaving using such threads as both or one of the warp threads and weft threads, and after performing grain setting and intermediate setting,
By completely removing the dissolved and removed component B by weight reduction processing, etc., and completely removing the fused structure contained in the yarn, the S-twist structure and Z-twist structure, respectively, have almost the same structure as ordinary strong cotton yarn. A strong linen fabric with a good feel can be obtained, which is made of yarns that are substantially composed only of structural parts.

In particular, when it is desired to make the appearance characteristics of the knitted fabric more uniform, the secondary heater 9 as shown in FIG. By applying a reheat setting action, the torque possessed by the non-fixed and fused portion can be lost, which is effective because it can improve operability and yarn handling properties.

In short, by adhering to a solvent and using a good combination of components A and B, it is possible to create a yarn that is essentially composed of only the S twist structure and the Z twist structure, which has an extremely high average twist coefficient, and can also be made into a fabric. In the present invention, it is possible to form a thread that substantially maintains the twisted structure even if the dissolved and removed component B is completely removed after being removed by heating, heat treatment with a primary heater, and temporary twisting process of the dissolved thread. This is an important point.

[Effects of the present invention]

As described above, in the present invention, a yarn made of conjugate fiber is used, and after being coated with a solvent, it is subjected to a temporary twisting process, and at this time, the yarn is swung in the twisted part and brought into contact with a heating element intermittently. Since it is processed simultaneously, it is possible to efficiently create a yarn consisting of a fixed fused part having a twisted structure in the temporary twisting direction in the length direction and a non-fixed fused part having a twisted structure in the unraveling direction. be able to.

In addition, since the fixed fused portion converges the temporary torque of each constituent single fiber, the loosening torque is concentrated and expressed during graining, and a grained product of good quality can be obtained.

Therefore, even though it is a temporary twisted yarn, it exhibits a better texture than strong cotton yarn.

In addition, since the dissolved and removed component B is finally removed, voids are created between the constituent single fibers, and an effect similar to that of silk sericin is obtained, resulting in a good texture.

This will be explained below using examples.

Example 1 A polyester-based synthetic polymer (synthetic fiber component A) and polystyrene (dissolved and removed component B) were mixed at a composite ratio (weight ratio) of A to B of 7:3, and a core having a cross-sectional shape shown in FIG. The denier is 75 after removing the polystyrene.
Composite spinning was performed to obtain filaments of denier and 36 filaments, and after drawing, at a heater temperature of 150°C, while attaching perclene, the insertion twist coefficient was set to 35,000, and the heater length was 3.
0 box, yarn oscillation rate 6 times/sec, yarn speed 180 m/min, temporary twisting process was performed while intermittent heating, and the average twist coefficient = 12000 from only S twist part and 739 part. I got a thread made up of.

After weaving using such threads as warp and weft threads, the temperature is 95°C.
After applying the grain treatment with hot water of I was able to get it.

Example 2 Polyamide-based synthetic polymer (synthetic fiber component A) and modified polyvinyl alcohol polymer (dissolved and removed component B) were combined at a composite ratio (weight ratio) of A:B = 85 to 15, and the cross-sectional shape was modeled as shown in Figure 3. The denier is 140 denier and 48 denier after removing modified polyvinyl alcohol.
Composite spinning is performed to form a filament, and after drawing, while applying room temperature water to the yarn, the insertion twist coefficient is set to 280.
00, heater temperature 140°C1 heater length 30mm, yarn speed 2
Temporary twisting was performed at 10 m/min and the number of yarn oscillations was 30 times/second, and the average twisting coefficient was set to 2 while intermittently contacting the heater.
A yarn was obtained which was substantially composed of only the 1000 S twist portion and the 2 twist portion.

By using such a yarn as a weft yarn and weaving it alternately, the woven fabric was embossed in hot water at 95°C, and subsequently, the modified polyvinyl alcohol component was reduced with 3 g of Marcel soap and 1 liter of liquid. When completely removed,
It was possible to obtain an Ichikoshi-style crepe fabric with good texture and appearance.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are model diagrams showing examples of cross-sectional forms of composite fiber filaments obtained by composite spinning that can be used in the present invention, and FIG. 4 is a yarn obtained by the present invention. It is a side model diagram showing the structure of
It is a structural model diagram in which the twist part is a non-fixed fusion part, and the fifth
The figure is a process schematic diagram showing an example of a temporary twisting process that can be employed in the method of the present invention. 1... Synthetic fiber component A, 2... Dissolved and removed component B13... Yarn, 4... Solvent adhesion device, 5... Feed roller, 6...
...Heating body (heater), 7... Thread swinging device,
8...Temporary twist nozzle, 9...Second heater, 10...Second feed roller, 11...
...Drum 0

Claims (1)

[Claims] 1 Synthetic fiber component A that can ultimately remain as a fiber component
and Component B, which is finally dissolved and removed, to produce a yarn for strong cotton knitting fabrics.
: Using yarn in the range of 50 to 90:10, attaching a solvent to the yarn, and then shaking the yarn in the threading section and subjecting it to temporary twisting while intermittently contacting the heating element. A method for producing yarn for strong cotton knitted fabrics, characterized by: