JP2933327B2 - Core / sheath composite yarn - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a yarn having excellent heat absorption and heat storage properties suitable for use in winter clothing.

(Prior Art) In recent years, in the field of winter clothing, attempts have been made to increase the sustainability of the heat retaining effect by using fibers containing ceramic fine particles having a far-infrared radiation ability, for example, Japanese Patent Application Laid-Open No. 62-238811. Many have been proposed in the gazette.

However, such fibers contain a substance with high thermal conductivity called ceramics, so the thermal conductivity of the whole fiber is high and the absorbed heat is easily radiated to the outside, so the heat retaining effect of ceramics is sufficient. There is a disadvantage that it is not exhibited.

In order to solve the above-mentioned drawbacks, the present inventors have disclosed in Japanese Patent Application No. 63-257879 a method in which fine particles having far-infrared radiating ability are contained in a synthetic fiber multifilament to form a thread loop or a tarmi. At the same time, we proposed a processed yarn that can prevent heat dissipation by forming an air layer in the yarn.

However, this processed yarn was not sufficiently satisfactory in terms of heat absorption rate and heat storage.

In other words, the existence of a large amount of air layer in the yarn is not sufficient for the heat storage effect, so the solar energy is absorbed when the weather is fine. However, there is a drawback that the cold sensation is rather increased due to a rapid temperature change.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned drawbacks and to provide a core / sheath type composite yarn having good heat absorption and heat storage properties. is there.

(Means for Solving the Problems) The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, a yarn in which ceramic filaments having a far-infrared radiation capability are contained in a filament is used as a sheath yarn. A core / sheath type composite yarn using a normal synthetic fiber multifilament yarn with low conductivity as the core yarn, and if this yarn is formed with loops, tarmi and entanglement, it has unprecedented excellent heat absorption and heat storage The present inventors have found that a yarn having

That is, in the present invention, a synthetic fiber multifilament yarn (thread A) containing 0.1 to 20% by weight of ceramic fine particles having a far-infrared radiation ability mainly forms a sheath portion,
An ordinary thermoplastic synthetic fiber multifilament yarn (yarn B) is a core-sheath type composite yarn mainly formed with a core portion, and the weight ratio of the yarn A to the yarn B is 20:80 to 70:30. And a core / sheath type composite yarn characterized in that a loop, a tarmi and an entanglement are formed.

 Hereinafter, the present invention will be described in detail.

The core / sheath type composite yarn of the present invention is a yarn in which the yarn A containing ceramic fine particles having a far-infrared radiation ability mainly forms a sheath portion, and is a normal thermoplastic synthetic fiber multifilament yarn. It is necessary that B mainly forms the core.

It is important for yarns for winter clothing to absorb solar energy more quickly and to retain the absorbed heat in the clothing for a long time after shifting to cloudy weather, that is, in a state where the solar energy drops. Therefore, the core of the present invention
In the sheath-type composite yarn, a normal yarn B having a low thermal conductivity is mainly disposed in a core portion, and the periphery thereof is covered with a ceramic filament-containing multifilament group of the yarn A.

It is preferable that the yarn A constituting the sheath has a gap between filaments, particularly between the filament group of the core yarn B. Further, the core-sheath composite yarn of the present invention,
A large number of loops, tarmi and entanglements are formed in the entire yarn, and a large number of minute spaces between filaments are formed. For this reason, the heat absorbed by the yarn A stays in the minute space, and the heat is absorbed to the outside. Dissipation of heat is prevented, and the heat storage effect can be further enhanced.

Further, in order to efficiently obtain the above-described heat absorption and heat storage effect, 70% or more, particularly 80% or more, of the surface of the yarn B constituting the core is covered with the yarn A constituting the sheath. Is preferred.

The far-infrared radiation ability referred to in the present invention refers to the ability to absorb electromagnetic waves in a wavelength region other than far-infrared rays, convert them into far-infrared rays, and emit. Examples of ceramics having such a capability include oxides such as manganese, zinc, iron, copper, and gobalt and mixtures thereof, oxides and carbides such as zirconium, hafnium, silicon, boron, and tantalum.

In the core / sheath type composite yarn of the present invention, the amount of the ceramic fine particles having far-infrared radiation ability to be mainly contained in the yarn A forming the sheath portion needs to be 0.1 to 20% by weight. -15% by weight is more preferred. If the content is less than 0.1% by weight, the intended endothermic effect cannot be sufficiently obtained, while if it exceeds 20% by weight, the strong elongation of the filament is undesirably reduced.

