JPH02182910A - Latent bulky multifilament yarn - Google Patents

Abstract

PURPOSE:To obtain latent bulky multifilament having liveliness and a little reduction in bulkiness, comprising filament having sectional shape wherein three flat units of specific shape are radiately bonded at one point. CONSTITUTION:A nozzle of spinneret for forming this filament has a shape wherein slits 2 extending three directions from a central hole 1 are connected to flat units. Each flat unit has a shape wherein a pair of slit-shaped extrusion holes 3 and 4 are bonded at a connecting part 5 and an extrusion hole 6 of connecting part is set at approximately the center of the connecting part 5. In the shape, diameter of lB of an inscribed circle of the extrusion hole 6 of the connecting part is larger than maximum width lC of slit-shaped extrusion holes 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a multifilament yarn made of a thermoplastic synthetic polymer and having a special cross section and latent crimp, and a carpet using the same.

<Prior art> Conventionally, a method of obtaining a crimped yarn by combining two polymer streams melted and discharged through a nozzle directly under the nozzle while colliding and pulsating is known as so-called pulsing yarn (for example, special Publication No. 54-4241J%, No. 55-518
Publication No. 09, Publication No. 60-131510, Publication No. 60-1
85809, etc.).

Furthermore, the patent application No. 61-280807 filed by the present applicant
In the specification of No. 62-297774,
Discharging the polymer from a connected discharge hole in which a pair of slit-shaped discharge holes and a single discharge hole are connected via a slit,
At this time, by making the polymer flow discharged from a pair of discharge holes slower than the polymer flow discharged from a single discharge hole, the high-speed polymer flow can be pulsated without colliding with the low-speed polymer flow. It has been proposed to impart sufficient bulk and level dyeing properties to a woven or knitted fabric made of the obtained multifilament.

However, it has been found that when these bulky multifilament yarns are used for applications such as carpets that are stepped on by foot, the bulkiness of the product decreases as the number of steps is increased, and the product tends to become stiff. It has also been found that there are still problems such as the pile form formed in the carpet lacks tension (elasticity), has bulk but lacks elasticity, and has too soft texture.

<Object of the invention> The object of the present invention is to solve the problems of the above-mentioned prior art and the invention related to the earlier application, Japanese Patent Application No. 62-297774,
The purpose of the present invention is to provide a bulky yarn for carpets that has a waist and less flattening.

<Structure of the Invention> According to the present invention, there is provided a multifilament yarn composed of filaments made of a thermoplastic synthetic polymer and having a flat multilobal cross section, the constituent filaments having the following properties in the cross section and longitudinal direction. It has a flat unit that satisfies the conditions [A] and [B] at the same time, and the flat unit extends radially in at least three directions through one point, and at least one or more of the flat units extend radially in at least three directions through one point. A potentially bulky multifilament yarn is provided which is characterized in that it is spliced.

[A] Cross section of flat unit [A]-1 shape (i) A connecting part that connects two pairs of flat parts arranged at intervals has both ends joined to the side surfaces in the long sleeve direction of each flat part. while forming a pair of recesses facing each other.

Qi) The inscribed circle diameter (ia) of the connecting portion is larger than the maximum inscribed circle diameter ic) (J2c') of each of the flat parts divided by a straight line on the shortest distance between a pair of recesses.

[A]-2 Shrinkage difference The degree of orientation of the connecting part is lower than that of the flat part.

[B] Longitudinal direction of filament The connecting part has a shrinkage difference due to uneven thickness.

Further describing the present invention, the present inventors have conducted various studies in order to impart improved level dyeing properties and fine and uniform crimp to pulsing yarn so that it can be used for carpets and other rugs. ,Before)! The cross-sectional shape is optimized to improve elasticity while effectively utilizing the basic unit consisting of the conditions of Δ and 8. In other words, if the flat unit is extended radially in at least three directions through one point or one hollow point, the cross section will be 2
The next moment ■ increases, and the bending hardness of the pile (E
They found that when the loop pile or cut pile is formed in carpets, etc., the material has a firm texture and can withstand sagging due to compression.

To further explain the present invention in detail with reference to the drawings, Fig. 1 shows a die for obtaining a deformed trilobal cross section in which flat units are combined in three directions, and Fig. 2 shows a yarn obtained thereby. A cross section is shown.

