JP2012197521A - Conductive stretchable knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive stretchable knitted fabric that has a small variation in electrical resistance even when the fabric is deformed and extended while being flexible and having a high stretchability, has a property of keeping an excellent conductivity, and is usable not only for clothing products but also for wiring and sensor applications.SOLUTION: There is provided a knitted fabric including a conductive yarn and a non-conductive yarn in which the ratio of the number of stitches formed with the conductive yarn is 70% or less based on the number of total stitches forming the knitted fabric. The knitted fabric has continuity in a face direction. Preferably, the conductive yarn intermittently forms stitches.

Description

  The present invention relates to a conductive elastic knitted fabric having flexibility unique to a knitted fabric and capable of maintaining stable conductivity even when deformed or stretched.

In recent years, wearable computers and ubiquitous computing have been attracting attention, and there is a concept of making conductive textile products such as clothing and using them as various electronic devices.
However, at present, a material having a small change rate of the electric resistance value at the time of deformation and expansion / contraction with respect to the elastic fiber material has not been put into practical use.

Various methods have been devised for imparting electrical conductivity to the fiber material. As a method for imparting electrical conductivity without impairing flexibility, which is a characteristic of the fiber, the fiber material can be made by plating, metal vapor deposition, sputtering, etc. The method of forming a metal thin film on the surface is mentioned.
By the way, the fiber material imparted with conductivity by such a method may cause an increase in electric resistance value or, in the worst case, loss of conductivity due to cracking or peeling of the metal film due to deformation. Inevitable. Furthermore, the stretchable fiber material has a drawback in that the electrical resistance value changes greatly due to deformation and stretch.

Patent Document 1 below discloses a conductive fiber sheet obtained by conducting a conductive process on a high elongation cloth mainly composed of highly crimped fibers by electroless plating, metal vapor deposition, sputtering, or application of a conductive paint. Even if this conductive fiber sheet is stretched, the crimp of the crimped fiber is stretched, so that the sheet can be stretched without causing cracks in the metal layer. It can have a stable shielding effect and formability as a shielding material for a molded product.
However, the application range of such a conductive fiber sheet is limited due to lack of flexibility and elongation.

Further, in the following Patent Document 2, all the composite yarns in which stretchable yarns are covered with a synthetic fiber made conductive by any one of plating, metal vapor deposition, sputtering, and conductive paint, Alternatively, a knitted fabric knitted using a part thereof is disclosed.
However, in the stretchable conductive fabric of Patent Document 2, the stitch loops formed by the composite yarn are in contact with each other in the knitted fabric, and when the fabric is deformed / stretched, the stitch loops become non-contact and there is a large change in the electrical resistance value. Even if the fabric is deformed or stretched, the requirement cannot be satisfied in an application where a stable electric resistance value equivalent to that when the fabric is not deformed or stretched is required.

Japanese Patent No. 2908543 JP 2007-191811 A

  The problem to be solved by the present invention is to provide a stretchable knitted fabric that has a small change in electrical resistance and retains excellent conductivity even when the fabric is deformed / stretched while having flexibility and high stretchability. is there.

  As a result of intensive studies and repeated experiments to solve the above problems, the present inventors have determined that the number of stitches formed by the conductive yarn in the stretch knitted fabric is 70% or less of the total number of stitches. In order to complete the present invention, it is unexpectedly found that the rate of change of the electrical resistance value when the knitted fabric is stretched by 50% is 20% or less in the vertical and horizontal directions of the knitted fabric. It came.

That is, the present invention is as follows.
[1] A conductive stretch knitted fabric characterized in that the ratio of the number of stitches formed by the conductive yarn to the total number of stitches constituting the knitted fabric is 70% or less and is conductive in the surface direction.

  [2] The conductive elastic knitted fabric according to [1], wherein the ratio of the number of stitches formed by the conductive yarn to the total number of stitches constituting the knitted fabric is 35% or less.

  [3] The conductive elastic knitted fabric according to [1] or [2], wherein the conductive yarn intermittently forms stitches.

  [4] The change rate of the electrical resistance value when the knitted fabric is stretched by 50% is 20% or less in the vertical and horizontal directions of the knitted fabric, according to any one of the above [1] to [3]. Conductive stretch knitted fabric.

  The stretch knitted fabric of the present invention has high flexibility and conductivity, and has an effect of maintaining stable conductivity even when deformed or stretched.

