JP3513810B2 - Rubber bag - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oil fence,
The present invention relates to a rubber bag body used for rubber dams, floating sediment cages, and the like.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
This type of rubber bag body comprises a band-shaped rubber, a non-adhesive zone provided in the band-shaped rubber for supplying and discharging fluid, and a reinforcing canvas surrounding the non-adhesive zone and provided in the band-shaped rubber. In general, the non-adhesive zone is filled with a fluid such as air to sufficiently expand the non-adhesive zone before use.

However, when a fluid is supplied to the non-adhesive zone and the rubber layer swells, stress concentrates on both ends of the non-adhesive zone, and a crack runs on the rubber layer at both ends.
If it was pulled, the reinforcing canvas might peel off, resulting in puncture from the cracked portion.

In view of such a problem, a slit is provided along the reinforcing canvas at a position outside the reinforcing canvas and corresponding to the end portion of the non-adhesive zone, and the slit is connected to the atmosphere. A rubber bag is known (Japanese Utility Model Publication No. 63-32180).

In the rubber bag having the above structure, even if a crack is formed in the rubber layer, the fluid leaking from the crack is discharged into the atmosphere through the slit. Therefore, it is possible to prevent local bulging and puncture of the belt-shaped rubber sheet.

However, such a rubber bag has a drawback in that a fluid such as air must be constantly supplied into the non-adhesive zone.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a rubber bag which can effectively prevent puncture without continuously supplying a fluid.

[0008]

As a result of intensive studies, the present inventors have found that the following means can solve the above problems. That is, the present invention includes a strip-shaped rubber layer 6 having a slit-shaped non-adhesive zone 3 for supplying and discharging a fluid, and a reinforcing canvas 5 surrounding the rubber layer 6, and the rubber layer 6
The outer surface 6a of the rubber layer 6 , the auxiliary sheet 8 being adhered at least at a position corresponding to the end 3a of the non-adhesive zone 3.
a is adhered to a through a rubber 10 for adhesion.
As the rubber 10 for use, the tear strength thereof is the above-mentioned auxiliary sheet.
The rubber used is weaker than the adhesive strength between 8 and the adhesive rubber 10.
The rubber bag body is provided. More specifically, the band-shaped rubber 2, a non-bonding zone 3 provided in the band-shaped rubber 2 and for supplying and discharging a fluid, a reinforcement surrounding the non-bonding zone 3 and provided in the band-shaped rubber 2. The auxiliary sheet 8 is bonded to the outer surface 6a of the rubber layer 6 which is provided with the canvas 5 and which is surrounded by the reinforcing canvas 5, at least at a position corresponding to the end 3a of the non-bonding zone 3. Provide a rubber bag.

According to the above-mentioned rubber bag body, since the auxiliary sheet 8 is adhered to the end portion 3a of the non-adhesive zone 3, a fluid is supplied to the non-adhesive zone 3 to inflate the rubber layer 6. The portion on which the stress is most concentrated is supported by the auxiliary sheet 8. Therefore, the rubber layer 6 is formed by the auxiliary sheet 8.
The burden (stress) applied to itself can be reduced, and the occurrence of cracks in the rubber layer 6 can be prevented.

[0010]

Further, according to the above rubber bag body, even if the tearing force applied to the rubber layer 6 reaches the adhesive rubber 10,
Before the adhesive rubber 10 is peeled off from the auxiliary sheet 8,
It breaks itself. Therefore, even if the rubber layer 6 is cracked, the auxiliary sheet 8 remains covered with the adhesive rubber 10 and is not exposed. Therefore, the fluid leaking from the crack is present in the adhesive rubber 10 on the inner surface 8b of the auxiliary sheet 8. It is sealed by and does not reach the auxiliary sheet 8.

Further, the present invention comprises a strip-shaped rubber layer 6 having a slit-shaped non-adhesive zone 3 for supplying and discharging a fluid, and a reinforcing canvas 5 surrounding the rubber layer 6, and the reinforcing canvas 5
The rubber layer 6 surrounded by and the reinforcing canvas 5 are adhered to each other via the adhesive rubber 10, and the tear strength of the adhesive rubber 10 corresponds to at least the end 3a of the non-adhesive zone 3. Provided is a rubber bag body in which a rubber weaker in adhesive strength between the reinforcing canvas 5 and the adhesive rubber 10 is used in the above position. More specifically, the rubber band 2
A non-adhesive zone 3 provided in the belt-shaped rubber 2 for supplying and discharging a fluid, and a reinforcing canvas 5 surrounding the non-adhesive zone 3 and provided in the belt-shaped rubber 2; The rubber layer 6 surrounded by 5 and the reinforcing canvas 5 are adhered to each other via the adhesive rubber 10, and the adhesive rubber 1
0, the tear strength is at least 3 in the non-bonding zone.
Provided is a rubber bag body in which a rubber weaker than the adhesive strength between the reinforcing canvas 5 and the adhesive rubber 10 is used at a position corresponding to the end portion 3a.

