JP2016123549A - Liquid detection cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid detection cloth that is convenient and also is reduced in cost.SOLUTION: A liquid detection cloth (1) is formed by disposing conductive threads A(3a-3m) and B(4a, 4b) in a textile (2) structure. The conductive threads A(3a-3m) are arranged in a parallel shape at predetermined intervals in a portion of threads (3, 4) constituting the textile (2). At least two conductive threads B(4a,4b) are arranged in the parallel shape at predetermined intervals in the direction perpendicular to the conductive threads A, and are electrically connected with the conductive threads A(3a-3m) arranged in the parallel shape alternately in every other. The threads other than the conductive threads A, B are electrically insulating threads. If a voltage is applied to at least two conductive threads (4a, 4b), the conductive threads (3a-3m) arranged in the parallel shape are short-circuited when a detection cloth gets wet by liquid (6), and the liquid can be detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid detection cloth woven with conductive yarn. More specifically, the present invention relates to a liquid detection cloth that is detected by short-circuiting when body fluid or injection liquid leaks and falls.

  Because a dialysis patient undergoes dialysis for a long time, it is necessary to lie down on the bed with the needle inserted into the arm. At this time, blood or body fluid may leak to the outside, and if it is not detected early, it may lead to a serious accident. The same applies to patients other than dialysis patients who must receive infusions of blood transfusion, drug solution, nutrient solution, etc. for a long time. In addition, when a drug solution or a nutrient solution leaks, there is a problem that an accurate injection amount into the human body becomes unclear, and in the case of a patient receiving an expensive drug, there is a problem that it costs a lot when the drug leaks. is there.

  In order to solve such a problem, Patent Document 1 proposes to use a water-permeable sheet sandwiched between a porous metal sheet and a metal sheet having no holes. Patent Document 2 proposes detecting blood leakage using an optical fiber. Patent Document 3 proposes the use of a circuit pattern made of aluminum foil. Patent Document 4 proposes detection by a liquid leakage sensor in which a circuit pattern is created on a synthetic resin film. Patent Document 5 proposes a detection sensor of a type wound around an arm.

JP 2007-143895 A Special table 2008-503318 JP 2005-331398 A JP 2005-253654 A Special table 2007-502148

  However, the conventional technology has a problem that it is not easy to use and a cost is high.

  In order to solve the above-described conventional problems, the present invention provides a liquid detection cloth that is easy to use and inexpensive.

  The liquid detection cloth according to the present invention is a liquid detection cloth in which conductive yarns A and B are arranged in a textile structure, and the conductive yarn A is spaced a predetermined distance from a part of the yarn constituting the textile structure. In the direction perpendicular to the conductive yarn A, at least two conductive yarns B are arranged in parallel at a predetermined interval, and one conductive yarn A and the parallel arranged conductive yarns A are arranged in parallel. They are electrically connected alternately, and the yarns other than the conductive yarns A and B are electrically insulating yarns.

  In the liquid detection cloth of the present invention, when a voltage is applied to the at least two conductive yarns B, when the detection cloth gets wet by the liquid, the conductive yarns A arranged in parallel are short-circuited, and the liquid is discharged. Can be detected. Since the conduction by the liquid is detected, accurate detection is possible, and it is easy to use and is preferable in terms of cost.

FIG. 1 is a plan view showing a liquid detection cloth according to an embodiment of the present invention. FIG. 2A is an explanatory diagram in which the warp conductive yarn and the weft conductive yarn are electrically connected. FIG. 2B is an electrical disconnection by disposing an electrically insulating yarn between the warp conductive yarn and the weft conductive yarn. It is explanatory drawing which is in a state. FIG. 3A is a side view of a covering yarn used in one embodiment of the present invention, and FIG. 3B is a side view of another embodiment.

  The liquid detection cloth of the present invention is a detection cloth in which the conductive yarns A and B are arranged in the structure of a woven fabric, a knitted fabric or a non-woven fabric in the manufacturing process. In general, textile structures such as woven fabrics, knitted fabrics or non-woven fabrics are water-absorbing and easily absorb liquids. This property is used to make a liquid detection cloth. The liquid may be any liquid such as blood, urine and other human body fluids, dialysate, drug solution, nutrient solution.

  The conductive yarns A and B constituting the liquid detection cloth may be the conductive wires as they are, or may be covered with an electrically insulating yarn material as long as the liquid reaches the conductive wires. For example, it may be a yarn covered with an electrically insulating yarn so that the conductive wires A and B to which voltage is applied do not directly touch the skin, and the covering may be a single covering yarn or a double cover. Although a ring yarn may be used, a double cover ring yarn is preferred for a firm cover ring. Preferably, one of the conductive yarns A and B is a yarn in which the surface of the electrically insulating yarn is covered with a metal fiber, and the other is a plurality of metal fibers that are drawn, twisted, or braided.

