JPH05290659A - Cloth adhesive tape for bundling electric wire bundle - Google Patents

Abstract

PURPOSE:To keep a well manual cutting characteristic and a stable bundled state even if tension is applied to a winding adhesive tape when a bundled electric wire is bent by using a fabric tape having an extension ratio and a strength ratio between wefts and warps more than a predetermined value, respectively, under a specific condition of the fabric tape. CONSTITUTION:A ratio (a)/(b) is set at 1.2 or more and preferably at 1.25-3.0, wherein (a) represents strength of wefts 12 which are punched by the number suitable for a unit length of a fabric tape 1; and (b), strength of warps 11 which are punched by the number suitable for a unit width of the tape 1. A ratio (a)/(b) is set at 1.5 or more and preferably at 1.7-3.0, wherein (a) represents strength per one weft 12; and (b), strength per one warp 11. An extension ratio of the tape 1 at 45 deg. with respect to the warp is 20% or more and preferably 30-100%. Use of the tape 1 can prevent the cut position of the warp from being shifted as manual cutting work proceeds and avoid any slant split. Additionally, it is possible to absorb tension force acting on an adhesive tape winding layer when a bundled electric wire is bent, thus stably keeping a bundled state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape for binding a wire bundle, which is used for binding wire harnesses and bundled wires.

[0002]

2. Description of the Related Art In wire harness and the like, an adhesive tape is used for binding electric wires. Conventionally, a polyvinyl chloride adhesive tape having a polyvinyl chloride tape as a supporting base material has been used for this adhesive tape. However, in recent years, in automobiles, particularly passenger cars, it has been required to reduce noises (hereinafter referred to as friction noises) such as tapping noises and frictional noises generated from the wire harness, and the above polyvinyl chloride adhesive tape is used. Since friction noise peculiar to plastics is generated, improvement of the adhesive tape for binding electric wires is required.

Therefore, it has been proposed to use an adhesive tape having a woven fabric tape as a supporting substrate for binding wire harnesses. In this case, the polyvinyl chloride adhesive tape is cut off by hand. In order to maintain the property, it is attempted to use a woven fabric tape in which the strength of the weft yarns per unit length of the woven fabric tape is sufficiently higher than the strength of the warp yarns per unit length of the woven fabric tape. Has been.

[0004]

However, in a bundled electric wire such as a wire harness, a large number of electric wires are bundled by spiral winding of an adhesive tape and then bent by a considerably small bending diameter. In this case, the spirally wound adhesive tape layer is subjected to tensile strain on the bending tensile side of the bundled electric wire, so that tensile stress is generated at this portion, and the woven tape is supported on the supporting substrate. In the adhesive tape, the warp threads of the woven tape bear this stress.

However, in the adhesive tape using the woven tape as a supporting substrate, the number of warp threads or weft threads to be driven, the strength of the warp threads, the weft thread and the like are set only from the viewpoint of improving the hand-cutting property. If set, an excessive tensile stress is generated in the woven tape along with the bending of the bundled electric wire, which causes a problem such as peeling off of the adhesive surface at the winding tape end.

It is an object of the present invention to make not only hand-cutability but also hand-cutability when the supporting base material of the adhesive tape for binding electric wires is made of woven fabric in order to reduce friction noise in the wire harness. Bundled adhesive tape for wire bundles that can maintain a stable bundled state when the wrapped adhesive tape is pulled when the bundled wires are bent
To provide

[0007]

A cloth adhesive tape for binding an electric wire bundle according to the present invention is an adhesive tape in which an adhesive is provided on a woven cloth tape, per unit length of the woven cloth tape. The ratio a / b of the strength a of the driven weft yarn to the strength b of the warp yarn driven per unit width of the woven tape is 1.2 or more, and the strength a'of one weft yarn and the strength b'of one warp yarn are The ratio a '/ b' of 1.5 or more,
Woven tape - 45 ⁰ direction elongation for warp-flop 20%
The woven fabric tape described above is used.

[0008]

[Action] woven tape - so 45 ⁰ direction elongation for warp-flop is 20% or more, the cohesive tape - flexion cohesion the bundle wires at winding of flops, the adhesive tape - flop wound layer The pulling force acting on can be well absorbed, and the bound state can be stably maintained.

Further, the ratio a / b of the strength a of the driven weft yarn per unit length of the woven fabric tape to the strength b of the driven warp yarn per unit width of the woven fabric tape is set to 1.2 or more. Since the strength a is set sufficiently higher than the strength b of the warp thread, good hand-cutting performance can be guaranteed, and the strength b'per warp thread is sufficient as compared with the strength a'per weft thread. Since the height is set to a low value, it is possible to prevent the warp cutting position from being displaced with the progress of hand-cutting, and to avoid oblique tearing.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective explanatory view showing an embodiment of the present invention. In FIG. 1, 1 is a woven tape, 11, ... Is a warp yarn, and 12 is a weft yarn. Reference numeral 2 is an adhesive layer coated on one side of the woven tape 1.

