JPS6223090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polypropylene filament mixed color yarn using a plurality of different colored and/or different dyed polypropylene composite filament yarns.

Conventionally, filament yarns that have been used as carpet yarns for color matching effects have been typically yarns obtained by ordinary twisting, space-dyed yarns, and the like. However, the color change due to the twisted yarn is too monotonous, and not only is the color effect insufficient, but also vertical streaks, moire, etc. are likely to occur on the carpet surface, which may significantly reduce product performance. Furthermore, although space-dyed yarn is superior in terms of diversity in the number of hues, it has problems in terms of color fastness and production cost. Therefore, filament mixed color yarn is being developed as a yarn that is superior in terms of color effect and productivity compared to twisted yarn, space dye, etc. The aim is to create a hue change effect by mixing threads. However, with conventional filament mixed color yarns, (1) the filaments are excessively mixed together, so although the color mix effect can be achieved, the unique color tone of the filament yarn used is destroyed and the various hues used are This results in an intermediate color, which is the same as simply using a single filament yarn with an intermediate color, and the meaning of using multiple filament yarns with different hues is lost. Even if the mixed portion between the filaments could be extracted, the appearance of the carpet was significantly impaired due to the occurrence of "constrictions" in the mixed portion. As described above, the conventional filament mixed color yarns actually have the above-mentioned problems.

The present invention improves the above-mentioned conventional drawbacks,
The gist of this method is to use multiple polypropylene composite filament yarns with a total denier of 600 deniers or more and an apparent crimp rate of 2.5 to 6.5%, and to first separate the individual filaments. Actual drawing is performed by applying tension to the filament yarn to remove entanglements and to cause crimping during overfeeding, and then the actual drawing is performed by introducing the filament yarn into an overfeeding region of 10 to 45%. The filaments are crimped to a crimp rate that is 1.2 to 1.7 times the actual crimp rate of the previous filament yarn, causing mutual entanglement between the filaments, and then a fluid jet is jetted onto the filament yarns to randomly entangle the filament yarns. The present invention provides a method for producing polypropylene filament mixed color yarn.

That is, the present invention specifically has an actual crimp rate of 2.5 to 2.5.
A plurality of different colored and/or different colored polypropylene composite filament yarns (hereinafter sometimes simply referred to as composite filament yarns or filament yarns) which have been crimped in the range of 6.5% in advance are used, and are first crimped in the actual drawing area. The filament yarn is supplied, and a tension between the first yield point and the second yield point is applied to perform actual drawing. The purpose of this actual drawing is to substantially remove any entanglement that may have been applied to the individual fed filament yarns and, if overfeeded, to cause crimp development. After the filament yarns have been actually drawn in this way, they are introduced into the excess supply area, and entanglement is generated between the filament yarns due to crimping, and at the same time, the filament yarns are randomly entangled with each other by a fluid jet. This makes it possible to obtain the desired filament mixed color yarn.

Next, the present invention will be specifically explained using illustrated examples.

FIG. 1 shows a schematic diagram of an example embodying the method of the present invention. Of course, it goes without saying that various configurations other than those shown in FIG. 1 can be considered. In the figure, different color and/or different color composite filament yarns, that is, supply yarns A, B, and C, which have been crimped with an actual crimp rate in the range of 2.5 to 6.5%, are running tension adjustment guides 1, 1', and 1. '', the filaments present in each of the supplied yarns A, B, and C are sent to the actual drawing area, which is made up of feed rollers 2, 2' and draw rollers 3, 3'. At the same time as the entanglements are removed, actual stretching is carried out so that crimp occurs in the excess supply area consisting of the draw rollers 3, 3' and the delivery rollers 4, 4'. This is to remove the entanglement of the filament and to cause the crimp to develop within the excessive supply region to a range where the actual crimp rate is 1.2 to 1.7 times that of the supplied yarn, and between the first yield point and the second yield point. Stretching is performed by tension.
A major feature of the present invention lies in the fact that actual stretching is performed in this way.If the purpose is simply to remove the entanglement of the individual filaments supplied, actual stretching is not necessary, but if actual stretching is not performed, There is no crimp, and therefore, when trying to obtain a filament mixed color yarn, the ejection pressure and flow rate of the fluid jet from the nozzle 6 must be extremely increased, which poses a problem in processing cost. That is, crimp development in the oversupply region becomes possible only by actual stretching. Also, to explain the point where actual stretching is applied by tension between the first yield point and the second yield point,
If actual drawing is performed with a tension higher than the second yield point, crimping will occur significantly, and although it is possible to produce mixed color yarn even if the fluid jet pressure is extremely low, carpet performance may deteriorate due to a decrease in denier. . On the other hand, if the tension is lower than the first yield point, the occurrence of crimp in the oversupply region will be reduced, so the ejection pressure of the fluid jet must be increased. Therefore, the actual stretching must be carried out to an extent that does not impair the carpet performance due to a decrease in denier, and in a range that allows sufficient crimp development within the oversupply region. The tension between Note that this can be achieved by appropriately setting the surface speed ratio of the feed rollers 2, 2' and the draw rollers 3, 3'.

