KR100971595B1 - High strength foam cable for ship - Google Patents

Abstract

The present invention relates to a cable for a ship, comprising: a conductor wire assembly unit comprising a conductor wire consisting of a center conductor and an insulator covering the center conductor; A binding tape surrounding the conductor wire assembly; An inner sheath provided to surround the binding tape; And an outer sheath provided on the outermost side of the cable to protect the cable, and any one or two or more selected from the insulator, the inner sheath and the outer sheath are made of foam.

Marine cable, foam, metal braiding, PVC, sheath, matrix, foam extrusion

Description

High Strength Foam Cable for Ships {HIGH STRENGTH FOAM CABLE FOR SHIP}

The present invention relates to a cable for ships, and more particularly to a high-strength foam cable for ships to improve the impact resistance by improving the sheath material and the filling structure of the cable.

It is important that ship cables used to supply power or control signals from ships have flame retardancy and impact resistance to minimize damage caused by shipboard disasters such as fire that may occur during navigation.

Conventional ship cable is composed of a conductor wire 10 consisting of a center conductor (10a) and an insulator (10b), a filler (11) filled outside the conductor wire 10, as shown in FIG. A binding tape 12 surrounding the outside of the conductor wire 10, an inner sheath (or bedding) 13 provided outside the binding tape 12 to protect the cable, and a metal braided layer 14. And an outer sheath 15. Patents related to marine cables having such a structure include Korean Patent Registration No. 384130 (high flame retardant low-flammable marine cable and its system composition), which is filed and filed by the present applicant.

In the conventional ship cable, the metal braided layer 14 is provided in a structure braided by metal such as copper, aluminum, iron, etc., and is disposed between the inner sheath 13 and the outer sheath 15 so as to surround the inner sheath 13. Interposed to protect cables from external shocks.

However, in the prior art, a method of simply designing a thicker sheath thickness was used to improve tensile strength in manufacturing a cable for a ship, which is not only easy to manufacture a small cable, but also consumes a lot of sheath material and increases the tensile strength of the cable. There was a problem that excessively imparted and difficulty in handling the cable.

In addition, the conventional ship cable is manufactured in a form filled with a high-density filler therein, according to this configuration is difficult to configure the unit of the conductor wire and the sheath and easy to dismantle work due to the high-strength filler in the cable stripping process for cable connection. There is a vulnerability that is not.

The present invention has been made to solve the above problems, the object is to provide a high-strength foam cable for ships by reducing the cable outer diameter or sheath thickness and imparting impact resistance to the cable by configuring the sheath of the cable using a foam. .

Another object of the present invention to provide a high-strength foam cable for ships having a structure in which the internal filling is formed by using a foam to provide a convenience of the cable connection operation.

In order to achieve the above object, the present invention discloses a high-strength foam cable for ships in which the insulator, the filler, the inner sheath, the outer sheath, etc., which cover the center conductor are made of foam.

That is, the ship's high-strength foam cable according to the present invention includes a conductor wire assembly unit in which a conductor line consisting of a center conductor and an insulator covering the center conductor is assembled; A binding tape surrounding the conductor wire assembly; An inner sheath provided to surround the binding tape; And an outer sheath provided on the outermost side of the cable to protect the cable, wherein any one or two or more selected from the insulator, the inner sheath, and the outer sheath are made of foam.

The foam preferably has a structure in which the particles are evenly dispersed in the size of the micrometer (μm) or nanometer (nm) by adding an additive to the polymer substrate matrix.

It is preferable that a reinforcing member interposed between the inner sheath and the outer sheath to reinforce the strength of the cable. Preferably, the reinforcing member may be configured in the form of a metal braid or reinforcing tape surrounding the inner sheath.

The insulator is preferably made of any one selected from fluorine rubber, silicone rubber, natural rubber and EPR (ethylene propylene rubber).

The inner sheath or outer sheath is preferably made of any one or two or more selected from polyurethane (PU), polystyrene (PS), polyolefin (PO), polyvinyl chloride (PVC) and polycarbonate (PC).

Preferably, a foam filler is filled between the conductor wire assembly and the binding tape. At this time, the foam filling is preferably made of EPDM (ethylene-propylene-diene-based synthetic rubber).

According to the present invention, as the sheath or filler is composed of a foam having pores having a size of micrometer (μm) or nanometer (nm), the outer diameter and the sheath thickness of the cable can be reduced, and the external impact is prevented by the pores. Since it can be absorbed there is an advantage to improve the impact resistance.

In particular, according to the present invention, since the elongation rate can be improved compared to the same size as the existing ship cable, even if manufactured with a small cable, it is possible to sufficiently absorb external impact and maintain the appropriate strength required for the ship.

In addition, since the inner filling is made of micro / nano foam, the cable can be easily dismantled, thereby providing convenience of the cable connection work.

The present invention having the above advantages is free to design the cable by adjusting the porosity during the foaming process and can be used as a cable for supplying power, communication, control signals, etc. in the ship because it can increase the energy absorbing energy to suit the vessel. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Figure 2 shows the configuration of a high strength foam cable for ships according to a preferred embodiment of the present invention.

Referring to Figure 2, a high-strength foam cable for ships according to a preferred embodiment of the present invention, the conductor line assembly 101, the foam filling 102, the binding tape 103, the inside of the foam while going from the inside to the outside The sheath 104, the reinforcing member 105, and the foam outer sheath 106 have a structure formed sequentially.

The conductor line assembly 101 has a form in which a predetermined number of conductor lines 100 including a center conductor 100a extending in the longitudinal direction of a cable and an insulator 100b covering the cable are assembled in an associated structure.

