Cable manufacturing method

Abstract

The present invention provides a cable that is easy to use both during storage and during use. The present invention provides a method for manufacturing a cable that can The method for manufacturing a cable according to the present invention comprises: forming a core material made of a linear conductor on an outer periphery of the core material; The outermost layer is formed of a resin composition containing polyvinyl chloride. a winding step of winding the cable around a cylindrical body; and a heating step of heating for 60 minutes or more while maintaining a temperature within a range of 79°C or more and 121°C or less; The heated cable is wound around the cylindrical body and kept at a temperature within the range of 9°C to 36°C. and a cooling step of cooling the mixture to 300°C.

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a cable. More particularly, the present invention relates to a method for manufacturing a cable. ,example For example, a PC and a smartphone N To connect to a wall outlet, etc. And Martfo And The present invention relates to a manufacturing method of a cable used for connecting. [Background technology]

[0002] Conventionally, electrical outlets have been used to connect electronic devices to each other or to connect electrical outlets on walls, etc. A cable used to connect devices, equipped with connectors (connection terminals) on both ends. The cable is generally made of a linear conductor. The outer periphery of the core material is coated with a resin composition containing a thermoplastic resin.

[0003] Such cables are usually of a portable length (e.g., 50 cm to 200 cm). The insulating film is formed to have a [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-75313 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the cable formed as described above is carried in a bag or the like, the cable , and is usually stored in a rolled up state. However, the cable usually cannot be kept wound up and is easily damaged when it is carried in a bag. There is a problem with this spreading to other places, etc. That is, there is a problem in that it is difficult to use when stored.

[0006] In order to maintain the rolled up state, the cable connecting the main body of the landline telephone and the handset is When not tensioned, the cable is wound in a spiral shape, like a bull. It is also possible to configure it to something that has become a habit. However, when the cable is configured to have the above-mentioned spiral winding tendency, In this case, connect electronic devices to each other or to a wall outlet or other electrical outlet. When doing so, simply grabbing both ends of the cable with your hands and pulling them apart will not The cable is difficult to stretch until a certain length is achieved, and the stretched state is maintained. This makes connection work difficult. Therefore, in such a configuration, there is a problem that the usability during use is poor. There is.

[0007] However, for a cable that is easy to use both when storing and using, It is difficult to say that sufficient consideration has been given to this issue yet.

[0008] Therefore, the present invention provides a cable that is easy to use both during storage and during use. The objective of the present invention is to provide a method for manufacturing a cable that can achieve this. [Means for solving the problem]

[0009] As a result of intensive research by the inventors, it was found that the temperature of the material can be maintained within a predetermined range while it is wrapped around a cylindrical body. The cable manufactured by heating the cable for a predetermined period of time while maintaining the cable strength is stable both when stored and when in use. However, they found that the device could be made more user-friendly, and thus came up with the present invention.

[0010] That is, the method for producing a cable according to the present invention comprises the steps of: a winding step of winding a cable, in which an outer periphery of a core material made of a linear conductor is covered with a resin composition containing polyvinyl chloride and an outermost layer is formed of the resin composition, around a cylindrical body; a heating step of heating the cable wound around the cylindrical body for 60 minutes or more while maintaining the temperature within a range of 79° C. to 121° C.; and a cooling step of cooling the heated cable to a temperature within a range of 9°C to 36°C while the cable is wound around the cylindrical body. 、 The cable is used to connect a smartphone. Effect of the Invention

[0011] According to the present invention, it is possible to obtain a cable that is easy to use both during storage and during use. It is possible to provide a method for manufacturing a cable that can achieve the above. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a flow diagram of a method for manufacturing a cable according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, one embodiment of the present invention will be described.

[0014] As shown in FIG. 1, the method for producing a cable according to the present embodiment includes the steps of: The outer periphery of a core material made of a linear conductor is coated with a resin composition containing polyvinyl chloride, A winding step (S1) of winding the cable having the outermost layer formed of the resin composition around a cylindrical body. and, The cable wound around the cylinder is maintained at a temperature within a range of 79°C to 121°C. A heating step (S2) of heating for 60 minutes or more while keeping the temperature at 40° C.; The heated cable is wound around the cylindrical body and kept at a temperature within a range of 9°C to 36°C. and a cooling step (S3) of cooling to a temperature. Hereinafter, the method for producing a cable according to this embodiment will be described step by step.

