JP2011075003A - Bending foamed rubber hose and method of manufacturing bending foamed rubber hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending foamed rubber hose excellent in thermal insulating properties in a simple structure and capable of being used for a piping system having a bent portion. <P>SOLUTION: The bending foamed rubber hose 11, having crank-like (two parts) bent portions 11a and 11b, includes a hollow inner rubber layer 21 that has the crank-like (two parts) bent portion, and a foaming outer rubber layer 41 integrally formed to a circumference of the inner rubber layer 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bent foamed rubber hose having at least one bent portion and excellent in heat insulation, and a method for manufacturing a bent foamed rubber hose.

  For example, hoses used for piping in cooling units of hydraulic machines and machine tools, piping for cooling water supply and drainage of molding machines and printing presses, etc., have thermal stability of the fluid (liquid, gas, etc.) flowing inside, It is necessary to secure and maintain fluid stability.

Therefore, in order to suppress (prevent) temperature rise or temperature drop under the influence of the atmosphere (temperature) surrounding the hose, a hose having heat insulation properties is used.
Also, when a cooled fluid is allowed to flow inside the hose, in order to prevent condensation from occurring on the outer surface of the hose and causing various problems due to water droplets, or when a heated fluid is allowed to flow inside the hose, the heated hose In order to prevent an operator or the like from accidentally contacting the outer surface to cause a burn or the like, a heat-insulating hose is used.

  When a hose having such a heat insulating property is used, the hose is inserted and bonded so that the inner peripheral surface of the cylindrical foam material is in close contact with the outer peripheral surface of the hose, or the foam material tape is attached to the outer surface of the hose. There has been proposed a method in which a hose is wound spirally without a gap, or a foam material similar in shape to a hose is covered on the outside of the hose.

  However, when the hose is provided with heat insulation by the above-described methods, various parts are required and the number of parts increases, and accordingly, movement between processes and complicated work processes are required. Increase and cost increase.

  Thus, a heat insulating hose having a simple configuration and excellent heat insulating properties has been proposed (see, for example, Patent Document 1).

JP 2005-188577 A

However, since the heat insulating hose is a linear hose, there is a problem that it cannot be used for a piping system having a bent portion.
Therefore, there is a demand for a bent foam rubber hose having heat insulation that can be used in a piping system having a bent portion.

  The present invention has been made to meet the above-described demands, and provides a bent foamed rubber hose that has a simple structure and is excellent in heat insulation and can be used in a piping system having a bent portion, and a method of manufacturing the bent foamed rubber hose. is there.

  The invention according to claim 1 is a bent foamed rubber hose having at least one bent portion, and is formed integrally with a hollow inner rubber layer having at least one bent portion and an outer periphery of the inner rubber layer. And a foamed outer rubber layer.

  The invention according to claim 2 is a bent foamed rubber hose having at least one bent portion, and is formed integrally with a hollow inner rubber layer having at least one bent portion and an outer periphery of the inner rubber layer. And a foamed outer rubber layer integrally formed on the outer periphery of the reinforcing layer.

  According to a third aspect of the present invention, in the bent foamed rubber hose according to the first or second aspect, grooves are provided around the outer periphery of both ends of the foamed outer rubber layer.

  Invention of Claim 4 is a manufacturing method of the bending foaming rubber | gum hose which has at least one bending part, Comprising: The foaming agent and the foaming auxiliary agent were contained in the outer periphery of the unvulcanized inner rubber layer formed hollow. A molding process for forming an unvulcanized outer rubber layer to form an unvulcanized rubber hose, and a bent mandrel having at least one bent portion is covered with the unvulcanized rubber hose, and the bent portion of the bent mandrel is covered with the unvulcanized portion. A step of covering with an inner rubber layer, the unvulcanized inner rubber layer as an inner rubber layer, the unvulcanized outer rubber layer is foamed into a foamed outer rubber layer, and the inner rubber layer and the foamed outer rubber A vulcanization molding step of integrating the layers into a bent foamed rubber hose, and a drawing step of pulling out the bent mandrel from the inner rubber layer.

