JP6099690B2 - Rubber hose manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a rubber hose.

  As described in Patent Documents 1-3, when a rubber hose is vulcanized using a mandrel, a release agent is placed on the surface of the mandrel or the inner peripheral surface of the rubber hose in order to extract the rubber hose from the mandrel after vulcanization. Apply. Therefore, it is necessary to remove the release agent from the rubber hose after vulcanization. Patent Document 2 describes that a mold release agent is washed using a detergent. Patent Document 3 describes that a release agent attached to a rubber hose is cleaned with a high-pressure cleaning liquid.

Japanese Patent No. 2757038 JP-A-11-90992 Japanese Patent No. 4316292

  In the case of using a detergent, a detergent cost is required and a waste liquid treatment is required. Further, when a high-pressure cleaning liquid is used, the manufacturing apparatus becomes expensive.

  An object of this invention is to provide the manufacturing method of the rubber hose which can wash | clean a mold release agent with a simple apparatus, without using a detergent.

The method for producing a rubber hose is a method for producing a rubber hose comprising a washing step of washing the mold release agent in a rubber hose to which a mold release agent for extracting the rubber hose after vulcanization is attached from a mandrel, and the mold release agent comprises: The release agent that is a surfactant having a cloud point and is in a water-soluble state with respect to water having a temperature lower than the cloud point, and the cleaning step is directly attached to the surface of the rubber hose by water having a temperature lower than the cloud point. The rubber hose after the first cleaning step is placed in a high temperature tank that stores water at a temperature higher than the cloud point, and water molecules are added to the rubber hose with water at a temperature higher than the cloud point. A second cleaning step of aggregating the molecules of the release agent remaining through the rubber hose to separate the release agent from the rubber hose .

As described above, the mold release agent is a surfactant that becomes water-soluble in water at a temperature lower than the cloud point. In the first cleaning step, water is simply used. However, water having a temperature lower than the cloud point is used. In the presence of water at a temperature lower than the cloud point, the release agent becomes water-soluble, so that the release agent attached to the rubber hose is separated from the rubber hose by the low-temperature water. Therefore, the mold release agent adhering to the rubber hose is washed only by using water having a temperature lower than the cloud point. That is, it is not necessary to use a detergent, and it is not necessary to use a high-pressure cleaning liquid. Therefore, the rubber hose can be manufactured at a low cost.
The cleaning process includes a second cleaning process. Even if the release agent molecules remain in the rubber hose conveyed from the first cleaning step, if the rubber hose remains through the water molecules, the rubber hose is placed in a high-temperature tank, so that the release agent molecules are removed. It can be aggregated in a state separated from the rubber hose. Therefore, at the end of the second cleaning step, the release agent molecules can be completely separated from the rubber hose.

It is a flowchart which shows the manufacturing method of the rubber hose of 1st embodiment. It is a figure of the state which inserted the rubber hose in the mandrel in the rubber hose insertion process of FIG. It is a graph which shows the relationship between the temperature of the water containing a release agent, and the affinity of a release agent and water. It is a figure which shows the washing-drying apparatus used for the 1st washing | cleaning process of FIG. 1, a 2nd washing process, and a drying process. (A) at the beginning of the first cleaning step, (B) at the end of the first cleaning step, (C) at the time of transport from the first cleaning device to the second cleaning device, (D) at the end of the second cleaning step, ( It is a schematic diagram of the state of the molecule | numerator of the mold release agent and the water molecule | numerator of the vicinity of the surface of a rubber hose in each of the initial stage of E) drying process, and the completion | finish of (F) drying process. It is a figure which shows the 1st washing | cleaning apparatus in 2nd embodiment.

<First embodiment>
(1. Overview of manufacturing method)
An outline of a method for manufacturing the rubber hose 1 according to the first embodiment will be described with reference to FIGS. 1 and 2. The production method of the present embodiment is a method of producing a vulcanized rubber hose 1 by vulcanizing an unvulcanized or semi-vulcanized rubber hose 1 formed into a straight shape by extrusion molding or the like. In particular, the manufacturing method of this embodiment vulcanizes and manufactures a bent rubber hose 1.