[0015] (Winding process S1) In the winding step S1, the cable is wound around the cylindrical body. The cable is wound around the cylindrical body without any gaps (hereinafter, the pitch It is preferable that the wire is wound so that the width (also called the "wrap width") is 0 mm. In the winding step S1, the cylindrical body has an outer diameter of 1.5 cm or more and 20 cm or less. It is preferable to use one that

[0016] The cross-sectional shape of the cylindrical body is appropriately selected depending on the shape of the curl to be imparted to the cable. The shape of the habit may be a circle, a regular polygon (e.g., a square, a regular hexagon, a regular octagon), However, a circular shape is usually preferred. That is, the cross-sectional shape of the cylindrical body is , preferably circular.

[0017] The conductor of the core material may be, for example, a copper wire. The conductive member may be composed of only one conductor or may be composed of a plurality of conductors. When the core material is made of a plurality of conductors, the core material is made by twisting the plurality of conductors together. It may be configured. In addition, each of the multiple conductors has an outer periphery made of a resin composition containing polyvinyl chloride resin. It may be coated. By twisting a plurality of conductors together to form a core material, the core material has excellent flexibility. It becomes.

[0018] To connect electronic devices to each other or to a wall outlet or other electrical outlet When used as a cable, the cable thickness must be 3.0 mm or more and 5.0 mm or less. It is preferable that there is. The thickness of the cable can be measured using a micro gauge. Specifically, the thickness was measured using a micro gauge at five arbitrary points in the cable extension direction. The value can be calculated by measuring the values ​​and arithmetically averaging these values.

[0019] To connect electronic devices to each other or to a wall outlet or other electrical outlet When used as a cable, the thickness of the core material is 2.3 mm or more and 4.8 mm or less. It is preferable that there is. When the cross-sectional shape of the core material is circular, the thickness of the core material means the diameter (outer diameter) of the circle, When the cross-sectional shape of the core material is a regular polygon (for example, a square, a regular hexagon, or a regular octagon), The thickness of the core material means the diameter (outer diameter) of the circumscribing circle that circumscribes the regular polygon. The cross section means a cross section obtained by cutting the cable in a direction perpendicular to the extending direction. do.

[0020] In the cable according to the present embodiment, the thickness of the coating made of the resin composition is 0.2 mm or more. It is preferable that it be .7mm or less. The thickness of the coating is the maximum length of the cable in cross section minus the thickness of the core material. This means the value obtained by dividing by 2. The coating thickness can be measured using a microgauge. Specifically, in each of the cross sections cut at any five points in the extending direction of the cable, The coating thickness was measured at 10 random points using a micro gauge. It can be determined by arithmetically averaging the fixed values. In addition, the cable is used to connect electronic devices to each other or to a wall outlet or other electrical outlet. When used as a cable to connect to a child device, the length of the cable (stretched in a straight line) The straight-line distance when the cable is extended is, for example, 50 cm to 200 cm (0.5 m or more). The length is within the range of 2m or less.

[0021] The resin composition contains, in addition to polyvinyl chloride, a plasticizer, a stabilizer, a binder, It may contain fillers, color powders, etc. The plasticizer may be a phthalate ester. Examples of the above-mentioned phthalates include dibutyl phthalate (DBP) and dioctyl phthalate (DOP). The plasticizer reduces the flow viscosity of the resin composition when heated during molding. In addition to making processing easier, the cable is also flexible and easy to handle after it is made into a cable. By imparting rubber elasticity to the cable, the cable can be made excellent in extensibility. do. The stabilizer is tribasic lead sulfate (3PbO·PbSO4·H 2O) etc. The filler may, for example, be calcium carbonate. The color powder may include titanium oxide. The resin composition may further contain a lubricant. The lubricant may be dibasic lead stearate (2PbO·Pb·Stearate). Some examples include: The resin composition comprises the plasticizer, the stabilizer, a filler, and When color powder is contained, the plasticizer is 10 parts by mass per 100 parts by mass of the polyvinyl chloride. It is preferable that the stabilizer is contained in an amount of 100 parts by mass or more. The filler is preferably contained in an amount of 1 part by mass or more and 10 parts by mass or less, and the filler is preferably contained in an amount of 33 parts by mass or less. It is preferable that the color powder is contained in an amount of 0.5 parts by mass to 1. It is preferable that the content is 0 parts by mass or less. In addition, when the resin composition further contains the lubricant, the resin composition is The lubricant is contained in an amount of 0.5 parts by mass or more and 5 parts by mass or less per 100 parts by mass of vinyl chloride. It is preferable that

