JP3464062B2 - Bulky polyester crimped yarn with refreshing feeling - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimped polyester yarn excellent in bulkiness and sunlight-shielding properties, which is suitable for use in refreshing clothing. 2. Description of the Related Art In order to adjust the gloss and light transmittance of polyester fiber, polyester fiber which is blended with titanium dioxide, which is one of sunlight shielding substances, to increase the degree of sunlight shielding is used for the fiber. It has come to be used as a feeling material. The present inventors have also disclosed, for example, Japanese Patent Application Laid-Open No. 5-222632.
In Japanese Patent Laid-Open Publication No. H11-157, a yarn having a deeply dyeable portion and a lightly dyeable portion in the longitudinal direction of a polyester multifilament yarn containing 3% by weight or more of a sunscreen material was proposed. However, due to the synergistic effect of the difference in cross-sectional shape and the difference in the amount of dyeing, this yarn has the effect of dyeing the deeply dyed part darker and the lightly dyeable part lighter. The feeling was due to the action of only the sunscreen material. Japanese Patent Application Laid-Open No. 5-239724 discloses a thick and thin yarn containing 3% by weight or more of a sunscreen material. However, this yarn has a thick and thin shape so as to make the yarn look cooler by the surface effect, and does not substantially enhance the cooling effect of the sunlight shielding material. [0005] As described above, the refreshing sensation of the conventional yarn containing the sunscreen material is due to the action of only the sunscreen material and its effect is limited. Had been requested. Furthermore, these conventional refreshing materials have a drawback that they lack a swelling feeling. SUMMARY OF THE INVENTION The present invention has solved the above-mentioned problems, and has a feeling of swelling in the yarn, and furthermore, a refreshing feeling is improved by a synergistic action of the sunscreen material and the form of the yarn. An object of the present invention is to provide a bulky polyester crimped yarn having a refreshing feeling. Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a polyester multifilament yarn having a high content of a sunscreen material is provided between single filaments. If a yarn length difference of 5% or more is formed,
The present inventors have found that a yarn having a feeling of richness and a bulkiness having a sun shielding effect and a swelling feeling can be obtained, and arrived at the present invention. That is, the present invention provides a core-sheath type poly- filament comprising a single filament containing at least 3% by weight of a sunscreen material as a whole yarn and a sunscreen material content of 0.8% by weight or less in a sheath portion. esters composite multifilament yarn, overflow E. the composite multifilament yarn
After heat shrunk de of 30% or more, subjected to stretching at room temperature, then was obtained by false twisting, has a yarn length difference of 5% or more between the single filaments, and the bulkiness of 200%
It is an Abstract bulkiness polyester crimped yarn having a cooling sensation, wherein the at which this or more. Hereinafter, the present invention will be described in detail. Since the bulky polyester crimped yarn of the present invention has a high content of a sunscreen material of 3% by weight or more, it is excellent in sunshade and improves the refreshing feeling from the function of sunshade. be able to. In addition, since the amount of sunlight shielding material in the sheath portion is as small as 0.8% by weight or less, it is possible to sufficiently exhibit the shrinkage characteristic of polyester, and as described later, 5% or more between single filaments. Yarn length differences can be provided. The sun-shielding material in the present invention is not particularly limited as long as it is ceramic fine particles that do not transmit visible light or infrared rays of sunlight and is compatible with polyester. In order to obtain a refreshing sensation, a substance that absorbs less sunlight and has a high reflectance,
For example, titanium dioxide, potassium titanate, zinc oxide,
A simple substance such as zinc sulfide and indium tin oxide and a mixture thereof can be mentioned. [0013] When the content of the sunscreen material such as titanium dioxide is increased, the refreshing feeling is improved, but when the amount of the sunscreen material present on the surface of the single filament is increased, the heat shrinkage property is reduced and the present invention is not improved. The crimped yarn of the invention cannot be obtained. For this reason, in order to improve the heat shrinkage property while maintaining the above-mentioned effects of the present invention, a single filament constituting the polyester multifilament yarn is provided with a large amount of sunlight shielding material in the core than in the sheath, The amount of sunscreen material in the sheath is 0.8
