JPH04352820A - Production of core yarn - Google Patents

Abstract

PURPOSE:To obtain core yarn, having a high yarn tension and hardly slipping both filament yarn as core fiber and fiber of a fiber bundle as sheath fiber by feeding the filament yarn while applying a tension to the drafted fiber bundle and making a turning air stream act on both. CONSTITUTION:An apparatus 1 for producing core yarn having a filament yarn feeder 3 attached to each spinning unit 2 of plural spinning apparatuses installed side by side and a drafting device 5 for drafting a sliver (S) into a fiber bundle 4 of a prescribed thickness is used to introduce the sliver (S) from a trumpet guide 10 of the drafting device 5. The sliver (S) is then passed through back rollers 9, the third rollers 8 and front rollers 6 and drafted to afford the fiber bundle 4. Filament yarn (F) is fed from a feed nozzle 12 of the filament yarn feeder 3 through a guide 15 to a space between the front rollers 6 and aprons 7 while applying >=10g tension thereto. A turning air stream is then made to act on both with an air spinning nozzle 11 to provide the objective core yarn (Y) composed of the filament yarn (F) as a core and the fiber of the fiber bundle 4 as a sheath.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing core yarn.

0002

2. Description of the Related Art Core yarns are already known in which the core fibers are filament yarns of synthetic fibers such as polyester and the sheath fibers are fibers of fiber bundles such as cotton. In order to produce this core yarn, it is sufficient to supply filament yarn to a fiber bundle drafted by a drafting device and pass it through an air spinning nozzle.The filament yarn becomes a core fiber by the action of the swirling air flow, and the fiber bundle is A core yarn having the fibers as sheath fibers is obtained. This core yarn has both the strength of the core fiber and the texture of the sheath fiber.

0003

[Problems to be Solved by the Invention] However, in the conventional method for manufacturing core yarn, the tension applied to the filament was not taken into account, so a core yarn with weak yarn strength was manufactured in which the core fiber and sheath fiber were easily misaligned. There was a problem. Conventionally, as a countermeasure to this problem, a lubricant was applied to the core fibers, but this required a step to apply the lubricant, resulting in an increase in cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a method for manufacturing a core yarn that can inexpensively obtain a strong core yarn in which the core fibers and the wound fibers do not easily shift from each other.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention supplies a filament yarn to a drafted fiber bundle while applying a swirling air flow, thereby making the filament yarn a core fiber and a fiber bundle fiber. A method for producing a core yarn using the filament yarn as a sheath fiber is characterized in that the core yarn is produced while applying a tension of 10 g or more to the filament yarn.

[0006]

[Effect] Core yarn is manufactured while applying a tension of 10 g or more to the filament yarn, so the sheath fiber is tightly wrapped around the core fiber of the filament yarn, resulting in a strong core yarn with good conjugation properties and a strong core yarn that does not easily slip between the core fiber and sheath fiber. can get. The reason for setting the tension to be 10 g or more is because if the tension is less than 10 g, a core yarn with poor binding properties and a weak yarn strength in which the core fiber and sheath fiber tend to shift easily will be produced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, a core yarn manufacturing apparatus 1 is constructed by attaching a filament yarn supplying apparatus 3 to a spinning unit 2 of a plurality of spinning apparatuses arranged in parallel. This spinning unit 2 is provided with a draft device 5 that drafts a sliver S supplied from a sliver can (not shown) into a fiber bundle 4 of a predetermined thickness.

In the illustrated example, this draft device 5 is composed of a front roller 6, an apron 7, a third roller 8, and a back roller 9, and a sliver S is provided upstream of the back roller 9.
A trumpet guide 10 is provided downstream of the front roller 6 to introduce the fiber bundle 4, and an air spinning nozzle 11 is provided downstream of the front roller 6 to apply a swirling air flow to the drafted fiber bundle 4 to twist it. As shown in FIG. 2, the air spinning nozzle 11 consists of a first nozzle 11a and a second nozzle 11b whose swirling directions of the swirling airflow are mutual.The first nozzle 11a performs suction and balloon formation, and the second nozzle 11b Demonstrates false twisting action. The yarn spun from this air spinning nozzle 11, that is, the core yarn Y, is supplied to a winding section via a delivery roller 12, and is wound into a package P.

A filament supply device 3 is provided near the draft device 5 for supplying filament yarn F supplied from a package (not shown) to the drafted fiber bundle 4 from between the front roller 6 and the apron 7. This filament supply device 3 is equipped with a feed nozzle 12 that sends out a filament yarn F by a compressed air flow.
3 and 14 are connected, and a trough-like guide 15 for guiding the filament yarn F from between the front roller 6 and the apron 7 onto the fiber bundle 4 is attached to the yarn guide tube 14 on the discharge side. Further, a tensor 16 for applying a predetermined tension to the filament yarn F is provided upstream of the suction-side yarn guide tube 13.

As shown in FIG. 2, this tensor 16 has a frame 1 having thread guide holes 17, 17 facing each other at both ends.
8, and a rod 19 is provided approximately in the center of this frame 18.
is provided upright, and a dish-shaped lower tensor piece 20 is fitted into this rod 19. In addition, the rod 19 has
A dish-shaped upper tensor piece 21 is fitted so as to be able to rise and fall and rotate freely so as to ride on the lower tensor piece 20. A ring-shaped weight 22 is placed on top of the upper tensor piece 21, and both tensor pieces 20 , 21, the filament yarn F is sandwiched between them to apply a desired tension. An operating member 23 for raising and lowering the upper tensor piece 21 when threading the filament thread F is fixed to the upper end of the rod 19 with a nut 24.

