JP2004074683A - Method for lining rubber and sheet for lining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable lining to be performed without retaining air uniformly by a simple work and to allow a problem due to the residue of foreign matter to hardly occur. <P>SOLUTION: A method for lining a rubber includes an adhering step of adhering the sheet 2 for lining to a surface 1 to be treated to be lined while internal air is externally exhausted by utilizing a channel along a string-like rubber 11 in a state in which the rubber 11 is interposed between the surface 1 to be lined and the sheet 2 of unvulcanized rubber, and a vulcanizing step of vulcanizing the adhered unvulcanized rubber sheet 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rubber lining method in which an unvulcanized rubber sheet is attached to a surface to be treated such as a piping member or a tank to be lined, and then vulcanized to form a lining, and a lining suitably used for the method. For sheet.
[0002]
[Prior art]
Conventionally, when a rubber sheet is stuck on the inner surface of a relatively large object such as a tank to perform lining, it is general that all the sticking operations are performed manually. That is, while the unvulcanized rubber sheet is pressed against the surface to be processed such as a tank with a hand roller or the like, the work of removing air between the tank and the rubber sheet is all performed manually.
[0003]
However, the above-mentioned lining method has a problem in that the time required for manual work is long, and furthermore, a high level of skill of an operator is required. Also, in the method using a hand roller, the appearance is often impaired by unevenness such as a roller pressing mark. Furthermore, even if a person skilled in the art is concerned, air may remain in the interior due to unevenness in the degree of pressure applied by the rollers, and the air may expand during vulcanization, causing the rubber sheet to expand and cause defects.
[0004]
On the other hand, since it is difficult to perform a manual operation using a hand roller or the like for a relatively small pipe member or the like, a lining method using decompression or pressurization has been proposed. For example, in Japanese Patent Application Laid-Open No. 52-120416, when rubber lining is performed on a metal flexible tube, a bag-shaped unvulcanized rubber is placed in the tube and the bag opening is sealed, so that the space inside the tube is unvulcanized. After being in a state of being partitioned by rubber, the both ends of the tube are blind-covered, and the space on both sides partitioned by unvulcanized rubber is depressurized through it. Has been proposed in which only uncured rubber is brought into close contact with the inner wall of the tube by gradually pressing only the rubber.
[0005]
[Problems to be solved by the invention]
However, in the above method, there is a problem that versatility is low, such as the necessity of preparing bag-shaped objects having different shapes for each lining object, and that the operation of forming a closed space becomes complicated. In the above technology, the reason why only the inner space of the bag-shaped unvulcanized rubber is not depressurized is that if only one of the spaces is depressurized, a flow path for exhaust cannot be sufficiently secured, and the flat cover is not formed. Similarly, it has been considered to be difficult to overcome this problem when lining a treated surface.
[0006]
In addition, a method of arranging a fine thread between a pipe and a rubber tube and removing air from the fine thread after attaching the rubber tube is also practiced, but there is a problem that the fine thread as a foreign substance remains. . As the fine yarn, a cotton yarn such as a octopus yarn is often used, and depending on the type of a chemical solution or the like that comes into contact with the lining, an air layer remains inside the fine yarn, and depending on the liquid flowing through the tube, the rubber permeates ( (Permeation of water vapor), corroding the pipe body, and sometimes causing liquid leakage.
[0007]
On the other hand, Japanese Patent Application Laid-Open No. 2002-1816 discloses that the peripheral portion of an unvulcanized rubber sheet is pressure-bonded without provision of a fine thread and the like, and then the sheet is uniformly attached by controlling the suction amount. A rubber lining method has been proposed. However, it may not be possible to reliably secure the air flow path for suction depending on the lining conditions and the like.
[0008]
Accordingly, an object of the present invention is to provide a rubber lining method which can perform lining without leaving air evenly by a simple operation, and which hardly causes a problem due to the remaining foreign matter, and a lining which can be suitably used for the method. To provide a sheet for use.
[0009]
[Means for Solving the Problems]
The above object can be achieved by the present invention as described below.
