JP3665038B2 - Rubber bag and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber bag body, and more particularly, a rubber bag body used for a floating body of an anti-pollution film, an oil fence, a so-called rubber weir in a river, and the like used to prevent contamination of the sea, lakes and the like. About. This rubber bag body is formed by forming a rubber sheet reinforced with canvas into a tube shape, sealing it and inflating it by pressurizing with pressurized air or the like to form an elongated rod-like hollow body. Is used by floating in the sea, lakes, etc., and the rubber weir is used to dam the river to a predetermined height and adjust the flow rate.
[0002]
[Prior art]
Conventionally, a rubber bag used as a floating body of a pollution prevention film, a rubber dam or the like has a long and narrow band shape in which a hollow portion 2 described in detail later is formed, as shown in a plan view in FIG. Is inflated by press-fitting air or the like into the hollow portion 2 to form a rod-shaped hollow body. When not in use, exhaust air, etc., and in the case of rubber weirs, crush flat to allow river water to flow in a natural state.
[0003]
As shown in the AA sectional view of FIG. 4 in FIG. 5, an elongated hollow portion 2 (FIG. 5 is shown as an image and is usually closed or inflated in a cylindrical shape) into which a fluid such as air is press-fitted. An inner rubber layer 3 that encloses, an inner reinforcing canvas 4 that wraps and reinforces the inner rubber layer 3, an outer reinforcing canvas 5 that is disposed above and below the inner reinforcing canvas 4, and an outer side in the width direction of the inner reinforcing canvas 4. An arranged end rubber part 6 and a jacket rubber part 7 covering the outside of the outer reinforcing canvas 5 and the end rubber part 6 are provided.
[0004]
The rubber bag 1 is manufactured by superposing an outer rubber layer 7 reinforced by an outer reinforcing canvas 5 having a predetermined size and an unvulcanized inner rubber layer 3 reinforced by an inner reinforcing canvas 4 having a predetermined size. The release sheet 9 having a predetermined size is superimposed on the surface of the inner rubber layer 3 and the portion of the inner rubber layer 3 where the release sheet 9 is not overlapped is overlapped while sandwiching the release sheet 9 therebetween. Thus, an unvulcanized rubber bag 1 is obtained. The unvulcanized rubber bag 1 is vulcanized by a flat plate vulcanizing press (not shown) to obtain a vulcanized rubber bag 1.
[0005]
In this rubber bag 1, by adjusting the width of the release sheet 9, the side portion on the opposite side of the bent portion of the inner rubber layer 3 is not vulcanized and bonded with a narrow width. After vulcanization, the side portion is released and the release sheet 9 is removed, and then the side end portion is closed to form a rubber bag body, which is used as a rubber weir.
[0006]
Further, the width of the release sheet 9 is made smaller than the width of the inner rubber layer 3 which is overlapped, and both end portions of the inner rubber layer 3 where the release sheet 9 is not stacked are vulcanized and bonded, and the bag body is left as it is. As a floating body for anti-pollution film.
[0007]
[Problems to be solved by the invention]
However, in the conventional rubber bag body having the above-described configuration, the release sheet 9 is folded of the inner rubber layer 3 as shown in the partial cross-sectional view of the rubber bag body immediately after vulcanization in FIG. The inner rubber layer end portion 12 is preferably vulcanized with the same thickness as the other portions of the inner rubber layer 3. However, the release sheet 9 is folded on the inner rubber layer 3 and the inner reinforcing canvas 4 in a state of being superimposed on the upper surface of the unvulcanized inner rubber layer 3, and further, the outer reinforcing canvas 5 and the outer rubber layer. In the process of laminating 7 (also referred to as molding operation) or in the vulcanization process, the positional relationship between the release sheet 9 and the inner rubber layer 3 changes (also referred to as misalignment), and the inner rubber layer 3 There is a problem of non-uniform thickness.
[0008]
3 (a) and 3 (b) show an enlarged view of a circle A portion in FIG. 2 and show an example in which the thickness of the inner rubber layer 3 is changed.
