JPH0217659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite mixed fiber yarn of a drawn polyester yarn and a rayon filament, and more specifically, the present invention relates to a composite yarn of a drawn polyester yarn and a rayon filament. The present invention relates to a method for more rationally producing a loop-forming composite mixed fiber yarn. In the past, various technologies have been known to combine synthetic fibers with excellent physical properties and cellulose fibers with hydrophilicity and easy dyeability, such as by compositing synthetic fibers with cellulose fibers or by blending them with pressurized fluid. It is being Part 1
The method is to wrap cellulose fibers around synthetic fibers using a twisting machine or false twisting machine to cover them, but this method tends to be expensive because the process is complicated and the speed is slow. Also, since the fibers on the wrapped side tend to move during the subsequent process, nepping tends to result in uneven patterns. Another method is to mix drawn or processed yarns of synthetic fibers with cellulose fibers through an entanglement process, but this method also requires a new entanglement process and double rollers to adjust the water supply rate. etc. are necessary. As a result of repeated studies on various fiber blending methods, the present inventors have developed a method for producing stable composite fiber yarns that can easily and rationally change the fiber blend state depending on the use and purpose. I ended up getting it. That is, the present invention only requires installing a nozzle for entangling treatment in the two-stage stretching section of an existing general two-stage stretching machine.
While stretching the polyester undrawn yarn, it is wound together with the rayon filament around a two-stage stretched supply roller after stretching, and the temperature of this supply roller is set to be a hot roller of 80°C or higher, and under an oversupply condition of 1 to 5%. This can be obtained by performing an entanglement process. Next, the manufacturing method of the present invention will be explained using the drawings.
FIG. 1 shows a typical example of an apparatus capable of carrying out the method of the present invention, in which A is an undrawn polyester yarn, B is a rayon filament, and R ₁ , R ₂ , and R ₃ are A roller, H is a heater, I is an entangling device, the first stretching section (first-stage stretching section) is between R ₁ and R ₂ , and the second stretching section (second-stage stretching section) is between R ₂ and R ₃ .
(step extension part). And _R2 serves as a heating roller. In the present invention, since the polyester undrawn yarn A needs to be drawn, it is drawn between R ₁ and _{R 2} .
On the other hand, since the rayon filament B cannot be drawn, it is necessary to double the undrawn polyester yarn A after the polyester filament A has been drawn, and the yarns are doubled after the position _R2 . In the present invention, the drawn polyester yarn and rayon filament are combined at the _R2 position, wound several times around the roller _R2 , and subjected to a loose entanglement process between _R2 and _R3 . In the present invention,
Since _R2 is a heating roller, the polyester undrawn yarn will shrink. Therefore, polyester drawn yarn maintains a tensioned state with almost no loosening even if the area between R ₂ and _{R 3} is relaxed by 1 to 5%, whereas rayon filament does not contract and remains taut between R ₂ and R ₃ . When the two are entangled, the polyester drawn yarn becomes the core yarn, and the rayon filament forms a loop. For example, if the rayon filament is directly introduced into an entangling device without being combined with the polyester drawn yarn at the heating roller _R2 position, almost no loops of the rayon filament will be formed, and the rayon filament will be in a relaxed state between _R2 and _R3 . There's no point in doing it anymore. In this way, the present invention uses a conventional two-stage drawing machine as it is without modification, draws undrawn polyester yarn, combines it with rayon filament, wraps it around a heated roller several times, and then stretches it in a relaxed state. The feature is that it performs entanglement processing. In the present invention, when drawing undrawn polyester yarn, it is possible to change the shrinkage rate after drawing by changing the drawing temperature and the drawing ratio, and the yarn shrinks depending on the temperature of the second drawing supply roller after the first drawing. Therefore, even if the two-stage drawing section is in an oversupply state, the polyester drawn yarn will not sag and will have tension. On the other hand, rayon filant yarn has a very low heat absorption rate, so it hardly shrinks even if the temperature of the two-stage