The flat unit has a slit 2゜2' through the center hole 1,
It extends radially in three directions from 2'' and is connected to a flat unit.The flat unit has a pair of slit-shaped discharge holes 3.
3', 3'' and 4.4'4'' are joined by connecting portions 5.5', 5''. Connection discharge holes 6, 6'6'' are provided in the connecting portions. Here, the inscribed circle diameter 8 of the connecting part discharge holes 6°6', 6'' is the maximum inscribed circle of the slit-shaped discharge holes (flat parts) 3.3', 3'' and 4.4'4''. , QC, , (c', Ha").

The cross section of the yarn obtained with this nozzle is as shown in Figure 2, with connecting parts 7.7'7 n, 7 with uneven thickness.
nt is flat part 8.8', 9.9', 10°10'
The degree of orientation is lower.

Due to the difference in the degree of orientation between the connecting part and the flat part, there is a shrinkage difference between the two, and since there is a shrinkage difference in the connecting part due to pulsing in the longitudinal direction of the yarn, distortion occurs in the cross-sectional direction and longitudinal direction. Complicated crimp occurs due to the difference. This complex crimp gives the carpet excellent bulkiness, and also has a cross-sectional effect that cannot be obtained with a simple flat unit.
A bending hardness of ~3 and elasticity of 2 is obtained, which results in less sagging due to compression of the carpet.

Figures 1 and 2 show an example of connecting flat units in a trilobal shape, but as shown in Figure 3, the number of flat units may be increased by two or three in the longitudinal direction. . Further, as shown in FIG. 4, the flat units may be connected in four directions (in a cross shape). However, the number of radially extending branches is preferably limited to 5 to 7 directions at most in order to avoid complicating the shape of the cap. Although FIG. 5 shows a case where the center is hollow, it is basically the same as the case where it is solid.

The thermoplastic synthetic polymer referred to in the present invention refers to nylon-6,
It refers to polyamide polymers such as nylon-66, polyester polymers such as polyethylene terephthalate, polybutylene terephthalate, polypropylene, and other thermoplastic synthetic polymers. It is preferable that the degree of polymerization of these polymers is as high as possible because orientation differences are likely to occur during spinning. For example, for nylon-6, [η] should be 1.3 or more, particularly 1.5 or more. is preferred.

In addition, a higher spinning speed is preferable in order to impart a difference in orientation during spinning, and in the case of nylon-6, 1000 Tr is preferable.
L/+ain or more, preferably 2000-2500T
rL/1n or more.

In particular, the lower the [η] of the polymer, the faster the spinning speed needs to be, and the lower the melting temperature of the polymer during spinning, the more desirable it is in terms of giving a difference in orientation. It has a similar effect.

The optimum polymer melting temperature for nylon-6 [η]-1,55 is around 270°C.

Further, it is preferable to rapidly cool the yarn discharged from the spinneret in order to create a difference in orientation, and it is better to rapidly cool the yarn by using a horizontal blowing cooling method rather than a vertical blowing cooling method.

After the yarn spun at high speed in this manner is applied with a finishing oil, in the case of nylon-6, it is stretched 1.2 to 2.0 times and wound up. This crimping of the yarn is achieved by heat-treating the yarn in the form of a carpet using steam or dry heat. In this case, heat during the dyeing process, packing process, etc. functions to develop crimp. However, in the case of spun-dyed yarn in which color pigments have been kneaded in advance at the polymer stage, a separate crimp development treatment is required.

The latent bulky multifilament according to the present invention is produced by high-speed spinning and has different degrees of orientation in the cross-sectional direction and the longitudinal direction of the yarn.
Uniformity of dyeing! 414 In terms of color fastness and weather (light) fastness, when a dyed yarn is combined with a dyed yarn in which pigments are mixed in advance at the polymer stage, the yarn has more perfect performance.

Effects and Effects> According to the present invention, a carpet that not only has excellent bulk but also has elasticity and a firm texture can be obtained. Carpets can be easily obtained.

<Example> Nylon-6 polymer ([η] = 1.55) was melt-spun using the spinneret shown in FIG. Polymer melting @
The temperature was 270℃, and cooling air (wind m
= 5.0 m3/min).

The discharge linear velocity of the yarn discharged from the nozzle is 3.5 m10
11n has a draft of approximately 714 times, 2500m
1.4 times, 3500 after being taken over at a speed of /sin
I stretched at m/1n! It was taken away.

The final denier of A7-n was 1300 denier and the number of filaments was 68.

After doubling two of these yarns and twisting them 60 times/m,
! A loop carpet was made using a 10-inch gauge tufting machine and continuously dyed. At that time, the latent crimp of the yarn was developed by the heat during dyeing.

