JP2009144285A - Method for producing spun yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost method for producing a spun yarn having moderately laid fluffs and resistant to the rise of fluffs even after passing the subsequent processes. <P>SOLUTION: The spun yarn is produced by twisting a fiber strand spun from a front roller. In the production method, an auxiliary roller is placed in parallel with the front roller between the front rollers and a snell wire, the auxiliary roller is rotated reverse to a front bottom roller, the angle between a vertical line drawn from the nip point of the fiber strand on the front roller to the auxiliary roller and the spinning direction of the fiber strand is set at 20-60°, and the fiber strand is guided to the snell wire while bringing the strand into contact with the surface of the auxiliary roller. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing spun yarn. More specifically, the present invention relates to a method for producing spun yarn with less fuzz by a ring spinning machine or the like.

  In general, spun yarn has fluff on the surface, and fluff greatly contributes to improving the texture of the fabric. However, since the spun yarn has fluff, naturally, the fabric made thereof also has fluff on the surface. As a result, as the number of times the fabric is used increases, pilling or the like gradually occurs on the surface.

  Therefore, as means for reducing the fluff to such an extent that the texture of the fabric is not impaired, means for burning and removing the fluff on the surface of the fabric with a flame of a gas burner is widely adopted. However, since the flame of the gas burner can easily burn other than the fluff, considerable skill is required to obtain the desired effect. Therefore, creation of an alternative technology was desired.

  In recent years, a compact spinning system has been proposed as such an alternative. This is a means for reducing fluff from the viewpoint of spinning, and is a means for reducing fluff on the surface of the spun yarn by adopting an air suction type fiber bundle converging mechanism. As an evaluation of this means, it is common to evaluate that the obtained spun yarn is effective as an alternative means since it contributes not only to reducing the fluff on the fabric surface but also to improving the strength and glossiness of the fabric. However, since the system is expensive and consumes a lot of air during air suction, the running cost is high, and the reduction of the manufacturing cost remains as a problem.

In view of this, there has been disclosed a means for spinning by attaching a fluff binding tool having a specific shape to the downstream side of the front roller of the ring spinning machine (see, for example, Patent Document 1).
JP 2005-133273 A

  The above spinning means can be easily carried out simply by attaching a fluff binding tool having a simple structure, which is advantageous in terms of reducing manufacturing costs. However, this means is a relatively simple means of twisting the fluff along the swelled curved surface on the surface of the fluff binding tool, and the fluff is only hung along the spun yarn body. However, there remains a problem that the spun yarn is easily fuzzed by rubbing the spun yarn in the subsequent textile preparation process and weaving process.

  The present invention eliminates the disadvantages of the prior art as described above, and provides a method for producing a spun yarn that is moderately fluffed and that is less likely to fluff even after a subsequent process at a low cost. It is intended.

  As a result of earnest research, the present inventor has provided an auxiliary roller between the front roller and the snell wire, and introduced the fiber bundle obliquely into the auxiliary roller. The inventor has reached the present invention by knowing that he can lie down.

  That is, the present invention provides a method for obtaining a spun yarn by twisting a fiber bundle spun from a front roller, and an auxiliary roller is provided in parallel with the front roller between the front roller and the snell wire. Rotate in the opposite direction to the front bottom roller, and set the angle between the perpendicular direction lowered from the nip point of the fiber bundle toward the auxiliary roller on the front roller and the spinning direction of the fiber bundle to 20 ° to 60 ° Then, the gist of the method for producing a spun yarn is characterized in that the fiber bundle is guided to the snell wire while being in contact with the surface of the auxiliary roller.

  According to the present invention, it is possible to efficiently and inexpensively produce a spun yarn that is moderately fluffed and is less likely to fluff even after a subsequent process.

  Hereinafter, the present invention will be described in detail.

  The present invention is a method for obtaining a spun yarn by newly introducing an auxiliary roller into a known spinning machine such as a ring spinning machine.

  FIG. 1 is a schematic diagram showing an example of a main part in the production method of the present invention. Specifically, the outline until the fiber bundle 1 introduced into the back roller 2 is wound up as the spun yarn 9 via the auxiliary roller 5 is illustrated.

  As means for introducing the fiber bundle 1 into the front roller 4, a known method can be applied mutatis mutandis. That is, as shown in FIG. 1, first, a means for introducing a fiber bundle 1 such as a roving yarn into a back roller 2 in a ring spinning machine and sequentially introducing it into an apron 3 and a front roller 4 while drafting can be employed.

