WO2013051571A1 - Composite yarn for braiding, and electromagnetic shielding braided sleeve - Google Patents

Abstract

The objective of the present invention is to provide an electromagnetic shielding braided sleeve, and composite yarn for braiding the same, that not only has excellent electromagnetic shielding capability, but is light in weight, protects against twisting, minimizes bending, has good opening and broadening characteristics under external pressure from electrical wiring and the like, and furthermore has good fit with the object covered after application, resists end disintegration and generation of residual material during braiding, and despite excellent quality is also cost-effective. The composite yarn for braiding comprises a composite yarn (A) that is a parallel yarn including at least the following three components: a Z-wrapped multilayer wound yarn (2Z) having a configuration in which multiple layers of a narrow metal foil (F) are Z-wrapped around a core yarn (C), an S-wrapped multilayer wound yarn (2S) having a configuration in which multiple layers of a narrow metal foil (F) are S-wrapped around a core yarn (C), and a non-metallic yarn (R). Furthermore, the electromagnetic shielding braided sleeve comprises a sleeve-shaped braided body (B) of such composite yarn (A).

Description

Braided yarn and electromagnetic shielding braided sleeve

The present invention relates to a braided composite yarn (yarn bundle in which yarns necessary for use in a braid are aligned) configured using a specific metal foil wound yarn. The present invention also relates to an electromagnetic wave shielding braided sleeve using the braided yarn.

(Electromagnetic wave shielding braided sleeve)
Many documents are known about the electromagnetic wave shielding braided sleeve obtained by braiding a material obtained by winding a metal foil around a core yarn. The following Patent Documents 1 to 5 are documents found by searching from the viewpoint of finding a thing as close as possible to the present invention. The present invention is a considerable distance in terms of technical idea and configuration. There seems to be.

The term relating to “double winding of foil, gold yarn wire, silver yarn wire” is selected as a keyword, and “braiding using Z winding multilayer winding yarn and S winding multilayer winding yarn in the present invention” We searched for documents related to “combined yarns and braided sleeves”, but there are some references to metal foil double wound yarns, but the place where they are used is very different from the present invention. Not.

(Patent Document 1)
-1-
In Japanese Utility Model Publication No. 6-11599 (Patent Document 1, Japanese Utility Model Publication No. 1-86297), “a metal foil is wound around the surface of a thread in a spiral shape so as not to overlap an adjacent metal foil. ”,“ Making a plurality of the yarns together and braiding them into a sleeve shape to form an electromagnetic wave shielding sleeve ”.

-2-
In the part of the example, a yarn obtained by winding a 250-denier polyester yarn with a foil thickness of 0.027 mm and a foil width of 0.32 mm at a rate of 22 foil windings per 10 mm of yarn length, There is a description of a flexible braided sleeve for electromagnetic wave shielding, in which three of these are combined and braided to an inner diameter of 11.0 mm by a stringing machine with 64 strokes.

(Patent Document 2)
-1-
Japanese Patent Laid-Open No. 2001-291435 (Patent Document 2) describes a braided sleeve in which a predetermined number of strands are braided in a spiral shape, and a ground wire is braided independently of the braided structure. An electromagnetic wave shielding braided sleeve with a ground wire is shown.

-2-
In this document, one or a plurality of the above-described strands are formed by spirally winding a thin conductive metal foil made of copper foil or metal-plated copper foil around a core yarn made of synthetic fiber yarn. It is preferable to use the one that has been aligned (paragraph 0016), and when winding a thin metal foil in a spiral shape around the core thread, it is more flexible to make an appropriate gap so that the metal foil does not overlap. There are also descriptions such as being preferable in terms of bendability (paragraph 0016), being braided, being very flexible, and being stretchable and capable of widening in the radial direction (paragraph 0042).

(Patent Document 3)
-1-
In Japanese Utility Model Publication No. 3-130117 (Patent Document 3), a monofilament yarn made of synthetic fiber is wound with a copper foil plated with tin to form a yarn. An electromagnetic wave shielding wire covering material that is braided into a cylindrical shape to form a covering material is shown.

-2-
In this document, the best shielding effect and workability can be expected when one layer of copper monofilament yarn tin-plated in the left-handed (left-handed) direction (that is, Z-winding) is densely wound. It is also explained that an annealed copper wire is rolled to a width of 0.3 to 0.6 mm and a thickness of 0.027 to 0.035 mm, and nickel is applied to this.

(Patent Document 4)
-1-
Japanese Patent Application Laid-Open No. 2005-149963 (Patent Document 4) discloses a shield wire formed by laterally winding (or braiding) a thin conductive foil-like member around the outer periphery of an elastic core material (core yarn). A shield sleeve braided is shown.

-2-
When the conductive foil-shaped member is horizontally wound around the elastic core material (core yarn), it is preferable that the conductive foil-shaped member is horizontally wound so that a gap having a width shorter than the width of the conductive foil-shaped member is formed (paragraph 0024). 3), horizontal winding may be either right-handed or left-handed (paragraph 0024), description of the material and thickness of the elastic core material (core yarn) (paragraphs 0025 to 0026), conductive There are also mentions of specific examples of conductive foil-like members and descriptions of thickness and width (paragraphs 0027 to 0029).

(Patent Document 5)
-1-
In Japanese Patent Laid-Open No. 2003-60386 (Patent Document 5), as a typical embodiment, “a first yarn member 10 formed by spirally winding a metal foil around a bundle of thin fibers bundled (see FIG. 2). 1) ”and“ the second yarn member 20 (see FIG. 3) composed of a bundle of thin fibers bundled together ”are combined as shown in FIG. A covering for electromagnetic wave shielding which is made into a cloth (that is, braided into a sleeve shape) is shown.

