JPS6212331B2 - - 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, a yarn portion in which two yarns with uneven twist density are used as constituent yarns, the two constituent yarns are aligned, and the constituent yarns are intertwined with each other in at least one portion along the yarn axis. The present invention relates to a composite yarn formed by combining the component yarns with each other.

Conventionally, yarns with uneven twist density, that is, yarns with uneven twist density along the yarn axis, are well known. In particular, alternatingly twisted yarns in which the S and Z twists alternate are a notable example of yarns 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 twisting force that is correlated with the twist density along the yarn axis, simply leaving it in a free state without being constrained from the side of the yarn will not cause it to receive 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 and fusing the constituent fibers of the yarn to each other by strengthening heat treatment or attaching other components to the yarn. This method is effective in maintaining the change in twist density as the degree of bonding and fusing is stronger against the action of tension, but on the other hand, the texture of the twisted yarn is lost and the yarn is hardened. It becomes undesirable.

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, both of which have uneven twisting along the yarn axis, and are intermittently spread along the yarn axis. It is a multi-filament yarn having yarn parts intertwined with each other, and furthermore, along the yarn axis of the composite yarn, one of the constituent yarns is spread and intertwined in the yarn part, and the other constituent yarn has a twist. It is a composite yarn characterized by being in a non-spread state.

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 total number of twists may be zero (no twist),
Alternatively, it may be completely twisted. 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, multifilament yarns include multifilament yarns, their processed yarns (filament fiber bundles), spun yarns (staple fiber bundles), and fiber bundles that use a mixture or combination of staple fibers and filament fibers. It refers to threads made 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 the composite yarn, the constituent yarn is the above-mentioned multifilament yarn, but in addition, some of the constituent fibers form protruding fibers such as loops, snarls, snarls, fluff, etc., along the yarn axis direction, Differences in form and physical properties of yarns that change in structure, 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. In addition, yarns with different heat shrinkage, elongation, strength, color, dyeability, fineness, cross-sectional form, gloss, and other materials and mixed fiber yarns with different physical properties, etc. It is good to have it.

In the present invention, the individual yarns constituting the composite yarn in a state before forming the composite yarn are referred to as constituent raw yarns, and are clearly distinguished from the above-mentioned constituent yarns. be.

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. Accordingly, in the present invention, the composite yarn is characterized by the composite state of the yarns constituting the composite yarn in the state where the composite yarn is formed, for example. If we look at just one constituent raw yarn before compounding, even if there is a part of the yarn that is generally recognized to be spread, it is not possible to find that the fibers are spread after compounding. If the observed portion is substantially free of other yarns or constituent fibers of other yarns, the composite yarn is significantly different from the composite yarn of the present invention, and at least The effects aimed at by the present invention cannot be achieved at all. 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, both constituent yarns have a difference in twist density along the yarn axis, and have intermittent twist density along the yarn axis. It is a multi-filament yarn that has yarn parts that are intertwined in an open state, and further, along the yarn axis of the composite yarn, one of the constituent threads is intertwined in an open state, and the other constituent thread is It is characterized by having a twist and being in an unspread state.

To explain this composite yarn in more detail with reference to drawings, etc., the two multi-filament yarns constituting the composite yarn have different twist densities and are intermittently intertwined in an open state, as described above. Therefore, the multifilament yarn has yarn portions that are intermittently twisted.

1 to 4 are model diagrams for explaining the composite yarn of the present invention, and FIGS. 1 and 3 are model illustrations of the constituent raw yarns.

In Figures 1 and 3, the yarn model 1,
2, 3, and 4 all take alternately twisted yarn as an example, and there is a non-twisted/non-focused part B between the S-twisted part A and the Z-twisted part A'. The untwisted and unfocused portion B is in a state where it can be entangled when the yarn is engaged with a fluid jet entangling device. Constituent yarns 1, 2, 3, and 4 are:
It is an alternately twisted yarn, and needless to say, it is a yarn with different twist densities. Constituent yarns 1 and 2 shown in Figure 1
In this case, the pitch at which the untwisted and non-focused portion B appears in the component yarn 1 is substantially equal to the pitch at which the twisted portions A and A' appear in the component yarn 2, and When they are pulled together, in the part where one thread is A or A', the other thread is almost B, and in the part where one thread is B, the other thread is almost A or A'.
This figure shows an example of a combination A' in which the corresponding lengths of A or A' and B are approximately equal in each part.