  The manufacturing method of the rubber hose 1 is processed in the order shown in FIG. First, a release agent is applied to the surface of the mandrel 2 or the inner peripheral surface of the unvulcanized or semi-vulcanized straight rubber hose 1 (S1: release agent application step). The release agent may be applied by brushing or spraying, or the object (mandrel 2 or rubber hose 1) may be immersed in a tank storing the release agent. Here, the mold release agent is necessary for extracting the vulcanized rubber hose 1 from the mandrel 2.

  Subsequently, as shown in FIG. 2, the straight rubber hose 1 is inserted into the mandrel 2 (S2: rubber hose insertion step). The insertion of the rubber hose 1 into the mandrel 2 may be performed by a person or a robot. At this time, a cap (not shown) is attached to the tip of the mandrel 2 to position the rubber hose 1. Moreover, it is common to heat the mandrel 2 before inserting the rubber hose 1 into the mandrel 2. By heating the mandrel 2, the rubber hose 1 can be easily inserted into the mandrel 2.

  Subsequently, the rubber hose 1 inserted into the mandrel 2 is vulcanized (S3: vulcanization step). Vulcanization may be performed in a batch process with a vulcanizer or continuously with a continuous vulcanization furnace. Subsequently, the rubber hose 1 after vulcanization is extracted from the mandrel 2 (S4: rubber hose extraction step). The extraction of the rubber hose 1 from the mandrel 2 may be performed by a person or a robot. When the cap is attached, the rubber hose 1 is removed after the cap is removed from the mandrel 2. Here, a release agent is interposed between the surface of the mandrel 2 and the inner peripheral surface of the rubber hose 1. Therefore, it is relatively easy to extract the curved rubber hose 1 from the mandrel 2.

  Subsequently, the release agent attached to the rubber hose 1 extracted from the mandrel 2 is washed (S5, S6: washing step). The mold release agent may adhere not only to the inner peripheral surface of the rubber hose 1 but also to the outer peripheral surface. Therefore, in the cleaning step, the release agent attached to the inner and outer peripheral surfaces of the rubber hose 1 is cleaned. In view of the influence on the fluid to be circulated when the rubber hose 1 is used, it is necessary to clean the release agent attached to the inner peripheral surface of the rubber hose 1. Further, in order to perform marking on the outer peripheral surface of the rubber hose 1, it is necessary to clean the release agent attached to the outer peripheral surface of the rubber hose 1.

  In the present embodiment, the cleaning process is performed by dividing it into a first cleaning process (S5) and a second cleaning process (S6). In the first cleaning step, most of the release agent is separated from the surface of the rubber hose 1. However, as will be described in detail later, this state includes a state where the molecules 61 of the release agent are attached to the surface of the rubber hose 1 via the water molecules 62.

  Further, in the second cleaning step, the release agent is completely separated from the surface of the rubber hose 1. As will be described in detail later, the release agent molecules 61 attached to the surface of the rubber hose 1 through the water molecules 62 are completely separated from the surface of the rubber hose 1.

  Subsequently, after the second cleaning step, the rubber hose 1 is dried (S7: drying step). That is, the water adhering to the rubber hose 1 is removed. Subsequently, marking is performed on the surface of the rubber hose 1 (S8: marking step). In the marking process, for example, a mark for specifying a circumferential position in the curved rubber hose 1 is attached. Subsequently, the shape of the rubber hose 1 is inspected (S9: inspection step).

(2. Types of release agents)
The release agent will be described. The mold release agent is a surfactant having a cloud point Tb. Release agents include, for example, polyalkylene glycols typified by polyethylene glycol, non-ionic surfactants typified by polyalkylene polyamine alkylene oxide adducts and polyoxyalkylene alkyl ethers, and fatty acid metal salts typified by fatty acid potassium. Solution. In the present embodiment, New Pole PE-62 manufactured by Sanyo Chemical Industries, Ltd. is used as a mold release agent.