drawing supply hot roller becomes high, and the yarn becomes slack due to the excessive supply rate of the two-stage drawing section. Become. Therefore, these drawn polyester yarns and rayon filament yarns are combined from a two-stage drawing supply hot roller, and by variously changing the hot roller temperature and excess supply rate, the difference in yarn length between the drawn polyester yarns and the rayon filament yarns can be changed. can be given. By performing the entanglement process in the two-stage stretching section, it is possible to mainly form loops of the rayon yarn. The shrinkage rate of the composite blended yarn obtained in this way can be freely changed as a whole, and since the rayon yarn is long and forms a loop, it is possible to adjust the polyester drawn yarn appropriately. It can exhibit a covering effect as a core yarn, and because it has been subjected to entanglement treatment, the loops do not move, and it has good unwinding properties and ease of passing through subsequent processes. Furthermore, since the slack of the rayon is fixed as a loop, the length of the loop and the degree of covering can be adjusted by changing the strength of the entanglement process and the number of additional twists. Therefore, it is possible to create a striped pattern with adjustable length on woven or knitted fabrics, which cannot be achieved with conventional covering yarns. Moreover, since the polymer is a combination of polyester and cellulose fibers, streaks and marbling patterns in various combinations of colors are possible. However, since the dyes that can be dyed are different, two stages of dyeing baths are required. In the present invention, in which a rayon filament is introduced during stretching of undrawn polyester yarn to easily and rationally produce an appropriate covering effect and streaking pattern with rayon, the temperature of the second drawing supply roller is 80°C. The higher the temperature is, the higher the temperature is, the greater the difference in yarn length from the excessively supplied rayon, and the more loops can be generated. Here, at temperatures below 80°C, the shrinkage of the polyester drawn yarn is small, and just like the rayon filament, both the mixed yarn or both filaments tend to form loops, which not only reduces the covering effect of rayon but also increases the oversupply rate. If it is made too large, both yarns become slack and tend to wind around the second drawing/feeding roller, resulting in frequent yarn breakage. Further, the thermal shrinkage of the obtained mixed fiber yarn tends to be excessive. Further, if the excess supply rate is less than 1%, it is impossible to increase the difference in yarn length from the rayon filament even if the temperature of the second drawing supply roller is increased, and there are few loops, and the covering effect by rayon is poor. In addition, when the excess supply rate exceeds 5%, it is possible to run the polyester drawn yarn stably by increasing the temperature of the second drawing supply roller, but even with the entanglement treatment, the rayon There is a lot of slack in the filament, and the second
The yarn breaks easily so that it wraps around the stretching supply roller. Therefore, the excess supply rate is preferably about 2 to 4%. When combining these undrawn polyester yarns and rayon filaments, further added value or rationality can be obtained by selecting a combination that is characteristic of each yarn. In other words, by using a different shrinkage mixed fiber yarn or a different cross-section yarn as the undrawn polyester fiber, it is possible to use a yarn with a different shrinkage or a different cross section, especially under conditions where there is little difference in yarn length from the rayon filament, or when making it into a fabric as a non-twisted yarn or a weakly twisted yarn. , bulkiness and gloss are further imparted. Furthermore, since these polyester fibers and rayon yarns use different dyes, a two-bath dyeing method is required, but if one or both fibers are undyed yarns, the subsequent dyeing step can be omitted. Furthermore, since polyester fibers have poor dyeability compared to cellulose fibers such as rayon, by adding 0.5 to 5% of fine colloidal silica to the polymer, it is possible to improve the dyeability of polyester fibers by adding 0.5 to 5% of fine colloidal silica to the polymer. Colors become more vivid due to surface plasma irradiation treatment. For example, a black formal fabric can be obtained by dyeing the polyester side black in combination with a black undyed rayon yarn. In this way, polyester undrawn yarn can be
