JPS62251137A - Magnetic shielding back fabric material for bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is used for bags, which are bag-shaped or box-shaped containers for carrying or transporting things such as business card holders, wallets, handbags, and briefcases. This relates to the lining material.

"Prior Art and Problems" As is well known, in recent years, magnetic cards such as cash cards, credit cards, and telephone cards, as well as IC cards, have become widespread and are now becoming essential items. Such magnetic cards and IC cards are usually carried in wallets, billfolds, or, depending on the person, in handbags, briefcases, and the like.

By the way, the magnetic cards and IC cards mentioned above are susceptible to magnetism and static electricity, and can be easily destroyed even if they are left in a wallet or laptop or placed near a TV or radio speaker (magnet). Loss of recorded content can also occur, as can contact with magnetic clasps on handbags or briefcases. Furthermore, not only the recorded contents are similarly lost due to static electricity, but also IC cards are easily destroyed when exposed to static electricity of about 70V.

In contrast, conventional billfolds have been provided with a structure in which metal foil is interposed between leather as the outer material and polyurethane synthetic leather as the lining material, or in which a metal-coated fabric is used as the lining material. has been done.

However, although a wallet with the former structure can provide a magnetic shielding effect, it cannot exhibit any static electricity prevention or removal function. Furthermore, not only is the lack of functionality a problem, but the surface that comes into contact when inserting and removing cards is a layer of resin such as polyurethane, so if the air is dry, static electricity can easily be generated by contact with the card. In addition, there is a problem that the flexibility of the entire billfold is reduced.

In addition, wallets with the latter structure not only have a low level of magnetic shielding effect and static electricity prevention or removal function, but also have the problem that the color tone of the lining material is limited to the color tone of the coated metal, resulting in a significant lack of aesthetic appeal.

This invention was made in view of the above circumstances, and its purpose is to provide a lining material for bags that has a high magnetic shielding effect and static electricity prevention or removal function, and that can be provided with a variety of color tones as in the past. It is about providing.

The magnetic shielding lining material for bags according to the present invention comprises copper or copper alloy ultrafine wire; 60-8 (1 wt%), conductive fiber: 2
-10 wt%, heat-fusible edge II; 1 (1 to 38 wt%) is mixed and made into paper, and this is thermo-compressed to form a flexible sheet material, which is then laminated with a polyurethane film.

The blending amount of the heat-fusible fiber is 10 to 38vt%, and the copper or copper alloy ultrafine wire and the conductive fiber are mixed and dispersed in a paper shape.
Alternatively, the amount is set based on the amount necessary for fixing the card web into a nonwoven fabric and the amount within a range that does not impede the dispersibility of other components when forming the nonwoven fabric. As the heat-fusible fibers, polyester/polyethylene fibers, polypropylene/polyethylene fibers, or mixtures thereof are used.

The blending amount of the steel or copper alloy ultrafine wire is 60 to 80 wt%.
So, the setting is that 60wt% or more is required to ensure the desired magnetic shielding property, and conversely, the blending amount is 80wt%.
If it exceeds this, paper making and card web formation become difficult.
This was done in consideration of the fact that it would be difficult to reduce the flexibility of the nonwoven fabric. This copper or copper alloy ultrafine wire has a diameter of 8 to 30 μm and a length of 38 to 30 μm.
75 cm (in the case of a dry nonwoven fabric) and 5 to 1O+x (in the case of a papermaking method), and for example, a commercially available magnet wire with a diameter of about 24 μm can be used.

These diameter and length dimensions can be appropriately set to ensure dispersibility during papermaking and flexibility of the sheet material after papermaking.

In addition, the amount of conductive fiber to be blended must be set at 2 wt to ensure the desired static electricity prevention or removal function of the product.
% or more is necessary, and conversely, even if it exceeds 10 wt%, no significant performance effect can be obtained and the cost will be high. This conductive fiber is made of, for example, synthetic resin or natural fiber, copper sulfate, primary sulfide, etc.
A material impregnated with copper or a copper compound such as cupric sulfide is used, and the length is 7 to 10 mm and the aspect ratio is 30.
It is preferable that the value is 0 or more in order to ensure static electricity prevention or removal function and maintain dispersibility during papermaking.

Moreover, the basis weight of the flexible sheet material constituted by the above-mentioned ultrafine steel or copper alloy wire, conductive fiber, and heat-fusible fiber is preferably 80 to 150 g/x'.

This is to ensure that the thickness, flexibility, etc. of the product obtained by laminating the polyurethane film by transfer or the like are not significantly different from conventional lining materials.

Examples of this invention will be shown below.

"Example" Ultra-fine magnet wire with a diameter of 24μm and a length of 50u
; Contains 75wt% copper sulfate, diameter 8μ, length 5
1 acrylic fiber; 5 wt %; 15 wt % polyester heat-fusible fiber having a diameter of 18 μm and a length of 51 um; a random web dry nonwoven fabric having a basis weight of 120 g/I” was formed; was heat-sealed to form a flexible sheet-like material, and a pigment-colored 25 μH polyurethane film was transfer laminated thereto to obtain a lining material.

The obtained lining material was placed in a screen shape at a position of 1500 Gauss in front of the magnet, and the magnetic flux density on the front side of this lining material was measured and found to be 20 Gauss. This is a magnetic shielding effect sufficient to protect magnetic cards and IC cards in everyday environments.

Further, the surface specific electrical resistance value (Ω) and the frictional charging voltage (■) of this lining material were measured at 4 cycles of phase relative humidity and found to be 8×10 10 Ω and 120V.

This is sufficient anti-static or elimination function to protect magnetic cards and IC cards under everyday environments.

"Effects of the Invention" The magnetically shielding lining material for bags according to the present invention has the above-described structure, so that the copper or copper alloy ultrafine wires with high magnetic shielding properties are uniformly dispersed, and the magnetically shielding lining material for bags has the structure described above. Conductive fibers with excellent removal properties are also uniformly dispersed, and copper or copper alloy ultrafine wires and conductive fibers penetrate into the polyurethane film layer during lamination.
Even if static electricity is generated due to friction on the surface of the polyurethane film, it is immediately removed.

Therefore, bags such as wallets, handbags, and briefcases made of this lining material can protect magnetic cards and IC cards stored therein from the effects of magnetism and static electricity. In addition, this lining material has the same appearance as conventional lining materials, such as color tone, and can be handled in exactly the same way as conventional lining materials in terms of manufacturing, such as sewing, so it has the magnetic shielding effect described above without compromising fashionability at all. , anti-static or elimination function can be obtained.

Claims (1)

[Claims] Copper or copper alloy ultrafine wire; 60 to 80 wt%, conductive fiber; 2 to 10 wt%; heat-fusible fiber; 10 to 38 wt% are mixed and formed, and this is thermocompressed to form a flexible sheet material, and a polyurethane film is added. A magnetically shielding lining material for bags, characterized by being laminated with.