When producing synthetic fibers such as polyamide and polyester, the yarn A containing the ceramic fine particles is mixed with the ceramic fine particles in a process prior to spinning and then spun. And a composite spinning method in which the polymer not containing is spun so as to form a sheath.

Further, examples of the yarn B having a low thermal conductivity that constitutes the core portion include polyester-based, polyamide-based, and acrylic-based multifilament yarns. Thread A
May be either a raw yarn or a crimped yarn, but a crimped yarn is preferred because fine spaces are formed due to the crimp form of the filament itself, and the heat storage effect is improved.

The yarn A and the yarn B constituting the core / sheath type composite yarn of the present invention
Weight ratio must be between 20:80 and 70: 30: 7
The ratio is more preferably 0 to 60:40. When the ratio of the yarn A is smaller than the above range, the heat absorbing effect of the ceramic fine particle-containing filament having far-infrared radiation ability cannot be obtained satisfactorily. On the other hand, when the ratio of the yarn A is larger than the above range, the heat absorption increases. However, the ratio of the yarn B that stores the heat decreases, and the heat storage effect decreases, which is not preferable.

 Next, a description will be given based on the drawings of the present invention.

FIG. 1 is a schematic side view showing one embodiment of the core / sheath type composite yarn of the present invention. In FIG. 1, the composite yarn Y ₃ is
The yarn B containing the ceramic fine particles having a far-infrared radiating ability is arranged in the sheath, and the yarn B is disposed in the sheath.
A large number of loops and lumps are formed in the yarn, and a large number of minute spaces 3 exist between the filaments.

Next, an example of a method for producing the core / sheath type composite yarn of the present invention will be described.

FIG. 2 is a conceptual process diagram for manufacturing the core / sheath type composite yarn having the loop and the tarmi shown in FIG. In FIG. 2, the yarn A drawn from the pan 8 is fed to the false twisting area via the feed roller 13 and twisted by the false twist spindle 15 between the feed roller 13 and the delivery roller 16 by the heater 14. Heat fixed, delivery roller
After 16 passes, a fluid disturbance nozzle with a predetermined overfeed rate
Supplied to 17.

On the other hand, the yarn B pulled out from the pan 4 is supplied to the fluid agitation processing nozzle 17 at a predetermined overfeed rate via a feed roller 18 and is subjected to a fluid agitation processing together with the false twisted yarn of the yarn A. take-off is a composite yarn Y ₃ having a loop fluff by 19.

As the above-mentioned fluid disturbance processing nozzle, for example,
A so-called Taslan nozzle or the like described in JP-A-88969 or JP-B-35-1673 is used.

Further, the overfeed rate in the present invention is: Is calculated by (A: the speed of the yarn supplied to the fluid agitation processing nozzle, b: the speed of the yarn taken from the fluid agitation processing nozzle) In order to produce a core / sheath type composite yarn having a loop and a tarmi, The peripheral speed of the feed roller 18 and the delivery roller 16 is set faster than that of the delivery roller 19, and the delivery roller 16 is
In this case, the yarn B has a core / sheath structure in which the yarn B has a core portion and the yarn A has a sheath portion, and has a large number of loop fluffs. Can be made with thread. Further, it is preferable to set the overfeed rate at the time of performing the fluid disturbance treatment so that the yarn A is approximately 7% or more larger than the yarn B.

(Operation) The core / sheath type composite yarn of the present invention has a heat absorbing effect in the sheath portion and a heat accumulating effect in the core portion, and further, a loop, a tarmi and an entanglement are formed in the yarn.

That is, since the yarn A containing the ceramic fine particles having far-infrared radiation capability, which constitutes the sheath portion, is directly exposed to sunlight, the temperature rise rate of the entire composite yarn is increased. At the same time, the heat absorbed by the yarn A actively warms the yarn B constituting the core, and the filament temperature of the yarn B gradually increases. Since the yarn B thus warmed has a low thermal conductivity, heat dissipation can be prevented.

Furthermore, since a large number of minute spaces between the filaments are formed by the loop fluff, heat convection occurs in the yarn, and the heat storage effect of storing the heat absorbed by the minute spaces can be improved.

This effect is particularly significant during the transition from fine weather to cloudy weather. In general, sufficient energy is given in fine weather, so there is almost no drop in temperature even when heat is dissipated at the same time.However, in cloudy weather, the amount of heat dissipated is larger than the amount of heat energy absorbed, so avoid temperature drop. I can't. This phenomenon appears more conspicuously when the entire yarn is composed only of a multifilament yarn containing ceramic fine particles. However, the fabric knitted and woven with the yarn having the configuration as in the present invention can suppress a sharp decrease in the temperature in the garment or the sensible temperature due to the dissipation of heat when the heat energy is reduced as described above.

