JPS6212329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel composite yarn. The present invention also relates to a yarn with improved twist density.

More specifically, one yarn with uneven twist density is used as a component yarn, and two component yarns are aligned,
The present invention relates to a composite yarn in which the component yarns are combined by having a yarn portion in which the component yarns are intertwined with each other in at least one portion along the yarn axis.

Conventionally, yarns with uneven twist density, that is, yarns with uneven twist density along the yarn axis, are well known. In particular, an alternately twisted yarn in which S and Z twists are alternately arranged is a notable example of a yarn with uneven twist density.

Twisted density uneven yarn is a fabric that exhibits a unique pattern created by yarn unevenness caused by changes in the texture and twist density of the twisted yarn, and is highly valued for its value.

Furthermore, in the formation of yarns with uneven twist density, especially alternately twisted yarns, the twisting efficiency is higher than in the formation of real twisted yarns, and the value is high from the viewpoint of productivity.

However, when yarns with uneven twist density are subjected to tension, the twist density tends to become uniform along the yarn axis.In particular, when yarns with alternate twist density are subjected to tension,
The twists of the S-twisted yarn portion and the Z-twisted yarn portion along the yarn axis cancel each other out, showing a tendency to change to a non-twisted yarn. In addition, if the yarn has a turning force that correlates with the twist density along the yarn axis, simply leaving it in a free state without being constrained by the side of the yarn will cause it to be free from any particular tension. also shows a tendency to change in the same way as above. Therefore, in such yarns, the difference in twist density decreases during the time from when the yarn is formed until it is wound up, during the weaving and weaving preparation process, and furthermore during the weaving and weaving process until it is formed into a fabric. However, it is extremely difficult to maintain the formed twist density difference until after the fabric is formed, and the intended purpose has not been fully achieved.

In the past, many attempts have been made to avoid the above problems, but all of them have been insufficiently effective. For example, there is a method of applying heat treatment or the like to weaken the turning force corresponding to the twist density, but even if such a treatment is applied, it has almost no effect on the effect of tension. Furthermore, there is a method of bonding the constituent fibers of the yarn to each other by strengthening heat treatment or attaching other components to the yarn. This method is more effective in maintaining uneven twisting as the degree of adhesion and fusing is stronger against the action of tension, but on the other hand, the texture of the twisted yarn is impaired and the yarn is hardened, making it undesirable. It becomes something that does not exist.

In view of the deficiencies of the conventional techniques as described above, the present inventors conducted intensive research to obtain yarns with excellent twist density, and as a result, they were able to achieve their goal by interlacing and compounding yarns with uneven twist density. This is what led us to provide it here.

That is, the composite yarn of the present invention is a composite yarn consisting of two constituent yarns, one of which has a twist density that changes along the yarn axis and is intermittently intertwined in an open state. A multi-filament yarn having a yarn portion that is interwoven, and the other constituent yarn has a substantially uniform twist density along the yarn axis, and is intertwined in at least one portion in an open state. It is a composite yarn characterized in that it is a multi-filament yarn having sections.

The present invention will be explained in more detail below.

In the present invention, the twist density changing along the yarn axis means that the twist density distribution is not uniform or uniform, and includes yarns with alternate twists and yarns with only unidirectional twists. This refers to yarns in which the twist density of the twists added to the yarn during the twisting process is actively varied, such as yarns whose twist number distribution is not uniform. For those with alternating twist, S twist, Z twist
The fiber may have zero twist (no twist) or may have a total twist. In addition, both alternately twisted and unidirectionally twisted pieces may include a part of non-twisted parts. Yarns whose twist density does not change along the yarn axis include yarns that are substantially untwisted, such as ordinary multifilament yarns and their false twisted yarns, and yarns that are normally constantly twisted. includes those with uniform twist density.

In addition, multi-filament yarns include multi-filament yarns, their processed yarns (filament fiber bundles), spun yarns (stable fiber bundles), fiber bundles that mix or combine stable fibers and filament fibers, etc. It refers to a thread composed of fibers.

Furthermore, in the present invention, constituent yarns refer to individual yarns constituting a composite yarn, and discuss the state of the yarns in the state in which the composite yarn is formed. In composite yarns, the constituent yarns are the above-mentioned multifilament yarns, but there are also cases where some of the constituent fibers form protruding fibers such as loops, snarls, snarls, fluff, etc. Yarns with different strand structures, such as yarns with slabs, yarns with dye differences, yarns with differences in heat shrinkage rates, yarns with differences in strength, yarns with differences in elongation, etc., have different forms and physical properties. Yarns, as well as mixed fiber yarns with differences in heat shrinkage, elongation, strength, color, dyeability, fineness, cross-sectional form, gloss, and other material and physical properties, etc. It's also good. In the present invention, the individual yarns constituting the composite yarn, which are in a state before forming the composite yarn, are referred to as constituent raw yarns, and have a character that is clearly distinguished from the above-mentioned constituent yarns. .