  As shown in FIG. 1, the front roller 4 is composed of two rollers, a front top roller 4a and a front bottom roller 4b. The fiber bundle 1 is spun while being sandwiched between both rollers that rotate in contact with each other. In the present invention, a point where the fiber bundle 1 is sandwiched between both rollers is referred to as a nip point.

  In the normal spinning method, after spinning the fiber bundle, the fiber bundle is guided to the snell wire without any rollers and guides. In the present invention, the fiber bundle is interposed between the front roller 4 and the snell wire 6. An auxiliary roller 5 is provided. In the present invention, by bringing the fiber bundle 1 into contact with the surface of the auxiliary roller 5, the fluff on the surface of the fiber bundle 1 is turned down.

  After bringing the fiber bundle into contact with the surface of the auxiliary roller, the fiber bundle is guided to the snell wire 6, and then the traveler 7 is slid and rotated on the ring 8 to twist the fiber bundle, as in the normal spinning method. At this time, since the twist propagates to the upstream side beyond the snell wire, in the present invention, the propagation of this twist is also used for fluff binding. That is, by utilizing the propagation of twist, the fiber bundle can be rotated without changing the position on the surface of the auxiliary roller, so that the entire surface of the fiber bundle can be brought into contact with the surface of the auxiliary roller.

  The main technical idea of the present invention is to lie down the fluff on the surface of the fiber bundle by using the auxiliary roller as described above, and the following three points are given as important points in the implementation.

  That is, as the first point, in the present invention, the auxiliary roller is installed in parallel with the front roller. This is because the auxiliary roller cannot be installed in a direction other than the horizontal direction with respect to the front roller due to the structure of the spinning machine.

  And as a 2nd point, an auxiliary roller rotates in a reverse direction with respect to a front bottom roller. This is because if the rotation direction of the auxiliary roller is the same direction as the front roller, in addition to reducing the fluffing effect on the fiber bundle, the fiber bundle is actively sent to the subsequent process, resulting in the fiber bundle. This is because the tension to be applied is reduced, and as a result, twisting unevenness may occur.

  In FIG. 1, the auxiliary roller 5 and the front bottom roller 4b are rotated in contact with each other. By arranging the auxiliary roller 5 in this way, the rotation of the auxiliary roller 5 becomes passive, and the place contributing to the reduction of the running cost is increased. Of course, the present invention is not limited to the mode of rotating both rollers in contact with each other as shown in FIG. 1, but also includes the mode of positively rotating the auxiliary roller. The auxiliary roller can be installed at a certain distance from the bottom roller.

  Furthermore, as a third point, in the present invention, when the fiber bundle is introduced into the auxiliary roller, it is introduced obliquely with respect to the roller so as to form a specific angle with the vertical direction instead of the vertical direction. Specifically, the angle A formed by the perpendicular direction lowered from the nip point of the fiber bundle toward the auxiliary roller and the spinning direction of the fiber bundle is set to 20 ° to 60 °. This is because if the numerical value is not exceeded, the fluff cannot be tightly twisted on or inside the spun yarn.

  In the present invention, the desired effect can be basically obtained if the above configuration is satisfied, but in order to further promote fluffing, the surface material of the auxiliary roller, the rotation speed, the contact length of the fiber bundle in the auxiliary roller, etc. It is preferable to use a predetermined one.

  That is, as the surface material of the auxiliary roller, basically any material that does not interfere with the fluffing of the fiber bundle can be adopted, for example, rubber, metal, ceramic, etc. In consideration of the dynamic friction force of the spun yarn, rubber is preferably used. The dynamic friction force of the spun yarn against the auxiliary roller surface material is preferably in the range of 20.0 to 40.0 cN. When the dynamic friction force is less than 20.0 cN, the fluff of the fiber bundle tends to be difficult to bend. On the other hand, when it exceeds 40.0 cN, twisted yarn and uneven thickness may occur in the spun yarn. .

  A commercially available tensile tester is used for measuring the dynamic friction force. Specifically, “Autograph AG-1000 (trade name)” manufactured by Shimadzu Corporation is used as a tensile tester, and a target roller is installed and fixed between upper and lower gripping jigs in the tester. Next, one end of the spun yarn is gripped by the upper holding jig, the spun yarn is wound around the roller once, and then a load of 4.9 cN is applied to the other end of the spun yarn. Then, the upper holding jig is raised at a test speed of 50 mm / min, and the stress applied to the spun yarn is measured. At this time, using the data processing software connected to the testing machine, the stress is displayed in a graph and the dynamic friction force is calculated. In the graph, a curve with a strong peak corresponding to the static friction force is displayed first, and then a curve corresponding to the dynamic friction force that is substantially parallel to the horizontal axis and slightly undulate is displayed. The target dynamic friction force is calculated by averaging the curve corresponding to the force.