For example, as shown in FIG. 3 (a), the release sheet 9 may move, bite into the inner rubber layer end 12 and vulcanize, and the inner rubber layer 3 may become extremely thin partially. . When air is press-fitted into the hollow portion 2 of the rubber bag 1 in this state, the press-fitted air easily leaks to the outside through the inner reinforcing canvas 3.
[0009]
Further, as shown in FIG. 3B, when the release sheet 9 is bent or wrinkled by the molding operation, the thickness of both the upper and lower inner rubber layers 3 is changed and air is injected. Air leakage is likely to occur through the inner reinforcing canvas 4. FIG. 3 (b) also shows that the inner rubber layer end 12 is too thick. When air is pressed into the hollow portion, the inner rubber layer 3 of this portion is extremely stretched and thinned, causing cracks. May occur.
[0010]
The present invention prevents the positional deviation between the release sheet and the unvulcanized inner rubber layer when producing a rubber bag body using the release sheet, particularly when performing a molding operation. An object is to provide a rubber bag having a uniform thickness and a method for producing the same.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problem, the rubber bag according to claim 1 is used for a rubber dam, a floating body of a pollution prevention film, and the like. A rubber bag body manufactured by bonding, sandwiching a release sheet having a release property between the inner rubber layer and the unvulcanized inner rubber layer. causes partially adhesive to vulcanized by viscous Chakuzai the inner rubber layer of unvulcanized, as the adhesive, prior to vulcanization of the rubber bag is the release and the unvulcanized inner rubber layer A pressure-sensitive adhesive that adheres to a sheet and that can be easily peeled off due to a decrease in adhesive strength with at least one of the inner rubber layer or the release sheet after vulcanization is used .
[0012]
The part where the release sheet is sandwiched after vulcanization by sandwiching the inner rubber layer and the release sheet having release properties between the unvulcanized inner rubber layers that are superimposed and vulcanizing Vulcanization adhesion is not performed, and only a portion where no release sheet is sandwiched is vulcanization adhesion. Therefore, after opening one end in the width direction (also referred to as a side portion) of the inner rubber layer and taking out the release sheet, the opened side portion is closed by a closing means to form a rod-shaped hollow body as a rubber weir. Used as such.
[0013]
In addition, in this rubber bag body, the release sheet and the inner rubber layer are formed during the molding operation by previously performing the molding operation and the vulcanization operation by adhering the release sheet to the unvulcanized inner rubber layer with an adhesive. The position of the inner rubber layer of the obtained vulcanized rubber bag body is the front surface because the release sheet does not flow due to the flow of unvulcanized rubber during vulcanization. A uniform thickness. Here, the pressure-sensitive adhesive refers to a material having a function of adhesion, adhesion or physical adhesion.
[0014]
In addition, since this pressure-sensitive adhesive partially adheres the release sheet and the inner rubber layer, the release sheet and the inner rubber layer are easily separated when air is injected, and after vulcanization, the release sheet is separated from the inner rubber layer. When the mold sheet needs to be removed, it can be easily peeled off.
[0015]
If the overlapped inner rubber layer is wider than the release sheet, the inner rubber layer on the side that does not sandwich the release sheet is vulcanized and bonded. When air is pressed into the part (the part sandwiching the release sheet), it becomes a rod-like hollow body easily and can be used as a floating body of a pollution prevention film.
[0016]
The rubber bag according to claim 2 is characterized in that the release sheet is a vulcanized rubber sheet, and the adhesive is an unvulcanized rubber paste.
[0017]
By using a vulcanized rubber sheet as the release sheet, it is easy to stabilize the position of the release sheet during molding because it is familiar with the unvulcanized inner rubber layer. Even if the rubber layer is vulcanized, it does not adhere to the vulcanized inner rubber layer.
[0018]
In addition, by using unvulcanized rubber glue as an adhesive, the release sheet can be adhered to the unvulcanized inner rubber layer during molding, but after vulcanization, the adhesive release sheet and Therefore, the release sheet can be easily peeled from the vulcanized inner rubber layer.
