JP4943798B2 - INSPECTION METHOD AND HEAT FUSION DEVICE FOR INSPECTING THE FUSION STATE OF THE FUSION PARTS - Google Patents

Description

  The present invention relates to an inspection method for inspecting a fusion state of a fusion portion of a water shielding sheet, and a heat fusion apparatus.

The waste disposal site has a concave surface provided by digging the ground or constructing a lift wall, and the waste is sequentially buried from the bottom. In this waste disposal site, it is extremely important to prevent the sewage generated from the waste dumped in the concave surface from diffusing into the external soil, and it has a high water shielding performance made of synthetic resin sheets and rubber sheets. By laying the water sheet over the entire concave surface, the outside diffusion of the sewage is prevented.
In actuality, the water shielding sheet is laid by sequentially joining sheet materials having water shielding properties.

  As a method for joining the sheet materials, as shown in FIG. 5, there is a method in which the ends of the adjacent sheet materials 100 are overlapped with each other, and both ends of the overlapped portion are bonded by heat fusion so as to have a hollow portion 110. is there. Moreover, the edge part of the adjacent sheet material 100 is piled up, this overlap part is heat-seal | fused, resin 120 is put on the edge part of the sheet material 100 located above an overlap part, and it joins like FIG. There is.

If there is a defect in the fused part of the sheet material (for example, the fused part is not sufficiently fused), the formed water-impervious sheet will not be able to perform its water-blocking function. After laying the sheet, it is necessary to inspect the fused state of the fused portion.
The inspection method as to whether or not there is a defect in the fusion state of the fusion part of the water-impervious sheet is, for the fusion part fused by the former joining method among the above-mentioned joining methods of the sheet material, A hollow needle is inserted into the cavity portion 110 formed by fusion, and air is sent into the cavity portion 110 through the hollow needle 110 to pressurize the hollow needle 110, thereby determining whether or not the pressure loss is a predetermined value or less. Check for defects. Of the above-mentioned sheet material joining methods, for the fused portion fused by the latter joining method, after spraying soapy water around the fused portion, the portion is covered with a box and sealed. The sealed space is depressurized with test equipment, and whether or not there is a break in the fused portion is inspected depending on whether or not bubbles are generated within a predetermined time.
However, among the above-mentioned sheet material joining methods, the inspection of the fused portion by the former joining method requires inspection for each side of the sheet material, which is very laborious and time consuming, and is a costly burden. Tend to be oversized. Even if it can be found that there is a problem, it is difficult to specify a specific position where the problem exists, and pressurization itself may cause the problem. Further, among the above-described sheet material joining methods, the inspection of the fused portion by the latter joining method requires repeated inspection while shifting the box, and therefore the inspection of the fused portion by the former joining method is one. While it can be performed on the entire side of the sheet material by one inspection, it can be performed only on a part of one side of the sheet material by one inspection.
As described above, the inspection for these fused portions tends to be excessive in terms of labor and cost.

  In order to reduce such a burden, there is an inspection method in which the temperature distribution on the surface of the fused portion is imaged by thermography (for example, a portable thermal infrared image measuring device). In this inspection method, when there is a defect in the fused part, the thermal conductivity is different between the part where the fused part is defective and the other part, so when the temperature of the waterproof sheet changes, Focusing on the mechanism that a temperature difference based on the difference in thermal conductivity occurs on the surface of the sheet, the fused portion is inspected by detecting the temperature difference on the surface of the water shielding sheet. According to such an inspection method using thermography, the temperature difference in the fused portion of the water shielding sheet can be imaged. For example, the person performing the inspection visually observes the image, thereby It is possible to inspect whether there is any defect in the fused state.

However, the above-described inspection using the thermography of the fused portion of the sealing portion of the water shielding sheet is performed again after performing the work of laying the water shielding sheet due to time and labor factors. There are many cases.
For this reason, when inspecting the fusion state of the fusion part using thermography, it is necessary to increase the temperature of the water shielding sheet by applying heat to the water shielding sheet, labor, time, And the cost burden is still substantial.
JP 2005-98959 A

  This invention makes it the subject to propose the technique for reducing the burden of the test | inspection of the fusion state of the melt | fusion part of a water-impervious sheet in view of the above points.