Since the composite filament yarn used in the present invention is not a yarn crimped by mechanical crimping such as gear crimping or stuffing box crimping, the crimping of the supplied yarn will not be reduced or eliminated by drawing. This method takes advantage of the fact that crimp occurs in the oversupply area, and the oversupply area is caused by the draw roller 3,
3' and delivery rollers 4, 4',
By having the delivery roller have a lower surface speed than the draw roller, the filament is over-fed. In the oversupply region, the actually drawn supplied yarn develops crimp, and entanglement (self-entanglement) between different colored and/or heterochromatic composite filament yarns occurs only due to the occurrence of crimp. Due to this self-entanglement, the consumption amount of fluid jet to the filament can be greatly reduced. Note that in order for self-entanglement to occur, the actual crimp rate within the oversupply region must be 1.2 times or more that of the supplied yarn. Of course, if it is 1.2 times or more, self-entanglement will be further promoted, but in order to generate crimp that exceeds 1.8 times the supplied yarn, the stretching ratio in the actual stretching area must be set to a tension higher than the second yield point. Otherwise, there is a risk that the carpet performance will be affected. Therefore, it is preferable that the actual crimp ratio in the oversupply region is 1.2 to 1.7 times that of the supplied yarn. Moreover, in order to develop crimp of 1.2 to 1.7 times, tension in the yarn length direction must not be applied to the yarn within the oversupply region.

A fluid jet is injected onto the filament in order to further promote the entanglement (self-entanglement) between the filament yarns only due to the development of crimp in the excess supply area and improve the stability of post-processes such as tufting leading to carpeting. Injecting the fluid jet onto the filament in this way not only increases the stability of the post-process, but also randomizes the entanglement between the filaments, eliminating the occurrence of streaks and moiré on the carpet, and improving product performance. It becomes extremely good. It should be noted that the fluid jet nozzle is placed in an overfeed zone consisting of draw rollers 3, 3' and delivery rollers 4, 4'. The fluid used may be air, a mixture of air and water, heated steam, or the like, but air or a mixture of air and water is preferable from the viewpoint of availability and processing cost. Further, the fluid jet nozzle 6 may have a shape substantially similar to a commonly used interlaced nozzle.

Self-entanglements and random entanglements due to fluid jets are formed in the overfeed region, but at this time no tension should be applied in the yarn length direction. Self-entanglement is achieved by developing crimp with an actual crimp rate of 1.2 to 1.7 times that of the supplied yarn, and in order to achieve sufficient inter-filament entanglement with the fluid jet, an excess supply of 10 to 45% is required. There is.

The winder 5 maintains the random entanglement between the filaments formed in the excess supply area.
The filament is wound into a filament mixed color yarn.
The obtained filament mixed color yarn has substantially no twist. Although no twist is preferred, slight twist may occur during filament mixed yarn production. However, the mixed color yarn obtained by the present invention has a random twist of 0 to 5 T/M, has no substantial twist, and has sufficient effects of a filament mixed color yarn.

An example of the mixed color yarn obtained by the present invention is shown in FIG. The figure shows a case where different colored filament yarns A and B are used. Part X where the hues are completely mixed
and portions Y and Z indicating the hue specific to the filament used. The hue effect unique to the filament used does not disappear due to excessive mixing (in the figure, the mixed color yarn consists of only the X part), which was a drawback of conventional filament mixed color yarns. ``In other words, the mixed part is not extremely thin compared to other parts, and the color effect and product quality of the carpet are also very good. Moreover, since it is a filament mixed color yarn that is virtually untwisted, the carpet pattern exhibits a flowing hue, which is essentially different from conventional heathered pattern carpets and space dye carpets. Furthermore, by combining filament yarns with different degrees of crimp in the oversupply region, the filament with less crimp becomes entangled so as to cover the filament with greater crimp. By utilizing this phenomenon, a filament mixed color yarn that emphasizes any color can be obtained, and the filament mixed color yarn obtained by the present invention can be applied to an extremely wide range of fields of use.

