JPH05287632A - Hollow crimped yarn - Google Patents

Abstract

PURPOSE:To obtain hollow crimped yarn, suitable as cut pile carpets and rich in napping properties and durability. CONSTITUTION:The objective hollow crimped yarn is characterized by single filaments, having a cross-sectional shape formed of 3 ridge parts 1 protruding to the outside, 3 valley parts 2 and one hollow part 3 in which the shape of the ridge parts has -10 to +10 deg. crossing angle of the extension lines of the opposite side lines forming the ridge parts, 5-20mum thickness at a position corresponding to 1/2 of the height of the ridge parts, 5-20mum thickness of the thinnest part in the annular part formed by the valley parts and the hollow part and 5-25% extension rate of the crimps and accounting for at least 70% of the total number of single filaments.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow crimped yarn suitable for carpets, and more particularly to a hollow crimped yarn suitable for cut pile carpets.

[0002]

2. Description of the Related Art Conventionally, as to bulky synthetic fibers, crimped yarns, modified cross-sectioned yarns, hollow fibers and combinations thereof have been generally known and widely practiced.

The crimped yarn has been used practically for a long time, but when the crimp elongation ratio is increased to increase the bulkiness, especially in a cut pile carpet, the single yarn constituting the pile is bent and the felt is felt. There is a problem that it becomes like and it is not possible to achieve both bulkiness and napiness.

Regarding a crimped yarn for carpets, which has a non-circular cross-sectional shape of a single yarn, that is, a modified cross-section yarn, for example, the irregularity of the tri-lobal yarn is disclosed in Japanese Utility Model Publication No. 62-36869. It is described that the crimp ratio is limited to 3.7 or more and the crimp ratio is limited to 4 to 9.5.

However, the irregularity of the irregularly shaped cross-section yarn is set to 3.
When the number is 7 or more, not only the protrusion becomes thin and the wear resistance and light resistance are poor, but also the bending recovery property is extremely poor and crushing, that is, fatigue is likely to occur, and it is considered as a means for recovering this fatigue. A technique to increase the fineness of single yarn is used, but in this case the single yarn becomes coarse and rigid, and when used as a carpet, the aesthetic appearance and elastic feeling when traversing are inferior, and a high quality cut pile carpet cannot be obtained. Has the problem.

Hollow fibers are described, for example, in US Pat. No. 37.
No. 45061, Japanese Utility Model Application Laid-Open No. 54-82115, and Japanese Patent Application Laid-Open No. 61-83307. The drawback common to these is that the bending rigidity is poor, and particularly in a cut pile carpet, the pile tends to fall and a satisfactory product cannot be obtained.

Further, the modified hollow fiber is described in, for example, JP-A-48-42134, JP-A-59-36714 and JP-B-2-8044. When these are used for a cut pile carpet, there is a problem in that the hollow portion is easily broken or crushed and falls down, and the wear resistance of the mountain portion is extremely inferior, and it easily becomes fibrillated when used for a long time.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in cut pile carpet,
It is to provide a hollow crimped yarn suitable for producing a cut pile carpet having sufficient bulkiness, napping property, and durability.

[0009]

The above object can be achieved by the present invention described below. According to the constitution of the present invention, in a hollow crimped yarn, among the single yarns forming the hollow crimped yarn, three peak portions whose cross-sectional shape protrudes to the outside, three troughs and one hollow And the shape of the peak portion is such that the extension crossing angle of the opposing side lines forming the peak portion is −10 degrees or less.
It is +10 degrees, the thickness at the position corresponding to 1/2 of the height of the peak portion is 5 to 20 μ, and the thickness of the thinnest portion of the annular portion formed by the valley portion and the hollow portion is 5 to 5. 20μ
And a single yarn having a crimp elongation of 5 to 25% occupies at least 70% of the total number of single yarns.