In the above description, when the strength of the number of weft threads struck by the unit length of the woven tape is a and the strength of the number of warp threads struck by the unit width of the woven tape is b, the ratio a /
When b is 1.2 or more, preferably 1.25 to 3.0, and the strength per weft is a'and the strength per warp is b ', the ratio a' / b 'is It is set to 1.5 or more, preferably 1.7 to 3.0. Furthermore, woven fabric
The elongation in the 45 ⁰ direction with respect to the warp yarn is 20% or more, preferably 30 to 100%.

[0012] In the above-mentioned adhesive tape for binding electric wire bundles, it is wound around a winding core and handled. In order to bind the electric wires using the above wire bundle binding cloth adhesive tape, a plurality of electric wires are gathered, and the wire bundle binding cloth adhesive tape is spirally wound on it. The winding end of the tape is cut by manual tearing. In this case, the strength a of the driven weft yarns of the same width (for example, per inch) is sufficiently larger than the strength b of the driven warp yarns.
It is possible to easily cut and cut the winding terminal by hand.

If the strength of each warp yarn is high, the warp cutting position is displaced and an oblique tear is apt to occur as the above-mentioned tearing progresses. However, in the above-mentioned wire bundle binding cloth adhesive tape, one weft yarn is used. Since the ratio a '/ b' of the strength per hit to a'and the strength per warp yarn to b'is 1.5 or more, the strength b'per warp yarn is made sufficiently small. The tear can be eliminated and it can be cut with an orderly cutting line.

When the electric wire bundle bound by the spiral winding of the cloth adhesive tape for binding the electric wire bundle is bent, the spiral winding tape layer has a bending strain corresponding to the bending strain on the bending pull side of the electric wire bundle. A tensile strain acts, and the direction of this tensile strain is a direction inclined by the winding angle of the spiral winding with respect to the warp yarn of the woven tape.

The cloth adhesive tape for binding the electric wire bundle of the present invention
In the tape, the elongation rate of the woven tape in the 45 ⁰ direction with respect to the warp yarn is 20% or more, and the tape winding average angle is 45 ⁰ (the minimum winding angle is 0 ⁰ in the wire length direction). There, the maximum winding angle is woven in the direction of 90 ⁰ of the wire circumferential direction) Te - because are sufficiently high elongation of the flop, can sufficiently absorb the tensile strain caused by the bending, adhesive tape - The effect of excessive tensile stress in the tape can be eliminated, and peeling at the winding end of the cloth adhesive tape for binding the electric wire bundle can be well avoided.

In the above, the strength per warp yarn is
It is desirable that the tension is about 170 g / piece or more, preferably 180 to 350 g / piece, in view of the winding tension of the tape. Therefore,
The strength per weft thread is 250 g / thread or more, preferably 2
It is desirable to set 70 to 500 g / piece.

Further, the size of the mesh of the woven fabric is 0.1 to 0.6 m in terms of holding the pressure-sensitive adhesive so that the length of the shorter length or width is 0.1 m.
It is preferable that the length is m, and the length of both the vertical and the horizontal is 0.7 mm or less.

Further, if the thickness of the above-mentioned pressure-sensitive adhesive coating is too thick, the pressure-sensitive adhesive will easily leak out from the pressure-sensitive adhesive tape winding layer. Therefore, the thickness of the woven fabric may be 80% or less. Preferably, it is usually 50 to 160 μm.

Further, as the pressure-sensitive adhesive, a viscosity-adjusted one is used in order to prevent dripping at a high temperature and to prevent outflow after a long time at room temperature. For example, the viscosity at 100 ° C.
It is preferable that the shear rate is 500 poise or more at a shear rate of 1/500 seconds, and the ratio to the viscosity at a shear rate of 1/5 seconds is 5 or more.

According to the present invention, even with an adhesive tape using a woven cloth tape as a supporting substrate, the electric wire has excellent workability due to the excellent hand-cutability of the woven cloth tape. Can be united. Also, due to the excellent stretchability of the woven tape in the oblique direction, even when the bundled electric wire is bent, the bending strain can be well absorbed by the stretchability of the woven tape. Peeling can be prevented and a stable bound state can be maintained.

These effects can be confirmed by comparing the following Examples and Comparative Examples. The same pressure sensitive adhesive was used, and the thickness of the pressure sensitive adhesive layer was 50% of the thickness of the woven fabric.

Example 1 A cotton yarn 40 count was used as the warp yarn, and the number of warp yarns (1
The number of hammer-ins per inch, the same below) is 51,
Use the 20th count cotton thread as the weft thread, and set the number of weft threads (1
A woven fabric was used in which the number of hammered-in pieces per inch (the same applies hereinafter) was 37. The strength a of the driven weft yarn per inch of this woven tape is 5.0 kg, and the strength of the woven tape is 1 kg.
The strength b of the driven warp yarn per inch width is 3.6 kg, and the ratio a / b thereof is 1.4. Further, the ratio a '/ b' of the strength a'per weft thread and the strength b'per warp thread.
Is about 2.0. Furthermore, 4 for the warp of the woven tape
5 ⁰ direction elongation is 40% or more. The size of the mesh of the woven cloth is 0.4 mm × 0.5 mm.