[0022] The outer periphery of the core material may be covered with a resin composition containing polyvinyl chloride by various known methods. Examples of the various known methods include melt extrusion molding. The melt extrusion molding is carried out using a general melt extrusion molding apparatus, for example, by passing the core material in a wound state downstream. a delivery section for delivering the core material to the downstream side of the delivery section, and a melting section for melting the outer periphery of the delivered core material. The resin composition is then coated with the core material (hereinafter, referred to as "coated core material"). An extrusion section that extrudes a covering core material (also called a covering material) downstream, and a covering core material (also called a covering material) is disposed downstream of the extrusion section. a cooling section for cooling and solidifying the resin composition; and a cooling section disposed downstream of the cooling section for cooling and solidifying the resin composition. and a winding section for winding up the covering core material (i.e., the cable) after the composition has solidified. This can be done using an apparatus such as

[0023] (Heating process S2) In the heating step S2, the cable wound around the cylindrical body is heated to a temperature of 79° C. to 121° C. It is important to heat for at least 60 minutes while maintaining the temperature within the following range. The heating step S2 can be carried out using a general heating furnace. While maintaining the temperature within the range of 79℃ to 121℃, heat for 60 minutes or more, and then In the cooling process S3, the temperature is cooled to 9°C or higher and 36°C or lower, thereby preventing the spiral curl. By simply grabbing both ends of the cable with the mark and pulling them apart, The cable can be relatively easily stretched until the required length is reached, and in the stretched state can be relatively maintained. In addition, when the material is wound into a spiral shape from a stretched state, the spiral shape can be relatively maintained. This improves ease of use during storage and use. The heating temperature in the heating step S2 is preferably 89°C or higher and 121°C or lower.

[0024] While maintaining the temperature within the range of 79℃ to 121℃, heat for 60 minutes or more, then reduce by 9℃ The inventors of the present invention have been investigating the reason why the above-mentioned effect is achieved by cooling the temperature to 36°C or lower. thinks as follows: That is, in a state where the cable is wound around the cylindrical body, the temperature is within a range of 79°C to 121°C. After heating for 60 minutes or more while maintaining the temperature within the range, the product is cooled to between 9℃ and 36℃. The wrapped cable is appropriately shrunk on the inside (the side in contact with the cylindrical body). The material solidifies in a stretched state, while the outer side (the side not in contact with the cylinder) solidifies in a moderately stretched state. When the wire is wound, it becomes easier to maintain the wound state and the wire is easy to pull. When stretched, it takes on a curl that makes it easier to maintain the stretched state. It is possible. As a result, the cable was wound in a spiral shape, and both ends of the cable were grabbed by hand and separated. The cable can be relatively easily stretched to a certain length by simply pulling it. It can be stretched and the stretched state can be relatively maintained, and it can be stretched from the stretched state. When wound into a spiral shape, the spiral shape can be relatively well maintained. I believe that we have become able to do this.

[0025] In addition, the upper limit of heating time is set as follows, because if the heating time is too long, the energy efficiency will decrease. Preferably, it is 240 minutes.

[0026] (Cooling process S3) In the cooling step S3, the heated cable is wound around the cylindrical body and cooled to a temperature of 9° C. or higher for 3 hours. The temperature is cooled to a temperature within a range of 14°C to 31°C. and more preferably at a temperature of 19°C or higher and 26°C or lower. The time required to cool the food to a temperature between 9°C and 36°C must be between 20 and 40 minutes. is preferred. In addition, when the heating step S2 is performed in a heating furnace, the cooling step S3 is, for example, The cable is naturally cooled to a temperature within the range of 9°C to 36°C in the heating furnace. The heated cable is then heated to a predetermined temperature (for example, 39°C to After cooling naturally to a temperature of 51°C, remove it from the heating furnace and place it in the open air at a temperature of 9°C or less. This can be done by further cooling naturally to a temperature within the range of 36°C or less. do. In addition, when a cylinder having an outer diameter of 1.5 cm or more and 20 cm or less is used, After the cooling step S3, the maximum length of the wound portion of the cable (hereinafter also referred to as the winding diameter) is The range is between 2.3cm and 30cm.

