JP2014124791A - Method for producing rubber tube and production device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a rubber tube in which dimensions and shape are stabilized.SOLUTION: The method for producing a rubber tube comprises: a step of inserting an un-crosslinked rubber tube G into a cylindrical member 20; a step of flowing heating steam into the rubber tube G to expand and crosslink the rubber tube G, and pressing the same against the inner wall of the cylindrical member 20; and a step of removing the heating steam from the inside of the rubber tube G to shrink the rubber tube G, and releasing the same from the inner wall of the cylindrical member 20.

Description

  The present invention relates to a method and an apparatus for manufacturing a rubber tube, and more particularly to a technique for improving the stability of dimensions and shape.

  Rubber tubes are widely used as hoses for water supply or flammable gases. Since the rubber tube has moderate elasticity, it can be easily deformed. For this reason, it is used for various purposes not limited to the above-mentioned purposes.

  The raw rubber that is the raw material of the rubber tube has almost no elasticity like that of generally known rubber. Crosslinking is known as a method of adding elasticity to this raw rubber (see, for example, Patent Document 1). Crosslinking is a method of adding required elasticity to rubber by adding sulfur or the like to raw raw rubber and heating it. In the case of crosslinking a rubber tube, a method is known in which sulfur or the like is added to raw rubber, processed into a desired shape by extrusion, and then transferred to an electric furnace or the like and heated (see, for example, Patent Document 2).

JP 2009-145665 A (paragraph numbers [0005] to [0009]) JP 05-314823 A (paragraph numbers [0017] to [0023])

  The rubber tube manufacturing method described above has the following problems. That is, in the method of transferring to an electric furnace or the like, heating, and crosslinking, the rubber tube is crosslinked in a state where it is not physically constrained, and thus is crosslinked in a deformed state due to its own weight or the like. For this reason, there existed a problem that dispersion | variation produced in the dimension and shape of the rubber tube after bridge | crosslinking.

  Then, this invention aims at providing the manufacturing method and manufacturing apparatus of a rubber tube from which the rubber tube with a stable dimension and shape is obtained.

  In order to solve the above problems and achieve the object, the rubber tube manufacturing method and manufacturing apparatus of the present invention are configured as follows.

  The rubber tube manufacturing method of the present invention includes a step of inserting an uncrosslinked rubber tube into a cylindrical member, a high temperature fluid flowing into the rubber tube to expand and crosslink the rubber tube, and the cylinder A step of pressing the inner wall of the cylindrical member, and a step of removing the heating fluid from the inside of the rubber tube to contract the rubber tube and releasing from the inner wall of the cylindrical member.

  The rubber tube manufacturing apparatus of the present invention is a rubber tube manufacturing apparatus for cross-linking an uncrosslinked rubber tube, and a cylindrical member that coaxially houses the rubber tube, and one end side of the cylindrical member The rubber tube is attachable / detachable and communicates with the inside of the rubber tube in a liquid-tight / air-tight manner, and is provided on the other end side of the cylindrical member, and closes the rubber tube. A blocking portion; a supply portion for supplying a high temperature fluid; a flow channel communicating with the attachment / detachment portion; and a passage between the flow passage and the supply portion. The high temperature fluid is supplied from the supply portion to the attachment / detachment portion. An inflow path to be guided, an inflow side valve section provided in the inflow path for opening and closing the inflow path, an outflow path communicating with the flow path and discharging the high-temperature fluid from the attachment / detachment section, and the outflow path Opening and closing the outflow passage And a outflow-side valve unit that performs.

  According to the present invention, it is possible to manufacture a rubber tube having a stable size and shape.

The front view which shows typically the manufacturing apparatus of the rubber tube to which the manufacturing method of the rubber tube which concerns on one embodiment of this invention is applied. The longitudinal cross-sectional view which shows the principal part of the manufacturing apparatus of the rubber tube. Explanatory drawing which shows typically the manufacturing process of the rubber tube using the manufacturing apparatus of the rubber tube. The longitudinal cross-sectional view which shows the principal part of the modification of the manufacturing apparatus of the rubber tube.

