JPH045772B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a non-crimped thermoplastic synthetic fiber multifilament yarn having minute and non-periodic spots in the fiber axis direction, and a method for producing the same. (Prior Art) A number of methods for producing drawn yarn have been conventionally provided, such as a method in which undrawn yarn is drawn using cold drawing pins at a stretching ratio equal to or lower than its inherent draw ratio to generate drawing unevenness; There is a method in which a gear is pressed against the undrawn yarn to partially stretch the yarn, and then the yarn is stretched to cause stretching unevenness. In these methods, the aim is to obtain a slab effect by making use of the difference in dyeability between areas that have been stretched as a result of uneven stretching and areas that have not been sufficiently stretched. However, on the other hand, the quality was inconsistent and the slabs were not natural. (Object of the Invention) The object of the present invention is to provide a speckled yarn having an extremely natural shading effect that has never been seen before, and a method for producing the same. (Structure of the Invention) According to the present invention, (1) a non-crimped mottled yarn obtained by incompletely stretching an interlaced yarn of undrawn yarn or semi-drawn yarn of thermoplastic synthetic fiber, /meter or more and less than 25 points/meter of residual entanglement points, and is composed of a dark dyed part and a lightly dyed ground yarn part that are finely spaced and non-periodic in the fiber axis direction, and the residual entanglement points (2) Undrawn yarn of thermoplastic synthetic fibers The semi-drawn yarn is subjected to a fluid treatment to give the number of entanglements of 30 to 300 strands/meter to provide inter-fiber entanglement, and then the yarn is incompletely stretched while being preheated at a temperature below its glass transition temperature. 10 pieces/meter or more25
Provided is a method for producing spotted yarn, which is characterized in that it generates residual entanglement points of less than 100 cm/meter. In order to facilitate understanding of the present invention, it is considered appropriate to first explain the method for producing spotted yarn, so this method will be described first. FIG. 1 is a schematic diagram showing the manufacturing process of spotted yarn in the present invention, and shows an undrawn yarn or semi-drawn yarn of thermoplastic synthetic fiber 1 (hereinafter simply referred to as "undrawn yarn or semi-drawn yarn"). ] is supplied from a supply roller 3 to a fluid jet nozzle 4 via a guide 2, and after being entangled, passes through a guide 5, and then a pair of preheating rollers for preheating the yarn 1 to below its glass transition temperature. 6. Non-uniform (incomplete) stretching is carried out between the separate roller 7 and a pair of stretching rollers 8 and 9, and then heat-treated with a heat fixing plate 10 as necessary. The roller 12 leads to the winding device 13. As the interlacing means used in the present invention, it is appropriate to use a so-called interlace nozzle.
Even a Taslan nozzle that generates a large number of loops can be used as long as the loops disappear by stretching and the entanglement remains, and in short, any type that creates a large number of interlace points can be used. The number of entanglements given before stretching may be appropriately selected from the range of 30 to 300 entanglements/meter depending on the purpose. In addition, as mentioned above, the residual entanglement points are set at 10 points/meter or more and less than 25 points/meter, but they mainly exist (for example, 80% or more, preferably 90% or more) remaining in the light dyed ground yarn part. Must be. Note that the intertwined point in the method of the present invention refers to a completely intertwined part, and is calculated using the following measurement method. A sample of about 1 m was taken, and the concentration was 0.1 g/d.
After suspending the load, mark a test length of 25 cm, float it in prepared warm water at 50° ± 5°C for 30 seconds, immediately read the number of completely entangled parts, and convert it to per meter. The following table shows the distinction between completely entangled areas, incompletely entangled areas, and non-entangled areas.

