JPS5847482B2 - Manufacturing method of variable binding spun yarn - Google Patents

Description

[Detailed Description of the Invention] A. TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement in a bound spun yarn in which the core of the yarn consists of a C. fiber bundle with substantially no twist, and the surface of the yarn is bound with wound fibers.

More specifically, the present invention relates to a method for producing a spun yarn having a design yarn-like appearance and feel.

B. Conventional examples and their problems Traditionally, decorative threads have been widely used in interior cloths such as curtains, upholstery, and rugs to give them varying surface effects.

Many of these decorative yarns are made by combining regular spun yarn, filament, and processed yarn under different tensions, and the spun yarn that is loose around the filament is wound around the filament and has irregularities on the yarn itself.

However, for such design yarns, the spun yarn that has been spun once is processed into a special yarn process one or more times.
The disadvantage is that the rewinding process is increased, which is extremely time-consuming and labor-intensive, and further increases the cost.

On the other hand, the binding spinning method that is the technical object of the present invention is
The present inventors have already provided this as a basic technology in JP-A No. 64045 and the like.

However, such known techniques are still unsatisfactory due to lack of variation as a design yarn.

C. OBJECTS OF THE INVENTION It is an object of the present invention to improve the drawbacks of the prior art, and to improve efficiency and reduce production costs by directly producing bundled spun yarn with excellent design effects using only a spinning process.

Furthermore, the object is to obtain a differentiated product that has the unique feature that the obtained product can be used as a single yarn.

D. Configuration of the present invention The present invention has the following precepts.

"After a fiber bundle consisting of stable fibers is drafted once, it is fed to the nip, the staple fibers located in the center are temporarily twisted by a fluid nozzle, and then the fibers located at both ends are hardly subjected to the temporary twisting effect. In this method, the yarn after passing through a fluid nozzle is taken off at an angle to the nozzle exit direction, and the supply of staple fibers is controlled by looping the yarn in accordance with the take-up speed. A method for producing a twisted spun yarn characterized by maintaining an overfeed rate sufficient to make the sag appear.

The fluid nozzle used in the present invention has a yarn passage hole in the center and an injection hole that spouts fluid into the yarn passage hole, and generates a swirling flow in the yarn passage tag to impart a temporary twist to the yarn. Refers to something that can be done.

Air, steam, water, etc. can be used as the fluid, but compressed air is most preferred in terms of handling.

The fluid pressure used is necessary to add enough temporary twist to form a loop-shaped slack in the yarn, but depending on the spinning count,
Varies depending on spinning speed and nozzle performance.

The overfeed rate is suitably 15% or more, but 25 to 40% is most preferred.

In other words, if the overfeed rate is too low, it will be difficult to form large loop-shaped sag, and the effect of the design yarn will be weakened.On the other hand, if the overfeed rate is too high, the strength will decrease, the elongation due to the initial load will increase, and the process in the post-processing will be reduced. The above problem is more likely to occur.

Further, in the present invention, the angle between the nozzle exit direction and the yarn take-up direction is preferably 45° to 135°.

This is to give unevenness to the yarn to enhance the design effect.

E. Effects of the present invention Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a process schematic diagram showing one embodiment of the method for producing a modified spun yarn of the present invention.

A fiber bundle made of stable fibers, such as a sliver 1, is drafted between rollers 2 and 30 and fed between conveyor belts 4 and 4' having wedge-shaped open ends.

The drafted fiber bundle is added to the conveyor bell 4.4' by a temporary twist nozzle 5, and after passing through the nozzle, it is bent by a guide 6 in a direction having an angle θ with respect to the nozzle exit direction, and is taken up by a delivery roller 7. It passes through and is wound up by the winder 8.

Here, the angle θ between the nozzle exit direction and the yarn take-off direction is most preferably 90°, but the effects of the present invention can also be achieved with an angle in the range of 45° to 135°.

In the present invention, the fiber bundles are produced at high speeds (e.g. 1007n/
The stable fibers located in the center are drafted by the front roller 3 (min or more) and nipped by the roller 3, and the stable fibers located in the center are added to the conveyor belt by the temporary twist nozzle 5. However, the fibers located at both ends are not twisted and are transported by a conveyor belt in parallel with the added fiber bundle, and are unified in a aligned state until they pass through the nozzle and pass through the telly roller 6. It will be solved.

Therefore, the yarn wound in the winder 8 is unraveled by the number of additional yarns due to temporary twisting, and the circumferential surface of the core fiber bundle is substantially untwisted (sometimes alternating twists may remain). (Fibers that were not twisted on the conveyor belt)
becomes a spun yarn that is wound and tied.

In this case, in the present invention, the yarn after passing through the nozzle is taken off at an angle to the nozzle exit direction, and the overfeed ratio of the front roller speed to the delivery roller speed is set to a value sufficient to form a loop-shaped slack. The bound spun yarn of the present invention shown in FIGS. 2 and 3 is obtained.

FIG. 2 is a schematic diagram of the outer appearance of the variable binding spun yarn of the present invention.

Loop-shaped slacks 9 protruding in the radial direction are randomly generated in different sizes, giving it the appearance of a decorative yarn.

FIG. 3 is an enlarged view of the variable binding spun yarn of the present invention.

The loop-shaped slack 9 is formed in the unbound part of the bundled fibers 10 so that the core fiber bundle bulges out in a spiral shape, and some of these slacks are completely separated from the center part of the yarn. There are some parts that are shaped like loops, and the fibers in these parts are spread out with almost no twist.
It has a large bulk and is soft to the touch.

