KR20160097552A - Cable with excellent flexibility and elasticity - Google Patents

Abstract

The present invention relates to a cable with excellent flexibility and elasticity and, more specifically, to a cable with excellent flexibility and elasticity required according to a usage environment as a cable for signal/control or a power cable used for a moving unit such as an automatic teller machine, a machine tool, an electronic device, an industrial robot, a transport robot, etc. performing repetitive movement.

Description

[0001] Cable with excellent flexibility and elasticity [

The present invention relates to a cable excellent in flexibility and bending resistance. Specifically, the present invention relates to a signal / control cable or a power cable for use in a moving object such as an automation device, a machine tool, an electronic device, an industrial robot, a conveying machine, and the like that performs repetitive movement, The invention relates to a cable having improved bendability at the same time.

A signal / control cable, a power cable, and the like used in a moving object such as an automation device, a machine tool, an electronic device, an industrial robot, and a conveying machine is required to have flexibility and flexibility in a long period of time due to repetitive movement of the moving object.

BACKGROUND ART Conventional cables used in mobile bodies such as automation devices have a structure in which an outer sheath is formed at the outermost periphery after a plurality of conductors including a conductor and an insulator that surrounds the conductor are associated with each other along the width of the tape.

Polyethylene terephthalate (PET) tapes suitable for use in cables are generally used because the tapes are excellent in initial adhesion and are advantageous not only in the transverse direction of cooperating wires but also in heat resistance, rigidity and electrical properties. However, Flexibility of the cable excessively decreases due to the transverse position of the PET tape, and repetitive bending due to repetitive movement of a moving object such as an automation device may be difficult.

Further, as the flexibility of the cable excessively deteriorates, an excessive warpage or tension is applied to the cable when the cable is flexed due to repetitive movement of a moving object such as an automation device, so that the cable is broken, There is a problem that flexibility is lowered.

Therefore, the present invention provides a signal / control cable or a power cable for use in a moving object such as an automation device, a machine tool, an electronic device, an industrial robot, and a conveying machine. The signal / control cable or the power cable is excellent in flexibility to facilitate repetitive bending due to repeated movement of the moving object, A cable excellent in long-term flex resistance is desperately required so as not to be damaged.

Provided is a signal / control cable or a power cable used for a moving object such as an automation device, a machine tool, an electronic device, an industrial robot, a conveying machine, etc., and has improved flexibility for facilitating repeated bending due to repeated movement of the moving object .

It is another object of the present invention to provide a cable having improved long-term bendability so that it is not damaged even when the cable is repeatedly bent due to repetitive movement of a moving object such as an automation device.

In order to solve the above problems,

At least one lead comprising a conductor and an insulator surrounding the conductor; A tape transverse to said at least one wire to couple said at least one wire; And an outer sheath surrounding the tape, wherein the elastic modulus of the tape is 400 MPa or less.

Wherein the adjacent tapes partially overlap each other in the transverse direction of the tape and the ratio of the width of the overlapped portion to the entire width of the tape is less than 1/2 and less than 1/2.

Further, the cable is characterized in that the width of the tape is 20 to 50 mm.

And the width of the tape is 20 to 30 mm.

On the other hand, a cable is provided, wherein the tape is a nylon tape.

Further, the present invention provides a cable characterized in that the conductor is a twisted wire obtained by twisting a plurality of single wires.

Further comprising an inner sheath on the underside of the tape, wherein the opening is filled in the void space between the one or more leads and the inner sheath.

And wherein the insulator comprises an ethylene tetrafluoroethylene (ETFE) resin and the outer sheath comprises a thermoplastic polyurethane (TPU) resin.

A cable according to the present invention is a tape for combining one or more wires, and aims to provide a cable with improved flexibility by applying a new tape which does not deteriorate the flexibility of the cable unlike the conventional PET tape.

A cable according to the present invention aims to provide a cable with improved flexibility and long-term flexural resistance through precise control of the transverse wraps (LAP) ratio of tapes for joining one or more wires.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically shows a cross-section according to one embodiment of a cable according to the invention.
Figure 2 schematically shows a longitudinal section of the cable shown in Figure 1;
Fig. 3 is an enlarged view of the tape shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

Figure 1 schematically shows a cross section according to one embodiment of a cable according to the invention, Figure 2 schematically shows a longitudinal section of the cable shown in figure 1; 1 and 2, a cable according to the present invention includes at least one lead 100 including a conductor 110 and an insulator 120 surrounding it, a plurality of conductors 110 wound around the lead 110 to join the at least one lead 100, A tape 200 and an outer sheath 300 surrounding the tape 200.

