JPS59130309A - Production of yarn mix of different shrinkage - Google Patents

Abstract

PURPOSE:One group of the yarns made by melt-extruding a thermoplastic polymer is drawn and heat-set and the other group without heat treatment are combined and wound up at a high speed to produce the titled yarn mix with good touch at low costs. CONSTITUTION:A thermoplastic resin is melt-extruded through groups of nozzles to form yarn groups Y and Y' and they are cooled. The yarn Y runs around the taking-up roller 4 and goes to the yarn-combining guide roller 6. In the meantime, the other yarn group Y' is preheated up to 75-105 deg.C by means of the taking-up roller 4' and drawn at a ratio of less than 4 between the taking- up roller 4' and the heat-set roller 5, then heat-set at a temperature higher than the secondary transition point. Thus, the resultant high boiling water shrinkage yarn Y and the heat-set yarn Y' are combined at the guide 6 and the combined yarn is wound up around bobbin 9 at a speed of 3,600-4,800m/min to produce the bojective yarn mix with more than 4% difference in boiling water shrinkage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a differential shrinkage mixed fiber yarn with good texture at a low cost.

Conventionally, as a method for manufacturing differentially shrinkable mixed fiber yarn, there is a method in which each group of polyester yarns melted and discharged from two or more groups of spinning holes with different diameters is combined and wound (Japanese Patent Laid-Open No. 50-24
No. 529) has been proposed. According to this method, it is possible to produce a blended yarn in which two or more types of undrawn yarns with different single filament deniers and degrees of arrangement are sufficiently mixed only in the spinning process, which increases productivity and reduces costs. However, when this mixed fiber yarn is made into a woven or knitted fabric, the surface touch is poor and the texture is dull.

On the other hand, polyester is melt-spun from two or more spinning hole groups, at least one of the two or more yarn groups spun from each spinning hole group is subjected to a drawing process, and the remaining yarn For the group, the two yarns were combined without being subjected to stretching treatment, and 3,500
Method for manufacturing mixed fiber yarn that is wound at a speed of less than m/-
4-147216) is also known. The mixed fiber yarn obtained by this method has a flood shrinkage rate difference of less than 4% between the different shrinkage yarns constituting the mixed fiber yarn, and the electric properties of the mixed fiber yarn are insufficient and the texture is hard. (There is a 5th order point.

As a result of repeated research in order to eliminate the drawbacks of such conventional methods, the present inventors have found that even when simultaneous spinning is adopted, a portion of the yarn group spun from each spinning hole group is The remaining yarn group was not subjected to drawing heat setting and was made into a high boiling water shrink yarn of 3,600 to 4,8
00? The present invention was achieved by discovering that it is sufficient to wind the film at a speed of Fl/-.

That is, the present invention melt-spun a thermoplastic polymer through two or more groups of spinning holes, and applied drawing heat setting to at least one yarn group among the two or more yarn groups spun from each spinning hole group. treatment, and the remaining yarn group was doubled together without being subjected to drawing heat setting treatment to give a yarn density of 3,600 to 4,800.
This is a method for producing a differentially shrinkable mixed fiber yarn, which is characterized by obtaining a mixed fiber yarn consisting of a differentially shrinkable yarn having a difference in flood shrinkage rate of 4 or more when wound at a speed of ml m.

The thermal IJT plastic polymer to which the present invention is applied may be any polymer as long as it can be melt-spun, but polyester, nylon, etc. are particularly suitable.

According to the present invention, such a melt-spuntable thermoplastic polymer is melt-discharged from a plurality of spinning hole groups. The plurality of spinning hole groups referred to here may be provided in separate spinnerets, but in the case of industrial implementation, it is particularly preferable to use a plurality of spinnerets with the same spinning hole diameter but different numbers of spinning holes. suitable. Further, whether the discharge IT and the number of spinnerets of each spinning hole are the same or different for each spinning hole group can be freely selected depending on the surface touch of the intended woven or knitted material, stiffness, etc.

In the present invention, as described above, a plurality of yarn groups are melted and discharged from a plurality of spinning hole groups, and at least one yarn group is continuously subjected to drawing heat setting. (The heat setting temperature can be set to a temperature above the second-order transition point μ that allows heat setting, but it is preferably 110°C or higher.) On the other hand, after melt spinning, the remaining yarn group is combined with the yarn group that has been subjected to the above-mentioned drawing heat setting without being subjected to drawing heat setting, to obtain a yarn of a, 5oon/- or more, 4,
Wind up at 4 throat speed of 800 m/si+ or less. The difference in boiling water shrinkage rate between the yarn that has been drawn and heat set and the yarn that has not been heat set is 4.
% or more, and if this difference is less than 4 inches, it will not be possible to obtain sufficient fullness and the texture will be hard, making it unsatisfactory as a woven fabric.

In addition, if the winding chamber is less than 3,600 ml m, not only will productivity decrease, but the degree of orientation of yarn that is only melt-spun and not subjected to drawing heat setting will be low, making it difficult to increase the width during width adjustment and dyeing in later processes. This heat treatment is unsuitable because the texture of the woven or knitted fabric becomes hard. On the other hand, when the winding speed exceeds 4,800 m/-, the flood shrinkage rate of the yarn that is only melt-spun and not subjected to draw heat setting becomes low (the difference in flood shrinkage rate with the yarn that has been subjected to draw heat setting). is less than 4, which is the desired electrical property.