[Table] On the other hand, the stretching ratio used in the above process must be set at a ratio that will cause stretching unevenness, such as the specific stretching ratio × 0.8 times or less, or the natural stretching ratio + 0.1 times or less. One method is to use magnification as a guide. However, this is also related to the heating temperature of the undrawn yarn at that time, and if the temperature is high, it is preferable to set a lower magnification.In short, under the preheating conditions of the undrawn yarn at that time, It is necessary to stretch at a stretching ratio that leaves . Further, the material used must be an undrawn or semi-drawn yarn of thermoplastic synthetic fibers, and polyester fibers are particularly preferred since they tend to cause unevenness in stretching. Among them, the best results can be obtained by using a material with a specific stretching ratio (stretching ratio at which an elongation of 30% is obtained) of 2.8 to 3.2 times. Next, the speckled yarn obtained by the above process will be described. The speckled yarn of the present invention is obtained by drawing an undrawn or semi-drawn yarn of thermoplastic synthetic fiber, and is essentially a flat yarn speckled yarn, that is, a speckled yarn consisting of a filament without crimp. As shown in Fig. 3, this form is a filament yarn without crimp, in which the unentangled part a remains as an undrawn part (dark dyed part), and the intertwined part b remains as a drawn part (light dyed part). It becomes (the fabric part). In the present invention, the intertwined points b that remain in the stretched form are referred to as residual intertwined points. And, this residual intertwined point is 10 points/meter or more and 25 points/
Existing at less than m. On the other hand, in the darkly dyed area, as shown in the figure, unstretched parts occur for each constituent filament, and these unstretched parts are arranged at minute intervals and in an aperiodic state. The total length of this darkly dyed part is 5% to the unit length of the spotted yarn.
Present in the 80% range. (Function) Method In the production method of the present invention, the undrawn yarn or semi-drawn yarn is preliminarily entangled at a rate of 30 to 300 entanglements/meter using a fluid jet nozzle, and then the yarn is heated to a temperature below the glass transition temperature of the yarn. It is important to perform incomplete stretching. In other words, if the preheating temperature is below the glass transition temperature, each intertwined point becomes a stress concentration point during stretching, and the number of intertwined points is equal to or equal to the number of intertwined points, or
Stretching starts reliably from the interlacing point, although it is accompanied by a slight decrease. At this point, stretching begins from the interlacing point. Here, along the yarn axis direction of the entangled yarn, there are completely entangled points, incompletely entangled points that tend to unravel, and furthermore, mere interlaced portions of fibers that are not suitable to be called entangled points, and non-entangled points that are not entangled at all. Various parts such as parts are mixed. When this yarn is completely drawn, the drawing starts from the completely intertwined point, progresses to the incompletely intertwined point, and then to the mere intertwined part, and finally the non-entangled part is drawn and the drawing is completed, leaving only the intertwined point, and the drawing is completed. Thread is made. However, when the yarn is completely drawn in this manner, the spotted yarn of the present invention cannot be obtained. The point of the present invention is to finish the stretching midway through, so that the fully entangled part has already finished stretching, but the incompletely entangled part includes some parts that have finished drawing and some parts that have not finished drawing, and is not. The intertwined portions remain as they are without being stretched at all. In this way, the stretched part, semi-stretched part, and unstretched part can be freely selected by changing the degree of entanglement in the fluid treatment, and the variegated yarn of the present invention is thus obtained. Here, when the preheating temperature is below the glass transition temperature, the reason why stretching starts from the complete entanglement point is considered as follows. In other words, when the preheating temperature is low, stress concentration occurs at the intertwined points, and stretching progresses back and forth from that point.When the stretching progresses to a certain extent and the stress becomes strong, the stress concentration occurs at the half-entangled points, and stretching is performed, and the final Specifically, unentangled parts where stress concentration is less likely to occur are stretched. On the other hand, stretching when the preheating temperature exceeds the glass transition temperature is
The stretching stress is low, making it difficult to create a stress gradient, and the interlaced points are tightly tightened by heat shrinkage, making them stronger in terms of stress than non-interlaced parts. Therefore, the stretching proceeds from the unentangled portions where the stress is weak, and in this case, it becomes difficult to notice the difference in dyeing density. Speckled yarn The characteristic feature of this speckled yarn is that it has 10 residual interlacing points.