  The invention according to claim 5 is a method for producing a bent foamed rubber hose having at least one bent portion, wherein a reinforcing layer is formed on the outer periphery of an unvulcanized inner rubber layer formed hollow, Forming an unvulcanized outer rubber layer containing a foaming agent and a foaming aid on the outer periphery to form an unvulcanized rubber hose, and covering the unvulcanized rubber hose on a bending mandrel having at least one bent portion Covering the bent portion of the bent mandrel with the unvulcanized inner rubber layer, forming the unvulcanized inner rubber layer into an inner rubber layer, and foaming the unvulcanized outer rubber layer into a foamed outer rubber layer And a vulcanization molding step in which the inner rubber layer, the reinforcing layer, and the foamed outer rubber layer are integrated to form a bent foamed rubber hose, and a drawing step of pulling out the bent mandrel from the inner rubber layer. Characterized in that it.

  According to a sixth aspect of the present invention, in the method of manufacturing the bent foamed rubber hose according to the fourth or fifth aspect, after the covering step, a foam suppression tool is attached to the outer periphery of both end portions of the unvulcanized outer rubber layer. It is characterized by providing a foaming suppressor attaching step.

According to the bent foamed rubber hose of the present invention, it has a simple structure and excellent heat insulation, and can be used for a piping system having a bent portion.
According to the method for manufacturing a bent foamed rubber hose of the present invention, the bent foamed rubber hose can be manufactured with a high production efficiency by a simple manufacturing process.

1 is a perspective view of a bent foam rubber hose according to a first embodiment of the present invention. It is process drawing which shows the manufacturing process of the bending foam rubber hose shown in FIG. It is sectional drawing of the unvulcanized rubber hose in the shaping | molding process shown in FIG. It is a perspective view of the bending mandrel used in the covering process shown in FIG. It is a perspective view of the unvulcanized rubber hose in the state which finished the covering process shown in FIG. It is a perspective view of the bending foam rubber hose which is 2nd Example of this invention. It is process drawing which shows the manufacturing process of the bending foam rubber hose shown in FIG. It is a perspective view of the unvulcanized rubber hose in the state which finished the foaming suppression tool attachment process shown in FIG. It is a perspective view of the bending foam rubber hose which is 3rd Example of this invention. It is sectional drawing of the unvulcanized rubber hose in the shaping | molding process which manufactures the bending foam rubber hose of 3rd Example. It is a perspective view of the bending mandrel used in the covering process which manufactures the bending foaming rubber hose of 3rd Example. It is a perspective view of the unvulcanized rubber hose in the state which completed the covering process which manufactures the bending foam rubber hose of 3rd Example. It is a perspective view of the bending foam rubber hose which is 4th Example of this invention. It is a perspective view of the unvulcanized rubber hose in the state which completed the foaming suppression tool attachment process which manufactures the bending foam rubber hose shown in FIG. It is explanatory drawing which shows the other shape of the bending foaming rubber hose of this invention. It is explanatory drawing which shows another shape of the bending foam rubber hose of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view of a bent foam rubber hose according to a first embodiment of the present invention, FIG. 2 is a process diagram showing a manufacturing process of the bent foam rubber hose shown in FIG. 1, and FIGS. 3 to 5 are manufacturing processes shown in FIG. It is explanatory drawing, such as an unvulcanized rubber hose and a bending mandrel in a process.

  In FIG. 1, a crank-shaped bent foamed rubber hose 11 having at least one, for example, two bent portions 11a and 11b, includes a hollow inner rubber layer 21 having crank-shaped (two) bent portions, The outer rubber layer 41 includes a foamed outer rubber layer 41 having crank-shaped (two places) bent portions 41 a and 41 b that are integrally formed on the outer periphery of the inner rubber layer 21.

The inner rubber layer 21 and the foamed outer rubber layer 41 are not particularly limited in materials. For example, ethylene-propylene copolymer rubber (EPM), ethylene-propylene-diene terpolymer rubber (EPDM), acrylic rubber ( ACM), chloroprene rubber (CR), chlorosulfonated polyethylene rubber, hydrin rubber, styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), isobutylene-isoprene copolymer rubber (IIR), natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), urethane rubber, silicone rubber, fluorine rubber and the like.
These rubber components can be used alone or in any blend of two or more, but considering heat insulation performance, heat resistance performance, ease of production, etc., ethylene-propylene-diene terpolymer rubber (EPDM) ), Chloroprene rubber (CR), or silicone rubber is preferably used.