-2-
In paragraphs 0003 and 0020 of this patent document 5, the braided sleeve of this patent document 5 is lighter than the braided sleeve of Japanese Utility Model Publication No. 6-11599 (the above-mentioned patent document 1) (only about 1/4 weight). There is a description that there is an advantage that.

-3-
In paragraphs 0019 to 0021 of Patent Document 5, when the second yarn member made of only synthetic fibers is used as the second yarn member (a bundle yarn obtained by bundling thin fibers), “at least several percent of heat Since it has a shrinkage rate, it can be made to shrink by applying heat after being attached (to an electromagnetic shield such as an electric wire) ”(see the data showing the heat shrinkage rate in FIG. 4) , "When cut, many synthetic fibers will be exposed on the cut surface, so if heat is applied to melt the synthetic fibers, the synthetic fibers can be welded together to prevent fraying." is there.

No. 6-11599 JP 2001-291435 A Japanese Utility Model Publication No. 3-130117 JP 2005-149963 A Japanese Patent Laid-Open No. 2003-60386

(Regarding Patent Documents 1 to 5)
The above Patent Documents 1 to 5 are orthodox and basic documents relating to a technique for obtaining a sleeve having electromagnetic wave shielding properties by braiding using a metal foil wound yarn. The constituent yarns are different and the braid structure is also different, and the effect of the sleeve obtained by the braiding is also different.

(Knitting method 1 using only the combined yarns of the metal foil single layer wound yarn)
-1-
A typical typical braided sleeve is a metal foil, such as copper foil, wound around one layer of a core yarn, usually in Z winding (S winding in some cases) ("metal foil single layer winding yarn") A predetermined number of yarns (for example, three in the embodiment of Patent Document 1) is wound around a bobbin, and the required number of bobbins is set on a braiding machine called a braider and then braided (joint It is produced by assembling a string so that the yarns cross each other), but there are the following problems or limitations. (Additionally, as the metal foil single-layer wound yarn, Z-winding single-layer winding yarn has been traditionally used conventionally, and the use of S-winding single-layer winding yarn is exceptional. This is probably because the foil winding device used is a Z winding device.)

-2-
That is, in order to obtain the desired electromagnetic shielding effect, the number of metal foil single-layer wound yarns constituting a bundle of combined yarns must be increased. Since the weight per unit length of the product increases, it is difficult to reduce the weight, and the use for in-vehicle applications may be restricted, and (b) the openability and wideness of the braided sleeve tend to be insufficient. Therefore, there is a possibility of causing problems such as poor work efficiency when extrapolating the braided sleeve to an object such as an electric wire.

(Knitting method 2 using a combined yarn a in which metal foil single-layer wound yarns are aligned and a combined yarn b in which synthetic resin yarns are aligned)
-1-
From the circumstances as described above, the inventor described above “a combined yarn a in which a plurality of metal foil single-layer wound yarns are aligned” and “a combined yarn b in which a plurality of synthetic resin yarns are aligned” We also examined the combination of the two crossings to be used for braiding. This braiding method 2 corresponds to the method described in Patent Document 5 mentioned above.

-2-
However, the braiding method 2 has a problem that distortion is likely to occur during braiding because the strengths and properties of the respective yarns a and b constituting the two types of yarn are different. Further, when the mesh of the braided sleeve expands and contracts, the strengths of the respective combined yarns a and b are different, which may cause yarn breakage due to rubbing.

-3-
In this braiding system 2, when the number of bundles of the “combined yarn a which is a bundle of metal foil single-layer wound yarns” is increased for the purpose of improving the electromagnetic wave shielding effect, Since the foil single-layer wound yarn includes a metal foil having a large specific gravity, there is a problem that the weight of the braided sleeve is increased and the cost is increased. In addition, when the number of bundles of “combined yarns a in which a plurality of metal foil single-layer wound yarns are aligned” is increased, the opening and widening properties of the braided sleeve are also reduced, and the object such as an electric wire is reduced. There was also a problem that the insertability during extrapolation deteriorated.

-4-
On the other hand, conversely to the above, when the number of bundles of “combined yarn b which is a bundle of multiple synthetic resin yarns” is increased, the weight of the braided sleeve is reduced and the opening and widening properties are increased. However, this time, the electromagnetic wave shielding property was unavoidably lowered.

-5
In the above-described braiding method 2, in addition, two types of combined yarns a and b having different strengths and properties are wound on separate bobbins and used for braiding. Material) is often wasted, and it was difficult to make the remaining material zero.

(Knitting method 3 using only combined yarns with metal foil multi-layer wound yarns)
-1-
Accordingly, the present inventor has come up with the idea of using a metal foil “multi-layer” wound yarn instead of the metal foil “single-layer” wound yarn. That is, a composite yarn in which a predetermined number of metal foils such as copper foil wound in Z layers (S winding in some cases) on the core yarn ("metal foil multilayer winding yarns") are aligned. Prepared and tried to braid the required number of bundles of the combined yarn.

-2-
According to this braiding method 3, since the metal foil is wound around the core yarn in multiple layers, it becomes possible to increase the conductivity (that is, to secure the electromagnetic wave shielding property). (B) Therefore, it is possible to make a braided sleeve with a small diameter, and (c) A single component yarn is formed by winding a metal foil on one core yarn. Since it is a wound one, the weight of the core yarn per layer of the metal foil is significantly reduced compared to the conventional metal foil single layer wound yarn, and thus the cost of the metal foil wound yarn is reduced. There are advantages.