It is preferable that the hollow crimped yarn is mainly nylon 6, and the hollow crimped yarn has 50 to 10%.
It is preferable to contain 00 ppm of copper, and it is further preferable that the hollow crimped yarn contains 0.03 to 0.5% by weight of titanium oxide.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The hollow crimped yarn according to the present invention means a fiber formed of a thermoplastic polymer such as polyamide, polyester or polyolefin.

When the hollow crimped yarn is polyamide type nylon 6, it is particularly preferable because it excels in dyeability and can be dyed in the form of a wide carpet and has good productivity, and also has excellent napping property and abrasion resistance. ..

FIG. 1 is a cross-sectional view showing an example of a single yarn mainly constituting in the hollow crimped yarn of the present invention. FIG. 2 is a cross-sectional view showing an example of a single yarn mainly constituting in the hollow crimped yarn of the present invention. FIG. 3 is a plan view of a spinneret hole used to obtain a hollow crimped yarn having the cross-sectional shape shown in FIGS. 1 and 2. FIG. 4 is a schematic explanatory view of a method for measuring the crimp elongation rate of the hollow crimped yarn. FIG. 5 is a schematic explanatory diagram of a method for measuring the degree of deformation in the cross-sectional shape of the hollow crimped yarn.

In FIG. 1, in the center line X of the mountain portion 1, the distance from the intersection a of the center line X and the circumscribed circle of the valley portion 2 to the intersection b of the center line X and the tip of the mountain portion 1 is defined as: The height h of the mountain portion 1, the straight line connecting the point e on the ridgeline at 1/3 of the height h of the mountain portion 1 and the point f on the ridgeline at 2/3 is the lateral line, and the lateral line A is translated. Formed by the side line A1 and an angle formed by the side line B when facing each other in the mountain portion 1, that is, the side line A
The angle formed by the extended intersection between the side line B and the side line B is α, the thickness of the portion corresponding to 1/2 of the height h of the mountain portion 1 is β, and the portion sandwiched between the two mountain portions 1 is the valley portion 2. The thickness of the thinnest portion of the valley portion 2 is γ, and the central space is the hollow portion 3.

In the hollow crimped yarn of the present invention, α is -10 ° to + 10 ° and β
Is 5 μ to 20 μ and γ is 5 μ to 20 μ, and by satisfying the above α, β and γ requirements, breakage and crushing of the cut pile are significantly reduced and a satisfactory nap feeling is obtained. It is possible to realize a cut pile carpet that can be expressed and has excellent durability that hardly fibrillates even after long-term use.

A more preferable range of α is −5 ° to +5.
And particularly -5 ° to -1 °, that is, a mode in which it increases toward the tip as shown in FIG. 2 is particularly preferable. A more preferable range of β is 8 μ to 16 μ, and a further preferable range of γ is 8 μ to 16 μ.

A single yarn having a cross section as shown in FIGS. 1 and 2 can be obtained by a general method through a spinneret having a specially shaped spinneret hole 4 as shown in FIG. The width and length of the gap of the special shape hole and the gap of the abutting portion can be arbitrarily changed, and the width of the gap may be gradually expanded outward.

In the hollow crimped yarn of the present invention, it is essential that the crimp elongation S (%) defined by the following formula is 5% to 25% in the single yarn mainly constituted. S = (L1−L0) / L0 × 100 L0: Length under load of 2 mg / d L1: Length under load of 100 mg / d The above-mentioned crimp expansion ratio is hollow as shown in FIG. 4 (A). Fix one of the crimped yarns upward, measure the length L0 of the yarn with a load of 2mg / d applied to the other, and fix one of the hollow crimped yarns upward as shown in Fig. 4 (B). And 100m to the other
The length L1 of the yarn is measured under a load of g / d.

The crimp elongation S is measured by immersing the fiber in a relaxing state in boiling water at 100 ° C. for 10 minutes and then naturally drying at 25 ° C. in an environment of 65 RH% for 24 hours.
This method is also followed when measuring pile-pile fibers from a cut-pile carpet.

