JP4028314B2 - Lined lining material and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lining material for lining for the purpose of repair or reinforcement, mainly for underground pipes such as gas pipes, water pipes, sewer pipes, laying pipes such as power lines and communication lines. It is about.
[0002]
[Prior art]
As the lining material of these pipes, in order to prevent the fluid inside from leaking from the damaged part of the pipes, it is necessary to have an airtightness. Moreover, when there is a missing part in the pipeline, the lining material is required to have a considerable strength in order to close the missing part and secure an internal flow path.
[0003]
As a structure of such a lining material, a structure in which an airtight coating layer is formed on a surface which is an inner surface in a lining state in a tubular nonwoven fabric is known. And since it is difficult to manufacture a nonwoven fabric as a cylindrical thing, rolling a sheet-like nonwoven fabric into a cylinder shape, and forming a film layer in it is performed.
[0004]
For example, in Japanese Examined Patent Publication No. 58-33098, as shown in FIG. 2, an airtight coating layer 2 is formed on one side of a sheet-like nonwoven fabric 1, and this is rounded into a cylindrical shape so that the coating layer 2 is on the outside. A lining material 5 is shown in which both side edges are stitched together and an airtight narrow ribbon 4 is adhered to the surface of the stitched portion 3. This lining material 5 is inserted into the pipe line and turned upside down.
[0005]
Further, in JP-A-7-304099, as shown in FIG. 3, a sheet-like nonwoven fabric 1 is rolled into a cylindrical shape, both edges thereof are sewn, and a cylindrical synthetic resin film layer 2 is extruded on the surface thereof. In addition to being integrated, the thickened portion 6 is formed by making the thickness of the film layer 2 in the stitched portion 3 thicker than other portions. This is also lined up through the pipeline while turning over.
[0006]
[Problems to be solved by the invention]
However, in the lining material 5 described in Japanese Patent Publication No. 58-33098, since the airtightness of the stitched portion 3 is held by the ribbon 4 attached to the stitched portion 3, the ribbon 4 is not bonded to the coating layer 2. If the adhesion is insufficient, leakage of the internal fluid may occur. In particular, in the lining state, the ribbon 4 is adhered to the inside of the stitched portion 3, so that the ribbon may be peeled off by the pressure of groundwater or the like that has entered from the damaged portion of the conduit, and the airtightness may be lost.
[0007]
Further, when the lining material 5 is lined on the inner surface of the pipe line, the diameter of the lining material 5 is slightly expanded. At this time, the stitching portion 3 is opened, and the ribbon 4 stuck across the stitching portion 3 is attached to the ribbon 4. Tension works in the width direction. Therefore, there is a possibility that the ribbon 4 is peeled off in combination with the external pressure due to the groundwater or the like.
[0008]
Further, in the lining material 5 described in JP-A-7-304099, the synthetic resin tube having a thick coating layer 2 of the stitching portion 3 is covered as described above. 3 is secured and the groundwater does not enter, but when extruding the tube, the stitched portion 3 of the tubular nonwoven fabric and the thick portion 6 of the coating layer 2 are exactly the same. If the tubular nonwoven fabric is twisted during molding, the stitched portion 3 and the thick portion 6 do not coincide with each other, and the effect of providing the thick portion 6 on the coating layer 2 may be lost.
[0009]
That is, when the surface of the cylindrical nonwoven fabric is covered with a synthetic resin tube, the cylindrical nonwoven fabric stitched in a cylindrical shape is passed through an extruder, and the synthetic resin tube is extruded and adhered to the surface of the cylindrical nonwoven fabric. The coating layer 2 is used.
[0010]
At this time, in order to improve the adhesion of the tube to the tubular nonwoven fabric, the pressure is reduced from the inside of the tubular nonwoven fabric, but the stitched portion 3 in the tubular nonwoven fabric is in a state where the sheeted nonwoven fabric 1 is abutted against other parts. Compared to the above, the air permeability is large, and the needle trace in which the suture thread is sewn in the suture part 3 also has air permeability.
[0011]
Therefore, when the pressure is reduced from the inside of the cylindrical nonwoven fabric, the tube is strongly sucked inward at the butting portion and the needle mark position of the sheet-like nonwoven fabric 1 at the stitched portion 3, and the position is displaced from the thick portion of the tube. If so, there is a possibility that a pinhole is generated in the coating layer 2 because it is strongly attracted locally.