In order to solve this problem, the present application provides the following inspection method.
That is, the present invention disposes by adhering adjacent end portions of a plurality of sheet materials having water-impervious properties from one to the other along the end portions by heat fusion sequentially. The heat seal of the sheet material is formed when forming a water-blocking sheet for preventing leachate generated from the waste material from leaking from the concave surface. Provided is a method for inspecting a fusion state of a fused portion. In this method, the temperature distribution of the surface of the fusion part is sequentially thermographed along the end portion before the temperature of the surface of the fusion part decreases to the temperature of the surface of the other part of the water shielding sheet. And then inspecting the fused state of the fused portion of the water shielding sheet based on the image.
According to such a method, the temperature distribution of the surface of the fusion part is sequentially thermographed along the edge before the temperature of the surface of the fusion part falls to the temperature of the surface of the other part of the water shielding sheet. It is designed to image. That is, when inspecting the fused state, the heat applied when fusing adjacent end portions of a plurality of sheet materials can be used. There is no need to raise the temperature of the fused part of the sheet. Further, in parallel with the fusion work for forming the water shielding sheet, it is possible to collectively perform an inspection work (imaging work) as to whether or not there is a defect in the fusion part. Therefore, labor, time, and cost burden can be reduced.

Imaging by the thermography may be performed before the temperature of the surface of the fused portion is lowered to the temperature of the surface of the other portion of the water shielding sheet.
For example, it can be performed within 1 minute, preferably within 30 seconds, after the ends of the plurality of sheet materials are heat-sealed by the heat-sealing machine. As described above, when imaging by thermography is performed immediately after the ends of the plurality of sheet materials are heat-sealed by the heat-sealing machine, when the adjacent ends of the plurality of sheet materials are fused. It is sufficient to inspect the fused state of the fused portion using the applied heat.
Alternatively, in the imaging by the thermography, when a thermal image imaged using a general thermography is viewed, an operator who performs the inspection visually grasps the temperature difference in the thermal image, and thereby the sheet material is visualized. The temperature difference that can recognize the fused state can be made while the temperature difference is between the surface temperature of the fused portion and the surface temperature of the water shielding sheet other than the fused portion. More specifically, when the difference between the temperature of the surface of the fused portion and the temperature of the surface of the water shielding sheet other than the fused portion is, for example, 2 ° C. or more, the imaging by the thermography may be performed. it can. If the temperature difference between the surface temperature of the fused part and the temperature of the surface other than the fused part of the water shielding sheet is 2 ° C. or more (for example, 5 ° C. or 7 ° C.), it is imaged using general thermography. This is because when the thermal image is viewed, the operator who performs the inspection can visually recognize the fused state of the sheet material from the temperature difference in the thermal image. The temperature difference between the surface temperature of the fused portion and the surface temperature of the water shielding sheet other than the fused portion is not limited to 2 ° C. or more. If there is even a slight temperature difference from the surface temperature other than the attached part, for example, the temperature difference enables the operator performing the inspection to visually recognize the fused state of the sheet material from the thermal image. For example, it may be 2 ° C. or lower, for example, 1 ° C.
For example, by the heat-sealing machine, the adjacent ends of the sheet material are sequentially moved from one side to the other along the end, and the ends of the adjacent sheet materials are adjacent to each other. The sheet is formed by thermally fusing both ends of the overlapped portion in the case of overlapping while leaving a hollow portion therebetween, and the imaging by the thermography corresponds to the fused portion that is both ends of the overlapped portion. This can be performed when the difference between the temperature of the surface of the material and the temperature of the surface of the sheet material corresponding to the hollow portion is 2 ° C. or more.

  In addition, the thermography may be moved behind the heat-sealing machine. If it carries out like this, immediately after the edge parts which adjoin each other of a sheet | seat material are fuse | fused with a heat-sealing machine, the temperature distribution of the surface of this melt | fusion part can be imaged by thermography.