In addition, as a foaming agent for forming the foamed outer rubber layer 41, for example, dinitrosopentamethylenetetramine (DPT), azodicarbonamide (ADCA), dinitrosopentastyrenetetramine, benzenesulfonylhydrazide, etc. in order to foam uniformly and efficiently. Derivatives, oxybisbenzenesulfonyl hydrazide (OBSH), ammonium bicarbonate generating carbon dioxide, sodium bicarbonate, ammonium carbonate, nitrososulfonylazo compound generating nitrogen, N, N′-dimethyl-N, N′-dinitroso Examples thereof include phthalamide, toluenesulfonyl hydrazide, P-toluenesulfonyl semicarbazide, P, P′-oxy-bis (benzenesulfonyl semicarbazide), and the like.
These foaming agents can be used alone or in any combination of two or more. However, in consideration of foamability, production suitability, etc., dinitrosopentamethylenetetramine (DPT), oxybisbenzenesulfonylhydrazide (OBSH) are used. It is preferable to use it.

Further, as the foaming auxiliary agent for forming the foamed outer rubber layer 41, for example, urea, zinc stearate, zinc benzenesulfinate, zinc white etc. may be mentioned in order to foam uniformly and efficiently in combination with the foaming agent. Can do.
These foaming aids can be used alone or in any combination of two or more, but urea is preferably used.

Next, the production of the bent foam rubber hose 11 will be described with reference to FIGS.
First, as shown in FIG. 3, an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming auxiliary agent is extruded simultaneously with the unvulcanized inner rubber layer 21A on the outer periphery of a hollow unvulcanized inner rubber layer 21A. The unvulcanized rubber hose 11A is formed by forming an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming auxiliary agent on the outer periphery of the unvulcanized inner rubber layer 21A, which is an unvulcanized rubber hose 11A. (Molding step S1).

  Since the unvulcanized rubber hose 11A molded in this way is usually molded in a long shape, the unvulcanized rubber hose has a length of, for example, 300 mm to 400 mm so as to be the length of the bent foam rubber hose 11 to be manufactured. 11A is cut (cutting step S2).

  Next, a bent mandrel 51 having two bent portions 51a and 51b bent in a crank shape is prepared, for example, as shown in FIG. A water-soluble release agent is applied to the outer surface of the mandrel 51 (release agent application step S3).

  Then, if necessary, after preheating the unvulcanized rubber hose 11A, for example, at 120 ° C. for 15 minutes (preheating step S4), as shown in FIG. 5, the bending mandrel 51 is covered with the unvulcanized rubber hose 11A, The bent portions 51a and 51b are covered with the unvulcanized inner rubber layer 21A of the unvulcanized rubber hose 11A (covering step S5).

  Next, the unvulcanized rubber hose 11A is placed in a pressureless or atmospheric pressure vulcanizer together with the bent mandrel 51, and vulcanized at 150 ° C. for 30 minutes, for example, to thereby convert the unvulcanized inner rubber layer 21A into the inner rubber layer 21. In addition, the unvulcanized outer rubber layer 41A is made into the foamed outer rubber layer 41 and integrated with the inner rubber layer 21, and the unvulcanized rubber hose 11A is made into the bent foamed rubber hose 11 (vulcanization molding step S6).

  Then, the bent foamed rubber hose 11 shown in FIG. 1 can be obtained by taking out the bent foamed rubber hose 11 together with the bent mandrel 51 from the vulcanizer and pulling out the bent mandrel 51 from the inner rubber layer 21 (drawing step S7).

As described above, according to the first embodiment of the present invention, it is possible to obtain the bent foamed rubber hose 11 which has a simple configuration and excellent heat insulation and can be used in a piping system having a bent portion.
Further, the bent foamed rubber hose 11 can be manufactured with a simple manufacturing process with high production efficiency.

  FIG. 6 is a perspective view of a bent foam rubber hose according to a second embodiment of the present invention, FIG. 7 is a process diagram showing a manufacturing process of the bent foam rubber hose shown in FIG. 6, and FIG. It is a perspective view of the unvulcanized rubber hose in the state which finished the process.

