JPH05321063A - Production of roving for core yarn - Google Patents

Abstract

PURPOSE:To enable ready production of a roving having a double layer structure and excellent in covering ratio in a roving process. CONSTITUTION:A roving machine used in this production is equipped with a special trumpet (3) involving a lower A trumpet of an ellipsoid opening having the horizontal long axis and an upper B trumpet of an ellipsoid or round opening each smaller than that of the A trumpet and having the vertical longitudinal axis in the case of the ellipsoid on the supply side (17) of the draft mechanism (1). An untwisted A fiber bundle (2) is supplied to the above-mentioned A trumpet and a twisted B fiber bundle (10) is supplied to the B trumpet. Both the A and B fiber bundles (2) and (10) are simultaneously drafted by the same draft mechanism (1). The B fiber bundle (10) is placed at the almost laterally central position of the flat A fiber bundle (2) and the whole fiber bundles are twisted and spun so as to wrap the B fiber bundle (10).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing bilayer rovings for core yarns.

[0002]

2. Description of the Related Art Conventionally, many chemical and synthetic fibers have been produced and used together with natural fibers in various fields in conformity with their respective fiber characteristics, but the fiber characteristics are not sufficient for a specific application. For these reasons, these fibers have been twisted and woven or mixed-spun according to their properties, and given new properties to meet their applications. An example is a method for producing a composite spun yarn by mixing spinning fibers such as cotton, wool, and cut fibers and filament yarns in a spinning machine, which is the final drafting process of spinning fibers, and twisting them to produce a composite spun yarn. Various methods are known.

For example, in Japanese Examined Patent Publication No. 40-8743 or Japanese Examined Patent Publication No. 54-15941, twisting is performed with filament yarns, which are long fibers, as cores and spinning fibers, which are short fibers, coated on the outer periphery of the cores. There has been proposed a method of manufacturing a core yarn by incorporating it.

Considering the manufacturing method of the core yarn, the above-mentioned spinning method is the most typical example.
The entire spinning process is targeted, and if it is distinguished depending on which process of the spinning process has the two-layer structure (core part and sheath part), the core sliver is made in the drawing process, and this is passed through the roving and spinning processes to obtain the core yarn. How to spin out. A method in which core roving is made in the roving process, and this is passed through a spinning process to spin out the core yarn. As mentioned above, two kinds of raw yarn (spun yarn, spun yarn,
There are three methods of spinning the core yarn by simultaneously supplying filaments and the like).

[0005]

However, in the above-mentioned method, even if a bent-angle core sliver is produced, the two-layer structure collapses due to the drafting action of each machine as the subsequent roving and spinning steps are performed, and the final yarn At the stage, there is a problem that the fibers are dispersed in an ordinary blended yarn, and in the conventional method, there is a drawback that the raw yarn supplying mechanism of the roving frame and the spinning frame becomes complicated. An object of the present invention is basically to provide a method capable of producing a core roving with a good coverage while employing the above-mentioned method and by a simpler method.

[0006]

In order to solve the above-mentioned problems, the method of the present invention adopts the following constitution. That is, a special trumpet with an elliptical opening A trumpet having a horizontal major axis at the bottom and an elliptical or perfect circular trumpet having a vertical major axis with an opening smaller than the A trumpet at the top, Provided on the supply side of the roving machine draft mechanism, a non-twisted A fiber bundle is attached to the A trumpet
A twisted B fiber bundle is supplied to the B trumpet, both A and B fiber bundles are simultaneously drafted by the same drafting mechanism, and the B fiber bundle is positioned approximately at the center of the flat A fiber bundle in the width direction. , B fiber bundle is wrapped around the whole so as to be wrapped and spun.

[0007]

According to the present invention, the special trumpet having the above-described structure is arranged in the draft mechanism of the roving machine, and the B fiber bundle twisted from the upper portion thereof, for example, the roving roving, is relatively lightweight (light weight per unit length). While supplying a twisted sliver of (weight), a non-twisted A fiber bundle, for example, a normal sliver is supplied from the lower part, and while both are drafted in the draft zone, AB fiber bundle is wrapped around it. Since both fiber bundles are twisted and spun, a roving yarn having a two-layer core-sheath structure in which the B fiber bundle is the core portion and the A fiber bundle is the sheath portion is easily manufactured without using a complicated mechanism. You can

In the core-sheath two-layer structure roving yarn according to the present invention,
Most importantly, the core is evenly covered by the sheath. For that purpose, it is necessary to keep the tension of the fiber bundle of the core part uniform. If the supply tension of the core is non-uniform, uneven coating will occur. Especially when the target fiber bundle is a draftable fiber as in the present invention, a constant tension is required. However, in the present invention, since the fiber bundle twisted in the core portion and the non-twisted fiber bundle are used in the sheath portion, the above problems are completely satisfied, and the roving yarn for core yarn having a good coverage is provided. Can be manufactured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing a main part of a draft mechanism (1) of a roving frame. As shown in FIG. 1, a conventional sliver drawn out from a can (not shown), that is, a sliver ascending the drawing machine, that is, a non-twisted A fiber bundle (2), is as known, a sliver rod (not shown), a special trumpet (3). ),
A positively rotating bottom back roller (not shown; the bottom side rollers are omitted in the figure below) and a top back roller (4) that is driven to rotate by being pressed into contact therewith.
A pair of rollers, a positively rotating bottom middle roller and a pair of top middle rollers (6) that are driven to rotate by pressingly contacting them through upper and lower aprons (5), and a positively rotating second bottom front roller. And a roller pair of the second top front roller (7) which is pressedly contacted with the roller and driven to rotate, and a first bottom front roller which is positively rotated and a roller of the first top front roller (8) which is pressed to contact the roller and driven to rotate. Through the pair, sequentially undergoing a drafting action by each roller pair having different peripheral speeds, and then leaving the roller pair of the first top front roller (8), and then twisted by a flyer (not shown) to produce a roving ( 9).