Example 2 The number of warp threads is 4 and the number of warp threads is 4
A woven fabric was used in which the number of yarns was 0, the number of weft yarns was 34, and the number of weft yarns was 34. The strength a of the driven weft yarn per inch of this woven tape is 4.6 k.
g, the strength b of the warp warp yarn per inch of the woven tape is 3.8 kg, and the ratio a / b is 1.2.
The ratio a '/ b' between the strength a'per weft thread and the strength b'per warp thread is about 1.5. Furthermore, woven tape - 45 ⁰ direction elongation for warp-flop is 40% or more. The size of the mesh of the woven fabric is 0.5 mm × 0.
It is 6 mm.

Example 3 A woven fabric in which 50 denier acetate yarns were used as warp threads, the number of warp threads was 100, the number of weft threads was 20 and the number of weft threads was 37. It was used. The strength a of the weft thread driven in per inch of the woven tape was 5.0 kg, and the strength b of the warp thread driven in per inch of the woven tape was 2.5 kg, and the ratio a /
b is 2.0. The ratio a '/ b' of the strength a'per weft thread to the strength b'per warp thread is about 5.3. Furthermore, woven tape - 45 ⁰ direction elongation for warp-flop is 30% or more. The size of the woven cloth is
It is 0.2 mm × 0.5 mm.

COMPARATIVE EXAMPLE 1 Cotton 40 count was used as the warp and the number of warp threads was set to 3
A woven fabric was used in which the number of yarns was 7, the number of weft yarns was 51, and the number of weft yarns was 40. The strength a of the driven weft thread per inch of this woven tape is 5.0 k.
g, the strength b of the warp warp-driving per 1-inch width of the woven tape is 3.6 kg, and the ratio a / b thereof is 1.4.
Further, the ratio a '/ b' between the strength a'per weft thread and the strength b'per warp thread is about 1.0. Further, the elongation of the woven tape in the 45 ⁰ direction with respect to the warp yarn is about 39%. The size of the woven cloth is 0.6 mm x 0.4
mm.

COMPARATIVE EXAMPLE 2 A cotton yarn 36 count was used as the warp and the number of warp threads was 5
A woven fabric was used in which the number of the weft yarns was 0, the number of weft yarns was 60, and the number of weft yarns was 30. The strength a of the driven weft yarn per inch of this woven tape is 4.7 k.
g, the strength b of the warp warp-in per 1 inch width of the woven tape is 3.9 kg, and the ratio a / b is 1.2.
Further, the ratio a '/ b' between the strength a'per weft thread and the strength b'per warp thread is about 1.0. Furthermore, the elongation of the woven tape in the 45 ⁰ direction with respect to the warp yarn is about 40%. The size of the woven cloth is 0.4 mm × 0.3
mm.

Comparative Example 3 Woven fabric in which 20 denier acetate yarns were used as warp threads, the number of warp threads was 250, the number of weft threads was 20 and the number of weft threads was 37. It was used. The strength a of the weft thread driven in per inch of the woven tape was 5.0 kg, and the strength b of the warp thread driven in per inch of the woven tape was 2.5 kg, and the ratio a /
b is 2.0. The ratio a '/ b' of the strength a'per weft thread to the strength b'per warp thread is about 13. Furthermore, the elongation of the woven tape in the 45 ⁰ direction with respect to the warp is about 18%. The size of the woven cloth is
It is 0.1 mm × 0.5 mm.

Regarding these example products and comparative example products,
Hand-cutability and peeling of the tape winding terminal (wound spirally on the wire bundle, bend the wire bundle at a bending strain of 30% and check for peeling of the tape winding terminal) were tested. In each of the example products, hand tearability was good, and peeling of the winding terminal was not observed.

On the other hand, in Comparative Example Product 1, diagonal tearing occurred, and in Comparative Example Product 2, vertical tearing occurred. Further, in Comparative Example 3, the hand-cutting property was almost good, but peeling of the wound terminal was observed.

[0030]

As described above, according to the adhesive tape for binding electric wires of the present invention, even if the supporting base material of the adhesive tape for binding electric wires is made of woven cloth, the tape can be cut off by hand. The sticking property of the winding terminal can be well ensured, and the reduction of the friction noise can be achieved while the binding workability such as wire harness and the binding stability are well maintained.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Woven fabric 11 Warp yarn 12 Weft yarn 2 Adhesive

Claims (2)

[Claims] 1. A pressure-sensitive adhesive tape comprising a woven cloth tape provided with an adhesive agent, wherein the strength a of the weft thread driven in per unit length of the woven cloth tape and the warp warp thread per unit width of the woven cloth tape The ratio a / b with the strength b is 1.2 or more, the ratio a '/ b' with the strength a'per weft yarn and the strength b'per warp yarn is 1.5 or more, and the woven tape woven tape 45 ⁰ direction elongation against warp is 20% or more - wire bundle tie fabric adhesive tape is characterized in that using up - flop. 2. The cloth adhesive tape for binding an electric wire bundle according to claim 1, wherein the strength b'per warp yarn is 170 g or more.