JPS6141782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a belt-shaped hollow body used as an oil fence or the like.

[Prior art]

Conventionally, belt-shaped hollow bodies such as floating oil fences require the formation of an airtight chamber or air chamber inside, so when molding them, a sheet-like material such as polyester resin film that is not vulcanized and bonded to rubber is used. A core is used. However, since the presence of this core becomes an obstacle to air intake and exhaust into the airtight chamber, it is necessary to remove it from the band-shaped hollow body during the manufacturing process, but removing this core is difficult and extremely time-consuming. However, when wrapping the inner wall component (inner layer rubber) around this core during the manufacturing process and molding it, there are problems such as the fact that the surface of the core lacks adhesiveness with the rubber, making molding extremely difficult. .

Therefore, instead of using a core, for example,
As described in Japanese Patent No. 14882, there is also a method of applying a mold release agent for forming a hollow part, such as a liquid mold release agent or a low-temperature melting mold release agent, to the surface corresponding to the inner surface of the hollow body of the inner layer rubber.

However, with this method, when applying the mold release agent, if there is uneven application, local mold release defects will occur after vulcanization, and the hollow parts will locally adhere. Not only is a very high degree of uniformity required upon application of the agent, but when the mold release agent contains a solvent, there are also problems such as the need for a heating device to dry the solvent.

In order to solve the above-mentioned problems, the inventors of the present invention
The band-shaped hollow body constituent members are sequentially laminated and surrounded in a sheet-shaped molding core made by laminating a plurality of unvulcanized rubber sheets with different adhesive properties to form an unvulcanized band-shaped molded body, and then the unvulcanized rubber sheets are laminated and surrounded. The vulcanized strip-shaped molded body is vulcanized, and then a pressurizing medium is applied between the layers of the sheet-shaped molding core or between one side of the sheet-shaped molded core and the innermost layer of the vulcanized strip-shaped molded body. Inventing an innovative method for manufacturing a band-shaped hollow body in which a hollow part is formed by press-fitting and peeling off any of the layers,
An application has already been filed (see Japanese Patent Application No. 78747/1983).

However, when this type of hollow belt-shaped body is not in use, it takes on a flat belt-like shape as shown in Figure 1, so when it is used, air is forced into the airtight chamber to expand the airtight chamber into a cylindrical shape. However, as shown in Figure 2, there are creases a left on both sides of the airtight chamber from the bent parts when not in use, and stress concentrates on these creases a under pressure, causing cracks, etc. However, there is a risk that the airtightness of the band-shaped hollow body will be impaired. This risk is of course the same in the band-shaped hollow body formed by the conventional method described above, and also in the band-shaped hollow body having the two-chamber structure shown in FIG. 3. In FIG. 1, reference numeral 2 denotes a hollow inner rubber layer which is an inner wall constituent member.A reinforcing cloth rubber sheet 3 is placed around the inner rubber layer 2, and an outer rubber layer 4 is provided on the outside thereof. Figure 2 shows the hollow part of the band-shaped hollow body in Figure 1, that is, the airtight chamber 1.
This shows the state in which air is pressurized. FIG. 3 shows a state in which air is pressurized into the airtight chamber 1 formed by the inner layer rubber 2 and air is also pressurized into the airtight chamber 1' formed by the inner layer rubber 2'. 5 is an adjustment sheet.

[Purpose of invention]

An object of the present invention is to provide an excellent belt-shaped hollow body that eliminates the above-mentioned problems.

[Structure of the idea]

Therefore, in the present invention, in a band-shaped hollow body that takes on a flat band shape when not in use and forms a substantially cylindrical airtight chamber 1 when in use, the airtight chamber 1 is provided with two inner wall constituent members 2a and 2b that are not bonded to each other. This superimposed two
A non-adhesive bent overlapping portion is formed by folding both ends of the inner wall constituent members 2a and 2b to one side at positions corresponding to both ends m and m' of the band-shaped hollow body when not in use. The gist is the characteristic band-shaped hollow body.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 4 is a cross-sectional view of a belt-shaped hollow body having a one-chamber structure according to an example of the present invention when in use, and FIGS. 5A to 5D are explanatory views showing the manufacturing process of this belt-shaped hollow body.
FIG. 6 is a cross-sectional view of another example of the belt-shaped hollow body having a two-chamber structure according to the present invention when in use, and FIGS. 7A to 7G are explanatory diagrams showing the manufacturing process of this belt-shaped hollow body.