Knitting organization chart of Example 1 Knitting organization chart of Example 2 Knitting organization chart of Example 3 Knitting organization chart of Example 4 Knitting organization chart of Example 5 Knitting organization chart of Example 6 Knitting organization chart of comparative example 1 Knitting organization chart of comparative example 2 Knitting organization chart of comparative example 3

Hereinafter, the present invention will be described in detail.
The conductive stretchable knitted fabric in the present invention comprises a conductive yarn and a non-conductive yarn.
The conductive yarn in the present invention is a yarn made of a conductor, and the non-conductive yarn is a yarn made of an insulator. Here, the conductor means a material having a specific resistance (also referred to as volume resistivity) of less than 10 ⁸ Ω · cm, and a material having a specific resistance of 10 ⁸ Ω · cm or more is called an insulator. Here, the “specific resistance” is a physical property value used for comparing what kind of material is difficult to conduct electricity, and can be measured, for example, according to “JIS K-7194”.

  In the present invention, the conductive yarn is not particularly limited, and a metal fiber such as copper or stainless steel, carbon fiber, a fiber formed of a conductive polymer, or a synthetic fiber is coated with a metal by a conventional method such as a sputtering method or a plating method. Conductive yarn coated on the fiber surface, conductive yarn coated with carbon nanotubes, conductive yarn with copper sulfide bonded to the fiber surface, conductive carbon black and metal powder in synthetic fibers, copper sulfide, zinc sulfide and other metal compounds And a thread kneaded with a conductive substance such as a conductive polymer. The synthetic fiber used here is not particularly limited. Synthetic fibers include polyester (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, etc.), polyamide (nylon 6, nylon 66, etc.), polyolefin (polyethylene, polypropylene, etc.), polyacrylonitrile, polyvinyl alcohol, etc. Is mentioned. As a fiber form, any of a filament and a staple may be sufficient, and a mixed fiber state may be sufficient. In addition, the cross-sectional shape of the fiber is not particularly limited, and may be round, polygonal, such as a triangle or quadrangle, or an irregular cross-sectional shape such as a flat shape, or may have a hollow portion. .

  Among these conductive yarns, a conductive yarn in which copper sulfide is bonded to the fiber surface is preferable because it has little change over time due to chemical change and is excellent in conductivity. The conductive yarn in which this copper sulfide is bonded to the acrylic fiber surface is preferable. (For example, “Sunderron” manufactured by Nippon Shaku Dyeing Co., Ltd.) is more preferable because a desired resistance value can be imparted by appropriately adjusting the binding amount of copper sulfide to the fiber.

The resistance value per 10 cm of the conductive yarn is preferably 10 ⁻¹ to 10 ⁷ Ω. Here, the “resistance value per 10 cm” is a resistance value between the conductive yarns 10 cm when a low voltage of about 5 V is applied, and is measured using a general-purpose tester (maximum resistance measurement value is about 60 MΩ). can do. Since the knitted fabric of the present invention is typically used as a wiring or a sensor, evaluation at a high voltage for the purpose of preventing charging is not appropriate. When the resistance value per 10 cm of the conductive yarn is larger than 10 ⁶ Ω, the knitted fabric has insufficient conductivity. The resistance value per 10 cm of the conductive yarn is more preferably 10 ⁻¹ to × 10 ⁶ Ω, and further preferably 10 ⁻¹ to × 10 ⁵ Ω.

  The fineness of the conductive yarn to be used is not particularly limited. When the fiber form is a filament, it is, for example, 22 to 5600 dtex, preferably 33 to 3300 dtex, and more preferably 56 to 1670 dtex. The number of filaments of the conductive yarn is not particularly limited, and from the viewpoint of the stability of the electric resistance value, it is preferable that the number of monofilaments or filaments is small. However, when flexibility is required for the stretch knitted fabric, the single yarn A multifilament having a fineness of 1 to 5 dtex is preferred. When the fiber form is staple, the fineness of the conductive yarn is 1/2 to 1/300, preferably 1/3 to 1/180, more preferably 1/6 to 1/120 in terms of the hair count.

  The non-conductive yarn used together with the conductive yarn in the present invention is not particularly limited, and any of natural fiber, synthetic fiber, semi-synthetic fiber, man-made fiber, inorganic fiber, and a combination of two or more of them can be used. May be. Moreover, it is preferable to use an elastic yarn in combination in order to give the knitted fabric excellent stretchability. The elastic yarn used in the present invention is preferably a yarn composed of elastic fibers that inherently have rubber-like elasticity. The elastic fibers include polyurethane elastic yarns, polyether / ester elastic yarns, polyamide elastic yarns, etc., so-called rubber yarns made of natural rubber, synthetic rubber, semi-synthetic rubber, and other organic synthetic resins mainly composed of these. And elastic yarns obtained by combining or mixing. In particular, polyurethane elastic yarn is preferable because it can exhibit excellent elastic characteristics even with fineness. The elastic yarn may be in the form of either a monofilament or a multifilament. The elastic yarn may be used as a raw yarn as it is, or may be used as a non-elastic yarn or a processed yarn covered with an elastic yarn.