[0019]
Thus, when this rubber bag body is used for a rubber weir or the like, it is easy to remove the release sheet by opening one end of the rubber bag body after vulcanization.
[0020]
In addition, when air is pressed into the hollow portion with both end portions closed, the upper and lower inner rubber layers and the release sheet are easily peeled to form a rod-shaped hollow body, which is used, for example, as a floating body for a pollution prevention film. .
[0021]
The method for producing a rubber bag according to claim 3 is used for a rubber dam, a floating body of a pollution prevention film, and the like, and is produced by overlapping rubber sheets reinforced with canvas and joining the end portions in the width direction. A method for manufacturing a rubber bag, comprising sandwiching an inner rubber layer and a release sheet having releasability between stacked unvulcanized inner rubber layers, and The vulcanized inner rubber layer is partially adhered with an adhesive and vulcanized, and before the rubber bag body is vulcanized with the adhesive , the unvulcanized inner rubber layer and the release sheet are separated. After the adhesion and vulcanization, the adhesive is manufactured using an adhesive that can be easily peeled off due to a decrease in adhesive strength with at least one of the inner rubber layer and the release sheet.
[0022]
By sandwiching the inner rubber layer and a release sheet having a release property between the unvulcanized inner rubber layers that are superimposed, the portion where the release sheet of the inner rubber layer is sandwiched is Only a portion that is not vulcanized and bonded and does not sandwich the release sheet is vulcanized and bonded to form a rubber bag having a predetermined hollow portion depending on the position and size of the release sheet.
[0023]
In addition, by performing the molding operation and the vulcanization operation in a state where the release sheet is adhered to the unvulcanized inner rubber layer with an adhesive in advance, the positional deviation between the release sheet and the inner rubber layer is reduced during the molding operation. In addition, since the release sheet is not caused to flow by the flow of unvulcanized rubber during vulcanization, the entire surface of the inner rubber layer has a uniform thickness.
[0024]
This adhesive is, for example, a rubber paste containing a vulcanizing agent, and can be adhered to the release sheet and the unvulcanized inner rubber layer before the vulcanization operation. It falls and becomes easy to peel from at least one side with an inner side rubber layer or a release sheet. As a result, when the release sheet is removed after vulcanization, the release sheet can be easily peeled off, and the hollow portion can be easily formed even when the air is pressed and expanded.
[0025]
Further, since this pressure-sensitive adhesive partially adheres the release sheet and the inner rubber layer, the vulcanized inner rubber layer and the release sheet can be more easily separated.
[0026]
The method for producing a rubber bag according to claim 4, wherein the release sheet is a vulcanized rubber sheet, and after the rubber bag is vulcanized, one side of the rubber bag is obtained. After the part is opened and the release sheet is taken out, the opened side part is closed to form a bag.
[0027]
By making the release sheet into a vulcanized rubber sheet, it has both the desired flexibility and rigidity, and because it has some familiarity with the unvulcanized inner rubber layer, the molding work is easy and the inside After the rubber layer is vulcanized, it can be easily peeled off. After the rubber bag body is vulcanized, one side portion of the rubber bag body is released, for example, by sandwiching or cutting the release sheet in advance, and the release sheet is taken out. Since the release sheet does not remain in the vulcanized rubber bag body, it is easy to press-in / discharge air or the like, and the weight is reduced as a whole. The opened side portion is closed by a joining means to form a bag.
[0028]
This rubber bag body is preferably used as a rubber dam, etc., and as the joining means, a base dam in which a rubber dam is installed in advance is created, and the open end of the rubber bag body is formed in a plate shape on this base dam It is often closed at the same time as mounting with a body or bolt.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a rubber bag according to the present invention will be described below with reference to the drawings.
As shown in the partial cross-sectional view immediately after vulcanization in FIG. 2, the rubber bag 1 according to the present invention has the release sheet 9 expanded to the inner rubber layer end 12 where the inner rubber layer 3 is bent. The inner rubber layer end portion 12 is vulcanized so that the thickness of the inner rubber layer end portion 12 is the same as the thickness of the inner rubber layer 3 in other portions.