There must be at least 25 people per meter and less than 25 people per meter. In this range, as shown in Figure 2, there is a gradient in the average length (mm) of the darkly dyed areas, resulting in an extremely natural appearance with a mixture of thin and long spots. Furthermore, in terms of the structure of the yarn, as shown in Figure 3, the unentangled point a, that is, the darkly dyed part, is not intertwined, so the single fibers in the darkly dyed part are moderately separated, so it is mild. It becomes a mottled yarn with a natural pattern. (Effects) Method In the conventional production of drawn uneven yarn, the occurrence of unevenness is completely up to you, so it is difficult to control and the result tends to be monotonous.However, according to the present invention, yarn entanglement and unevenness before drawing can be avoided. In combination with complete stretching, the occurrence of unevenness can be controlled. In addition, since incomplete drawing conditions are used during drawing, there are many troubles during spinning such as draw wraps, fuzz generation, yarn breakage, etc. However, if the single fibers are entangled before drawing, the roller It does not wrap around the fibers, etc., and can obtain yarn reeling properties comparable to those of ordinary stretching. In particular, as in this example, when the fibers are preheated to a temperature below the glass transition point of the fibers, that is, when the fibers are forcibly stretched without sufficient plasticity, fuzz tends to form, so entangling before stretching is very effective. Spotted yarn The spotted yarn of the present invention is not only easy to handle because it has entanglements, but also because the entanglement itself is the entanglement that remains after the entanglement applied before stretching, so that it can be looped like the entanglement applied after stretching. , there is no sagging, making it even easier to handle. (Example) Using the apparatus shown in Fig. 1, supply yarn polyethylene terephthalate undrawn yarn 150 denier, 36 filament 1 (specific draw ratio 3.0, glass transition temperature 73
°C) was intertwined and stretched under the following conditions. (Entanglement stretching conditions) (a) Supply roller 3 speed: 282 m/min (b) Preheating roller 6 speed: 273 m/min (c) Stretching roller 8 speed: 600 m/min (d) Take-up roller 11 speed: 660 m/min (e) Fluid injection Nozzle pressure 4 0.9Kg/cm ² (degree of entanglement 75
(f) Preheating roller surface temperature: 70℃ (g) Shrink plate surface temperature: 200℃ (ch) Stretching ratio: 2.1 (70% of the specific stretching ratio) The obtained yarn is 72 denier and has 36 tielaments, with residual The degree of confounding was 23 cells/meter, and the proportion of densely stained areas was 14% of the total. When a knitted fabric was knitted and dyed using this yarn, the appearance was a very random mixture of long and short spots, and most of the dark dyed areas (more than 90%) were not tightened by entanglement. It was a natural thing with a loose and natural feel. Comparative Example 1 When a knitted fabric was created in the same manner as in Example 1 by carrying out the same stretching without intertwining by fluid jetting, it did not have long and short irregularities as in Example 1, but The product had the appearance of monotonous rod-like spots with relatively uniform lengths, and had an artificial feel with an extremely poor natural feel. Furthermore, the stretch wrap rate during stretching was poor at 12%, and the yarns were uneven during knitting, resulting in poor knitting properties. Comparative Example 2 The drawn yarn in Comparative Example 1 was entangled by fluid jetting, and then knitted. Although the knitting properties were improved, the appearance of the knitted fabric remained monotonous, and the stretch wrap was not improved. In addition, if careful attention is not taken when interlacing the threads, loops may occur during interlacing, and these tend to get caught in the needles of the knitting machine, so this cannot be said to be perfect.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the method of the present invention, FIG. 2 is a graph showing the relationship between the degree of residual entanglement and the average length of the densely dyed area by fluid jet treatment, and FIG. FIG. a... Darkly dyed part in unstretched part (non-entangled part), b...
At the stretching part (entangled part), a light dyed ground yarn part, 1... undrawn yarn, 2... guide, 3... supply roller, 4... fluid jet nozzle, 5... guide, 6... preheating roller, 7... Separate roller, 8... Stretching roller, 9... Separate roller, 10... Shrink plate, 11... Take-up roller, 12... Separate roller, 13... Winding device, 14... Spotted yarn.

Claims (1)

[Scope of Claims] 1. A speckled yarn with no crimp obtained by incompletely stretching an interlaced yarn of undrawn or semi-drawn yarn of thermoplastic synthetic fiber, which is 10 yarns/meter or more and 25 yarns/meter or more. It has a residual entanglement point of less than a meter in size, and is composed of a dark dyed part and a light dyed ground yarn part which are finely spaced in the fiber axis direction and are non-periodic. A speckled thread that exists in the thread part and has a total (length) of the darkly dyed part of 5% to 80%. 2. After fluid treatment is applied to undrawn or semi-drawn yarns of thermoplastic synthetic fibers so that the number of entanglements is 30 to 300 per meter to provide inter-fiber entanglement, the yarns are heated at a temperature below their glass transition temperature. While preheating with
A method for producing spotted yarn, characterized by incompletely stretching and generating residual entanglement points of 10 or more and less than 25 per meter.