By setting the crimp elongation S within the range of 5 to 25%, it is possible to avoid the so-called see-through feeling in which the base of the pile is transparent and the so-called felt feeling in which the side faces of the threads are randomly intermingled, and it is possible to adjust the appearance. A high cut pile carpet can be obtained, and the more preferable range of the crimp elongation S is 8%.
~ 18%.

The hollowness of the hollow crimped yarn is defined as the percentage of the cross-sectional area of the hollow portion with respect to the cross-sectional area of the entire single yarn including the hollow portion.

In the hollow crimped yarn of the present invention, the ratio of the single yarns mainly constituting the hollow crimped yarn of the present invention (hereinafter referred to as single yarn ratio) is set to 70% or more of the total number of single yarns. It is possible to obtain a cut pile carpet that is resistant to fibrillation even after long-term use and has excellent durability.

In the hollow crimped yarn of the present invention, the hollow ratio is not particularly limited, but the range of 10% to 20% is particularly preferable because it has an excellent matting effect, a large compression work amount and a volume feeling. ..

The degree of deformation (M) of the hollow crimped yarn is measured by the method shown in FIG. Three mountain parts 1 in FIG.
The diameter (D) of the circle inscribed in the tip b of the circle is measured, and the diameter (d) of the circle circumscribed in the three valleys 2 is measured to obtain M = D / d.

In the hollow crimped yarn of the present invention, the degree of deformation is not particularly limited, but the degree of deformation (M) is preferably in the range of 1.5 to 3.5 in terms of the balance between softness and volume. In particular, the range of 2.0 to 3.0 is preferable.

The hollow crimped yarn of the present invention contains 50 to 100 copper.
By containing 0 ppm, heat resistance and light resistance are remarkably improved, and it is more preferable for harsh applications such as car mats and entrance mats that receive ultraviolet rays and heat. Also,
It goes without saying that an antioxidant may be contained if necessary.

The hollow crimped yarn of the present invention contains titanium oxide of 0.
It is more preferable that it is contained in an amount of from 03 to 0.5% by weight, which provides a matte effect and provides a carpet with a dull and dignified luster.

The hollow crimped yarn of the present invention is obtained by heat-melting a polymer, spinning from a spinneret having a plurality of specially shaped holes, and air-cooling,
It is obtained by supplying oil, subsequently stretching it to 2.5 to 4.5 times, crimping it, and confounding it if necessary. In this process, spinning, drawing, crimping, and imparting entanglement may be sequentially performed individually, but a continuous continuous process is efficient and preferable.

[0029]

【Example】

Examples 1 to 3, Comparative Examples 1 to 5 Nylon 6 chips having a sulfuric acid relative viscosity of 2.84 are used at 280 ° C.
Was melted in the above step and spun using a die having a large number of specially shaped holes as illustrated in FIG. At this time, a die having different numbers of specially shaped holes, a width and a length of the gap, a gradually increasing rate of the gap toward the outside and a gap of the abutting portion was prepared and used. The spun yarn is sprayed with air at 17 ° C. and 90 RH% to cool it, and after oiling, the surface speed is 900
m / min to a room temperature roller, followed by drawing to a heated roller with a surface speed of 2700 m / min to draw and preheat the yarn, continuously supplying it to the crimping nozzle with superheated steam. After crimping in the overfeed state, 15 entangles / m were entangled by passing through a entanglement nozzle with high-speed air, and then wound with a tension of 130 g to obtain a hollow crimped yarn of 1300 denier.

At this time, various hollow crimped yarns were obtained by sequentially replacing the die with different sizes of the specially shaped holes and changing the temperature of the heating roller and the temperature of the superheated steam supplied to the crimping nozzle. The degree of deformation of the single yarns mainly constituting these hollow crimped yarns was 2.5 to 2.7 and was almost constant in all cases. Using the hollow crimped yarn obtained in this manner, tufting was performed so that the gauge was 1/8 inch, the number of stitches was 9 pieces / inch, and the pile height was 6.5 mm, and various weights of 330 g / m ² were obtained. A cut pile carpet was obtained.