In FIG. 4 and FIG. 6, E ₁ and E ₂ are belt-shaped hollow bodies with a one-chamber structure and a two-chamber structure, respectively, which are examples of the present invention, and when not in use, they take on a flat strip shape, and when in use, they have an almost flat shape. It has an airtight chamber 1 that is deformed into a cylindrical shape. The airtight chamber 1 consists of two inner wall components 2a and 2b that are not adhered to each other and are stacked on top of each other.
Bend E ₁ and E ₂ at positions corresponding to both ends m and m', that is, at the corresponding bending part Ea, and form a folded mating surface Fa and a non-adhesive folded overlapping part having this Fa in this folded part. It consists of: The term "non-adhesive" as used herein means, for example, that the folded surfaces Fa are not integrally fixed to each other via an adhesive or the like. 6th
The hermetic chamber 1' in the figure may be formed in the same manner as the hermetic chamber 1.

Furthermore, to explain the band-shaped hollow body of the present invention with reference to FIG. 4, after vulcanization, the inner surfaces of the inner wall constituent members 2a and 2b are not bonded to each other as shown in the figure, and the outer surface of the inner wall constituent member 2a is made of reinforced cloth rubber. The outer surfaces of the sheet 3 and the inner wall component 2b are integrally bonded to the adjustment sheet 5, respectively. Therefore, when air is forced into the airtight chamber 1 during use, the inner wall members 2a, 2b mutually bulge outward as shown in FIG. 4, and the whole is deformed into a cylindrical shape.

In order to check the bonding force of the folded mating surface Fa, an internal pressure fracture test was performed by applying an internal pressure of about 0.1 Kg/cm ² to a band-shaped hollow body E ₁ with an inner diameter of 400 mm. The peeling occurred by ~10 mm, and no abnormality was observed in the fold mark a of the folded portion, that is, the folded portion Ea. On the other hand, in the conventional belt-shaped hollow body shown in FIG. 2 having an inner diameter of 400 mm, the crease mark a was easily destroyed by an internal pressure of about 0.1 kg/cm ² .

Next, the manufacturing process of the belt-shaped hollow body _E1 having a one-chamber structure shown in FIG. 4 will be briefly described with reference to FIGS. 5A to 5D.

First, as shown in FIG. 5A, the surfaces of the two unvulcanized inner wall components 2a and 2b that do not adhere to each other after vulcanization are placed one on top of the other, and both sides are folded back to one side as shown in the figure. After forming Fa, as shown in FIG. 5B, adjustment sheets 5 are filled between the left and right folded mating surfaces Fa, and as shown in FIGS. 5B and 5C, these adjustment sheets 5 and the inner wall configuration are A reinforcing cloth rubber sheet 3 is placed around the member 2a, and its surface is further covered with an unvulcanized outer rubber layer 4 as shown in FIG. Accordingly, the band-shaped hollow body _E1 having the one-chamber structure described above can be obtained.

The manufacturing process of the band-shaped hollow body _E2 having a two-chamber structure consisting of the airtight chamber 1 and the airtight chamber 1' shown in FIG.
This will be briefly explained with reference to Figures A to G.

First, as shown in FIG. 7A, two unvulcanized inner wall members 2a ₁ and 2 are used to form an airtight chamber 1'.
After vulcanization of b ₁ , the surfaces that do not adhere to each other are placed one on top of the other, and the periphery thereof is surrounded by a reinforcing cloth rubber sheet 6 as shown in FIGS. 7A and 7B. Next, in order to form the airtight chamber 1 as shown in FIG. 7C, the surfaces of the two unvulcanized inner wall constituent members 2a and 2b that are not bonded to each other after vulcanization are overlapped, as shown in FIG. 7D. After folding both sides to one side to form a folded mating surface Fa, as shown in FIG.
Fill it with. Thereafter, as shown in FIGS. 7E and 7F, the reinforcing cloth rubber sheet 3 is placed around the adjustment sheet 5 and the inner wall component 2a, and the surface thereof is unvulcanized as shown in FIG. 7G. After covering with the outer layer rubber 4, the above-mentioned two-chamber structure band-shaped hollow body is obtained by vulcanizing it with a vulcanization press or the like in this state.
You can get _E2 .

A band-shaped hollow body E ₂ with a two-chamber structure shown in Fig. 6
In order to check the bonding force of the folded mating surface Fa, after applying an internal pressure of about 0.1 kg/cm ² to a band-shaped hollow body E ₂ with an inner diameter of 400 mm with caps (not shown) attached to both longitudinal ends, The following tests were conducted.

(1) Destruction experiment in which the same pressure was applied to both airtight chamber 1 and airtight chamber 1' at the same time.

(2) Destruction experiment by applying pressure only to airtight chamber 1.