  Further, the rotation speed of the auxiliary roller is not particularly limited, but is preferably set to 10 to 150%, more preferably 25 to 100% with respect to the rotation speed of the front roller. When the rotation speed of the auxiliary roller is less than 10% with respect to the rotation speed of the front roller, the fluff of the fiber bundle tends to be difficult to bend, while when it exceeds 150%, unevenness of the twist or thickness of the spun yarn is generated. In some cases, both are not preferred.

  Further, the contact length of the fiber bundle in the auxiliary roller is not particularly limited as long as it does not interfere with fluff binding, but is generally preferably 5 to 30 mm, and more preferably 10 to 25 mm. If the contact length of the fiber bundle is less than 5 mm, the fluff of the fiber bundle tends to be difficult to bend, whereas if it exceeds 30 mm, twisted yarns and thickness unevenness may occur in the spun yarn, which is not preferable.

  In the present invention, there are also preferable conditions in addition to the essential conditions for fluffing the fiber bundle. However, as a matter of fact, as long as the fiber bundle is brought into contact with the surface of the auxiliary roller, fluffing itself is possible to some extent. Of course, fluffing itself is possible even under conditions that deviate from the above numerical limitations, and the spun yarn obtained under such conditions also appears fluffy. However, since such spun yarn is not tightly twisted into the spun yarn, there is a problem that the spun yarn becomes fuzzy in the subsequent fabric preparation process or weaving process.

  On the other hand, in the present invention, since the fiber bundle is introduced obliquely with a specific angle with respect to the auxiliary roller, the fluffed fluff comes to make a specific angle with respect to the longitudinal direction of the fiber bundle. Thereby, the spun yarn obtained by the method of the present invention is strongly fluffed.

  In the present invention, as described above, after bringing the fiber bundle into contact with the surface of the auxiliary roller, the fiber bundle is guided to the snell wire and twisted. As a twisting coefficient at the time of this twisting, 2.0-7.0 are preferable, and as a twisting direction, both S and Z are employable.

  Furthermore, in the present invention, the fluffing of the spun yarn may be further promoted by adjusting the twisting conditions according to the fluffing of the fiber bundle. For example, in the case of FIG. 1, the fiber bundle is first fluffed in the Z direction by passing through an auxiliary roller. Thereafter, the fiber bundle is introduced into the twisted region via the snell wire. If the twist is in the Z direction, the fluffing direction in the fiber bundle and the fibers constituting the spun yarn are in the twisted state. If the twist is in the S direction, the two directions are opposite to each other.

  In this case, in the present invention, any aspect can be basically adopted, but it is preferable to adopt the former from the viewpoint of fluff binding. Furthermore, the relationship between the angle of the fluffed fluff with respect to the longitudinal direction of the fiber bundle and the twisted angle of the spun yarn is not particularly limited in the present invention, but it is preferable to set both to be equal from the point of fluffing. . Although these reasons are not certain, it is considered that there is some causal relationship between fluffing and twisting of the fiber bundle.

  As described above, the present invention is an unprecedented excellent spinning method, and applicable fibers may be any material as long as they are short fibers, for example, natural fibers such as cotton and wool, Recycled fibers and synthetic fibers can be applied.

  Next, an example explains the present invention.

  In order to evaluate the fluff binding of the spun yarn, the average fluff index of the spun yarn was measured according to JIS L1095 9.22.2B method. Specifically, a perpendicular light beam in one direction is applied to the spun yarn, and an image of the fluff is projected on a shielding plate installed on the side opposite to the light source when viewed from the spun yarn, and the projected fluff of 3 mm or more and 5 mm or more Number was measured. For measurement, an F-INDEX tester (manufactured by Shikishima Boseki Co., Ltd.) was used 30 times under the conditions of a sample length of 10 m and a yarn speed of 30 m / min, and the average value was used as the average fluff index.

Example 1
A cotton fiber having an average fiber length of 29 mm and an average single yarn fineness of 1.42 dtex and a polyester fiber having an average fiber length of 32 mm and an average single yarn fineness of 1.45 dtex are prepared. Thus, two slivers having thicknesses of 4.9 g / m and 2.1 g / m were obtained.

  Then, the two obtained slivers were simultaneously supplied to the roving machine, and the core / sheath mass ratio 30/70, the thickness 0.83 g / m, with the cotton fibers in the sheath and the polyester fibers in the core, A roving with a twist coefficient of 0.85 was obtained.

