JPS5921965B2 - Manufacturing method of blended yarn - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to cases where there are two or more fiber materials constituting a thread (including materials of different colors), in which these materials are mixed in a single thread. It relates to a method of manufacturing yarn (hereinafter referred to as blended yarn).

To explain in more detail, the present invention is characterized in that a core fiber having substantially no true twist consisting of two or more layers of different materials is uniformly tightened by two or more types of surface envelope fibers having true twist, so that it looks as if it were on the surface. The present invention provides a method for producing a blended yarn that exhibits the same appearance as a homogeneously blended yarn.

The fiber material here means interrupted stable fibers and does not include continuous fibers such as filament fibers.

Furthermore, in this text, the term roving refers to a wide range of supplied fiber raw materials including so-called rovings, threads, slivers, tows, etc.

First, the yarn itself produced by the present invention will be explained.

The yarn produced according to the present invention essentially consists of two or more types of materials, so that each material is layered and separated in a substantially untwisted core, which is the yarn core, without being mixed randomly. It has a structure in which two or more types of fibers are wound spirally from the outside to evenly cover and tighten the fibers.

In this respect, with conventional blended yarn, different types of fiber materials are already mixed randomly in the roving fed to the spinning machine, and as a result, each fiber material is mixed evenly within the spun yarn without maintaining its layered structure. It is in a state.

Of course, in most cases, it is desirable that the various fiber materials are evenly mixed together at least on the outer surface of the blended yarn.

This is because if the layered, separated fiber material is exposed to the outer surface, defects such as uneven dyeing, uneven twisting, uneven luster, etc. will become noticeable and the economic value of the product will decrease.

In the blended yarn produced by the present invention, the core, which is the yarn core, is divided into layers for each fiber material as described above, but the surface envelope fibers covering the outer surface are evenly covered with two or more types of materials and wound. It has an appearance similar to that of a homogeneously blended yarn.

Furthermore, since the yarn produced according to the present invention has a core separated into layers of different materials, if these materials have different heat shrinkage rates, applying heat to the finished yarn will cause the yarn to shrink. The entire yarn is bent and crimped, making it possible to obtain a fluffy yarn that has a very different feel from ordinary yarn.

Furthermore, the yarn produced according to the present invention is a yarn consisting of a substantially untwisted core and surface-enveloped wound fibers protruding from the core or existing apart from the core; Twisting is also observed in the core bundle, but the amount is small and is an alternating S and Z twist with a net twist count of virtually zero in terms of twist direction.

Therefore, the core alone has almost no strength as a thread, but in reality, the surface enveloped fibers wrapped around the core in a helical shape tightly tighten the core, and the frictional force generated by this causes the thread to have sufficient strength. becomes.

According to the present invention, in addition to supplying fiber materials with different heat shrinkage rates as rovings as described above, for example, rovings made of 100% polyester fiber and rovings made of 100% cotton are adjusted to appropriate counts and supplied. By doing so, a polyester/cotton blend yarn having an arbitrary blending rate can be obtained.

Such a blended yarn is possible in the present invention by combining all kinds of stable fibers.

Fiber materials that may constitute the present invention include all synthetic and natural fibers as well as combinations thereof.

For example, natural fibers include cotton, wool, silk, ramie, flax, jute, hemp, etc., and synthetic fibers include polyester, polyamide, acrylic, cellulose polyethylene such as acid cellulose, polypropylene, polyvinyl, etc.

The yarn produced according to the present invention is a blended yarn obtained by supplying roving yarns of "different materials," and examples of the "different materials" include all of the above-mentioned "types of stable fibers." This includes cases where fiber length, fineness, gloss, grade, elastic modulus, etc. are different.

Also included are cases where other elements are the same and only the coloring is different.

-The blended yarn obtained by supplying rovings of different colors has particularly high economic value (, >.

This is because yarns made by blending materials of different colors provide fabrics with a far superior aesthetic appearance than those produced by yarn dyeing or fabric dyeing. This is because, together with the increased number of processes, the complexity of process control, and the difficulty of perfect mixing, it is sold as a very expensive yarn.

In this respect, according to the present invention, there is no need to mix dyed tops and rovings in the pre-spinning process, and the rovings of a single color can be adjusted to appropriate counts and fed to the blending device of the present invention, which will be described later. It is possible to obtain a yarn with a blending ratio of .

This is where the invention shows its advantages.

That is, in the blended yarn produced according to the present invention, the core, which is the yarn core, is divided into layers for each fiber material as described above, but the surface envelope fibers covering the outer surface are wound evenly over the entire length, This is because it exhibits the same appearance as a homogeneously blended yarn in the pre-spinning process, so it can be used in the market as a completely blended yarn.