The following table shows the results of the sensitive evaluation of this cut pile carpet. The symbols showing the evaluation points in the table are the symbols showing the preference as a cut pile carpet, and have the following meanings. ○ ・ ・ ・ ・ Particularly preferable △ ・ ・ ・ ・ Preferred × ・ ・ ・ ・ Not said to be preferable Table 1 Example Comparative Example No. 1 2 3 1 2 3 4 5 α (°) 8 0-9 0 0 12 8 0 β (μ) 18 9 5 5 22 4 18 21 9 γ (μ) 18 9 6 4 21 18 22 9 S (%) 8 15 23 15 15 15 8 26 15 15 Hollow ratio (%) 20 12 12 12 12 20 20 9 12 Single yarn ratio (%) 95 73 73 98 95 98 93 93 99 67 Standing feeling ○ ○ ○ × × × △ × Durability ○ ○ ○ × × × × × Ground transparency △ ○ ○ △ △ △ × △ Felt feeling ○ ○ ○ × × × × × Matte feeling ○ ○ ○ × △ × △ △ Soft feeling △ ○ ○ △ △ △ × △ Volume feeling ○ ○ ○ × × × △ △

[0032]

EFFECTS OF THE INVENTION The hollow crimped fiber of the present invention has appropriate bending rigidity and excellent abrasion resistance, and particularly in cut pile carpets, napped feeling, durability, matte feeling, soft feeling. Since it has the characteristics of being rich in volume, and having little feeling of see-through and felt, car mats and entrance mats,
Floor mats such as tile carpets, playground mats,
It can be preferably used for hot carpets and general carpets.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a single yarn mainly constituting in the hollow crimped yarn of the present invention.

FIG. 2 is a cross-sectional view showing an example of a single yarn mainly constituting in the hollow crimped yarn of the present invention.

FIG. 3 is a plan view of the spinneret effect used to obtain the hollow crimped yarn having the cross-sectional shape shown in FIGS. 1 and 2.

FIG. 4 is a schematic explanatory diagram of a method for measuring a crimp elongation rate of a hollow crimped yarn.

FIG. 5 is a schematic explanatory diagram of a method for measuring side lightness in a cross-sectional shape of a hollow crimped yarn.

[Explanation of symbols]

 1 mountain part 2 valley part 3 hollow part 4 mouth hole A side line B side line A1 parallel line of A side line α relative angle of side line β thickness of mountain part γ thickness of valley part L0 yarn length L1 yarn length D mountain Diameter of the circumscribed circle of the part d Diameter of the inscribed circle of the valley

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location D02J 1/22 Q // A47G 27/02 D 7137-3K

Claims (4)

[Claims] 1. A hollow crimped yarn, wherein among the single yarns forming the hollow crimped yarn, three crests, three troughs and one hollow part whose lateral cross-sectional shape protrudes to the outside. The ridge portion has a shape in which the extension crossing angle of the opposing side lines forming the ridge portion is −10 degrees to +10 degrees, and the thickness at a position corresponding to ½ of the height of the ridge portion. Is 5 to 20μ,
The thinnest part of the annular part formed by the valley part and the hollow part has a thickness of 5 to 20 μm and a crimp extension ratio of 5
Hollow crimped yarn, characterized in that the single yarn, which is ˜25%, accounts for at least 70% of the total number of single yarns. 2. The hollow crimped yarn according to claim 1, wherein the hollow crimped yarn is mainly nylon 6. 3. The hollow crimped yarn according to claim 1, wherein the hollow crimped yarn contains 50 to 1000 ppm of copper. 4. The hollow crimped yarn according to claim 1, wherein the hollow crimped yarn contains 0.03 to 0.5% by weight of titanium oxide.