According to the above rubber bag body, even if the tearing force applied to the rubber layer 6 reaches the adhesive rubber 10, the adhesive rubber 10 is ruptured before peeling from the reinforcing canvas 5. To do. Therefore, even if the rubber layer 6 is cracked, the reinforcing canvas 5 remains covered with the adhesive rubber 10 and is not exposed. Therefore, the fluid leaking from the crack is sealed by the adhesive rubber 10 and the reinforcing canvas 5 is not exposed. Does not reach

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1-3, 1 is
1 shows a rubber bag according to the present invention. The rubber bag body 1 includes a strip-shaped rubber 2 having a predetermined length and a substantially flat cross section, a slit-shaped non-adhesive zone 3 provided in the widthwise central portion of the strip-shaped rubber 2 over its longitudinal direction, A reinforcing canvas 5 surrounding the adhesive zone 3 is provided, and a rubber layer 6 having a non-adhesive zone 3 in the central portion is formed in a portion surrounded by the reinforcing canvas 5.

The peripheral portion of the non-adhesive zone 3 provided in the band-shaped rubber 2 is closed except for the air supply / exhaust port, and an air supply pipe 7 communicating with the outside connects the band-shaped rubber 2 to the air supply / exhaust port. It is provided through.

Further, the rubber layer 6 surrounded by the reinforcing canvas 5
Of the outer surface 6a of the non-adhesive zone 3 at positions corresponding to both end portions 3a, 3a (positions in the width direction of the end portion 3a of the non-adhesive zone 3 and positions in the vicinity thereof) as shown in FIG. A strip-shaped auxiliary sheet 8 is interposed in the longitudinal direction (along the end 3a of the non-adhesive zone 3) in the longitudinal direction.

As shown in FIG. 3, the surface of the auxiliary sheet 8 is coated with an adhesive rubber 10 (sometimes referred to as "adhesive rubber" in this specification),
The inner surface 8b of the auxiliary sheet 8 is interposed via the adhesive rubber 10.
Is bonded to the outer surface 6a of the rubber layer 6, and the outer surface 8a of the auxiliary sheet 8 is bonded to the inner surface 5b of the reinforcing canvas 5.

The adhesive rubber 10 is made of an adhesive rubber whose tear strength is weaker than the adhesive strength between the adhesive rubber 10 and the auxiliary sheet 8. The tear strength of the rubber 10 is 1
A rubber that is weaker than the adhesive strength between 0 and the rubber layer 6 is used. Such an adhesive rubber 10 is used as the auxiliary sheet 8
And a rubber having a strength lower than that of the rubber layer 6 may be selected from known materials. Specifically, the reinforcing sheet 8 may be nylon, When the rubber layer 6 such as polyester or vinylon is natural rubber, SBR, CR or the like, the adhesive rubber 10 may be a mixed rubber obtained by mixing recycled rubber with natural rubber. When the adhesive rubber 10 is selected, for example, JIS K6256 may be used for tear strength and JIS K6252 may be used as adhesive strength.

Reference numeral 12 denotes a second reinforcing canvas provided in the belt-shaped rubber 2 as necessary, in addition to the reinforcing canvas 5 surrounding the non-bonding zone 3. Known reinforcing cloths such as nylon and aramid are used for the reinforcing canvas 5, the second reinforcing canvas 12 and the auxiliary sheet 8, and the same canvas or different kinds can be appropriately selected and used. .

In the rubber bag body, release paper or the like is interposed between the unvulcanized rubber layers 6 to form the non-adhesive zone 3.
Both ends 3a, 3 of the non-bonding zone 3 of the unvulcanized rubber layer 6
After the auxiliary sheet 8 coated with the unvulcanized adhesive rubber 10 is attached along the surface a, the reinforcing canvas 5 is wound around the auxiliary sheet 8, and the unvulcanized rubber is further wound around this (necessary) According to the above, the second reinforcing canvas 12 is sandwiched between the upper and lower sides, and the unvulcanized rubber is vulcanized by heating and pressurization, whereby the reinforcing canvas 5, 12 and the auxiliary sheet 8 are bonded to each rubber, and the rubber is made of rubber. The bag 1 can be obtained.

The rubber bag 1 according to the present invention is usually used in a state in which a fluid such as air is supplied from the air supply pipe 7 to the non-adhesive zone 3 to inflate the rubber layer 6 into a substantially circular cross section. To do.

At this time, since the bag body 1 having a substantially flat cross section is inflated into a substantially circular cross section, stress concentrates on both ends 3a, 3a of the non-bonding zone 3 of the rubber layer 6. Then, when it is used for a long period of time, as shown in FIG.
Alternatively, the crack 14 is torn at a position in the vicinity thereof and the crack 14 enters. However, in the rubber bag body 1 according to the present invention, the adhesive rubber 10 is interposed between the outer surface 6a of the rubber layer 6 and the inner surface 8b of the auxiliary sheet 8, and the adhesive rubber 10 has a tear strength of the rubber itself. However, since the adhesive strength to the auxiliary sheet 8 is weaker than that of the auxiliary sheet 8, even if the tearing force applied to the rubber layer 6 reaches the adhesive rubber 10, the adhesive rubber 10 is not removed from the auxiliary sheet 8. Before peeling, the rubber 10 will be broken (the broken portion is indicated by B in the figure). Therefore, even if the adhesive rubber 10 remains attached to the inner surface 8b side of the auxiliary sheet 8 (the auxiliary sheet 8 is not exposed), even if the fluid leaks from the crack of the rubber layer 6 to the outside of the rubber layer 6, this leaked fluid The adhesive rubber 10 on the inner surface 8b of the auxiliary sheet 8 does not reach the auxiliary sheet 8 and can prevent the fluid from flowing out.