The effects of the inspection method of the present application as described above can be obtained by, for example, the following heat fusion apparatus provided by the present application.
The heat-sealing device provided by the present application is laid on a concave surface where waste is buried, and forms a water shielding sheet for preventing leachate generated from the waste from leaking from the concave surface. Preferably, the heat-sealing machine, wherein the end portions of the plurality of sheet materials having water-impervious properties laid on the concave surface are heat-sealed sequentially from one side to the other along the end portions, and the heat A thermography that images the surface temperature distribution of the fused portion of the sheet material heat-sealed by a fusing machine, and the thermography can image the fused portion, The imaging by the thermography is attached to the heat-sealing machine, and the end of the surface before the temperature of the fusion-bonded portion of the water-shielding sheet is lowered to the temperature of the surface of the other portion of the water-shielding sheet. Is performed sequentially along the section It has become way.
In this heat-sealing apparatus, a thermography is attached to the heat-sealing machine in such a state that the fused portion can be imaged. Therefore, in accordance with the operation of the heat fusion machine, the thermography can be moved behind the heat fusion machine, and the fusion part can be appropriately imaged sequentially.
Further, since the heat fusion machine and the thermography are integrally formed, the relative position of the thermography with respect to the heat fusion machine can be made constant, and it can be expected that the fusion part is completely imaged.

  The thermography may be attached to the heat-sealing machine so that a focal position thereof is constant with respect to a relative position of the heat-sealing machine. In this way, if the thermal fuser is attached to the thermal fusion machine so that the focal position is constant with respect to the relative position of the thermal fusion machine, even if the thermal fusion machine or thermography moves. The fused part can be successively imaged without blurring in a focused state.

  The thermal fusion apparatus may be configured to be moved manually, but further includes a self-running means that runs along the end portion from one of the plurality of sheet materials to the other. Also good. If it has a self-propelled means for self-propelling, the labor burden on the operator can be further reduced.

The thermography may image the fused portion within 1 minute, preferably within 30 seconds, after the ends of the plurality of sheet materials are heat-sealed by the heat-sealing machine. Good.
Specifically, the relative position of the heat fusion machine and the thermography, the running speed of the heat fusion apparatus, so that the fusion part is imaged within 1 minute, preferably within 30 seconds after the heat fusion. Etc. may be determined.
The thermography may image the fusion part while the difference between the temperature of the surface of the fusion part and the temperature of the surface of the water shielding sheet other than the fusion part is 2 ° C. or more. It may be.
For example, the heat-sealing machine is adapted to heat-seal both ends of the overlapping portion when the end portions of the adjacent sheet materials are overlapped, leaving a hollow portion therebetween, and the thermography While the difference between the temperature of the surface of the sheet material corresponding to the fused portion at both ends of the overlapping portion and the temperature of the surface of the sheet material corresponding to the cavity portion is 2 ° C. or more. The wearing part may be imaged.

You may further have a preservation | save means to preserve | save the image data imaged by the said thermography.
If the image data imaged in the storage means is stored, it can be confirmed later whether or not there is a defect in the fused portion. Further, not only the presence / absence of a defect in the fused part, but also a part having a defect can be identified.
In addition, this preservation | save means may be provided in the inside of a heat sealing | fusion apparatus, and may exist in the outer side of a heat sealing | fusion apparatus. Moreover, when provided in the inside of a heat sealing | fusion apparatus, the preservation | save means may be removable from a heat sealing | fusion apparatus.

The thermal fusion apparatus may further include display means for displaying image data imaged by the thermography.
According to the heat fusion apparatus having such a display means, it is possible to grasp the presence or absence of a defect in the fusion part while performing the fusion work (or without using other equipment at the work site).

  According to the method for inspecting the fusion state of the fusion-bonded portion of the water-shielding sheet and the heat fusion apparatus of the present invention, the burden of the inspection of the fusion-state of the fusion-bonded portion of the water-shielding sheet can be reduced. .

  Hereinafter, a preferred embodiment of the method for inspecting the fused state of the fused portion of the water shielding sheet of the present invention will be described.

<First Embodiment>
The method for inspecting the fused state of the fused portion of the water shielding sheet is to sequentially weld the surface of the fused portion of the waterproof sheet before the temperature of the surface of the other portion of the waterproof sheet is lowered. The temperature distribution of the surface of the part is imaged by a thermography device, and the fused state of the fused part of the water shielding sheet is inspected based on the image.