By simply installing the entanglement treatment nozzle while drawing normally with a stage drawing machine, it is possible to mix rayon yarn stably and rationally, and the polyester drawn yarn is used as the core yarn, and the covering effect of the rayon yarn is moderate. It is possible to obtain a mixed fiber yarn with a heathered pattern. The present invention will be explained below with reference to Examples and Comparative Examples (conditions and results are summarized in Table 1). Examples 1 to 9 and Comparative Examples 1 to 3 In each case, a stretching machine equipped with a two-stage continuous stretching section was used, and a 50d/36f polyester unstretched filament and a 75d/30f rayon filament were used to stretch 1000 m. A final roller speed of /min and an entangling nozzle were installed between the second drawing roller, and interlacing was performed with an air pressure of 3.5 Kg/cm ² in both cases. In Comparative Example 1 to Example 2 in Table 1, the excess supply rate was fixed at 3%, and the temperature of the second stretching supply roller was changed to 70°C, 90°C, and 110°C. As a result, when the roller temperature is 70℃ (Comparative Example 1), the polyester drawn yarn has little shrinkage and the tension is relaxed, so it is easy to be entangled and each loop is easily generated, but there is less yarn length difference and rayon Covering effect is low. When the temperature was 90° C. or higher (Examples 1 and 2), the polyester drawn yarn began to shrink significantly, and large and small loops were generated from the small loops of rayon. Comparative Examples 2 to 3 in Table 1 are the results of fixing the second stage supply roller temperature at 110° C. and changing the excess supply rate. At an excess supply rate of -1% (Comparative Example 2), the tension is high and the integrity is poor, so there is no difference in yarn length between polyester and rayon, and the yarns separate from each other, resulting in poor winding shape and poor handling. lacking in sex. Moreover, when it reaches 7% (Comparative Example 3), the rayon filament sag is large and the tension on the polyester side is also reduced, making threading difficult and even if the thread is stiff, it will break immediately. In Examples 5 to 9 in Table 1, the type or combination of the undrawn polyester filament and the rayon filament was changed in accordance with the conditions of the present invention. Example 5 used a 50d/36f undrawn filament in which half of the fibers were mixed with 12 mol of isophthalic acid modified polymer, and the fabric, which was a lightly twisted fabric, was particularly bulky. Examples 6 and 7
These are the results when the cross section of the undrawn polyester filament is flat or square. In this case, a running pattern and glossy effect appear especially when it is made into a lightly twisted fabric, and in both cases you can feel the soft touch of rayon. Ta. Examples 8 and 9 are examples in which undyed yarns (purple and black, respectively) were used for rayon filament, and in Example 8, various hues and running patterns could be observed by dyeing the polyester side in any color. Ta. In addition, Example 9 is an example in which a black undyed filament of rayon and an undrawn polyester filament mixed with 2% colloidal silica are combined, and after weaving, an alkali weight loss treatment is performed and the polyester side is dyed black, thereby making it mild. A soft rayon touch fabric for black formal wear with a running pattern was obtained. In this way, in all of Examples 1 to 9, a running pattern or a marbling pattern can be expressed depending on the amount of twist added, and a soft and mild rayon touch fabric can be obtained by the appropriate covering effect of rayon. I was able to do that. 【table】

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a process in which the method of the invention can be carried out.

Claims (1)

[Claims] 1. When obtaining a composite mixed fiber yarn of polyester and rayon using a drawing machine equipped with a two-stage continuous drawing section,
First, the undrawn polyester filament is drawn in one stage, and then the rayon filament is guided to a two-stage drawing supply roller kept at 80°C or higher, and the rayon filament is wound on the two-stage drawing supply roller together with the polyester drawn yarn, from which 1 to 5% 1. A method for producing a composite mixed fiber yarn, characterized in that an entanglement treatment is performed using a pressurized fluid while an excess supply of . 2. The manufacturing method according to claim 1, wherein the undrawn polyester filament is a mixed yarn having different physical properties. 3. The manufacturing method according to claim 1, wherein the undrawn polyester filament is a yarn with an irregular cross section. 4. The manufacturing method according to claim 1, wherein the rayon filament is undyed yarn. 5. The manufacturing method according to claim 1, wherein the undrawn polyester filament has numerous irregularities on its fiber surface.