The yarn produced by the present invention is completely new in the above respects and has no parallel in the prior art.

Techniques that are considered to be relatively closely related to the present invention are disclosed in Japanese Patent Publication No. 43-28250 and Japanese Patent Application Laid-Open No. 49-124342.

In other words, these techniques can be summarized as ``a stable fiber bundle or filament yarn is false-twisted, other stable fiber bundles are sucked by suction airflow without being false-twisted, and then
When these plurality of fiber bundles are combined and false twisted at the same time, an open end is formed in one fiber of the stable fiber bundle that is being sucked by the suction air flow, and an open end is formed in one fiber of the stable fiber bundle that is being sucked by the suction air flow, and the fiber bundle is A method for manufacturing and crushing a spun yarn product characterized by winding the open ends of the fibers around a fiber bundle body.
However, in this technique, untwisted stable fibers are wound around a fiber bundle that is already in a false-twisted state, and it is always one fiber on the untwisted side that can create an open end. Since the method is limited to bundles, only a core bundle made of a single material and a yarn consisting of wrapped fibers surrounding this core can also be obtained (G).

Next, a yarn manufacturing apparatus for carrying out the present invention will be explained.

That is, the apparatus for carrying out the present invention is intended to realize a mixed spinning operation in a spinning machine by supplying rovings made of different materials.

Blending generally refers to mixing different types of fibers in the pre-spinning process and using the resulting Shino yarn to make yarn in the spinning process, but in blending, there should be no unevenness and the different types of fibers should be homogeneous. It is required that they be mixed.

However, it is actually extremely difficult to homogeneously mix fibers with different materials and physical properties.

This is because the blending carried out in the pre-spinning process is generally carried out in the continuous process, but in the subsequent roving and spinning process, including the continuous process, the roving is always subject to draft, and different types of fibers are drafted together. In this case, draft unevenness occurs due to differences in fiber length, fineness, friction coefficient, rigidity, etc. of the synthetic fibers, which causes yarn unevenness and blended yarn unevenness.

Therefore, in the industry, it is currently possible to blend only fibers with similar properties, and the range of combinations of fibers that can be blended is severely limited.

The present invention aims to eliminate the limitations in blending technology resulting from the drawbacks of these conventional spinning methods, and to perform blend spinning on a spinning machine without causing draft unevenness for any combination of materials.

The spinning device for carrying out the present invention includes drafting rolls that individually and continuously draft two or more rovings, and a fleece drawn by the drafting rolls, that is, a fiber bundle with open ends, in one direction. a false twisting nozzle N2 for combining the fleece into yarn by applying pseudo twisting;
The untwisting nozzle N1 generates pseudo-twisting in the opposite direction to the twisting direction of the false-twisting nozzle N2, which attempts to untwist the pseudo-twisting that advances to the union point of the fleece. It consists of a winding mechanism for winding up the unraveled thread.

The principle of blending in the above-mentioned apparatus will be explained in the following examples with reference to the drawings.

FIG. 1 is an overall side view of the device.

Roving S1. S2 is a drafting roll group 1, 1', 2, 2',
3 and 3', and are sent out while being drafted separately and proceed in the opposite direction of arrow X.

In order to apply a preliminary brake draft with the back rollers 1, 1', the circumferential speed of the middle roller 2.2' is set to 1.1 to 1.9 times the circumferential speed of the back rollers 1, 1'.

This magnification is called the brake draft ratio and must be increased if the number of twists in the roving is thick.

The roving S, which has slipped between the fibers due to the brake draft, advances while being sandwiched between the aprons 4 and 4' that run due to the rotation of the middle rollers 2 and 2', and rotates at high speed when it comes out of the apron. It is sandwiched between the front rollers 3, 3, and is pulled out by the amount equivalent to one thread through the nip formed by the apron and sent out.

Immediately after the front roller there is an untwisting nozzle N, and the untwisting nozzle N1 has an airflow swirling cylindrical injection nozzle 5 and an air reservoir 6.
, compressed air inflow hole 7.

The injection nozzle 5 is tangentially opened in the tube wall of the airflow swirling cylinder 8.

Compressed air enters the air reservoir 6 from the inlet hole 7 and is ejected from the pore of the injection nozzle into the airflow swirling cylinder 8, and the swirling airflow is sent to the outlet 10.
erupt from.

Therefore, the fiber introduction hole 9 becomes a negative pressure and the front roller 3
, 3', the fleece or fiber bundle having open ends is drawn into the cylinder 8, rotated by the swirling airflow, and twisted.