-3-
However, a sleeve obtained by braiding only a composite yarn in which a predetermined number of metal foil multi-layer wound yarns are aligned has a remarkable twist of the braided sleeve, there is a risk of cutting due to rubbing, There is room for improvement in that there is a risk of this.

(Knitting method 4 using a composite yarn made of metal foil multi-layer winding yarn and a synthetic resin yarn)
The present inventor further attempted to use the above-mentioned “combined yarn in which the metal foil multilayer wound yarns are aligned” and “combined yarn in which the synthetic resin yarns are aligned” so as to cross each other and provide it for braiding. However, there was a limit similar to the case of the “braiding method 2 using the combined yarn a in which the metal foil single-layer wound yarns are aligned and the synthetic resin yarn b” described above.

(Knitting method 5 using only a composite yarn comprising both a metal foil multilayer wound yarn and a synthetic resin yarn)
-1-
As a result of repeated investigations, the inventor of the present invention has drawn both the Z-winding (in some cases S-winding) metal foil multi-layer winding yarns and the synthetic resin yarns into a combined yarn, and the combined yarns are crossed with each other. Tried to braid like. This is because the metal foil multi-layer wound yarn has high conductivity, so that necessary conductivity can be ensured even if a synthetic resin yarn is incorporated.

-2-
If this braiding method 5 is adopted, (a) the obtained braiding sleeve can improve the opening and widening properties when extrapolated to an object such as an electric wire by the restoring force of the synthetic resin yarn. (B) Since synthetic resin yarn is incorporated in the combined yarn (yarn bundle), yarn breakage caused by rubbing due to the expansion and contraction of the mesh of the braided sleeve can be prevented. The flexibility and wear resistance can be exerted on the entire combined yarn (yarn bundle), and (d) the shape of the waveform at the time of braiding is memorized in the synthetic resin yarn in the combined yarn by means of knitting Since the shape retention of the entire sleeve can be improved, excellent effects such as that the end of the sleeve will not easily fray without special end treatment for the braided sleeve are exhibited. Can be expected.

-3-
According to the above-described braiding method 5, it can be said that the present invention has considerably approached the goal to be achieved, but the following problem still remains. That is, even with this braiding method 5, there is a problem that the obtained braided sleeve is likely to be twisted.

(Object of invention)
Under such a background, the present invention relates to a braided composite yarn constituted by using a specific metal foil wound yarn and an electromagnetic wave shielding braided sleeve using the braided composite yarn. Not only has shielding properties, but also lightness, anti-twisting, bend restraint (proper properties that are not too flexible and exhibit moderate elasticity), opening and widening properties when extrapolated to objects such as electric wires, and mounting Electromagnetic wave shield that is effective in terms of fitability to the target object afterwards, prevention of edge cracks, and prevention of residual material during braiding, and is advantageous in terms of cost despite its excellent quality. It is an object of the present invention to provide a sex braid sleeve and a braided yarn for the same.

The yarn for braiding of the present invention is
Z-coiled multi-layer wound yarn (2Z) having a configuration in which a thin metal foil (F) is wound in a Z-coil and a multi-layer with respect to the core yarn (C),
S-coiled multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound in S-coil and multi-layers around the core yarn (C), and
Non-metallic thread (R)
Consisting of a combined yarn (A) that is an aligned yarn containing at least three of
It is characterized by.

The electromagnetic wave shielding braided sleeve of the present invention is
Z-coiled multi-layer wound yarn (2Z) having a configuration in which a thin metal foil (F) is wound in a Z-coil and a multi-layer with respect to the core yarn (C),
S-coiled multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound in S-coil and multi-layers around the core yarn (C), and
Non-metallic thread (R)
Consisting of a sleeve-like braided body (B) of a combined yarn (A) which is an aligned yarn containing at least three of the following:
It is characterized by.

In the present invention, the following excellent effects are exhibited.

(Function / Effect 1 / Torsion prevention)
-1-
In one bundle of combined yarns (A), “Z wound multi-layer wound yarn having a configuration in which a thin metal foil (F) is wound around Z core and in multiple layers with respect to the core yarn (C) “(2Z)” and “S wound multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound in S winding and in multiple layers with respect to the core yarn (C)” Since both are included, there is almost no unbalance in the left and right due to the winding direction of the metal foil winding yarn, and therefore the cause of twisting of the sleeve after braiding does not occur. Incidentally, the twisting of the sleeve cannot be prevented by only one of the Z-winding multilayer winding yarn (2Z) and the S-winding multilayer winding yarn (2S) described above.

-2-
In addition, as described in claims 2 and 4, the above-mentioned combined yarn (A) is further wound into a metal foil single-layer wound yarn (a narrow metal foil (F) is wound into a Z winding or an S winding with respect to the core yarn (C)). A braided article resulting from such a metal foil single-layer wound yarn even when it includes a Z- wound single-layer wound yarn (1Z) or an S-winding single-layer wound yarn (1S)) having a rotated configuration Since the twisting of the sleeve is small, the sleeve after braiding is not affected so much as to cause a practical problem with respect to twisting.

