JP6759437B2 - LAN compatible curl code and LAN compatible curl code with plug - Google Patents

Description

The present invention relates to a LAN-compatible curl cord and a LAN-compatible curl cord with a plug.

Conventionally, cables having a spiral shape (curl cords) have been proposed in various fields.
For example, Patent Document 1 discloses an example in which a spiral cable is applied to a "communication cable". Here, a spiral curl is formed near the connector at the end of the cable, and even if tension is applied to the cable by accidentally catching a foot on the cable, it will be applied to the joint of the connector or the straight part of the cable. The force is absorbed to prevent damage to the connector and disconnection of the straight portion (see paragraphs 0001, 0021, FIG. 1 and the like).

Patent Document 2 discloses an example in which a spiral cable is applied to "electrical connection between movable members (wiring material in an automobile)". Here, a stranded wire in which a plurality of strands are twisted is used as a conductor, and in particular, the outer diameter of the strands is controlled according to the elastic modulus of the metal material, and high elasticity is achieved while saving space. Trying to obtain (see paragraphs 0002, 0005, Examples).

Japanese Unexamined Patent Publication No. 11-53955 JP-A-2017-182950

Although the spiral cable is optimized and used according to its application field as described above, it is a product applied to a LAN compatible communication cable (LAN compatible curl code) and can be used as a communication cable. A LAN-compatible curl cord that satisfies both the electrical characteristics and the elasticity that can be used as a curl cord (the ability to expand when used and contract when not in use) has not yet been provided.
Therefore, a main object of the present invention is to provide a LAN-compatible curl cord having excellent elasticity while ensuring electrical characteristics.

According to the present invention, in order to solve the above problems,
A LAN-compatible curl code that has a spiral shape.
A pair of twisted wires with a pair of insulated wires twisted together,
A sheath that covers the periphery of the anti-twisted wire is provided.
The sheath is composed of a PVC resin composition containing a polyvinyl chloride resin as a main component, and the PVC resin composition contains a polyester resin.
Provided is a LAN-compatible curl cord characterized in that the curl inner diameter of the LAN-compatible curl cord is 2.3 times or more and less than 3.1 times the cord outer diameter.

According to the present invention, it is possible to provide a LAN-compatible curl cord having excellent elasticity while ensuring electrical characteristics.

It is a top view of the LAN-adaptive curl cord with a plug. It is sectional drawing of the LAN-corresponding curl code. It is a figure for demonstrating the manufacturing method of a LAN-corresponding curl cord over time. It is a figure which shows the outline of the curl cord hanging test.

Hereinafter, a LAN-compatible curl code according to a preferred embodiment of the present invention will be described.
In this specification, the lower limit value and the upper limit value are included in the numerical range with respect to the description of "~" indicating the numerical range.

FIG. 1 is a plan view of a LAN-compatible curl cord 60 with a plug.
As shown in FIG. 1, the LAN-compatible curl cord 60 with a plug is mainly composed of a LAN-compatible curl cord 10 having a spiral shape and a plug 62.
The LAN-compatible curl code 10 is a curl code obtained by spirally processing a communication cable compatible with a LAN (Local Area Network).
The plug 62 is attached to both ends of the LAN-compatible curl cord 10.
When using the LAN-compatible curl cord 60 with a plug, one plug 62 is connected to a PC (Personal Computer) and the other plug 62 is connected to a communication device.

FIG. 2 is a cross-sectional view of the LAN-compatible curl code 10.
As shown in FIG. 2, the LAN-compatible curl cord 10 is mainly composed of a cable core 2 and a sheath 4, and a sheath 4 is formed around the cable core 2.

The cable core 2 is configured by twisting a plurality of sets (here, 4 sets) of anti-twisted wires 1.
The cable core 2 may be composed of a single pair of stranded wires 1.
The paired wire 1 is composed of a pair of insulated wires 5 twisted together.

The insulated wire 5 is composed of a conductor 51 and an insulator 52.
The conductor 51 is a conductor made of a conductive metal formed by twisting a plurality of strands (not shown), and an annealed copper wire is preferably used as the strand. The conductor 51 may be composed of a single wire.
The outer peripheral surface of the wire may be covered with a plating layer (not shown) of any one of tin, nickel, and silver on the conductor 51. In this case, oxidation of the strands can be effectively prevented during the coating process of the insulator 52.
Here, the conductor 51 is composed of a plurality of annealed copper wires twisted together.
The outer diameter of the conductor 51 is 24 to 30 AWG (American Wire Gauge), preferably 28 AWG.