  Further, the clouding point Tb of the release agent needs to be higher than the freezing point of water and lower than the boiling point of water. As will be described later, in the first cleaning step, the release agent is cleaned using water at a temperature lower than the cloud point Tb of the release agent, and in the second cleaning step, the cloud point of the release agent. This is because the mold release agent is washed using water having a temperature Tc higher than Tb. For example, a release agent having a cloud point Tb of 30 ° C. is used. A release agent having a specific gravity greater than that of water is used.

  Here, the property that the release agent has a cloud point Tb will be described with reference to FIG. FIG. 3 shows the relationship between the temperature of water containing the release agent and the affinity of the release agent and water. The state of the release agent is different before and after the temperature of the water containing the release agent is around the cloud point Tb. In the case of water having a temperature Ta lower than the cloud point Tb, the release agent has a high affinity for water. At this time, the micro-Brownian motion of the molecules of the release agent is reduced, and the water molecules are gathered near the hydrophilic groups of the molecules of the release agent, so that the release agent becomes water-soluble. On the other hand, in the case of water having a temperature Tc higher than the cloud point Tb, the release agent has a low affinity for water. At this time, the micro-Brownian motion of the release agent molecules becomes active, and the release agent molecules aggregate with each other without having an affinity for water.

(3. Washing and drying equipment)
The cleaning / drying apparatus will be described with reference to FIG. The cleaning / drying apparatus includes a first cleaning apparatus 10 that performs a first cleaning process, a second cleaning apparatus 30 that performs a second cleaning process, and a drying apparatus 50 that performs a drying process.

  The first cleaning device 10 includes a low temperature bath 11, a basket 12, a jet water flow device 14, and an air bubble device 15. The low temperature tank 11 stores water having a temperature Ta lower than the cloud point Tb of the release agent. For example, when the cloud point Tb of the release agent is 30 ° C., water at 12 ° C. that is sufficiently low temperature is stored in the low-temperature tank 11.

  The basket 12 is formed in a bowl shape whose upper side is opened by a net that can pass water. The basket 12 is formed in a size that can be placed in the cryostat 11. The basket 12 accommodates a plurality of rubber hoses 1 and is formed in a size that allows the rubber hose 1 to move sufficiently within the basket 12. The basket 12 is provided so as to be movable in the vertical direction inside and outside the low-temperature tank 11 by a driving device (not shown).

  The jet water flow device 14 generates a water flow for circulating the water in the low-temperature tank 11. In the present embodiment, the jet water flow device 14 is circulated in the direction toward the arrow in FIG. 4 between the shallow layer and the deep layer in the low temperature bath 11. The jet water flow device 14 includes a pump 14a, a jet port 14b, and a suction port 14c. The spout 14 b is disposed in a shallow layer in the low temperature tank 11 and jets water discharged from the pump 14 a in the horizontal direction of the low temperature tank 11. The suction port 14c is disposed in a deep layer in the low temperature tank 11 at a diagonal position of the jet outlet 14b, sucks water in the low temperature tank 11, and causes the pump 14a to suck it.

  The air bubble device 15 generates air bubbles upward from the deep layer side of the low-temperature tank 11. The air bubble device 15 includes an air supply source 15a and an air bubble outlet 15b. The air bubble ejection port 15b is disposed on the deep layer side of the low temperature bath 11, and ejects air supplied from the air supply source 15a in a bubble shape. One or more air bubble outlets 15 b are provided according to the width of the basket 12.