[0030]
Since the release sheet 9 is not bonded to the inner rubber layer 3 that is in contact with both sides of the rubber bag, the inner rubber is pressed when air or the like is pressed between the release sheet 9 and the inner rubber layer 3. The layer 3 is peeled off at the position of the release sheet 9 to form a hollow portion 2 (see FIG. 5), which is inflated to the size of the inner reinforcing canvas 4 and becomes a rubber bag body which is a rod-shaped hollow body. The hollow portion 2 includes an inner reinforcing canvas 4 surrounding the inner rubber layer 3, an outer reinforcing canvas 5 disposed on the outer side of the inner reinforcing canvas 4, and an end disposed on the outer side in the width direction of the inner reinforcing canvas 4. The outer rubber canvas 6 and the outer rubber part 7 that covers the outer side of the end rubber part 6 are protected.
[0031]
In an embodiment of the rubber bag according to the present invention, an adhesive 10 is adhered to at least a predetermined portion of the upper and lower surfaces of the release sheet 9 as shown in FIG. ing. This pressure-sensitive adhesive 10 adheres to the release sheet 9 and the unvulcanized inner rubber layer 3 before vulcanization, and after vulcanized as the rubber bag 1, the vulcanized inner rubber layer 3 or It peels easily from at least one of the release sheets 9.
[0032]
However, it is used as a floating body of an oil fence, an antifouling film, etc., and when the release sheet 9 is made of, for example, polyethylene film, the adhesive 10 and the inner rubber layer 3 are vulcanized and then the adhesive. It may be preferable that 10 adheres to the inner rubber layer 3. In addition, when the rubber sheet as the release sheet 9 is taken out after vulcanization by using it for a rubber weir, the adhesive 10 peels off from the release sheet 9 (rubber sheet) and adheres to the inner rubber layer 3. It is preferable that
[0033]
As the rubber used as the inner rubber layer 3 and the outer rubber layer 7, for example, it is mainly composed of one or more of natural rubber, SBR, NBR, BR, CR, EPDM, etc., and has a predetermined strength and elongation. General rubber compounding agents such as a reinforcing material such as carbon black, a softening agent such as liquid rubber, a vulcanizing agent, a vulcanization accelerator, and an antioxidant are blended. Among these, rubbers mainly composed of EPDM (for example, trade name JSR EP33 manufactured by JSR Corporation) are preferably used in order to improve weather resistance.
[0034]
The canvas used as the inner reinforcing canvas 3 and the outer reinforcing canvas 5 is preferably a woven fabric such as a polyamide fiber or an aramid fiber that is resistant to bending and impact, and for example, a nylon canvas is preferably used.
[0035]
The release sheet 9 may be a flexible thin film having releasability with the inner rubber layer. For example, a film or sheet such as polyethylene or tetrafluoroethylene may be used. In this embodiment, A rubber sheet obtained by vulcanizing NBR (nitrile butadiene rubber) having a thickness of 2.3 mm was used.
[0036]
As the adhesive 10, a non-adhesive paste mainly composed of butyl rubber mixed with a vulcanizing agent is applied to a non-adhesive surface of non-adhesive paper, which is a release-treated paper, to form a tape having a width of about 50 mm. I used one. As the other pressure-sensitive adhesive 10, for example, a commercially available double-sided adhesive tape can also be used.
[0037]
In the rubber bag 1 having such a configuration, the release sheet 9 is adhered to the unvulcanized inner rubber layer 3 by the adhesive 10, so that the release sheet 9 does not move in the molding process described in detail later. Since the sheet does not move even in the vulcanization process, the release sheet 9 has no wavy corrugation and does not bite into the end 12 of the inner rubber layer, and the inner rubber layer has a uniform thickness over the entire surface. Will not occur.
