JPS6015728B2 - Manufacturing method of spun yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for obtaining spun yarn using a ring spinning method.
This invention relates to a method for highly efficiently producing a soft spun yarn with good spinnability and sufficient practical performance with a gentle twist that could not be produced by conventional weaving.

Various methods have been invented and put into practical use to obtain spun yarn by arranging relatively short stable fibers such as cotton and wool in a certain direction and concentrating them with rattan. It has provided essential clothing for human life and has helped form the foundation of a rich cultural life.

Among these, the ring fine loom was superior to any conventional pulp spinning machine in terms of its compactness, ease of operation, and high yarn quality, so it overtook other pulp spinning machines and replaced it with the horizontal spinning machine. In other words, it has become so popular that it refers to ring spinning machines. However, even though the Ring finesse machine was initially innovative, as time passed, its low productivity could no longer be covered up. Although various improvements have been made since then, a high number of twists is required in order to obtain the desired performance as a yarn with only actual twisting. Furthermore, the fatal disadvantage that the number of twists is determined by the rotation of the winding package has not been solved. In response to this, the open-end spinning method has been developed in recent years, and with a new idea, it has been possible to significantly speed up the fine bottle process that used to involve ring twisting.However, the application of this method also depends on its twisting mechanism. Due to the typical yarn structure, pongee yarn is limited to a relatively thick yarn count of 4 or less, and in the field of pongee yarn with a yarn count of 4 or less, low-speed winding horizontal paper machines still dominate.

In addition, as a result of applying a nozzle, the paper stacking method enables a dramatic increase in speed, and there are few restrictions on the yarn count to be manufactured. In addition to constraints on manufacturing conditions such as the need to use stable fibers with extremely long cut lengths, there is also the disadvantage that the resulting fabric is stiff due to non-twisting, and the binding spinning method is still widely used. It has not yet reached the stage where it can be developed. In view of these circumstances, the present inventors have made efforts to solve the problems of the bundled spinning method and have investigated a technology that can be applied to natural fibers with relatively short fiber lengths such as wire and wool, and as a result they have developed the present invention. Reached. That is, in the present invention, the fibers are stretched, and then subjected to false twisting by twisting and untwisting using a swirling fluid flow, and then continuously twisted with a twisting index of 1 or less by untwisting the false twisting. A method for producing a spun yarn characterized by winding the yarn in the same direction as the yarn, and at least one
The fibers drawn together with real filament yarns or processed yarns are subjected to Kato and untwisting false twisting by swirling fluid flow, and then the actual twist with a twist index of 12 or less is continuously applied to the direction of untwisting of the false twisting. This method of producing spun yarn is characterized by winding the yarn while adding it in the same direction as the yarn. However, the twist index refers to Nostable's average fiber length (ribs) x twist coefficient (English formula). The yarn obtained by the method of the present invention has a structure in which short fibers are wrapped around a bundle of fibers with real lacquer, and has sufficient practical performance in handling in subsequent processes. Because the fabric is thin and gently twisted, the resulting fabric is bulky, soft to the touch, and has no looseness and is of excellent quality. The present invention will be described in detail below with reference to the drawings, but the drawings are for illustration only, and the invention is not limited thereto, and modifications may be freely made without departing from the spirit of the invention. 1st
The figure is a schematic side view of a manufacturing apparatus suitable for carrying out the present invention.

The fibers (for example, short fiber stable rovings 2) that have been derusted from a package 1 of an appropriate shape are drafted to a predetermined thickness by a normal drafting device A that includes a back roller 3, an apron device 4, and a front roller 5. The fibers become parallel and are continuously pulled out from the front roller 5. This drawn fiber east is transferred to the front roller 5
When the yarn passes through the nip line, it is sucked and turned by a nozzle 6 placed immediately after the front roller 5, takes a twisted form, and then decombustes and is given a forward thrust and becomes a bundled yarn 7. After passing through a delivery roller 8, the finished yarn 101 is wound onto a bobbin 11 by a twisting ring-type yarn twisting machine, passing through a snell wire 9 while being given a twist index of 12 or less in the same direction as the untwisting direction. Here, raw materials for the fiber bundles supplied to the drafting device A include natural fibers, synthetic fibers, recycled fibers, semi-synthetic fibers, etc. alone or in combination, such as fiber materials used for clothing. Anything with a finite length can be used without restriction.