  The second cleaning device 30 includes a high temperature bath 31, a basket 32, an air bubble device 34, and a heating source 35. The high-temperature tank 31 stores water having a temperature Tc higher than the cloud point Tb of the release agent. For example, when the cloud point Tb of the release agent is 30 ° C., the high-temperature tank 31 stores 80 ° C. water having a sufficiently high temperature. The high temperature bath 31 is disposed in the vicinity of the low temperature bath 11 of the first cleaning device 10. That is, the high temperature bath 31 is disposed at a position where the rubber hose 1 in the basket 12 of the first cleaning device 10 can be easily transferred into the high temperature bath 31 of the second cleaning device 30 after the processing by the first cleaning device 10 is completed. Is done.

  The basket 32 is formed in a bowl shape whose upper side is opened by a net that can pass water. The basket 32 is formed in a size that can be placed in the high temperature bath 31. The basket 32 accommodates a plurality of rubber hoses 1 and is formed in a size that allows the rubber hose 1 to be sufficiently moved within the basket 32.

  The air bubble device 34 generates air bubbles upward from the deep layer side of the high-temperature bath 31. The air bubble device 34 includes an air supply source 34a and an air bubble outlet 34b. The air bubble ejection port 34b is disposed on the deep layer side of the high temperature bath 31, and ejects air supplied from the air supply source 34a in a bubble shape. One or a plurality of air bubble outlets 34 b are provided according to the width of the basket 32.

  The heating source 35 is a device for maintaining the water in the high temperature bath 31 at a high temperature Tc (80 ° C.). For example, the heat source 35 may have a configuration in which a heat exchanger is disposed in the high-temperature bath 31, or a heater itself may be disposed in the high-temperature bath 31. In the former case, for example, a configuration in which high-temperature steam is circulated through a pipe arranged in the high-temperature tank 31 may be adopted.

  The drying device 50 receives and dries the rubber hose 1 discharged from the second cleaning device 30. The drying device 50 is constituted by, for example, a conveyor 51 and is transported to a position where the marking process is processed. Here, the drying device 50 dries the water adhering to the second cleaning device 30 only by transporting the rubber hose 1 by the conveyor 51.

(4. Operation of washing and drying equipment)
The operation of the cleaning / drying apparatus will be described with reference to FIGS. The rubber hose 1 extracted from the mandrel 2 in the rubber hose extraction step (S4) is placed in the basket 12 of the first cleaning device 10. At this time, the basket 12 is located in the low temperature tank 11. A release agent is adhered to the surface of the rubber hose 1 extracted from the mandrel 2. Accordingly, as shown in FIG. 5A, in the initial stage of the first cleaning step, the release agent molecules 61 are directly attached to the surface of the rubber hose 1, and the water molecules 62 exist around the molecules.

  Here, in the first cleaning device 10, the jet water flow device 14 and the air bubble device 15 are driven, and the jet water flow and the air bubbles are generated in the low temperature tank 11. Accordingly, the water of low temperature Ta circulates in the low temperature tank 11 and becomes a uniform temperature throughout the low temperature tank 11. Further, the rubber hose 1 circulates in the basket 12 in the low temperature tank 11 while changing its posture by the jet water flow and the air bubbles.

  The water in the low temperature tank 11 is at a temperature Ta lower than the cloud point Tb of the release agent. Therefore, as shown in FIG. 3, the release agent has a high affinity for water in the low-temperature tank 11 and enters a water-soluble state. That is, when the first cleaning step proceeds, as shown in FIG. 5B, water molecules 62 are bonded around the release agent molecules 61, and the release agent molecules 61 are in a water-soluble state. . Furthermore, the release agent molecules 61 that are in a water-soluble state are separated from the surface of the rubber hose 1. However, a part of the molecule 61 of the release agent that has become water-soluble may be present on the surface of the rubber hose 1 through the water molecule.