Constituent yarns 3 and 4 shown in FIG.
The pitch at which the untwisted and non-focused portion B appears is substantially equal to the pitch at which the twisted portions A and A' appear in the component yarn 4, and provided that the yarns 3 and 4 are aligned. In this case, in a part where one thread is B, the other thread is A or A', and for the corresponding B and A or A', B is better than A in each corresponding part. Or, it shows an example of a combination that is shorter than A'.

FIG. 2 and FIG. 4 each illustrate the composite yarn of the present invention as a model, and FIG.
A model consisting of constituent yarns 1' and 2', and FIG. 4 is a model consisting of constituent yarns 3' and 4' obtained using constituent yarns 3 and 4 shown in FIG.

In Figures 2 and 4, the area indicated by A/B shows that in the thread part where one of the component yarns is intertwined in the spread state, the other component yarn has a twist and is not in the non-spread state. It's a certain part.

In FIG. 4, the part indicated by C is a part where both constituent yarns have twists and are bundled. In FIGS. 2 and 4, the area indicated by D is a portion where one of the component yarns is twisted and bundled, and the other component yarn is not spread or entangled. In addition, the area indicated by E in Figure 2 is
One of the constituent threads is twisted and bundled, while the other constituent thread is spread but not intertwined. Moreover, the part indicated by F is a part where one of the constituent threads is twisted and bundled, and the other constituent thread is intertwined within its own thread.

In the present invention, composite yarn structure portions such as C, D, E, and F may be used.

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 yarn portions that are opened and intertwined, it is possible to make it extremely difficult to reduce the difference in twist density between the constituent yarns. In other words, the thread part with twist is
When the other constituent yarns are intertwined in the "open state", the twist in the part that has this twist is directly constrained by the intertwining, and the change in twist density depends on what kind of effect it has. Even if the thread is subjected to this, it is extremely unlikely to occur. Furthermore, under such a structure, even if there is a difference in twist density on both sides of the twisted yarn portion along the axial direction, even if there is a difference in twist density that is originally easy to eliminate due to cancellation etc. And, even though the yarn portion having the difference in twist density on both sides is not directly opened and intertwined, since the above-mentioned opening and intertwining portion exists between them, the yarn portion having a difference in twist density on both sides is - It is difficult to equalize such a difference in twist density through intertwined parts. The above is the effect that spreading and entangling has on the mating yarn, but also when looking at the self-thread of a multifilament yarn, there is a difference in twist density on both sides of the yarn in the axial direction of the opening and entangling part. In some cases, even if there is a difference in twist density that is easily eliminated by canceling each other out, as in the above case, such a difference in twist density can be made uniform through the opening/interlacing part. Actually, there is none.

As described above, in the composite yarn of the present invention, fiber opening and entanglement not only have a coalescing effect but also make it extremely difficult to reduce the difference in twist density between the other component yarns, and at the same time, This has the effect of making it difficult to reduce the twist density difference in the yarn.

In the present invention, it is practical that the twist density difference is caused by alternate twisting,
Further, as mentioned above, this case is preferable from the viewpoint of productivity and the like.

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 in cases where alternately twisted yarns are constituent yarns, the constituent yarns are naturally twisted together (self-twisting). ) in many cases, and in that case, it can be said that twist exists in the spread state portion as well, such as by ply twisting or alternate twisting. 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.

In the composite yarn of the present invention, the composite yarn portion consisting of the twisted portion and the opening/interlacing portion has a great effect in intertwining and coalescing the component yarns, and this portion has the effect of a twisted yarn and the yarn is soft. The threads are round.

In addition, if there is a composite yarn part in which the twisted parts are combined, such as part C in Fig. 4, whether it is a combination of S-S, S-Z, or Z-Z, the twisted yarn In addition, the yarn in that part has no roundness and the morphological characteristics along the yarn axis direction are extremely prominent. It is something that has a large morphological difference from the other parts.