(Examples) Next, the present invention will be specifically described with reference to examples.

In addition, evaluation of the heating rate, endothermic property, and heat storage property was performed by the following method.

(1) Heating rate In a constant temperature and humidity room with a room temperature of 20 ° C and a humidity of 60%, a 500 W Matsushita Electric REF lamp was used as an energy source, the distance between the energy source and the fabric was set to 1 m, and irradiation of the REF lamp was started. The time required for the fabric surface temperature to rise by 3 ° C. was measured.

(2) Endothermic property The cloth surface temperature was measured 10 minutes after the start of irradiation.

(3) Heat storage property After irradiating for 10 minutes, the REF lamp was switched to 100 W, and the time required for the fabric surface temperature to decrease by 3 ° C. was measured while irradiating the REF lamp.

Example 1, Comparative Examples 1 to 5 0.07% by weight and 2.0% by weight of zirconium carbide fine particles
Are melt-spun and then drawn, and a multifilament yarn (yarn A) obtained by drawing and a nylon 6 drawn multifilament yarn containing no fine ceramic particles (yarn B) In accordance with the processing steps shown in FIG. 2, processing was carried out under the conditions shown in Table 1 to obtain a core / sheath composite yarn having loop fluff having the structure shown in Table 2.

The number of false twists (T / M) of the yarn (A) was set to 4000 in Example 1 and Comparative Examples 1 and 2, 6000 in Comparative Example 3, and 2800 in Comparative Example 4.

In Comparative Example 5, the conditions were set so that the yarn (A) was arranged at the core and the yarn (B) was arranged at the sheath, and the yarn (B) at that time was set.
The number of false twists (T / M) was 3,300.

Next, the yarns obtained in Example 1 and Comparative Examples 1 to 5 were used independently for both the warp and the weft, and the warp density was 120 yarns /.
A plain woven fabric having a density of 2.54 cm and a weft density of 66 yarns / 2.54 cm was prepared.

 Table 2 shows the evaluation results of the obtained woven fabric.

As is clear from Table 2, the fabric having the core-sheath type composite yarn having the loop fluff obtained in Example 1 absorbs light energy quickly and in large amounts, and absorbs the absorbed heat. Lasted for a long time. Further, a jumper jacket was trial-produced using the cloth of Example 1, and as a result of a try-on experiment, the temperature in the clothes did not decrease rapidly even after shifting from fine weather to cloudy weather, and excellent heat storage properties were exhibited.

On the other hand, none of the fabrics obtained in Comparative Examples 1 to 5 satisfied both the heat absorbing property and the heat storing property.

(Effect of the Invention) The core / sheath type composite yarn of the present invention has an excellent heat absorption rate and heat absorption amount because the sheath portion is formed of a multifilament yarn containing ceramic fine particles having far-infrared radiation ability. In addition, since the core is made of a fiber having a low thermal conductivity, the heat once absorbed from the sheath yarn is hardly dissipated.

Furthermore, since the core / sheath type composite yarn is formed with loops and tarmi, there are a lot of minute spaces due to the loops and tarmi, further improving the heat insulation properties, and providing more heat to the outside than conventional heat insulating materials. The remarkable improvement of the radiation prevention of ash.

As described above, since the yarn has both the effective absorption of heat energy and the excellent heat retention and storage property when the heat energy is reduced, the fabric using the yarn can be made into an extremely warm garment. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a core / sheath type composite yarn of the present invention, and FIG. 2 is a conceptual process diagram for producing the composite yarn of FIG. A: Synthetic fiber multifilament yarn containing ceramic fine particles capable of emitting far-infrared radiation B: Normal thermoplastic synthetic fiber multifilament yarn 3: Micro space

────────────────────────────────────────────────── (5) Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI D02G 3/02 D02G 3/02 (56) References JP-A-62-238811 (JP, A) JP-A-2-104732 (JP) , A) JP-A 1-272839 (JP, A) JP-A 63-211314 (JP, A) JP-A 3-104949 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB Name) D02G 3/00-3/36 D01F 1/10 D01F 6/90-6/92

Claims (1)

(57) [Claims] 1. Synthetic fiber multifilament yarn (yarn A) containing 0.1 to 20% by weight of ceramic fine particles having a far-infrared radiation ability mainly forms a sheath portion, and ordinary thermoplastic synthetic fiber multifilament yarn (yarn) (B) is a core-sheath type composite yarn mainly formed with a core portion, wherein the weight ratio of the yarn A to the yarn B is 20:80 to 70:30, and a loop, a tarmi and entanglement are formed. A core / sheath type composite yarn characterized by being made.