  FIG. 1 is a front view schematically showing a rubber tube manufacturing apparatus 10 for carrying out a rubber tube manufacturing method according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of the rubber tube manufacturing apparatus 10. It is the longitudinal cross-sectional view shown. In FIG. 1, G represents a rubber tube, Ga represents one end of the rubber tube G, and Gb represents the other end of the rubber tube G.

  The rubber tube manufacturing apparatus 10 includes a cylindrical member 20 that coaxially accommodates the rubber tube G, and one end portion 21 side of the cylindrical member 20, and the one end portion Ga of the rubber tube G is liquid-tight. The airtightly closed closing portion 30, the attaching / detaching portion 40 provided on the other end 22 side of the tubular member 20, the tubular flow channel 50 communicating with the attaching / detaching portion 40, and heating steam (high temperature fluid) Is provided between the boiler 60 and the flow path 50 and the boiler 60, and a cylindrical inflow path 70 that guides the heated steam from the boiler 60 to the flow path 50, and the flow path 50. And a cylindrical outflow passage 90 for discharging the heating steam.

  The cylindrical member 20 includes a release part 110 made of a material such as resin that can easily release the rubber tube G, and a fiber part 120 that is installed in close contact with the outer periphery of the release part 110. The release part 110 has a concavo-convex shape 111 continuously formed over the entire inner peripheral part thereof.

  The detachable portion 40 is cylindrical, and one end 41 of the detachable portion 40 is detachable from the end Gb of the rubber tube G, and is communicated with the inside of the rubber tube G in a liquid-tight and air-tight manner. The other end 42 of the detachable portion 40 communicates with the flow path 50 in a liquid-tight and air-tight manner. The detachable portion 40 is provided with a main valve portion 45 and has a function of sealing the inside of the rubber tube G.

  The inflow path 70 is provided with an inflow side valve portion 80 and has a function of controlling the inflow of heating steam by opening and closing the inflow path 70.

  The outflow passage 90 is provided with an outflow side valve portion 100 and has a function of controlling the outflow of the heating steam by opening and closing the outflow passage 90.

  Next, the manufacturing process of a rubber tube is demonstrated. FIG. 3 is an explanatory view schematically showing a process of manufacturing a rubber tube. Components other than the rubber tube G and the cylindrical member 20 are omitted. The detachable portion 40, the inflow passage 70, and the outflow passage 90 are closed by the main valve portion 45, the inflow side valve portion 80, and the outflow side valve portion 100, respectively.

  First, the uncrosslinked rubber tube G is accommodated coaxially inside the cylindrical member 20. The first step in FIG. 3 shows a state where the uncrosslinked rubber tube G is accommodated in the cylindrical member 20. Here, one end portion Ga of the rubber tube G is covered with the closing portion 30, and the detachable portion 40 is attached to the other end portion Gb of the rubber tube G so that the inside of the rubber tube G and the inflow path 70 are communicated.

  Next, the main valve part 45 and the inflow side valve part 80 are opened, heating steam is caused to flow into the rubber tube G from the boiler 60, the rubber tube G is expanded and heated, and is pressed against the inner peripheral part of the tubular member 20. Crosslink. The 2nd process in FIG. 3 has shown a mode that the uncrosslinked rubber tube G is bridge | crosslinked. The inflow side valve portion 80 and the main valve portion 45 are closed while the rubber tube G is pressed against the inner peripheral portion of the cylindrical member 20, and the state where the rubber tube G is inflated is maintained.

  After the required time has elapsed, the main valve portion 45 and the outflow side valve portion 100 are opened to discharge the heating steam from the inside of the rubber tube G. The third step in FIG. 3 shows a state in which the heating steam is discharged from the inside of the rubber tube G.

  Next, the blocking portion 30 and the detachable portion 40 are removed from the rubber tube G, and the rubber tube G is taken out from the cylindrical member 20. The fourth step in FIG. 3 shows the rubber tube G that has been subjected to the crosslinking treatment and has been taken out from the cylindrical member 20. With this, the manufacturing process of the rubber tube G according to the present embodiment is completed.