That is, in the rubber lining method of the present invention, in a state where a string-like rubber is interposed between the surface to be treated to be lined and the unvulcanized rubber sheet, a flow path along the string-like rubber is formed. The method is characterized by comprising a sticking step of sticking the sheet to the surface to be treated while exhausting the internal air to the outside by utilizing, and a vulcanizing step of vulcanizing the sticked unvulcanized rubber sheet. In the present invention, the unvulcanized rubber sheet includes a sheet having an annular (tubular) shape. Further, the string-like rubber may be interposed integrally with the sheet.
[0010]
In the above, prior to the attaching step, the unvulcanized rubber is applied to the surface to be treated to be lined while a cord-like rubber is interposed between the surface to be treated to be lined and the sheet of unvulcanized rubber. Performing a temporary attachment step of pressing at least the vicinity of the periphery of the sheet, and the attaching step includes suction and exhaust from the outside through a communication portion in which a space formed between the sheet and the surface to be processed communicates with the outside. Is preferably performed.
[0011]
Preferably, the cord-like rubber is made of the same material as the sheet, and has a minimum cross-sectional width of 0.5 to 10 mm. Here, the minimum width of the cross section means a length at which the interval between two parallel lines is minimum when circumscribing two parallel lines, and is a length corresponding to the minor axis of the ellipse.
[0012]
On the other hand, the lining sheet of the present invention is made of an unvulcanized rubber sheet and has a ridge having a height of 0.2 to 5 mm.
[0013]
In the above, it is preferable that a plurality of the ridges are formed in parallel on the outer peripheral surface by extrusion molding into a tube shape.
[0014]
[Effects]
According to the lining method of the present invention, the sheet is attached to the surface to be treated while exhausting the internal air to the outside by using the flow path along the string-like rubber, so that simple operations such as roller pressing and vacuum pressing can be performed. The lining can be performed without leaving air uniformly. In addition, since the string-like rubber is used, the problem due to the remaining foreign matter is less likely to occur.
[0015]
Along with performing the temporary attaching step prior to the attaching step, the attaching step is configured to suction and exhaust air from the outside through a communication portion in which a space formed between the sheet and the surface to be processed communicates with the outside. In the case where the lining is performed, the lining is highly versatile, does not require much manual work, and can be performed by simpler work. In other words, various types of linings can be handled simply by using a sheet of an appropriate size and shape, so the versatility is high. The tacking process can be performed by simply pressing a part of the sheet, and the sticking process can be automated. And the lining can be performed by a simple operation (without skill).
[0016]
When the cord-like rubber is made of the same material as the sheet and the minimum width of the cross section is 0.5 to 10 mm, by using the same material, it is possible to eliminate the problem due to the remaining foreign matter, and the minimum width of the cross section is reduced. Since it is 0.5 to 10 mm, an appropriate flow path for exhaust can be formed.
[0017]
On the other hand, according to the lining sheet of the present invention, since it has a ridge having a height of 0.2 to 5 mm, the flow path along the ridge is suitably formed only by placing the sheet on the surface to be treated and covering the sheet. Can be formed. Moreover, since the ridges are formed of the same material as the sheet, the problem due to the remaining foreign matter does not occur.
[0018]
When the lining sheet is extruded into a tubular shape and a plurality of the ridges are formed on the outer peripheral surface in parallel, when lining to a pipe or the like, a separate cord-like rubber is interposed on the inner peripheral surface. Even in difficult places, the string-like rubber is formed on the outer peripheral surface as a ridge, so that lining to a pipe or the like can be performed more easily. In addition, since it can be manufactured only by extruding into a tube shape, it is advantageous in terms of manufacturing cost.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken perspective view (a) showing a state after a temporary attaching step in this embodiment, and a sectional view taken along line AA of FIG. FIG. 2 is an enlarged cross-sectional view of the vicinity of the communication portion in FIG.
[0020]
As shown in FIG. 1, the lining method of the present invention includes a lace-shaped rubber 11 interposed between a surface 1 to be lined and an unvulcanized rubber sheet 2. A step of attaching the sheet 2 to the surface 1 to be processed while exhausting the internal air to the outside by using a flow path along 11.
[0021]
The sticking step may be any of pressure bonding using an external force using a hand roller or the like, or pressure bonding using a pressure difference such as suction and exhaust, but pressure bonding using a pressure difference is preferable. In the present embodiment, after performing the temporary attaching process of the sheet 2, the space 3 formed between the sheet 2 and the processing target surface 1 performs suction and exhaust from the outside via the communication portion 4 communicating with the outside. The example which implements a sticking process is shown.