The outer circumference of the conductor 51 is covered with an insulator 52.
The insulator 52 is made of an insulating resin. The insulator 52 is formed by extruding an insulating resin from the die of the extruder so as to cover the conductor 51.
The insulating resin is preferably a polyethylene resin or a fluororesin, and more preferably a polyethylene resin.
As the polyethylene resin, for example, low density polyethylene (LDPE) or high density polyethylene (HDPE) can be used.
Examples of the fluororesin include fluoroethylene / propylene copolymer (FEP; tetrafluoroethylene / hexafluoropropylene copolymer), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), and polychlorotrifluoroethylene (PFA). PCTFE), polyvinylidene fluoride (PVDF), vinyl fluoride (PVF), ethylene / tetrafluoroethylene copolymer (ETFE), and ethylene / chlorotrifluoroethylene copolymer (ECTFE) can be used.
Among these fluororesins, it is preferable to use a tetrafluoroethylene / hexafluoropropylene copolymer (FEP) or a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA).
The thickness of the insulator 52 is preferably 0.09 mm or more and 0.13 mm or less.

The outer circumference of the cable core 2 is covered with a sheath 4.
The sheath 4 is a so-called outer cover and covers the periphery of the cable core 2.
The sheath 4 is composed of a PVC resin composition (PVC: Poly Vinyl Chloride) containing a polyvinyl chloride resin as a main component, and the PVC resin composition is extruded from a die of an extruder so as to cover the cable core 2. To.

As described above, the PVC resin composition is a resin composition containing a polyvinyl chloride resin as a main component, and the PVC resin composition contains a polyester resin. The phrase "mainly composed of a polyvinyl chloride resin" means that the content of the polyvinyl chloride resin is the highest among the contained substances constituting the PVC resin composition.
In the PVC resin composition, the content ratio (mass%) of the polyester-based resin with respect to the total content of the PVC resin composition is preferably 10 to 20% by mass, and more preferably 14 to 18% by mass.
As the polyester resin, for example, polyethylene terephthalate, polytriethylene terephthalate, polybutylene terephthalate and the like can be used. The polyester resin is preferably polybutylene terephthalate.
The PVC resin composition has excellent flexibility and imparts elasticity to the LAN-compatible curl cord 10.
The thickness of the sheath 4 is preferably 0.4 mm or more and 0.8 mm or less, and more preferably 0.5 mm or more and 0.7 mm or less.

In the above LAN-compatible curl code 10, the curl inner diameter A (see FIG. 1) is within the range of 2.3 times or more and less than 3.1 times the cord outer diameter B (see FIG. 2), preferably 2. It is within the range of 3 times or more and 2.6 times or less.
The cord outer diameter B is preferably 3.5 mm or more and 4.5 mm or less, and more preferably 3.7 mm or more and 4.1 mm or less.
For example, when the cord outer diameter B is 3.9 mm, the curl inner diameter A is within the range of 9.0 mm or more and less than 12 mm.

The outer circumference of the cable core 2 may be covered with a presser foot.
The presser foot is preferably composed of a polyester tape (polyester film), and the thickness of the polyester tape is preferably 10 μm or more and 50 μm or less. Since the polyester tape is harder than the non-woven fabric, the deformation of the LAN-compatible curl cord 10 can be effectively suppressed. When covering with a presser foot, it is preferable that the presser foot is wound (wrapped) by overlapping a part of the polyester tape on the outer circumference of the cable core 2. This makes it possible to prevent the flexibility of the LAN-compatible curl cord 10 from being reduced.

Next, a method of manufacturing the LAN-compatible curl cord 60 with a plug will be described.

FIG. 3 is a diagram for explaining a method of manufacturing the LAN-compatible curl code 10 over time.
First, as shown in FIG. 3A, a linear LAN cable 70 (a precursor of a LAN-compatible curl code 10) is prepared.
Specifically, a pair of insulated wires 5 are twisted to form a pair of twisted wires 1, and a plurality of sets of paired twisted wires 1 are twisted to form a cable core 2. Then, the PVC resin composition is extruded into the cable core 2 to form a sheath 4, and a linear LAN cable 70 is produced.