[0027] The cable manufacturing method according to the present invention is not limited to the above-described embodiment. The cable manufacturing method according to the present invention is not limited to the above-mentioned effects. The cable manufacturing method according to the present invention can be modified in various ways without departing from the spirit and scope of the present invention. Changes are possible. EXAMPLES

[0028] The present invention will now be described in more detail with reference to examples. The above description is provided to further illustrate the invention and is not intended to limit the scope of the invention.

[0029] [Tensile test] Specimens for tensile testing were obtained as follows. First, three cables (Cable A, Cable B, and Cable C) each having a length of approximately 1 m (1 m ± 1 cm) and a core material made of a conductor (multiple conductors (copper wires) coated with a resin composition on the outer periphery) coated with a resin containing polyvinyl chloride on the outer periphery were spirally wound with a pitch width of 0 mm around a cylindrical tube (diameter (outer diameter) 3.8 cm × height 200 cm) to obtain a tube with the cables wrapped around it (hereinafter also referred to as a tube with cables). Next, these cylinders with cables (the cylinder with cable A wound around it, the cylinder with cable B wound around it, and the cylinder with cable C wound around it) were placed in a heating furnace and treated at 120±1°C for 60 minutes. Next, these cylinders with cables were naturally cooled to room temperature (23±2°C) in a heating furnace to obtain specimens for tensile tests. The maximum length of one turn of each cable obtained by wrapping it around a cylinder with a diameter (outer diameter) of 3.8 cm and heating it was 5.5±1.5 cm (hereinafter, also referred to as the winding diameter). Cable A, Cable B, and Cable C all had a circular cross-sectional shape. In addition, in cable A, the thickness (outer diameter) of the core material is 3.2 mm, and the thickness of the coating is 0.4 mm. the law of nature,In cable B, the thickness (outer diameter) of the core material is 3.3 mm, and the thickness of the coating is 0.4 mm. the law of nature, In cable C, the thickness (outer diameter) of the core material is 4 mm, and the thickness of the coating is 0.4 mm. Ta. The coating thickness of each of the cables A to C was measured according to the method described in the embodiment section above. Moreover, the thickness of each of the cables A to C was measured according to the method described in the embodiment section above. Three specimens for each cable (total of nine specimens) were prepared for the tensile test. Then, a tensile test was carried out on each specimen (a total of nine specimens) according to the following procedure. (1) One end of the specimen is fixed to the top plate of a fixture having a top plate. (2) With the specimen hanging down from the top plate, measure the length from the fixed point on one end of the specimen to the tip of the other end of the specimen (length L1 before the weight is attached). (3) Attach a 100 g weight to the other end of the specimen and leave it for 60 minutes. (4) Remove the 100 g weight from the other end of the specimen. (5) Measure the length from the fixed point on one end of the specimen to the tip of the other end of the specimen (length L2 after the weight is attached).

[0030] The results of the tensile test for cable A are shown in Table 1 as Examples 1 to 3. The results of the experiments for cable B are shown in Table 2 as Examples 4 to 6, and those of cable C are shown in Table 2 as Example 7. 9 is shown in Table 3. In addition, in order to compare with the tensile test results of the cables according to Examples 1 to 9, Cable B and Cable C were not subjected to the above heat treatment. Three cables were prepared (a total of nine), and tensile tests were performed according to the above procedure. The results of the cable A are shown in Table 1 as Comparative Examples 1 to 3. The cables B are shown in Table 2 as Comparative Examples 7 to 9, and the cables C are shown in Table 2 as Comparative Examples 13 to 1. 5, as shown in Table 3. In addition, to compare with the tensile test results of the cables prepared as described above, cable A Cable B and Cable C are each placed in a cylindrical tube (diameter (outer diameter) 1 cm x height After winding the material in a spiral shape on a sheet of paper (length 200 cm) with a pitch width of 0 mm, they were heated in a heating furnace. Heat the material at 120±1℃ for 40 minutes, then allow it to cool naturally to room temperature (23±2℃) in the heating furnace. Therefore, it is necessary to test the spiral tensile test of the telephone body and the handset. Three specimens each (a total of nine specimens) were prepared and tensile tests were performed according to the procedure described above. The results of the cable A are shown in Table 1 as Comparative Examples 4 to 6. The cables B are shown in Table 2 as Comparative Examples 10 to 12, and the cables C are shown in Table 2 as Comparative Example 16. ~18, as shown in Table 3.