This method is performed using, for example, the heat fusion apparatus of the present invention described below. FIG. 1 is a diagram showing a configuration of the heat fusion apparatus 1.
As shown in FIG. 1, a thermal fusion apparatus 1 of the present invention includes a thermal fusion machine 10 that thermally fuses ends of a plurality of sheet materials having a water shielding property laid on a concave surface, and a thermal fusion machine. And a thermography device 20 for imaging the temperature distribution of the surface of the fused portion of the sheet material heat-sealed by 10.
Briefly, the heat fusion apparatus 1 of this embodiment includes, for example, “Twiny T type” and “Comet type” (trademark) of Leister, “Puff 8365 type” (trademark) of Puff Nippon PEM, and HT Can be constructed by attaching the thermographic apparatus 20 to a commercially available self-propelled heat fusion machine such as “Wolf type” (trademark).

The water-impervious sheet is laid on the concave surface where waste is buried, and prevents leachate generated from the waste buried in the concave surface from leaking from the concave surface, and is constructed by joining multiple sheet materials Is done.
The sheet material has a water shielding performance, and the material may be any material as long as it has a water shielding performance, but may be composed of, for example, high density polyethylene. . The shape is not necessarily limited to this, but is a rectangle. The water-impervious sheet is laid by sequentially bonding the ends of adjacent sheet materials by heat-sealing so that the water-shielding performance can be maintained, and laying so as to cover the entire concave surface. .

The heat-sealing machine 10 is an apparatus for sequentially heat-sealing the sheet materials to form the water shielding sheet, and blows hot air on the overlapping portion of the overlapped sheet materials to heat and melt this portion. The heating unit 11 is sandwiched between the heated and melted overlapping parts, and the upper and lower rollers 12a and 12b, which are a pair of rollers for integrating the two sheet materials, and the heat-sealing device 1 are provided. A plurality of free-running rollers 13 for running, and a thermography device 20 attached to the front end thereof extend in the direction opposite to the self-running direction of the heat-sealing machine 10, and the front ends thereof are a pair of upper and lower rollers 12a and 12a. 12b, and an arm portion 14 positioned behind 12b. In addition, let the self-running direction side (left side in FIG. 1) of the heat-sealing machine 10 be the front, and the opposite side to the self-running direction (right side in FIG. 1) be the back.
The heater unit 11 includes a heater nozzle 11a for blowing hot air onto the overlapping portion of the stacked sheet materials, and a hot air generating mechanism (not shown). The heater nozzle 11a is inserted between the overlapping portions of the sheet material positioned in the rotation direction of the pair of upper roller 12a and lower roller 12b indicated by arrows in FIG. 1 when performing heat fusion with the heat fusion machine 10. It is supported so that it can move.

The pair of upper roller 12a and lower roller 12b are attached to the rear side of the main body of the heat-sealing machine 10 via attachment arms 17a and 17b, respectively.
FIG. 2 is a diagram showing a configuration of the mounting arm 17b for attaching the lower roller 12b to the main body of the heat-sealing machine 10.
As shown in this figure, the shaft portion 120a at the center of rotation of the lower roller 12b is connected to an arm member 170 formed in a substantially U-shape.
The arm member 170 includes a long and thin rectangular member 170a and long and thin rectangular members 170b and 170c attached to both ends of the rectangular member 170a in substantially the same direction. The length of the member 170c is configured to be longer than the width of the overlapping portion of the sheet material, and the length of the member 170b is configured to be much shorter than the member 170c.
The shaft portion 120a of the lower roller 12b is connected to the tip of the member 170b.
One end of the tip of the member 170c of the arm member 170 is attached to the main body of the heat-sealing machine 10, and the other end of a long and thin rectangular member 180 extending in a direction substantially perpendicular to the surface including the arm member 170; It is connected.
When using the heat-sealing machine 10, as shown in FIG. 2, the member 170 c is sandwiched between the overlapping sheet materials 100.
The pair of upper roller 12a and lower roller 12b includes the upper roller 12a and the lower roller 12a so as to press-bond both ends of the overlapping portion of the sheet material so that a hollow portion is formed at the center of the overlapping portion of the adjacent sheet material. The central portion of the side roller 12b is formed in a concave shape so as not to contact each other, and the fused portion shown in FIG. 5 is formed. The pair of the upper roller 12a and the lower roller 12b in the present embodiment will be described as rollers having such a shape. However, the present invention is not limited to this, and the sheet is formed so that the fused portion shown in FIG. 6 is formed. The entire overlapping portion of the materials may be crimped.