(Effect 2 / Lightweight)
-1-
Since the electromagnetic shielding properties (conductivity) depend on the weight of the metal component of the yarn member, which is the constituent yarn of the combined yarn (that is, depends on the number of strips of the metal foil), the metal foil single layer wound yarn is the main yarn. Even in the conventional product as a member, the necessary conductivity can be ensured by increasing the number of yarns of the metal foil single-layer wound yarn that is a constituent yarn of the combined yarn. For example, the number of strips of metal foil in one composite yarn comprising four metal foil single-layer wound yarns is four (the weight of one composite yarn at this time is four metal foils). And the weight of the four core yarns), the necessary electrical conductivity can be ensured by braiding using an appropriate number of the combined yarns.

-2-
On the other hand, taking the case of using a metal foil two-layer winding yarn as an example in the present invention, one Z-winding two-layer winding yarn (2Z) and one S-winding two-layer winding yarn (2Z) are included. The total weight of the two two-layer wound yarns is the sum of the weight of the four metal foils and the weight of the two core yarns. When this is compared with the total weight of the four single-layer wound yarns, the weight is reduced by the weight of two core yarns. That is, according to the present invention, in order to ensure the target electromagnetic wave shielding property (conductivity), the weight can be surely reduced as compared with the conventional product using the metal foil single layer wound yarn, and the core yarn The number of yarns can be reduced, which is advantageous from the viewpoint of core yarn cost.

(Function / Effect 3 / Extrapolation to the object)
-1-
Since the braided sleeve obtained by the braiding method 1 using the combined yarn in which the metal foil single-layer wound yarns are aligned is too flexible, it is not easy to use when the sleeve is extrapolated to an object such as an electric wire.
The braided sleeve obtained by the braiding method 2 using the combined yarn a in which the metal foil single-layer wound yarns are aligned and the combined yarn b in which the synthetic resin yarns are aligned is the braided sleeve obtained by the braiding method 1 described above. Therefore, the extrapolation to the object is inferior.
On the other hand, the braided sleeve obtained by the braiding methods 3, 4, and 5 using the metal foil multi-layer wound yarn is good if attention is paid only to the extrapolation to the object. There are disadvantages.

-2-
On the other hand, the braided composite yarn (A) in the present invention constitutes the non-metallic yarn (R) together with the above-mentioned Z-winding multilayer winding yarn (2Z) and S-winding multilayer winding yarn (2S). Includes as. In terms of the degree of rigidity, the former Z-winding multilayer winding yarn (2Z) and S-winding multilayer winding yarn (2S) correspond to rigid materials, and the latter non-metallic yarn (R) is relatively Is equivalent to soft material. Therefore, the sleeve-like braided body (B) obtained by braiding the braided yarn (A) has an appropriate stiffness (waist) and tension (tension) as a whole, so it is too flexible or too flexible. In addition, since it is not excessively rigid, the extrapolation to an object such as an electric wire is good, and it is very convenient to use.

(Function / Effect 4 / Wideness and fit to object)
The braided composite yarn (A) in the present invention includes a non-metallic yarn (R) as a constituent yarn together with the above-mentioned Z-winding multi-layer winding yarn (2Z) and S-winding multi-layer winding yarn (2S). The sleeve (B) is obtained by braiding the combined yarn (A). Since this non-metallic thread (R) has an appropriate resilience or elasticity to return to its original shape, the braided sleeve (sleeve-shaped braid (B)) after braiding is as described above. In addition to being excellent in extrapolation (opening) to objects such as electric wires, it also has good widening properties, and after covering the objects such as electric wires, tighten them so that they are tightly wrapped ( Good fit).

(Effect 5 / Prevention of sleeve end flaking)
The invention of claim 5 of the present application is characterized in that, in the sleeve-shaped braid (B), the non-metallic yarn (R) stores the shape of the waveform at the time of the braiding. If such a contrivance is taken, when the braided sleeve is cut to a predetermined length, the variation of the sleeve end, which is the cut end, is greatly reduced, which is extremely preferable in terms of handling.

(Function / Effect 6 / Prevention of residual material during braiding)
-1-
The braiding proceeds by setting a predetermined number of bobbins wound with yarn at a predetermined position of the braiding machine and braiding the yarn while paying out the yarn from the bobbin. For the same type of thread, it is not so difficult to control so that the thread wound on all bobbins is used up. On the other hand, when different types of yarns X and Y are used for braiding, their extensibility and the like are slightly different, so that when one of the yarns is used up, the other yarn often remains. is there.

-2-
The sleeve-like braided body (B) of the present invention is composed of at least three of a Z-winding multi-layered winding thread (2Z), an S-winding multi-layered winding thread (2S) and a non-metallic thread (R). The combined yarn (A) included as the constituent yarn is used. In this way, since the braiding is performed by crossing the necessary number of bundles (A) of different types of constituent yarns into one yarn bundle, it is easy to braid so that no remaining material is generated.

Hereinafter, the present invention will be described in detail. ("Z winding" is synonymous with "left winding", and "S winding" is synonymous with "right winding".)

[Synthetic yarn for braiding, synthetic yarn (A)]
(Mixed yarn (A))
The combined yarn (A) in the braided composite yarn of the present invention has at least the following three members, that is,
A Z-wrapped multi-layer wound yarn (2Z) having a configuration in which a thin metal foil (F) is wound around the core yarn (C) in a Z-coil and a multi-layer;
An S-winding multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound around the core yarn (C) in an S-winding and multi-layer; and
・ Non-metallic thread (R)
Are included as constituent yarns. The combined yarn (A) is a combination of these constituent yarns. (If necessary, loose twist can be applied, but the control conditions during the braiding operation are complicated and there are few merits, so it is normal to use a yarn bundle that is simply aligned.)