  Next, this roving was supplied to a ring spinning machine having the structure shown in FIG. In this ring spinning machine, as shown in the figure, since the auxiliary roller 5 is rotated in contact with the front bottom roller 4b, the auxiliary roller 5 is necessarily arranged in parallel with the roller 4b and at the same time as the roller 4b. Rotates in reverse direction at speed. The diameter of the auxiliary roller 5 was 27.5 mm, and rubber was used as the surface material of the roller.

  As spinning, first, the roving yarn obtained at a predetermined position in the ring spinning machine is installed, and the roving yarn is passed through the back roller 2, the apron 3, and the front roller 4 in order to increase the roving yarn by 29.7 times. Draft with. Subsequently, the fiber bundle 1 spun from the front roller 4 was introduced obliquely with respect to the auxiliary roller 5 so as to fluff in the Z direction. That is, the angle A formed by the perpendicular direction lowered from the nip point of the fiber bundle 1 toward the auxiliary roller 5 and the spinning direction of the fiber bundle 1 is set to 34 °, and the contact length of the fiber bundle 1 on the auxiliary roller 5 The fiber bundle 1 was introduced into the roller 5 so that the length was 20 mm.

  And the fiber bundle 1 which let the auxiliary roller 5 pass was led to the snell wire continuously, and was twisted by the twist coefficient 4.9 in the Z direction. Specifically, the fiber bundle 1 introduced from the snell wire was twisted while being wound around a bobbin as a target spun yarn 9 while being introduced into a traveler 7 that slidably rotated on a ring 8.

  The obtained spun yarn had a thickness of 20 (English cotton count) and had an average fluff index of 17.8 fluffs of 3 mm or more and 1.5 fluffs of 5 mm or more. Furthermore, the dynamic friction force of the spun yarn against the auxiliary roller surface material was measured and found to be 28.0 cN.

(Example 2)
A spun yarn having a thickness of 20 (English cotton count) was obtained in the same manner as in Example 1 except that the twisting direction of the fiber bundle was changed to the S direction instead of the Z direction.

  The obtained spun yarn had an average fluff index of 18.9 fluffs of 3 mm or more and 2.1 fluffs of 5 mm or more.

(Comparative Example 1)
The roving yarn used in Example 1 was supplied from the ring spinning machine in FIG. 1 to the spinning machine without the auxiliary roller, and drafted in the same manner as in Example 1. Subsequently, a fiber bundle was spun in the vertical direction from the front roller to the same roller, and then the fiber bundle was guided to a snell wire as it was and twisted under the same conditions as in Example 1 to obtain a spun yarn.

  The spun yarn obtained had a thickness of 20 (English cotton count), and the average fluff index was 102.0 fluffs of 3 mm or more and 12.5 fluffs of 5 mm or more.

(Comparative Example 2)
A spun yarn having a thickness of 20 (English cotton count) was obtained in the same manner as in Example 1 except that the angle A was changed to 18 ° instead of 34 °.

  The obtained spun yarn had an average fluff index of 57.0 fluffs of 3 mm or more and 6.0 fluffs of 5 mm or more.

(Comparative Example 3)
A spun yarn having a thickness of 20 (English cotton count) was obtained in the same manner as in Example 1 except that the angle A was changed to 62 ° instead of 34 °.

  The obtained spun yarn had an average fluff index of 36.8 fluffs of 3 mm or more and 5.8 fluffs of 5 mm or more.

It is a schematic diagram which shows an example of the principal part in the manufacturing method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber bundle 2 Back roller 3 Apron 4 Front roller 4a Front top roller 4b Front bottom roller 5 Auxiliary roller 6 Snell wire 7 Traveler 8 Ring 9 Spinning yarn A A perpendicular drawn from the nip point of the fiber bundle in the front roller toward the auxiliary roller Angle between the direction and the spinning direction of the fiber bundle

Claims (1)

In the method of obtaining a spun yarn by twisting the fiber bundle spun from the front roller, an auxiliary roller is provided in parallel with the front roller between the front roller and the snell wire, and the auxiliary roller is opposite to the front bottom roller. And the angle formed by the perpendicular direction drawn from the nip point of the fiber bundle in the front roller toward the auxiliary roller and the spinning direction of the fiber bundle is set to 20 ° to 60 °, and the auxiliary roller A method for producing a spun yarn, wherein the fiber bundle is guided to a snell wire while being in contact with the surface of the spun yarn.