It is necessary to be composed of a core-in-sheath type conjugate fiber of not more than weight%. In the core-sheath type, the core portion and the sheath portion are arranged substantially concentrically, the volume ratio of the core portion is set to 70 to 90%, and the total solar shielding material of the core portion and the sheath portion is 3%. It is preferable that the content be not less than% by weight. Further, the crimped yarn of the present invention has a yarn length difference of 5% or more between single filaments and a bulkiness of 200% or more. When a crimped yarn having a yarn length difference of 5% or more between single filaments is formed into a woven or knitted fabric, a fine filament is formed on the surface of the fabric with a single filament having a large yarn length, and the soft and bulky cloth is formed. It is possible. The higher the bulk height, the more fine voids are present inside the yarn, and the more air is retained, so that the heat insulating effect can be enhanced. There is a yarn length difference between filaments and
Since it is at least 00%, air can be retained inside the yarn, and the heat insulating effect can be sufficiently enhanced. That is, an important point of the present invention is to provide a fabric obtained by knitting and weaving with a function of lowering the perceived temperature by shielding sunlight. Even in the case of a filament containing a shielding substance, the temperature of the filament itself increases somewhat due to irradiation with sunlight. However, the temperature in the clothes, that is, the temperature rise in the space of 5 cm on the back surface of the cloth differs between the case where the yarn structure has no swelling and the case where the yarn retains much air,
It was found that the effect of lowering the perceived temperature by 1 to 3 [deg.] C. was obtained in the case of the yarn in which the air was retained, as compared with the case where the yarn structure had no bulge. The present invention has been made based on the finding that the effect is remarkable if the fabric is composed of a yarn having a bulkiness of 200% or more. The yarn length difference of the single filament according to the present invention is as follows:
Mark each multifilament at 10 mm, measure the yarn length of each single filament under a load of 0.1 g / d, and determine the maximum and minimum yarn lengths of these filaments. The difference was divided by the minimum thread length and measured in the same way.
The average value of each part is expressed as a percentage. The bulk height is calculated by the following method. First, a yarn 50 cm is set in a twisting machine under a load of 0.1 g / d. Then, under a load of 0.1 g / d, the twist directions Z,
Twisting is performed at 2500 / D ^1/2 (T / M), and the resulting twisted yarn is stretched by 5% and affixed to a slide glass with a sample length of 5 cm. Next, a film with graduations at 5 mm intervals is stuck on a slide glass to divide the sample into 10 equal parts, and the yarn diameter at the intersection of the graduation and the sample is measured under a microscope. The average value of the measured yarn diameters at the 10 locations is divided by the theoretical diameter of the yarn, and the value multiplied by 100 is defined as the bulk height. The theoretical diameter refers to the diameter of the yarn when the yarn is calculated as a monofilament having a circular cross section, and is calculated by the following equation. d ₀ (μm) = 11.9 × (D / ρ) ^1/2 where d ₀ is the theoretical diameter, D is the yarn fineness (denier),
ρ is the density (g / cm ³ ). In the present invention, as the polyester,
Polyethylene terephthalate (PET) or a copolyester containing PET as a main component is preferred. Next, an example of a method for producing a bulky polyester crimped yarn having a refreshing feeling according to the present invention will be described. In the composite spinning of a polyester highly oriented undrawn yarn having a birefringence of 20 × 10 ⁻³ to 80 × 10 ⁻³ , the ratio between the core and the sheath is such that the core is 70 to 90% by volume. And the amount of sunlight shielding material in the core is 3% by weight or more, and the amount of sunlight shielding material in the sheath is 0.8% by weight or less, and 3% by weight as a whole
Composite spinning is performed by adjusting the amount of the sunscreen material as described above. Next, the obtained highly oriented unstretched yarn is heat-treated in an overfeed state to produce uneven orientation unevenness in the longitudinal direction of the yarn, and then stretched to form a thickness unevenness. Furthermore, it can be obtained by performing false twisting. As a result of the twisting in the false twisting process, the thick portion is stretched in preference to the details, and the outer layer filament is stretched to a higher degree than the inner layer filament, resulting in a difference in the extent of stretching within and between the filaments. When twisted, it becomes a bulky crimped yarn having a yarn length difference of 5% or more between single filaments and having a partly thick difference between single filaments. The overfeed ratio X (%) when the above-mentioned polyester highly oriented filament is subjected to heat treatment is 30%.