  In the textile of the present invention, the conductive yarn A is arranged in parallel at a predetermined interval on a part of the yarn in one direction. A preferable space | interval is 2-30 mm, More preferably, it is 3-25 mm, More preferably, it is 4-20 mm. If the interval is too narrow, a short circuit is likely to occur and malfunction is likely to occur. If the interval is too large, the amount of liquid leakage required for detection increases. It is preferable to determine the interval by considering these problems. The preferred number of conductive yarns A arranged in parallel is about 2 to 100.

  At least two conductive yarns B are arranged in parallel to each other in a direction perpendicular to the conductive yarns A arranged in parallel, and the at least two conductive yarns B are arranged in parallel. The conductive yarns A are alternately electrically connected every other. For electrical connection, there are a method of electrical connection by physical contact with a textile structure such as woven or knitted fabric, a method of sewing or embroidery, a method of electrical connection with solder, conductive paste, conductive adhesive, etc. However, any method that can maintain electrical connection as the liquid detection cloth may be used.

  The method of electrical connection by physical contact with a textile structure such as woven or knitted fabric makes it easy to maintain electrical connection even when the textile is stretched or deformed, such as bending. Does not spoil the characteristics.

  In the case of fixing with solder or the like, the soldering is performed by moving the electrically insulating yarn and bringing the conductive yarns A and B into contact with each other. Warps and wefts other than the conductive yarns A and B are electrically insulating yarns.

  The at least two conductive yarns B are used as an electrode extraction part.

  The conductive yarns A may be arranged either in the form of warp or weft in the case of a woven fabric. When the conductive yarns A are arranged in parallel in the warp, the weft yarn has at least two conductive yarns B with a predetermined interval. Arranged in parallel. In the case of a knitted fabric, it is similarly arranged in the wale direction and the course direction.

  In the liquid detection cloth of the present invention, a voltage is applied to at least two conductive yarns B, and when the detection cloth is wetted by the liquid, a short circuit between the conductive yarns A arranged in parallel is detected. Thereby, the leaking liquid is detected. The voltage is preferably a low voltage that does not affect the human body.

  The conductive yarns A and B need only have an electrical resistance that can measure a change in the applied voltage. However, if the electrical resistance is high, heat generation may occur. is there.

  The types of conductive yarns A and B to be used include metal fibers such as copper, stainless steel and tin-plated copper, carbon fibers, metal insulation such as polyester and nylon, metal plating such as silver, copper and copper nickel, and metal deposition. , A yarn having a structure in which an electrically insulating yarn and a metal fiber are combined by spinning, twisting (synthetic twisting), covering, braid, or the like.

  Further, a tape-like thread of a metal foil such as copper or aluminum may be used as long as the width is 5 mm or less, preferably 2 mm or less. When the width of the tape shape is 5 mm or more, processing with a general-purpose textile production facility becomes difficult, which is not preferable.

  The conductive wire is preferably a metal filament. If it is a metal filament, poor conduction will not easily occur. As an example of the metal filament, tin plating is applied to a copper wire. This can prevent rust. The diameter of the single wire of the conductive wire is preferably 20 to 100 μm, and 2 to 20 single wires are aligned, twisted or braided for use. In the case of braids, the number of about 3 to 16 is preferable.

  Electrical insulating yarns include polyester fibers such as polyethylene terephthalate (PET), polyamide fibers such as 6,6-nylon, polyolefin fibers such as polypropylene, acrylic fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, aramid fibers, and vinylon. Fiber, polylactic acid fiber, polyphenylene sulfide (PPS) fiber, polyarylate fiber, polybenzoxazole (PBO) fiber, polyketone fiber, polyimide fiber, polyamideimide fiber, wool fiber, cotton fiber, hemp fiber, cellulose fiber, etc. Can be used. Polyester fiber or polyamide fiber yarn is preferred from the viewpoint of strength and cost. The yarn may be a spun yarn or a filament yarn. In the case of filament yarn, it may be raw yarn, processed yarn such as woolly, or monofilament. Moreover, the above-mentioned single thread | yarn may be sufficient and the thread | yarn which combined 2 or more types of electrically insulating thread | yarn may be sufficient. The fineness of the electric insulating yarn is preferably 50 to 400 dtex, more preferably 100 to 300 dtex.

