JP2012194750A - Finger sack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finger sack sensed by an electrostatic capacitive touch panel, which has excellent sliding properties to the touch panel surface, has its own rich durability, causes no damage to the touch panel surface, and is convenient to carry.SOLUTION: Provided is a finger sack containing not less than 50 mass% of a fiber of which fiber surface is not covered with a conductive layer and of which specific resistance value is not more than 10000 Ω cm. Also, provided is a finger sack in which the fiber is a core-sheath type conjugate fiber containing carbon black in a core part.

Description

  The present invention relates to a finger sack that is also sensed by a capacitive touch panel.

  Capacitive touch panel can display clear images, has quick response, few malfunctions, is hard to damage the screen, and has high water resistance, such as ticket vending machines and bank terminals, recently smart phones, etc. Use for mobile terminals is also increasing.

  Since the capacitive touch panel performs input with a fingertip, fingerprints adhere to the screen due to sebum, and there is a problem that it is not hygienic to the eye.

  For example, Patent Document 1 proposes a stylus pen with a conductive tip, but the operation with the stylus pen is less comfortable than the fingertip operation, and the stylus pen itself needs to be always carried around. was there.

  Patent Document 2 also proposes a glove-type fiber structure using conductive fibers, but it is cumbersome to attach and detach, and is large and bulky to carry when not in use. there were.

  Further, Patent Document 3 describes a finger sack for static elimination that is woven with carbon fiber containing metal powder. However, since it is structurally unlikely to be in surface contact with the touch panel, the operability of the capacitive touch panel is described. However, since metal powder is used, the screen may be damaged if rubbed strongly.

  Patent Document 4 discloses an antistatic finger sack made of a rubber kneaded with conductive particles. However, the finger sack using rubber does not slide well on the touch panel surface. It was.

  Furthermore, Patent Document 5 also mentions a method of using coated conductive fibers on the surface of the finger sack, but the coated conductive fibers are peeled off, resulting in poor durability or scratching the touch panel surface. There was a problem that occurred.

Japanese Patent Laid-Open No. 10-187329 Utility Model No. 3160211 JP-A-9-306688 Japanese Utility Model Publication No. 4-56706 JP-A-11-135292

  The present invention provides a finger sack that has good sliding with respect to the touch panel surface, has high durability, does not cause scratches on the touch panel surface, and is inconvenient to carry.

  The gist of the present invention is a finger sack containing 50% by mass or more of a fiber whose surface is not coated with a conductive layer and having a specific resistance value of 10,000 Ωcm or less.

  The present invention provides a finger sack that has good sliding with respect to the touch panel surface, has high durability, does not cause scratches on the touch panel surface, and is inconvenient to carry.

An example of the finger sack of this invention. An example of the finger sack of this invention.

The present invention will be described in detail below.
(Fiber whose surface is not coated with a conductive layer)
The fiber that is not coated with the conductive layer on the surface of the fiber used in the finger sack of the present invention needs to have a specific resistance of 10000 Ωcm or less, and if the specific resistance is 10000 Ωcm or less, conductivity as high as the fingertip can be obtained. Sensitivity to the capacitive touch panel is improved.

  Nylon, polyester, acrylic, etc. are mentioned as the material of the fiber that does not cover the conductive layer on the fiber surface used in the finger sack of the present invention, but organic synthetic fiber that does not easily damage the touch panel surface is preferable.

  The fiber whose surface is not coated with a conductive layer that can be suitably used for the finger sack of the present invention is more preferably a core-sheath type composite fiber. Representative of core and sheath components of core-sheath type composite fibers such as zirconium carbide, metal carbides such as titanium carbide and hafnium carbide, iron, copper, aluminum, lead, tin, gold, silver, nickel, etc. Metals and their oxides, sulfides, carbonyl salts, indium tin oxide, antimony tin oxide, zinc oxide conductive metal oxides and their barium sulfate, titanium oxide, potassium titanate, aluminum It is preferable that non-metallic fine particles coated on the carrier fine particles or conductive materials such as furnace black, channel black, thermal black, and carbon black of acetylene black are included. It is preferable to use carbon black whose manufacturing technology is industrially established.

  The method of adding carbon black is to add a uniform color to the entire fiber. The resulting fabric will have a black-to-gray color due to carbon black in the entire fabric. It becomes difficult. In order to improve the dyeing performance, it is preferable to add carbon black in such an amount that a sufficient conductive performance can be obtained while being localized in the fiber.

