JP2002339280A - Highly sheared cord and curl cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent highly sheared cord and curl cord simultaneously satisfying handleability and cut resistance. SOLUTION: This highly sheared cord is characterized by coating braid using a metallic rope composed of plural metallic wires and having 1-2 mm diameter as a core and using a synthetic fiber as a sheath with a resin. This curl cord is characterized by carrying out curl processing of the highly sheared cord.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-shear cord and a curl cord suitable for preventing theft of displayed products and the like.

[0002]

2. Description of the Related Art A conventional anti-theft cord has a diameter of 0.5 to 0.5 mm.
The end of the 0.8 mm stainless wire was rounded with metal fittings, and the main unit and the display shelf were connected with a wire and fixed with a key. Also,
What was coated with black PVC resin, which was inconspicuous, was used.

[0003] However, these wires can be easily cut with nippers or office scissors, which may be unnecessary, and there has been a strong demand for the development of a strong, flexible, and easy-to-handle wire cord.

Conventionally, there have been studies on a braid made of a piano wire or a high-strength fiber, but none of them have been capable of simultaneously satisfying the flexibility and the shear resistance of the blades.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to provide an excellent material which simultaneously satisfies handling and cutting resistance.

[0006]

The present invention employs the following means in order to solve the above problems. That is, the high shear cord of the present invention is characterized in that a braid having a synthetic fiber as a sheath is resin-coated with a metal rope having a diameter of 1 to 2 mm constituted by a plurality of metal wires as a core. It is. Further, the curled cord of the present invention is obtained by curling such a high shear cord.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention has been studied diligently for excellent cords which simultaneously satisfy the above-mentioned problems, namely, handleability and shear resistance. When a synthetic fiber was used as a braid and its surface was coated with a resin, it was found that such a problem could be solved at once.

That is, by such means, the cutting ability of a knife or the like can be remarkably improved without deteriorating the handleability.

The thickness of the metal rope formed of the metal strand of the present invention must be 1-2 mm in diameter. If it is too thin, it can be easily cut with scissors. As the metal element wire, stainless steel, plated wire, carbon steel, or the like is appropriately used. That is, a material that is hard, strong, and free from deformation and rust is preferable.

The metal rope has a diameter of 0.03 to 0.2.
Those composed of 49 to 133 strands in the range of mm are good. When the strand is thin, the cutability is reduced, and when the strand is thick, the flexibility is inferior. Therefore, as the most suitable one, 75 strands of 0.09 to 0.18 mm strands are preferably used because of their excellent balance.
The one composed of 75 strands is composed of 19 strands as cores, and eight sets of seven strands are twisted around the core with (1 × 19) + (7 × 8). ). In addition, a low-priced general (7 × 7), more flexible (7 × 19) twisted or the like is also preferably used.

However, the element wire is thinner (7 × 7) + (8
× 19) = 201 wires or more is not preferable because the cutting strength with scissors decreases and the price increases significantly.

Next, as a structure in which the metal rope is more flexible, there is a flexible shaft in which a metal wire constituting a core is wound around a metal wire thicker than the metal wire of the core. This is a metal wire thicker than the core metal wire without gaps around the 7-49 metal wires, and the twist direction is S,
It is wound one or two times in the Z direction, and the cutting edge of the scissors slips when cutting is attempted, making it difficult to cut.

The thinner the core metal wire is, the more flexible it is preferable. Since the metal wire to be wound has a flexible structure, it is preferable to use a high-shear wire having a somewhat thick wire.
The number of turns may be one, but in order to further increase the number of turns, it may be wound twice in the direction opposite to the first turn. If the number of turns is more than necessary, the price is increased for the performance, which is not preferable.

Preferably, the diameter of the core metal wire of the flexible shaft is 0.01 to 0.15 mm, and the diameter of the winding around which the core is wound is 0.1 to 0.2 mm.

Next, the effect is further exhibited when the synthetic fiber is a high-strength fiber having a fiber strength of 20 cN / dtex or more in a braid having a synthetic fiber as a sheath at the core of the metal rope. In addition, by using a braid, the metal rope and the coating resin on the surface do not adhere to each other, and the high-strength fiber itself is also flexible and slippery, has excellent cuttability, and the combination of this and the hard metal rope causes high shear. It is.

As such high-strength fiber, any of high-strength polyethylene fiber, aramid fiber, high-strength polyvinyl alcohol fiber and the like can be employed, but para-aramid fiber is most preferably used because of its heat resistance and flame retardancy. You.

The total thickness of a braid having a metal cord as a core is 13,000 to 15,000 dte.
x is preferred.

By coating such a braid with a resin, a high-shear cord of the present invention can be produced. Such a resin processing is necessary for improving durability such as abrasion. Is essential to manufacture.

