JPS6040527B2 - Manufacturing method of composite yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for manufacturing composite yarn, and more specifically, the present invention relates to a method for manufacturing a novel composite yarn, and more specifically, a loop group of filament yarn mainly made of thermoplastic synthetic fibers is formed into a core by using a negative pressure swirling vortex flow. The loops are entangled in a twisted state around the circumferential surface of the yarn, and then the loops are heated and fixed to produce a spun yarn-like composite yarn that has a bulky, beautiful luster, and a firm and flexible texture. It relates to a manufacturing method.

Conventionally, in order to obtain a composite yarn consisting of a core and a saddle, a method using a so-called Ring Karo twisting mechanism, such as a loom or a twisting machine, has been used, but in principle, this method has low productivity. However, when a filament yarn is used in the saddle portion, only a monotonous filament covering yarn or loop yarn can be obtained.

Recently, so-called spunlike processing, which mainly targets filament yarns and produces spun yarn-like yarns from filament yarns by using fluids and other effects, has improved productivity and produced new yarn forms. Various methods have been proposed for this purpose, but the conventional spunlike processing methods lack bulkiness, and the biggest drawback is that the fibers forming the yarn cannot be ring-twisted. The twisting effect cannot be applied without twisting, and therefore the fibers on the surface of the yarn processed to be untwisted are squeezed in subsequent processes such as tube winding, weaving, knitting and weaving, resulting in neps, etc. The point is that it is easy. In addition, since it is not twisted, it has the essential drawback that only a so-called paper-like texture can be obtained, which lacks elasticity, bulk, and properties. The present inventors have discovered that the desired objective can be achieved by utilizing a negative pressure swirling vortex flow, and as a result of further intensive study, the present invention has been achieved. The gist of this is that the core yarn is run through a cylinder that is brought into a negative pressure state by suction, and the sheath filament yarn is passed through an air inflow hole provided in the tangential direction of the periphery of the cylinder. When forming a composite thread by supplying excess thread, a saddle filament thread mainly made of thermoplastic synthetic fiber is supplied so as to be located in the conical part of the hollow cone provided in the cylindrical body. At the tip, by the action of a negative pressure swirling vortex flow, the excessively supplied sheath filament yarn is formed around the core yarn running inside the hollow cone to form a loop group, and at the same time, the loops are entangled in a twisted state. The present invention provides a method for producing a composite yarn, which is then heat-fixed.

According to the present invention, in addition to the luster of the filament yarn, a bulky and stiff product can be obtained because of the loops in a twisted state, and moreover, the loops forming the neck are in a twisted state. Because it is heat-set, it is possible to obtain a composite yarn with excellent morphological stability, which does not cause neps when squeezed in subsequent processes such as winding, knitting, and weaving. Since the negative pressure swirling vortex of the yarn is effectively utilized, there is no mechanical wear and tear, and a novel composite yarn manufacturing method is provided that can economically and highly productively obtain the desired composite yarn. .

Next, the present invention will be explained in detail using illustrated examples.

FIG. 1 is a perspective view showing an example of a state in which a composite yarn is manufactured by carrying out the present invention, in which the core forming yarn 2 unbroiled from the yarn supplying body 1 is passed through a yarn guide 3 and tension adjusted. It travels along the central axis of the swirling vortex tube 12 through the yarn introduction hole 5 of the swirling tube 12 which is connected to the device 4 and the negative pressure source 13 . On the other hand, the sheath-forming yarn 7, which is separately scaled from the yarn supplying body 6, passes through a yarn guide 8, a traverse guide 9, and a delivery roller 10, and is directed in the tangential direction of the inner wall surface of the swirling swirl tube 12. The air is supplied into the swirling vortex cylinder 12 through the air inflow hole 11 provided. The core-forming yarn 2 and sheath-forming yarn 7 thus supplied into the swirling vortex tube 12 are twisted and entangled by the action of the negative pressure swirling vortex to form a composite yarn 14, After passing through the extraction hole 15, it is heated and fixed by a heating device 17 installed between the swirling vortex tube 12 and a winding device 16, and is rolled up as cheese 20 by the winding device 16. Therefore, to explain the formation of the composite yarn 14, FIG. 2A and 2B respectively illustrate a longitudinal sectional side view and a cross sectional view of the swirling vortex tube 12 in FIG. 1.
Since the negative pressure swirling vortex is the most important element in carrying out the present invention, an example of this generating means will be explained first.The swirling vortex tube 12 illustrated in FIG. By creating a pressure state, air flows into the swirling vortex tube 12 from the air inlet hole 11 provided in the tangential direction of the inner wall surface, thereby generating a swirling vortex flow.