  Here, in a 1st washing | cleaning process, the basket 12 is repeatedly moved in and out of the low temperature tank 11 by moving to an up-down direction with the drive device which is not shown in figure. That is, the rubber hose 1 repeatedly moves in and out of the low temperature tank 11. By moving the rubber hose 1 out of the low-temperature tank 11, low-temperature Ta water in which the molecules of the release agent existing in the rubber hose 1 are dissolved is discharged out of the rubber hose 1. Furthermore, by moving the rubber hose 1 from the outside of the low-temperature tank 11, new low-temperature Ta water can be reliably put into the rubber hose 1. Accordingly, the release agent molecules 61 in the rubber hose 1 are bonded to the water molecules 62 again, and the release agent molecules 61 are separated from the surface of the rubber hose 1.

  Subsequently, the rubber hose 1 is conveyed from the low temperature tank 11 of the first cleaning device 10 to the high temperature tank 31 of the second cleaning device 30. That is, the rubber hose 1 is once transferred from the basket 12 in the low-temperature tank 11 to the outside of the low-temperature tank 11 and then transferred into the basket 32 in the high-temperature tank 31.

  During conveyance from the low temperature tank 11 to the high temperature tank 31, water molecules 62 are attached to the surface of the rubber hose 1 as shown in FIG. Furthermore, a part of the release agent molecules 61 may be present on the surface of the rubber hose 1 via the water molecules 62. Since most of the release agent is cleaned in the first cleaning step, only a few release agent molecules 61 are present on the surface of the rubber hose 1 at this point. By sufficiently performing the processing of the first cleaning step, it is possible to prevent the release agent molecules 61 from being present in the rubber hose 1 conveyed to the second cleaning device 30.

  In the second cleaning device 30, the air bubble device 34 is driven, and air bubbles are generated in the high temperature bath 31. Therefore, the water of high temperature Tc flows in the high temperature tank 31 and becomes a uniform temperature throughout the high temperature tank 31. Furthermore, the attitude | position of the rubber hose 1 changes in the basket 32 in the high temperature tank 31 with an air bubble. Here, the basket 32 of the second cleaning device 30 continues to be placed in the high-temperature tank 31 until the second cleaning step is completed.

  The water in the high temperature bath 31 has a temperature Tc higher than the cloud point Tb of the release agent. Therefore, as shown in FIG. 3, the release agent has little affinity for the water in the high-temperature tank 31. That is, when the second cleaning step proceeds, as shown in FIG. 5D, the release agent molecules 61 aggregate with each other without having affinity with water molecules. Here, the release agent molecules 61 are not directly attached to the surface of the rubber hose 1 but are present via the water molecules 62. Therefore, the release agent molecules 61 are separated from the rubber hose 1 when they are aggregated. Since the specific gravity of the release agent molecules 61 is larger than that of water, the aggregated release agent molecules 61 move to the bottom surface of the high-temperature tank 31. In particular, the air bubble outlet 15 b is located at a position slightly away from the bottom surface of the high-temperature tank 31. Accordingly, the aggregated release agent molecules 61 are gradually deposited on the bottom surface of the high-temperature tank 31 without being lifted by the air bubbles.

  Further, the rubber hose 1 is present at a position away from the bottom of the high-temperature tank 31 by the basket 32 and at a position away from the bottom of the basket 32 by air bubbles. Therefore, when the aggregated release agent molecules 61 move away from the rubber hose 1 and move to the bottom surface of the high-temperature tank 31, they do not approach the rubber hose 1. Further, since the water in the high temperature tank 31 is at a high temperature Tc (80 ° C.), the rubber hose 1 existing in the high temperature tank 31 is gradually warmed.

  Subsequently, the rubber hose 1 is conveyed from the high-temperature tank 31 of the second cleaning device 30 onto the conveyor 51 of the drying device 50. In the initial stage of the drying step, water molecules 62 are attached to the surface of the rubber hose 1 as shown in FIG. Here, in the second cleaning step, the rubber hose 1 is warmed with water having a high temperature Tc. Therefore, the rubber hose 1 evaporates water on the surface of the rubber hose 1 by its own heat while being conveyed on the conveyor 51 of the drying device 50, and the water molecules 62 disappear as shown in FIG. . Accordingly, the release agent molecules 61 and water molecules 62 are not present on the surface of the rubber hose 1 in the drying device 50.