In each of the above embodiments, the auxiliary sheet 8 is provided at a position corresponding to both ends 3a, 3a of the non-adhesive zone 3, but for example, the entire circumference of the rubber layer 6 is provided. The auxiliary sheet 8 may be provided. The auxiliary sheet 8 is
It suffices if it is provided at least in the portion where stress is concentrated (positions corresponding to both ends 3a of the non-bonding zone 3).

By providing the auxiliary sheet 8,
When the fluid is supplied to the non-adhesion zone 3, it has the effect of reinforcing the rubber layer 6 by restricting the vertical extension applied to the rubber layer 6, but for example, as shown in FIG. 8 is not provided, and at least on the inner surface 5b of the reinforcing canvas 5 and the outer surface 6a of the rubber layer 6 at the position corresponding to the end 3a of the non-bonding zone 3 (the position corresponding to the end 3a of the non-bonding zone 3 or the inner surface of the reinforcing cloth 5). 5b) or the like), or a rubber bag in which the adhesive rubber 10 is interposed may be used. In the bag body 1,
Even if the rubber layer 6 is cracked, the adhesive rubber 10 adheres to the inner surface 5b of the reinforcing canvas 5 at that portion, so that the surface of the canvas is not exposed and therefore the fluid is prevented from leaking to the outside. This is because it is possible to

The auxiliary sheet 8 in each of the above-mentioned embodiments
In the bag body 1 provided with, the auxiliary sheet 8 is
The auxiliary sheet 8 and the auxiliary sheet 8 are bonded to each other via the adhesive rubber 10 having a tear strength lower than that of the auxiliary sheet 8.
However, they may be bonded to each other via another adhesive (for example, an adhesive made of rubber having the same adhesive strength and tear strength or other adhesive). This is because at least the effect of reinforcing the rubber layer 6 can be obtained by bonding the auxiliary sheet 8 to the outer surface of the rubber layer 6 at a position corresponding to the non-bonding zone 3.

[0026]

As described above, in the rubber bag according to the present invention, the auxiliary sheet is bonded to the outer surface of the rubber layer at a position corresponding to the end of the non-bonding zone of the rubber layer. So
The stress applied to the rubber layer can be reduced. Therefore,
It is possible to prevent cracking of the rubber layer, prevent puncture for a long time, and improve durability.

Further, in the rubber bag body according to the present invention, even if the rubber layer is cracked during use, the adhesive rubber covers the surface of the reinforcing canvas or the auxiliary sheet, so that the fluid leaking from the rubber layer does not leak. Do not reach the reinforced canvas or auxiliary seat. Therefore,
A puncture can be prevented for a long period of time without the trouble of continuously supplying a fluid as in the conventional case.

[Brief description of drawings]

FIG. 1 is a plan view showing a rubber bag body according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view with a part of FIG. 2 omitted.

FIG. 4 is a partially omitted cross-sectional view showing a state when the rubber bag body according to the present invention is used.

FIG. 5 is a partially omitted sectional view showing another embodiment according to the present invention.

[Explanation of symbols]

2 ... band-shaped rubber, 3 ... non-adhesive zone, 3a ... end of non-adhesive zone, 5 ... reinforced canvas, 5b ... inner surface of reinforced canvas, 6 ... rubber layer, 6a ... outer surface of rubber layer, 10 ... adhesive rubber

Claims (2)

(57) [Claims] 1. A strip-shaped rubber layer (6) having a slit-shaped non-adhesive zone (3) for supplying and discharging a fluid, and a reinforcing canvas (5) surrounding the rubber layer (6), a outer surface (6a) of the rubber layer (6), at at least the corresponding to the end of the non-adhesive zone (3) (3a) position, the auxiliary sheet (8) is bonded, the auxiliary
The sheet (8) contacts the outer surface (6a) of the rubber layer (6).
It is adhered through the wearing rubber (10) for the adhesion
The tear strength of the rubber (10) is the same as that of the auxiliary sheet (8).
A rubber bag which is weaker in adhesive strength with an adhesive rubber (10) . 2. A strip-shaped rubber layer (6) having a slit-shaped non-adhesive zone (3) through which fluid is supplied and discharged, and a reinforcing canvas (5) surrounding the rubber layer (6), The rubber layer (6) and the reinforcing canvas (5) are adhered to each other via an adhesive rubber (10), and as the adhesive rubber (10), at least the end portion (3a) of the non-adhesive zone (3). ) At a position corresponding to the above), the reinforcing canvas (5)
A rubber bag body, characterized in that a rubber whose tear strength is weaker than that of the adhesive rubber (10) is used.