During normal operation, the twisted yarn subsequently passes through the false twisting nozzle N2 and is untwisted, then pulled out by the pick-up roller 11, 11' and wound up by a known winding device (not shown).

The structure of the false twisting nozzle N2 is almost the same as the structure of the untwisting nozzle N1, except that the ejection direction of the ejection nozzle, and therefore the direction of twisting the yarn, is opposite, and there are differences in the diameter of the ejection nozzle and the length of the cylinder 8. Due to the difference, the rotational force exerted on the yarn is
The point that is determined so that 2 is larger is the untwisting nozzle N.
The structure is different from 1.

During continuous spinning, the pseudo-twist added to the yarn rotated by the swirling airflow from the false-twisting nozzle N2 advances in the direction of arrow X, passes through the cylinder 8 of the untwisting nozzle N, and forms a fleece or an open thread. Merging point 12 of the fiber bundle with end 13.13'
The twist corresponding to the difference in twist that escapes due to the progress of the yarn from the twist caused by rotating the joining point is further transmitted beyond the joining point 12 to the vicinity of the nip point of the front roller.

In this case, it is undesirable for too much twist to be transmitted beyond the merging point 12.

However, in order to finally form a yarn, the false twisting nozzle N2
It is necessary to untwist the material sufficiently, and in turn, it is necessary to generate a strong pseudo-twist using the false-twisting nozzle N2.

Therefore, if no precautions are taken, excessive twist will be transmitted to the coalescing point and will prevent yarn formation.

Therefore, the untwisting nozzle N1 is provided in order to reduce the transmission of twist to the joining point while maintaining the heating power of the false twisting nozzle N2.

Therefore, the direction of ejection from the untwisting nozzle N1 is opposite to the direction of ejection from the false-twisting nozzle N2, and the somewhat untwisted and weakened twist of the false-twisting nozzle N2 is transmitted beyond the merging point.

The above is the overall situation for manufacturing yarn with this apparatus.

Next, the principle of blending in this apparatus will be explained in detail.

To perform blend spinning with this device, different types of rovings are fed from the back roller.

The number of different types of rovings may be two or more. Here 2
81. Explain this supply and refer to it as 81. Let it be S2.

For ease of understanding, a plan view of the apparatus with the top roller 1.2.3 and apron 4 removed is shown in FIG.

Roving S1. S2 is drafted by a roller group consisting of a back roller, a middle roller, and a front roller, and the front roller 3,
It passes over the nip line AA of 3'.

Since the front rollers 3' and 3 are rotating at high speed, the accompanying airflow on the peripheral surface of the rollers becomes a flow in the axial direction of the front rollers at the nip line AA, and the fiber bundles S1. It acts to open S2.

Opening the fiber bundle means that some fiber ends of the fiber bundle that have been made parallel are separated from the fiber bundle by the force of the airflow, and their heads are exposed, thereby preventing the parallelism of the fiber bundle.

The protruding fiber ends 13 and 13' in FIG. 2 are opened fiber ends, that is, open ends.

The open ends thus generated ultimately form a surface envelope of the yarn, giving it the appearance of a symmetrical blended yarn.

In this way, in this device, the braiding yarn S1. Since S2 is drafted separately, the physical properties (fiber length, fineness, coefficient of friction, etc.) in each roving are uniform, and the roving in which different types of fibers are mixed, as in the case of conventional blended roving, is drafted. Draft spots will not occur because the material is not exposed to the surface.

The twist from the false twisting nozzle N2 is transmitted to the fiber bundles 14, 14', that is, the above-mentioned fleece, drawn out including the open ends by the rotation of the front roller, and the fiber bundles advance to the coalescence point 12 while rotating.

However, the twist from the false twisting nozzle N2 is only transmitted to the core portion of the fibers, and the long open ends that protrude almost do not wrap around the core even when the fiber bundle rotates, but simply spin around idle.

The fiber bundles made of different materials that have reached the merging point in this way are completely combined by twisting from the false twisting nozzle N2 and are pseudo-twisted.

At this time, the open ends 13, 13' remain protruding like long fluffs.

This state is shown in FIG.

Black fiber bundles indicate fiber bundles starting from 14, and white fiber bundles indicate fiber bundles starting from 14'.

The open end 13,
13' occurs, the open end 13°13 in the combined state is also the roving S1. The items from S2 are evenly mixed together.

The fiber bundle thus pseudo-twisted is then exposed to the action of the untwisting nozzle N1, but since the ejecting direction is opposite to the direction of the pseudo-twisting from the false-twisting nozzle N2, the force of this airflow causes the fiber bundle to become fluffy. Open end 1 that stood up
3.13' results in wrapping around the outer periphery of the core in a direction opposite to the direction of twist of the core.

