JP2017010757A - Continuous crosslinking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous crosslinking method capable of suppressing flatness of a composition at a position where a wire material and a return pulley contact during a stop crosslinking process.SOLUTION: There is provided a continuous crosslinking method including a normal crosslinking process S101 and a stop crosslinking process S103 and further including a low speed crosslinking process S102 for proceeding cooling of a composition at a downstream part 207 before transition from the normal crosslinking process S101 to the stop crosslinking process S103 by slowing a speed of sending out a wire material 204 than that of the normal crosslinking process S101. In the low speed crosslinking process S102, it is preferable to proceed cooling of the composition 203 as a degree that the composition 203 is not flat at a position where the wire material 204 and the return pulley 210 contact during the stop crosslinking process S103 and cure it. It is preferable to gradually reduce a speed for sending out the wire material 204 in the low speed crosslinking process S102 than that of the normal crosslinking process S101.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a continuous crosslinking method in which crosslinking and cooling of a composition are continuously performed while feeding a wire formed by coating the composition around a core wire.

  Usually, a cable is manufactured using the continuous bridge | crosslinking method which performs continuously bridge | crosslinking and cooling of a composition, sending out the wire which coat | covers a composition around a core wire.

  As the continuous crosslinking method, a vertical continuous vulcanization (VCV) method and a catenary continuous vulcanization (CCV) method are recognized (for example, see Patent Documents 1 and 2).

In the continuous cross-linking method, as shown in FIGS. 5 and 6, the wire 504 formed by coating the composition 503 around the core wire 502 is fed at a constant speed V ₁ through the extrusion coater 501 through the normal cross-linking step S 501. The composition 503 is continuously cross-linked and cooled by passing through the cross-linking cylinder 506 filled with the heating medium 505 and the cooling cylinder 508 filled with the cooling medium 507.

  In the normal crosslinking step S501, since it is necessary to complete the crosslinking and cooling of the composition 503 before the composition 503 passes through the crosslinking cylinder 506 and the cooling cylinder 508, the crosslinking cylinder 506 and the cooling cylinder 508 The bridge 506 is secured via a return pulley 509 that changes the direction in which the wire 504 is sent out from the viewpoint of improving the space utilization efficiency of a factory or the like. The cooling cylinder 508 is connected back.

  At this time, the bridging cylinder 506 is divided into an upstream portion 510 and a downstream portion 511, the upstream portion 510 is filled with the heating medium 505 and the downstream portion 511 is filled with the cooling medium 507, and the upstream portion 510 bridges the composition 503. And the cooling of the composition 503 is started at the downstream portion 511, so that the composition 503 is prevented from being flattened when the wire 504 passes through the return pulley 509.

  Furthermore, in the continuous cross-linking method, as shown in FIGS. 5 and 7, after passing through the stop cross-linking step S <b> 502, the supply of the wire 504 is stopped and the supply of the wire 504 is stopped. The crosslinking of the composition 503 that has not been completed is completed, and then the cooling of the composition 503 that has not passed through the upstream portion 510 when the upstream portion 510 is filled with the cooling medium 507 and the delivery of the wire 504 is stopped. By completing the above, wire rods 504 discarded as extra long scrap are reduced.

JP-A-48-088883 JP-A-56-091313

  However, in the stop-crosslinking step S502, the wire 504 is sent out for a relatively long time in order to complete the cross-linking of the composition 503 that has not passed through the upstream portion 510 when the sending of the wire 504 is stopped. Therefore, the composition 503 may be flattened at the position 512 where the wire 504 and the return pulley 509 are in contact with each other during the stop-crosslinking step S502.

  That is, the composition 503 at the position 512 where the wire 504 and the return pulley 509 are in contact with each other during the stop-crosslinking step S502 is very easily deformed just after cooling is started at the downstream portion 511 of the cross-linking cylinder 506. In addition to the contact stress generated at the position 512 where the wire 504 and the return pulley 509 are in contact, the wire 504 is easily crushed and flattened by its own weight or the like.

  Then, the objective of this invention is providing the continuous bridge | crosslinking method which can suppress that a composition flattens in the position which a wire and a return pulley contact during implementing a stop bridge | crosslinking process.

  In the present invention, the wire formed by coating the composition around the core wire is sent out at a constant speed, while passing through a bridging cylinder filled with a heating medium in the upstream portion and filled with a cooling medium in the downstream portion. A cooling cylinder filled with the cooling medium via a return pulley that completes the crosslinking of the composition in the upstream portion, starts cooling the composition in the downstream portion, and subsequently changes the direction of feeding the wire. Of the composition not passing through the upstream portion at the time of stopping the delivery of the wire by stopping the delivery of the wire by stopping the delivery of the wire. Completion of cross-linking, and subsequently, completion of cooling of the composition that has not passed through the upstream portion when the upstream portion is filled with the cooling medium and the delivery of the wire is stopped A cooling method for cooling the composition at the downstream portion before moving from the normal cross-linking step to the stop cross-linking step at a rate slower than that of the normal cross-linking step. This is a continuous crosslinking method further comprising a low-speed crosslinking step in which

  In the low-speed crosslinking step, the composition is allowed to cool and harden to the extent that the composition does not flatten at the position where the wire and the return pulley are in contact with each other during the stop-crosslinking step. Is desirable.

  In the low-speed cross-linking step, it is desirable that the speed at which the wire is fed out is gradually slower than the normal cross-linking step.

  ADVANTAGE OF THE INVENTION According to this invention, the continuous bridge | crosslinking method which can suppress that a composition flattens in the position which a wire and a return pulley contact during implementing a stop bridge | crosslinking process can be provided.