In FIG. 6, the crank-shaped bent foamed rubber hose 12 having at least one, for example, two bent portions 12a and 12b, includes a hollow inner rubber layer 21 having crank-shaped (two) bent portions, The outer rubber layer 42 is formed of a crank-shaped (two places) bent portions 42a and 42b formed integrally on the outer periphery of the inner rubber layer 21.
A circumferential groove (locking groove) 42c is provided on the outer periphery of both ends of the foamed outer rubber layer 42.

As the material for the inner rubber layer 21 and the foamed outer rubber layer 42 in this embodiment, the materials described in the paragraph [0021] can be used.
And what was demonstrated by the paragraph [0022] can be used for a foaming agent.
Moreover, what was demonstrated in paragraph [0023] can be used for a foaming adjuvant.

Next, the production of the bent foam rubber hose 12 will be described with reference to FIGS.
First, as shown in FIG. 3, an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming auxiliary agent is extruded simultaneously with the unvulcanized inner rubber layer 21A on the outer periphery of a hollow unvulcanized inner rubber layer 21A. The unvulcanized rubber hose 11A is formed by forming an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming auxiliary agent on the outer periphery of the unvulcanized inner rubber layer 21A, which is an unvulcanized rubber hose 11A. (Molding step S11).

  Since the unvulcanized rubber hose 11A molded in this way is usually molded in a long shape, the unvulcanized rubber hose has a length of, for example, 300 mm to 400 mm so as to be the length of the bent foam rubber hose 12 to be manufactured. 11A is cut (cutting step S12).

  Next, a bent mandrel 51 having the shape of the bent foamed rubber hose 12 to be manufactured, for example, as shown in FIG. 4 and having two bent portions 51a and 51b bent in a crank shape, is prepared and bent as necessary. A water-soluble release agent is applied to the outer surface of the mandrel 51 (release agent application step S13).

  Then, if necessary, after preheating the unvulcanized rubber hose 11A, for example, at 120 ° C. for 15 minutes (preheating step S14), as shown in FIG. 5, the bending mandrel 51 is covered with the unvulcanized rubber hose 11A, The bent portions 51a and 51b are covered with the unvulcanized inner rubber layer 21A of the unvulcanized rubber hose 11A (covering step S15).

  Next, as shown in FIG. 8, a foam suppression tool, for example, a metal foam suppression jig 61 is attached to the outer periphery of both ends of the unvulcanized outer rubber layer 41A (foaming suppression tool mounting step S16).

Then, the unvulcanized rubber hose 11A is put together with the bending mandrel 51 in a pressureless or atmospheric pressure vulcanizer, and vulcanized at 150 ° C. for 30 minutes, for example, so that the unvulcanized inner rubber layer 21A becomes the inner rubber layer 21. At the same time, the unvulcanized outer rubber layer 41A is made into a foamed outer rubber layer 42 and integrated with the inner rubber layer 21, and the unvulcanized rubber hose 11A is made into a bent foamed rubber hose 12 (vulcanization molding step S17).
In this vulcanization molding step S17, foaming of the unvulcanized outer rubber layer 41A where the foam suppression jig 61 is attached is suppressed, and the groove 42c is formed.

  Next, the bent foam rubber hose 12 is taken out from the vulcanizer together with the bent mandrel 51 and the foam suppression jig 61 is removed (foam suppressor removal step S18), and then the bent mandrel 51 is pulled out from the inner rubber layer 21. (Drawing-out process S19), the bending foam rubber hose 12 shown in FIG. 6 can be obtained.

According to the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained.
Since the foamed outer rubber layer 42 (the bent foamed rubber hose 12) has the groove 42c, the bent foamed rubber hose 12 can be firmly attached to the pipe by accommodating a fastener in the groove 42c.

  FIG. 9 is a perspective view of a bent foam rubber hose according to a third embodiment of the present invention, and FIGS. 10 to 12 are explanatory views of an unvulcanized rubber hose, a bent mandrel and the like in the manufacturing process of the bent foam rubber hose shown in FIG. .

  In FIG. 9, the crank-shaped bent foamed rubber hose 13 having at least one, for example, two bent portions 13a and 13b, includes a hollow inner rubber layer 21 having a crank-shaped (two locations) bent portion, A reinforcing layer 31 having a crank-shaped (two places) bent portion integrally formed on the outer periphery of the inner rubber layer 21 and a crank-shaped (two places) bent integrally formed on the outer periphery of the reinforcing layer 31 It is comprised by the foaming outer rubber layer 41 which has the parts 41a and 41b.

