JP2001032150A - Electromagnetic wave shiedling knit material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a material for always wearable clothes excellent in touch feeling without causing dermatopathy (allergy) or the like, wearable as underwear and excellent in electromagnetic wave shielding performances. SOLUTION: This electromagnetic wave shielding knit material is composed of a reversible-like knit fabric comprising electroconductive fiber yarns of 70-210 denier and natural fiber yarns of No.30-150 count cotton yarns and appearing the natural fiber yarns on one side. The knit fabric has >=6 value of evaluation of touch feeling (G-soft) according to a KES method and >=20 dB electromagnetic wave shielding ability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knit material for protecting an electromagnetic wave from an electromagnetic wave generated and leaked from an electromagnetic wave generating electronic device, and more particularly to an undergarment.

[0002]

2. Description of the Related Art Conventionally, as a measure against electromagnetic wave interference by an electromagnetic wave source, a method of wrapping the electromagnetic wave source around an electromagnetic wave blocking layer such as a metal net to prevent the electromagnetic wave has been adopted. Attempts to restructure electromagnetic shield nets (layers) at the source itself and to prevent leakage of electromagnetic waves with the increase in the number of sources of electromagnetic waves remarkably accompanying the progress of portable miniaturization of the source itself In order to meet this purpose, an electromagnetic wave shielding net (woven cloth) of a woven fabric made of a lightweight and flexible conductive fiber developed for an electromagnetic wave shielding film or for a device built-in type electromagnetic wave shielding net has been developed. , JP
0-168702, Utility Model Patent No. 301014
7, JP-A-8-176962, JP-A-10-176962
-292252.

Further, the flooding of such electronic devices increases the chances of exposure to electromagnetic waves in the manufacturing process, and furthermore, unless a complete and complete electromagnetic wave shield is implemented in each device, the general living environment such as workplaces, homes, and roads. In recent years, the spread of portable telephones has increased the chances of exposure to electromagnetic waves in recent years, and the emergence of electromagnetic waves will also interfere with the operation of cardiac pacemakers. Attempts have also been made to produce and wear clothing using a knitted woven fabric made of conductive fibers having electromagnetic wave shielding ability.

[0004] However, in the conventional practice,
Protective clothing was made with emphasis on the electromagnetic wave shield,
Since the garment is made of 100% conductive fibers, not only the essential properties such as softness, drapeability, swelling and compression characteristics, which are essential for the garment, but also the basic characteristics such as sweat absorption are not satisfied. Skin damage (allergy) due to metal of a metal film-coated conductive fiber having many electromagnetic wave shielding properties may occur, and countermeasures have been strongly desired.

[0005] A garment made of conductive fibers and a woven fabric made of ordinary garment fibers having good moisture absorption are integrally laminated as a garment construction state for always wearing and shielding generated and leaked electromagnetic waves. It is said that it is effective to solve the problem of perspiration by sewing, so that the knitted fabric made of ordinary clothing fibers with good moisture absorption comes on the inner side of the clothing. The idea is real fairness 4
No. 54165, which suggests an effective direction for solving the problem. However, necessary components for providing an effective electromagnetic wave shielding function in the knitted fabric, and inner garments (underwear) of the woven fabric There is no mention of the necessary conditions for imparting the function to be possessed as the above, and there is no disclosure of any method for forming such a woven fabric.

[0006]

As described above, the proliferation of portable small electronic devices increases the chances of exposure to electromagnetic waves in wells, and strongly demands that clothes have an electromagnetic wave blocking / protecting function. Although it has become an environment, it satisfies the so-called feelings such as softness, drapeability, swelling, compression characteristics, etc., which are essential as clothes that can be worn at all times, meets basic required characteristics such as sweat absorption, and has electromagnetic wave shielding ability There is no disclosure of a method for producing an electromagnetic wave shielding garment free from the possibility of skin damage (allergy) caused by the metal of the conductive fiber coated with a metal film. Therefore, in the present invention, it is an object of the present invention to provide a material for clothing which is excellent in texture that can be worn at all times, does not cause skin disorders (allergy), etc., and has excellent electromagnetic wave shielding performance that can be worn on underwear, which solves the above problems. is there.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and aims to produce a knitted material which has an excellent function as a constantly wearable garment, especially underwear, and has an excellent electromagnetic wave shielding ability. is there. That is, a reversible knitted fabric comprising a conductive fiber yarn of 70 to 210 denier and a natural fiber yarn of 30 to 150 cotton yarn count, wherein the natural fiber yarn appears on one side, and a texture evaluation value according to the KES method. An object of the present invention is to provide an electromagnetic shielding knit material having (G-Soft) of 6 or more and an electromagnetic shielding ability of 20 dB or more.