  As the conductive elastic knitted fabric of the present invention, any of weft knitting, circular knitting and warp knitting can be used. Yarn usage, knitting structure, etc. can be selected appropriately according to the requirements of use, stretchability, thickness, basis weight, etc., but the conductive elastic knitted fabric of the present invention constitutes a ground structure with elasticity with non-conductive yarn However, the conductive yarn is knitted into the ground structure, and further needs to have conductivity in the surface direction of the fabric.

  In order to provide conductivity in the surface direction in the conductive stretchable knitted fabric of the present invention, adjacent conductive yarns need to be in contact with each other. For example, when a knitted fabric is formed with a circular knitted sheeting structure with only conductive yarns, all the conductive yarns are in contact with the adjacent conductive yarns, so there is conductivity in the surface direction. When knitted fabrics are simply arranged alternately and a knitted fabric is formed with a woven fabric, adjacent conductive yarns are not in contact with each other, so there is conductivity in one direction but no conductivity in the other direction End up. Therefore, in order to have conductivity in the surface direction, it is necessary to bring adjacent conductive yarns into contact with each other due to a change in the knitting structure such as tack or welt. In that case, it is preferable that the adjacent conductive yarns in the same stitch are in contact with each other, and when the loop is not formed by the insertion knitting or the like, the conductive yarns are not in contact with each other and the surface conductivity is lost. Therefore, it is more preferable that the conductive yarn forms a knit loop at the contact portion.

In the conductive stretch knitted fabric of the present invention, the rate of change in electrical resistance value when the knitted fabric is stretched by 50% is preferably 20% or less, more preferably 15% or less in both the vertical and horizontal directions. More preferably, it is 10% or less.
For example, in a knitted fabric knitted using a composite yarn in which a stretchable yarn disclosed in Patent Document 2 is covered with a conductive yarn, the stitch loops formed by the composite yarn in the knitted fabric are in contact with each other. When the fabric is deformed or stretched, the stitch loop becomes non-contact and a large change occurs in the electrical resistance value. Even when the fabric is deformed or stretched, a stable electrical resistance value equivalent to that when the fabric is not deformed or stretched is required. The application cannot satisfy that requirement.

In a knitted fabric using conductive yarns, the cause of the change in electrical resistance due to the expansion and contraction of the fabric is that when the knitted fabric is not stretched, the adjacent loops formed by the same conductive yarn in the knitted fabric come into contact with each other. This is because the electrical short circuit occurs, but when the fabric is stretched, the contact portion is separated and the electrical short circuit is eliminated.
From these things, in order to obtain a stable electrical resistance value equivalent to that at the time of non-stretching even when the knitted fabric is stretched, it is necessary to reduce the contact of the conductive yarn in the knitted fabric as much as possible. If the ratio of the number of stitches formed by the conductive yarn is 70% or less, preferably 35% or less, more preferably 30% or less, and even more preferably 15% or less of the total number of stitches constituting the knitted fabric, the above-described expansion and contraction is performed. It has been found that the rate of change of the electrical resistance value due to is less than 20% in both the vertical and horizontal directions.

  In the present invention, “the total number of stitches constituting the knitted fabric” refers to the number of stitches of one complete organization of the knitted fabric. The “number of stitches formed by the conductive yarn” means the number of stitches formed by the conductive yarn existing in the complete structure. In the knitted fabric, when the ratio of “the number of stitches formed by the conductive yarn” to “the total number of stitches constituting the knitted fabric” exceeds 70%, the same conductive yarn is formed in the knitted fabric when the fabric is not stretched. As a result, the number of adjacent loops increases, and as a result, the number of contact parts that dissociate when the fabric is stretched increases, the electrical resistance value increases, and the change rate of the electrical resistance value when stretched by 50% is 20%. It will exceed.