The form in which they are supplied to the drafting device A may be anything that can be drafted by the difference in surface speed between at least two sets of nip rollers, such as a thick unlacquered sliver or a lightly twisted thin roving. .

However, it goes without saying that the configuration of the draft device should be selected appropriately depending on various factors such as the type of fed material, cut length, and thickness at the time of supply. FIG. 5 is a schematic side view of an apparatus for producing core yarn by scaling filament yarn or processed yarn from a package 15, passing through a guide 17, and supplying it upstream of the front roller 5. Corean is manufactured. FIG. 6 is a schematic side view of a device that passes filament yarn or textured yarn through a weaving device 18, opens it, and supplies it to the front roller 5, thereby producing a soft, slightly twisted composite yarn. By providing a suitable guide or collector to slightly refract the flow of the fiber east being drafted between the draft rollers, the thickness distribution in the middle direction of the fiber east at the nip line of the front roller 5 is adjusted as shown in Figure 2. By making the fibers asymmetrical with respect to the central axis B of the center and joining the nozzle 6 provided immediately after the front roller 5, the binding effect of the outer peripheral fibers is increased through the false twisting effect caused by the swirling fluid flow. Provides favorable runnability and yarn quality. As nozzle 6,
The entrance part of the yarn has a fan-shaped expansion to collect the stretched fiber east, and the fluid injection hole eccentrically permeates the yarn path of an appropriate thickness following it and exhausts it. It is sufficient if the movement is carried out primarily in the same direction as the thread travels. However, as shown in FIGS. 3 and 4, a constriction part 13 having the diameter of a pongee is provided in the upstream portion of the yarn passage 14 close to the fluid injection hole 12 for constricting the yarn passage, and the constriction part 13 is connected to the fluid injection hole 12. The one in which the shaft is eccentric toward the opposite surface that connects to the thread passage 14 is particularly preferable because it has excellent turning force and stability. The delivery roller 8 rotates at a circumferential speed slightly slower than the front roller 5, and keeps the bundled yarn 7 subjected to the false twisting action by the nozzle 6 in a relaxed state where it is easily combusted. 5, it has a twist stopping function to prevent the false twisting action of the nozzle 6 and prevent yarn breakage. Therefore, it is necessary to have a structure that can control the running and rotation of the bundled yarn 7. In addition to the usual nip roller type, a single roller capable of nipping the yarn as shown in FIG. 1 is used. Here, the overfeed rate between the front roller 5 and the delivery roller 8 (if the peripheral speeds of the front roller and the delivery roller are VF and Vo, respectively, is 23 and X・o
If it is too small, the twisting force of the machine nozzle 6 will be reduced, which will impede the binding effect and cause yarn breakage.If it is too large, the yarn will become slack, causing snarls or balloon I don't like either of them because they can break. Therefore 0.5-3
It is desirable to suppress it to about %. After the fibers undergo false twisting due to the swirling flow and form a filament, adding real twist in the same direction as the untwisting direction allows the fibers to gather together and integrate, making it more difficult to twist than simply bound spun yarn. It is essential to improve yarn quality, especially resistance to straining during yarn abrasion, and to dramatically increase operational efficiency in subsequent processes such as winding and bran weaving.

As mentioned above, the direction of twisting by the ring twisting machine must be the same as the direction of untwisting by the nozzle 6.