(Z winding multi-layer winding yarn (2Z), S winding multi-layer winding yarn (2S))
-1-
The number of “multi-layer” in the Z-winding multi-layer winding yarn (2Z) is not limited, but it is preferably 2 layers, and usually 3 layers at most. The increase in the number of layers is advantageous from the viewpoint of electromagnetic shielding properties, but is disadvantageous in terms of weight and flexibility.

-2-
Further, the number of layers in the S-winding multi-layer winding yarn (2S) is preferably two layers as in the case of the Z-winding multi-layer winding yarn (2Z), and up to three layers at most. It is normal to do.

-3-
In the combined yarn (A), the number of Z-winding multi-layer winding yarns (2Z) and S-winding multi-layer winding yarns (2S) is usually the same, such as one each and two each. Typically, one each is used.
However, when the required performance of the braided sleeve permits, for example, one can be one and the other can be two. In this case, in order to supplement the role of the smaller number of multilayer winding yarns, one or two single-layer winding yarns having the same winding method as the smaller number of multilayer winding yarns are used. It is desirable to incorporate in the combined yarn (A). This is a device for suppressing twisting as much as possible.

-4-
As said core thread (C),
Synthetic fibers such as polyester fibers, polyamide fibers, acrylic fibers, polyimide fibers, polyolefin fibers, fluororesin fibers, and other various heat-resistant fibers;
Plant-derived fibers and animal-derived fibers;
Inorganic fiber such as glass fiber and carbon fiber;
Often used are monofilament yarns and multifilament yarns.
In many cases, the thickness of the core yarn (C) is, for example, about 100 to 700 denier or around, preferably about 150 to 500 denier.

-5
As said metal foil (F), although there is no limitation in particular in the kind of metal, copper foil, tin plating copper foil, nickel plating copper foil, etc. are used suitably. Here, the plating foil subjected to metal plating has a plating layer in addition to the metal foil, but is counted as one (one layer) metal foil (F).
The width of the metal foil (F) is not particularly limited, but is usually about 0.1 to 2 mm or around that. The thickness of the metal foil (F) is usually about 5 to 70 μm or around, preferably about 10 to 60 μm.
The metal-plated copper foil can be obtained, for example, by rolling an annealed copper wire having a diameter of about 0.05 to 0.4 mm and plating it with a metal of about 1 to 2 μm, for example.

-6-
When winding the metal foil (F) around the core yarn (C), the first layer is preferably wound with a slight gap so that the foil does not overlap. It is preferable that the second layer is wound with a slight gap so that the foils do not overlap, and the second layer is wound so as to cover the gap of the first layer foil as the lower layer as much as possible. By paying attention to the manner of winding the foil as described above, the flexibility of the Z-winding multilayer winding yarn (2Z) and the S-winding multilayer winding yarn (2S) while ensuring the necessary electromagnetic wave shielding property or A decrease in flexibility can be minimized.

-1-
(Non-metallic thread (R))
Another one of the constituent yarns in the combined yarn (A) is a non-metallic yarn (R). As the non-metallic yarn (R) at this time, there are various types of resins including polyester resins, polyamide resins, acrylic resins, polyimide fibers, polyolefin fibers, fluororesin fibers, and other various heat resistant fibers. Synthetic monofilament yarns and multifilament yarns are often used, and yarns made of elastomer resins such as polyurethane can also be used. In addition to the synthetic fiber yarn, it is also preferable to use glass fiber or carbon fiber.
The thickness of the non-metallic yarn (R) (in the case of a multifilament yarn, the overall thickness) is often about 0.1 to 0.6 mm in diameter or around that.

-2-
This non-metallic yarn (R) is used in the “effects 3, 4 and 5” of the “Effects of the Invention” in the knitting of the combined yarn (A) detailed above and in terms of the properties and performance of the braided product. It plays an important role as mentioned in the section.

(Z winding single layer winding yarn (1Z) or S winding single layer winding yarn (1S))
-1-
The above-mentioned combined yarn (A) further comprises a Z-wound single-layer wound yarn (1Z) having a configuration in which a narrow metal foil (F) is wound around the core yarn (C) in a Z winding or an S winding. Or it is especially preferable that at least one of the S wound single layer wound yarn (1S) is included as a constituent yarn. At this time, it is possible to use only one (or two) Z winding single layer winding yarn (1Z), or one (or two) using only S winding single layer winding yarn (1S). , Both may be used one by one. From the viewpoint of the lightness of the entire combined yarn (A), it is optimal to use only one of the Z-winding single-layer winding yarn (1Z) and the S-winding single-layer winding yarn (1S). Even in this case, the final braided body (B) does not adversely affect the twist prevention.

-2-
These Z-winding or S-winding single-layer wound yarns (1Z) and (1S) are different depending on only the Z-winding multilayer winding yarn (2Z) and the S-winding multilayer winding yarn (2S) described above. This is effective for complementing the electromagnetic shielding properties when the electromagnetic shielding properties are insufficient. These single-layer wound yarns (1Z) and (1S) are more flexible than the above-mentioned multi-layer wound yarns (2Z) and (2S), and are incorporated into the single-layer wound yarns. Therefore, the combined yarn (A) becomes bulky, which is preferable in terms of physical protection of an object such as an electric wire. In addition, the sleeve diameter can be easily set.