As the material of the inner rubber layer 21 and the foamed outer rubber layer 41 in this embodiment, the materials described in the paragraph [0021] can be used.
And what was demonstrated by the paragraph [0022] can be used for a foaming agent.
Moreover, what was demonstrated in paragraph [0023] can be used for a foaming adjuvant.

The material and structure of the reinforcing layer 31 are not particularly limited, but it is preferable to use a fiber material considering that the reinforcing performance can be effectively imparted while maintaining flexibility and lightness. Examples thereof include fibers, nylon fibers, polyphenylene sulfide fibers, aramid fibers, polynosic fibers, vinylon fibers, polyethylene terephthalate fibers, and polyethylene naphthalate fibers.
These fibers can be used alone or in any combination of two or more, but it is preferable to use polyethylene terephthalate fibers in view of heat insulation shrinkage, durability and the like.

Next, the production of the bent foam rubber hose 13 will be described with reference to FIGS. 2 and 9 to 12.
First, as shown in FIG. 10, a braid is braided as a reinforcing layer 31 on the outer periphery of the hollow unvulcanized inner rubber layer 21A, and a foaming agent and a foaming auxiliary agent are added to the outer periphery of the reinforcing layer 31. The vulcanized outer rubber layer 41A is extruded at the same time as the unvulcanized inner rubber layer 21A to form an unvulcanized rubber hose 13A, or the blade is braided as a reinforcing layer 31 on the outer periphery of the hollow unvulcanized inner rubber layer 21A. After knitting, an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming aid is formed on the outer periphery of the reinforcing layer 31 to form an unvulcanized rubber hose 13A (molding step S1).

  Since the unvulcanized rubber hose 13A molded in this way is usually molded in a long shape, the unvulcanized rubber hose has a length of, for example, 300 mm to 400 mm so as to be the length of the bent foam rubber hose 13 to be manufactured. 13A is cut (cutting step S2).

  Next, a bent mandrel 51 having two bent portions 51a and 51b bent in a crank shape, for example, as shown in FIG. 11, having the shape of the bent foam rubber hose 13 to be manufactured, is prepared and bent as necessary. A water-soluble release agent is applied to the outer surface of the mandrel 51 (release agent application step S3).

  Then, if necessary, after preheating the unvulcanized rubber hose 13A at 120 ° C. for 15 minutes (preheating step S4), as shown in FIG. 12, the bending mandrel 51 is covered with the unvulcanized rubber hose 13A, The bent portions 51a and 51b are covered with the unvulcanized inner rubber layer 21A of the unvulcanized rubber hose 13A (covering step S5).

  Next, the unvulcanized rubber hose 13A is placed in a pressureless or atmospheric pressure vulcanizer together with the bent mandrel 51 and vulcanized at, for example, 150 ° C. for 30 minutes, whereby the unvulcanized inner rubber layer 21A is converted into the inner rubber layer 21. In addition, the unvulcanized outer rubber layer 41A is made into the foamed outer rubber layer 41 and integrated with the inner rubber layer 21 and the reinforcing layer 31, and the unvulcanized rubber hose 13A is made into the bent foamed rubber hose 13 (vulcanization molding step S6). .

  Then, the bent foamed rubber hose 13 shown in FIG. 9 can be obtained by taking out the bent foamed rubber hose 13 together with the bent mandrel 51 from the vulcanizer and pulling out the bent mandrel 51 from the inner rubber layer 21 (drawing step S7).

  According to the third embodiment of the present invention, the same effect as that of the first embodiment can be obtained.

  FIG. 13 is a perspective view of a bent foam rubber hose according to a fourth embodiment of the present invention, and FIG. 14 is a perspective view of an unvulcanized rubber hose in a state in which a foam suppressor mounting step for manufacturing the bent foam rubber hose shown in FIG. It is.

In FIG. 13, the crank-shaped bent foamed rubber hose 14 having at least one, for example, two bent portions 14a and 14b, includes a hollow inner rubber layer 21 having crank-shaped (two) bent portions, A reinforcing layer 31 having a crank-shaped (two places) bent portion integrally formed on the outer periphery of the inner rubber layer 21 and a crank-shaped (two places) bent integrally formed on the outer periphery of the reinforcing layer 31 It is comprised with the foaming outer rubber layer 42 which has the parts 42a and 42b.
A circumferential groove (locking groove) 42c is provided on the outer periphery of both ends of the foamed outer rubber layer 42.