Next, the method of the present invention will be explained using the core yarn manufacturing apparatus having the above configuration. When the sliver S made of a collection of short fibers such as cotton is supplied from the trumpet guide 10 to the drafting device 5, the sliver S passes through the back roller 9, third roller 8, apron 7, and front roller 6 whose circumferential speed increases sequentially. In the meantime, a fiber bundle 4 having a predetermined thickness is drafted.

In parallel with this, a filament yarn F made of synthetic fiber such as polyester is supplied to the filament yarn supplying device 3 via a tensor 16, and the filament yarn F is sent out by a feed nozzle 12, and is passed through a guide 15 to a front roller 6. The fiber bundle 4 is guided between the apron 7 and the apron 7 and merges with the drafted fiber bundle 4, and is introduced together with the fiber bundle 4 through the front roller 6 into the air spinning nozzle 11.

The second nozzle 11 of this air spinning nozzle 11
Due to the false twisting action of b and the suction/balloon forming action of the first nozzle 11a, the filament yarn F is twisted together with the fiber bundle 4, so that the filament yarn F becomes the core fiber Ya and the fiber of the fiber bundle 4 becomes the sheath fiber Yb. A core yarn Y having a two-layer structure is produced in which a core fiber Ya is covered with a substantially parallel sheath fiber Yb, and a portion Yc of the sheath fiber Yb is spirally wound. The core yarn Y is sent to a winding section via a delivery roller 12 and wound into a package P.

This manufacturing process is characterized in that the core yarn Y is manufactured while applying a tension of 10 g or more to the filament yarn F. The tension is applied by the tensor 16, which is applied by placing a weight 22 on the upper tensor member 21 and applying the weight to the upper and lower tensor pieces.
Since the structure is such that tension is applied to the filament yarn F by sandwiching it between 0 and 21, the desired tension can be applied accurately and stably, unlike the spring type.

The yarn strength (tensile strength) and elongation of the core yarn Y manufactured using this core yarn manufacturing apparatus 1 while applying various tensions to the filament yarn F were measured. Figure 3 (a) shows the measurement results for filament thread F only, and (b) to (g) show the measurement results for filament thread F with 8 g and 10 g.
, 20 g, 40 g, 60 g, and 100 g of tension. Note that the filament yarn F is made of PBT (polybutylene terephthalate) fiber, and the fiber bundle 4 is made of cotton. Core yarn Y has a cotton to PBT fiber ratio of 72:28 and is manufactured to a thickness of 20th yarn. FIG. 4 shows these measurement results plotted on a graph showing the relationship between tension, yarn strength, and elongation value (elongation rate).

As can be seen from these graphs, in the case of only the filament yarn F, the elongation value is large and the yarn strength is weak, but in the case of the core yarn Y, as the tension applied to the filament yarn F increases, the elongation value increases. The smaller the strength value, the stronger the thread strength. However, if the tension is less than 10g, as in the case of 8g tension in Figure 3(b), a large deviation occurs in the strength and elongation curve during the elongation process, and the elongation value is still large and the yarn is strong. is weak. This is because the conjugation between the core fiber and the wrapped fiber is poor, and the core fiber and the wrapped fiber tend to be misaligned.

Therefore, the present invention provides filament yarn F with 1
Since the core yarn Y is manufactured while applying a tension of 0 g or more, the short fibers are tightly wound around the core fiber of the filament yarn F, resulting in a strong core yarn Y that has good conjugation properties and does not easily slip between the core fiber and the wrapped fiber. Obtainable. In addition, as the tension applied to the filament yarn F increases, a core yarn Y with strong yarn strength can be obtained, so simply by adjusting the tension of the filament yarn F, it is possible to easily obtain a core yarn Y with a desired yarn strength. Become.

[0019]

In summary, according to the present invention, since the core yarn is manufactured while applying a tension of 10 g or more to the filament yarn, the sheath fibers are tightly wound around the core fibers of the filament yarn, and the conjugation property is good. It is possible to obtain a strong core yarn in which fibers and sheath fibers do not easily slip off. Moreover, the tension can be increased to 10g without applying any oil to the core fiber.
By simply doing the above, it is possible to obtain a yarn with strong yarn strength, so that it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a side view of a core yarn manufacturing apparatus used to carry out the method of the present invention.

FIG. 2 is a sectional view showing the structure of an air spinning nozzle.

FIG. 3 is an enlarged perspective view showing the structure of the core yarn.

FIG. 4 is an enlarged sectional view of the tensor in FIG. 1.

FIG. 5 is a graph showing the measurement results of yarn strength and elongation.

FIG. 6 is a graph showing the relationship between tension and yarn strength and elongation values.

[Explanation of symbols]

4 Fiber bundle F Filament thread Y core yarn

Claims (1)

[Claims] 1. A method for producing a core yarn in which the filament yarn is a core fiber and the fibers of the fiber bundle are sheath fibers by applying a swirling air flow to a drafted fiber bundle while supplying the filament yarn. 10g per
A method for producing a core yarn, characterized in that the core yarn is produced while applying the above tension.