In order to know the degree of mixing of the filament mixed color yarn obtained by the present invention, the degree of entanglement between single fibers is measured. Insert the mixed color thread almost in the center and hang it, and express the distance (cm) that the hook naturally falls.

EXAMPLES Next, the present invention will be specifically explained using Examples, but the present invention is not limited by these Examples.

Example 1 Polypropylene melted at 300°C and 230°C and having a melt flow rate (MFR) of 5 was joined side-by-side and composite spun at a spinning speed of 1000 m/min. Undrawn yarn was stretched 2.0 times at room temperature. 45
% overfeed, crimping occurs, and then
Three spun-dyed polypropylene composite filament yarns of different hues obtained by heat treatment at 90°C (moist heat) were used. The first thread is 1305d/60f with an apparent crimp rate of 5.4%, and the second thread is 1324d/60f with an apparent crimp rate of 5.6.
%, and the third yarn was 1285d/60f with an apparent crimp rate of 5.4%. The apparatus for obtaining the mixed color yarn is the one shown in Fig. 1, and the tension (0.75 g/d) between the first yield point and the second yield point is applied in the actual stretching area, and the actual stretching is carried out at 32%. There was an oversupply of

The actual crimp rate of crimp that occurred within the oversupply area was 7.0% for the first yarn, 6.7% for the second yarn, and 6.9 for the third yarn.
It was %. The degree of self-entanglement by the first, second, and third threads was 18.2 when measured by the method described in the text. The entanglement degree of the mixed color yarn obtained by ejecting the fluid jet from the nozzle in the excess supply area was 4.3. The fluid jet uses air, the air pressure is 4.0Kg/ ^cm2 , and the processing speed is
The speed was 200m/min. In the obtained mixed color yarn, the filaments were randomly intertwined, and the hue portions unique to the first, second, and third yarns as well as the mixed portions of each yarn appeared in the same proportion as a whole. Incidentally, when the above-mentioned supplied yarn was used under conditions where self-entanglement did not occur, that is, without actual stretching, and the speed of the feed roller and draw roller were almost the same, the air pressure was 6.0 Kg/cm ² and the processing speed was 50 m. /
The entanglement between the filaments was 42.8, which not only resulted in poor productivity, but also made tufting impossible.

Example 2 Three spun-dyed polypropylene filament yarns of different hues were obtained under the same conditions as Example 1 except that the single yarn denier was reduced by changing the amount of polymer discharged from the discharge hole of the composite spinneret. used. The first yarn is 908d/60f with an apparent crimp rate of 2.7
%, the second yarn was 925d/60f and had an apparent crimp rate of 5.6%, and the third yarn was 913d/60f and had an actual crimp rate of 5.3%.
Stretching is performed using the tension between the first yield point and the second yield point (0.64
g/d) to give a 23% overfeed. The actual crimp rate of crimp that occurs within the oversupply area is the first
The second thread is 3.4%, the second thread is 6.8%, and the third thread is 6.4%.
It was hot. The degree of self-entanglement between the first, second, and third threads was 17.8. The degree of entanglement of the mixed color thread after ejecting the fluid jet is 3.8
It was hot. Note that the air pressure was 4.0 Kg/cm ² and the processing speed was 200 m/min. The resulting yarn was randomly intertwined with the first yarn surrounding the second and third yarns.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a state in which a filament mixed color yarn is manufactured by implementing the present invention, and FIG. 2 is a side view showing an example of a filament mixed color yarn obtained by the present invention. . In the figure, A, B, C are supply yarns, 1, 1',
1'' is the tension adjustment guide, 2, 2' is the feed roller, 3, 3' is the draw roller, 4, 4' is the delivery roller, 5 is the winder, 6 is the fluid jet nozzle, and X is the filament color mixing section. , Y, and Z indicate portions having hues specific to the filament used.

Claims (1)

[Claims] 1 A plurality of different colored and/or different colored polypropylene composite filament yarns with a total denier of 600 deniers or more and an apparent crimp rate of 2.5 to 6.5% are used, and the entanglement of individual filaments is first removed, and excess During feeding, tension is applied to the filament yarn to cause crimp development, and actual drawing is performed.
After that, it is introduced into an oversupply region of 10 to 45%, and the actually drawn filament yarn is caused to develop crimps at a crimp rate that is 1.2 to 1.7 times the actual crimp rate of the filament yarn before actual drawing, thereby causing mutual entanglement between the filaments. 1. A method for producing a polypropylene filament mixed color yarn, which comprises the steps of: producing a mixed color polypropylene filament yarn; and further jetting a fluid jet onto the filament yarn to randomly entangle the filament yarns with each other.