Then, as shown in FIG. 3B, a LAN cable 70 having a constant length is spirally wound around a linear mandrel 80 having a constant outer diameter, and held at 70 to 90 ° C. for 30 minutes to 2 hours. As the mandrel 80, a mandrel having an outer diameter of 2.3 times or more and less than 3.1 times the curl inner diameter A is used. The outer diameter of the mandrel 80 is directly reflected in the curl inner diameter A of the LAN-compatible curl code 10. When wrapping the mandrel, be careful not to twist the LAN cable 70.
Then, the LAN cable 70 is kept wound around the mandrel 80 and kept in a low temperature environment of −10 to 0 ° C. for 30 minutes to 2 hours for rapid cooling.

After that, the LAN cable 70 is released from the low temperature environment of −10 to 0 ° C. and removed from the mandrel 80 to obtain a spiral LAN cable 72 as shown in FIG. 3C.

Then, as shown in FIG. 3D, the spiral LAN cable 72 is wound around the mandrel 80 again while reversing the winding direction. The reason why the winding direction is reversed is that when the obtained LAN-compatible curl cord 10 is stretched, the restoring force that tries to return to the shape before stretching works strongly, and even if the LAN-compatible curl cord 10 is repeatedly expanded and contracted, it spirals. This is because it becomes easier to maintain the shape.

Finally, the LAN cable 72 after rewinding is removed from the mandrel 80, a LAN-compatible curl cord 10 is manufactured, and plugs 62 are attached to both ends thereof.
Regarding the attachment of the plug 62, the plugs may be attached to both ends of the LAN-compatible curl cord 10 after the processes of FIGS. 3A to 3D are performed as described above, or the plugs 62 may be attached to both ends of the linear LAN cable 70. 3A to 3D may be performed after the above is attached.

According to the LAN-compatible curl cord 10 described above, the sheath 4 is made of a constant PVC resin composition, and the curl inner diameter A is within a certain range of the cord outer diameter B, so that the electrical characteristics are excellent and the PVC resin. Since the composition contains a polyester resin, it has excellent elasticity (see Examples below).

(1) Preparation of sample (1.1) Samples 21 to 24
As a conductor, a plurality of annealed copper wires were twisted to form a stranded wire (28 AWG).
Then, high-density polyethylene was prepared as an insulating resin, extruded from the die of the extruder, and the periphery of the conductor was covered with an insulator to form an insulated wire.
The outer diameter of the insulated wire was 0.56 mm.

After that, two insulated wires were twisted to form a pair of twisted wires.
Here, four pairs of twisted wires having a twist pitch of 7 mm, 10 mm, 8 mm, and 11 mm were formed, and these four pairs of twisted wires were twisted so that the pitch was about 70 mm to form a cable core.

Then, a certain PVC resin composition was extruded from the die of the extruder, and the circumference of the cable core was covered with a sheath to obtain a linear LAN cable.
Table 1 shows the substances contained in the PVC resin composition and their content (% by mass).
The thickness of the sheath was 0.6 mm, and the outer diameter of the cable (outer diameter of the cord) was 3.9 mm.

Then, a LAN cable having a constant length was spirally wound around a linear mandrel having a constant outer diameter, and held at 80 ° C. for 1 hour.
Here, four types of mandrel having an outer diameter of 8 mm, 9 mm, 10 mm, and 12 mm were prepared and wound around these mandrel.
Then, the LAN cable was held around the mandrel for 2 hours in a low temperature environment of 0 ° C. and rapidly cooled.

Then, the LAN cable was released from the low temperature environment of 0 ° C. and removed from the mandrel to obtain a spiral LAN cable. The spiral LAN cable was wound around the mandrel again while reversing the winding direction. The LAN cable after rewinding was removed from the mandrel to obtain a LAN-compatible curl cord (total length of about 300 mm). After that, plugs were attached to both ends of the LAN-compatible curl cord.
Here, samples 21 to 24 were used according to the outer diameter (curl inner diameter) of the mandrel.
The specifications of samples 21 to 24 are shown in Table 2.