The operations of the heater unit 11, the pair of upper roller 12 a and lower roller 12 b, and the self-running roller 13 are controlled by a heat fusion device control mechanism 15.
The self-running roller 13 of the present embodiment is controlled so as to detect the overlapping portion of the sheet material by a sensor (not shown) and move along the overlapping portion.
The self-running speed of the self-running roller 13 is suitable for conditions such as the temperature at which the overlapping portion of the sheet material is heated by the heater nozzle 11a, the rotation speed of the pair of upper roller 12a and lower roller 12b, and the pressure bonding force. It is controlled so that it becomes the speed.
In the present embodiment, the measurement by the thermography device 20 attached to the tip of the arm portion 14 can be performed within about 30 seconds after the overlapping portion of the sheet material is heat-sealed by the heat-sealing machine 10. The relative position of the heat fusion machine 10 and the thermography device 20, the traveling speed of the heat fusion device 1, etc. are determined. That is, in the present embodiment, the measurement by the thermography device 20 is performed so that the overlapping portion of the sheet material can be performed within about 30 seconds after the overlapping portion of the sheet material is heat-sealed by the heat-sealing device 10. The relative position of the thermography apparatus 20 and the traveling speed of the heat fusion apparatus 1 are determined, but the present invention is not limited to this, and the relative position of the heat fusion apparatus 10 and the thermography apparatus 20 and the heat fusion apparatus 1 As for the running speed, etc., the temperature distribution of the surface of the fused part is sequentially imaged by thermography before the temperature of the surface of the fused part falls to the temperature of the surface of the other part of the water shielding sheet (preferably within 1 minute). Can be determined. Further, for example, when there is a difference between the surface temperature of the fused portion and the surface temperature of the water shielding sheet other than the fused portion, for example, when the temperature is 2 ° C. or more, the temperature distribution of the surface of the fused portion is sequentially May be determined to be imageable by thermography. Specifically, when the difference between the temperature of the surface of the sheet material corresponding to the fused portion at both ends of the overlapping portion and the temperature of the surface of the sheet material corresponding to the cavity portion is 2 ° C. or higher, the fusion is sequentially performed. The relative position of the heat fusion machine 10 and the thermography device 20, the traveling speed of the heat fusion device 1, etc. may be determined so that the temperature distribution of the surface of the wearing portion can be imaged by thermography.
If the temperature difference between the surface of the fused part and the temperature of the surface other than the fused part of the water shielding sheet is 2 ° C or higher, such as 5 ° C or 7 ° C, it is imaged using general thermography. This is because when the thermal image is viewed, the operator who performs the inspection can visually recognize the fused state of the sheet material from the temperature difference in the thermal image. The temperature difference between the surface temperature of the fused portion and the surface temperature of the water shielding sheet other than the fused portion is not limited to 2 ° C. or more. If there is even a slight temperature difference from the surface temperature other than the attached part, for example, the temperature difference enables the operator performing the inspection to visually recognize the fused state of the sheet material from the thermal image. For example, it may be 2 ° C. or lower, for example, 1 ° C. That is, when a thermal image that has been imaged using general thermography is viewed, the inspection operator can visually recognize the temperature difference in the thermal image to recognize the fused state of the sheet material. It is only necessary that imaging by thermography can be performed while the temperature difference is between the temperature of the surface of the fused portion and the temperature of the surface of the water shielding sheet other than the fused portion.
Although the arm part 14 of this embodiment is comprised so that expansion and contraction is possible so that it can be made compact at the time of non-use of the heat sealing | fusion apparatus 1, it does not necessarily need to be comprised in this way.

Although the heat-sealing machine 10 of this embodiment is demonstrated as a thing of the above structures, the heat-sealing machine 10 does not necessarily need to be comprised so that it may self-propel, and it can be moved manually. It may be. In this case, the heat fusion apparatus 1 includes, for example, Leister's “Ryister Reac type” (trademark), Munsch's “extrusion welder U5R type” (trademark), and Gandell's “Gandell extrusion welder” (trademark). The thermographic apparatus 20 can be configured by attaching it to a commercially available manual heat fusion machine such as the above.
In addition, the heater unit 11 of the present embodiment is configured to blow hot air on the overlapped portion of the overlapped sheet material to melt the portion, but is not limited thereto, and the overlap of the overlapped sheet material is not limited thereto. The structure may be such that a hot iron is brought into contact with the portion and melted.