  The concentration of carbon black in the core or sheath in the core-sheath composite fiber containing carbon black that can be suitably used for the finger sack of the present invention is preferably 30% by mass or more. If it is 30 mass% or more, it is preferable because sufficient conductive performance can be obtained, and it is preferable because the hue is not limited when the fabric is dyed later. Further, from the viewpoint of spinning stability at the fiber production stage, a range of 60% by mass or less is particularly desirable.

  About the fiber containing carbon black which can be suitably used for the finger sack of the present invention, a synthetic fiber produced by general melt spinning such as a polyester fiber, a nylon fiber or a polypropylene fiber, an acrylic fiber or a vinylon fiber, etc. General synthetic fibers such as synthetic fibers produced by wet spinning can be mentioned, but in the wet spinning method, even when the carbon black concentration in the core or sheath is increased to 30% by mass or more, it is industrial. In addition, it is possible to produce fibers. Furthermore, acrylic fibers are particularly preferable from the viewpoints of heat resistance and weather resistance. The form of the acrylic fiber is not particularly limited, and may be a long fiber or a short fiber.

  About the site | part containing carbon black, what is necessary is just the core part or sheath part of a core-sheath composite fiber, and a core-sheath composite fiber may have any fiber cross-sectional shape, Addition to the core part of the core-sheath composite cross section with no exposure or low exposure is less wear off such as dropouts and guides, and it is slippery against the touch panel surface, has excellent durability, and scratches on the touch panel surface Is preferable.

  The proportion of the carbon black-containing fibers in the entire fabric must be set in a range where sufficient conductive performance can be obtained and can be arbitrarily dyed with a dark color system. Sufficient conductive performance means that the specific resistance value is 10,000 Ωcm or less. In addition, it is possible to mix non-conductive fibers with conductive fibers, but in order to prevent malfunctions, capacitive touch panels are often programmed not to detect by point contact but by surface contact. The mixing ratio of the conductive fibers should be high, and it should be 50% by mass or more, preferably 80% by mass or more, and more preferably 100% by mass.

  The mixing method of the conductive fiber and the non-conductive fiber is not particularly defined, but in order to sense by surface contact, uniform mixing is preferable, that is, blended yarn in the case of spun yarn, and blended yarn in the case of filament.

  The non-conductive fiber is also preferably made of a material that does not easily damage the touch panel surface like the conductive fiber, such as organic synthetic fibers such as polyester, nylon, acrylic, and polypropylene, semi-synthetic fibers such as rayon and cupra, wool, and cotton. Natural organic fibers are preferred.

(Finger sack)
The finger sack of the present invention may have any structure such as a non-woven fabric, a woven fabric, and a knit as long as the conditions described later are satisfied, and may be antistatic flock (flocky) or synthetic leather. It is also possible to coat with acrylic resin, urethane resin or the like. However, if it is too hard, there is a risk of scratching the touch panel surface.

  The resistance value in the thickness direction of the finger sack of the present invention needs to be in the range of 0 to 10 MΩ, and in this range, the capacitive touch panel can be satisfactorily sensed.

  The finger sac of the present invention preferably uses conductive fibers for the fingertip and finger pad portion of the finger sack. In order to prevent malfunction, the capacitive touch panel does not react unless there is a certain contact area with a conductive part. Therefore, a part containing a large amount of conductive fiber is at least larger than a circle with a radius of 10 mm or more. It is preferable to include. As long as this requirement is satisfied, the belt-like shape as shown in FIG. 2, or the entire tip portion, or the entire finger sack may be a portion containing a large amount of conductive fibers.

  In the case of a multi-point detection type (multi-touch screen), an operation with the thumb at the same time as the index finger may be required, so by linking two finger sac-like fiber structures as shown in FIG. Only one of them can be prevented from being lost.

(Measurement of specific resistance)
The conductive acrylic fibers were accurately separated by 1 cm and adhered to the metal terminals with silver paste (Dotite manufactured by Fujikura Kasei Co., Ltd.). A DC voltage of 1000 V was applied between the metal terminals in an atmosphere at a temperature of 20 ° C. and a relative humidity of 40 RH%, and the resistance value between the metal terminals was measured (SM-8210 manufactured by Toa Denpa Inc.).