[0031] [Table 1]

[0032] [Table 2]

[0033] [Table 3]

[0034] From Tables 1 to 3, the cable A (Examples 1 to 3) and the cable B (Example 4) Cables A (Examples 1 to 6) and Cable C (Examples 7 to 9) were not subjected to heat treatment. Cable A (Comparative Examples 1 to 3), Cable B (Comparative Examples 7 to 9), and Cable C (Comparative Example 1 Compared to 3-15), the length L2 after the weight is attached is shorter, allowing for compact storage. It can be seen that the following is true. In addition, the cables A, B, and C according to the respective embodiments are all s Cable A (Comparative Examples 4 to 6), Cable B (Comparative Examples 10 to 12), each having a spiral shape; In addition, compared to cable C (comparative examples 16 to 18), the length L2 after the weight was attached was sufficient. It can be seen that...

[0035] [Evaluation of maintenance of winding state] Before carrying out the tensile test, the specimens according to Examples 1 to 9 were evaluated for their ability to maintain the wound state. did. The maintenance of the wound state was evaluated according to the following procedure. (1) With the specimen in a stretched state, both ends are fixed while maintaining that state. (2) Keep the specimen with both ends fixed for 24 hours. (3) Release the specimen from the fixed state at both ends and place it on a flat plate with a diameter of 5.5 ± 1.5 cm. The specimen is rolled up so that it forms a spiral shape with multiple circles of m connected together. (4) Repeat steps (1) to (3) for 5 cycles, and wait 10 minutes after each cycle. Afterwards, the length of the longest part of one turn (hereinafter also referred to as the turn diameter) is measured. (5) In all five cycles, the length of the longest part of one turn (winding diameter) was 5.5 ± 1. If the difference is within 5 cm, it is determined that the wound state is maintained. The results are shown in Table 4 below.

[0036] [Table 4]

[0037] According to the above procedure, the specimens according to Examples 1 to 9 were evaluated for their ability to maintain the wound state. As a result, for all samples, the length of the longest part of one turn (winding diameter) was within the above numerical range ( 5.5±1.5 cm). It was found that all of the bodies were able to maintain their coiled state (see Table 4). In contrast, cables A according to comparative examples 1 to 3, cables B according to comparative examples 7 to 9, and For the cables C according to the comparative examples 13 to 15, the diameter was 5.5±1.5 cm on a flat plate. I tried to roll it so that it would form a shape with multiple circles of m connected together, but it spread out and ended up rolling like this. I couldn't do it. In addition, cables A according to Comparative Examples 4 to 6, cables B according to Comparative Examples 10 to 12, and The cable C according to Comparative Examples 16 to 18 has a strong winding tendency with a diameter of 1.5 cm. It was only possible to wind the wire with a winding diameter far below the value range (5.5±1.5 cm).

[0038] [Evaluation of maintenance of winding state after tensile test] After the tensile tests were performed as described above, the cables according to Examples 1 to 9 were The maintenance was evaluated. The maintenance of the winding state of each cable after the tensile test was The bull was placed on a flat plate and formed into a spiral shape with multiple circles of 5.5 ± 1.5 cm in diameter. ) and measure the length of the longest part of one roll (roll diameter) after 10 minutes. This was done by. And, if the length of the longest part of one roll (roll diameter) is within the range of 5.5 ± 1.5 cm If the wire was wound as described above, it was determined that the wound state was maintained. The results are shown in Table 5 below.

[0039] [Table 5]

[0040] From Table 5, the cables according to Examples 1 to 9 all had the same winding diameter even after the tensile test. The range of the wire length was 5.5±1.5cm, and it was found that the wire could be kept in a rolled state. .