  According to the rubber tube manufacturing apparatus 10 according to the present embodiment, the rubber tube G is expanded and heated, and the shape of the rubber tube G is fixed by pressing the rubber tube G against the inner peripheral portion of the cylindrical member 20. Cross-linking can be performed in a state in which the rubber tube G is cross-linked, and the size and shape of the rubber tube G after cross-linking can be stabilized. Further, by using a material such as resin that can easily release the rubber tube G for the release part 110 of the cylindrical member 20, the rubber tube G after crosslinking can be easily taken out from the cylindrical member 20. be able to. Moreover, by covering the mold release part 110 with the fiber part 120, the deformation of the cylindrical member 20 due to the expansion of the rubber tube G can be suppressed, and the size and shape of the rubber tube G after crosslinking can be further stabilized. it can.

  As described above, according to the present invention, a rubber tube having a stable shape and dimensions can be manufactured by injecting and bridging a high-temperature fluid into the rubber tube while the rubber tube is accommodated in the cylindrical member. It becomes possible.

  FIG. 4 is a longitudinal sectional view showing a cylindrical member 20A of a modification of the rubber tube manufacturing apparatus 10 described above. 4, the same functional parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The cylindrical member 20 </ b> A includes a release part 110 </ b> A made of a material that can easily release the rubber tube G, such as resin, and a fiber part 120. 110 A of mold release parts have the uneven | corrugated shape 111A intermittently formed in the inner peripheral part whole surface, and the linear pattern (pattern) 112A formed along the axial direction.

  According to this modification, it is possible to obtain the same effects as those of the rubber tube manufacturing apparatus 10 according to the embodiment described above.

  As described above, according to the present invention, a rubber tube having a stable shape and dimensions can be manufactured by injecting and bridging a high-temperature fluid into the rubber tube while the rubber tube is accommodated in the cylindrical member. It becomes possible.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the cylindrical member 20 includes the release part 110 and the fiber part 120. However, the present invention can be similarly applied even when these are formed of a metal material or the like. In the above-described example, the heating steam flows in and out from one end of the rubber tube. However, the present invention can be applied to the case where the inflow and outflow are performed from separate ends. The pattern formed on the inner peripheral surface is not limited to the linear pattern described above, and even if it is a curve or a character, the effect of the present invention can be obtained.

  Of course, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Rubber tube manufacturing apparatus, 20, 20A ... Cylindrical member, 30 ... Closure part, 40 ... Detachment part, 45 ... Main valve part, 50 ... Flow path, 60 ... Boiler (supply part), 70 ... Inflow path, 80 ... Inflow side valve part, 90 ... Outflow part, 100 ... Outflow side valve part, 110, 110A ... Mold release part, 120 ... Fiber part, G ... Rubber tube.

Claims (4)

Inserting an uncrosslinked rubber tube into the inside of the cylindrical member;
Injecting a high temperature fluid into the rubber tube to expand and bridge the rubber tube, and pressing the inner wall of the cylindrical member;
Removing the high-temperature fluid from the inside of the rubber tube to shrink the rubber tube and releasing it from the inner wall of the cylindrical member.   2. The method of manufacturing a rubber tube according to claim 1, wherein the cylindrical member is formed of a resin and has a stretchable fiber member that covers at least a part of the outer periphery of the cylindrical member in close contact. .   The method for manufacturing a rubber tube according to claim 1, wherein the cylindrical member has a concavo-convex shape or a pattern on at least a part of an inner periphery thereof. In a rubber tube manufacturing apparatus for crosslinking an uncrosslinked rubber tube,
A cylindrical member that coaxially accommodates the rubber tube;
An attachment / detachment portion provided on one end side of the cylindrical member, detachable from the rubber tube, and in fluid-tight and air-tight communication with the inside of the rubber tube;
A closing portion that is provided on the other end side of the cylindrical member and closes the rubber tube;
A supply section for supplying a high-temperature fluid;
A flow path communicating with the detachable portion;
An inflow path that is provided between the flow path and the supply section and guides the high-temperature fluid from the supply section to the detachable section;
An inflow side valve portion that is provided in the inflow path and opens and closes the inflow path;
An outflow path communicating with the flow path and discharging the high-temperature fluid from the attachment / detachment portion;
An apparatus for manufacturing a rubber tube, comprising: an outflow side valve portion that is provided in the outflow path and opens and closes the outflow path.

Images