  In the present invention, in order to make the ratio of the number of stitches formed by the conductive yarn 70% or less of the total number of stitches constituting the knitted fabric, it is preferable to perform yarn removal or intermittent stitch knitting. In the case of round knitting and weft knitting, thread knitting refers to knitting non-conductive yarn by partially removing conductive yarn without continuing the course row of conductive yarn, and for warp knitting, supplying conductive yarn. This means that the conductive yarn is knitted in a state in which the conductive yarn is partially pulled out from all the guides. In warp knitting, the state in which all the guides of the heel are filled with yarn is called “all-in”. In the case of yarn knitting, for example, when every 15 yarns are put into the guide at a rate of “1 in / 15” "Out", when entering every other guide into the guide, it is expressed as "1 in / 7 out". Intermittent stitch knitting refers to incorporating a change structure such as tack or mistake into the conductive yarn knitting structure for round knitting or weft knitting, and inserting it before or after the stitches constituting the loop for warp knitting. By incorporating a knitting, the conductive yarn does not form a continuous stitch, but knitting with a reduced number of stitches. Intermittent stitch knitting can reduce contact between adjacent loops formed by the same conductive yarn. Particularly in warp knitting, it is preferable that the conductive yarns are knitted into a lattice pattern with a thread-drawn atlas structure in a ground structure made of non-conductive yarns, so that the contact of the stitches between the conductive yarns can be greatly reduced. More preferably, when the conductive yarn is knitted with an atlas structure, the knit loop and the insertion knitting are combined to form a knitted structure in which the knit loop formed of the same conductive yarn is not continuous. The loops hardly come into contact with each other, and the rate of change in electrical resistance when the fabric is stretched becomes extremely small.

  In the conductive stretch knitted fabric of the present invention, when the conductive yarn is knitted in a lattice pattern in the ground structure made of non-conductive yarn, examples of the lattice pattern include a rhombus lattice, a triangular lattice, a square lattice, a hexagonal lattice, and the like. The shape and size of the lattice pattern can be appropriately selected depending on the application. Here, the size of the lattice pattern means the height of a triangle if it is a triangular lattice, and the length of the longest diagonal line if it is a rhombus, square lattice, or hexagonal lattice. The size of the lattice pattern is preferably 2 to 30 mm, more preferably 2 to 20 mm, still more preferably 2 to 10 mm in order to improve the surface conductivity.

  In the present invention, in order to impart conductivity in the surface direction of the knitted fabric, as a method of bringing the conductive yarns adjacent in the vertical and horizontal directions into contact, the conductive yarns adjacent in the vertical and horizontal directions in knitting are at least partially the same. A method of forming a knit loop, a method of connecting a knit loop of another conductive yarn to a knit loop of one conductive yarn, a sinker loop of one conductive yarn and another conductive yarn, an insertion yarn, or a tack yarn Any method may be used, such as a method in which the contact yarns are in contact with each other or a method in which the insertion yarns of adjacent conductive yarns are partially overlapped and contacted. Among these, the method of forming the same knit loop with at least a portion of the conductive yarns adjacent to each other in the vertical or left and right directions is preferable in order to strengthen the contact of the conductive yarns, and further, the knit loop formed by at least one conductive yarn is provided. When formed with closed stitches, the contact between the conductive yarns in the same knit loop becomes stronger, and even when the fabric is stretched, the contact between the conductive yarns hardly occurs and the change in the electrical resistance value becomes small. Is more preferable.

  In the conductive stretch knitted fabric of the present invention, the conductive yarn may be exposed on the surface of the knitted fabric or may be covered with a non-conductive yarn, but depending on the application, a connection terminal for performing electrical wiring Is necessary on the surface of the knitted fabric, or when used as an electrode or the like, it is preferable that the conductive yarn is exposed on the surface of the knitted fabric. On the other hand, when the conductive stretch knitted fabric of the present invention is used as a circuit board or the like, it is preferable to suppress the surface exposure of the conductive yarn in order to prevent a short circuit of the circuit.

  In warp knitting, in order to expose the conductive yarn on both front and back sides, it is preferable to supply the conductive yarn by placing it on the front side of the knitting machine, in order to suppress exposure of one side of the front and back side of the conductive yarn, It is preferable to supply the conductive yarn by placing it on a bag on the back side of the knitting machine.

  The knitted fabric density of the conductive stretch knitted fabric of the present invention can be appropriately selected depending on the requirements such as use, stretchability, thickness, basis weight and the like. In the present invention, the knitted fabric density is the density of the knitted fabric after dyeing finish, and it is necessary to design the knitted fabric in consideration of shrinkage of the knitted fabric at the time of knitting. This knitted fabric density is the number of loops per 2.54 cm. If the knitted fabric density ratio (the number of courses / the number of wales) is less than 1.55, curling is likely to occur at the left and right ends of the two-way warp knitted fabric, and the knitted fabric density ratio is greater than 2.35. As a result, the curl phenomenon tends to occur at the upper and lower knitted fabric ends in the warp direction of the two-way warp knitted fabric. The knitted fabric density ratio is preferably 1.65 to 2.25. The design of the knitted fabric relating to the knitted fabric density ratio in the present invention is basically possible even if the gauge of the knitting machine is changed. For example, in the case of 28 gauge, the most preferable knitted fabric density ratio is 1.56 to 1. In the case of a 36 gauge knitting machine, the most preferable range of the knitted fabric density ratio tends to be higher as the gauge is finer, such as the most preferable knitted fabric density ratio is 1.85 to 2.35. The method of designing the knitted fabric so that the knitted fabric density ratio of the two-way warp knitted fabric is 1.55 to 2.35 is, for example, the elastic runner length (also called run-in) during knitting to form one stitch An index that indicates the length of the yarn to be used. The larger the number in the same structure, the coarser the stitches. In the warp knitting field, the yarn length per 480 course is expressed by knitting nylon fibers or polyethylene terephthalate fibers and elastic fibers. The knitted fabric is knitted with a larger number of on-machine courses (indicating the height of one stitch at the time of knitting and representing higher density as the number of courses as the knitted fabric winding amount is larger) than in the knitted fabric. There is a need to.

