JP3868259B2 - Manufacturing method of pneumatic fender - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a pneumatic fender, and more particularly to a production method for producing a pneumatic fender longer than the length of a molding drum using a conventional molding drum.
[0002]
[Prior art]
Conventionally, as a method for producing a pneumatic fender by sequentially laminating a rubber sheet material and a reinforcing layer on a cantilever-shaped molding drum, for example, Japanese Patent Application Laid-Open No. Sho-60- No. 143940 is known.
[0003]
This conventional manufacturing method includes the outer layer rubber 2, the fiber reinforcing layer 3, the inner layer rubber 4 and the like on the molding drum 1 in a cantilever state as described in the above publication and FIGS. The rubber sheet material and the reinforcing layer are sequentially laminated, and the entire length of one mirror part 5 and the straight body part 6 of the fender body is formed (see FIG. 2A).
[0004]
Next, as shown in FIG. 2B, the terminal part of the straight body part 6 is inverted to the vicinity of the one mirror part 5 to form the other mirror part 5 (see FIG. 2C). Thereafter, as shown in FIGS. 3A to 3C, the unvulcanized molded product T is removed from the molding drum 1 while injecting the fluid W into the molding drum 1, and then placed in the vulcanizing mold M. It was installed and heated from the outside of the vulcanization mold M to perform vulcanization molding. After the vulcanization was completed, the molded product was removed from the vulcanization mold M.
[0005]
[Problems to be solved by the invention]
However, in such a conventional manufacturing method, the maximum length of the pneumatic fender that can be manufactured is limited by the length of the molding drum 1. Therefore, in order to manufacture a longer pneumatic fender, it is necessary to increase the length of the forming drum 1.
[0006]
However, the molding drum shaft 1a for rotating the molding drum 1 must be a cantilever structure for molding the mirror portion 5 of the molding drum 1 as shown in FIG. However, there was a problem that the cost and cost increased.
[0007]
An object of the present invention is to provide a method for manufacturing a pneumatic fender capable of producing a pneumatic fender having a length longer than that of the forming drum using a conventional forming drum.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention forms one mirror part of the fender body and a part of the straight body part by sequentially laminating a rubber sheet material and a reinforcing layer on one molding drum. After reversing the end portion of the straight body portion, a rubber sheet material and a reinforcing layer are connected to the end portion, and the remaining straight body portion is molded so as to overlap the already formed straight body portion , After that, the other mirror part of the fender body is formed on the end of the remaining straight body part , and the unvulcanized molded product thus formed is removed from the molding drum and then placed in the vulcanization mold. After the vulcanization molding is completed, the gist is to remove from the vulcanization mold.
[0009]
By such a manufacturing process, it is possible to manufacture a pneumatic fender having a length approximately twice as long as the length of the forming drum using a conventional forming drum.
[0010]
In addition, after molding one mirror part of the fender body and a part of the straight body part, a release sheet is wound on the formed straight body part, and the remaining straight part is wound on the sheet. By molding the body portion, it is possible to effectively prevent the inner layer rubber from being rubbed when removed from the molding drum.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0012]
In addition, the same code | symbol is attached | subjected to the structure of the same component and vulcanization mold M as a prior art example, and description is abbreviate | omitted.
[0013]
1 (a) to 1 (d) are explanatory views of a manufacturing process of a pneumatic fender according to the present invention, which are manufactured by the following processes.
[0014]
First, as shown in FIG. 1 (a), a rubber sheet material such as an outer layer rubber 2, a fiber reinforcing layer 3 and an inner layer rubber 4 and a reinforcing layer are sequentially laminated on a molding drum 1 in a cantilever state, and a fender is formed. The body part 6 is formed to a length of about half of the length of the mirror part 5 and the body part of the main body.
[0015]
Next, the terminal portion 6a of the straight body portion 6 is inverted to a predetermined length (a length to which the remaining half of the straight body portion 6 can be connected) (see FIG. 1B), and the terminal portion 6a The inner layer rubber 4, the fiber reinforcement layer 3, and the outer layer rubber 2 are connected to form the remaining straight body portion 6x (see FIG. 1C).
[0016]
The fiber reinforcing layer 3 formed in FIG. 1C is formed to have a slightly longer circumference than the fiber reinforcing layer 3 formed in FIG. 1A. Therefore, when air is applied to the finished product and internal pressure is applied. In some cases, the diameter of the product of the part molded in FIG. The unevenness of the diameters means that the orientation angle of the fibers of the fiber reinforcing layer formed in FIG. 1C with respect to the axis 1a of the forming drum 1 is the same as that of the fiber forming drum 1 of the fiber reinforcing layer 3 formed in FIG. This can be solved by increasing the orientation angle relative to the axis 1a by 0.1 to 5 degrees.
[0017]
The diameter of the fiber reinforcement layer 3 formed on the molding drum 1 before inversion is preferably 0.9 to 1 times the diameter of the fiber reinforcement layer 3 of the vulcanized product. The orientation angle of the fibers with respect to the axis of the forming drum 1 is preferably 47 to 55 degrees.
[0018]
Thereafter, as shown in FIG. 1 (d), the other mirror portion 5a of the fender body is molded, and after the unvulcanized molded product thus molded is removed from the molding drum 1, a conventional example (not shown) 3 (a) to 3 (c)) is disposed in a vulcanization mold M similar to that shown in FIG. 3 (a), and a fluid W is injected into the unvulcanized molded product T to vulcanize by applying an internal pressure. After the vulcanization molding is completed, the vulcanization mold M is removed. By this method, a pneumatic fender having a length approximately twice the length of the forming drum 1 can be produced.
[0019]
In addition, since the pneumatic fender in the embodiment of the present invention is longer than the straight body portion 6 of the conventional pneumatic fender, when the molded product is removed from the molding drum 1, the unvulcanized inner rubber 4 Is longer and rubs harder. Therefore, in order to prevent this, after molding a part of the mirror part 5 and the straight body part 6 of the fender body, a polyethylene sheet or the like for release on the inner layer rubber 4 of the straight body part 6 The remaining straight body portion 6x is formed thereon, and then the other mirror portion 5a is formed and removed from the forming drum 1 under the presence of the sheet, thereby smoothly Work can be done.
[0020]
【The invention's effect】
This invention, as described above, on one molding drum, the rubber sheet material and the reinforcing layer are sequentially laminated to form one mirror part of the fender body and a part of the straight body part, After reversing the terminal part of the straight body part, a rubber sheet material and a reinforcing layer are connected to the terminal part, and the remaining straight body part is molded so as to overlap on the already formed straight body part , and then The other mirror part of the fender body is formed on the end of the remaining straight body part , and the unvulcanized molded product thus formed is removed from the molding drum and then placed in the vulcanization mold. Since the vulcanization molding is completed and then removed from the vulcanization mold, the following excellent effects are exhibited.
(a) By using a molding drum having the same length as the conventional one, a pneumatic fender having a length approximately twice as long as that of the conventional one can be manufactured.
(b) The production cost of a long pneumatic fender molding machine can be reduced.
(c) Pneumatic fenders of various lengths can be manufactured with one molding machine.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 (a) to (d) are half-sectional explanatory views of a manufacturing process of a pneumatic fender according to the present invention.
FIGS. 2A to 2C are half cross-sectional explanatory views of a manufacturing process of a conventional pneumatic fender. FIG.
FIGS. 3A to 3C are explanatory views of a conventional vulcanization process of a pneumatic fender. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molding drum 1a Shaft of molding drum 2 Outer layer rubber 3 Fiber reinforcement layer 4 Inner layer rubber 5,5a Mirror part 6 Straight body part 6a Terminal part 6x Remaining straight body part T Unvulcanized molded product W Fluid M Mold