As the material for the inner rubber layer 21 and the foamed outer rubber layer 42 in this embodiment, the materials described in the paragraph [0021] can be used.
And what was demonstrated by the paragraph [0022] can be used for a foaming agent.
Moreover, what was demonstrated in paragraph [0023] can be used for a foaming adjuvant.
Furthermore, the material described in the paragraph [0045] can be used as the material of the reinforcing layer 31.

Next, the production of the bent foam rubber hose 14 will be described with reference to FIGS. 7 and 10 to 14.
First, as shown in FIG. 10, a braid is braided as a reinforcing layer 31 on the outer periphery of the hollow unvulcanized inner rubber layer 21A, and a foaming agent and a foaming auxiliary agent are added to the outer periphery of the reinforcing layer 31. The vulcanized outer rubber layer 41A is extruded at the same time as the unvulcanized inner rubber layer 21A to form an unvulcanized rubber hose 13A, or the blade is braided as a reinforcing layer 31 on the outer periphery of the hollow unvulcanized inner rubber layer 21A. After knitting, an unvulcanized outer rubber layer 41A containing a foaming agent and a foaming aid is formed on the outer periphery of the reinforcing layer 31 to form an unvulcanized rubber hose 13A (molding step S11).

  Since the unvulcanized rubber hose 13A molded in this way is usually molded in a long shape, the unvulcanized rubber hose has a length of, for example, 300 mm to 400 mm so as to be the length of the bent foam rubber hose 14 to be manufactured. 13A is cut (cutting step S12).

  Next, a bent mandrel 51 having two bent portions 51a and 51b bent in a crank shape is prepared, for example, as shown in FIG. A water-soluble release agent is applied to the outer surface of the mandrel 51 (release agent application step S13).

  Then, if necessary, after preheating the unvulcanized rubber hose 13A, for example, at 120 ° C. for 15 minutes (preheating step S14), as shown in FIG. 12, the bending mandrel 51 is covered with the unvulcanized rubber hose 13A, The bent portions 51a and 51b are covered with the unvulcanized inner rubber layer 21A of the unvulcanized rubber hose 13A (covering step S15).

  Next, as shown in FIG. 14, a foam suppression tool, for example, a metal foam suppression jig 61 is attached to the outer periphery of both ends of the unvulcanized outer rubber layer 41 </ b> A (foam suppression tool mounting step S <b> 16).

Then, the unvulcanized rubber hose 13A is put together with the bending mandrel 51 in a pressureless or atmospheric pressure vulcanizer, and vulcanized at 150 ° C. for 30 minutes, for example, so that the unvulcanized inner rubber layer 21A becomes the inner rubber layer 21. At the same time, the unvulcanized outer rubber layer 41A is made into the foamed outer rubber layer 42 and integrated with the inner rubber layer 21 and the reinforcing layer 31, and the unvulcanized rubber hose 13A is made into the bent foamed rubber hose 14 (vulcanization molding step S17).
In this vulcanization molding step S17, foaming of the unvulcanized outer rubber layer 41A where the foam suppression jig 61 is attached is suppressed, and the groove 42c is formed.

  Next, the bent foam rubber hose 14 is taken out from the vulcanizer together with the bent mandrel 51 and the foam suppression jig 61 is removed (foam suppressor removal step S18), and then the bent mandrel 51 is pulled out from the inner rubber layer 21. (Drawing-out process S19), the bending foam rubber hose 14 shown in FIG. 13 can be obtained.

  According to the fourth embodiment of the present invention, the same effect as that of the second embodiment can be obtained.