The composite yarn of the present invention is composed of two constituent yarns, and there are differences in heat shrinkage, elongation, strength, color, dyeability, fineness, and cross-sectional shape differences between the constituent yarns. , differences in gloss, other differences in materials, differences in physical properties, etc. are acceptable. The composite yarn may have ply twist, alternate twist, or the like.

In addition, the spread state refers to a state in which other constituent yarns or constituent fibers of other constituent yarns exist between the fibers that make up the own yarn (multifilament yarn). be. Therefore, in the present invention, the composite yarn is characterized by the composite state of the threads constituting the composite yarn in a state where the composite yarn is made into a composite yarn. For example, before compounding, When looking at just one constituent raw yarn, even if there is a part of the yarn that is generally recognized to be opened, the part that is recognized to be opened after compounding. In the case where other yarns or constituent fibers of other yarns are substantially completely absent, the composite yarn is significantly different from the composite yarn of the present invention, and at least does not meet the objectives of the present invention. There are also cases where it is impossible to obtain such an effect. In addition, the non-spreading state refers to a state in which there are no constituent fibers of other constituent threads between the fibers of the own thread. The reason for this will become clear in the following explanation.

Under the above premise, the composite yarn of the present invention is composed of two constituent yarns, one of which has a difference in twist density along the yarn axis, and has an intermittent twist density along the yarn axis. The multi-filament yarn A has yarn portions that are intertwined in an open state, and the other component yarn is substantially free of uneven twisting, and at least one portion along the yarn axis is intertwined in an open state. This is a multi-filament yarn B having a yarn portion of

The multi-filament yarns A and B will be explained in more detail. The multi-filament yarn A is characterized in that it has a twist density difference along the yarn axis and also has yarn portions that are intermittently intertwined in a spread state along the yarn axis. It is. However, the multifilament yarn A is
Although it has yarn portions that are intermittently twisted, there may be other structural portions other than these, that is, the yarn may be intertwined even in the opened state. Opening fibers that cannot be recognized as
It has a non-entangled part, a non-spread/non-entangled part that is neither spread nor entangled, or a non-spread/entangled part (a part that is intertwined only in multi-filament yarn A), etc. It's also good. On the other hand, multifilament yarn B
has a structure in which the fibers are spread and intertwined in a part or the entire area along the yarn axis direction,
If a part of the area has this structure, the structure of the other area is a spread/unentangled part where the fibers are not found to be intertwined even in the spread state, and a non-spread/non-entangled part where the fibers are not found to be in the spread state. It may be a part, or a non-opened/entangled part (a part that is intertwined only in its own constituent yarns), or the like.

However, it is not necessarily necessary that the multi-filament yarns A and B are intertwined in all regions and parts of the part in the spread state; In addition to what we are doing,
For example, unentangled portions and intertwined portions may exist alternately between the spread state portions of one section.

As mentioned above, multi-filament yarns are intertwined in an open state, which means that there are other yarns or constituent fibers of other yarns between the fibers that make up the multi-filament yarn itself. It is confounding under the condition that
Regarding the partner yarn for this opening and entangling, the partner yarn may also be in a state where it is recognized that the fibers are opened and entangled in that part, or alternatively, the partner yarn may be in a state where it is recognized that the yarn is not bundled or entangled. It may be in a state that is recognized as being in an open state.

Regarding the effects of the composite yarn of the present invention, it can be easily made into a high value-added yarn with various characteristics compared to the conventional yarn consisting of a single yarn with uneven twist density. Since it has intertwined yarn portions, it is possible to make it extremely difficult to reduce the difference in twist density between the constituent yarns that have different twist densities. That is, for example, if a twisted yarn part is intertwined with other constituent yarns in an "open state", the twisting of the twisted part is due to the entanglement. Since the yarn is directly bound, changes in twist density are extremely unlikely to occur no matter what action the yarn is subjected to. Furthermore, under such a configuration, there was a difference in twist density on both sides of the thread portion having the twist along the axial direction of the thread, and a difference in twist density that was originally easy to cancel out or disappear. Even if the yarn portion having the difference in twist density on both sides is not directly opened and entangled, the presence of the above-mentioned opened and intertwined portion between them causes the difference in twist density. Through the opening and intertwining part,
Such a difference in twist density is difficult to equalize. The above effects are clearly exhibited in multifilament yarn A having a difference in twist density.