The thermography device 20 is a device that detects the temperature distribution of the surface of the fused portion of the water shielding sheet that is the test object, and detects the temperature distribution of the fused portion so that the image can be displayed and recorded. Yes.
Specifically, it has a camera unit 21 that includes a sensor that detects infrared rays emitted from the fused portion, and a signal processing unit (not shown) that processes a signal from the camera unit 21 and outputs the processed signal to a monitor or memory. It is configured as follows. The signal processing unit includes a monitor and a memory (not shown). The monitor displays the temperature distribution in different colors based on the input data, and the memory records and stores the input data.
The thermographic apparatus 20 is attached to the tip of the arm part 14 extending from the heat-sealing machine 10 at a position and angle so that the camera part 21 can catch the fused part without fail and its focal position matches the fused part. It has been. In the present embodiment, the thermographic apparatus 20 is attached so as to move directly above the fused portion.
Although the thermography apparatus 20 of this embodiment is described as the above, it is not restricted to this, What is necessary is just to be comprised so that a temperature distribution can be detected at least.
In the present embodiment, the memory is described as being detachable in the thermography device 20, but the present invention is not limited to this, and the memory may be built in the thermography device 20 so that it cannot be removed. It may be provided outside the device 20.

Next, operation | movement of this heat sealing | fusion apparatus 1 is demonstrated.
First, one end of the overlapped portion of the overlapped sheet material is sandwiched between the pair of upper roller 12a and lower roller 12b of the heat-sealing machine 10. Specifically, as illustrated in FIG. 2, the member 170 c is sandwiched between the stacked sheet materials 100.
Subsequently, the heater nozzle 11 a is inserted between the overlapping portions of the sheet material 100.

  When the heat fusion apparatus 1 is operated in a state where the heater nozzle 11a is inserted between the overlapping portions of the sheet material 100, the self-running roller 13 moves forward along the overlapping portion of the sheet material 100, as shown in FIG. In addition, hot air is sequentially ejected from the heater nozzle 11a of the heat fusion machine 10 toward the overlapping portion of the sheet material 100, and the surface of the overlapping portion is melted. Further, the pair of upper rollers 12a and the lower rollers 12b rotate at the same speed as the rotation speed of the self-running roller 13, and the melted overlapping portions are sequentially fed between the pair of upper rollers 12a and the lower rollers 12b, and are subjected to pressure bonding. Is done. In this way, the overlapping portion is heat-sealed.

Further, when the heat fusion apparatus 1 is operated, measurement by the thermography apparatus 20 is started at the same time. That is, as shown in FIG. 3, the infrared radiation energy radiated from the surface of the fused portion, which is the overlapping portion immediately after heat fusion, is measured in a non-contact manner by the sensor of the camera unit 21 of the thermographic apparatus 20. Is done.
The measured signal is sent to the signal processing unit, and the infrared radiation intensity distribution, that is, the temperature distribution is displayed as an image on the monitor.
In the present embodiment, the image data is stored in a disk that is an example of a memory.

When there is a defect in the fused part, a temperature difference occurs in the surface temperature of the fused part due to the difference in thermal conductivity between the fused part and the other fused part. A person who inspects whether there is a place where the data has a temperature difference is evaluated by a monitor or later by a display such as another personal computer to inspect the fused state of the fused part.
FIG. 4 is a photograph showing an example of an image obtained by the thermographic apparatus 20. As can be seen from this photograph, the temperature at the location where there is a defect in the fused portion is different from the temperature at the location where the fused portion is different. The temperature is lower than the temperature at the wearing part.
Note that even if the pair of rollers of the heat-sealing device presses the entire overlapping portion of the sheet material and the fused portion is fused as shown in FIG. The temperature at the location where there is a defect is lower than the temperature at the location where the other fused portion is present, and it is possible to detect the fused portion where there is a failure.

