JPS5994635A - Composite yarn and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a composite yarn and a method for manufacturing the same.

More specifically, a composite yarn made from a plurality of synthetic fiber yarn bundles with different heat shrinkage rates and a method for producing the same, which, when made into a woven fabric, produces streak-like shiny spots called fludges and exhibits a unique appearance. Regarding.

Conventionally, it has been well known to combine multiple bundles of synthetic fiber yarns with different heat shrinkage rates and then heat treat them to obtain a composite yarn with improved texture and bulk due to the difference in heat shrinkage rates. There is. In such conventional composite yarns, in order to obtain uniform composite yarns, efforts have been made to mix bundles of synthetic fiber yarns with different heat shrinkage rates as uniformly as possible. .

The present inventors went against the common sense of conventional composite yarns,
A composite yarn is created by combining multiple bundles of synthetic fiber yarns with different heat shrinkage rates, and when a woven fabric is created using this composite yarn, streak-like luster spots called fludge occur. The inventors have discovered that a fabric with a unique appearance can be obtained, and have arrived at the present invention.

That is, in the invention of the present application cylinder 1, a plurality of synthetic fiber yarn bundles having different heat shrinkage rates are not aligned, and the blending coefficient of the plurality of synthetic fiber yarn bundles having different heat shrinkage rates is less than so%. Adashi,
It is a composite yarn characterized by having a twist of 2 to 20 T/rn, and the invention of the present invention relates to a composite yarn in which a part of a plurality of synthetic fiber yarn bundles is heat-treated, and the remaining yarn bundle is After making the heat shrinkage rates different without applying heat treatment, each yarn bundle is taken up by a take-up roller while being separated, and after leaving the take-up roller, the yarns are doubled by a doubling guide. This is a method for manufacturing a composite yarn characterized by applying a twist of 2077 m and winding it.

The synthetic fiber in the present invention means thermoplastic synthetic fiber such as polyester fiber and polyamide fiber. In particular, the present invention is suitable for application to polyester fibers, and in particular, at least one yarn bundle among a plurality of yarn bundles is made of polyethylene terephthalate or a copolyester containing polyethylene terephthalate as a main component. Preferably, it is a bundle. Of course, the plurality of yarn bundles may be a combination of fibers made of different types of polymers, such as polyester fibers and polyamide fibers.

The difference in heat shrinkage rate between a plurality of synthetic fiber yarn bundles having different heat shrinkage rates is preferably 4 to 10 times the boiling water shrinkage rate, and particularly preferably 5 to 9%.

The most important feature of the composite yarn of the present invention is that multiple bundles of synthetic fiber yarns with different heat shrinkage rates are aligned and only a slight twist of 2 to 2077 m is applied. The point is that care is taken not to mix the fibers with each other. That is, in the composite yarn of the present invention, it is necessary that the fiber blending coefficient defined below is less than 50%, preferably 30% or less.

Here, the blending coefficient is a parameter that indicates the extent to which a plurality of yarn bundles with different heat shrinkage rates are mixed with each other in the length direction of the composite yarn. When 20 cross-sectional photographs of the yarn sample are taken consecutively at intervals of 5 cIn in the length direction of the yarn sample, A is the number of photographs in which multiple yarn bundles with different heat shrinkage rates are intermingled with each other. , -X 100 (%). An example of a state in which a plurality of yarn bundles having different heat shrinkage rates are intermingled with each other is shown in FIG. 1(a).

The state is as shown in (b) and (c), and the state shown in Figure 1 (
d), (e).

The state shown in (f) is counted as not mixed fibers. In FIG. 1, white circles indicate single fibers constituting a yarn bundle with a high heat shrinkage rate, and black circles indicate single fibers constituting a yarn bundle with a low heat shrinkage rate.

Therefore, the fact that the blending coefficient shows a small value means that there are few areas where multiple yarn bundles with different heat shrinkage rates are mixed with each other in the length direction of the composite yarn. This means that the bundles are arranged in layers.