[Electromagnetic wave shielding braided sleeve, braided body (B)]
-1-
By braiding the combined yarn (A) made of the above-described constituent yarns, an electromagnetic wave shielding braided sleeve made of a sleeve-like braided body (B) is produced. A device called a braider is used for the braiding.

-2-
Before braiding, during braiding, or after braiding, the non-metallic yarn (R) in the braided structure stores a corrugated or uneven shape in the sleeve-shaped braid (B) by appropriate means. It is desirable to make it.
As such shape memory means, for example, a shape memory resin yarn is used as a non-metallic yarn (R) to be used for braiding, and the shape is memorized in advance during or after braiding; A method of heating or / and pressurizing the entire region or the entire braided sleeve, or a method of quenching conversely. Here, the “heating” of the sleeve can be performed by using a heated gas, a heated contact body, or using radiant heat.
This makes it possible to open the braided sleeve, extrapolate the braided sleeve to an object such as an electric wire, widen the sleeve and fit the object after coating, and prevent the sleeve cutting part from being loose. Therefore, handling and operability become very smooth.

-3-
The braided sleeve thus obtained is cut to an appropriate length according to the demands of the customer, and is used in such a manner that it is covered with a covering object such as an electric wire or an electric wire bundle (harness). Examples of wires or wire bundles are bare wires such as single wires, concentric stranded wires, compound stranded wires, flat stranded wires, braided wires, copper core aluminum wires; silk windings, cotton windings, enameled wires, vinyl wires, cords, etc. Insulated wires;
In addition, it is also possible to produce a braided sleeve by braiding the combined yarn (A) of the present invention directly around an object such as an electric wire.

Next, the present invention will be further described with reference to examples.

(Preparation of materials)
(Preparation of Z-winding multilayer winding yarn (2Z) and S-winding multilayer winding yarn (2S))
Width of tinned copper wire rolled into core yarn (C) made of polyester multifilament yarn having a diameter of 0.1 mm (60 filaments) using a foil winding device for Z winding A copper foil of 0.3 mm and a thickness of 30 μm (exactly tin-plated copper foil) is wound in a Z-winding and with a small gap between them, and a second layer of copper foil (exactly tin The plated copper foil) was wound in a Z-winding and with a small gap therebetween to produce a “Z-wrapped multilayer wound yarn (2Z)”. When winding the second layer, attention was paid so as to cover the gap of the first layer foil as the lower layer.

The first layer and the second layer were wound under the same conditions as described above except that a foil winding device for S winding was used, and “S winding multi-layer winding yarn (2S)” was produced.

(Production of Z-winding single-layer winding yarn (1Z) and S-winding single-layer winding yarn (1S))
A polyester monofilament yarn having a diameter of 0.1 mm was used as the core yarn (C), and the foil was a single layer wound. 1Z) ”and“ S wound single layer wound yarn (1S) ”. In the examples and comparative examples described later, the Z-wound single-layer wound yarn (1Z) produced in large quantities in relation to the foil winding device was used.

(Preparation of non-metallic thread (R))
As the non-metallic yarn (R), a polyester monofilament yarn having a diameter of 0.25 mm, which is an example of a synthetic fiber yarn, was prepared.

(Preparation of yarn)
The yarns prepared above were drawn together to produce a composite yarn 1 comprising the combination yarns shown in Table 1. FIG. 1 is a schematic explanatory view showing a representative example of the constituent yarns of the composite yarn (A), and shows the composite yarn (A) used in Example 1. FIG.
The synthetic yarn 1 of Example 1 is “the synthetic yarn (A) of the present invention”, and the synthetic yarn 1 of Comparative Examples 1 to 3 is a synthetic yarn for comparison. These synthetic yarns 1 are used alone for braiding. Is done.
A composite yarn 1 of Comparative Example 4 (a composite yarn composed of three Z-wound single-layer wound yarns (1Z)) is a composite yarn 2 (polyester multifilament yarn having 60 filaments) not listed in Table 1 ( The diameter is 0.18 mm)) and is used for braiding.

[Table 1]

 
 

(Production and evaluation of braided body)
(Preparation of braided body)
For Example 1, a braided body (B) was produced by braiding with a braider (braiding machine) using only the yarn 1 shown in Table 1 above. In the braiding, the number of strokes was 48 or 64, the number of stitches was 4.0 or 3.5, and the sleeve folding width was 22 mm, 20 mm, 18 mm, or 12 mm.
For Comparative Examples 1 to 3, braiding was performed with a braider (braiding machine) using only the yarn 1 shown in Table 1 above (48 strokes or 64 strokes), and braiding with various stitch numbers and various folding widths. The body was made.
For Comparative Example 4, braiding (braiding machine) was performed using two types of the above-described mixed yarn 1 and combined yarn 2, and the number of hits was Z single-layer wound yarn 32 and further polyester multifilament yarn 32 A total of 64 strikes were crossed to produce a braided body with 4 stitches and a folding width of 17 mm.
The braided body (B) of Example 1 (also Examples 2 and 3 to be described later) and the braided bodies in Comparative Examples 1, 2, 3, and 4 are heated and pressurized during or after the braiding. Thus, attention was paid so that the non-metallic yarn that is the constituent yarn in the synthetic yarn 1 or the synthetic yarn 2 can memorize the shape of the cross structure of the braided product. (Comparative Example 3 does not use a thread member corresponding to a non-metallic thread, but the same means was taken to match the conditions.)

(Evaluation of braided body)
Table 2 shows the evaluation items and results for the obtained braided body.