[0012]
When a pinhole is generated in the coating layer 2, not only fluid leaks from the pinhole, but also when the butt portion is opened during the lining as described above, the coating layer 2 is torn by the pinhole and the airtightness is increased. There is a risk of being lost.
[0013]
The present invention has been made in view of such circumstances, and in a lining material composed of a nonwoven fabric stitched in a cylindrical shape and an airtight film layer formed on the surface thereof, the airtightness of the film layer at the stitched portion is improved. It is intended to ensure and form an airtight lining reliably.
[0014]
[Means for Solving the Problems]
Thus, the lining material of the pipe line of the present invention is a lining material in which an airtight coating layer is formed on the outer surface of the cylindrical nonwoven fabric formed by stitching between the side edges of the sheet-shaped nonwoven fabric. A belt-like fabric is bonded to the outside of the stitched portion while maintaining air permeability, and the coating layer is formed on the outside of the belt-like fabric.
[0015]
In this lining material, it is preferable that the stitched portion of the tubular nonwoven fabric and the belt-like fabric are bonded in a dot shape or a line shape. As the means, for example, the stitched portion of the tubular nonwoven fabric and the belt-like fabric can be bonded with a powdery or granular adhesive. The powdery or granular adhesive is preferably made of a thermoplastic resin.
[0016]
In addition, as another means for bonding the cylindrical nonwoven fabric and the strip fabric in a dotted or linear manner, an unevenness is formed on the surface of the strip fabric facing the cylindrical nonwoven fabric, and the convex and concave portions of the strip nonwoven fabric are bonded to the cylindrical nonwoven fabric. You can also
[0017]
In the method for producing a lining material for a pipe line of the present invention, a tubular nonwoven fabric is formed by stitching between side edges of a sheet-like nonwoven fabric, and the belt-like fabric is kept breathable outside the stitched portion of the tubular nonwoven fabric. Adhering to the cylindrical nonwoven fabric, and then covering the cylindrical nonwoven fabric with a plastic tube, depressurizing the inside of the cylindrical nonwoven fabric, and bonding the plastic tube to the cylindrical nonwoven fabric to form a coating layer It is.
[0018]
In the invention of the method for producing the lining material, an adhesive is interposed in the form of dots or lines on the surface of the belt-like fabric facing the tubular nonwoven fabric and / or outside the stitched portion of the tubular nonwoven fabric. It is preferable to bond the belt-like fabric to the stitched portion of the tubular nonwoven fabric while heating the agent while maintaining the air permeability.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of a lining material 7 according to the present invention. Reference numeral 8 denotes a tubular nonwoven fabric obtained by rolling a sheet-like nonwoven fabric 9 into a cylindrical shape and stitching both side edges together with sutures 10.
[0020]
In this tubular nonwoven fabric 8, the sheet-shaped nonwoven fabric 9 may be composed only of the nonwoven fabric, but the nonwoven fabric is integrally joined to the outer surface, the inner surface, or the thickness of the nonwoven fabric, and the tensile strength and elongation are controlled. Can also be used.
[0021]
The sheet-like nonwoven fabric 9 is rolled into a cylindrical shape, both side edges are butted together, and stitched together with a suture thread 10 to form a tubular nonwoven fabric 8. The stitching structure is not particularly limited, and the both side edges of the sheet-like nonwoven fabric 9 may be overlapped and stitched. In any case, both side edges of the sheet-like nonwoven fabric 9 are firmly sewn so that the joint portion does not open excessively when the lining material 7 is expanded during lining.
[0022]
In the drawing, one sheet-shaped nonwoven fabric 9 is shown as being rolled into a cylindrical shape and stitched at both sides on one side. However, if the width of the sheet-shaped nonwoven fabric 9 is not sufficient, two sheets are used. The above-described sheet-like nonwoven fabric 9 may be stitched between the side edges to form a tubular shape, and the tubular nonwoven fabric 8 may have a plurality of stitched portions.
[0023]
Thus, the strip-shaped fabric 11 is bonded to the outside of the stitched portion in the tubular nonwoven fabric 8. A woven fabric or a non-woven fabric tape can be used for the belt-like fabric 11, and the belt-like fabric 11 is bonded to the outside of the stitched portion of the tubular nonwoven fabric 8 so as to maintain the breathability of the belt-like fabric 11.