As a material for the resin coating, a thermoplastic resin is preferable, and at least one selected from a polyester resin, a PVC resin, a styrene resin, a polyamide resin, an olefin resin and a fluorine resin is used. be able to. Such a resin is selected from these simple substances or copolymers. Among them, a polyester resin composed of a copolymer of an amorphous phase component and a crystalline phase component is flexible, elastic, and strongest, and thus is used as an optimal resin.

The coating thickness of the resin coating is 1.0 to 1.5 m
m is preferred. If it is too thin, it will break easily, and if it is too thick, it will be hard and difficult to handle.

The high shear cord thus obtained is
The end may be looped with a metal fitting and connected to the product with a key, and if it is formed into a curled cord having a diameter of 1 to 3 cm, the handleability is further improved.

The high-shear cord is fixed to a product and used for anti-theft, so that it is not only easy to handle, but also seemingly thick, hard and highly resilient, so that it cannot be easily cut. Being able to see is also important. For this reason, it is preferable that the material is curled to make it compact to improve handling.

In order to improve the shape of the curled cord, both ends of the curled portion are used to extend straight in the length direction. However, a thick and hard cord is difficult to bend even by heat treatment. . Even if the thickness of the coating resin is increased, the heat fixation is not effective, and even if it is bent, it returns to the original U-shape.

Therefore, this problem can be solved by inserting a metal pipe into both ends of the curled portion and bending the pipe at a right angle. Aluminum or duralumin metal pipes are used.
Use a mm-thick one.

The thus obtained high-shear cord of the present invention cannot be easily cut with scissors or a knife even if it is cut with a knife. In addition, the use of the curl code further improves the handling.

Here, a method for evaluating the cutting performance will be briefly described.

The high shear cord is sandwiched between the deepest portions of a large pliers, and the grip portion of the pliers is moved at a speed of 1 cm / m by a compression tester.
Measure the maximum stress that compresses in and cuts the cord. In the case of scissors, evaluation was made based on the presence or absence of cutting with full strength with high-grade dressmaking scissors.

As a product using the high-shear cord, it can be used as a fixing cord for various high-grade electric appliances displayed in a home appliance store, a notebook computer at an office office, a word processor, and the like. In addition, as a special use, a baton and a hanging string of a handgun can be used. If a pistol is removed, it becomes a serious incident, requiring something that is difficult or time-consuming to cut with criminals' commonly used cutters, knives and scissors.

The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the structure of the high shear cord of the present invention. That is, it is a schematic view of a high-shear cord formed by coating a braid having a stainless wire rope 1 as a core and a high-strength synthetic fiber 2 as a sheath with a polyester resin 3.

FIG. 2 is a schematic diagram in which the high shear cord is a curl cord. The high-shear cord 4 is a schematic diagram in which aluminum pipes 6 are attached to both ends of a curl portion 5 and processed into an L-shape, and both ends of the cord are processed into a loop with a metal fitting 7 for attaching a key.

[0032]

EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples.

Example 1 With a round driving machine, a metal element wire diameter of 0.12 mm × 49 (7 × 7)
A stainless steel wire rope having a thickness of 1.1 mm, which is composed of fine wires, is provided in a core, and eight yarns having a fineness of 1650 dtex and a strength of 22 CN / dtex made of para-aramid fiber are supplied. processed.

Next, the braid was converted into a polyester resin ("Hytrel" manufactured by Toray DuPont) using an extruder machine.
(R)) was coated to a thickness of 1 mm to form a cord having a diameter of 3.7 mm.

Subsequently, this cord was heat-fixed at a temperature of 220 ° C. using a curl cord winding machine, and processed into a curl diameter of 18 mm and a curl length of 15 cm. Then, both ends were bent by heat and straight-processed, and the ends were molded to fix the loop, thereby obtaining a curl cord for preventing theft.

The curl cord thus obtained is
In the evaluation of cutting performance with pliers, a cutting force of 267 N was obtained. This cutting force could not be cut at all with a new NT cutter, and a high level of cutting force could not be easily cut with Western scissors and medium-sized pliers. In addition, it was excellent in flexibility and handleability.

Example 2 A 1.5 mm-thick carbon steel wire rope composed of 0.18 mm × 75 (19 + 7 × 8) thin metal wires was used in the same manner as in Example 1 to obtain a diameter of 3 mm. A curl cord of 0.8 mm was prepared. Straight processing at the end of the curled portion has a high rebound and is difficult to bend.
An aluminum pipe having a thickness of 1 mm and an inner diameter of 4 mm was inserted into the cord and bent at a right angle.