The conductor 110 may be made of a conductive metal such as copper or aluminum, and may be made of copper. The conductor 110 may be a single wire or a twisted wire obtained by twisting a plurality of wires, for example, seven wires or twenty-one wires, and may be preferably twisted in terms of flexibility in comparison with a single wire. In addition, the diameter of the conductor 110 may be determined according to the rated voltage of the cable according to the present invention.

The insulating layer 120 may be formed by extrusion of an insulating composition. The insulating composition may include an electrically insulating polymer resin as a base resin and an additive for realizing functions according to the use of the cable. Since the polymer resin is mostly an electrically insulating material, the electrically insulating polymer resin is not particularly limited if it satisfies the basic physical properties required of the insulating layer of the cable.

The electrically insulating polymer resin may be selected from, for example, ethylene tetra fluoro ethylene (ETPE), fluorinated ethylene propylene copolymer (FEP), polytetrafluoroethylene (PTFE), poly A fluorine resin such as polyvinylidene fluoride (PVDF) resin, or a polyolefin resin such as polyethylene or polypropylene, preferably an ethylene tetrafluoroethylene (ETFE) resin.

When a polyolefin resin is used as the base resin, the insulating composition is preferably a polyolefin elastomer (POE) such as propylene-ethylene rubber (EPR), propylene-ethylene diene rubber (EPDM) Styrene-butadiene rubber (SBR) such as ethylene-butene-styrene copolymer, styrene-ethylene propylene-styrene copolymer, styrene-ethylene-ethylene propylene-styrene copolymer and styrene- And the like.

The polyolefin elastomer, the styrene butadiene rubber (SBR), the ethylene vinyl acetate (EVA) and the like (hereinafter, referred to as a 'polyolefin elastomer and the like') have flexibility, bendability, impact resistance, Cold resistance, heat resistance, and the like can be further improved.

The tape 200 transversely connects one or more, for example three, conductors 100 including the conductor 110 and the insulator 120 surrounding the conductor 110, 100) to perform the function of stabilizing the structure and the performance of the cable.

As the tape 200 according to the present invention, a tape made of a material having a modulus of elasticity of 400 MPa or less, for example, a nylon tape may be used. The nylon tape has a modulus of elasticity of about 393.73 MPa, which is about 89% lower than that of the conventional PET tape of about 3580.5 MPa, thereby greatly increasing the flexibility and improving the flexibility of the cable according to the present invention.

Fig. 3 is an enlarged view of the tape 200 shown in Fig.

As shown in FIG. 3, the tape 200 is traversed in a state in which adjacent tapes adjacent to each other in a horizontal direction for joining the at least one lead 100 are partially overlapped with each other, The ratio of the width of the overlapping portion (a + a ') to the width of the overlapping portion (a + a') / b may be less than 1/2.

If the wrap (LAP) ratio of the tape 200 is 1/5 or less, the flexibility of the cable according to the present invention is improved, but the long-time bending resistance is greatly reduced. On the other hand, The long-term bendability is improved but the flexibility can be greatly reduced.

Further, the width of the tape 200 may be, for example, 20 to 50 mm, preferably 20 to 30 mm. If the width of the tape 200 is less than 20 mm, the tape 200 may be broken or twisted due to the tensile force of the tape 200, whereas if the width is more than 50 mm, Can be greatly reduced.

The cable according to the present invention can be manufactured by combining one or more wires 100 constituting the cable according to the present invention so that the quality, the width, and the wrap (LAP) ratio of the tape 200 for the purpose of structural stability of the cable, With precise control, it exerts an excellent effect of simultaneously improving the flexibility of the cable in the trade-off and the flex resistance in the long term.

In the present invention, the outer sheath 300 functions to protect the cable from external impact and pressure. The outer sheath 300 may be formed of a thermoplastic polyurethane (TPU), a polyvinylchloride (PVC), a polychloroprene rubber (CR), a chlorosulfonated polyethylene (CSPE), chlorinated polyethylene (CPE), ethylene vinyl acetate (EVA), fluorinated ethylene propylene copolymer (FEP), polytetrafluoroethylene (PTFE), polytetrafluoroethylene Polyvinylidene fluoride (PVDF) resin, or a mixture thereof, preferably in the form of an extruded layer of thermoplastic polyurethane (TPU).