  The conductive stretch knitted fabric of the present invention has stretch properties, and fit properties can be obtained by this property. The stretch direction of the stretchable knitted fabric may be either the warp direction or the horizontal direction, but the fit is further improved by using two directions. The stretch rate of the stretchable knitted fabric is preferably adjusted to an optimal stretch rate depending on the purpose of use. The elongation rate of the fabric is measured in accordance with the method for measuring the elongation rate under constant load in JIS-L-1018 “Testing method of knitted fabric”. For example, in a field that requires close contact with the human body, such as shirts and spats, to follow the movement of the body, the elongation is preferably 50% or more, more preferably 80% or more, and even more preferably 100%. That's it. However, if the elongation rate is too high, the dimensional stability may be deteriorated. Therefore, it is preferably 300% or less, and more preferably 250% or less. In order not to cause problems such as cracking at the time of use, the elongation recovery rate is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more.

  The conductive elastic knitted fabric of the present invention is preferably scoured and dried from a knitted raw machine to remove excess oil and impurities, and the shape is stabilized by heat setting. In addition, in order to make the conductive elastic knitted fabric of the present invention less susceptible to moisture, moisture, etc., the surface of the elastic knitted fabric can be subjected to resin processing such as urethane or silicone by coating or laminating method. .

  In the present invention, the method for measuring the electrical resistance value of the stretch knitted fabric will be described in Examples, but the change rate of the electrical resistance value when the fabric is stretched by 50% is preferably 20%, more preferably 15 % Or less, more preferably 10% or less. If the rate of change of the electrical resistance value exceeds 20%, the possibility that the knitted fabric cannot be used as an electronic device is considerably increased.

EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these.
Each characteristic of the conductive stretch knitted fabric of the present invention was measured according to the following method.
(1) Ratio of stitch number of conductive yarn In the stretchable knitted fabric, the ratio of the number of stitches formed by the conductive yarn to the total number of stitches in one complete structure constituting the knitted fabric was calculated.

(2) Conductivity in the plane direction Prepare a sample of 120 mm x 120 mm, apply the tester terminal to the exposed part of the conductive thread on the surface of the fabric about 1 cm from the outer periphery of the sample, and expose the other conductive thread. The other tester terminal was applied to the part where the contact was made, and the conductivity in the surface direction was measured.

(3) Electrical resistance value before and after fabric extension, and rate of change of electrical resistance value Prepare a 25 mm x 150 mm sample for each length and width, and use a clip with a 25 mm x 25 mm copper plate as the terminal. Alternatively, both ends of the sample in the horizontal direction were sandwiched by the clips so that the distance between the terminals was 100 mm. Next, in this state (0% elongation), the electrical resistance value between the terminals was measured in both the vertical direction and the horizontal direction using a tester. In addition, when the clip terminals were pulled and the distance between the terminals was 150 mm (elongated by 50%), the electrical resistance value at the time of extension was measured in the same manner. The change rate (%) of the electrical resistance value is a value obtained by dividing the electrical resistance value at 50% elongation by the electrical resistance value at 0% elongation and multiplying by 100.

