JP2001303401A - Knit fabric for underwear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a knit fabric for underwear scarcely causing the lowering of electromagnetic wave shielding performances by friction, having a good appearance and reduced in a fear for metallic allergy during the wearing with out roughening. SOLUTION: This knit fabric for the underwear is composed of a double knit fabric obtained by knitting an interlayer from polyamide-based fibers or polyester fibers in which silver or copper vapor is deposited and knitting the surface side (the side out of contact with the skin) and the back surface side (the side in contact with the skin) so as not to contain the metal-coated fibers therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knitted fabric for underwear which has almost no decrease in electromagnetic wave shielding performance due to friction, has a good appearance, and is less susceptible to metal allergy when worn.

[0002]

2. Description of the Related Art Fabrics for shielding electromagnetic waves are mainly used to prevent malfunctions of electric appliances and to prevent radiation of electromagnetic waves to the human body. As a method for obtaining such a cloth, there is a method of depositing silver or copper / nickel on the cloth (for example, Japanese Patent Application Laid-Open No. 8-176962). It is preferable that the portion where the metal is deposited does not touch the skin. For this reason, a method of depositing silver, copper, nickel, or the like on the fabric is not suitable.

[0003] The applicant of the present application has already filed Japanese Patent Application No. 11-1.
No. 06402, a metal is deposited by disposing a thread on which silver or copper is deposited on the front side of the knitted fabric and disposing an organic fiber containing no thread on which the silver or copper is deposited on the back side of the knitted fabric. Is provided with a knitted fabric that does not touch the skin, but silver or copper is vapor-deposited on the surface side to touch or rub against external substances when wearing fabric or washing. It is not preferable because the yarn is damaged and the electromagnetic wave shielding ability is reduced.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a metal-deposited portion from touching the skin, and furthermore, even if there is damage due to contact with an external substance, the electromagnetic wave shielding ability does not decrease. It is intended to provide a knitted fabric worn on the skin.

[0005]

That is, the present invention provides an intermediate layer formed of a metal-coated fiber and a front side layer and a back side layer formed of an organic fiber not containing the metal-coated fiber. This is an underwear knitted fabric composed of a double knit fabric. In the knitted fabric of the present invention, in order to efficiently shield electromagnetic waves, it is important that the intermediate layer is knitted only with metal-coated fibers. In order to prevent allergy concerns, the back side that is in contact with the skin is woven so that the metal-coated fiber does not appear, and it is included on the surface so that the metal-coated fiber is not damaged by contact with external substances etc. It is important that the knitted fabric is knitted so that it is not knitted, and in order to obtain such a knitted fabric, it is essential to use a double knitted fabric.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, any of synthetic fibers, semi-synthetic fibers, regenerated fibers, natural fibers and the like can be used as a fiber material for coating a metal. Therefore, it is preferable to use polyamide fibers or polyester fibers. Further, the metal-coated fiber can be used in any form of a long fiber filament yarn or a spun yarn. In this case, the fineness of the yarn is not particularly limited.
A decitex to about 300 decitex is preferable. The means for coating the fiber material such as polyamide fiber or polyester fiber with metal is not particularly limited, and may be a vapor deposition method or a plating method. Of course, known metal-deposited fibers currently on the market can also be used. As such a fiber, for example, a silver-deposited nylon fiber [trade name “X-static” (registered trademark) ”of Sauquoit can be exemplified.

[0007] As the type of metal to be coated on the fiber material,
Silver or copper are preferred, they may be coated alone or both may be coated.

In the present invention, it is important to form an intermediate layer of a knitted fabric by using a yarn made of a metal-coated fiber.
If the yarn forming the intermediate layer contains material fibers that are not metal-coated, not only the electromagnetic wave shielding ability at that portion is lost, but also the contact between the metal-coated fibers is hindered, so that the knitted fabric as a whole The electromagnetic wave shielding effect is lowered, which is not preferable. Therefore, as the intermediate layer,
It is important to knit so that only silver or copper coated fibers are placed. However, as long as the effects of the present invention are not impaired, the yarn constituting the intermediate layer may contain a small amount of fibers other than the metal-coated fibers.

Next, it is important to knit the back side (the side in contact with the skin) of the knitted fabric of the present invention so that the metal-coated fibers do not appear. The surface of the metal-coated fiber is rough, and when touched directly on the skin, it becomes rough and uncomfortable. Some users are allergic to metals, so it is important to avoid direct contact with the skin.

On the other hand, on the surface side (the side not in contact with the skin), it is important to knit so as not to include metal-coated fibers in order to prevent the electromagnetic wave shielding ability from being lowered by the contact of an external substance. If the metal-coated fiber is present on the surface side and the thread is cut or the metal is peeled off due to contact with an external substance, the contact between the materials is interrupted, and the electromagnetic wave shielding ability is reduced.