[0024]
As the means for adhesion, in the example of FIG. 1, a powdery or granular adhesive 12 made of a thermoplastic synthetic resin is sandwiched between the belt-like fabric 11 and the stitched portion of the tubular nonwoven fabric 8, and heated to adhere. By melting the adhesive 12 and adhering it in the form of dots, the air permeability of the belt-like fabric 11 is maintained in the portion between the adhesives 12.
[0025]
A thermosetting adhesive can also be used as the adhesive 12. That is, a thermosetting resin liquid is applied as an adhesive to the stitched portion of the tubular nonwoven fabric 8 in a dotted or linear manner, and the adhesive is cured by overlapping the belt-like fabric 11 to adhere to the dotted or linear shape, The belt-like fabric 11 can be bonded while maintaining the air permeability.
[0026]
As another means, air permeability in the concave portion can be maintained by forming irregularities on the bonding surface of the belt-like fabric 11 and adhering the cylindrical nonwoven fabric 8 in a dotted or linear manner at the convex portions of the concave and convex portions. .
[0027]
The irregularities of the belt-like fabric 11 may be irregularities that inevitably occur due to the rise and fall of the weaving yarn when the belt-like fabric 11 is a woven fabric, and when the belt-like fabric 11 is a nonwoven fabric, its adhesive surface By embossing, irregularities can be formed.
[0028]
An airtight coating layer 13 made of a synthetic resin is formed on the outer surface of the cylindrical nonwoven fabric 8. This coating layer 13 is formed by sticking a tube obtained by extruding a synthetic resin to the outside of the tubular nonwoven fabric 8, and is continuously attached to the outside of the belt-like fabric 11 at the stitched portion. Yes.
[0029]
The belt-like fabric 11 in the present invention is for sucking from the inside of the tubular nonwoven fabric 8 to prevent the coating layer 13 from being excessively sucked from the butted portion and the needle trace of the sheet-like nonwoven fabric 9 and being damaged. Therefore, it is preferable that the thickness is as thin as about 0.1 to 2 mm, and the width is suitably about 2 to 5 times the suture width of the suture thread 10.
[0030]
In order to manufacture the lining material 7 of the present invention, the belt-like fabric 11 is adhered to the outside of the stitched portion of the tubular nonwoven fabric 8 formed by stitching between both side edges of the sheet-like nonwoven fabric 9 while maintaining air permeability. Is passed through the head of the extrusion molding machine, a synthetic resin tube is extruded on the outside of the tubular nonwoven fabric 8 in the head, and the inside of the tubular nonwoven fabric 8 is decompressed, whereby the synthetic resin tube is made of the tubular nonwoven fabric 8. The film layer 13 is formed by closely adhering to the surface and bonding together.
[0031]
As another method for manufacturing the lining material 7, a synthetic resin tube molded in advance is placed on the outside of the tubular nonwoven fabric 8, and heated while reducing pressure from the inside of the tubular nonwoven fabric 8, so that the synthetic resin tube is heated to the tubular nonwoven fabric 8. It can also be adhered to.
[0032]
[Action]
In the present invention, by providing the belt-like fabric 11 outside the stitched portion of the tubular nonwoven fabric 8, the belt-like fabric 11 supports the synthetic resin tube when the pressure is reduced from the inside of the tubular nonwoven fabric 8, and the soft synthetic resin immediately after extrusion is provided. The tube is prevented from being excessively sucked through the butted portion or the needle trace of the sheet-like nonwoven fabric 9.
[0033]
In the present invention, the belt-like fabric 11 is bonded to the tubular nonwoven fabric 8 while maintaining air permeability. Therefore, when the inside of the tubular nonwoven fabric 8 is depressurized, the reduced pressure is also applied to the outside through the belt-like fabric 11. Acting, the synthetic resin tube is in close contact with the surface of the belt-like fabric 11 and is securely bonded.
[0034]
【The invention's effect】
Therefore, according to the present invention, the coating layer 13 is formed on the outside of the tubular nonwoven fabric 8, so that the sheet nonwoven fabric having an airtight layer is formed into a tubular shape, and the ribbon is attached to the butt portion. The airtightness can be surely formed on the inner surface of the pipe line without being peeled off or being damaged by the adhesion failure.
[0035]
Further, since the coating layer 13 has a uniform thickness as a whole, and there is no partial thickness variation, it is necessary to consider the displacement of the cylindrical nonwoven fabric 8 when the synthetic resin tube forming the coating layer 13 is extruded. There is no.