It is better to use an interlacing nozzle to mix and entangle yarns that have not been subjected to drawing heat setting, or which cannot obtain a good texture, and the yarns that have been drawn and heat set are mixed more uniformly and the yarns that have not been subjected to drawing heat setting are mixed more uniformly. This is more preferable because it prevents loops and threads from breaking during the process.

Next, the present invention will be explained using the drawings. The figure is a schematic side view of a spinning device showing a preferred embodiment of the present invention, in which 1 and 1' are spinnerets, 2 is a cooling air blowing part, 3 and 3' are oiling rollers, and 4 and 4' are take-up rollers. 5 is a drawing heat send roller, 6 is a doubling guide, and 7 is an interlace nozzle.

8 is a winder, 9 is a bobbin, Y is a group of high boiling water shrinkage yarns that are only melt-spun and have not been subjected to drawing heat setting, Y'
indicates a group of low-boiling water shrinkage yarns that have been subjected to stretching heat setting after melt spinning. In the figure, yarn groups Y and Yt are spinneret 1, respectively.
and 1', the yarn group Y is discharged from the cooling air blowing sections 2 and 2'.

It is cooled by cooling air blown in a direction perpendicular to Y-. The cooled yarn group Y passes through a take-up roller 4 and is guided to a gold thread guide 6. On the other hand, the cooled yarn group Y' is preheated to an appropriate temperature of 75 to 105°C by a take-up roller 4', and then subjected to drawing heat with a take-up roller 4' at a magnification of 4.0 times or less. It is stretched between set rollers 5, and then stretched with a stretching heat = 6 = cera) at a secondary transition point or higher, preferably 110
After being heat-set at a temperature of .degree. C. or higher, the fibers are combined with the high-boiling water shrinkage yarn group Y in a yarn-pairing guide 6 and subjected to a fiber-mixing and interlacing treatment in an interlace nozzle 7. The interlace nozzle 7 is a known nozzle described in Japanese Patent Publication No. 36-12230, and the interlace variation is normally adjusted to a range of 10 to 45 particles/m. Interlaced mixed fiber yarn is used in a winder.
8 is rolled up to the pobin 9.

The mixed fiber yarn obtained by the above method is extremely economical because it can be produced in one spinning step, and it is also a mixed fiber yarn of low-boiling water shrink yarn and high-boiling water shrink yarn. When made into a woven or knitted fabric, it has the advantage of providing a voluminous and excellent texture.

Example 3 Dry chips of polyethylene terephthalate (containing titanium oxide 0.3 times denser) having a limiting viscosity [l] of 0.64 as measured in a 5°C Ortsk polyphenol solution were prepared using the spinning bag +- shown in the figure. , the hole diameter is 0.27. The number of holes was changed as shown in the table below, and the melting temperature was 285.
The sample was melted and discharged at ℃ under the conditions shown in the table below. The two groups of yarns discharged were cooled in the usual way with cooling air at 25°C, then oiled in the usual way, taken up under the drawing heat setting conditions and spinning take-off speed shown in the table below, and wound up in a winder.

At this time, after the two groups of yarns are combined, the yarn guide hole diameter is 2. Using an interlace nozzle with a pressure hole diameter of 0.8 u,
Fiber mixing treatment was performed at a compressed air pressure of 4.519/iG. next,
The obtained mixed fiber yarn was used for the warp and weft, and the warp density was 46 yarns/
After weaving at a weft density of 26 threads/crn, shrinkage treatment was performed in hot water at 97° C. for 12 minutes using a p-Tariwasher.

Next, the woven fabric after the shrinkage treatment is fed 3 thiobars in the warp direction and subjected to a preset alkali weight loss treatment (processed at 98° C. with an alkali concentration of 18 f/l for 25 minutes) to reduce polyurethane and softness. The texture was evaluated.

The results are shown in the table below.

9- -10-

[Brief explanation of the drawing]

The figure shows an example of a spinning device for carrying out the present invention [I
@Front view. 1 and 1' are spinnerets, 2 and 2' are cooling air blowing parts. 3 and 3' are oiling rollers, 4 and 4' are take-up rollers, 5 is a drawing heat section roller, 6 is a doubling guide, and 7
is the interns nozzle, 8 is the winder, 9 is the bobbin,
Y indicates a yarn group that has not been melt-spun and has not been subjected to drawing heat setting.YL indicates a yarn group that has been subjected to drawing heat setting after melt spinning. Patent applicant Teijin Ltd. 11-

Claims (1)

[Scope of Claims] 1 A thermoplastic polymer is applied to a few of two or more yarn groups spun from two or more spinning hole groups (both one yarn group is subjected to a drawing heat setting treatment, and the remaining The yarn group was not subjected to drawing heat setting treatment, but the yarns were combined to give a yarn density of 3,600 to 4,000 yen.
A method for producing a differentially shrinkable mixed fiber yarn, which comprises winding at a speed of 800 m/- to obtain a mixed fiber yarn consisting of differentially shrinkable yarns having a flood shrinkage rate difference of 4% or more. 2. A method for producing a differentially shrinkable mixed fiber yarn according to claim 1, which performs interlacing treatment after doubling and before winding.