JP2003127243A - Manufacturing method for pneumatic fender - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a pneumatic fender which enables manufacture of the pneumatic fender being longer than a molding drum by using a conventional molding drum. SOLUTION: Rubber sheet materials and reinforcing layers of an outer layer rubber 2, a fibrous reinforcing layer 3, an inner layer rubber 4, etc., are stuck together sequentially on the molding drum 1 in a cantilever state, and a mirror 5 on one side of the main body of the fender and a direct body 6 extending to about a half of the length of the direct body of the fender are molded. The terminal 6a of the direct body 6 being turned over to a prescribed length, the inner layer rubber 4, the fibrous reinforcing layer 3 and the outer layer rubber 2 are connected to the terminal 6a, and a remaining direct body 6x are molded. Then, the mirror 5a on the other side of the main body of the fender is molded and an unvulcanized molded article thus obtained is removed from the molding drum 1. This molded article is set thereafter in a vulcanizing mold M similar to a conventional one and vulcanized under the internal pressure by injecting a fluid W into the nuvulcanized molded article T. After vulcanization molding is completed, the article is removed from the mold M. Thus, the pneumatic type fender about twice as long as the molding drum 1 can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pneumatic fender, and more particularly to a method for manufacturing a pneumatic fender that uses a conventional molding drum and is longer than the length of the molding drum. It is about the method.

[0002]

2. Description of the Related Art Conventionally, for example, the applicant of the present invention has proposed a method for producing a pneumatic fender by sequentially laminating a rubber sheet material and a reinforcing layer on a cantilevered molding drum. JP-A-60-143940 is known.

This conventional manufacturing method is described in the above publication.
2A to 2C, a rubber sheet material such as the outer rubber layer 2, the fiber reinforcing layer 3, and the inner rubber layer 4 and the reinforcing layer are sequentially laminated on the cantilevered molding drum 1. The entire length of the one mirror portion 5 and the straight body portion 6 of the fender body is molded (see FIG. 2A).

Next, as shown in FIG. 2 (b), the end portion of the straight body portion 6 is inverted up to the vicinity of one mirror portion 5 to form the other mirror portion 5 (FIG. 2 (c)). reference). After that, FIG.
As shown in (a) to (c), the above-mentioned unvulcanized molded product T is removed from the molding drum 1 while injecting the fluid W into the inside thereof, and then disposed in the vulcanizing mold M to Sulfur mold M
The vulcanization molding was performed by heating from the outside, and after the vulcanization was completed, the work of removing the molded product from the vulcanization mold M was performed.

[0005]

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 forming drum 1. Therefore, in order to manufacture a longer pneumatic fender, the forming drum 1
Had to lengthen the length of.

However, the molding drum shaft 1a for rotating the molding drum 1 has to be a cantilever structure for molding the mirror portion 5 of the molding drum 1 as shown in FIG. 3 (a).
Therefore, when the long forming drum 1 is manufactured, there is a problem that the cost is increased and the cost is increased.

An object of the present invention is to provide a method of manufacturing a pneumatic fender which can manufacture a pneumatic fender having a length longer than that of a conventional molding drum. .

[0008]

In order to achieve the above-mentioned object, the present invention has a rubber drum material and a reinforcing layer which are sequentially laminated on a molding drum to form one mirror portion and a straight body portion of a fender body. Part of, and after inverting the end portion of the straight body portion, the rubber sheet material and the reinforcing layer are connected to the end portion to form the remaining straight body portion, and then the fender body main body After molding the other mirror part, remove the unvulcanized molded product molded in this way from the molding drum, place it in the vulcanization mold, and remove it from the vulcanization mold after vulcanization molding is completed. It is a summary.

By such a manufacturing process, it is possible to manufacture a pneumatic fender that is longer than the length of the forming drum and is about twice as long as the conventional forming drum.

In addition, after molding one mirror portion and a part of the straight body portion of the fender body, a release sheet is wound and the remaining straight body portion is formed on the release sheet. Thus, it is possible to effectively prevent the inner layer rubber from rubbing when it is removed from the molding drum.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

The same components as those of the conventional example and the structure of the vulcanization mold M are designated by the same reference numerals and the description thereof will be omitted.

1 (a) to 1 (d) are explanatory views of the manufacturing process of a pneumatic fender according to the present invention, which is manufactured by the following processes.

First, as shown in FIG. 1A, a rubber sheet material such as an outer rubber layer 2, a fiber reinforcing layer 3 and an inner rubber layer 4 and a reinforcing layer are sequentially laminated on a cantilevered molding drum 1, The straight body portion 6 is formed to a length of about half the length of the mirror portion 5 and the straight body portion of the fender body.

Next, the terminal portion 6a of the straight body portion 6 is inverted to a predetermined length (a length at which the remaining half of the straight body portion 6 can be connected) (see FIG. 1 (b)), and the terminal The inner layer rubber 4, the fiber reinforcing layer 3, and the outer layer rubber 2 are connected to the portion 6a to mold the remaining straight body portion 6x (see FIG. 1C).

