JPH0160088B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves feeding a filament yarn of synthetic fibers such as nylon or polyester into the center of a cotton roving as a core yarn, and coating the filament yarn with a cotton layer in a relatively stable state. The present invention relates to a method for manufacturing a cotton-covered core yarn and is applied in the field of yarn manufacturing technology in the textile industry.

<Prior art> For example, as shown in FIG. 2, a conventional cotton-covered core yarn is produced by supplying a core yarn 7 between front rollers 4, 4 and aprons 3, 5, passing through a tensor to a core guide roll. The front rollers 4 and 4 are fed together with the effect yarn 1 to form the covering layer.
to form a cotton-covered core yarn. In this case, it is difficult to control the necessary tension to be applied to the core yarn 7, and the result is a simple twist-and-ply yarn effect, making it difficult to achieve satisfactory cotton fiber covering. It was hot.

Also, the publicly known Korean patent number shown in Figure 3
In the case of the core yarn manufacturing method of No. 3772 (Patent Publication No. 233, pages 117-119), the core yarn 7 is fed into the core guide 11 provided between the back roller and the cradle, and brought into contact with the top apron 3. However, since the effect yarn 1 passes through the grooved roller 12 and reaches the gripping point 15 of the front rollers 4, 4, the gripping of the cotton fiber becomes uncertain at the grooved portion of the roller 12, and therefore the core yarn 7 An uneven draft occurs during covering, and the control of the core yarn becomes uncertain, resulting in a defect in that part of the core yarn is exposed on the outside of the covering fiber (effect yarn), degrading the appearance. . In addition, methods for manufacturing funci yarns such as those described in Japanese Patent Publication No. 44-22788 and Japanese Patent Publication No. 47-18055 are also known, but in the case of the former, elastic yarn is used as the core yarn;
The effect yarn is configured to cover the periphery of the core yarn by the contraction action of the elastic core yarn, and therefore cannot be applied when the core yarn is anything other than an elastic body. In the latter case, two twisted yarns are used as the core yarn, and the floating yarn is covered on top of the core yarn. , it is not possible to produce special fancy effects.

<Problems to be Solved by the Invention> The present invention solves the above-mentioned conventional problems by hiding the core yarn almost completely in the center of the effect yarn. The object of the present invention is to provide an improved manufacturing method for producing short fiber coated core yarns. Note that the core yarn of the present invention is a non-stretchable yarn.

<Example> FIG. 1 schematically shows an apparatus used for carrying out the method of the present invention. In FIG. During the process, the cotton roving 1 wraps the core yarn 7 around the core yarn 7, which has a constant tension, with less tension than the core yarn. When synthetic fiber filament yarn such as polyester or nylon is used as the core yarn, the core yarn tension between the gripping point 15 of the front rollers 4 and 4 and the winding section 14 is made larger than the tension of the effect yarn. By applying a certain range of tension to the core yarn fed to the gripping point 15 of the front rollers and making the core yarn delivery speed by the front rollers 4, 4 smaller than the surface speed of the front rollers 4, 4, the core yarn is As a result of experiments, the present invention has found that it is effective to make the yarn 7 slip slightly with respect to the front rollers 4, 4.

The core yarn is connected to the tension adjustment device 9 and the front roller 4,
When a constant tension is applied between rollers 9' and 4,
In order to control this slip, one of the rollers 9' and 9'' making up the tension adjustment device 9 is equipped with a roller having a high friction anti-slip function such as a rubber coated roller. Use. In addition, the tension adjustment device 9 and the front rollers 4, 4
Although the tension applied between them varies depending on the core yarn 7 used, the supply ratio of the core yarn 7 and the cotton roving 1 passing through the gripping point between the front rollers 4, 4 is set at 1:1.02 to 1:1.60. The covering condition was extremely good when the core yarn was slightly slipped at the gripping point of the front roller 4 so as to fall within this range.

In carrying out the invention, it is convenient that the feed speed ratio of the core yarn and the effect yarn can be achieved using known gearing means and can be transmitted from the front rollers 4,4.

In the above range, if the feeding speed ratio is less than 1:1.02, the core yarn 7 will be twisted together with the cotton roving 1 and the surface of the core yarn 7 will be exposed, and if it is more than 1:1.60, the core yarn tension will be If it is too large, the core yarn 7 may break or it becomes difficult to maintain the desired tension due to the slip phenomenon.

In the tension adjusting device 9 composed of a pair of rollers 9' and 9'' used for carrying out the present invention, it is preferable that the other of the tension rollers 9' is a drive roller 9'' made of metal or the like with high hardness. In this case, it is desirable that the pressure applied by the rubber tension roller 9' to the roller 9'' is, for example, about 1 kg/cm ² .The core yarn 7 is wound once around the rubber tension roller 9' and It is fed in the direction of the gripping point 15 of the front rollers 4, 4 while maintaining tension (4.0 g/d), and the rubber tension roller 9' is driven by the metal drive roller 9''.