[0041] From the results of the above tensile tests and the evaluation of the maintenance of the wound state, it was found that the outer circumference of the core material was polychlorinated A cable that is coated with a resin composition containing vinyl and has an outermost layer formed of the resin composition. The coil is wrapped around a cylinder, heated at an appropriate temperature for an appropriate time, and then cooled to room temperature. The cable obtained by this is easy to use both during storage and during use. It can be seen that...

[0042] [Effect of heat treatment conditions on cable properties] A core material made of a conductor (copper wire) (multiple conductors (copper wires) coated with a resin composition on the outer periphery are twisted together) The outer circumference of the cable is covered with a resin containing polyvinyl chloride. Regarding cable A, cable B, and cable C, the effect of heat treatment conditions on the cable properties was examined. The effects of The specimen was a cylindrical object with a diameter (outer diameter) of 3.8 cm and a height of 200 cm, with pins attached to the outer circumference. The cable had a width of 0 mm and was wound in a spiral shape. The heat treatment conditions are: in a heating furnace, temperature 30±1℃~240±1℃, 10~210 The condition was that the samples would be processed separately. After heating, each cable is left to cool naturally to room temperature (23±2℃) in the heating furnace. Cooled under conditions. The above tensile test and evaluation of the maintenance of the wound state were carried out for each heat-treated specimen. The evaluation was based on the following criteria. The length L2 after the weight is attached is between 70cm and 90cm, and the coil shape is In the evaluation of the maintenance of the state, all five cycles were within the range of 5.5 ± 1.5 cm. × Either the length L2 after the weight is attached or the evaluation of the maintenance of the wound state does not meet the above criteria. does not conform to. The results for Cable A are shown in Table 6 below, the results for Cable B are shown in Table 7 below, and the results for Cable The results of Rule C are shown in Table 8 below.

[0043] [Table 6]

[0044] [Table 7]

[0045] [Table 8]

[0046] From Tables 6 to 8, for Cable A, Cable B, and Cable C, By heating at a temperature between ±1℃ and 120±1℃ for 60 minutes or more, the evaluation result will be 〇. It was found that it was possible to obtain a cable that could be used for this purpose. In addition, when the heating temperature was 30±1℃ and 60±1℃, the length after the weight was attached was The length L2 exceeds the upper limit of the evaluation criteria of 90 cm, and the heating temperature is 90 ± 1 ° C and 12 Even when treated at 0±1℃ for 10 and 30 minutes, the length L2 after the weight was attached was within the evaluation criteria. Since it exceeded the upper limit of 90cm, the result was marked as ×. In addition, when the temperature was 150±1℃~240±1℃, the length after the weight was attached L 2 was rated as x because it was below the lower limit of the evaluation criteria of 70 cm. When treated at 150±1℃~240±1℃, part of the resin composition melts and the The cables I attached were stuck together. From these results, it was found that the cable in which the outer circumference of the core material is covered with a resin composition containing polyvinyl chloride The material is wrapped around a cylindrical body and heated at a temperature between 89°C and 121°C for 60 minutes or more. By cooling it down to room temperature, a cable that is easy to use during storage and use can be obtained. I found that it is possible. Table 9 below shows the results for Cable A after heating at 90±1°C for 60 to 210 minutes. The results of evaluating the maintenance of the winding state (maintenance of the winding state after the above-mentioned 5 cycles) Table 10 shows the results for cable B after heating at 90±1°C for 60 to 210 minutes. The results of the evaluation of the maintenance of the wound state are shown in Table 11. The results of the evaluation of the maintenance of the winding state of cable C after heating are shown in Table 12. After heating at 120±1℃ for 60 to 210 minutes, the results are shown in Table 1. The results of the evaluation of the maintenance are shown in Table 13. The results of evaluating the maintenance of the winding state of Cable B after 120 The maintenance of the winding state of cable C after heating at ±1°C for 60 to 210 minutes was The evaluation results are shown.