The cable according to the present invention may further include an inner sheath 400 below the tape 200 and the inner sheath 400 may be made of the same or different material as the outer sheath 300. Meanwhile, the cable according to the present invention can be more structurally stabilized and more secure from external shocks by filling the void space between the at least one lead 100 and the tape 200 or the inner sheath 400 .

[Example]

1. Manufacturing Example

Three conductors on which an insulator made of ethylene tetrafluoroethylene (ETFE) resin as a base resin was formed on the conductors of 1.5 SQ were joined together by transversely wrapping the materials and width tapes shown in Table 1 below at the wrap (LAP) An inner sheath made of urethane and an outer sheath were formed to prepare a cable specimen according to each of Examples and Comparative Examples.

material Width (mm) Lap (LAP) rate Example 1 Nylon tape 20 1/3 Example 2 Nylon tape 25 1/3 Example 3 Nylon tape 30 1/3 Example 4 Nylon tape 30 1/4 Example 5 Nylon tape 35 1/3 Example 6 Nylon tape 40 1/3 Example 7 Nylon tape 45 1/3 Example 8 Nylon tape 50 1/3 Comparative Example 1 PET tape 30 1/3 Comparative Example 2 Glass tape 30 1/3 Comparative Example 3 Nylon tape 55 1/3 Comparative Example 4 Nylon tape 30 1/2 Comparative Example 5 Nylon tape 30 1/5

2. Property evaluation

(1) Flexibility evaluation

Flexibility was evaluated by measuring the bending radius (radius of curvature), which is the radius of the bending portion at the time of maximum bending of the cable according to each of the examples and the comparative examples. When the bending radius was 7D or more, it was evaluated that the flexibility was poor.

(2) Evaluation of long-term bendability

When the flexure according to IEC 60754-1-2 E6 was performed 10,000 times, the flexural strength of the cable specimen was evaluated based on whether the flexure area was damaged.

Bending strength (D) Long-term bending resistance evaluation (10,000 times) Example 1 5.33 Good Example 2 5.54 Good Example 3 5.8 Good Example 4 5.51 Good Example 5 6.22 Good Example 6 6.36 Good Example 7 6.63 Good Example 8 6.87 Good Comparative Example 1 7.3 Bad Comparative Example 2 7.1 Bad Comparative Example 3 7.05 Good Comparative Example 4 7.13 Good Comparative Example 5 5.36 Bad

As shown in Table 2, the cable specimens of Comparative Examples 1 and 2 were found to have significantly reduced flexibility due to the flexural strength of the cable being 7D or more because the tape for joining the conductors was a PET tape or a glass tape with excessive elasticity , And the cable specimen of Comparative Example 3 was found to have a high flexural strength in the long term due to excessive tape width, while the flexural strength was 7D or more, resulting in a significant decrease in flexibility.

In addition, the cable specimen of Comparative Example 4 was found to have an excessively long wrap (LAP) ratio in the longitudinal direction of the tape, good flexibility in the long term, and a flexural strength of 7D or more, (LAP) ratio was low, indicating that the flexibility was good but the long - term flexural resistance was greatly degraded.

On the other hand, it was confirmed that the specimens of Examples 1 to 8 according to the present invention had flexural strength of less than 7D, excellent flexibility, and excellent flexural flexibility in relation to the flexibility.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: lead wire 200: tape
300: outer sheath 400: inner sheath
500: Established

Claims (8)

At least one lead comprising a conductor and an insulator surrounding the conductor;
A tape transverse to said at least one wire to couple said at least one wire; And
And an outer sheath surrounding the tape,
Wherein the elastic modulus of the tape is 400 MPa or less. The method according to claim 1,
Adjacent tapes in the transverse direction of the tape partly overlap each other,
Characterized in that the ratio of the width of the overlapped portion to the total width of the tape is less than 1/2 and less than 1/2. 3. The method according to claim 1 or 2,
Wherein the tape has a width of 20 to 50 mm. The method of claim 3,
Characterized in that the width of the tape is 20 to 30 mm. 3. The method according to claim 1 or 2,
Characterized in that the tape is a nylon tape. 3. The method according to claim 1 or 2,
Wherein the conductor is a twisted wire obtained by twisting a plurality of single wires. 3. The method according to claim 1 or 2,
Further comprising an inner sheath under the tape,
Characterized in that an opening is filled in an empty space between said at least one lead and said inner sheath. 3. The method according to claim 1 or 2,
Wherein the insulator comprises an ethylene tetrafluoroethylene (ETFE) resin,
Characterized in that the outer sheath comprises a thermoplastic polyurethane (TPU) resin.

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