If this fiber mixing coefficient becomes too large, in other words, if multiple yarn bundles with different heat shrinkage rates are mixed too much, streak-like shiny spots called fludge will occur when woven into a fabric. This does not occur, and the result is no different from conventional composite yarns.

Furthermore, in the composite yarn of the present invention, the number of twists is 2-2077.
m, preferably within the range of 4-1077 m. If the number of twists is too small, multiple yarn bundles with different heat shrinkage rates will separate, resulting in poor processability and weavability, and even streak-like luster spots (fludge) when fabricated.
The length becomes too long, resulting in poor aesthetics. On the other hand, if the number of twists is too large, the length of streak-like shiny flecks (fludges) in the fabric becomes too short, which also results in poor aesthetics.

As a method for manufacturing the composite yarn of the present invention, a part of a plurality of synthetic fiber yarn bundles is heat-treated, and the remaining yarn bundles are not subjected to heat treatment, so that the heat shrinkage rate is anisotropically changed. After tightening,
An example of a method is to take each yarn bundle separately by a take-up roller, and after exiting the take-up P-ra, combine the yarns, give a twist of 2 to 2077 m, and then wind it.

FIG. 2 is a schematic diagram showing an example of an apparatus for carrying out the second invention of the present application, in which a synthetic fiber unstretched package (1)
, (synthetic fiber undrawn yarn bundle (Y
), (Y') is guide (2), (via two, 1
After being supplied to a pair of bure tension rollers (3) and (3') and separated by a separation guide (4), the heating supply roller (
5) and its separate roller (6) several times, the yarn bundle (Y) is brought into contact with the heating plate (7) and heat treated, and the yarn bundle (Y) is wrapped around the heating plate by the guide (8). (7), it is wound several times around a drawing roller (9) and a separate roller (10) without being subjected to heat treatment, and then stretched, and then the thread is twisted around a gold thread guide (11).

In this case, the stretching roller (9) and the seven cut rate roller (
10) corresponds to the take-up roller and is a yarn bundle (Y).

As shown in FIG. 3, (Y') runs on the stretching roller (9) and the separate roller (10) in a separated state, and is made to be doubled for the first time by the gold thread guide (11). Immediately after heat treatment or by doubling on the drawing roller (take-up roller) (9), the yarn bundle (Y) and the yarn bundle (Y
') It becomes difficult to obtain a composite yarn with a mixing coefficient of less than 50, in which the single fibers tend to mix with each other.

As the gold thread guide (11), it is preferable to use a 7-shaped grooved guide in order to obtain a good fludge and to perform production in a stable state.

In this case, the surface roughness of the groove (12) of the doubling guide (7-shaped grooved guide) (11) is preferably selected within the range of 1.5S to 3S. When the surface roughness of the groove (12) is out of the above range, there is a tendency for yarn breakage due to winding on the drawing roller (take-up roller) (9) to occur, and production in a stable state tends to be hindered. It will be done.

The thus-combined yarn passes through the rabbet guide (13) and is placed on the bobbin () attached to the spindle of the ring twisting machine.
14) is twisted and wound.

The number of twists at this time is 2 to 20 T/m, preferably 4 to 20 T/m.
10 T/m. If the number of twists is too small, multiple yarn bundles (Y) and (Y') with different heat shrinkage rates will separate, resulting in poor processability and weavability, and furthermore, the length of the fludge when fabricated. The hair becomes longer and the aesthetics deteriorate. On the other hand, if the number of twists is too large, the length force and short force λ of the fluff when made into a woven fabric becomes too large, resulting in poor aesthetics.

Note that it is necessary to thread the yarn bundles (Y) and yarn bundles (Y') using the l/zu doubling guide (11), and directly attach the threads to the rabbet without using the doubling guide (11). If the yarn is guided to the guide (13) and twisted, the occurrence of yarn breakage due to winding on the drawing roller (take-up roller) (9) increases significantly, making it impossible to maintain stable productivity.

As described above, according to the first invention of the present application, it is possible to provide a composite yarn which, when woven in a uniform manner, generates streak-like glossy spots 75 called fludges and exhibits a unique aesthetic appearance. It is extremely effective in diversifying products and increasing added value. According to the second invention of the present application,
The composite yarn of the first invention of the present application can be produced extremely stably.