(1.2) Sample 30
I purchased a commercial product (LAN curl code KB-Y5CC-01BK manufactured by Sanwa Supply). This was used as sample 30 and analyzed.
The specifications of sample 30 are shown in Tables 2 and 3.

(2) Sample test and measurement (2.1) Patch code test Each sample was subjected to a patch code test in accordance with the test standard TIA Patch Cord Cat.5e. The test results are shown in Table 4. In Table 4, "n" indicates the number of samples.

(2.2) Curl cord expansion / contraction test A sample with a total length of about 300 mm is expanded to 900 mm, which is about three times as long, and then contracted to the original length, 100,000 times and 500,000 times. It was repeated several times.
The length of the sample before and after the expansion and contraction test was measured, the elongation rate was calculated, and the appearance was also observed. The results are shown in Table 5.
At the same time, a patch cord test based on the test standard TIA Patch Cord Cat.5e was also performed on the samples before and after the expansion and contraction test. The test results are shown in Table 6. In Table 6, "n" indicates the number of samples.

(2.3) Curl cord sagging test Each sample was gripped vertically and the degree of sagging under its own weight was tested (see FIG. 4). The test results are shown in Table 7.

(3) Summary As shown in Table 4, in the sample 21 having a curl inner diameter of 2.1 times the cord outer diameter and the sample 30 having a curl inner diameter of 1.5 times, the electrical characteristics remained uncertain. On the other hand, in the samples 22 to 24 in which the sheath was made of a PVC resin composition and the curl inner diameter was 2.3 times or more the cord outer diameter, a margin of 2.0 dB or more was secured and the electrical characteristics were good.
As shown in Table 5, even if the sheath was made of a PVC resin composition, the elongation rate was high in the sample 24 in which the curl inner diameter was 3.1 times the cord outer diameter and in the sample 30 in which the sheath was made of urethane resin. On the other hand, in the samples 21 to 23 in which the sheath was made of a PVC resin composition and the curl inner diameter was less than 3.1 times the cord outer diameter, the elongation rate was low and the shrinkage was excellent.
In particular, as shown in Table 6, the samples 22 and 23 in which the sheath is made of a PVC resin composition and the curl inner diameter is 2.3 times or more and less than 3.1 times the cord outer diameter have good electrical characteristics even after the expansion and contraction test. It was.
From the above, in order to obtain a LAN-compatible curl cord with excellent elasticity while ensuring electrical characteristics, the sheath is made of a certain PVC resin composition and the curl inner diameter is 2.3 times or more and 3.1 times the cord outer diameter. It turns out that it is useful to keep it within the range of less than.

As shown in Table 7, the samples 22 and 23 having a curl inner diameter of 2.3 times or more and less than 3.1 times the cord outer diameter had a low sagging rate and were excellent in handleability at the time of carrying.

1 Paired wire 2 Cable core 4 Sheath 5 Insulated wire 10 LAN compatible curl cord 51 Conductor 52 Insulator 60 LAN compatible curl cord with plug 62 Plug 70 (Linear) LAN cable 72 (Spiral) LAN cable 80 Mandrel A Curl inner diameter B cord outer diameter

Claims (4)

A LAN-compatible curl code that has a spiral shape.
A pair of twisted wires with a pair of insulated wires twisted together,
A sheath that covers the periphery of the anti-twisted wire is provided.
The sheath is composed of a PVC resin composition containing a polyvinyl chloride resin as a main component, and the PVC resin composition contains a polyester resin.
A LAN-compatible curl cord characterized in that the curl inner diameter of the LAN-compatible curl cord is 2.3 times or more and less than 3.1 times the cord outer diameter. In the LAN-compatible curl code according to claim 1,
A LAN-compatible curl cord characterized in that the content of the polyester resin with respect to the PVC resin composition is 10 to 20% by mass. In the LAN-compatible curl code according to claim 1 or 2.
A LAN-compatible curl cord characterized in that the polyester resin is polybutylene terephthalate. The LAN-compatible curl code according to any one of claims 1 to 3 and
A LAN-compatible curl cord with a plug, which comprises plugs attached to both ends of the LAN-compatible curl cord.

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