In this way, the open ends 13, 13' are relatively lightly wound around the core fiber bundle when they pass through the untwisting nozzle N1, but when they pass through the false twisting nozzle N2 and the core is completely untwisted. The open end, which was lightly wrapped around the outer periphery of the core, rotates as the core untwists, and is forcibly and firmly wrapped around the fiber bundle of the core.

When the core fiber bundle is completely untwisted in this way,
A yarn according to the invention is produced.

To describe in more detail the yarn of the present invention produced through the above manufacturing process, first, the fiber bundles excluding the open ends 13 and 13' are twisted and combined in a certain direction at the coalescing point 12 to form the core of the thread. , the core of this yarn is the roving S1. The fiber bundles 14 and 14' originating from S2 are twisted together, and the roving S
The fiber bundle F1 is made of the same material as the fiber bundle F1, and the fiber bundle F2 is made of the material of the roving S2.

Then, when passing through the untwisting nozzle N1, the fiber layer F1. The open ends 13 and 13' from both fibers are evenly wound around the yarn core made of F2, and when it passes through the false twisting nozzle N2, the twist of the yarn core is untwisted and becomes substantially untwisted. At the same time, the open ends 13, 13' wound around the yarn core are more tightly wound around the yarn core in a helical shape, forming a surface envelope in which the fibers 14 and 14' are evenly mixed.

Therefore, if we focus on a single fiber that makes up this surface envelope, one end of this fiber is embedded in the core and forms a core fiber bundle, and the other end goes outside the core and forms a core bundle as the surface envelope. It acts as a constrictor.

Although the amount is small, the fibers that have come loose at both ends are also wrapped around the surface.

On the other hand, since this open end 13.13' is wound around the core several times in a helical pattern, the two types of fibers appear to be wound in a random or evenly mixed manner, and a complete blend is not formed on the outer surface. It will be completed.

Further, after passing through the false twisting nozzle N2, the core portion is stepped back and becomes substantially untwisted, but the fiber bundles made of each material constituting the core remain separated and exist in layers.

These conditions will be explained with reference to FIG. 4, which shows the cross-sectional structure of the completed thread.

In FIG. 4, the black clay indicates the cross section of the fiber F1 produced from the roving S1, and the white dot indicates the fiber F2 formed from the roving S2.

The dashed-dotted line indicates the boundary surface of the fiber layers constituting the core.

Further, the broken line indicates the boundary between the core bundle and the surface envelope fiber.

However, since some of the surface envelope fibers and the core fibers are in a continuous state, the boundary between them cannot be completely separated, and the broken line shows the boundary line as a rough guide.

The above structure of the yarn produced according to the present invention works similarly even when rovings of two or more different colors are supplied.
It is clear from FIG. 4 that it is possible to obtain a yarn with a surface envelope in which these colors are homogeneously mixed.

The novelty and practicality of the various products of the present invention are clear from the description of the examples and drawings, but the main advantages of the present invention are summarized as follows.

■、Production speed is high.

2. A homogeneous blended yarn with no spots can be obtained.

3. A dyed thread that is evenly mixed can be obtained.

4. Fine count yarn can be easily produced.

5. A fluffy yarn with crimp is obtained.

The greatest advantage of the present invention is that the spinning machine produces a completely uniform blend on the surface.

Also, is the core of the manufactured yarn separated into layers? 'It's also a big advantage.

In other words, as mentioned above, by using fiber materials with different heat shrinkage rates, a crimped yarn can be obtained, and if one of the layers uses fibers with a high coefficient of friction, a yarn with high strength is naturally obtained, which can be easily applied in the subsequent process. becomes extremely easy.

[Brief Description of the Drawings] Fig. 1 is a front view showing the structure of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a view showing the appearance of yarn in the process of being produced, and Fig. 4 is a cross section of the produced thread. FIG. 3.3'...Front roller, 12...
・Union point, 14.14'... Core fiber bundle, 13
．． 13'...Open end, N1...Untwisting nozzle, N2...False twisting nozzle, S. Sl, S2......Rough yarn.

Claims (1)

[Claims] Rovings made of 12 or more different fiber materials are individually drafted by a drafting roller in a state where they are separated from each other, and open ends are created evenly in each of the fiber bundles by the accompanying airflow of the drafting roller. At the same time, each fiber bundle is immediately merged immediately after the drafting roller and introduced into one untwisting nozzle, and after being combined and twisted in a certain direction by the untwisting nozzle, the fiber bundles that have been combined and twisted are further subjected to the above-mentioned 1. A method for producing a blended yarn, which comprises using another false twisting nozzle that imparts false twist in a direction opposite to that of the untwisting nozzle.