The curl code thus obtained is
A cutting force of 330 N was obtained in the evaluation of cutting performance with pliers. This cutting force was obtained not only with a new NT cutter but also with high quality Western scissors. In addition, a material which was excellent in handleability, had high resilience in the curled portion, and did not seem to be cut off seemingly was obtained.

EXAMPLE 3 Sixty 0.15 mm thick wires were aligned around a stainless wire cord of 0.8 mm thick and 49 wires, and the wire was singled in the S twist direction. Wound up. Furthermore, it is wound on it in the Z-twist direction in a single layer to a thickness of 1.5 mm.
A flexible shaft was obtained.

In the same manner as in Example 1, a cord having a diameter of 3.7 mm was prepared by processing a braid with para-aramid fiber using the flexible shaft as a core and coating with a polyester resin. The resulting cord had a pliers cutting force of 295N. This is the carbon steel wire
Although less than 5 mm, in actual shear evaluation using high-grade Western scissors, a piece that was not cut at all and was rich in flexibility was obtained.

COMPARATIVE EXAMPLE 1 Three piano wires having a thickness of 0.3 mm and having a thickness of 0.6 were prepared.
A metal wire having a diameter of 1 mm was inserted into the core, and a braid was processed with eight yarns having a fineness of 1650 dtex made of the para-aramid fiber of Example 1, followed by coating with a polyester resin, and a diameter of 3.5.
mm was created.

The finished cord did not have a perfect circle, had irregularities in the length direction, and had poor quality. Further, the cutting force of the pliers of the cord was as low as 176 N, so that even a cutter knife and office scissors were cut relatively easily and lacked flexibility.

Comparative Example 2 A stainless steel wire having a thickness of 1.5 mm and a structure of 49 wires was prepared.
A cord was obtained by coating the polyester resin of Example 1.
The cutting force of the pliers of the cord was 290N, which was a high level of cutting strength, but it was cut relatively easily with scissors, probably because the resin and wire were fixed together. In addition, the result was a lack of flexibility.

[0044]

According to the present invention, it is possible to provide a high-shear cord and a curl cord which are excellent in cut resistance, flexible and excellent in handling, and are useful for preventing theft of displayed products and the like.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a high shear cord of the present invention.

FIG. 2 is an example of a schematic view of a curl cord composed of a high shear cord.

[Explanation of symbols]

 1: Stainless steel wire rope 2: High-strength synthetic fiber 3: Polyester resin 4: High shear cord 5: Curled portion 6: Aluminum pipe 7: Metal fitting

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 3B153 AA07 AA26 AA33 AA45 AA46 CC13 CC14 CC16 CC21 CC23 CC31 CC52 CC53 EE02 FF50 GG01

Claims (13)

[Claims] A diameter of 1 to 2 constituted by a plurality of metal strands.
A high-shear cord characterized in that a braid made of synthetic fiber as a sheath is resin-coated with a metal rope of mm as a core. 2. The high-shear cord according to claim 1, wherein the metal strand is made of stainless steel or carbon steel. 3. The metal rope has a diameter of 0.03 to 0.2 mm.
The high-shear cord according to claim 1 or 2, wherein the cord comprises 49 to 133 metal wires in the range of (3). 4. The metal rope is formed by winding a single or double metal wire thicker than the metal wire of the core around 7 to 49 strands of the metal wire constituting the core. The high shear cord according to any one of claims 1 to 3, wherein the cord is a configured flexible shaft. 5. The flexible shaft according to claim 1, wherein a diameter of a metal wire constituting the core is 0.01 to 0.15 mm, and a diameter of a winding around which the core is wound is 0.1 to 0.2 mm. 5. The high shear cord according to 4. 6. The synthetic fiber has a fiber strength of 20 cN / dt.
The high-shear cord according to any one of claims 1 to 5, which is a high-strength fiber having at least ex. 7. The high shear cord according to claim 1, wherein said synthetic fiber is a para-aramid fiber. 8. The high shear cord according to claim 1, wherein said resin coating is made of a thermoplastic resin. 9. The thermoplastic resin is a polyester resin,
The high shear cord according to claim 8, wherein the cord is at least one selected from a vinyl chloride resin, a styrene resin, a polyamide resin, an olefin resin, and a fluorine resin. 10. The high shear cord according to claim 9, wherein said polyester resin is a copolymer comprising an amorphous phase component and a crystalline phase component. 11. The resin coating having a coating thickness of 1.0-1.
The high shear cord according to any one of claims 1, 8 to 10, which is 7 mm. 12. A curled cord obtained by curling the high shear cord according to any one of claims 1 to 11. 13. The curl cord according to claim 12, wherein both ends of the curl portion are straightened by bending both ends with a metal pipe.
Curl code described in.