<Second embodiment>
In the method for manufacturing the rubber hose 1, the first cleaning device 110 shown in FIG. 6 may be used instead of the first cleaning device 10 in the first embodiment. The first cleaning device 110 includes a low temperature bath 11, a basket 112, and a driving device 113. The first cleaning device 110 does not include the jet water flow device 14 and the air bubble device 15 in the above embodiment.

  The basket 112 is formed in a bowl shape surrounding the entire periphery by a net that can pass water. The basket 12 accommodates a plurality of rubber hoses 1. The driving device 113 rotates the basket 112 and repeatedly moves it in and out of the low temperature bath 11 by moving up and down. That is, the rubber hose 1 repeatedly moves in and out of the low temperature tank 11 while changing the posture in the basket 112.

  When the first cleaning step is completed, the basket 112 is taken out from the low temperature tank 11 and the basket 112 is moved to the high temperature tank 31 while the rubber hose 1 is accommodated. Subsequently, the basket 112 is placed in the high temperature bath 31 and a second cleaning step is performed. At this time, in the high-temperature tank 31, as long as the release agent can be separated, the basket 112 may be swung or may not be swung. However, the release agent can be effectively separated by turning the basket 112.

<Effect of embodiment>
As described above, the method for manufacturing the rubber hose 1 includes a cleaning step (S5, S6) for cleaning the release agent in the rubber hose 1 to which the release agent for extracting the vulcanized rubber hose 1 from the mandrel 2 is attached. The release agent is a surfactant having a cloud point Tb, and is in a water-soluble state with respect to water having a low temperature Ta from the cloud point Tb. Moreover, a washing | cleaning process (S5, S6) is equipped with the 1st washing | cleaning process (S5) which wash | cleans the mold release agent adhering to the rubber hose 1 with the water of low temperature Ta from the cloud point Tb.

  As described above, the release agent is a surfactant that is in a water-soluble state with respect to water having a temperature lower than the cloud point Tb. In the first cleaning step (S5), water is simply used. However, water having a temperature Ta lower than the cloud point Tb is used. Since the release agent is in a water-soluble state in the presence of low temperature Ta water from the cloud point Tb, the release agent attached to the rubber hose 1 is separated from the rubber hose 1 by the low temperature Ta water. Therefore, the mold release agent adhering to the rubber hose 1 is washed only by using water having a temperature Ta lower than the cloud point Tb. That is, it is not necessary to use a detergent, and it is not necessary to use a high-pressure cleaning liquid. Therefore, the rubber hose 1 can be manufactured at low cost.

  Moreover, in the manufacturing method of the rubber hose 1, in the washing step (S 5, S 6), the rubber hose 1 after the first washing step (S 5) is put in the high-temperature tank 31 in which water having a temperature higher than the cloud point Tb is stored The second cleaning step (S6) is performed in which the release agent molecules 61 are aggregated via the water molecules 62 to separate the release agent from the rubber hose 1. Even if the release agent molecules 61 remain in the rubber hose 1 conveyed from the first cleaning step (S5), if the rubber hose 1 remains through the water molecules, the rubber hose 1 is placed in the high-temperature tank 31. The release agent molecules 61 can be aggregated in a state separated from the rubber hose 1. Accordingly, at the end of the second cleaning step (S6), the release agent molecules 61 can be completely separated from the rubber hose 1.

  Moreover, in the manufacturing method of the rubber hose 1, the second washing step (S <b> 6) puts the rubber hose 1 in the high temperature bath 31 while the low temperature Ta water in the first washing step (S <b> 5) is attached to the rubber hose 1. . Even when the release agent remains in the rubber hose 1 when transported from the first cleaning device 10, 110 to the second cleaning device 30, the release agent molecules 61 remain in the rubber hose 1 via the water molecules 62. Is maintained. Therefore, in the second cleaning device 30, the release agent can be reliably separated from the rubber hose 1.