The inner sheath 104 and the outer sheath 106 including the insulator 100b are formed into a foam structure by a foaming process. In the foaming process, an additive is added to a polymer matrix based on a mixed solvent to form a phase in which particles are dispersed in a size of micrometer (μm) or nanometer (nm), and then foamed and extruded. do. According to this foaming process it is possible to evenly disperse the particles can be easily formed cable composite and improve the impact resistance.

3 (a) shows a schematic shape of a micrometer (μm) level foam, and FIG. 3 (b) shows a schematic shape of a nanometer (nm) level foam. 4 shows a cross-section of an actual foam sheath 200 provided by the foaming process and used as the insulator 100b or inner sheath 104 and outer sheath 106.

As the material of the insulator 100b, fluorine rubber, silicone rubber, natural rubber or EPR (ethylene propylene rubber) is employed.

Fill 102 is provided to be filled to the outside of the conductor wire assembly 101 to maintain the associated structure of the conductor wires 100 to provide a cushioning function. Fill 102 is formed into a foam structure by a foaming process as described above. Here, it is preferable that EPDM (ethylene-propylene-diene-based synthetic rubber) is employed as the material of the filler 102.

The binding tape 103 laterally wraps the conductor wire assembly unit 101 to tightly bind the conductor wires 100 to each other.

The inner sheath 104 is provided to surround the binding tape 103 and protects the conductor wire assembly 101 therein by absorbing an external impact through the foam structure. The inner sheath 104 is formed by foaming a mixture containing polyvinyl chloride (PVC) or polyvinyl chloride (PVC) having a relatively high impact resistance among polymer materials. Alternatively, the inner sheath 104 may be formed by foaming polyurethane (PU), polystyrene (PS), polyolefin (PO), polycarbonate (PC) and the like.

The outer sheath 106 is provided on the outermost side of the cable to protect the cable from external impact or corrosion. The outer sheath 106 is formed by foaming a mixture containing polyvinyl chloride (PVC) or polyvinyl chloride (PVC) having a high impact resistance as in the inner sheath 104, and in addition, polyurethane (PU) and polystyrene ( PS), polyolefin (PO), polycarbonate (PC) or the like may be formed by foaming.

The reinforcing member 105 is provided in the form of a metal braided layer or reinforcing tape interposed between the inner sheath 104 and the outer sheath 106 to surround the inner sheath 104 to reinforce the strength of the sheath.

5 is a table comparing the mechanical performance of the high-strength foam cable for ships according to a preferred embodiment of the present invention compared to the prior art. Figure 5 (a) shows the mechanical performance of a conventional marine cable with a metal braided layer, Figure 5 (b) shows the mechanical performance of a high strength foam cable for ships according to a preferred embodiment of the present invention. Elongation and tensile strength in Figure 5 was measured according to ASTM (American Society for Testing and Materials) standard D638.

Referring to FIG. 5, when the diameter D or the thickness T of the insulator 100b, the filler 102, the inner sheath 104, the outer sheath 106, and the like are designed in the same manner as in the prior art, It can be seen that the elongation can be improved.

In FIG. 5A, EPR (ethylene propylene rubber) was used as the material of the insulator, and polyvinyl chloride (PVC) was used as the material of the inner sheath 104 and the outer sheath 106. In Figure 5 (b) the insulator is composed of a foam of EPR (ethylene propylene rubber), the filling is composed of a foam of EPDM (ethylene-propylene-diene-based synthetic rubber), the inner sheath and the outer sheath polyvinyl chloride ( PVC) foam. In particular, polyvinyl chloride (PVC) foams composed of dispersed phases of micrometer (nm) or nanometer (nm) size increase the elongation to 250% by adding about 3% clay. You can.

FIG. 6 is a graph illustrating a result of measuring shock absorption energy (or impact strength) by performing an impact test on a ship cable specimen manufactured according to the design value shown in FIG. 5. 6 is a dashed energy curve for a conventional marine cable with a metal braided layer, a solid line graph is an impact energy curve for a high-strength foam cable for ships according to a preferred embodiment of the present invention. Here, the shock absorbing energy was measured according to ASTM standards E436 and D1852. Referring to Figure 6, the high-strength foam cable for ships according to a preferred embodiment of the present invention can be confirmed that the elongation is improved as described above to improve the absorption energy and strength of the cable against external impact.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The following drawings, which are attached to this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a cross-sectional view showing the configuration of a ship cable provided with a metal braided layer according to the prior art.

2 is a cross-sectional view showing the configuration of a high-strength foam cable for ships according to a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a schematic model of a foam having micrometer level and nanometer level size.

4 is a cross-sectional view of the foam sheath provided in the high-strength foam cable for ships according to a preferred embodiment of the present invention.

5 is a table comparing the mechanical performance of the high-strength foam cable for ships according to a preferred embodiment of the present invention compared to the prior art.

Figure 6 is a graph showing the impact test results for ship cable specimens manufactured according to the design value of FIG.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS

100: conductor wire 101: conductor wire assembly

102: Fill 103: Binding Tape

104: internal sheath 105: reinforcing member

106: external sheath

Claims (8)

delete delete delete delete delete delete delete A conductor wire assembly unit in which a conductor line including a center conductor and an insulator covering the center conductor is assembled; A binding tape surrounding the conductor wire assembly; Foam filling consisting of EPDM (ethylene-propylene-diene-based synthetic rubber) is filled between the conductor wire assembly and the binding tape, but made of foam; An inner sheath surrounding the binding tape; And An outer sheath provided on the outermost side of the cable to protect the cable; Any one or two or more selected from the insulator, the inner sheath and the outer sheath are made of foam, The foam is a high-strength foam cable for ships having a porosity of more than 50% by the structure in which the additive is added to the polymer substrate matrix dispersed particles.

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