In addition, in the multi-filament yarn A, if there is a difference in twist density on both sides along the axial direction of the yarn at the spread/entangled part, it is assumed that there is a difference in twist density that would otherwise be easily canceled out by canceling each other out. Similarly to the above case, such a difference in twist density is not substantially equalized through the opening/interlacing portion.

In the present invention, it is practical for the twist density difference to be brought about by alternate twisting, and this is also preferable from the viewpoint of productivity as described above.

It can be said that it is desirable that the constituent yarns have no bonding/fusion structure at all, but as long as the structure of the present invention is satisfied, there is no problem even if the constituent yarns have some bonding/fusion structure. .

In the composite yarn of the present invention, the part in the spread state does not necessarily mean the untwisted part, and especially when the constituent yarns are alternately twisted yarns, the constituent yarns are naturally twisted together. In many cases, the fibers are in a self-twisted state, and in that case, it can be said that twist exists in the spread state portion due to ply twisting, alternate twisting, or the like. However, even under such a structure, whether or not a certain portion of the yarn is in an open state can be easily determined by looking at the composite yarn. The presence or absence of twisting of the constituent yarns means the presence or absence of individual twisting of each constituent yarn, and excludes twisting of the entire composite yarn, that is, ply twisting.

In the composite yarn of the present invention, the composite yarn portion of the twisted portion and the spread/entangled portion has a great effect in intertwining and combining the constituent yarns with each other, and this portion has the effect of the twisted yarn. At the same time, the thread is soft and rounded. Further, the composite yarn portion between the opening and entangling portions is extremely effective in uniting the constituent yarns with each other.

The composite yarn of the present invention can be manufactured by the following method.

That is, the method for manufacturing the composite yarn of the present invention is as follows:
The two component yarns are aligned and engaged with an entangling device using fluid jet to entangle the component yarns with each other to form a composite yarn. Here, one of the two constituent raw yarns has a multifilament yarn structure that has a twist density difference along the yarn axis and is not bundled in at least one part, and has the above-mentioned fluid jet entanglement imparting device. The yarn is a multifilament yarn having a yarn portion that can be entangled in the process, and the other component yarn has a multifilament yarn structure with substantially no twist unevenness and at least one portion of which is unfocused. The multi-filament yarn has yarn portions that can be entangled with an entangling device using a fluid jet.

Further, the fluid jet entangling device may have a function of continuously imparting entanglement along the yarn axis of the running yarn, or may have a function of intermittently imparting entanglement. Furthermore, it may also have effects other than confounding.

If the latter component raw yarn has yarn portions that are concentrated in at least one portion, even if the composite yarn is formed using a device that has the function of continuously imparting entanglement, the composite yarn obtained In this case, entanglement may not be imparted in the portion where the bundled thread portions of the two constituent raw yarns are aligned, and entanglement may be imparted intermittently.

When aligning the two constituent yarns, both constituent yarns or one of the constituent yarns may be prepared as a package, or may be continuously introduced from the process of manufacturing the constituent yarns.

When manufacturing the composite yarn of the present invention, the forms of the constituent yarns that can be used and the embodiments of the manufacturing method of the constituent yarns are categorized and explained as follows.

(1): A multifilament yarn having a twist density difference along the yarn axis and a yarn portion that can be entangled in at least one portion along the yarn axis (this yarn has multiple fibers as constituent yarns). (Can be filament yarn A or multifilament yarn B): (1)-(1); Alternate twist: (1)-(1)-(1); Thermoplastic multifilament yarn Obtained by false twisting at high temperature and low tension. Alternate twists are formed repeatedly in the order of the untwisted part, the untwisted part, the overly untwisted part, and the untwisted part. This can be obtained by setting the false twisting temperature to such a level that the non-twisted portions do not fuse together.

(1)-(1)-(2): Obtained by varying the number of false twists during false twisting of thermoplastic multifilament yarn. Methods for varying the number of false twists include, for example, varying the supply fluid pressure using a fluid false twisting device, varying the rotational speed of the spindle using a spindle false twisting device, or using a friction false twisting device. Varying the engagement state with the thread or the thread tension means
Alternatively, there is a method of varying the length of the temporary twisting region.