As the fibers constituting the front side and the back side of the knitted fabric, any of synthetic fibers, semi-synthetic fibers, regenerated fibers, natural fibers and the like can be used as long as they do not contain metal-coated fibers as described above. is there. Further, as the yarn composed of these fibers, any yarn form of a long fiber filament yarn or a spun yarn can be used. In this case, the fineness of the yarn is not particularly limited, and for example, a yarn of about 30 dtex to about 300 dtex is preferably used in the case of a multifilament yarn.

For knitting as described above, a double knitting machine may be used. For example, in the knitting structure shown in FIG. 1, a yarn made of a metal-coated fiber is used as a yarn utilizing the needles on both the dial side and the cylinder side. Used, knitted with a tack so that the fiber does not appear on the front and back of the knitted fabric, dial side,
Knitting may be performed using a thread made of a fiber other than the metal-coated fiber as a thread using the needle on one of the cylinders.

[0013]

Hereinafter, the present invention will be described with reference to Examples.
This does not limit the scope of the present invention.

Example 1 Using a 22 gauge 30 inch circular knitting machine, knitting was performed using the knitting structure shown in FIG. 1 and the yarns shown in Table 1 to knit a double knit fabric. The dough was washed with water and set at 140 ° C. No silver-evaporated nylon yarn appears on the front and back sides of the obtained knitted fabric, and the tacked intermediate layer is composed of only silver-evaporated nylon yarn. When the shielding of the electromagnetic wave was measured, it was 40 db at 0.8 GHz. After the surface of the knitted fabric was worn by a method according to a wear strength test (JIS L 1094C method; load 250 g × 300 times), the shielding of electromagnetic waves was measured by the KEC method (near field) to be 0.8 GHz. At 4
0 db, and no decrease in electromagnetic wave shielding ability due to wear was confirmed.

Comparative Example 1 A double knit fabric was knitted by using a 22-gauge 30-inch circular knitting machine with the knitting structure shown in FIG. 1 and using the yarn shown in Table 1. The knitted fabric was washed with hot water and set at 140 ° C. On the front side and the back side of the obtained knitted fabric, silver-deposited nylon yarn did not appear, but the intermediate layer contained ordinary polyester yarn in addition to silver-deposited nylon yarn. When the shielding of electromagnetic waves was measured by the KEC method (near field), it was 15 db at 0.8 GHz.

Comparative Example 2 A double knit fabric was knitted by using a 22-gauge 30-inch circular knitting machine with the knitting structure shown in FIG. The knitted fabric was washed with hot water and set at 140 ° C. The resulting knitted fabric had only silver-evaporated nylon yarns on the surface side. When the shielding of the electromagnetic wave was measured by the KEC method (near field), it was found to be 0.
It was 50 db at 8 GHz. However, the surface of this knitted fabric was subjected to a wear strength test (JIS L 1094C method; load 250 g).
(300 times), the shielding of the electromagnetic wave was measured by the KEC method (near field), and it was 30 db at 0.8 GHz, and the electromagnetic shielding ability was reduced due to the abrasion.

Comparative Example 3 Using a 22 gauge 30 inch circular knitting machine, knitting was performed using the knitting structure shown in FIG. 1 and the yarns shown in Table 1 to knit a double knitted fabric. The knitted fabric was washed with hot water and set at 140 ° C. The obtained knitted fabric had only silver-evaporated nylon yarns on the back side. When the shielding of the electromagnetic wave was measured by the KEC method (near field), it was found to be 0.
It was 50 db at 8 GHz, but had a rough touch due to the presence of silver-evaporated nylon yarn on the back side (side that touches the skin).

[0018]

[Table 1]

[0019]

The knitted fabric to be worn according to the present invention is excellent in electromagnetic wave shielding properties, has a good touch, and has no concern about metal allergy and the like. There is no loss of ability.
This can provide an excellent undergarment, for example, to a person suffering from a heart and wearing a pacemaker without fear of a pacemaker failure due to electromagnetic waves from a mobile phone or the like, and is of high practical value.

[Brief description of the drawings]

FIG. 1 is a knitting structure diagram of a double knit fabric which is an example of a knitted fabric worn under the skin of the present invention.

Claims (3)

[Claims] An underwear composed of a double knit fabric comprising an intermediate layer formed of a metal-coated fiber and a front side layer and a back side layer formed of an organic fiber not containing the metal-coated fiber. Knitted fabric. 2. The underwear knitted fabric according to claim 1, wherein the fiber material of the metal-coated fiber is a polyamide fiber or a polyester fiber. 3. The underwear knitted fabric according to claim 1, wherein the metal of the metal-coated fiber is silver and / or copper.