On the other hand, if real twist is applied, the swirling flow will destroy the concentrated fiber structure, making it impossible to obtain a normal yarn, and the yarn will break, making it impossible to rescue the yarn. Here, the number of twists is the average fiber length of the fiber to be spun according to JIS
It is determined by the twist coefficient (English formula) specified under the twist index la. Here the first
Table 1 shows the experimental results using the apparatus shown in the figure, such as the influence of the twisting effect, that is, the directionality of the actual twist and the burning direction of the swirling airflow, or the twist coefficient, on the physical properties of the yarn and the fabric. - Shown in Table 2. Although there are slight differences in yarn physical properties and other properties depending on the average fiber length, if the twist index is 1 or less, a soft fabric with a special length of 0 can be obtained as well as the advantage of yarn productivity.
Table 1 Twisting effect (1) Spindle rotation speed...12,000 rpm (*...6000 rpm**..."orpm) 2nd
Table Twisting effect (2) Spinto/Number of shouts...・1
0,00.0 rpm (However, *...50
00 rpm **...o rpm As is clear from this table, it is necessary to lower the combustion index by 1 degree.

In other words, in the case of cotton fibers with an average fiber length of 23 ribs, the twist coefficient is 2.
．． 100% polyester staple fiber with a twist coefficient of 2.05 or less and an average fiber length of 54 when blending polyester staple fiber (65%) with an average fiber length of 34 ribs and cotton (35%). The object of the present invention cannot be achieved unless the Fuji coefficient is 1.63 or less.

When spinning these fibers, in conventional ring spinning, it is necessary to give twist coefficients (English formula) of 4, 35 and 2.2, respectively, in order to withstand the tension during spinning and wind the yarn. In contrast, when the fibers supplied from the front roller 5 are focused in a swirling flow as in the method of the present invention, as shown in the above values, This makes it possible to form yarns with extremely small twist coefficients. Although spinning is possible using a twist coefficient higher than this, in this case the yarn becomes thinner, harder and brittle, and the difference from conventional ring yarn becomes smaller, making it difficult to achieve the bulk and softness that is strongly demanded in the market. I find the characteristics suitable for obtaining Fuyaku and I am disappointed. Moreover, in this case, productivity also decreases.
Therefore, the characteristics of the yarn targeted by the present invention are emphasized as the fuel coefficient is lower than or equal to these fuel coefficients and the smaller the fuel coefficient is, but if it is too small, it becomes difficult to form the yarn even using a jet swirl flow, so the normal twisting index is The most preferable range is 6 to 10. However, as mentioned above, by making the thickness distribution of the fiber east asymmetrical at the front nip line or by using a special nozzle with an eccentric constriction part, the binding effect of the fiber east can be enhanced. Further reduce and bind. On the other hand, in order to weaken the twisting effect by lowering the fluid supply pressure, such as air, to the nozzle, and to reduce the air consumption and weaken the binding, it is necessary to slightly increase the twisting effect of the ring twisting machine. These may be combined as appropriate, taking into consideration various factors such as purpose, effectiveness, and economic efficiency. Further, the method of the present invention requires burning of the ring-twisted yarn in succession with the false twisting action by the swirling flow, as shown in FIG. This is because once the binding yarn created by swirling flow is wound into a package, the yarn form is incomplete, and when it is scaled in the next yarn twisting process, it is squeezed at guides, bending points, etc., and the yarn is This is because both the operation and yarn quality deteriorate, such as breakage and yarn unevenness that causes weak points. In addition, the method of the present invention is suitable for producing spun yarn using 100% stable raw material, but it is also suitable for producing core yarn in which filament or processed yarn is used as a core yarn and short fibers are coated around it,
Alternatively, it can also be applied to the manufacture of composite yarns, which are made by steadily feeding filaments or processed yarns using high-voltage electrodes or other suitable means, stacking them on a front roller nip line, and mixing them uniformly. Yes, the same effect can be achieved. In this way, the method of the present invention combines binding by enveloping the short fibers by swirling flow and binding by the actual descendant, thereby achieving practicality that can eliminate not only the disadvantages of the binding spinning method but also the disadvantages of the ring spinning method. This is a spinning method.