[0036]
And since the strip | belt-shaped fabric 11 is adhere | attached on the outer side of the stitching | suture part in the cylindrical nonwoven fabric 8, a synthetic resin tube is partly excessively attracted | sucked through the butt | matching part and needle mark of the sheet-like nonwoven fabric 9 in the stitching | suture part. There is no risk of pinholes occurring in the coating layer 13 and airtightness being impaired.
[0037]
Further, when the belt-like fabric 11 is adhered to the tubular nonwoven fabric 8 over the entire surface, the adhesive layer inhibits the air permeability of the belt-like fabric 11, and the suction force is applied to the synthetic resin tube at the portion where the belt-like fabric 11 is adhered. Does not act, and there is a possibility that the tubular nonwoven fabric 8 cannot be properly bonded.
[0038]
On the other hand, in the present invention, the belt-like fabric 11 is bonded to the tubular nonwoven fabric 8 while maintaining air permeability, so that a suction force acts on the outer synthetic resin tube through the belt-like fabric 11 to ensure that Glued to.
[0039]
Further, when the lining material is used to line the pipeline, the tubular nonwoven fabric 8 is impregnated with a curable resin liquid such as unsaturated polyester resin. In the present invention, the belt-like fabric 11 has air permeability. Since it is held, the curable resin liquid can penetrate and impregnate the belt-like fabric 11, and the stitched portion of the tubular nonwoven fabric 8 after the lining is integrated with the curable resin to the belt-like fabric 11. Thus, the strength at the stitched portion does not extremely decrease.
[0040]
Therefore, according to the present invention, in the lining material 7 in which the airtight film layer 13 is formed on the outer side of the tubular nonwoven fabric 8, various problems due to the inevitable stitched portion in the tubular nonwoven fabric 8 are solved at once, and the pipe line The lining material 7 can be reliably repaired or reinforced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a lining material of the present invention. FIG. 2 is a perspective view showing a state of manufacturing a conventional lining material. FIG. 3 is a cross-sectional view of a main part of another conventional lining material. Explanation of symbols]
7 Lining material 8 Tubular nonwoven fabric 9 Sheet nonwoven fabric 11 Striped fabric 12 Adhesive 13 Film layer

Claims (7)

In the lining material (7) formed by forming an airtight coating layer (13) on the outer surface of the tubular nonwoven fabric (8) formed by stitching the side edges of the sheet-shaped nonwoven fabric (9), the tubular nonwoven fabric (8 ), The belt-like fabric (11) is bonded to the outer side of the stitching portion while maintaining air permeability, and the coating layer (13) is formed on the outer side of the belt-like fabric (11). Lining material The lining material for a pipeline according to claim 1, wherein the stitched portion of the tubular nonwoven fabric (8) and the strip fabric (11) are bonded in a dotted or linear shape. The lining of a pipe line according to claim 2, wherein the stitched portion of the tubular nonwoven fabric (8) and the belt-like fabric (11) are bonded by a powdery or granular adhesive (12). Material The pipe lining material according to claim 3, wherein the powdery or granular adhesive (12) is made of a thermoplastic resin. An unevenness is formed on a surface of the belt-like fabric (11) facing the cylindrical nonwoven fabric (8), and the convex and concave portions of the unevenness are bonded to the cylindrical nonwoven fabric (8). Line lining material according to 3 or 4 The tubular nonwoven fabric (8) is formed by stitching between the side edges of the sheet nonwoven fabric (9), and the belt-like fabric (11) is adhered to the outside of the stitched portion of the tubular nonwoven fabric (8) while maintaining air permeability. After that, a plastic tube is put on the outside of the cylindrical nonwoven fabric (8), the inside of the cylindrical nonwoven fabric (8) is depressurized, and the plastic tube is adhered to the cylindrical nonwoven fabric (8) to form a coating layer (13 A method of manufacturing a lining material for a pipe line An adhesive (12) is interposed in the form of dots or lines on the surface of the belt-shaped fabric (11) facing the tubular nonwoven fabric (8) and / or on the outside of the stitched portion of the tubular nonwoven fabric (8), The lining of a pipe line according to claim 6, characterized in that the belt-like fabric (11) is bonded to the stitched portion of the tubular nonwoven fabric (8) by heating the adhesive (12) while maintaining air permeability. Material manufacturing method

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