Fiber reinforced layer 3 molded in FIG. 1 (c)
Has a peripheral length slightly longer than that of the fiber-reinforced layer 3 molded in FIG. 1 (a). Therefore, when air is applied to the finished product to apply internal pressure, the product of the part molded in FIG. 1 (c) The diameter may be slightly larger. This irregular diameter is shown in Figure 1.
From the orientation angle of the fiber of the fiber reinforcing layer formed in (c) with respect to the axis 1a of the forming drum 1, the orientation angle of the fiber of the fiber reinforcing layer 3 formed in FIG. It can be solved by increasing it by 1 to 5 degrees.

Fiber Reinforcement Layer 3 Molded on Molding Drum 1
The diameter before reversal is preferably 0.9 to 1 times the diameter of the fiber reinforced layer 3 of the product after vulcanization, and in that case, the orientation angle of the fiber of the fiber reinforced layer 3 with respect to the axis of the molding drum 1 is: 47 degrees
55 degrees is desirable.

Thereafter, as shown in FIG. 1 (d), the other mirror portion 5a of the fender body is molded, and the unvulcanized molded product thus molded is removed from the molding drum 1 and is not shown. It is disposed in a vulcanization mold M similar to that in the conventional example (see FIGS. 3A to 3C), and a fluid W is injected into the inside of the unvulcanized molded article T to vulcanize by applying internal pressure. . After the vulcanization molding is completed, the vulcanization mold M is removed. By this method,
It is possible to manufacture a pneumatic fender having a length about twice the length of the forming drum 1.

Further, since the pneumatic fender in the embodiment of the present invention is longer than the straight body portion 6 of the conventional pneumatic fender, it is not vulcanized when the molded product is removed from the molding drum 1. The inner rubber layer 4 is longer and rubs more strongly. Therefore,
In order to prevent this, after molding one mirror part 5 and a part of the straight body part 6 of the fender body, the inner layer rubber 4 of the straight body part 6 is formed.
A sheet such as a polyethylene sheet for releasing is wound on the above, the remaining straight body portion 6x is formed thereon, and then the other mirror portion 5a is formed, and the sheet is formed under the interposition of the sheet. The work can be smoothly performed by removing it from the drum 1.

[0020]

As described above, according to the present invention, the rubber sheet material and the reinforcing layer are sequentially laminated on the forming drum to form one mirror portion and a part of the straight body portion of the fender body. After inverting the end of the straight body, connect the rubber sheet material and the reinforcing layer to the end to form the remaining straight body, and then form the other mirror of the fender body. Then, after removing the unvulcanized molded product molded in this way from the molding drum, it was placed in the vulcanization mold, and after vulcanization molding was completed, it was removed from the vulcanization mold. It has an excellent effect. (a). A molding fender having the same length as the conventional one can be used to manufacture a pneumatic fender having a length about twice that of the conventional one. (b). The manufacturing cost of a long pneumatic fender molding machine can be reduced. (c). A single molding machine can produce pneumatic fenders of various lengths.

[Brief description of drawings]

1 (a) to 1 (d) are half cross-sectional explanatory views of a manufacturing process of a pneumatic fender embodying the present invention.

2A to 2C are half cross-sectional explanatory views of a conventional manufacturing process of a pneumatic fender.

3 (a) to 3 (c) are explanatory views of a conventional vulcanization process for a pneumatic fender.

[Explanation 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 6 Straight body part 6a Terminal part 6x Remaining straight body T Unvulcanized molded product W fluid M mold

Claims (3)

[Claims] 1. A method for producing a pneumatic fender by sequentially laminating a rubber sheet material and a reinforcing layer on a cantilevered forming drum, wherein a rubber sheet material and a reinforcing layer are sequentially formed on the forming drum. After laminating, one mirror part of the fender body and a part of the straight body part are molded, and after inverting the terminal part of the straight body part, the rubber sheet material and the reinforcing layer are connected to the terminal part. The remaining straight body part, then the other mirror part of the fender body is molded, and the unvulcanized molded product molded in this way is removed from the molding drum and then placed in the vulcanization mold. Then, after the vulcanization molding is completed, a method for manufacturing a pneumatic fender that is removed from the vulcanization mold. 2. When forming the remaining straight body portion, the orientation angle of the fiber of the fiber reinforcing layer forming the remaining straight body portion with respect to the molding drum axis is set to the fiber forming a part of the straight body portion. The method for manufacturing a pneumatic fender according to claim 1, wherein the fiber of the reinforcing layer is larger than the orientation angle of the fiber with respect to the axis of the forming drum by 0.1 to 5 degrees. 3. A mold release sheet is wound after forming one mirror portion and a part of the straight body portion of the fender body, and the remaining straight body portion is formed on the release sheet. Item 3. A method for manufacturing the pneumatic fender according to Item 1 or 2.