[Table 2]
 

 
 

(Description of evaluation items in Table 2)
-Conductivity (resistance value) is the resistance value between unit lengths (plane resistance value between 2 m).
・ Sleeve weight is the weight per meter of sleeve.
-Twist is the number of occurrences of 360 ° twist between sleeves 1m.
-With regard to the amount of bending, with the sleeve folded in a flat state overhanging 100 mm from the end of the horizontal support base, the load was applied by inserting a 3.6 g clip at the end of the overhanging portion, and at that time The amount of deflection of the sleeve tip was measured.
・ Fit is determined by measuring the contraction time of the insertion slot after widening the sleeve.
-To measure the degree of variation in the insertion slot, tap the sleeve tip 5 times on the desk and measure the variation width.
・ For the yield state, measure the amount of remaining material after braiding (remaining amount of excess yarn). (In Comparative Example 4, 7% of the remaining material of the Z wound single layer wound yarn (1Z) is generated.)

(What the data in Table 2 shows)
-1-
In Example 1 and Comparative Examples 1 to 4, the number of stitches at the time of braiding and the folding width of the braided body do not exactly match, so the absolute values of the numerical values cannot be directly compared, but the data in Table 2 Can be understood as follows.

-2-
Conductivity (resistance value) related to electromagnetic wave shielding is generally proportional to the total number of metal foils per bundle of combined yarns. If the braiding conditions are unified, the total number of metal foils per bundle of combined yarns It can be said that Example 1, Comparative Example 2, and Comparative Example 3 in which the number of strips is all five are substantially equivalent in conductivity.
In Comparative Example 1, the total number of metal foils per bundle of combined yarns is as small as 3, so that the conductivity is insufficient as compared with Example 1, Comparative Example 2, and Comparative Example 3.
In Comparative Example 4, the total number of metal foils per bundle of synthetic yarn 1 is three as in Comparative Example 1, but braided with the same number of strokes as synthetic yarn 2 (polyester multifilament yarn) having no metal foil. Therefore, the resistance value is as large as 109 mΩ (much larger than Comparative Example 1), and the electromagnetic wave shielding property is insufficient.

-3-
Regarding the sleeve weight, Comparative Example 1 and Comparative Example 4 in which the total number of metal foils per bundle of combined yarns is light, but the essential conductivity is considerably inferior to the other examples.
On the other hand, the sleeve weight (45 to 50 g level) of Example 1, Comparative Example 2, and Comparative Example 3 can be said to be medium, but the conductivity, which is the first purpose of the braided sleeve, is ensured. In view of this, such a weight is sufficiently acceptable from the viewpoint of practicality.

-4-
As for the twisting condition, Example 1 and Comparative Example 3 in which a braided yarn 1 including one each of a Z-winding multilayer winding yarn (2Z) and an S-winding multilayer winding yarn (2S) is used. The twist is not generated in the braided sleeve.
On the other hand, Comparative Example 1 using three Z-wound single-layer wound yarns (1Z) as the constituent yarns of the composite yarn 1 has one twist and has a tendency to twist.
Comparative Example 2 using two Z-winding multi-layer winding yarns (2Z) and one Z-winding single-layer winding yarn (1Z) as constituent yarns of the combined yarn 1, and Z-winding single-layer winding Compared with Comparative Example 4 in which three yarns (1Z) are used, the number of twisted portions is as many as five times, which is a big problem for the quality of the braided sleeve.

-5
As for the amount of deflection related to the degree of flexibility, Example 1 and Comparative Example 2 are good. Comparative Example 1 tends to be slightly too flexible, Comparative Example 3 tends to be much more flexible than Comparative Example 1, and Comparative Example 4 is clearly too flexible. When the amount of bending becomes large (that is, when it becomes too flexible), the extrapolation property of the braided sleeve to an object such as an electric wire decreases.

First, the reason why the bending amount of the braided product of Example 1 and Comparative Example 2 is as small as 40 mm (having tension) is that Example 1 and Comparative Example 2 are metal foil multilayer wound yarns (2Z, 2S) as the combined yarn 1. ) Are used (the composite yarn 2 is not used), and the composite yarn 1 is understood to be based on the fact that it contains a non-metallic yarn (R).

The reason why the bending amount of the braided product of Comparative Example 1 is slightly large (slightly flexible) is 43 mm. This Comparative Example 1 is common to Example 1 in that one non-metallic yarn (R) is used for the combined yarn 1. However, the other yarn constituting the composite yarn 1 is only the metal foil single-layer wound yarn (1Z), and the metal foil multilayer wound yarn (2Z, 2S) is used as in Example 1. It is understood that it is based on not.

The reason why the amount of bending of the braided product of Comparative Example 3 is relatively large at 45 mm (relatively flexible) is that Comparative Example 3 is similar to Example 1 in that the metal foil multilayer wound yarn (2Z, 2Z, 2S) is used (the combined yarn 2 is not used), it is understood that the combined yarn 1 is based on the fact that it does not contain the non-metallic yarn (R).

The reason why the amount of bending of the braided product of Comparative Example 4 is as large as 50 mm (too flexible) is that, in consideration of the fact that Comparative Example 4 uses a polyester multifilament yarn as the yarn 2, It is understood that this is based on not using the metal foil multilayer wound yarn (2Z, 2S).