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

Examples 1-7. Comparative Examples 1 to 4 A pair of packages of polyethylene terephthalate undrawn filament yarn (150 denier/36 filaments) spun and wound at a spinning speed of 1300 rr/min was drawn at a drawing ratio of 3.0. Stretching roller (9)
peripheral speed of 800 rrL/%.

The surface temperature of the heating roller (5) is 80°C, the heating plate (7
) is stretched and heat treated at a surface temperature of 200°C, and one of the two polyethylene terephthalate yarn bundles (Y') is separated from the heating plate (7) by a guide (8) and heat treated. The other yarn (Y) is heat-treated to prevent the yarn bundles (Y) (Y') from overlapping on the drawing roller (9), and the yarns are combined using a gold thread guide (11) and then passed through a ring twisting machine. It was wound onto a bobbin (14) attached to a spindle.

By adjusting the flow rate of compressed air supplied to the nozzle, in this case the doubling guide (11) and the labet will no longer have a fluffing effect, resulting in poor aesthetics. In addition, the number of twists is 2 T
If it is less than /+n (Comparative Example 3), the fludge becomes too long and is not suitable.
Y) and (Y') separate into each component, resulting in poor processability and
Manufacturing f & quality 75 deterioration. On the other hand, if the number of twists exceeds 20 T/In (Comparative Example 4), the length of the fludge becomes too short, resulting in poor aesthetics.

Comparative Examples 5 and 6 In Example 1, when the doubling positions of the yarn bundle (Y) and the yarn bundle (1'') were variously changed, the results shown in Table 2 were obtained.

Table 2 From this result, it is clear that the position where the yarn bundle (Y) and the yarn bundle (Y') are combined should be after exiting the drawing roller (take-up roller) (9). .

Comparative Example 7 In Example 1, the single dowel guide (11) was not used, and the yarn bundle (Y) and the yarn bundle (f) were directly passed through the lappet guide (1
When the yarn was guided and twisted in step 3), the yarn was frequently wrapped around the drawing roller (take-up roller) (9), and the yarn breakage rate reached 26%. In Example 1, in which Y')7 was doubled by the yarn doubling guide (11) and then guided to the lappet guide (13) and twisted, winding the yarn around the drawing roller (take-up roller) (9) was as follows. This rarely occurred, and the thread breakage rate was only 0.6.

Examples 8 to 11 In Example 1, the experiment was repeated by changing the surface roughness of the groove (12) of the V-shaped grooved guide (11) as shown in Table 3. The thread breakage rate at that time was determined. The results are shown in Table 3.

Table 3

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a spliced yarn for explaining the blending coefficient, FIG. 2 is a schematic diagram of an apparatus for carrying out the second invention of the present application, and FIG. FIG. 3 is an enlarged perspective view of a take-off roller (stretching roller) section. 7 is a heating plate, 9 is a take-up roller (stretching roller), 1
1 is a doubling guide. stomach 2 diagram

Claims (1)

[Claims] 1. A plurality of synthetic fiber yarn bundles having different heat shrinkage rates are not aligned, and the blending coefficient of the plurality of synthetic fiber yarn bundles having different heat shrinkage rates is less than 50%. Yes, and 2-2077m
A composite yarn characterized by having a twist of. 2. Heat treatment is applied to a part of the plurality of synthetic fiber yarn bundles, and the remaining yarn bundles are not heat-treated to have different heat shrinkage rates, and then each yarn bundle is separated and passed to a take-up roller. 1. A method for producing a composite yarn, which comprises taking the composite yarn with a roller, doubling the yarn with a doubling guide after exiting the take-up roller, giving a twist of 2 to 2077 m, and winding the yarn. 3. The method for producing a composite yarn according to claim 2, wherein the synthetic fiber yarn bundle is combined using a V-shaped grooved guide. 4. The method for manufacturing a composite yarn according to claim 3, wherein the groove portion of the 47-shaped grooved guide has a surface roughness of 1.5S or more.