[0038]
Next, an embodiment of the method for manufacturing the rubber bag 1 according to the present invention will be described with reference to FIG. As the release sheet 9, for example, a vulcanized NBR (nitrile butadiene rubber) strip having a width of 1180 mm, a length of 6000 mm, and a thickness of 2.3 mm is prepared. If the release sheet 9 is not taken out after vulcanization, this dimension corresponds to the dimension of the hollow part 2 before pressing the air immediately after vulcanization of the rubber bag to be manufactured (plane, see FIG. 4). . In addition, after removing the release sheet 9 after vulcanization, it is preferable that the size of the release sheet 9 is made larger than that of the hollow part 2. The adhesive portion of the pressure-sensitive adhesive 10 is attached to the upper and lower surfaces (or one surface) of both sides of the release sheet 9 that is the vulcanized NBR strip (the position is not necessarily specified). The pressure-sensitive adhesive 10 is obtained by applying a paste mainly composed of butyl rubber to the non-attached paper (not shown).
[0039]
Separately, a nylon canvas (trade name “NN-300 (G)” manufactured by Ayaha Kogyo Co., Ltd.) is used as the inner reinforcing canvas 3, and EPDM is mainly used on the upper surface of the inner reinforcing canvas 3 (the surface that becomes the inner surface of the bag). Then, an unvulcanized inner rubber layer 3 having a thickness of 2.3 mm mixed with a reinforcing material, a vulcanizing agent and the like is stacked. A release sheet 9 in which the pressure-sensitive adhesive 10 is partially adhered is adhered to the longitudinal center line of the inner rubber layer surface of the laminated body while matching one of the longitudinal sides. When the release sheet 9 is attached to the inner rubber layer 3, the non-adhered paper of the adhesive 10 is peeled off.
[0040]
The procedure for superposing the release sheet 9 on the inner rubber layer 3 to form the unvulcanized rubber bag 1 is to superimpose the unvulcanized outer rubber layer 7 on the outer reinforcing canvas 5, The inner reinforcing canvas 4 and the unvulcanized inner rubber layer 3 are superposed on each other, and a release sheet 9 partially coated with an adhesive 10 is attached to the upper surface of the inner rubber layer 3. Subsequently, the portion of the inner rubber layer 3 where the release sheet 9 is not attached and the inner reinforcing canvas 4 are folded from the end in the width direction while sandwiching the release sheet 9 to form an unvulcanized intermediate laminate. The outer reinforcing canvas 5 and the outer rubber layer 7 are overlapped on the outer periphery of the intermediate laminated body to form an unvulcanized rubber bag 1. The unvulcanized rubber bag 1 is vulcanized by pressurization and heating with, for example, a large flat plate press to obtain a vulcanized rubber bag 1.
[0041]
In the rubber bag 1 that can open one side in the width direction such as a rubber weir, the side part that can be opened is opened, the release sheet 9 is taken out, and the opened side part is joined again. The rubber bag 1 is completed. For example, as shown in FIG. 6, which is a cross-sectional view of a rubber bag body 23 completed as a rubber weir, an open end portion 26 of the rubber bag body 23 is formed on the upper surface of the dam foundation 20. Is closed and fixed with a sheet metal 21 and a bolt 22. Air is press-fitted into the rubber bag body 23 to be inflated to a predetermined height. The running water blocked by the rubber weir overflows the rubber weir in the direction of the arrow 25 and flows down.
[0042]
When used as a pollution control membrane floating body, etc., vulcanize and bond both sides, and attach a base 8 (see FIG. 4) for sucking and discharging air to the end in the length direction to complete the rubber bag. To do.
[0043]
【The invention's effect】
As is clear from the above description, the rubber bag body and the manufacturing method thereof according to the present invention have the following effects . That is,
In the rubber bag according to claim 1, the upper and lower inner rubber layers adhere to each other even when vulcanized by a flat plate vulcanizing press by sandwiching a release sheet between unvulcanized inner rubber layers. In addition, since this release sheet is partially adhered to the inner rubber layer before vulcanization by the adhesive, the release sheet does not move during vulcanization during the molding operation. This is a rubber bag having a uniform thickness. Furthermore, if the rubber dam is vulcanized, by opening the side portions of the rubber bag, it can easily be taken out release sheet.