[Example 1]
Using copper sulfide-bonded acrylic spun yarn with a yarn count of 2/52 as the conductive yarn (“Sunderron” manufactured by Nippon Kashiwa Dyeing Co., Ltd.), 110 dtex / 48f polyester yarn and 44 dtex / 3f polyurethane yarn (non-conductive yarn) Asahi Kasei Fibers Co., Ltd. “Roika” was used, and knitting was carried out under the following conditions using a 28 gauge tricot knitting machine (Karlmeier KS4) to obtain a raw machine.
・ Thread use L1 筬: Polyurethane yarn 44dtex / 3f (all-in)
L2 ポ リ エ ス テ ル: Polyester yarn 110 dtex / 48f (all-in)
L3 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 15 out)
L4 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 15 out)
-Knitting organization (see Fig. 1)
L1 筬 (Back 1): Denbi L2 筬 (Back 2): Cord L3 筬 (Front 1): 16 course atlas (combination of knit loop and insert)
L4 筬 (front 2): 16 course atlas (combination of knit loop and insert)

Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretch knitted fabric.
The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 10 mm formed by conductive yarns, and the total number of stitches in one complete structure constituting the knitted fabric is 256, Since the number of stitches formed by the conductive yarn is 14, the proportion of the number of stitches of the conductive yarn is 5.5%, the surface direction is conductive, flexible and highly stretchable, and the conductive yarn is thread-knitted. In addition, since the stitches are intermittently formed, adjacent loops formed by the same conductive yarn are not in contact with each other, and the rate of change in the electrical resistance value when stretched 50% is in the vertical direction. They were 5.5% and 5.1%, respectively.

[Example 2]
110 dtex / 24f copper sulfide-bonded nylon yarn (“Sunderlon” manufactured by Nippon Kashiwa Dyeing Co., Ltd.) is used as the conductive yarn, and 110 dtex / 48f polyester yarn and 44 dtex / 3f polyurethane yarn are used as the non-conductive yarn. Knitting was performed using a 28 gauge tricot knitting machine under the following conditions to obtain a raw machine.
・ Thread use L1 筬: Polyurethane yarn 44dtex / 3f (all-in)
L2 ポ リ エ ス テ ル: Polyester yarn 110 dtex / 48f (all-in)
L3 筬: Copper sulfide bonded nylon thread 110dtex / 24f (1 in / 15 out)
L4 筬: Copper sulfide bonded nylon thread 110 dtex / 24f (1 in / 15 out)
-Knitting organization (see Fig. 2)
L1 筬 (Back 1): Denbi L2 筬 (Back 2): Code L3 筬 (Front 1): 16 Course Atlas L4 筬 (Front 2): 16 Course Atlas

Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretch knitted fabric.
The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 10 mm formed by conductive yarns, and the total number of stitches in one complete structure constituting the knitted fabric is 256, Since the number of stitches formed by the conductive yarn is 30 because the conductive yarn is a yarn knitting knitting, the proportion of the number of stitches of the conductive yarn is 11.7%, the surface direction is conductive, and it is flexible and stretchable. The rate of change in the electrical resistance value when stretched by 50% was 10.0% and 10.9% in the vertical and horizontal directions, respectively.

[Example 3]
Using conductive yarn 2/52 copper sulfide bonded acrylic spun yarn as conductive yarn, 110 dtex / 48f polyester yarn and 44 dtex / 3f polyurethane yarn as non-conductive yarn, using 28 gauge tricot knitting machine Knitting was performed under the conditions described above to obtain a living machine.
・ Thread use L1 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 7 out)
L2 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 7 out)
L3 筬: Polyurethane yarn 44dtex / 3f (all-in)
L4 筬: Polyester yarn 110 dtex / 48f (all-in)
-Knitting organization (see Fig. 3)
L1 筬 (Back 1): 8 course atlas (combination of knit loop and insert)
L2 筬 (Back 2): 8 course atlas (combination of knit loop and insert)
L3 筬 (front 1): Denbi L4 筬 (front 2): Cord

Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretch knitted fabric.
The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 5 mm formed by conductive yarns, and the total number of stitches in one complete structure constituting the knitted fabric is 64, Since the number of stitches formed by the conductive yarn is 6, the proportion of the number of stitches of the conductive yarn is 9.4%, the surface direction is conductive, it is flexible and highly stretchable, and the conductive yarn is thread-knitted. In addition, since the stitches are intermittently formed, adjacent loops formed by the same conductive yarn are not in contact with each other, and the rate of change in the electrical resistance value when stretched 50% is in the vertical direction. They were 5.3% and 5.2%, respectively.

[Example 4]
110dtex / 24f copper sulfide-bonded nylon yarn is used as the conductive yarn, 110dtex / 48f polyester yarn and 44dtex / 3f polyurethane yarn are used as the non-conductive yarn, and a 28 gauge tricot knitting machine is used under the following conditions: Knitting and obtaining a living machine.
・ Thread use L1 筬: Copper sulfide bonded nylon thread 110dtex / 24f (1 in / 7 out)
L2 筬: Copper sulfide bonded nylon thread 110dtex / 24f (1 in / 7 out)
L3 筬: Polyurethane yarn 44dtex / 3f (all-in)
L4 筬: Polyester yarn 110dtex / 48f (all-in)
-Knitting organization (see Fig. 4)
L1 筬 (Back 1): 8-course atlas L2 筬 (Back 2): 8-course atlas L3 筬 (Front 1): Denbi L4 筬 (Front 2): Cord

Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretch knitted fabric.
The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 5 mm formed by conductive yarns, and the total number of stitches in one complete structure constituting the knitted fabric is 64, Since the conductive yarn is a yarn knitting knitting, the number of stitches formed by the conductive yarn is 14, so the proportion of the number of stitches of the conductive yarn is 21.9%, the surface direction is conductive, flexible and stretchable The rate of change in the electrical resistance value when stretched by 50% was 7.0% and 12.3% in the vertical and horizontal directions, respectively.