In the present invention, it is sufficient to have such loop-shaped slack randomly, and it is also possible to include simply zigzag-shaped portions or straight-shaped portions without loop-shaped slack.

In the present invention, the reason why a loop-shaped slack is formed by pulling the yarn after passing through the nozzle at an angle to the nozzle exit direction is not clear, but when the yarn is pulled straight in the nozzle exit direction (see Fig. Even if other conditions are exactly the same, loop-like slack will almost never occur in the thread path shown by the dotted line in
As shown in Figure 4, the pitch of the wound fibers is small and even, resulting in a tightly packed zigzag-like yarn, so if the yarn path is bent, the airflow ejected from the nozzle outlet will cause the yarn to be unraveled. It is speculated that part of the core fiber bundle is pushed out to the side and the slack is suppressed.

In addition, in the present invention, after the drafted fibers are fed into the nip, the fibers located at both ends and not subjected to the temporary twisting action are transferred until they are integrated. Possible methods include using an open conveyor belt, using a conveyor belt provided only on the lower side, using a suction air flow through an air duct, and using a false-twisting air nozzle.

Among these, it is most preferable to use a conveyor belt with a pair of upper and lower ends that are open in order to best achieve a loop-shaped slack shape.

Further, it is preferable that the opening width is 5 mm or less.

By using a pair of upper and lower conveyor belts and narrowing the opening width, the shape of the loop-like slack can be stabilized, and the elongation of the yarn can also be reduced.

Unlike conventional decorative yarns, the modified bound spun yarn of the present invention described above can be produced in just one spinning process and at a speed significantly higher than the conventional spinning speed, so it is extremely inexpensive in terms of manufacturing cost. It is.

In addition, when viewed as a thread, it has no twist and has randomly spread loop-like slacks of various sizes. Due to its flexible texture and variable appearance, it can be used for interior purposes such as curtains and rugs, as well as for summer sweaters. It can also be used for clothing purposes.

The material of the staple fiber to be used is not limited, and any fiber can be used, and fibers of different materials, deniers, and fiber lengths may be mixed and used.

Furthermore, if necessary, it is also possible to supply filaments or spun yarns from the front roller and use them as part of the core fiber bundle.

Examples will be shown below to specifically explain the present invention.

EXAMPLE A sliver was made from acrylic stable fibers of 3 d x 10 2 m 7 y L (average fiber length) through 3 steps of carding and gilling, or the modified spun yarn of the present invention was spun using the apparatus schematically shown in FIG. 1 under the following conditions. I put it out.

(1) Sliver thickness: 6 g/m (2) Spinning count: 1/4 (3) Front roller speed (VF): 1 5
0mlmin (4) Delivery roller speed (VD)
: 1 1 5 m/miyr30% (6) Thread path change angle (θ in Figure 1): 90° (7) Compressed air pressure: 3. The bound spun yarn obtained at 2 ky/cnt had the shape shown in FIGS. 2 and 3, and had a high bulk and a soft texture.

When several types of curtains were prototyped using this thread as a weft thread, the loop-shaped sag was clearly visible on the surface, and it was possible to obtain a varied surface effect.

In addition, the loop-shaped slacks occurred randomly, giving a more favorable appearance compared to regular design yarns.

Furthermore, the method of the present invention was highly efficient and inexpensive to manufacture.

As a comparative example, the yarn obtained by spinning under the same conditions except that θ was set to 00 was a tightly zigzag-shaped yarn with no loop-shaped slack as shown in Figure 4. The desired design yarn could not be obtained.

[Brief explanation of drawings]

Fig. 1 is a process schematic explanatory diagram showing an embodiment of the method for manufacturing the variable bound spun yarn of the present invention, Fig. 2 is a schematic diagram of the external appearance of the variable bound spun yarn of the present invention, and Fig. 3 is the variable bound spun yarn of the present invention. FIG. 4 is an enlarged schematic diagram of a part of a spun yarn, and FIG. 4 is a schematic diagram of a conventional bound spun yarn produced without using the method of the present invention. 1: Sliver, 2: Batho crawler, 3: Front roller, 4, 4': Conveyor belt, 5: Temporary twist nozzle, 6:
Guide, 7: Delivery roller, 8: Winder, 9: Loop-shaped slack, 10: Wrapped fiber (binding fiber).

Claims (1)

[Scope of Claims] 1. After drafting a fiber bundle consisting of stable fibers, the fiber bundle is supplied in two passes, the stable fibers located in the center are temporarily twisted by a fluid nozzle, and then the stable fibers located at both ends are almost completely twisted. In a method for producing a bundled spun yarn in which fibers that are not subject to twisting are integrated and are decoupled after passing through a fluid nozzle, the yarn after passing through a fluid nozzle is taken off at an angle to the nozzle exit direction, and the stable fibers are adjusted to the taking speed. A method for producing a twisted spun yarn, characterized in that the supply of the yarn is maintained at an overfeed rate sufficient to form a loop-shaped slack in the yarn. 2 After passing through the fluid nozzle, align the yarn at 45° with the nozzle exit direction.
2. The method for producing a karikeito spun yarn according to claim 1, wherein the yarn is taken at an angle of 135° to 135°. 3. The method for producing a variable bound spun yarn according to claim 1, characterized in that the Ohno coffee feed rate is 15% or more. 4. The method for producing a twisted spun yarn according to claim 1, characterized in that the overfeed rate is 25 to 50%. 5. The method for producing a twisted spun yarn according to claim 1, characterized in that, after the Nisop is supplied, the fibers that are not subject to temporary twisting are transported by a pair of conveyor belts with open ends.