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

That is, the two component yarns are aligned and engaged with an entangling device using fluid jet, and the component yarns are intertwined with each other to form a composite yarn. Here, each of the two component yarns has a twist density difference along the yarn axis, and is entangled by the fluid jet entangling device as described above, such as a multifilament yarn structure in which at least one portion is non-focused. It is a multi-filament yarn with yarn sections ready to be applied.

Then, for the yarn portions that are in a state where they can be entangled, the yarns are combined and pulled so that the portions B of the two component raw yarns are in opposite phases, as shown in FIGS. 1 and 3. It is important to have them aligned.

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

In addition, when the bundled yarn portions of the component yarns are aligned in the same part along the yarn axis of the component yarns, the composite yarn is processed using a device that has the function of continuously intertwining the component yarns. Even if a layer is formed, entanglement may not be imparted to the aligned portions, but entanglement may be imparted intermittently.

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

In other words, the twist density difference can be classified into those brought about by the alternating twist state, those brought about by the unidirectional twist state, and those brought about by the unidirectional twist state. Typically, (1): Alternate twist; obtained by varying the number of false twists when false twisting multi-filament yarns. Methods for varying the number of false twists include, for example, varying the pressure of the supply fluid 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. There are means such as varying the state of engagement with the yarn or the yarn tension, or alternatively, varying the length of the false twisting region.

(2): Unidirectional twisting: There is a method in which sufficient initial twisting is performed in advance and then processing is performed in the same manner as the above-mentioned alternating twisting manufacturing method.

Each of the above is a representative example of the constituent yarn that can be used in manufacturing the composite yarn of the present invention, and the present invention 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 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 Two PET multifilament yarns (75D-36fil) are engaged with a supply roller and a fluid jet false twisting device in this order, and then after the two yarns are pulled together, they are engaged with a fluid jet intermittent entangling device and a take-up roller in that order. They were combined to form a composite yarn.

The fluid supply to the two fluid injection false twisting devices was intermittently alternating, and one continuous fluid supply time was set to a random length of 10 cm to 20 cm of the yarn being processed while running.

The obtained composite yarn was relatively uniform even though the constituent yarns were alternately twisted yarns. The entanglements that bind both component yarns existed intermittently along the yarn axis of the composite yarn, and their period was 15 mm on average. Further, it had alternating twists in the form of ply twist, and the alternating twists changed when tension was applied, but the alternating twists of the constituent yarns hardly changed.

Incidentally, in order to leave alternating twists with a high twist density in the constituent yarns, it is advisable to increase the distance to the supply roller and shorten the distance to the fluid jet intermittent entangling device, in addition to depending on the mode and conditions of the fluid jet false twisting device.

[Brief explanation of the drawing]

1 to 4 are model diagrams for explaining the composite yarn of the present invention, and FIGS. 1 and 3 are model illustrations of the constituent raw yarns,
FIG. 2 and FIG. 4 each illustrate the composite yarn of the present invention as a model. 1, 2, 3, 4: Constituent yarn, 1', 2', 3',
4': Constituent yarn, A: S twist part, A': Z twist part,
B: non-twisted/unfocused portion; A/B: portion where one component yarn is intertwined in a spread state, while the other component yarn has a twist and is not spread.
C: A portion where both constituent yarns have twists and are bundled. D: A portion where one of the constituent yarns is twisted and bundled, and the other constituent yarn is not spread or intertwined. E: A portion where the constituent yarns 1' are twisted and bundled, while the constituent yarns 2' are spread but not intertwined.

Claims (1)

[Claims] 1. A composite yarn consisting of two constituent threads, where the twist density of both constituent threads changes along the yarn axis,
It is a multi-filament yarn that has thread portions that are intermittently intertwined in an open state along the yarn axis, and further, one of the component yarns is intertwined in an open state along the yarn axis of the composite yarn. A composite yarn characterized by having a twist of the other component yarn in the yarn portion and being in an unspread state.