It is process drawing explaining the continuous crosslinking method which concerns on this invention. It is the schematic explaining the normal bridge | crosslinking process in FIG. It is the schematic explaining the low-speed bridge | crosslinking process in FIG. It is the schematic explaining the stop bridge | crosslinking process in FIG. It is process drawing explaining the continuous bridge | crosslinking method based on a prior art. It is the schematic explaining the normal bridge | crosslinking process in FIG. It is the schematic explaining the stop bridge | crosslinking process in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the continuous crosslinking method according to the embodiment of the present invention includes a normal crosslinking step S101, a low-speed crosslinking step S102, and a stop crosslinking step S103.

In the normal crosslinking step S101, as shown in FIG. 2, while feeding an extrusion coater 201 wire 204 a constant speed V ₁ obtained by coating the composition 203 on the periphery of the core wire 202 through, pressurized steam or the like in the upstream portion 205 The heating medium 206 is filled and the downstream part 207 is passed through a crosslinking cylinder 209 filled with a cooling medium 208 such as cooling water to complete the crosslinking of the composition 203 in the upstream part 205 and the composition in the downstream part 207. Then, the cooling of the composition 203 is advanced by passing through the cooling cylinder 211 filled with the cooling medium 208 via the return pulley 210 that changes the direction in which the wire 204 is sent out.

  Thereby, since the composition 203 can be hardened somewhat before the wire 204 reaches the return pulley 210, the composition 203 is prevented from being flattened when the wire 204 passes through the return pulley 210. It becomes possible to do. That is, it becomes possible to reduce the man-hours for repairing the cable 212 after the normal crosslinking step S101.

  In the stop-crosslinking step S103, as shown in FIG. 3, when the feeding of the wire 204 is stopped and the feeding of the wire 204 is stopped, the crosslinking of the composition 203 that has not passed through the upstream portion 205 is completed. Subsequently, when the upstream portion 205 is filled with the cooling medium 208 and the feeding of the wire 204 is stopped, the cooling of the composition 203 that has not passed through the upstream portion 205 is completed.

  Thereby, since it can complete the bridge | crosslinking and cooling of the composition 203 which has not passed through the upstream part 205 at the time of stopping sending out the wire 204, the wire 204 which is originally discarded as extra long waste. Can be used as the cable 212, so that it is possible to significantly reduce excess waste.

  Now, the continuous crosslinking method according to the embodiment of the present invention includes a low-speed crosslinking step S102 that is usually performed between the crosslinking step S101 and the stop-crosslinking step S103.

In the low-speed cross-linking step S102, allowed to proceed for cooling of the composition 203 at a downstream portion 207 before the transition from the normal crosslinking step S101 the speed for feeding the wire 204 as a lower speed V ₂ than the normal crosslinking step S101 to stop the crosslinking step S103 Keep it.

  That is, while the stop-crosslinking step S103 is performed, the composition 203 is cooled and cured so that the composition 203 does not flatten at a position 213 where the wire 204 and the return pulley 210 are in contact with each other.

  Thereby, even if it stops stopping sending out the wire 204 for a relatively long time, the composition 203 at the position 213 where the wire 204 and the return pulley 210 are in contact with each other is difficult to be flattened during the stop-crosslinking step S103. .

  In the low-speed crosslinking step S102, it is desirable that the speed at which the wire 204 is fed out is gradually slower than that in the normal crosslinking step S101. Thereby, it becomes possible to suppress fluctuations in the outer diameter of the wire 204 due to a rapid change in the speed at which the wire 204 is fed out.

  Moreover, in the low speed bridge | crosslinking process S102, the pressure of the heating medium 206 and the speed which sends out the wire 204 are appropriately adjusted for every kind and size of a cable. At this time, it is desirable to determine the pressure of the heating medium 206 based on the speed at which the wire 204 is delivered, that is, the cooling time of the composition 203.

  As described above, according to the continuous cross-linking method according to the embodiment of the present invention, the low-speed cross-linking step S102 is provided between the normal cross-linking step S101 and the stop cross-linking step S103. It is possible to prevent the composition 203 from being flattened at the position 213 where the wire 204 and the return pulley 210 are in contact with each other.

201 extrusion coating machine 202 core wire 203 composition 204 wire 205 upstream part 206 heating medium 207 downstream part 208 cooling medium 209 bridging cylinder 210 return pulley 211 cooling cylinder 212 cable 213 position where wire and return pulley come into contact

Claims (3)

While feeding the wire formed by coating the composition around the core wire at a constant speed, the upstream portion is filled with a heating medium and the downstream portion is filled with a cooling medium, and is passed through the bridging cylinder in the upstream portion. Complete the crosslinking of the composition and start cooling the composition in the downstream portion, and then pass through a cooling cylinder filled with the cooling medium via a return pulley that changes the direction of feeding the wire. A normal crosslinking step in which cooling of the composition proceeds,
When the feeding of the wire is stopped and the feeding of the wire is stopped, the crosslinking of the composition that has not passed through the upstream portion is completed, and then the cooling medium is also applied to the upstream portion. A stop-crosslinking step of completing cooling of the composition that has not passed through the upstream portion when filling and stopping delivery of the wire; and
A continuous crosslinking method comprising:
It further includes a low-speed cross-linking step in which the cooling rate of the composition is advanced in the downstream portion before the wire is fed out at a lower speed than the normal cross-linking step and before the transition from the normal cross-linking step to the stop cross-linking step. A continuous crosslinking method characterized by   In the low-speed crosslinking step, the cooling of the composition is progressed and cured to the extent that the composition does not become flat at the position where the wire and the return pulley come into contact with each other during the stop-crosslinking step. Item 2. The continuous crosslinking method according to Item 1.   3. The continuous crosslinking method according to claim 1, wherein, in the low-speed crosslinking step, a speed at which the wire is fed out is gradually slower than the normal crosslinking step.

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