-6-
As for the fit, in Example 1 and Comparative Examples 1 and 2, since the synthetic yarn 1 includes the non-metallic yarn (R), the opening of the sleeve, the extrapolation to an object such as an electric wire, and the widening In addition to the properties, favorable results are given not only in terms of tightening properties (fitness) of the coated electric wires and the like.
On the other hand, in Comparative Examples 3 and 4 in which the non-metallic yarn (R) is not included in the synthetic yarn 1, the widening property and the fit feeling are inferior, and the practical usability when using the sleeve is very poor. be able to.
In Comparative Example 4, the yarn 2 (multifilament yarn) is braided together with the yarn 1, but it has not succeeded in improving the widening property (fit feeling).

-7-
Regarding the degree of variation of the sleeve insertion opening (opening), the first yarn containing the non-metallic yarn (R) in the synthetic yarn 1 and the comparative examples 1 and 2 are good, while the middle yarn 1 Comparative Examples 3 and 4 that did not contain the non-metallic yarn (R) were inferior.

-8-
Regarding the yield state (remaining material amount), Example 1 and Comparative Examples 1 to 3 in which the braiding is performed using only one type of the synthetic yarn 1 can be easily knitted so that no remaining material is generated. In Comparative Example 4 using two types of synthetic yarn 1 and synthetic yarn 2 having different properties, it is extremely difficult to braid so as not to generate a residual material. Generation | occurrence | production of this remaining material is directly connected with the raise of the cost of the braided sleeve which is a product.

-9-
As shown in Table 2, only the present invention according to Example 1 satisfies all the items relating to the manufacture of the braided sleeve and the quality of the braided sleeve, and the industrial utility and contribution of the present invention are remarkable. It can be said that there is.

(Example 2)
In Example 1 of Table 1, as constituent yarns of the synthetic yarn 1, “one Z-winding multilayer winding yarn (2Z), one S-winding multilayer winding yarn (2S), one Z-winding single layer” A total of four yarns are used: one wound yarn (1Z) and one non-metallic yarn (R) made of synthetic resin yarn. The case where the synthetic yarn 1 in which only the yarn (1Z) was omitted was also used for braiding.

At this time, except for the resistance value in Table 2 being 37 mΩ and the sleeve weight in Table 2 being 48 g, almost the same results as in Example 1 were obtained. From this, it can be seen that preferable results similar to those of the first embodiment are obtained in the second embodiment.

(Example 3)
In Example 1 of Table 1, as constituent yarns of the synthetic yarn 1, “one Z-winding multilayer winding yarn (2Z), one S-winding multilayer winding yarn (2S), one Z-winding single layer” A total of four yarns, one wound yarn (1Z) and one non-metallic yarn (R) made of synthetic resin yarn, are used. As Example 3, non-metallic yarn (R) As for the case where the synthetic yarn 1 using “glass filament multifilament yarn having 60 filaments and a diameter of 0.25 mm” was used, braiding was performed.

At this time, almost the same result as in Example 1 was obtained except that the resistance value in Table 2 was 31 mΩ and the sleeve weight in Table 2 was 54 g. From this, it can be seen that the result of Example 3 is also as good as that of Example 1.

The electromagnetic wave shielding braided sleeve of the present invention comprising the sleeve-like braided body (B) of the above-mentioned combined yarn (A) is suitable for the purpose of covering an electric wire or a bundle of electric wires and exhibiting an intended electromagnetic wave shielding property. used.

It is the typical explanatory view showing the typical example of the constituent yarn of the combined yarn (A).

(A) ... compound yarn,
(C) Core yarn,
(F) Metal foil,
(2Z) ... Z winding multilayer winding yarn,
(2S) ... S winding multilayer winding yarn (R) ... non-metallic yarn,
(1Z) ... Z winding single layer winding yarn,
(1S) ... S winding single layer winding yarn

Claims (5)

1. Z-coiled multi-layer wound yarn (2Z) having a configuration in which a thin metal foil (F) is wound in a Z-coil and a multi-layer with respect to the core yarn (C),
   S-coiled multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound in S-coil and multi-layers around the core yarn (C), and
   Non-metallic thread (R)
   Consisting of a combined yarn (A) that is an aligned yarn containing at least three of
   Yarn for braiding characterized by
2. The above-mentioned combined yarn (A) is a Z-wound single-layer wound yarn (1Z) having a configuration in which a narrow metal foil (F) is wound around the core yarn (C) in a Z-winding or S-winding Or the braided synthetic yarn of Claim 1 which contains at least one of S winding single layer winding yarn (1S) as a constituent yarn.
3. Z-coiled multi-layer wound yarn (2Z) having a configuration in which a thin metal foil (F) is wound in a Z-coil and a multi-layer with respect to the core yarn (C),
   S-coiled multi-layer wound yarn (2S) having a configuration in which a thin metal foil (F) is wound in S-coil and multi-layers around the core yarn (C), and
   Non-metallic thread (R)
   Consisting of a sleeve-like braided body (B) of a combined yarn (A) which is an aligned yarn containing at least three of the following:
   Electromagnetic wave shielding braided sleeve characterized by
4. The above-mentioned combined yarn (A) is a Z-wound single-layer wound yarn (1Z) having a configuration in which a narrow metal foil (F) is wound around the core yarn (C) in a Z-winding or S-winding 4. The electromagnetic wave shielding braided sleeve according to claim 3, comprising at least one of S-wound single-layer wound yarn (1S) as a constituent yarn.
5. The electromagnetic shielding braided sleeve according to claim 3, wherein the non-metallic yarn (R) stores a waveform shape at the time of braiding in the sleeve-shaped braided body (B).
   
   

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