JPS6331567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, bulky parts and focusing parts alternately exist,
The bulky portion relates to a method for producing a special bulky yarn having loops and slacks made of crimped filaments with latent crimp being made apparent.

Conventionally, many methods have been proposed for producing bulky yarn using filaments with latent crimp.
In any of these methods, latent crimp is not brought to light sufficiently, and the desired bulky yarn cannot be obtained. There are two reasons for this; one is that it is not possible to manufacture a filament with enough crimp-inducing force to overcome the tension acting on the filament when latent crimp becomes apparent; One reason is that sufficient thread structure is not obtained to make crimp obvious. For these reasons, it is not possible to produce knitted fabrics with excellent bulking effects using multifilament yarns having latent crimp. That is, when a multifilament yarn having latent crimp is used and subjected to a relaxation heat treatment after knitting or weaving, the knitted fabric becomes extremely hard and bulkiness cannot be expected. In addition, even when knitting is performed after a multifilament yarn with latent crimp is subjected to relaxation heat treatment to make the crimp obvious, the crimp may become loose during the weaving process, resulting in a knit that does not have the desired bulkiness. It is impossible to obtain textiles.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a method for producing a special bulky yarn that is highly bulky and has a spun-touch and dry-touch feel. To this end, the present invention has the following configuration.
That is, the present invention provides a multifilament yarn with the lowest boiling water shrinkage rate (%) when interlacing two or more multifilament yarns including at least one thermoplastic multifilament yarn with latent crimp. ``A'') is a multifilament yarn with latent crimp, and a multifilament yarn (hereinafter referred to as ``B'') with an equivalent or next lowest boiling water shrinkage rate (%) is a multifilament yarn with latent crimp. A filament with latent crimp that is applied with or without the following different tension, then subjected to an interlacing treatment to generate loops and slack, and then subjected to a relaxing heat treatment to form the bulky portion. This is a method for producing a special bulky yarn characterized by making the crimp of the yarn apparent and increasing the bulk. Tension condition is 1.0g/d≧To−Tn≧0.1
g/d, where Tn is the tension of A (g/d),
To is the tension of B (g/d).

Next, the present invention will be explained using illustrated examples.
FIG. 1 is an external view of the special bulky yarn before the relaxing heat treatment, and FIG. 2 is an external view of the special bulky yarn according to the present invention after the relaxing heat treatment. In Figure 1, 1 is a thermoplastic filament with the lowest boiling water shrinkage rate (%) of latent crimp, and 2 is a thermoplastic filament with the same or the next lowest boiling water shrinkage rate (%) as filament 1. Yes, with or without latent crimp. In FIG. 2, X indicates a bulky portion and Y indicates a focusing portion. The bulky portions X and the convergent portions Y are present alternately, and 3 indicates a loop consisting of a crimped filament with latent crimping. In addition, the boiling water shrinkage rate of the multifilament yarn in the present invention was based on method A of JIS-L-1090. In FIG. 4, undrawn yarns Y ₁ and Y ₂ with latent crimp are unwound from package P ₁ and P ₂ respectively, and guides 4 and 5 are undrawn.
It is then fed to the feed roller 6. One of the undrawn yarns Y ₁ passes through the feed roller 6 and is wound around the hot roller 7 six times, then comes into contact with the heater 8 to reduce the boiling water shrinkage rate and is supplied as the multifilament yarn A to the first delivery roller 10 . The other undrawn yarn Y ₂ passes through a feed roller 6, is wound around a hot roller 7 six times, passes through a guide 9, and is supplied to a first delivery roller 10 as a multifilament yarn B having a high shrinkage rate in boiling water. Here, the boiling water shrinkage rate of multifilament yarn A is the lowest, and that of multifilament yarn B is equivalent to that of multifilament yarn A, or that of multifilament yarn A.
It is the second lowest after that. For example, if there are three types of multifilament yarns with different boiling water shrinkage rates, the boiling water shrinkage rate of multifilament yarn B will show an intermediate value. The reason why the relationship between boiling water shrinkage rate is as described above is to obtain a bulking effect. An example of a multifilament yarn having latent crimp is one in which the cross section of the fiber is asymmetrically cooled by cooling air before the fiber is discharged from a spinneret and solidified. The standard for the potential crimp of multifilament yarn is 1/ρ (where ρ is the helical diameter (mm) of the crimp that occurs when the filament in a non-tensioned state is treated for 15 seconds at the shrinkage treatment temperature) is 3 to 10. The range is appropriate. This standard, ie, latent crimpability 1/ρ, is adjusted by the fiber cross-sectional shape, spinning conditions, drawing conditions, and the like. Note that the multifilament yarn B does not need to have latent crimp. In addition, multifilament yarn A is
In order to make the next entangling process effective, it is preferable to use filaments with irregular cross-sections as shown in Figure 3, which are easy to open, and it is even more effective for both multifilament yarns A and B to have irregular cross-sections. be.