The role, necessary significance, and necessity of each constituent element in the present invention for solving the problems will be described in more detail. (A) Eliminating the risk of the occurrence of metal allergies in desired clothing, especially underwear In order to impart comfort to the skin, such as sweat-absorbing properties, to the underwear having an electromagnetic wave shielding ability, the essential constituent requirements are conductive fibers and natural clothing fibers,
A knit layer made of natural fibers is knitted on the inside (skin side),
In addition, a knit made of a reversible knit is used, and a knit layer made of a natural fiber is provided on one side (one side) when worn, and a knit layer made of a conductive fiber having an electromagnetic shielding function is provided on the outside.

(B) Next, in order to impart the so-called feeling such as softness, drapability, swelling, and compression characteristics, which are essential for clothing having the electromagnetic wave shielding ability of the constituent tissue of the present invention, especially underwear, reversible knitting. The natural fiber in the knit can provide a desired texture in the undergarment by appropriately selecting its fineness, so that the conductivity of the knit layer made of a conductive fiber provided to impart electromagnetic wave shielding ability to clothing can be improved. Considering the tendency of texture to deteriorate due to the stiffness of the fiber, it is a technology to control the rigidity of the knit of reversible knitting while maintaining the fineness required for imparting electromagnetic wave shielding ability without impairing the electromagnetic wave shielding ability. This is a problem that needs to be solved.

[0010] In order to solve this problem, the present invention has found that this can be achieved by reducing the fineness of natural fibers of reversible knitting, and the covering power of the electromagnetic wave shielding surface is also improved without disturbing the texture to solve the problem. It was successful.

(C) Further, in order to impart the required electromagnetic wave shielding ability to the clothing of the present invention, it is necessary to impart sufficient electromagnetic wave shielding ability to the knit layer made of conductive fibers. The hiding ability is a performance that is governed by the fineness of the used yarn of the knit layer made of conductive fibers,
In order to provide a sufficient concealing ability and a required electromagnetic wave shielding ability (covering power), 70-210
Knitting in a denier conductive fiber yarn is an essential component.

Also, since the surface area of the surface having the shielding ability increases as the denier of the single fiber constituting the yarn becomes thinner, the improvement of the shielding effect by multiple reflection in a high frequency range is also expected. The conductive fiber yarn is made from single yarn denier 2 to 8 d. Is effective for achieving this purpose.

Furthermore, it is a matter of course that the knitting structure is also an important component, and since the object is limited to clothing, especially underwear, the natural fiber yarn is knitted in a reversible shape on the skin side. Required. This can be solved by performing knitting (plating) of the conductive fiber yarn and the natural fiber yarn on the entire course, and bringing the natural fiber yarn into contact with the skin side. However, the knitting is not limited to the auxiliary thread knitting (plating), but may be performed by knitting by supplying the conductive fiber to a flat knitting machine or a rubber knitting machine by a knitting method in which the conductive fiber is coated with clothing fibers.

In the present invention, the conductive fibers forming the knit layer having an electromagnetic wave shielding property are obtained by coating a synthetic fiber such as nylon, polyester, acrylic, or polypropylene with a metal component by a method such as sputtering, vacuum deposition, or electroless plating. It is most universal and effective in the practice of the present invention that the multifilament has a denier of 2 to 8 and a denier of 2 to 8 and a denier of 70 to 210.
For example, a trade name of X-Static manufactured by Sauquit Co., which is obtained by applying silver plating to a nylon multifilament, is a typical example that is often used in practice.

In addition, as the conductive fiber forming the knit layer having the electromagnetic wave shielding function, a fiber obtained by fiberizing a conductive resin such as polyacetylene, or a single yarn made of a thin metal wire such as gold, silver, copper, or stainless steel is used. It is possible to use a 70-210 denier multifilament of 2-8 denier.

Natural fiber yarns which are constituents for imparting the required texture to the clothing and underwear to be produced include cotton, silk, hemp and the like.

Further, by replacing the natural fiber yarn with a spun yarn of rayon staple fiber, it is possible to obtain a knitted garment and underwear having excellent wearability and capable of protecting the body from electromagnetic interference.

Further, the natural fiber yarn can be worn by protecting the body from electromagnetic interference by replacing the constituent fiber with a natural fiber / rayon fiber blend spun yarn or a natural fiber / synthetic fiber fiber blend spun yarn. It is possible to obtain knitted clothing and underwear with excellent properties.