(Resistance value in the thickness direction)
Using conductive fiber or non-conductive fiber, a spun yarn was made with a count of 1/34 Nm and a twist number of 610 t / m Z, and an 18-gauge tubular knitted fabric was knitted. This knitted fabric is sandwiched between two copper plates (size: 2 cm × 5 cm, thickness: 0.5 mm), and a digital multimeter (manufactured by Sanwa Denki Keiki Co., Ltd., product name: P11) is used in the thickness direction. The resistance value was measured.

(Startup test)
Using conductive fiber or non-conductive fiber, a spun yarn was made with a count of 1/34 Nm and a twist number of 610 t / m Z, and an 18-gauge tubular knitted fabric was knitted. From this knitted fabric, a sample cut into a circle having a diameter of 15 mm was prepared. Further, the sample was attached using an adhesive so as to block a hole in a cut portion of a pure cotton work gloves (5-gauge, 7-gauge), which was previously cut into a circular shape having a diameter of 10 mm on the index finger of the work gloves. . Furthermore, only the fingertip part was cut out and used as a test sample. The test sample was fitted into the tester's right index finger, and it was confirmed whether or not the slide switch on the startup screen of the smartphone (Apple 3G 8MB manufactured by Apple Inc.) moved. It was determined that the slide switch moved to the right side and the smartphone was activated.

Hereinafter, the present invention will be described with reference to examples.
(Conductive fiber 1)
Carbon black (manufactured by Mitsubishi Chemical Co., Ltd., product name: Furnace Black MA100B) is added to the core at a concentration of 32% by mass with respect to the mass of the core, and a fineness of 3.3 dtex with a core-sheath mass ratio of 15 to 85 An acrylic core-sheath type composite fiber was obtained. What was cut into a length of 38 mm was used as the conductive fiber 1. The specific resistance value was 425 Ωcm.

(Conductive fiber 2)
An acrylonitrile copolymer (molecular weight 160,000) composed of 93.5 parts of acrylonitrile, 6.0 parts of methyl acrylate and 0.5 part of sodium methallyl sulfonate was dissolved in dimethylformamide so that the polymer concentration was 30%. A spinning dope A was prepared. 90 parts by mass of granular conductive titanium oxide (product name: ET-500W, manufactured by Ishihara Sangyo Co., Ltd.) having a particle size of 0.2 to 0.3 μm and a conductivity of 0.4 S / cm is the same as the above spinning stock solution A. A spinning dope B was prepared by dispersing in 100 parts of a spinning dope made of a copolymer.

The spinning stock solutions A and B thus obtained are each heated to 130 ° C., and then a core-sheath spinneret having 400 holes and a diameter of 0.2 mm so that the spinning stock solution B serves as a core and the spinning stock solution A serves as a sheath. Was discharged into an inert gas at 230 ° C. The obtained undrawn yarn was subsequently drawn 3.75 times in hot water at 100 ° C. and further washed with hot water at 95 ° C. The obtained fiber bundle was dried and relaxed at a relative humidity of 40% and a temperature of 150 ° C. in a non-tensioned state, and contracted by 20%.
This fiber had a fineness of 3 dtex, a core-sheath ratio: 75/25, and a content of conductive material in the core part of 43% by volume. What was cut into a length of 38 mm was used as the conductive fiber 2. The specific resistance value was 17800 Ωcm.

(Non-conductive fiber)
As non-conductive fibers, acrylic fiber staples (trade name: Bonnell, product number: H815BRE1.7T38 manufactured by Mitsubishi Rayon Co., Ltd.) having a single fiber fineness of 1.7 dtex and a length of 38 mm were used. The specific resistance value was 1000000 Ωcm or more.

  Using the above-mentioned fibers, a spun yarn was made with a count of 1/34 Nm and a twist number of 610 t / m Z in the combinations shown in Table 1, and an 18 gauge cylinder knitted fabric was knitted.

1 finger sack 2 part containing a lot of conductive fibers 3 part containing a lot of non-conductive fibers

Claims (4)

  A finger sack comprising 50% by mass or more of a fiber whose surface is not coated with a conductive layer and has a specific resistance of 10,000 Ωcm or less.   The finger sack according to claim 1, wherein a resistance value in a thickness direction is 0 to 10 MΩ.   The finger sack according to claim 1 or 2, wherein the fiber whose surface is not coated with a conductive layer is a core-sheath type composite fiber containing carbon black in the core.   The finger sac according to any one of claims 1 to 3, wherein a plurality of finger sac are connected.