JP2003112365A - Method for producing vinyl chloride resin liner material for pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method which can easily and promptly produce a vinyl chloride resin liner material for a pipe line having a shape-memory function without leaving water in the folding part of the liner material and take up the liner material while arranging it by a winder installed in a narrow place. SOLUTION: In the method for producing the vinyl chloride resin liner material, in a process in which an extruded original pipe of a vinyl chloride resin material molded by an extrusion molding machine, after being primarily cooled, is subjected to folding processing to decrease the diameter of the original pipe by re-heating, the original pipe is made a contracted original pipe B by folding it from the side of the lower surface. By secondarily cooling the pipe B by ejecting room temperature water 15d, the shape of the pipe B is fixed, and the liner material C is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liner material used for repairing or rehabilitating an aged existing pipeline, for example, a sewer pipe or an underground cable pipeline.

[0002]

2. Description of the Related Art Conventionally, when repairing or rehabilitating an aged existing pipeline such as a sewer pipe or an underground cable pipeline with a liner material, a liner material made of a polyolefin such as polyethylene has been mainly used. For example, Japanese Patent No. 2728266, JP-A No. 11-309779, JP-A No. 11-320685, and JP-A No. 11-320686.
issue.

The liner material formed of the above-mentioned conventional polyolefin-based resin material requires a relatively high temperature and pressure when being brought into close contact with the existing pipeline,
The construction equipment is inevitably increased in size and cost, and there is a problem in work safety. Therefore, since the restoration work requires considerably high temperature and high pressure, the steam generator for the restoration must be upsized, and the device for security thereof must be complicated and the cost must be increased.

Therefore, the present inventors have noticed that the deformation recovery rate is extremely high in the region where the vinyl chloride resin material is transferred from the glass region to the rubber region, and the vinyl chloride resin material is used as the material for forming the liner material. Was used in place of the conventional polyolefin resin material.

When a liner material made of a vinyl chloride resin material is deformed by applying force above the glass transition point or softening point of the material, the molecular chains of the synthetic resin are oriented in the direction of the force, and at the same time Entanglement is extended. If this is rapidly cooled, the state is frozen and stress remains. It has been confirmed that if the frozen state is released during reheating to release the residual stress, there is a shape memory phenomenon that the shape before deformation is restored.

As with the conventional method, the extruded raw pipe obtained by molding a vinyl chloride resin material with an extrusion molding machine has a predetermined temperature (preferably a temperature not _higher than the glass transition temperature T _g of the vinyl chloride resin material). ) To a predetermined temperature (preferably T _{g to} T _g +).
A liner material can be obtained by folding at a temperature of 40 ° C.) to form a reduced raw tube having a reduced cross-sectional diameter and deformation, and secondary cooling and fixing of this shape. When the liner material is heated, the liner material can be restored to its original shape before being reduced and deformed.

With respect to the above-mentioned conventional liner material, the folding portion is formed on a portion other than the lower surface side of the liner material in view of the fact that the reduction deformation is easily processed in the manufacturing process and the winding on the winding machine is easy. It was generally formed in position. In addition, as a secondary cooling method, in general, from the viewpoint of cooling temperature, a method of injecting room temperature water as a cooling medium is used. This is because the cooling method using normal temperature water is advantageous in that it is safe to handle and that a cooling device having a simple structure can be economically used.

[0008]

However, if the liner material has the folds formed at positions other than the lower surface side, in the secondary cooling process, room temperature water is directly supplied or indirectly through a foaming tube or the like. At the time of jetting, there is a drawback that the jetted water is scattered to the liner material at the time of secondary cooling, and particularly remains in the state of being accumulated in the folded portion. The residual water in the liner material wets the device in the subsequent winding process and the like, which causes troubles in the production, and such residual water is not preferable in terms of the appearance of the product.

Therefore, the present invention makes it possible to easily and quickly manufacture a vinyl chloride resin liner material for pipes having shape memory performance without causing water to remain in the folded portion,
Another object of the present invention is to provide a manufacturing method capable of winding the liner material in an aligned state by a winding machine installed in a narrow space.