[0022]
As shown in FIG. 1, the tacking step in the present embodiment is performed by interposing a string-like rubber 11 between the surface 1 to be lined and the sheet 2 of unvulcanized rubber. At least the vicinity of the periphery of the unvulcanized rubber sheet 2 is pressed against the surface 1 to be processed. Thereby, a closed internal space 3 can be formed inside the crimping portion 2a. In FIG. 1, the internal space 3 having a gap substantially equal to the height of the rubber string 11 is formed. However, depending on the thickness and hardness of the sheet 2, the internal space 3 between the rubber strings 11 hardly occurs. May be in a state. In the present embodiment, it is preferable that the volume of the internal space 3 is small from the viewpoint of efficiently performing suction described later.
[0023]
The object of the lining in the present invention can be applied to any object, such as a tank, a container, a pipe, a pipe member, and a plate-shaped body, as long as the surface to be processed is not extremely complicated. Further, the material of the object may be any material as long as it is conventionally rubber-lined, and examples thereof include various metals, ceramics, and resins. . In the present embodiment, an example in which lining is performed on a flat plate surface is described. However, the present invention can be similarly applied to one having a relatively large radius of curvature.
[0024]
The surface 1 to be processed of the object may be previously subjected to a polishing process such as shot blasting, a primer process for improving the adhesive strength, an adhesive process for applying an adhesive, other surface processes, a surface repair process, or the like. . However, in order to suitably carry out the present invention, it is desirable that the surface to be treated of the object is not too sticky.
[0025]
The width of the crimping portion 2a in the temporary attaching step may be 3 mm or more, and preferably 5 to 50 mm, in order to secure the airtightness of the internal space 3. In addition, pressure bonding can be performed with a hand roller or the like. It is also possible to avoid an increase in the volume of the internal space 3 due to the weight of the sheet 2 or the like by partially pressing a portion (for example, a central portion) other than the vicinity of the peripheral edge.
[0026]
As the unvulcanized rubber sheet 2, any of various types of lining rubber sheets can be used in the same manner as in the related art, and examples thereof include natural rubber-based and synthetic rubber-based ones such as chloroprene-based, butyl rubber-based, and ethylene propylene rubber-based. it can. Note that it is preferable to use a sheet 2 that has been subjected to an adhesive treatment in the same manner as the surface 1 to be treated, in order to ensure a high adhesive force. The thickness of the unvulcanized rubber sheet 2 is preferably 3 to 15 mm.
[0027]
The sheet 2 is used after being cut into an appropriate shape and size according to the lining shape and size. Alternatively, the sheet 2 may be cut after performing the temporary attaching step, and the vicinity of the periphery of the sheet 2 may be pressed.
[0028]
The cord-like rubber 11 may be an unvulcanized rubber or a vulcanized rubber. However, in consideration of the adhesiveness with the sheet 2 after vulcanization, the string-like rubber is crushed by decompression and has a flat shape (an ellipse in the case of a circle). Unvulcanized rubber, which becomes a shape), eliminates extreme convexity in the sheet appearance, and improves the appearance. As the rubber material, any of the above-described rubbers for lining can be used, but it is preferable that the rubber is the same material as the sheet 2.
[0029]
The string-like rubber 11 may have any shape such as an elliptical shape, a square shape, a triangular shape, and a semi-circular shape, in addition to a circular shape. However, since it is preferable to be able to be manufactured by extrusion molding, it is preferable that the cross-sectional shape is constant. In the case where the cord-like rubber 11 is manufactured by extrusion molding, it is advantageous in terms of cost to mold a large number of them at the same time.
[0030]
The minimum width of the cross section of the cord-like rubber 11 is preferably 0.5 to 10 mm, more preferably 1 to 3 mm. Although it is easy to use a plurality of cord-like rubbers 11 in terms of work, one or a few cords may be arranged in a zigzag or spiral shape (see FIG. 3B). The length of the cord-like rubber 11 can be appropriately determined according to the area of the lining and the number of linings.