For comparison, see Figure 8-(a) of Japanese Patent Application No. 61-280807.

The flat cross-section shown in FIG. 3-(a), the cross-sections shown in FIG. 8-(b) and FIG. 3-(0) were also evaluated at the same time.

In addition, in the above-mentioned examples according to the present invention, a spun-dyed yarn obtained by adding 1.0% of a colored pigment during the melting stage of the polymer was also evaluated. In this case crimp development was carried out by exposure to 100°C steam for 1 minute.

Furthermore, two of the above-mentioned example and comparative yarns were twisted together, twisted up and down 100 times, subjected to a moist heat setting at 125°C, and then used to run in a 1/10 gauge tufted carpet kettle. A cut pile carpet was made and its carpet performance was similarly evaluated.

The dimensions of the cap in Figure 1 are as follows.

Inscribed palindrome 8 = 0.27 φ Inscribed palindrome c = 0.10 φ Diameter of center hole 1 = 0.27 φ Width of slit 2 = 0.06 Length of 2 to ttun slit = 1.05m Width of flat slit 3 = 0.1#Im Length of flat slit 3 = 1.5111 Width of connecting part slit 5 = 0.06M Length of connecting part slit = 3.0M △, 1/10 gauge loop J-bet evaluation (pile height 5#llI! 6009/mth A/J) When made into a loop carpet, only Example 1.2 shown in the present invention shows excellent carpet elasticity (waist) and durability. . In addition, the dyeing fastness of the original yarn was extremely excellent.

B. Cut carpet (brush 1 standard) evaluation < 1/
10 gauge, pile height io, basis weight 1Kg/TIt)
In the case of cut carpets, as in the case of loop carpets, only Examples 1 and 2 according to the present invention showed good results. Here, the waist (elasticity) of the carpet increases,
The reason for improved durability is schematically shown in Figure 6 in Comparative Example-1 (
As shown in comparison with Figure a), in the case of the present invention (Figure b), the bending stiffness (EI) increases due to the cross-sectional effect, and the radially extending "fins" prevent the bile from falling due to the beam effect. Because it supports the carpet, it is thought that the effects are particularly additive in the case of carpet.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the cap used in the present invention, and FIG.
The figure is a cross-sectional view of the yarn spun by the above-mentioned spindle, Fig. 3 is a plan view showing an example of the case where the number of flat units of the above-mentioned spindle is increased, and Fig. 4 is a cross-sectional view of the case where the flat units are joined in a cross shape. FIG. 5 is a plan view showing an example, FIG. 5 is a plan view showing an example where the center is hollow, and FIG. 6 is a conceptual diagram schematically illustrating improvement in pile feel 1 elasticity. 1... Center hole 2.2', 2''... Slit 3.3', 3''... Slit-shaped discharge hole 4.4', 4
″... Same as above, QC, fic', ρC″... Slit-shaped discharge hole (3
...4...) Maximum inscribed circle 5.5', 5"...Connection portion 6.6', 6"...Connection discharge hole US...Connection discharge hole (6,6' , 6") inscribed circle diameter 7.7', 7"7"'... Connecting part with uneven thickness in filament 8.8', 9.9', IL 10'... Flat part Patent Applicant Teijin Co., Ltd. Representative Patent Attorney 1) Junsha / Hiroshi, Figure 4 Figure 3 Figure 9' Figure 2■ Figure (α) A = Circle 1 z and 2 lie

Claims (1)

[Scope of Claim] A multifilament yarn composed of filaments made of a thermoplastic synthetic polymer and having a flat multilobal cross section, the constituent filaments having the following [A] and [ It has a flat unit that satisfies the conditions of [B] at the same time, and the flat unit is connected radially in at least three directions through one point, and at least one or more of the flat units are connected in a row. Potentially bulky multifilament yarn. [A] Cross section of flat unit [A]-1 shape (i) A connecting part that connects two pairs of flat parts arranged at intervals has both ends attached to the sides in the longitudinal direction of each flat part. Forming a pair of recesses facing each other while being joined. (ii) The inscribed circle diameter (l_B) of the connecting part is larger than the maximum inscribed circle diameter (l_C) (l_C') of each flat part divided by a straight line on the shortest distance between a pair of recesses. . [A]-2 The degree of orientation of the differential shrinkage connection portion is lower than that of the flat portion. [B] The longitudinal connection portion of the filament has a shrinkage difference due to uneven thickness.