[0010]

In order to achieve the above-mentioned object, a method for producing a vinyl chloride resin liner material for pipelines according to the present invention is an extrusion raw pipe of a vinyl chloride resin material molded by an extruder. After primary cooling, reheat it and fold it so that the cross-sectional diameter becomes smaller.In the process of folding it from the lower surface side of this extruded raw pipe to make it a reduced original pipe, The liner material is characterized in that the shape of the reduced original pipe is fixed by jetting and secondary cooling.

In the above-mentioned manufacturing method of the present invention, the folding step is a method of folding the extruded raw pipe molded by the extrusion molding machine on the lower surface side to obtain a reduced raw pipe. The folding process for the reduced original pipe can be performed in a mode in which one or two or more folded portions are formed on the lower surface side of the extruded original pipe. When one fold is formed on the lower surface side, the cross section of the reduced original pipe is U-shaped. In this case, the opposite wall of the folded portion is also deformed, and as a result, it is possible to obtain a reduced original pipe having a reduced cross-sectional diameter. When folded in such a manner that two or more folds are formed on the lower surface side, the reduced original pipe has various cross-sectional shapes, but it is possible to obtain a reduced original pipe having a reduced cross-sectional diameter. The points are the same.

When normal temperature water is jetted to the reduced raw pipe for secondary cooling, the jet water does not remain in the folded portion of the reduced raw pipe. That is, since the folded portion of the reduced original pipe is formed on the lower surface side, all of the jet water flows down to the lower side of the reduced original pipe including the folded portion due to the action of gravity, and the outer peripheral surface and This is because it does not remain at all in the folded portion.

The jetting direction of the room temperature water may be any of up, down, left and right with respect to the outer peripheral surface of the reduction original tube. This is because, regardless of the direction in which the room temperature water is jetted, all the jetted water is the same in that it flows down from the outer peripheral surface of the reduced original pipe including the folded portion due to the action of gravity.

In the manufacturing method of the present invention, the folded portion of the liner material is inverted so as to shift from the position on the lower surface side to the position on the side surface side, and then the liner material is rotated about the axis of rotation orthogonal to the vertical direction. It can also be configured to include a step of winding on a rotating winding drum.

In the step of reversing the liner material, the liner material obtained continuously is taken up by a take-up machine, for example, a pair of reversing rollers inclined at 45 ° and a pair of horizontal reversing rollers are successively passed. Can be performed by. Further, since the liner material obtained horizontally from the pair of reversing rollers is folded with the folding part positioned on the side surface side, it can be wound as it is on the winding drum rotating around the rotation axis orthogonal to the vertical direction. it can.

As described above, as to the winding drum after winding the liner material of a certain length, the winding drum is integrally conveyed to the site and used as a material for repairing or rehabilitating the existing pipeline. It can be used in such a manner that it is sequentially delivered.

The vinyl chloride resin that can be used in the production method of the present invention has, for example, an average degree of polymerization of 1000 to 14
100 parts by weight of vinyl chloride resin such as vinyl chloride resin of 00 or acrylic graft modified vinyl chloride resin, 1 to 6 parts by weight of tin or lead stabilizer, acrylic rubber, nitrile rubber or ethylene-vinyl acetate copolymer 10 to 20 parts by weight of a thermoplastic elastomer such as one or more of
Other additives (lubricants, processing aids, contents, etc.) in an amount of 1 to 5 parts by weight can be used. The glass transition temperature of this vinyl chloride resin material is 35 ° C to 80 ° C.

In the production method of the present invention, the extruded raw pipe extruded using a vinyl chloride resin material has a predetermined temperature (preferably, a vinyl chloride resin material The shape memory performance is ensured by performing primary cooling so that the glass transition temperature T _g or lower). Then, this raw material tube is extruded at a predetermined temperature (preferably T
After being heated at a temperature of _{g to} T _g + 40 ° C.), the lower surface side is folded and reduced and deformed, and then room temperature water is sprayed to perform secondary cooling to obtain a liner material fixed in the deformed shape. it can. As described above, this liner material is sequentially wound on the winding drum of the winding machine.