[Example 5]
Using conductive yarn 2/52 copper sulfide bonded acrylic spun yarn as conductive yarn, 110 dtex / 48f polyester yarn and 44 dtex / 3f polyurethane yarn as non-conductive yarn, using 28 gauge tricot knitting machine Knitting was performed under the conditions described above to obtain a living machine.
・ Thread use L1 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 3 out)
L2 筬: Copper sulfide bonded acrylic spun yarn 2/52 (1 in / 3 out)
L3 筬: Polyurethane yarn 44dtex / 3f (all-in)
L4 筬: Polyester yarn 110dtex / 48f (all-in)
-Knitting organization (see Fig. 5)
L1 筬 (Back 1): 4 course atlas (combination of knit loop and insert)
L2 筬 (Back 2): 4 course atlas (combination of knit loop and insert)
L3 筬 (front 1): Denbi L4 筬 (front 2): Cord

Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretch knitted fabric.
The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 3 mm formed by conductive yarns, and the total number of stitches in one complete structure constituting the knitted fabric is 16, while Since the number of stitches formed by the conductive yarn is 2, the proportion of the number of stitches of the conductive yarn is 12.5%, there is conductivity in the surface direction, and it is flexible and highly stretchable. In addition, since the stitches are intermittently formed, adjacent loops formed by the same conductive yarn are not in contact with each other, and the rate of change in the electrical resistance value when stretched 50% is the vertical direction. And 6.5% and 13.2%, respectively.

[Example 6]
110dtex / 24f copper sulfide-bonded nylon yarn is used as the conductive yarn, 56dtex / 48f polyester yarn and 44dtex / 3f polyurethane yarn are used as the non-conductive yarn, and a 28 gauge tricot knitting machine is used under the following conditions: Knitting and obtaining a living machine.
・ Thread use L1 筬: Copper sulfide bonded nylon thread 110dtex / 24f (1 in / 3 out)
L2 筬: Copper sulfide-bonded nylon thread 110 dtex / 24f (1 in / 3 out)
L3 筬: Polyurethane yarn 44dtex / 3f (all-in)
L4 筬: Polyester yarn 110dtex / 48f (all-in)
-Knitting organization (see Fig. 6)
L1 筬 (Back 1): Cord L2 筬 (Back 2): Cord L3 筬 (Front 1): Denbi L4 筬 (Front 2): Cord Next, the obtained raw machine is scoured and dried to remove excess oil and impurities Was removed, the shape was stabilized by heat setting, and the desired conductive stretchable knitted fabric was obtained.

  The obtained conductive elastic knitted fabric is a rhombus with a grid pattern of 2 mm formed by the conductive yarn, and the total number of stitches in one complete structure constituting the knitted fabric is 6, Since the number of stitches formed by the conductive yarn is 2 because the conductive yarn is a yarn knitting knitting, the proportion of the number of stitches of the conductive yarn is 33.3%, the surface direction is conductive, and it is flexible and stretchable. The rate of change of the electrical resistance value was 7.0% and 6.9% in the vertical and horizontal directions, respectively.

[Comparative Example 1]
110dtex / 24f copper sulfide-bonded nylon yarn is used as the conductive yarn, 110dtex / 48f polyester yarn and 44dtex / 3f polyurethane yarn are used as the non-conductive yarn, and a 28 gauge tricot knitting machine is used under the following conditions: Knitting and obtaining a living machine.
・ Thread use L1 筬: Polyurethane yarn 44dtex / 3f (all-in)
L2 ポ リ エ ス テ ル: Polyester yarn 110 dtex / 48f (all-in)
L3 筬: Copper sulfide bonded nylon thread 110dtex / 24f (all-in)
-Knitting organization (see Fig. 7)
L1 筬 (Back 1): Denbi L2 筬 (Back 2): Cord L3 筬 (Front 1): Denbi

Next, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a conductive elastic knitted fabric.
The obtained conductive elastic knitted fabric has 14 total stitches in one complete structure constituting the knitted fabric, whereas the conductive yarns have 14 stitches formed. Number ratio is 100%, it is conductive in the surface direction, flexible and stretchable, but the rate of change of electrical resistance value when stretched by 50% is 28.6% in the vertical and horizontal directions, respectively. It was 27.8%.