Example 1 Table 3 shows the yarn properties of the spun yarn according to the present invention, which was produced on paper using the apparatus shown in FIG. 1 under the following conditions.

Conventional ring spun yarn is shown as a comparative product. 3rd cover appearance conditions Short fiber...Polyester fiber (1.4d x mottled ribs) 0 Nozzle air pressure...1.3 [9/clump G
Paper yarn count...50'S Spindle rotation speed...
...1100 ratio/s As is clear from Table 3, a spun yarn with sufficient yarn properties was obtained with about 40% of the burn rate of the conventional ring spun yarn.

In this way, by incorporating a nozzle and a delivery roller into the weaving process, it has become possible to increase the production speed by about 2.5 times and to produce yarn with excellent bulkiness. Example 2 In the apparatus shown in FIGS. 5 and 6, wool fiber (average fiber length 82 ribs) was used as the short fiber material of the roving 2, and polyester multifilament yarn (50 denier 24 filaments) was used as the filament yarn 16* *The two are overlapped at the front roller 5 and false twisted using the nozzle 6 to form a yarn, and then the actual twist (15 mm) is applied in the direction of twisting using a twisting device to create a core yarn of 2 marks and a composite yarn. produced yarn.

Trailing conditions Nozzle 6...Those shown in Figure 3, Air pressure of nozzle 6...
1.3k9/Lump G twisting device spindle rotation speed...1
1000 te/m, voltage of weaving device 18...3000Vo
lt, Twisting index...9 (=Twisting coefficient 0.99) Table 4 As is clear from this table, the yarn and composite yarn of the present invention are soft because they are soft and have a high resistance when resisting. It also had excellent practical performance such as durability.

On the other hand, pigs 3 and 4 made using the conventional method had a hard yarn texture because the number of twists was similar to that of the original thread.
Although it is soft, there are some problems with its practical performance in terms of resistance.As is clear from this table, the core yarn and composite yarn of the present invention are soft because they are lightly twisted. It also had excellent practical performance such as squeezing ability. On the contrary, conventional method No. Nos. 3 and 4 had a hard thread texture because the number of threads was similar to that of a ring thread. Earth. Although Nos. 5 and 6 were soft, they had some problems in practical performance in terms of resistance to straining.

[Brief explanation of drawings]

Figures 1 to 6 relate to the present invention, Figure 1 is a schematic side view of the device used in the present invention, Figure 2 is a graph showing the relationship between fiber density and thickness, and Figure 3 is the invention 1 of the nozzles used in
A cross-sectional view showing an example, FIG. 4 is a cross-sectional view taken along the line W-W in FIG. 3 in the direction of the arrow, FIG. 5 is a schematic side view of the core yarn manufacturing apparatus, and FIG. FIG. 2 is a schematic side view of a composite yarn manufacturing device. A...Draft device, 5...Front roller, 6.
．．・Nozzle, 8...Delivery loaf. Figure 2 Figure 3 Figure 4 Figure 1 Figure 5 Figure 6

Claims (1)

[Claims] 1. Drafting a fiber bundle, then twisting it by a swirling fluid flow,
A method for producing a spun yarn, which comprises untwisting and then winding the yarn while continuously adding actual twist with a twist index of 12 or less in the same direction as the untwisting direction of the false twist. However, the twist index is √(average fiber length of stable (
mm)) x twist coefficient (English formula). 2 A fiber bundle drafted together with at least one filament yarn or textured yarn is false-twisted by twisting and untwisting using a swirling fluid flow, and then the actual twist with a twisting index of 12 or less is continuously applied to the aforementioned false twisting. A method for producing a spun yarn characterized by winding the yarn in the same direction as the untwisting direction of the yarn. However, the twist index is √(average fiber length of stable (
mm)) x twist coefficient (English formula). 3. Claim 2, characterized in that at least one filament yarn or processed yarn is supplied after being opened.
The method for producing the spun yarn described in Section 1.