  Moreover, the manufacturing method of the rubber hose 1 includes a drying step (S7) in which the rubber hose 1 is taken out from the high temperature bath 31 and dried by the heat warmed in the second cleaning step (S6). That is, in the drying step (S7), the heat in the second cleaning step (S6) is used. Thereby, it is not necessary to provide a dedicated heating device in the drying step (S7).

  Moreover, in the manufacturing method of the said rubber hose 1, a 1st washing | cleaning process (S6) moves the rubber hose 1 repeatedly in and out of the low temperature tank 11 which stores the water of low temperature Ta. By moving the rubber hose 1 out of the low temperature tank 11, low temperature Ta water in which the release agent existing in the rubber hose 1 is dissolved can be discharged out of the rubber hose 1. Further, by moving the rubber hose 1 from the outside of the low-temperature tank 11, new low-temperature Ta water can be reliably put into the rubber hose 1. Therefore, the high cleaning effect of the mold release agent in the rubber hose 1 can be obtained again.

  Moreover, in the manufacturing method of the rubber hose 1 of the first embodiment, the first cleaning step (S6) generates a jet water stream for circulating the low temperature Ta water in the low temperature tank 11 storing the low temperature Ta water, In addition, by generating air bubbles from the lower side of the low-temperature tank 11 toward the upper side, the rubber hose 1 is circulated in the low-temperature tank 11 and the posture is changed. Accordingly, the posture of the rubber hose 1 is changed while the rubber hose 1 is circulated in the low-temperature tank 11, and a high cleaning effect of the release agent attached to the rubber hose 1 can be obtained.

1: rubber hose, 2: mandrel, 10, 110: first cleaning device, 11: low temperature bath, 12, 112: basket, 14: jet water flow device, 15: air bubble device, 30: second cleaning device, 31: high temperature bath 32: Basket, 34: Air bubble device, 35: Heat source, 50: Drying device, 61: Molecule of release agent, 62: Water molecule, Ta: Temperature of water in low temperature tank, Tb: Cloud point, Tc: High temperature Tank water temperature

Claims (5)

A rubber hose manufacturing method comprising a cleaning step of cleaning the release agent in a rubber hose to which a release agent for extracting the rubber hose after vulcanization from a mandrel is attached,
The release agent is a surfactant having a cloud point, and is in a water-soluble state with respect to water having a temperature lower than the cloud point.
The washing step includes
A first cleaning step of cleaning the release agent directly attached to the surface of the rubber hose with water at a temperature lower than the cloud point ;
The rubber hose after the first washing step is put in a high-temperature tank in which water having a temperature higher than the cloud point is stored, and the mold release agent remaining in the rubber hose through water molecules by water having a temperature higher than the cloud point. A second washing step of aggregating molecules to separate the release agent from the rubber hose;
A method for manufacturing a rubber hose. 2. The method for manufacturing a rubber hose according to claim 1 , wherein, in the second cleaning step, the rubber hose is placed in the high-temperature tank while the low-temperature water in the first cleaning step is attached to the rubber hose. The method for manufacturing a rubber hose according to claim 1, wherein the method for manufacturing the rubber hose includes a drying step of drying the rubber hose by heat taken out from the high-temperature bath and heated in the second cleaning step. The said 1st washing | cleaning process is a manufacturing method of the rubber hose as described in any one of Claims 1-3 which moves the said rubber hose repeatedly in the inside and the outside of the low temperature tank which stores the said low temperature water. The first cleaning step generates a jet water flow for circulating the low-temperature water in a low-temperature tank storing the low-temperature water, and generates an air bubble from the lower side to the upper side of the low-temperature tank. , changing the attitude with circulating said rubber hose in said cold tank, a manufacturing method of a rubber hose according to any one of claims 1- 4.

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