In the above known draft mechanism (1),
The core components of the method of the present invention are the structure of the special trumpet (3) and the twisted B fiber bundle (10) supplied thereto.

That is, the special trumpet (3) is shown in FIG.
As shown in, the elliptical opening with a long axis in the horizontal direction (1
Both the A-trumpet (12) having 1) and the B-trumpet (14) having an opening (13) smaller than the A-trumpet and having an ellipse or a true circle having a long axis in the vertical direction. (15) The support rod B (16) is integrally fixed, and after fixing, this is mounted on the supply side (17) of the rough spinning frame draft mechanism (1).

The elliptical opening (11) has the above-mentioned A
The fiber bundles (2) have passed and, as is well known, serve for fiber bundles. On the other hand, a twisted B fiber bundle (10), for example, a roving roving, or a twisted lightweight sliver passes through the opening (13) of the B trumpet (14) and lays flat on the A fiber bundle ( 2) is continuously supplied to approximately the center in the width direction, and thereafter both the A and B fiber bundles (2) (10) are simultaneously subjected to the drafting action on the same drafting mechanism (1),
Then, the yarn is twisted by a fryer (not shown), and the B fiber bundle (10) constitutes a core yarn and the A fiber bundle (2) constitutes a core yarn roving yarn having a sheath portion.

As can be understood from the above process, both the A fiber bundle (2) and the B fiber bundle (10) are subjected to the drafting action, so that the fibers constituting the sheath portion are synthetic fiber fibers and / or It is necessary to use staple fibers such as natural fibers, and the fibers of the core portion are preferably the above-mentioned staple fibers. A mono- or multi-filament may be used as the fiber of the core portion, but in this case, since the A fiber bundle (2) slides on the working surface in the draft mechanism of the roving machine, it is necessary to take measures against various troubles caused thereby. Is. The ratio of the B fiber bundle (10) to the total weight is in the range of 10% to 40% by weight, and if the weight ratio is less than 20%, the advantage of the core-sheath structure cannot be obtained, and if it exceeds 50%. If the coverage is low and the spinning condition is not very stable, there is a risk that exposed parts will partially appear.

In short, the method of the present invention uses a special trumpet having a two-stage structure so that the relative positions of the two kinds of fiber bundles A and B supplied to the draft mechanism do not change, and the B fiber among the fiber bundles supplied. Since the bundle (10) is twisted, it does not spread in the draft zone and is subjected to the drafting action according to the width at the time of feeding, while the A fiber bundle (2) is nearly untwisted, so it becomes thinly spread in the draft zone. ..

However, the fiber fleece that has exited the draft mechanism under the drafting action is the fleece of the A fiber bundle (2) having a constant width and the B fiber bundle (1 of the narrower width than that.
When the fleece of (0) is doubled and the B fiber bundle (10) is positioned in the center of the A fiber bundle (2), and then twisted by a fryer of the roving frame, the B fiber bundle (10) is cored. The A fiber bundle (2) covers the surface, and the roving yarn for core yarn is formed.

[0016]

[Specific Examples] Specific examples will be described below. A sliver of 100% cotton (2.78 g per m) is used as the A fiber bundle (2), and a roving yarn (1.19 g per m, twist number: 19.90 g) made of polyester fiber having a fiber length of 38 mm is used as the B fiber bundle (10).
0T / M) was used to produce roving using the apparatus shown in FIG. The spinning condition of the roving frame is 600 r for the fryer.
/ M, draft 7.00 times, twist number 39.4 T / m, roving weight was 0.576 g / m. This roving yarn has a two-layer structure in which polyester fibers are located at the center and the surface thereof is covered with cotton fibers, that is, a core yarn roving yarn. When this was supplied to a spinning machine and a 30th (English count) core yarn was spun out, a core-sheath structured yarn of 30% polyester and 70% cotton was obtained.

[0017]

As described in the above examples, according to the method of the present invention, it is possible to easily produce a core-sheath two-layer structure roving. A core yarn spun yarn can be easily obtained without causing the problems described above.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a perspective view showing a main part of the apparatus shown in FIG.

[Explanation of symbols]

 1 Draft Mechanism 2 A Fiber Bundle 3 Special Trumpet 4 Top Back Roller 5 Top Apron 6 Top Middle Roller 7 Second Top Front Roller 8 1st Top Front Roller 9 Rough Thread 10 B Fiber Bundle 11 Opening 12 A Trumpet 13 Opening 14 B Trumpet 15 Support rod A 16 Support rod B 17 Supply side

Claims (1)

[Claims] 1. A oval opening having a horizontal major axis.
A special trumpet (3) having a trumpet (12) at the bottom, an ellipse or a true circle having a long axis in the vertical direction, and a B trumpet (14) having an opening smaller than that of the A trumpet at the top is a rough spinning frame draft mechanism. Provided on the supply side (17) of (1), the untwisted A fiber bundle (2) is provided in the A trumpet (12), and the twisted B is provided in the B trumpet (14).
The fiber bundle (10) is supplied, and both the A and B fiber bundles (2) (1
0) is simultaneously drafted by the same drafting mechanism (1), the B fiber bundle (10) is positioned substantially at the center of the flat A fiber bundle (2) in the width direction, and the B fiber bundle (10) is placed. A method for producing a roving for a core yarn, which comprises twisting and spinning the whole so as to wrap it.