Here, between the feed roller 6 and the first delivery roller 10, the multifilament yarn A and the multifilament yarn B are 1.0g/d≧To−Tn≧
A different tension of 0.1 g/d is applied. Here, Tn is the tension (g/d) of the multifilament yarn A, and To is the tension (g/d) of the multifilament yarn B. In addition, in the case of the figure, the tension given to multifilament yarn A and multifilament yarn B corresponds to drawing tension. In order not to reduce the crimp manifestation ability of the thermoplastic multifilament yarn having latent crimp, it is preferable that the heating body such as a hot roller or heater be set at a low temperature and under low tension as much as possible. Even when using drawn yarns as multifilament yarns A and B, 1.0g/d≧To-
A different tension of Tn≧0.1g/d is given.

When To−Tn＞1.0, the resulting yarn loop,
If the slack becomes too large, post-processing properties such as knitting properties and weaving properties will deteriorate. To
- When Tn<0.1g/d, the formation of loops, slack, etc. is insufficient, so the curling crimp does not become apparent, and the desired bulkiness is not obtained. . First delivery roller 1
The multifilament yarn A having the lowest latent crimp with the lowest boiling water shrinkage rate and the multifilament yarn B with the next lowest boiling water shrinkage rate are sent to the interlacing device 11, where they are entangled. A pair of second delivery rollers 1 are provided with loops and slack.
2 and formed into a package 13 by a winding drum 14. Next, a relaxing heat treatment is performed to make the crimp of the filament having latent crimp forming the loop portion apparent, and the resulting yarn is made bulky. Note that the relaxation heat treatment may be continuously performed on the multifilament yarn leaving the second delivery roller 12.

As described above, according to the present invention, it has high bulkiness,
A special bulky yarn with a dry-touch feel can be stably produced by spun-touching, and a knitted fabric with an excellent bulking effect can be obtained.

Example Using the apparatus shown in Fig. 4, a polyester multifilament yarn (173d/48f) with the irregular cross section shown in Fig. 3 was used as the undrawn yarn _Y1 , and was wound at 2000 m/min as the undrawn yarn _Y2 . The present invention was carried out using polyester multifilament yarn (round cross section 158d/24f). In addition, when the polyester multifilament yarn with an irregular cross section was wound at a winding speed of 1300 m/min, asymmetric cooling was performed to enhance the cooling effect immediately after spinning, and latent crimp was imparted. The stretching ratio is
2.46, temperature of hot roller 7 is 80℃, heater 8
The temperature was 140℃. The undrawn yarn Y ₁ passes through the feed roller 6 and the hot roller 7 and then comes into contact with the heater 8 and is supplied to the first delivery roller 10, while the undrawn yarn Y ₂ passes through the feed roller and the hot roller 7.
After passing through the paper, the paper was passed through a guide 9 and then supplied to a first delivery roller 10 . Multifilament yarn A corresponding to undrawn yarn Y ₁ (1/ρ of irregular cross section is 5.0
It was hot. ) has a boiling water shrinkage rate of 7.0%, and the boiling water shrinkage rate of multifilament yarn B, which corresponds to undrawn yarn Y ₂ , is 15.4%. The filament yarn B was applied with a drawing tension of 0.89 g/d and fed to the interlacing device 11 (air pressure 1.5 Kg/cm ² G) to give loops and slack, and then continuously heat-treated at a temperature of 180 at an overfeed rate of 7.0%. A special bulky yarn was produced by supplying the filament to a relaxation heat treatment zone at 0.degree. C. to make the latent crimp manifest. Double knit using this bulky yarn (double-sided knitting machine, 18 gauge)
When knitted, a very bulky, dry-touch, span-tight knitted fabric was obtained.

[Brief explanation of the drawing]

The figures relate to the present invention; FIG. 1 is an external view of the special bulky yarn before relaxation heat treatment, FIG. 2 is an external view of the special bulky yarn according to the present invention, and FIG. 3 is an external view of the special bulky yarn before relaxation heat treatment. FIG. 4 is a front view of an apparatus for carrying out the present invention. Y ₁ ... Undrawn yarn, Y ₂ ... Undrawn yarn, 6 ... Feed roller, 7 ... Hot roller, 8 ... Heater, 9 ... Guide, 10 ... First delivery roller, 11 ... Entanglement device, 12 ...Second delivery roller.

Claims (1)

[Claims] 1. When two or more multifilament yarns containing at least one thermoplastic multifilament yarn with latent crimp are intertwined, a multifilament yarn with the lowest boiling water shrinkage rate (%) (hereinafter referred to as "A") is used. ) as a multifilament yarn with latent crimp, and a multifilament yarn with an equivalent or next lowest boiling water shrinkage rate (hereinafter referred to as "B") as a multifilament yarn with or without latent crimp. , give the following different tension,
The filament is then subjected to an interlacing treatment to generate loops and slack, and then subjected to a relaxing heat treatment to make the crimp of the filament having latent crimp forming the bulky part manifest and increase the bulk. A method for manufacturing special bulky yarn. 1.0g/d≧To−Tn≧
0.1g/d, however, Tn is the tension of A (g/d), To
is the tension of B (g/d).