[0031]
Regarding the method of interposing the string-like rubber 11, the sheet 2 may be interposed as a separate body or may be interposed integrally with the sheet 2. When interposed as one piece, the lining sheet of the present invention, that is, the lining sheet made of an unvulcanized rubber sheet and having a ridge having a height of 0.2 to 5 mm can be suitably used. Further, the string-like rubber 11 may be temporarily attached to a predetermined position of the sheet 2. When interposed as a separate body from the sheet 2, the sheet 2 may be covered after placing the string-like rubber 11 on the surface 1 to be processed or temporarily attaching the same.
[0032]
The arrangement shape of the cord-shaped rubber 11 is not limited to the comb shape as shown in FIG. 1, and may be any of the arrangement shapes shown in FIGS. However, it is preferable that all of them are continuous up to the communication portion 4. When the flow paths are continuous, the string-like rubbers 11 may be slightly apart from each other, and specifically, a distance of 600 mm or less is preferable.
[0033]
3 (c) uses a lining sheet in which a plurality of ridges 12 having a height of 0.2 to 5 mm are formed in parallel to the sheet edge, and the ridges 12 intersect with the ridges 12. This is an example in which a cord-like rubber 11 is interposed. Such a sheet for lining can be continuously manufactured by extrusion molding, calendar molding, or the like, which is advantageous in terms of manufacturing cost.
[0034]
When the string-like rubbers 11 (or the ridges 12) are arranged in parallel, the respective intervals are preferably 50 to 600 mm, depending on the minimum cross-sectional width of the string-like rubbers 11 and the thickness of the sheet 2, and the like. 100-300 mm is more preferable.
[0035]
In the sticking step of the present embodiment, the space 3 formed between the sheet 2 and the processing target surface 1 performs suction and exhaust from the outside via a communication portion 4 communicating with the outside. By this step, the volume of the space 3 is gradually reduced, and the sheet 2 and the surface 1 to be processed are brought into substantially uniform contact with each other, and the cord-like rubber 11 is deformed flat (not shown).
[0036]
The formation of the communicating portion 4 may be performed in advance on the sheet 2 used in the temporary attaching step, but is preferably formed after the temporary attaching step, and is preferably formed by inserting the hollow needle 5 through the sheet 2. When the communication part 4 is formed by the hollow needles 5 inserted into the sheet 2 as described above, the hollow needles 5 can be easily inserted into the sheet 2 even after the temporary attaching step, and can be pulled out after the attaching step to remove the vicinity of the communication part 4. There is an advantage that the sealing can be completely performed only by press-fitting the seal.
[0037]
The position where the communicating portion 4 is formed may be any position, but the vicinity of the crimping portion 2a is preferable in terms of workability. Note that a plurality of communication portions 4 may be provided.
[0038]
Next, in a state where the communication portion 4 is formed, suction is performed from outside through the communication portion 4. It is preferable to use a vacuum pump, a decompression pump, or the like for suction. At the time of the suction, it is preferable to reduce the suction amount at least once so as to reduce the pressure so that the internal pressure does not suddenly decrease. In particular, when a soft rubber material is used, it is preferable to reduce the suction amount early so as not to lower the internal pressure too much. In addition, it is also possible to automate such a series of suction amount control by controlling the opening degree of the valve. As described above, after sufficiently reducing the pressure, the suction is stopped, and the hollow needle 5 is moved. The communication part 4 is closed by, for example, pulling out and crimping the part. When the hollow needle 5 is sufficiently thin, the communication part 4 may be able to be closed simply by pulling it out. The final pressure is preferably -100 KPa (gauge pressure) or less.
[0039]
The vulcanization step of the present invention is a step of vulcanizing the unvulcanized rubber sheet that has been pasted, and can be performed in the same manner as in the conventional vulcanization after pasting the sheet. Prior to vulcanization, an inspection step for inspecting the state of the attached sheet may be performed. After the vulcanization step, a finishing step, a final inspection, or the like may be performed.
[0040]
[Other embodiments]
Hereinafter, another embodiment of the present invention will be described.
[0041]
(1) In the above-described embodiment, an example in which a single rubber sheet is used for lining a flat plate surface has been described. However, for a surface to be processed having a larger area, a plurality of rubber sheets are used to form the lining. The lining may be performed as follows. In this case, the temporary attaching step may be performed by pressing the rubber sheet to the end side of the previously attached or pasted rubber sheet. In this case, the end face of the sheet may be inclined so that a step does not occur in the overlapping portion of the sheet.