In order to attain the softness and the sweat-absorbing property in addition to the electromagnetic wave shielding ability which is the object of the present invention, a cotton count of 30 to 150 is used for the aforementioned 70 to 210.
Used in combination with denier conductive fiber yarn. As a preferred embodiment, in the plain knitting structure, the conductive fiber yarn of 100 to 210 denier is used for the natural fiber yarn of 40 to 150 yarn, and in the rubber knitting structure, the conductive fiber yarn of 70 to 210 denier is used for the 70 to 120 yarn. It is preferred to use yarn.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents and effects of the present invention will be described in more detail with reference to Examples. [Example 1] Nylon multifilament yarn (Sau) plated with silver of various deniers as conductive fibers
Xstatic made by Quit Co., Ltd.) and cotton yarns of various counts. Both fibers are aligned and plated on the entire course of a 24.5 gauge flat knitting machine. The knit surface layer is made of cotton yarn, and the back layer is conductive. A knit having a reversible knitting structure in which knits made of fibers were laminated and integrated was knitted. Using this knit, an undergarment was produced by knitting a knit layer made of cotton yarn on the inner surface side and a knit layer made of conductive fiber on the outer surface side.

The composition of the manufactured knit and the performance evaluation result of the knit (feel evaluation characteristic value of the knit: G-sof)
t, the electromagnetic wave shielding performance (dB) according to the KEC method at 800 MHz is as shown in FIG. 1, and in a knit of a reversible knitting structure of a 24.5 gauge flat knitting structure, 100 d / When a conductive fiber having a denier of 34 f or more is used, it is possible to obtain a necessary electromagnetic wave shielding ability (20 dB). Denier of conductive fiber has a great influence on electromagnetic wave shielding.

That is, as shown in FIG. 2, even if any of the conductive fiber deniers was selected, the texture showed no problem in practical use. However, the count of the cotton yarn used had an influence on the texture of the knit and the count was high. It showed a softer texture. In addition, the results of the trial underwear test give good texture without any problem in practical use, and all showed sufficient sweat absorption and did not cause metal allergy.

Example 2 Using exactly the same conductive fiber and cotton yarn as in Example 1, changing only the knit construction to 18.6 gauge rubber knitting, the two fibers were also aligned and used for all courses of the rubber knitting machine. Plating, the surface layer is made of cotton yarn,
A knit having a reversible knitting structure in which the back layer was made of conductive fibers was knitted, a trial shirt (underwear) was also prototyped, and each performance was evaluated in the same manner as in Example 1. The evaluation results are as shown in FIG. 3 and show the same results as in Example 1. However, in order to obtain the required electromagnetic wave shielding ability (20 dB), the conductive fiber knit layer forming condition: 70 d in the case of rubber knitting This indicates that a knit knitted using conductive fibers having a denier of / 34f or more is necessary, and the denier of constituent fibers required for obtaining the required electromagnetic wave shielding ability has shifted to the lower denier side as compared with Example 1. Other performance evaluation results showed the same tendency as in Example 1 as shown in FIG.

The evaluation of the performance of the knit in the above-described embodiment, that is, the evaluation of the feeling characteristics G-soft and the KEC electromagnetic wave shielding performance was performed as follows. (1) G-soft evaluation test method: KES mechanical characteristic values according to "Standardization and analysis of texture evaluation" (second edition, written by Toshio Kawabata, published by the Japan Textile Machinery Society, July 10, 1980) are as follows. 1: LT Linearity of tensile 2: WT Tensile energy per area 3: RT Tensile resilience 4: B Flexural rigidity per unit length 5: 2HB Hysteresis 6: G Shear rigidity 7: 2HG Shear angle 0.5 8: Linearity of LC compression characteristics 9: WC compression energy 10: Resilience of RC compression 11: MIU average friction coefficient 12: MMD average deviation of friction coefficient 13: SMD average deviation of surface roughness 14: T pressure 0 Thickness at 0.5 kgf / cm 15: W Weight per unit area The calculation formula is as shown in Table 1. Here, C0: constant (=
6.253), Cj, Xj (AV), and σj are coefficients as shown in Table 2.
Take the value of

(2) KEC Electromagnetic Wave Blocking Performance Evaluation Test Method: "Textile Consumer Science" Vol 40, No. 2 (199)
9) See p100-108, published by Japan Society for Textile Consumption Science

[0026]

The electromagnetic shielding knit material of the present invention is:
With the above-described configuration, the texture evaluation value by the KES method is excellent, G-Soft> 6, and excellent in sweat absorption,
Knitted underwear that can protect the body from electromagnetic wave interference that can be worn at all times can be provided with extremely high productivity.