  Among the electrical insulating yarns constituting the textile, the electrical insulating yarns arranged in the same direction as the conductive yarns B have higher water absorption than the electric insulating yarns arranged in the same direction as the conductive yarns A arranged in parallel. It is preferred to use yarn. By adding anisotropy to the water absorption characteristics in this way, when the liquid detection cloth of the present invention is wetted by the liquid, it becomes easy to detect by promoting a short circuit between the conductive yarns A arranged in parallel. As a method for improving the water absorption speed of the electric insulating yarn arranged in the same direction as the conductive yarn B, there are a method using a high count yarn having a small yarn diameter, a method using a modified cross-section yarn or a microporous yarn, and the like. On the other hand, as a method for reducing the water absorption speed of the electrically insulating yarn arranged in the same direction as the conductive yarn A, there is a method of using a monofilament yarn, a twisted yarn, and / or a resin processed yarn.

  The fabric structure constituting the liquid detection cloth of the present invention may be any structure such as plain weave, twill, satin weave, and other changed weaves. Preferably, the region where the conductive yarn is woven is made into a double structure. The double structure of the conductive yarn portion may be a warp double structure, a weft double structure, or a warp double structure. The same applies to the case of a knitting structure, and it is preferable that the region where the conductive yarn is woven be a double structure regardless of warp knitting, weft knitting, or circular knitting. By using a double structure, the conductive yarn can be protected and direct contact with the outside can be blocked.

The weight (weight per unit area) of the liquid detection cloth is preferably 100 to 400 g / m ² , more preferably 150 to 300 g / m ² .
The thickness of the liquid detection cloth is preferably 0.2 to 2 mm, more preferably 1 mm or less.

  By coating or laminating one surface of the liquid detection cloth with resin, the liquid dropped from the other side can be held in the liquid detection cloth and the detection speed can be increased. This method also has an effect of preventing the liquid dropped on the liquid detection cloth from flowing out. The weight (weight per unit area) and thickness after resin processing increase by the amount of resin attached.

  The warp is preferably a conductive yarn made of a braided metal filament, and the weft is preferably a conductive yarn covered by an electrical insulating yarn. Alternatively, it is preferable to use two or more conductive yarns in parallel. If it does in this way, it will be easy to take the electrical connection of a warp and a weft.

  Hereinafter, it demonstrates using drawing. FIG. 1 is a plan view showing a liquid detection cloth according to an embodiment of the present invention. In the liquid detection cloth 1, a base cloth 2 is composed of wefts 3 and warps 4. The weft 3 and the warp 4 constituting the base fabric 2 are electrically insulating threads. As part of the weft 3, weft conductive yarns 3a to 3m are arranged in parallel at a predetermined interval. In a part of the warp yarn 4, at least two warp conductive yarns 4a and 4b are arranged in parallel at a predetermined interval in a direction perpendicular to the parallel conductive yarns 3a to 3m. The at least two warp conductive yarns 4a and 4b are alternately electrically connected to the weft conductive yarns 3a to 3m alternately.

  As this electrical connection method, there is a method of electrical connection by physical contact with a textile structure such as woven or knitted, a method of electrical connection with solder, conductive paste, conductive adhesive, etc. Any method that can maintain electrical connection as the liquid detection cloth may be used.

  When a textile structure is used as an example of the textile structure, a multi-layer structure of the textile is used, and the warp conductive yarn 4a is connected to the weft conductive yarns 3a, c, e, g, i, The k, m and contacts 5a-5g, and the warp conductive yarn 4b is physically and electrically connected to the weft conductive yarns 3b, d, f, h, j, l and contacts 5h-5m. Further, the warp conductive yarn 4b and the weft conductive yarns 3a, c, e, g, i, k, m, and the warp conductive yarn 4a and the weft conductive yarns 3b, d, f, h, j, l are shown in FIG. 2B. As described above, the electrically insulating yarn 20 is physically and electrically disconnected by being disposed between the two.

  When solder or conductive adhesive is used, the warp conductive yarn 4a is fixed by solder at the contact points 5a to 5g with the weft conductive yarn, and the warp conductive yarn 4b is soldered at the contact points 5h to 5m of the weft conductive yarn. It is fixed by. The other contacts are electrically isolated. The electrode take-out portions 4c and 4d for the transconductive yarn are not essential, but they are convenient in that they can be used regardless of the vertical relationship of the liquid detection cloth 1.

  A low voltage that is not felt by the human body is applied to the transconductive yarns 4a and 4b. When the liquid 6 falls on the liquid detection cloth 1 in this state, any one of the weft conductive yarns 3a to 3m conducts and causes a short circuit. As a result, low-current electricity flows and the liquid 6 can be detected. After the liquid is detected, the monitor can be notified by various methods such as alarm and lamp.

  FIG. 3A is an explanatory side view of the single covering yarn 7 used in one embodiment of the present invention. That is, the conductive yarn 9 is covered in one direction around the electrical insulating yarn 8. FIG. 3B is an explanatory side view of the double covering yarn 10 of another embodiment. The conductive yarns 11 and 12 are covered around the electric insulating yarn 8 from both directions.