[0042]
(2) In the above-described embodiment, an example in which lining is performed on a flat plate surface has been described. However, lining may be performed on the inner surface of a tubular body with a string-like rubber interposed as follows. That is, as shown in FIG. 4, a tacking step of pressing at least the vicinity of the peripheral edge of the unvulcanized rubber sheet 2 while interposing the string-like rubber 11 on the processing target surface 1 which is the inner peripheral surface of the tubular body. The bonding step, the vulcanizing step, etc. may be performed in the same manner as described above. In the temporary attachment step, first, a sheet 2 having a predetermined shape is rolled and arranged inside a tubular body, and both ends of the sheet 2 are crimped to form a crimping portion 2a, and an overlapping portion obtained by rolling the sheet 2 is crimped to form a crimping portion. With 2b, at least the periphery of the sheet 2 can be pressed.
[0043]
(3) In the above (2), the sheet 2 may be molded in a tube shape in advance, and the crimped portion 2a may be formed by crimping both ends. In this case also, the vicinity of the periphery of the tubular sheet 2 is in a state of being pressed. In particular, when the size of the pipe is as small as 20A to 300A, as shown in FIG. 5, the lining sheet of the present invention, that is, is extruded into a tube shape, and a plurality of ridges 12 are formed on the outer peripheral surface in parallel. It is preferable to use those that have been used. The height of the ridge 12 is preferably 0.2 to 5 mm, more preferably 1 to 3 mm. The interval between the ridges 12 is particularly preferably 100 to 300 mm.
[0044]
(4) In the above-described embodiment, the example in which the bonding process is performed by suction and exhaust after performing the temporary bonding process of the sheet has been described. However, in the case of performing pressure bonding by external force using a hand roller or the like, the following process is performed. The sheet can be attached.
[0045]
After arranging the sheet and the cord-like rubber on the surface to be processed in the same manner as described above, first, the portion between the cord-like rubber and the cord-like rubber and the portion on the sheet outer peripheral side of the cord-like rubber are connected to any of the cord-like rubbers. Crimping while exhausting to the side. As a result, only the portion along the cord-like rubber is in an uncompressed state, and this is a flow path for exhaust. Next, the channel is crushed in order from the middle or the end of the channel to the outer peripheral side of the sheet. At this time, the above-described suction and exhaust may be used together.
[Brief description of the drawings]
FIG. 1 is an explanatory view for explaining an example of a temporary attaching step in the present invention. FIG. 2 is an enlarged cross-sectional view near a communicating portion in FIG. 1A. FIG. FIG. 4 is a front view sectional view for explaining another embodiment of the present invention. FIG. 5 is a side view sectional view for explaining another embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Unprocessed surface 2 Unvulcanized rubber sheet 3 Space 4 Communication part 11 String rubber 12 Ridge (string rubber)

Claims (5)

With the string-like rubber interposed between the surface to be treated and the unvulcanized rubber sheet, the internal air is exhausted to the outside using the flow path along the string-like rubber. A rubber lining method, comprising: a bonding step of bonding the sheet to a surface to be processed while vulcanizing the bonded unvulcanized rubber sheet. Prior to the adhering step, an unvulcanized rubber sheet is formed on the surface to be treated to be lined while a cord-like rubber is interposed between the surface to be treated to be lined and the sheet of unvulcanized rubber. A step of performing a temporary attachment step of pressing at least the vicinity of the periphery and performing the suction step in which the space formed between the sheet and the surface to be processed is suctioned and exhausted from the outside via a communication portion communicating with the outside. The rubber lining method according to claim 1, wherein The rubber lining method according to claim 1 or 2, wherein the cord-like rubber is made of the same material as the sheet, and has a minimum cross-sectional width of 0.5 to 10 mm. A lining sheet made of an unvulcanized rubber sheet and having a ridge having a height of 0.2 to 5 mm. The lining sheet according to claim 4, wherein the ridge sheet is extruded into a tube shape, and the plurality of ridges are formed on an outer peripheral surface in parallel.

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