[Comparative Example 2]
Using conductive yarn 2/52 copper sulfide bonded acrylic spun yarn as conductive yarn, 110 dtex / 48f polyester yarn and 44 dtex / 3f polyurethane yarn as non-conductive yarn, using 28 gauge tricot knitting machine Knitting was performed under the conditions described above to obtain a living machine.
・ Thread use L1 筬: Polyurethane yarn 44dtex / 3f (all-in)
L2 ポ リ エ ス テ ル: Polyester yarn 110 dtex / 48f (all-in)
L3 筬: Copper sulfide bonded acrylic spun yarn 2/52 (all-in)
-Knitting organization (see Fig. 8)
L1 筬 (Back 1): Denbi L2 筬 (Back 2): Cord L3 筬 (Front 1): Cord

Next, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a conductive elastic knitted fabric.
The obtained conductive elastic knitted fabric has six stitches in one complete structure constituting the knitted fabric, while the number of stitches formed by the conductive yarn is six. Number ratio is 100%, it is conductive in the surface direction, flexible and stretchable, but the rate of change of electrical resistance value when stretched by 50% is 33.3% respectively in the vertical direction. It was 35.7%.

[Comparative Example 3]
Using conductive yarn 2/52 copper sulfide bonded acrylic spun yarn as conductive yarn, 110 dtex / 72f polyester yarn and 44 dtex / 3f polyurethane yarn as non-conductive yarn, using a 28 gauge tricot knitting machine Knitting was performed under the conditions described above to obtain a living machine.
・ Thread use L1 筬: Polyurethane yarn 44dtex / 3f (all-in)
L2 ポ リ エ ス テ ル: Polyester yarn 110 dtex / 48f (all-in)
L3 筬: Copper sulfide bonded acrylic spun yarn 2/52 (all-in)
-Knitting organization (see Fig. 9)
L1 筬 (Back 1): Denbi L2 筬 (Back 2): Code L3 筬 (Front 1): 8 Course Atlas

Next, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a conductive elastic knitted fabric.
The obtained conductive elastic knitted fabric has 64 stitches in one complete structure constituting the knitted fabric, while the number of stitches formed by the conductive yarn is 64. Number ratio is 100%, it is conductive in the surface direction, flexible and stretchable, but the rate of change of electrical resistance value when stretched by 50% is 48.1% in the vertical and horizontal directions, respectively. It was 48.1%.

[Comparative Example 4]
As the conductive yarn, 44 dtex / 13f silver-plated polyester yarn and 44 dtex / 13f silver-plated polyester yarn wrapped around 34 dtex polyurethane yarn 500 times / m are used and punched using a double knit circular knitting machine. Knitting was performed in the Roman organization to obtain a living machine (knitting organization not shown).
Subsequently, the obtained raw machine was scoured and dried to remove excess oil and impurities, and the shape was stabilized by heat setting to obtain a desired conductive stretchable knitted fabric.
The obtained conductive elastic knitted fabric was knitted with conductive yarn in all stitches, was conductive in the surface direction, was flexible and highly elastic, but had an electrical resistance value when stretched by 50%. The rate of change was 59.3% and 40.0% in the vertical and horizontal directions, respectively.

Various measurement results of the conductive elastic knitted fabrics obtained in Examples 1 to 6 and Comparative Examples 1 to 4 are shown in Table 1 below.

  The conductive stretch knitted fabric of the present invention is a conductive stretch knitted fabric having a small change in electrical resistance even when the fabric is deformed / stretched while having a flexible and high stretchability and maintaining excellent conductivity. Therefore, it can be suitably used as clothing products, wearable computer parts, various sensor parts, and the like.

Claims (4)

  A conductive elastic knitted fabric characterized in that the ratio of the number of stitches formed by the conductive yarn to the total number of stitches constituting the knitted fabric is 70% or less and is conductive in the surface direction.   The conductive elastic knitted fabric according to claim 1, wherein a ratio of the number of stitches formed by the conductive yarn to the total number of stitches constituting the knitted fabric is 35% or less.   The conductive elastic knitted fabric according to claim 1 or 2, wherein the conductive yarn intermittently forms stitches.   The electrically conductive stretch property according to any one of claims 1 to 3, wherein a rate of change of an electric resistance value when the knitted fabric is stretched by 50% is 20% or less in a vertical and horizontal direction of the knitted fabric. Knitted fabric.

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