The liner material wound on the winding drum is integrally conveyed to the site. When constructing the liner material in the existing pipeline, first, the liner material is unwound from the winding drum and inserted into the target existing pipeline. Then, by heating this liner material, the liner material can be restored to the original shape before reduction and deformation which has been memorized by the primary cooling. The heating method in this case may be a method of heating while heating the heated gas such as steam into the liner material while the tip of the tube is closed. By this heating, the liner material is restored to the original shape of the extruded raw pipe. By this restoration, the liner material is brought into close contact with the inner surface of the existing pipeline, and the work such as repairing the existing pipeline can be performed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. The method for manufacturing a vinyl chloride resin liner material for pipelines according to the embodiment can be executed using the manufacturing apparatus shown in FIG. Reference numeral 11 is an extruder equipped with a hopper 11a at the upper position, and 12 is an extrusion die connected to the material outlet of the extruder 11. The extrusion shape of the material from the extrusion die 12 is a cylindrical shape. 13 is a temperature control unit,
Upstream cooling section 131 and downstream heating section 1
It is divided into 32. Upstream cooling section 131
A sizing tube 131a is provided on the inlet side of the. In the upstream cooling section 131, the cooling water for primary cooling (10 ° C. to 20 ° C.) is directly jetted to the raw material pipe A for extrusion.

In the downstream heating section 132, the temperature of the extruded raw tube is changed from its glass transition temperature T _g to T _{g with} hot water.
It is set so that it can be reheated to a range of + 40 ° C. Reheating in the downstream heating section 132 may be performed by a far infrared ray, near infrared ray, or other heating ray system instead of hot water.

Numeral 14 is a shaping device which is deformed by folding so that the cross-sectional diameter of the reheated raw material pipe A is reduced. As shown in FIGS. 2 and 3, the shaping device 14
The shaping roller 14b is provided in the upper part and both side parts facing the opening 14a, and the folding roller 14 is provided at the center of the lower part.
c is provided. The folding roller 14c can be moved up and down by operating the operating rod 14d.

When the original extrusion pipe A passes through the opening 14a, the upper wall side and both side walls thereof are deformed by the shaping roller 14b along the pipe axis, and the inflection portion Bb is formed at that portion. At the same time, the lower surface side of the original extrusion pipe A is folded inward by the folding roller 14c, and the folded portion Ba is formed along the tube axis. At this time, the folding roller 1
4c functions so as to push the lower surface side of the extruded raw pipe A,
The folded portion Ba is formed. Further, the folding roller 14c
Is moved upward, the folding distance of the folding portion Ba is gradually increased. As a result, the extruded raw pipe A has the folded portion Ba formed on the lower surface side thereof, and finally, the reduced original pipe B reduced and deformed to have a U-shaped cross-section can be obtained.

Reference numeral 15 is a forced cooling device for secondary cooling,
As shown in FIG. 4, a foaming tube 15a is provided on the inlet side, and a pair of flat rollers 15b is provided on the downstream side. A room temperature water injection pipe 15c is provided above the forming tube 15a.

From the room temperature water jet pipe 15c to room temperature water 15
The reduced original tube B is cooled by injecting d onto the surface of the forming tube 15a. As a result, the reduced original pipe B is fixed in that shape, and the liner material C is obtained. At this time, the sprayed room temperature water 15d is dispersed on the surface of the forming tube 15a and reaches the reduced original tube B, but since the folded portion Ba is formed on the lower surface side of the reduced original tube B, it is injected. All of the room temperature water 15d flows down, and no water remains on the outer peripheral surface of the reduced original pipe B including the folded portion Ba. Therefore, the presence of residual water in the liner material C does not hinder the subsequent steps from being performed and does not deteriorate the appearance of the product of the liner material C.