[0047] [Table 9]

[0048] [Table 10]

[0049] [Table 11]

[0050] [Table 12]

[0051] [Table 13]

[0052] [Table 14]

[0053] [Effect of winding diameter on cable winding condition] In order to examine the effect of the maximum length of the wound portion of the cable (winding diameter) on the winding state of the cable, samples for evaluating the maintenance of the winding state were obtained as follows. First, two cables (Cable A and Cable B) each having a length of approximately 2 m (2 m ± 1 cm) and a core material made of a conductor (multiple conductors (copper wires) twisted together and coated with a resin composition on the outer periphery) and coated with a resin containing polyvinyl chloride on the outer periphery were spirally wound with a pitch width of 0 mm around a cylindrical tube (diameter (outer diameter) 6.3 cm × height 200 cm) to obtain a tube with the cables wrapped around it (hereinafter referred to as the tube with cables). Next, these cylinders with the cables (the cylinder with cable A wound around it and the cylinder with cable B wound around it) were placed in a heating furnace and treated at 120° C.±1° C. for 60 minutes. Next, these cylinders with cables were naturally cooled to room temperature in a heating furnace to obtain specimens for evaluating the maintenance of the wound state. The maximum length of one turn (winding diameter) of each cable obtained by winding it around a cylinder with a diameter (outer diameter) of 6.3 cm and heat-treating it was 9.5±1.5 cm. Both Cable A and Cable B had a circular cross-sectional shape. In addition, in cable A, the thickness (outer diameter) of the core material is 3.5 mm, and the thickness of the coating is 0.35 mm. the law of nature, In cable B, the thickness (outer diameter) of the core material was 3.9 mm, and the thickness of the coating was 0.35 mm. Ta. The coating thickness of cables A and B was measured according to the method described in the embodiment section above. Moreover, the thickness of the cables A and B was measured according to the method described in the embodiment section above.

[0054] The maintenance of the wound state was evaluated for each cable after the tensile test. In detail, after the tensile test, each cable is placed on a flat plate with a diameter of 9.5 ± 1.5 cm. After 10 minutes, the end of one roll is This was done by measuring the length of the long portion (winding diameter). And, if the length of the longest part of one roll (roll diameter) is within the range of 9.5 ± 1.5 cm If the wire was wound as described above, it was determined that the wound state was maintained. The results are shown in Table 15 below.

[0055] [Table 15]

[0056] From Table 15, both Cable A and Cable B had the same winding diameter even after the tensile test. is within the range of 9.5±1.5cm, and the wound state is maintained. It was found that the wound state could be maintained regardless of the winding diameter.

[0057] [Maintenance of the winding state of the cable when heated at a temperature of 80±1℃] The same procedure was followed as in the tensile test, except that the treatment temperature in the heating furnace was 80±1°C. As a result, three samples of Cable B were obtained, which were heated at 80±1°C. After the tensile test, each cable was evaluated for its ability to maintain its wound condition. In detail, after the tensile test, each cable is placed on a flat plate and measured with a diameter of 5.5cm ± 1. Roll it into a spiral shape with multiple 5cm circles connected together, and after 10 minutes, roll it once. This was done by measuring the length of the longest part (winding diameter). And, if the length of the longest part of one roll (roll diameter) is within the range of 5.5 ± 1.5 cm If the wire was wound as described above, it was determined that the wound state was maintained. The results are shown in Table 16 below.

[0058] [Table 16]

[0059] From Table 16, it can be seen that cable B has a winding diameter of 5.5±1.5cm even after the tensile test. In other words, when the heating temperature is 80°C, the coil is within the range of 100°C and the coil can be kept in a wound state. It was found that it is possible to obtain a cable that can maintain its wound state even if the wire is wound in a direction perpendicular to the wire. [Explanation of symbols]

[0060] S1 winding process, S2 heating process, S3 cooling process.

Claims

1. a winding step of winding a cable, in which an outer periphery of a core material made of a linear conductor is covered with a resin composition containing polyvinyl chloride and an outermost layer is formed of the resin composition, around a cylindrical body; a heating step of heating the cable wound around the cylindrical body for 60 minutes or more while maintaining the temperature within a range of 79° C. to 121° C.; and a cooling step of cooling the heated cable to a temperature within a range of 9°C to 36°C while the cable is wound around the cylindrical body, The cable has a winding diameter of 5.5±1.5 cm; The cable is used to connect a smartphone. How the cable is manufactured.

2. The coating thickness of the resin composition is 0.2 mm or more and 0.7 mm or less. A method for producing the cable according to claim 1.

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