Therefore, the tension and feed speed ratio conditions described above are the conditions under which the core yarn passes between these rollers 9', 9'' and exits.

As a result of experiments, it has been found that the appropriate tension range when the core yarn 7 is wound around the rubber tension roller 9' once and sent out is 3.0 to 4.0 g/d for polyester or nylon filament yarn for clothing. It was done. Below this range, the ability of the core yarn 7 to hide inside the cotton roving 1 at the gripping point 15 of the front rollers 4, 4 is reduced, and above this range, the core yarn may experience breakage or excessive slip as described above. There has occurred.

A 27's cotton covered core yarn is produced by the method of the present invention using a non-stretchable 100 denier polyester filament yarn for clothing as the core yarn and a 54's fleece cotton roving as the effect yarn. U
% (the value obtained by dividing the average deviation by the average value (see the Worcester Textile Dictionary, Worcester Itomura Kenki section)) The result was an average of about 7-8%, which is different from normal
30′sP/C (polyester/cotton) blended yarn U% 11~
This was much better than 12%, and we were able to confirm that the covering effect was very excellent, and that the draft of the covering fleece was hardly disturbed by the introduction of the core yarn. (In the above experiment, the supply speed ratio of both rollers was 1:1.10, and the core yarn tension was
(This was carried out under the condition of 3.1 g/d) The phenomenon in which high tension is applied to the core yarn of the present invention and the supply ratio of the covered yarn to the core yarn is 1:1.02 to 1.60 is due to the fact that the front roller grip Stress-strain curve characteristics of the non-stretchable core yarn used, which cause slipping of the core yarn at a point and recovery shrinkage of the core yarn after passing the gripping point, are involved. Because it uses synthetic fiber filament yarn, its stress-strain curve characteristics are completely different from those of clothing yarn.When applying a yarn with low elongation under stress, such as polyester sewing yarn for industrial materials, to the core yarn, Even when a tension of 4 g/d or more (8 g/d depending on the yarn) is applied, the supply ratio of the covered yarn to the core yarn is a value that achieves the intended purpose of the present invention, as has been shown up to now. It will be obvious to those skilled in the art from the description. Also,
In the examples, cotton roving was used as the covering yarn, but the intended purpose of the present invention can also be achieved by using spinning roving made of short fibers of various fibers including rayon.
Furthermore, if short fiber rovings having different dyeability to the core yarn are used, the dyeing effect can be achieved by one-bath dyeing.

<Effects of the Invention> In the present invention, for example, fleece-like cotton roving, which is easy to dye, is used as the effect yarn, and polyester yarn, which is difficult to dye but has strong tensile strength, is used as the core yarn, and it is mixed with the cotton-covered core yarn. For example, it has both the dyeing advantage that only the dyeing of the cotton roving needs to be considered, and the physical property advantage that the core yarn reinforces the tensile strength.

In addition, in particular, the method of the present invention can be carried out by making simple design changes to existing cotton spinning machines, requiring almost no special facilities or costs, and the method of the present invention can be carried out by making simple design changes to existing cotton spinning machines. Core yarn using cotton roving can be made to exhibit the same effect as spun cotton yarn.

In carrying out the present invention, it is natural that the design is not limited to the above-mentioned embodiments, and that various changes can be made within the scope of the claims.

For example, instead of the core thread 7 wrapping once around the rubber tension roller 9', by applying appropriate pressure to the roller 9'' by means of the roller 9', both rollers 9',
It is also possible to apply the necessary tension to the core yarn 7 passing between the 9''.

As described above, according to the present invention, by providing an existing cotton spinning machine with a very simple core yarn tension adjustment device, a synthetic fiber yarn for tensile force reinforcement is used as a core, and easily dyeable cotton fibers are arranged around it. It is possible to easily obtain a cotton-covered core yarn that is sufficiently covered and has both the physical properties of a core yarn and a covered yarn. It will be clear to those skilled in the art that instead of cotton roving, an effective core yarn can be obtained by using, for example, Kyupra or vinylon fiber roving produced by a cotton spinning method.

[Brief explanation of drawings]

FIG. 1 is a process schematic diagram showing an embodiment of the manufacturing method according to the present invention, and FIGS. 2 and 3 are process diagrams showing a conventional method for producing cotton core yarn. This is a schematic illustration of the part that is sent between the two. 1...cotton roving (effect yarn), 2...core yarn,
3, 5...Upper and lower aprons, 4...Pair of front rollers, 15...Gripping point of front roller, 9...
Core thread tension device, 9′...Rubber tension roller, 9″...
Metal driven roller.

Claims (1)

[Claims] 1. When producing a core yarn using a non-stretchable synthetic fiber filament yarn such as nylon or polyester as a core yarn and a short fiber roving as a covering yarn, a high tension of 3.0 g/d or more is imparted to the core yarn, and the core yarn is 1. A method for producing core yarn, which comprises doubling core yarn and covering yarn at a supply ratio of covering yarn to 1:1.02 to 1.60.