Reference numeral 16 shown in FIG. 1 is a take-up machine provided on the downstream side of the forced cooling device 15. By the take-off machine 16,
The liner material C is drawn from the upstream side to the downstream side. 1
7 is a reversing device provided on the downstream side of the take-up machine 16. As shown in FIG. 5, the reversing device 17 is provided with a pair of reversing rollers 17a inclined toward the reversing side on the inlet side and a pair of horizontal reversing rollers 17b on the outlet side. The liner material C is gradually inverted in the process of passing between the reversing roller 17a and the reversing roller 17b, and finally about 90 °. The reversal liner material Ca is pulled out to the outlet side of the reversing device 17 by the take-up machine 16.

Reference numeral 18 is a winding machine having a winding drum 18a, and the winding drum 18a is adapted to rotate around a rotary shaft 18b which is orthogonal to the vertical direction. Therefore, as shown in FIG. 6, the reversal liner material Ca pulled out from the reversing device 17 is wound around the winding drum 18a. In this way, the reversal liner material Ca is used for the winding drum 1
Since the reversal liner material Ca is wound around the winding drum 18a, the reversal liner material Ca can be wound up quickly and in an aligned state. Further, since the winding drum 18a is configured to rotate about the rotation axis orthogonal to the vertical direction, the winding machine 18 can be installed in a narrow space.

Using the above-mentioned manufacturing apparatus, the liner material C can be manufactured by the manufacturing method according to the present invention as follows. Extruded vinyl chloride resin material having a glass transition temperature T _g of 50 ° C. to 70 ° C. (4 parts by weight of vinyl chloride resin having an average degree of polymerization of 1000, 10 parts by weight of nitrile rubber, lubricants, processing aids and pigments in appropriate amounts). Hopper 1 of molding machine 11
Put in from 1a, pipe shape (outer diameter: 114 mm, wall thickness:
4.5 mm) of the extruded raw pipe A is molded.

The extruded raw pipe A is a sizing tube 131a.
Pass inside. As a result, the outer diameter of the extruded raw pipe A is already
Set the external dimensions so that they are almost equal to the inner diameter of the pipeline.
regulate. At this time, the upstream cooling section 131
The surface temperature of the source tube A is a glass roll of vinyl chloride resin.
Transfer temperature T_gCool to a lower temperature. in this case,
To quickly restore the original shape of the extruded raw pipe A
Therefore, from the surface of the extruded raw pipe A to the thickness direction,
Glass transition temperature T of vinyl chloride resin in the tube wall _gThan
Be set to cool to a low temperature
preferable.

Then, it is reheated in the downstream heating section 132 so that the temperature of almost the entire extruded raw tube A is T _{g to} T _g +.
It should be in the range of 40 ° C. At this time, if the temperature of almost the entire extruded raw tube A naturally falls within the range of T _{g to} T _g + 40 ° C. by waiting for the heat return from the thick portion of the extruded raw tube A after cooling, The above-mentioned reheating step can be omitted. As a result, the manufacturing equipment for reheating and the energy thereof can be saved, and the manufacturing apparatus can be operated economically. In the temperature range, the original extruded pipe A is reduced and deformed by the shaping device 14 so that the cross-sectional diameter becomes small, and the reduced original pipe B is obtained.

In the reduced original tube B, the stress caused by the orientation of the molecular chains of the vinyl chloride resin is large. The shape in which this stress state remains is the shape of the reduced original tube B by sprinkling normal temperature water from the cooling water pipe 15c to forcibly perform secondary cooling while passing through the forming tube 15a and the flat roller 15b. Is fixed. After that, the liner material C is taken up by the take-up machine 16 and is further taken up by the take-up machine 18 while being inverted by 90 ° by the reversing device 17.