Therefore, to explain the formation situation of the composite yarn 14 with reference to FIG. 2, the sheath forming yarn 7 is guided by the suction airflow from the air inflow hole 11, and has a numerical value compared to the core forming yarn 2. Since the excess supply is carried out and enters the swirling vortex tube 12, sagging occurs in the swirling vortex tube 12, and in addition, a loop 21 is continuously generated due to the negative pressure swirling vortex effect. Therefore, these loop groups are further transformed into the swirling vortex tube 1 by the action of the negative pressure swirling vortex flow.
The tip 18 of a hollow cone 19 provided at the center of the hollow cone 19 is continuously entangled in a twisted state around the core forming yarn 2 to form a composite yarn 14, which is then heated through the extraction hole 15. In the fixing step, it is guided to a heating device 17 such as a hot plate, heated and fixed, and then taken out. At this time, since the tip of the hollow cone 19 has a conical shape, the vortex in the swirling vortex tube 12 is stabilized to produce a spiral movement toward the tip of the hollow cone 19, and the generated sheath It has the effect of smoothly transferring the loop of the thread 7 for forming the sheath part to the tip of the hollow cone 19, and facilitates twisting of the loop group of the thread 7 for forming the sheath part to the thread 2 for forming the core part. do. As described above, in the present invention, by overfeeding the sheath-forming yarn 7 compared to the core-forming yarn 2, the loop group is formed by creating slack and by the negative pressure swirling vortex action. The excess supply ratio in this case can be appropriately selected in relation to the desired loop formation, but is preferably twice (2
00%) or more, more preferably 5 times or more,
In the examples described later, results obtained using an excess supply ratio selected within the range of 5 to 1 are exemplified.

To further explain the formation of composite yarns, FIG.
A cross-sectional view showing another example of the swirling vortex tube 12 in the figure,
This is an example of a swirling vortex tube in which a plurality of yarns 7 for forming a sheath portion are supplied at the same time.

By supplying a plurality of sheath-forming yarns 7 in this way, a more even external shape can be obtained. Next, heat fixation, which is important in carrying out the present invention, will be explained.

As described in detail above, the thread 7 for forming the tuna part is entangled with the circumferential surface of the thread 2 for forming the core part in a twisted state by a negative pressure swirling vortex action.

Therefore, the stability of the entangled state is basically determined by the suction negative pressure value in the swirling vortex tube 12 after selecting the type of yarns forming the sheath portion and the core portion and the excess supply ratio. This is possible by adjusting the twisting action of the negative pressure swirling vortex flow, or by adjusting the winding speed and other equipment conditions. As a result of various studies, it has been found that in the present invention, it is important to immediately heat and fix the composite yarn 14 pulled out through the pull-out hole 15 using a heating device 17 such as a hot plate. That is, by providing the heating device 17 in this way, productivity is further improved and the range of manufacturing conditions is expanded, so that composite yarns with a variety of external appearances and excellent post-processing stability can be obtained. It is possible. Here, the heat fixing temperature may be appropriately selected depending on the desired external appearance of the composite yarn, taking into consideration the type of fiber, winding speed, etc., but preferably, the temperature is higher than the secondary transition point of the fiber used, It is best to select within the effective temperature range below the softening point. As described above, since heat fixation is performed in the method of the present invention, it is necessary that at least the saddle-forming thread be a thread mainly composed of thermoplastic fibers. In addition, in carrying out the process, a thread made of thermoplastic fiber can be used simultaneously as the thread for forming the saddle part and the core part, and furthermore, a heat-shrinkable fiber can be used as the thread for forming the sheath part and the core part, or at the same time. You can also create special effects. In addition, in the present invention, in addition to the above-mentioned balanced spun yarn adjustment yarns, it is also possible to create slab adjustment yarns and naps by intermittently changing the excess supply ratio of the core forming yarn and the sheath forming yarn. It is also possible to obtain composite yarns having a wide variety of appearances, such as adjusted yarns.