% Is preferable. Overfeed rate of 30
%, The shrinkage and thickness of the yarn are insufficient, and it is difficult to obtain a difference in yarn length due to a difference in thickness. By setting the overfeed rate to 30% or more, a thick portion and details are formed by the drawing process in the subsequent process, thereby causing a difference in yarn length within the single filament, and the yarn length difference is reduced to the yarn by the false twisting process. A swelling effect is generated, the bulk height can be increased to 200% or more, and the heat insulation effect by aeration can be enhanced. The upper limit of the overfeed rate is not particularly limited as long as the yarn runs within a stable range. The heat treatment temperature is preferably from 130 to 200 ° C. when the yarn speed is 100 m / min.
The range of (1 + X / 100) × 0.8 to (1 + X / 100) × 1.3 is preferable. Further, for the false twisting after drawing, for example, when the yarn speed is 100 m / min, the temperature of the false twist heater is set to 150 to 230
C., the number of false twists is preferably 30,000 / D ^1/2 (T / M) (D is the denier of the supply yarn), and the false twist overfeed rate is preferably -5 to -20%. The birefringence (Δn) is measured with a compensator of a polarizing microscope. Next, the present invention will be described in detail with reference to examples. Example 1, Comparative Example 1 A 110d / 24f core-sheath composite PET highly oriented undrawn yarn (core and sheath) obtained by high-speed spinning using a single particle of titanium dioxide as a sunscreen material. (Volume ratio = 75:25, titanium dioxide content = core 5% by weight, sheath 0.3% by weight) is supplied to the heat treatment apparatus at a supply speed of 120m / min, overfeed rate 70.1%, heat treatment temperature 160 ° C After that, the film was stretched 1.701 times at room temperature. Next, the obtained yarn was subjected to a false twist number of 2370 ^Z T
/ M, heater temperature 170 ° C, overfeed rate -12.2%
(Example 1). For comparison, the highly oriented undrawn yarn was simultaneously drawn and false-twisted at 1.46 times (Comparative Example 1). The crimped yarn obtained in Example 1 had a yarn length difference of 8.2% between single filaments and a bulk height of 232%. The crimped yarn obtained in Comparative Example 1 had a yarn length difference of 1.5.
% And the bulk height was only 160%. Using the 98d crimped yarn obtained in Example 1 as a warp and a weft, a warp density of 93 / 2.54 cm and a weft density of 87 /
It was woven into a flat structure at 2.54 cm. Also obtained in Comparative Example 1.
Using a 75d crimped yarn for warp and weft, warp density 123 yarns /
It was woven in a flat design at 2.54 cm and a weft density of 103 yarns / 2.54 cm.
The individual fabrics were then dyed white according to the usual polyester dyeing recipe. Next, the sunscreen effect of the obtained fabric was evaluated by the following method. In other words, a temperature measuring device is installed in a room with a constant temperature and humidity of 30 ° C and a humidity of 60%, and a 100 W white light source for photography with a central wavelength of 1 µm is used as an energy source. When the surface of the fabric was irradiated with white light for 10 minutes, the temperature was measured with a temperature sensor located 5 cm away from the back surface of the fabric. The fabric of Example 1 is a bulky and swelling fabric, and the temperature on the back side of the fabric (the temperature inside the garment) is 36.2 ° C., lower than 38.0 ° C. of Comparative Example 1; The shielding effect was excellent. On the other hand, in the case of Comparative Example 1, there was no feeling of swelling, and the texture was crisp.
The temperature in the garment was 1.8 ° C. higher than in Example 1. The bulky polyester crimped yarn having a refreshing sensation of the present invention has a bulkiness as high as 200% or more due to the difference in yarn length. The amount increases. For this reason, when used as a fabric, not only does it have a swelling effect, but also the synergistic effect of the action of the sunscreen material in the fiber and the air content can prevent the temperature inside the clothes from being increased due to sunlight. , It is possible to significantly improve the refreshing feeling.

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Claims (1)

(57) a [Claims 1. A sunlight shielding material 3 wt% or more as a whole yarn, and the solar-shielding substance content of the sheath portion made of a single filament which is 0.8 wt% or less poly-d of the core-sheath type
A scan ether complex multifilament yarns, after the composite multifilament yarn and heat yield <br/> contraction in overflow Eid of 30% or more was obtained by subjecting the stretched at room temperature, then false twisting has a yarn length difference of 5% or more between the single off Iramento and the bulkiness of not less than 200%
A bulky polyester crimped yarn having a characteristic refreshing feeling.