In the process of secondary cooling of the reduced original pipe B, since no jet water remains on the outer surface of the liner material C, the liner material C obtained after the secondary cooling is taken by the take-up machine 16. , Take-up drum 18a via reversing device 17
Can be rolled up. In the winding process on the winding drum 18a, the winding can be performed in an aligned state and quickly. Furthermore, since normal temperature water is used as the cooling medium for the secondary cooling, it is possible to operate economically by using the manufacturing facility which is safe and has a simple structure and is inexpensive.

A liner obtained by such a manufacturing process
-Material C is used for repairing or renewing the existing pipes that have deteriorated.
Used. That is, the liner material C pinched at the tip is used as a pair.
Insert it into the existing pipeline that will be the elephant. At this time, the liner material C
Has been reduced and deformed so that its cross-sectional diameter becomes smaller
The insertion work is extremely easy. Then insert
Heated gas such as steam is pressed into the inside of the liner material C
And liner material C to T _g~ T_gBelow the temperature of + 40 ℃
When heated up, the vinyl chloride forming the liner material C
The freezing of the molecular chain of resin
The space is released. As a result, the liner material is remembered
It is restored to its original shape and adheres to the inner surface of the existing pipeline.
It becomes a state. This will repair or rehabilitate the inner surface of the existing pipeline.
You can

[0034]

Since the present invention is constructed as described above, the following effects are exhibited. According to the manufacturing method of the present invention, when the secondary cooling for the reduced original pipe is performed by injecting room temperature water, the outer peripheral surface of the obtained liner material, in particular, since the injection water does not remain on the folded portion, Subsequent steps can be executed without any trouble. This makes it possible to rapidly perform the subsequent steps without wetting the apparatus used in the respective steps after the secondary cooling and to keep the appearance of the liner material product good in a dry state.

Further, by using normal temperature water in the secondary cooling step, it is possible to carry out the operation safely, and it is possible to use the cooling equipment having a simple structure, so that it can be economically operated.

Further, if the obtained liner material is wound through the reversing step, the winding machine can be installed so that the winding drum rotates around the rotation axis orthogonal to the vertical direction. The winding machine can be installed even in a narrow space, and the liner material can be quickly wound in a state of being aligned with the winding drum.

[Brief description of drawings]

FIG. 1 is a block diagram of a manufacturing apparatus for carrying out a method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

FIG. 2 is a front view of a shaping apparatus in a manufacturing apparatus for carrying out the method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

FIG. 3 is a vertical cross-sectional side view of a shaping apparatus in a manufacturing apparatus that carries out the method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

FIG. 4 is a partial perspective view of a forced cooling device in a manufacturing apparatus for carrying out the method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

FIG. 5 is a perspective view of a reversing device in a manufacturing apparatus for carrying out the method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

FIG. 6 is a perspective view of a winding machine in a manufacturing apparatus for carrying out the method for manufacturing a vinyl chloride resin liner material for pipelines according to the present invention.

[Explanation of symbols]

A Extruded original pipe B Reduction original pipe C liner material Ca reverse liner material 11 extruder 12 Extrusion die 13 Temperature controller 131 Upstream cooling section 132 Downstream heating section 14 Shaper 14c Folding roller 15 Forced cooling device 15d room temperature water 16 drawer 17 Reversing device 17a, 17b Reverse roller 18 Winder 18a winding drum

Claims (2)

[Claims] 1. An extruded raw pipe in the process of primary cooling of an extruded raw pipe of a vinyl chloride resin material formed by an extruding machine, and then reheating the extruded raw pipe to reduce its cross-sectional diameter. A pipe that is characterized in that it is made into a reduced original pipe by folding it from the lower surface side, and the original pipe is fixed by cooling the original pipe with secondary water to obtain a liner material. A method for producing a vinyl chloride resin liner material for roads. 2. The liner material is turned upside down from its lower surface position to its side surface position, and then the liner material is wound around a winding drum of a winder rotating around a rotation axis orthogonal to the vertical direction. The method for producing a vinyl chloride resin liner material for a pipeline according to claim 1.