In addition, the reversible knitted knit
The conductive fiber is laminated and coated on the clothing fiber, so that the conductive fiber does not directly contact the skin, and the clothing can be made without skin damage due to metal allergy.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 27, 1999 (July 7, 1999
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a knit configuration number and electromagnetic wave shielding performance.

FIG. 2 is a diagram showing a relationship between a knit configuration number and G-SOFT.

FIG. 3 is a diagram showing a relationship between a configuration of a knit and electromagnetic wave shielding performance.

FIG. 4 is a diagram showing the relationship between the configuration of a knit and electromagnetic wave shielding performance.

[Explanation of symbols] # 30 Knit configuration cotton count 10 Breaking performance (dB) ──────────────────────────────── ─────────────────────

[Procedure amendment]

[Submission Date] October 4, 2000 (2000.10.
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

The evaluation of the performance of the knit in the above-described embodiment, that is, the evaluation of the feeling characteristics G-soft and the KEC electromagnetic wave shielding performance was performed as follows. (1) G-soft evaluation test method: KES mechanical characteristic values according to "Standardization and analysis of texture evaluation" (second edition, written by Toshio Kawabata, published by the Japan Textile Machinery Society, July 10, 1980) are as follows. 1: LT Linearity of tensile 2: WT Tensile energy per area 3: RT Tensile resilience 4: B Flexural rigidity per unit length 5: 2HB Hysteresis 6: G Shear rigidity 7: 2HG Shear angle 0.5 8: Linearity of LC compression characteristics 9: WC compression energy 10: Resilience of RC compression 11: MIU average friction coefficient 12: MMD average deviation of friction coefficient 13: SMD average deviation of surface roughness 14: T pressure 0 Thickness at 0.5 kgf / cm 15: W Weight per unit area The calculation formula is as shown in Table 1. Here, C0: constant (=
6.253), Cj, Xj (AV), and σj are coefficients as shown in Table 2.
Take the value of

[Table 1]

[Table 2]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 9/00 D06M 11 / 00F // D06M 101: 32 (72) Inventor Shinichiro Morita Ikura, Ayabe-shi, Kyoto No. 1 Shinmachi Ishi Bath Gunze Co., Ltd. Research and Development Department (72) Inventor Katsuhiro Hori No. 1 Ikura Shinmachi Ishiba Bath in Ayabe City, Shiga Prefecture Gunze Co., Ltd. Research and Development Department F Term (Reference) 4L002 AA00 AA01 AA05 AC00 AC03 BA01 BA02 EA00 FA03 4L031 AA01 AA02 AA14 AA17 AA18 AA20 AA25 AB01 AB33 CB12 CB13 CB14 DA00 5E040 AA20 AC05 CA13 5E321 AA24 BB23 BB41 BB44 GG05 5J020 BD02 EA05 EA10

Claims (6)

[Claims] 1. A reversible knitted fabric comprising a conductive fiber yarn having a denier of 70 to 210 and a natural fiber yarn having a yarn count of 30 to 150, wherein the natural fiber yarn appears on one side. An electromagnetic shielding knit material having a texture evaluation value (G-Soft) of 6 or more and an electromagnetic shielding ability of 20 dB or more. 2. The method according to claim 1, wherein the conductive fiber yarn is a single yarn denier of 2-8.
Metal components are sputtered onto synthetic fibers such as denier nylon, polyester, acrylic, and polypropylene.
The electromagnetic shielding knit material according to claim 1, which is a multifilament applied to the surface by a method such as vacuum deposition or electroless plating. 3. The electromagnetic shielding knit material according to claim 1, wherein the conductive fiber yarn is made of a fiber obtained by fibrillating a conductive resin such as polyacetylene, or a thin metal wire such as gold, silver, copper, or stainless steel. 4. The electromagnetic shielding knit material according to claim 1, wherein the natural fiber thread is made of natural fiber, spun yarn of natural fiber / rayon fiber, or spun yarn of natural fiber / synthetic fiber fiber. 5. The material knitted in a reversible shape has a flat knitting or rubber knitting structure obtained by plating conductive fiber yarns and natural fiber yarns on all courses. Item 5. An electromagnetic wave shield knit material according to any one of Items 4. 6. The electromagnetic shielding knit material according to claim 1, wherein the knit material is used for underwear.