The present invention relates to a core yarn production system which enables to increase yarn quality by improving hairiness and unevenness values present in core yarns formed by combining core and winding fibers with the effect of electrical field with drawing characteristic in textile industry, and to obtain a compact yarn structure.

Background of the Invention Cored (kernel) yarn production in ring yarn machine: The filament in the core is fed by the pre-conveying cylinders during spinning process and placed in core part of the cord that is being drawn. The conveying cylinder enables the metal wire to be spun properly and to remain always in the core part. By this means, the filament in the core is continuously wound by the mantle fibers and remains in the inner side of the yarn. The spinning tension of the cord which is subjected to drawing exhibits a small amount of reduction when it is separated from the holding points of the exit cylinders. The filament in the core is wound by the staple fibers and placed in the core part of the yarn by means of twisting and winding processes.

The most important problem experienced in core yarn production is that the filament or staple fibers in the core cannot be covered completely by the winding fibers on the outer layer. This exposed areas in the core causes deformation in the yarn. This deformation is called barber-pole effect. For this reason, the negative effect on the yarn quality also reflects on the fabric. Especially it causes color differences, stains after dyeing. The reasons for not being able to cover the filaments in the core completely are not being able to center the filament in the core properly, the insufficient number of fibers in the section of the cord wound around the filament, and not being able to wind the rigid and fixed filament at the center by the fiber bundle regularly due to unavoidable incompatibility with the moving and fluid staple fibers.

United States Patent Document US20100148404, an application known in the state of the art, discloses a non-fiber spinning method and device. The objective of the invention is to provide a uniform nano-fiber yarn production having high productivity and strength by means of creating electric field utilizing high electrical potential differences. However, the electrical field in the said document is applied during placing winding winding fibers on the core yarn. Japanese Patent document no JP2006291398, an application known in the state of the art, discloses a twisted fiber yarn production method. In this invention, twisted fiber yarn in a uniform and homogenous structure is formed by means of the electrical field generated between the electrodes.

The Problems Solved with the Invention

The objective of the present invention is to provide a core yarn production system which enables the core yarn to be placed at the center of the winding fibers in elastane cored yarn production.

Another objective of the present invention is to provide a core yarn production system which enables to completely cover the core yarn by densifying the winding fibers wound around the core yarn and providing homogeneous distribution. A further objective of the present invention is to provide a core yarn production system which enables to decrease hairiness ratio in the yarn, minimize thin-thick are ratio, improves unevenness values such that the core yarn is prevented from being seen from the core yarn surface.

Another objective of the present invention is to provide a core yarn production system which enables to obtain a compact yarn structure by means of increasing drawing force between the inner and outer fibers, and to eliminate color differences in the yarn due to the difference in paint receiving ratios of the fibers especially occurring after dyeing.

Yet another objective of the present invention is to provide a core yarn production system which enables energy saving by eliminating absorption force used for compact yarn production which provides solution for barber-pole effect.

Detailed Description of the Invention

A core yarn production system developed to fulfill the objective of the present invention is illustrated in the accompanying figure, in which,

Figure 1 is the schematic view of the core yarn production system.

The components shown in the figures are each given reference numbers as follows:

1. Core yarn production system

2. First roller

3. Second roller

4. Slot

5. First planar electrode system

6. Second cylindrical electrode system 7. Cylinder

E. Core yarn

F. Winding fiber

A core yarn production system (1), which enables to increase yarn quality by improving hairiness and unevenness values present in core yarns formed by combining core yarn (E) and winding fibers (F), and to obtain a compact yarn structure, essentially comprises

- at least one first roller (2) on which the winding fibers (F) are wound,

at least one second roller (3) on which the core yarn (E) are wound, at least one slot (4) which is manufactured from ceramic material, on which the winding fibers (F) coming out of the first roller (2) extend,

at least one planar electrode system (5) which is positioned inside the slot (4), - at least one second cylindrical electrode system (6) between which the core yarn (E) coming out of the second roller (3) passes,

at least one cylinder (6) which enables the winding fiber (F) coming out of the first planar electrode system (5) and the core yarn coming out of the second cylindrical electrode system (6) to be connected to each other by drawing them by means of moving circularly.

In the inventive core yarn production system (1), there is provided a first roller (2) which is in form of a cylinder on which the winding fibers (F) are wound, and which can freely move around its own axis. Furthermore, there is provided a second roller (3) which is in form of a cylinder on which the winding core yarn

(E) is wound, and which can freely move around its own axis. The winding fiber

(F) wound on the first roller (2) moving freely around its own axis is drawn and sent inside the slot (4). In a preferred embodiment of the invention, winding fiber (F) is passed between two rectangular slots (4) manufactured from ceramic material and placed parallel to each other. The said two ceramic slots (4) placed on top of each other are connected by means of the connecting pieces. In a preferred embodiment of the invention, a hook system and/or a hinge is used for connecting the slots (4) to each other. The first planar electrode system (5) is placed inside the channels made on the inner surface of the slot (4). In a preferred embodiment of the invention, a first planar electrode system (5) is placed in each one of the slots (4), and the winding yarns (F) are passed between the first planar electrode systems (5). There is a cylinder (7) which draws the winding fiber (F) coming out of the first planar electrode system (5) and enables it to be separated from the first roller (2) by means of moving circularly. The core yarn (E) coming out of the second roller (3) passes between the second cylindrical electrode system (6), and there is a cylinder (7) which enables the core yarn (E) to separate from the second roller (4) by drawing it. The cylinder (7) enables the winding fiber (F) to be wound on the core yarn (E). By means of the core yarn (E) and the winding fiber (F) passing between the first planar electrode system (5) and the second cylindrical electrode system (6), the yarn core (E), in other words the elastane, is enabled to be placed at the center of the winding fibers (F).

Mechanical stresses occur in the dielectric materials due to the polarization of dielectrics in the electrical field. The mechanical forces generated in the dielectric material due to electrical field cause the said dielectric to be deformed. This phenomenon is called 'Electrostrictive effect'. With the electrical attraction between the core yarn (E) and the winding fibers (F) by using electrostrictive effect, the elastane is enabled to be coated with a homogenous distribution around the core yarn (E), in other words the compact elastane filament at the center. In order to create electrical field with drawing characteristic between the winding fibers (F) and the core yarn (E) in the exit cylinder (7) where the spinning triangle is formed; it is required to charge the winding fibers (F) in cord form with positive polarity by using the first planar electrode system (5), and to charge the core yarn € with negative polarity by using the second cylindrical electrode system (6). In this case, increase in yarn quality is provided by decreasing hairiness and unevenness ratio by means of coating the winding fibers (F) and the core yarn (E) more properly and providing a more compact yarn structure with the effect of electrical field with drawing characteristic generated between the winding fibers (F) and the core yarn (E) in the exit cylinder (7) where the spinning triangle is formed. A solution for barber-pole effect is provided by means of the inventive core yarn production system (1), absorption force used for compact yarn production is eliminated, and therefore energy saving is obtained.

The inventive core yarn production method (1) enables to decrease hairiness ratio in the yarn such that it will prevent the elastane from being seen on the yarn surface, minimize thin-thick area ratio, improve unevenness values, obtain a compact yarn structure by means of increasing attraction force between the outer and inner fibers, and eliminate color differences due to the difference in dye receiving ratio of the fibers especially occurring after dyeing.