In the above-described embodiment, an example in which the number of the bent portions of the bent foam rubber hose is two was shown. However, if the number of the bent portions is one or more, even if it is the L-shaped bent foam rubber hose shown in FIG. Alternatively, the U-shaped bent foamed rubber hose shown in FIG. 16 may be used, but it is necessary to use a bent mandrel having bent portions corresponding to the number of bent portions of the bent foamed rubber hose.
In addition, although an example in which a single layer of fiber is woven is used as a reinforcing layer, a reinforcing layer is formed by braiding a plurality of layers of fibers, a reinforcing layer is formed by braiding fibers in a rubber layer, A reinforcing layer may be formed by providing a plurality of layers in which fibers are knitted, or a reinforcing layer may be formed by stacking different layers.
Moreover, although the example which comprised the foaming outer rubber layer only by the one foaming outer rubber layer was shown, the foaming outer rubber layer was comprised by the foaming outer rubber layer part and the at least one outer rubber layer part, The foamed outer rubber layer portion may be positioned on the outermost side.
Moreover, although the example which provided the cutting process which cut | disconnects an unvulcanized rubber hose to predetermined length was shown, when manufacturing the unvulcanized rubber hose of predetermined length, a cutting process can be skipped.
Moreover, although the example which provided the foam suppression tool removal process before the drawing process was shown, when a foam control tool can be used as a fixture, a foam suppression tool removal process may be omitted, and foam control A tool removing step may be provided after the drawing step.

11-14 Bent foam rubber hose 11A, 13A Unvulcanized rubber hose 11a, 11b Bend part 13a, 13b Bend part 21 Inner rubber layer 21A Unvulcanized inner rubber layer 31 Reinforcement layer 41, 42 Foamed outer rubber layer 41A Unvulcanized outer rubber Layer 41a, 41b Bent part 42a, 42b Bent part 42c Groove (locking groove)
51 Bending mandrels 51a, 51b Bending parts 61 Foam suppression tool (foaming suppression jig)

Claims (6)

A bent foamed rubber hose having at least one bent portion,
A hollow inner rubber layer having at least one bent portion;
Having a foamed outer rubber layer integrally formed on the outer periphery of the inner rubber layer,
A bent foam rubber hose characterized by that. A bent foamed rubber hose having at least one bent portion,
A hollow inner rubber layer having at least one bent portion;
A reinforcing layer integrally formed on the outer periphery of the inner rubber layer;
A foam outer rubber layer integrally formed on the outer periphery of the reinforcing layer;
A bent foam rubber hose characterized by that. In the bent foam rubber hose according to claim 1 or 2,
Provided with a groove around the outer periphery of both ends of the foamed outer rubber layer,
A bent foam rubber hose characterized by that. A method for producing a bent foamed rubber hose having at least one bent portion,
A molding step of forming an unvulcanized outer rubber layer containing a foaming agent and a foaming auxiliary agent on the outer periphery of the hollow unvulcanized inner rubber layer to form an unvulcanized rubber hose,
Covering the unvulcanized rubber hose with a bent mandrel having at least one bent portion, and covering the bent portion of the bent mandrel with the unvulcanized inner rubber layer;
The unvulcanized inner rubber layer is used as an inner rubber layer, the unvulcanized outer rubber layer is foamed into a foamed outer rubber layer, and the inner rubber layer and the foamed outer rubber layer are integrated to be bent and foamed. Vulcanization molding process to make rubber hose,
A drawing step of drawing the bending mandrel from the inside rubber layer.
A method for producing a bent foam rubber hose characterized by the above. A method for producing a bent foamed rubber hose having at least one bent portion,
A reinforcing layer is formed on the outer periphery of the hollow unvulcanized inner rubber layer, and an unvulcanized outer rubber layer containing a foaming agent and a foaming auxiliary agent is formed on the outer periphery of the reinforcing layer. Molding process to
Covering the unvulcanized rubber hose with a bent mandrel having at least one bent portion, and covering the bent portion of the bent mandrel with the unvulcanized inner rubber layer;
The unvulcanized inner rubber layer is used as an inner rubber layer, the unvulcanized outer rubber layer is foamed into a foamed outer rubber layer, and the inner rubber layer, the reinforcing layer, and the foamed outer rubber layer are integrated. Vulcanization molding process to be bent foam rubber hose,
A drawing step of drawing the bending mandrel from the inside rubber layer.
A method for producing a bent foam rubber hose characterized by the above. In the manufacturing method of the bending foam rubber hose according to claim 4 or 5,
After the covering step, a foam suppression tool mounting step for attaching a foam suppression tool to both ends of the unvulcanized outer rubber layer was provided.
A method for producing a bent foam rubber hose characterized by the above.

Images