Claims (3)

On forming drum one cantilever, combined sequentially bonded rubber sheet material and reinforcing layer in a method of manufacturing a pneumatic fender, on the forming drum, sequentially laminating the rubber sheet material and a reinforcing layer one of the mirror portion of the fender body Te, and by forming a portion of the cylindrical body portion, said after inverting the terminal portion of the straight body portion, said connecting rubber sheet material and the reinforcing layer in the terminal portion The remaining straight body part is molded so as to be superimposed on the already formed straight body part , and then the other mirror part of the fender body is formed at the end of the remaining molded straight body part in this way. A method for producing a pneumatic fender, wherein a molded unvulcanized molded product is removed from a molding drum, then placed in a vulcanization mold, and after vulcanization molding is completed, the molded product is removed from the vulcanization mold. When forming the remaining straight body part, the fiber reinforcement layer constituting a part of the already formed straight body part is set so that the orientation angle of the fibers of the fiber reinforcement layer constituting the remaining straight body part with respect to the molding drum axis is set. The method for producing a pneumatic fender according to claim 1, wherein the fiber is 0.1 to 5 degrees larger than the orientation angle of the fibers with respect to the molding drum axis. After molding one mirror part of the fender main body and a part of the straight body part, a release sheet is wound on the formed straight body part, and the remaining straight body part is wound thereon. The manufacturing method of the pneumatic fender of Claim 1 or 2 which shape | molds.

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