(3) Destruction experiment by applying pressure only to airtight chamber 1'.

(4) Experiment in which water pressure of 5Kg → 0 → 5Kg was applied repeatedly to airtight chamber 1 and airtight chamber 1′ 2000 times.

(5) Apply water pressure of 5Kg → 0 → 5Kg only to airtight room 1 to 2000
The experiment was repeated several times.

(6) Apply water pressure of 5Kg→0→5Kg only to airtight chamber 1′.
The experiment was repeated 2000 times.

As a result, the folded joint surface Fa between the airtight chamber 1 and the airtight chamber 1' was peeled off by 5 to 10 mm in the circumferential direction, and there was a crease mark a at the bent part, that is, the corresponding part of the bent part.
No abnormality was observed in Ea.

In addition, although cracks were partially observed in the bent portion b of the airtight chamber 1', it was found that the internal pressure of the airtight chamber 1' did not flow into the airtight chamber 1, and that airtightness could be maintained sufficiently.

In addition, through each experiment described above, the bending length l of the bending surface Fa at the bending portion Ea
It was confirmed that a value of 10 mm is sufficient, but considering the degree of difficulty in manufacturing, it is desirable that the value is 100 mm or more and approximately 1/6 or less of the circumference of the airtight chamber.

As described above, when forming the band-shaped hollow bodies E ₁ and E ₂ , the inner wall constituent members of the airtight chamber 1 are made by polymerizing the surfaces of the two unvulcanized inner wall constituent members 2 a and 2 b that are not bonded together after vulcanization. After molding and vulcanizing the belt-shaped hollow body, there is no need to remove the core as in conventional materials. However, if they do not adhere to each other, the inner wall constituent members 2a and 2b may be constructed from conventional materials. Of course, you can. Furthermore, it goes without saying that a pressurized liquid may be pressurized or fed into the airtight chamber 1 instead of a gas such as air.

[Effect of idea]

Because of the configuration described above, in the belt-shaped hollow body of the present invention, the concentrated stress acting on the creases of the folded portion during use, that is, when pressurized, can be absorbed by the non-bonded portion in the circumferential direction. can be sufficiently dispersed. In addition, when the folded and overlapped parts are not made non-adhesive, that is, when the mating surfaces of the folded and overlapped parts are fixed together, the first
As shown in the figure, it is flat when not in use, so even if it is expanded into a cylindrical shape by injecting air during use, i.e. when pressurized, creases a remain at the folded part when not in use, as shown in Figure 2. In addition, since no stress dispersion means is provided, this crease a will be largely displaced under pressure and stress will be concentrated, so there is a risk that cracks will occur from there and the airtightness will be impaired. Therefore, in the present invention, there is a great advantage that the folded and polymerized portion is not bonded.

Therefore, according to the present invention, it is possible to reliably prevent cracks, etc. from occurring from the folded part where the fold marks remain when not in use, toward the outer periphery of the band-shaped hollow body. It can maintain its properties for a long period of time.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a belt-shaped hollow body with a single-chamber structure when not in use, Figure 2 is a cross-sectional view of a conventional belt-shaped hollow body with a single-chamber structure when in use, and Figure 3 is a cross-sectional view of a conventional two-chamber hollow belt body. FIG. 3 is a sectional view of the belt-shaped hollow body in use. Fig. 4 is a cross-sectional view of an example of the present invention when a band-shaped hollow body with a one-air chamber structure is in use, and Fig. 5A-
D is an explanatory diagram showing the manufacturing process of this belt-shaped hollow body, FIG. 6 is a cross-sectional view of another example of the belt-shaped hollow body with a two-chamber structure of the present invention when in use, and Figures 7 A to G are this belt-shaped hollow body. It is an explanatory diagram showing a manufacturing process of the body. 1, 1'...Airtight room, 2, 2', 2a, 2b, 2
a ₁ , 2b ₁ ... Inner wall component, 3 ... Reinforcement cloth rubber sheet, 4 ... Outer layer rubber, 5 ... Adjustment sheet, 6 ...
...Reinforced cloth rubber sheet, m, m'...both ends of the band-shaped hollow body, Ea...bending area, Fa...bending mating surface.

Claims (1)

[Scope of utility model registration request] In a band-shaped hollow body that has a flat band shape when not in use and forms a substantially cylindrical airtight chamber when in use, the airtight chamber is constructed by overlapping two inner wall constituent members that are not bonded to each other, and the overlapping A band-shaped hollow body characterized in that both ends of two inner wall constituent members are folded back to one side at positions corresponding to both ends of the band-shaped hollow body when not in use to form a non-adhesive folded overlapping part. .