[0044]
The rubber bag according to claim 2 is a rubber sheet in which the release sheet has been vulcanized, has an appropriate familiarity with the unvulcanized inner rubber layer, and adheres appropriately, and is small after vulcanization. It can be peeled off with force. In addition, by using unvulcanized rubber glue as an adhesive, the rubber glue expresses the necessary adhesive force before vulcanization, and after vulcanization, it peels off from the release sheet and adheres to the inner rubber layer. Thus, a release sheet such as a rubber sheet can be easily taken out.
[0045]
The method for producing a rubber bag according to claim 3 uses a vulcanized rubber sheet as a release sheet, and has a high adhesive strength before vulcanization as an adhesive, and has an adhesive strength with the release sheet after vulcanization. Since the lowering sheet is used, there is no displacement of the release sheet in the molding process and vulcanization process, and after vulcanizing the rubber bag body, the release sheet is easily peeled off from the inner rubber layer and the hollow part is removed. It is also easy to form and take out the release sheet.
[0046]
According to the method for manufacturing a rubber bag according to claim 4, since one side of the vulcanized rubber bag is opened and the release sheet is taken out to form a rod-shaped hollow body, rubber such as a rubber weir After being formed into a bag-making body, it is easy to press-in and discharge air or the like, making it lightweight and easy to handle as a rubber bag body.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a state immediately after vulcanization of a rubber bag according to the present invention.
FIG. 2 is a cross-sectional view showing a state immediately after vulcanization of a rubber bag with one side portion cut according to the present invention.
FIG. 3 is a partial sectional view showing a problem of a rubber bag using a conventional release sheet. FIG. 3A shows an example in which the release sheet 9 bites into the inner rubber layer end 12, and FIG. 3B shows an example in which the release sheet 9 is bent.
FIG. 4 is a plan view of a conventional rubber bag.
5 is a cross-sectional view taken along line AA of the rubber bag shown in FIG.
FIG. 6 is a cross-sectional view of a rubber weir completed using the rubber bag of the present invention.
[Explanation of symbols]
1: Rubber bag 2: Hollow part 3: Inner rubber layer 4: Inner reinforcing canvas 5: Outer reinforcing canvas 6: End rubber part 7: Outer rubber layer 8: Base 9: Release sheet 10: Adhesive 12 : Inner rubber layer end 13: bent

Claims (4)

A rubber bag body used for rubber weirs, anti-pollution membrane floats, etc., which is manufactured by stacking rubber sheets reinforced with canvas and joining the end portions in the width direction,
Between superimposed unvulcanized inner rubber layer, partially by the inner rubber layer and sandwiched release sheet with releasing properties, viscosity Chakuzai the release sheet to the inner rubber layer of the unvulcanized As the adhesive , the rubber bag body is adhered to the unvulcanized inner rubber layer and the release sheet before vulcanization, and after vulcanization, the inner rubber is vulcanized. A rubber bag comprising an adhesive that has a reduced adhesive force with at least one of the layer and the release sheet and can be easily peeled off .   2. The rubber bag according to claim 1, wherein the release sheet is a vulcanized rubber sheet, and the adhesive is an unvulcanized rubber paste. Rubber dam is used like the floating of pollution prevention film, a method for producing a rubber bag that will be produced by joining the widthwise end portion by overlapping rubber sheets reinforced with canvas,
Between superimposed unvulcanized inner rubber layer, sandwiched between the inner rubber layer and the releasability of some release sheet, partly by adhesive to the release sheet to the inner rubber layer of the unvulcanized Adhesive and vulcanize, and as the adhesive, before the rubber bag body is vulcanized, adhere to the unvulcanized inner rubber layer and the release sheet, and after vulcanization, the inner side A method for producing a rubber bag, characterized in that the rubber bag or the release sheet is produced using a pressure-sensitive adhesive that can be easily peeled off due to a decrease in adhesion to at least one of the release sheet.   The release sheet is a vulcanized rubber sheet, and after the rubber bag body is vulcanized, one side of the rubber bag body is opened and the release sheet is taken out. The method for producing a rubber bag according to claim 3, wherein the opened side portion is closed to form a bag.

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