  The liquid detection cloth of the present invention is suitable for medical use. For example, it is placed under the arm or injection part of a patient who receives dialysate, blood transfusion, drug solution, nutrient solution, etc., and detects human fluid such as blood, urine, fluid such as dialysate, drug solution, nutrient solution, etc. It is suitable for doing. In addition, it is also suitable as a cloth for detecting liquid.

  Hereinafter, more specific description will be made using examples. In addition, this invention is not limited to the following Example.

Example 1
<Warning>
Polyester (PET) multifilament yarn (fineness: 167 dtex, 48 filaments, Z twist: 800 t / m) was used as the warp. The conductive yarn used was a braided string using eight tin-plated copper wires and a diameter of 60 μm and an aramid spun yarn (50/1) inserted into the core.
<Weft>
As the weft, 48 polyester (PET) multifilament wooly processed yarns having a total fineness of 167 dtex, 48 yarns were used. The conductive yarn used was a polyester yarn used as a warp as a core yarn, and two tin-plated copper wires (diameter 60 μm) as sheath yarns and double-covered at 3,500 t / m in the s · z direction.
<Textile>
The weaving structure has a basic structure of 2/2 twill, a warp density of 110 / 25.4 mm, a weft density of 70 / 25.4 mm, a weight per unit area (weight per unit area) of 188 g / m ² , and a basic thickness The tissue part averaged 0.32 mm, and the conductive yarn crossing part averaged 0.54 mm. The weft conductive yarn portion has a weft double structure, and as shown in FIGS. 2A-B, the contact / non-contact of the warp and weft conductive yarn was controlled by the woven structure. Two conductive yarns in the weft direction were woven in parallel at 58 locations, each in a 240 mm interval. Two conductive yarns in the warp direction were woven in parallel with an interval of 10 mm. Thus, the liquid detection cloth shown in FIG. 1 was manufactured.
<Liquid detection cloth>
A 1.5V button battery was connected to the transconductive yarns 4a and 4b (electrode extraction part) of the liquid detection cloth shown in FIG. In this state, when the liquid 6 was dropped from the dropper onto the liquid detection cloth 1, the weft conductive yarns 3f to 3i were electrically connected to cause a short circuit. As a result, low-current electricity flowed and liquid could be detected.

  The liquid detection cloth of the present invention is laid under the arm or liquid injection part of a patient receiving dialysate, blood transfusion, drug solution, nutrient solution, etc., and human body fluid such as blood, urine, dialysate, drug solution, nutrition It is suitable for detecting a liquid such as a chemical solution.

1 Liquid detection cloth 2 Base cloth (textile)
3 Weft 3a-3m Weft Conductive Yarn 4 Warp Yarn 4a-4d Warp Conductive Yarn 5a-5g Contact 6 Liquid 7 Single Covering Yarn 8 Electrical Insulating Yarn 9, 11, 12 Conductive Yarn 10 Double Covering Yarn 20 Electrical Insulating Yarn

Claims (8)

A liquid detection cloth in which conductive yarns A and B are arranged in a textile structure,
The conductive yarn A is arranged in parallel at a predetermined interval in a part of the yarn constituting the textile structure,
In a direction orthogonal to the conductive yarn A, at least two conductive yarns B are arranged in parallel with a predetermined interval, and alternately with the conductive yarns A arranged in parallel. Connected,
A liquid sensing cloth, wherein the yarn other than the conductive yarns A and B is an electrically insulating yarn.   A voltage is applied to the at least two conductive yarns B, and when the liquid detection cloth gets wet, a short circuit between the conductive yarns A arranged in parallel can be detected. Liquid detection cloth as described.   3. The liquid detection cloth according to claim 1, wherein at least one of the conductive yarns AB is a yarn in which a surface of an electrically insulating yarn is covered with a metal fiber.   The liquid detection cloth according to any one of claims 1 to 3, wherein at least one of the conductive yarns AB is formed by aligning, twisting, or braiding a plurality of metal fibers. Liquid detection fabric according to claim 1 the weight of the textile in the range of 100g~250g / m ^2.   The liquid detection cloth according to any one of claims 1 to 5, wherein the conductive yarn B is electrically connected alternately to the conductive yarn B every other line by a woven structure.   The liquid detection according to any one of claims 1 to 6, wherein the water absorption speed of the electrically insulating yarn arranged in the same direction as the conductive yarn A is slower than the water absorption speed of the electrically insulating yarn in the same direction as the conductive yarn B. cloth.   The liquid detection cloth according to claim 1, wherein the liquid detection cloth is a medical liquid detection cloth.

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