The yarn has a gentle twist density difference and generally has a long twist cycle.

(1)-(2); Unidirectional twist: (1)-(2)-(1); Obtained by varying the yarn speed when twisting multifilament yarn with a twisting machine. In this case, the yarn is obtained by substantially not twisting the yarn at the highest yarn speed.

(1)-(2)-(2); False-twisted multifilament yarn with a weak alternating twist of fusion is additionally twisted in the twisting direction of the untwisted part to virtually eliminate over-untwisting. Obtained by twisting.

(2): A multifilament yarn having a yarn portion that has substantially no difference in twist density along the yarn axis and can be entangled in at least one portion along the yarn axis (this yarn has a structure Can be multifilament yarn B): (2)-(1); Continuous: (2)-(1)-(1); Ordinary multifilament yarn.

(2)−(1)−(2); Normal false twisted yarn.

(2)-(2); Intermittent: (2)-(2)-(1); A yarn in which multifilament yarns are intertwined in an intermittent manner.

(2)-(2)-(2); Thread made of thermoplastic multifilament threads intermittently fused together.

etc. In addition, each of the above shows representative examples of constituent yarns that can be used in manufacturing the composite yarn of the present invention, and is not particularly limited thereto.

According to the present invention as described above, by interlacing and compounding, it is possible to obtain a twisted density uneven yarn having excellent characteristics that have not been obtained conventionally.
According to the yarn of the present invention, the unique pattern woven by thread irregularities caused by the difference in the texture and twist density of the twisted yarn can be fully exhibited in the desired effect.

Hereinafter, the configuration and effects of the present invention will be explained in more detail with reference to Examples.

Example The following six types of constituent fibers were prepared.

a: An undrawn polyester multifilament yarn (127D-36fil.) with a natural draw ratio of 1.6 times was stretched to 1.4 times and false twisted at a heating temperature of 228°C. A friction type device was used as the false twisting device.

The obtained yarn has an average length of 8 mm and a twist density of 3150T/
m untwisted part and average 18mm, average twist density
It has alternating over-untwisting parts of 1400 T/m. Both ends of the over-untwisted portion (portions close to the untwisted portion) are substantially untwisted, and there is also a central portion with a twist density of 2000 T/m.

When a tension of 25 g was applied to this yarn, the twist density of each portion decreased significantly and the yarn had low tensile strength. Incidentally, when the heating temperature was set to 235° C. or higher, almost no untwisted portions were formed.

b; Polyester multifilament yarn (75D-
36fil.) was false-twisted at a speed of 120 m/min.
However, the fluid injection false twisting device intermittently injects pressurized air by receiving and stopping the supply of compressed air for a time determined sequentially by pseudo-random numbers having a rectangularly distributed population between 0.50 and 1.00 seconds.

The obtained yarn was an alternately twisted yarn with a period of 2 to 4 m, the boundary between the S twist portion and the Z twist portion was untwisted, and the twist density changed gently.

c; The heating temperature was set at 235°C in the production of component yarn a.
Then, in the twist direction of the untwisted part,
Additional twisting of 985T/m was applied.

The obtained yarn has an average length of 40 mm and a twist density of 3200 T/
It had alternating untwisted portions with a length of m and substantially untwisted portions with an average length of 90 mm.

d; Nylon multifilament yarn (70D-
24fil.).

e; False twisted yarn of d above.

f: Yarn that is weakly intertwined with the above e. A needle was inserted between the constituent filaments with a tension of 14 g applied to this thread, and the distance the needle could move with a force of 3 g was determined. The average value of the reciprocal of this moving distance was 15/m.

2 of the above groups a, b, c and d, e, f
One fiber from each of the two constituent fiber groups was appropriately combined and drawn, and entangled using a fluid jet intermittent entangling device to form a composite yarn. Combinations of constituent fibers include a and d, a and e, a and f, b and d, b and e, b and f, c and d, c and e, or c and f.
Nine types of composite yarns were created.

All of the composite yarns had high shape stability and maintained their shape well even after weaving and weaving.

Claims (1)

[Claims] 1 A composite yarn consisting of two constituent yarns, one of which has a twist density that changes along the yarn axis,
The yarn is a multi-filament yarn having yarn portions that are intermittently spread and intertwined, and the other component yarn has a substantially uniform twist density along the yarn axis, and at least one portion of the yarn is intertwined. A composite yarn characterized in that it is a multi-filament yarn having yarn portions that are intertwined in a spread state.