As described above, according to the heat fusion apparatus 1 of the present embodiment, in parallel with the fusion work for forming the water shielding sheet, the imaging work for inspecting whether there is any defect in the fusion part. Can be done together.
That is, the thermographic apparatus 20 images the fused portion within about 30 seconds after the ends of the plurality of sheet materials are thermally fused by the thermal fusion machine 10. Before the temperature of the surface of the part falls to the temperature of the surface of the other part of the water shielding sheet, the temperature distribution of the surface of the fused part can be imaged by thermography in order to check the fused state. The heat applied when the adjacent ends of the plurality of sheet materials are fused can be used. Therefore, it is not necessary to heat the water shielding sheet again to raise the temperature of the fused portion of the water shielding sheet for the inspection work, and the fusion work and the imaging work can be performed at a time. , Labor, time, and cost can be reduced.

  Further, in the heat fusion apparatus 1, since the heat fusion machine 10 and the thermography apparatus 20 are integrally formed, the relative position of the thermography apparatus 20 with respect to the fusion portion can be made constant. The thermographic apparatus 20 can be moved in accordance with the operation of the fusion machine 10.

  Further, in the heat fusion apparatus 1, the thermography device 20 is attached to the heat fusion machine 10 so that the fusion part can be completely imaged and the focal position is constant (so as to match the fusion part). Therefore, the traveling direction and speed of moving the thermal fusing machine 10 and the thermographic apparatus 20 are not shifted, the fused part is not lost, and the image can be formed without being defocused.

  Moreover, since the heat sealing | fusion apparatus 1 is comprised so that it may self-propel, it can reduce a labor burden more.

Further, since the image data imaged by the thermography device 20 is stored in the memory, it can be confirmed later whether there is a defect in the fused portion. Moreover, not only the presence or absence of the defect of a fusion | fusion part but the location with a defect can be specified.
Further, since the heat fusion apparatus 1 has a monitor for displaying the image data imaged by the thermography apparatus 20, the presence or absence of a defect in the fusion part is being fused (or other equipment is used at the work site). (Without)

Second Embodiment
Note that the inspection method for inspecting the fused state of the fused portion of the water-shielding sheet of the present invention does not have to be performed using the thermal fusion apparatus 1 described above, and the thermal fusion machine and the thermography apparatus are not necessarily used. There is no need to be united.
Specifically, as shown in the following second embodiment, the fused state of the fused portion of the water shielding sheet may be inspected.

The inspection method of the present embodiment can be executed using a self-propelled thermal fusion machine and a thermography device that is not integrated with the thermal fusion machine.
This self-propelled heat-sealing machine is a heat-sealing machine having substantially the same configuration as the heat-sealing machine 10 of the first embodiment, but does not include the arm portion 14. That is, as the heat fusion machine of this embodiment, a commercially available self-propelled heat fusion machine as exemplified in the first embodiment can be used.
The thermography device is a device having the same configuration as the thermography device 20 of the first embodiment. This thermographic apparatus is not attached to the heat fusion machine, and an operator moves the thermographic apparatus.
Specifically, when this self-propelled heat-sealing machine is operated, the overlapping portions of the sheet material are sequentially melted and pressed, and the overlapping portions are heat-sealed. The operator has a thermography device after this heat fusion machine so that the sensor of the camera part of the thermography device can sequentially grasp the fusion part heat-sealed by this heat fusion machine. Moving.
In this way, as in the case of using the heat fusion apparatus 1 of the first embodiment, before the temperature of the surface of the fusion part decreases to the temperature of the surface of the other part of the water shielding sheet, the fusion is sequentially performed. The surface temperature distribution of the bonded part can be imaged by thermography, and when inspecting the fused state, the heat applied when fusing adjacent ends of a plurality of sheet materials should be used. Can do.
The imaging by thermography is preferably performed within 1 minute, preferably within 30 seconds, after the ends of a plurality of sheet materials are heat-sealed with a heat-sealing machine. In this way, if imaging by thermography is performed immediately after the ends of a plurality of sheet materials are heat-sealed by a heat-sealing machine, it is given when fusing adjacent ends of a plurality of sheet materials. It is sufficient to inspect the fused state of the fused portion using the generated heat.
In addition, in this embodiment, although demonstrated as what uses a self-propelled heat-sealing machine, you may use the manual heat-sealing machine which was illustrated in 1st Embodiment.
Further, instead of the operator moving the thermography device, a moving means such as a carriage may be attached to the thermography device and moved by self-propelling or manually.