Thus, according to the present invention, as illustrated in FIG. 4, a novel yarn-like spun yarn having a bulky and elegant luster, in which a group of loops is tightly coated and heat-fixed in a twisted state around a core-forming yarn, is produced. Composite yarns can be produced economically and with high productivity. The present invention has the above configuration, and according to the present invention, in addition to the luster of the filament yarn, a bulky and stiff product can be obtained due to the loop group in a twisted state, and furthermore, a product with bulk and stiffness can be obtained. Because the composite yarn is heat-fixed, yarn with excellent shape stability can be obtained in post-processing processes such as tube winding, weaving, and weaving, and it also makes effective use of the high-speed negative pressure swirling vortex generated by suction. Therefore, there is no mechanical wear and tear, and the desired composite yarn can be obtained economically and with high productivity.

EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

Example 1 The device shown in Fig. 1 was used (the swirl tube 12 shown in Fig. 2 was used), and the core forming thread 2 was made of polyester filament thread 15M/3m. The tension of the composite yarn 14 was set at 80 h/min using the tension adjustment device 4, the winding speed of the composite yarn 14 was set at 8 h/min, the negative pressure in the swirling vortex tube 12 by the negative pressure source 13 was set at 2000 h/min, and the sheath was set at 80 h/min. Section forming thread 7
A polyester filament yarn of 5W/48 was used for the composite yarn, and the yarn was fed into the swirling vortex tube 12 through a delivery roller 10 at a speed of 448 m/min, and the other main conditions were set as shown in Table 1. When the yarn was manufactured, it was found that the yarn formation was continuous and stable, and a well-balanced composite yarn with fine loops appearing in a fluff-like appearance and excellent shape stability and spun yarn appearance was obtained. It was done.

・-Next, polyester filament yarn 7 phantom/3 matrix for the warp,
When the weft was woven into a plain weave using the above-mentioned composite yarn, and finished with a warp density of 50 threads/2.54 arcs and a striped thread density of 45 threads/2.54 threads, the result was a high volume, elegant luster and waist. A woven fabric with a certain excellent feel was obtained, and the weavability was also extremely good.

Example 2 A composite yarn was manufactured using the apparatus shown in Fig. 1 (the swirling vortex tube 12 shown in Fig. 2 was used) and the main conditions were set as shown in Table 2. .

Table 2 Note that the yarn formation in this case was carried out continuously and with good stability, and the desired composite yarn was obtained.

Next, when this composite yarn was used as a knitting yarn and knitted into a flat weave using 10 gauge, a striped fabric with a firm texture, rich luster and bulkiness, and an excellent appearance was obtained. There were very few thread breakages and knitting habits, and the knitting properties were good.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a state in which a composite yarn is manufactured by implementing the present invention, Fig. 2 A shows an example of the swirling vortex tube in Fig. 1; 3 is a cross-sectional view showing another example of the swirling vortex tube in FIG. 1; FIG. 4 is a cross-sectional view showing an example of the composite yarn obtained by the present invention. It is an external view. In the figure, 2 is a thread for forming the core part, 7 is a thread for forming a sheath part, 10 is a delivery roller, 11 is an air inflow hole, 12 is a swirling swirl cylinder, 13 is a negative pressure source, and 14 is a composite thread. 17 is a heating device, 19 is a cone, and 21 is a loop. Figure 3 Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] 1. A core yarn is run through a cylindrical body that is brought into a negative pressure state by suction, and an excessive amount of sheath filament yarn is supplied from an air inflow hole provided in the tangential direction of the periphery of the cylindrical body to form a composite yarn. When forming the sheath, the filament yarn for the sheath made mainly of thermoplastic synthetic fibers is supplied so as to be located in the conical part of the hollow cone provided inside the cylinder, and the action of a negative pressure swirling vortex flow is applied at the tip of the hollow cone. The sheath filament yarn excessively supplied around the core yarn running inside the hollow cone forms a loop group, and at the same time, the loops are entangled in a twisted state, and then heated and fixed. A method for manufacturing composite yarn.