The figure which shows the structure of the heat sealing | fusion apparatus of this embodiment. Explanatory drawing of the attachment state of the lower roller of the heat sealing | fusion apparatus of this embodiment. The figure which shows the use condition of the heat sealing | fusion apparatus of this embodiment. This is a photograph of a location where there is a defect in the fused part, using a thermography device. The figure which shows the joining state of adjacent sheet | seat materials. The figure which shows the joining state of adjacent sheet | seat materials.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal fusion apparatus 10 Thermal fusion machine 11 Heater part 11a Heater nozzle 12a, 12b Roller 13 Self-propelled roller 14 Arm part 20 Thermography apparatus 21 Camera part 100 Sheet material

Claims (9)

Adjacent ends of a plurality of sheet materials having water-impervious properties are sequentially welded from one side to the other along the end by a heat-sealing machine to form a concave surface where waste is buried. When forming a water shielding sheet for preventing leachate generated from the waste from leaking from the concave surface of the sheet material, A method for inspecting the fused state,
Before the temperature of the surface of the fused part falls to the temperature of the surface of the other part of the waterproof sheet, in addition to the fused part , the fused sheet of the waterproof sheet is sequentially added along the edge. The temperature distribution of the surface of the part other than the part is collectively imaged by thermography that moves while keeping the distance from the heat fusion machine constant behind the heat fusion machine, and based on the image of the water shielding sheet, Inspecting the fused state of the fused part,
An inspection method for inspecting the fused state of the fused portion of the water shielding sheet. Imaging by the thermography is performed within 1 minute after the ends of the plurality of sheet materials are heat-sealed by the heat-sealing machine.
The inspection method according to claim 1. Imaging by the thermography is performed when there is a difference of 2 ° C. or more between the temperature of the surface of the fused portion and the temperature of the surface other than the fused portion of the water shielding sheet.
The inspection method according to claim 1 or 2. By the heat-sealing machine, the adjacent end portions of the sheet material are overlapped with each other, and the end portions of the adjacent sheet materials are overlapped sequentially from one end to the other, along the end portion. And performing both ends of the overlapping portion in the case by heat-sealing while leaving a hollow portion therebetween,
In the imaging by the thermography, the difference between the temperature of the surface of the sheet material corresponding to the fused portion that is both ends of the overlapping portion and the temperature of the surface of the sheet material corresponding to the hollow portion is 2 ° C. or more. Sometimes do,
The inspection method according to claim 3. Water-impervious property laid on the concave surface to form a water-impervious sheet for preventing leachate generated from the waste material from leaking from the concave surface. The end portions of the plurality of sheet materials having a plurality of sheets are thermally fused sequentially from one side to the other along the end portions, and are self-propelled along the end portions from the one to the other of the plurality of sheet materials. A heat fusion machine having self-propelled means;
In addition to the fused portion of the sheet material heat-sealed by the heat-sealing machine, the temperature distribution of the surface of the water shielding sheet other than the fused portion is determined by the thermal fusion at the rear of the heat-sealing machine. imaging together while moving while maintaining the distance between the wearing machine constant, and thermography,
Have
The thermography is attached to the thermal fusion machine so that the fusion part can be imaged,
The imaging by the thermography is sequentially performed along the end before the temperature of the surface of the fusion-bonded portion of the water-impervious sheet is lowered to the temperature of the surface of the other part of the water-impervious sheet. Has become,
Thermal fusion device. The thermography is adapted to image the fused portion within 1 minute after the ends of the plurality of sheet materials are heat-sealed by the heat-sealing machine.
The heat sealing | fusion apparatus of Claim 5 . A storage means for storing image data imaged by the thermography;
The heat sealing | fusion apparatus of Claim 5 or 6 . A display means for displaying the image data imaged by the thermography;
The heat sealing | fusion apparatus in any one of Claim 5 thru | or 7 . The thermography is attached to the heat-sealing machine so that the focal position is constant with respect to the relative position of the heat-sealing machine,
The heat fusion apparatus according to any one of claims 5 to 8 .

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