KR101359074B1 - A Method of Eliminating a Coating, A Use and Devices Implementing the Method - Google Patents

Abstract

The present invention relates to a method for removing from a support constructed on the surface of at least one fabric based on glass fibers a coating adhered to the support, in particular composed of an epoxy or polyurethane type resin. According to the invention, the coating is heated to a temperature higher than its glass transition temperature (Tg) and lower than its viscous flow temperature (Te) when applying at least one heating parameter to heat the coating, the parameter being Each is selected from the coating heating temperature and the coating heating time, which is lower than the physical degradation temperature of the support and shorter than the physical degradation time of the support.

Tank, panel, fiberglass, peeler, coating

Description

A Method of Eliminating a Coating, A Use and Devices Implementing the Method

1 is a schematic cross-sectional view of a panel for a tank insulated wall.

2 is a schematic cross-sectional view of the two panels of FIG. 1 connected to each other adjacent to one another.

3 is a schematic vertical cross-sectional view of the box used in the apparatus for removing the coating of the panel shown in FIG.

<Explanation of symbols for the main parts of the drawings>

5: passage

7: strip

8: coating

20: secondary membrane

23: margin

100: panel

The present invention relates to a method of removing a coating adhered to a support constructed on a surface by at least one fabric based on glass fibers, and also to the use of the method and an apparatus for carrying out the method.

By way of example, more particularly related coatings are adhesive resins, in particular thermosetting resins such as, for example, epoxy type resins or polyurethane type resins.

Such a coating is used to adhere another layer of material onto the surface of the support, for example for the purpose of connecting the plurality of supports together and providing a seal therebetween.

In an exemplary use, as described by the document of French patent FR-A-2 868 060, a tank integrated in the hull of a vessel such as a methane tanker, for example, to transport and store liquefied gas at low temperatures. Such types of supports and coatings are used to form leak-tight insulating walls for and to more specifically to carry out secondary sealing for such tanks.

In this exemplary application, the wall is constituted by panels which abut against each other in the length and / or width direction and are connected to each other by a strip of flexible sheet, wherein the strip is constituted by two edge margins of adjacent panels. In place by adhesive coating on two adjacent supports. In its thickness direction, each panel has a secondary thermal insulation element to form a secondary thermal insulation element, a primary thermal insulation element of shorter length and / or width than the secondary thermal insulation element, and a support for making a connection at the edge clearance. It has a secondary membrane located between the elements, exposed next to the primary insulating element in accordance with the dimensions of.

The support to which the present invention is applied is a support constructed on the surface by at least one fabric based on glass fibers, and more particularly in the above-described exemplary application, for example at least of aluminum adhesively inserted between two glass fiber fabrics. A support made up of one fine metal foil, for example a binder based on polyamide or polyester, can provide adhesion between the glass fiber fabric and aluminum.

Typically, when a layer of material is fixed onto the surface of the support using an adhesive coating, the seal is not perfect at the junction between the layer and the support, or a layer of material is poorly installed on the support, or a particular bond It may occur that the requirements, for example mechanical strength at cooling or traction strength at cooling, are not satisfied.

It is then necessary to remove the layer stuck onto the support and to restart the fixing operation of the layer.

In such a situation, for reasons of preventing excessive cost, it is desirable that the support is restored to its equivalent state to its original state, exhibiting the same adhesive characteristics as when the support was first used, and it is not necessary to change the support.

Unfortunately, after the layer of adhesively bonded material is removed, there is usually a pure coating still adhered to the support.

This residue of the coating adhered to the support is no longer bonded for fixing on a new layer of material and must therefore be removed.

Several methods and mechanisms for removing such coatings are now known, but this is not suitable for the support to which the present invention is concerned.

One such known method commonly used is chemical exfoliation. Release materials designed to be applied on the coating to be removed are available so that the coating itself can be chemically attacked so that the coating can subsequently be removed gradually, for example by scraping with a putty knife. Such chemical methods usually provide good results, but it is often necessary to repeat the operation of applying the release agent and scraping the coating to be removed. In addition, the application of such release agents can be hazardous and can be dangerous for the user as they can release toxic vapors as a result of reaction with the coating. Another drawback is that such chemical stripping agents may contaminate the cleaned surface, thereby making the surface unsuitable for reuse without any need for significant decontamination on the support itself.

Another known delamination method is thermal delamination in which a heating mechanism is used, either by sending pulsed hot air at a temperature that typically lies within the range of about 200 ° C. to 550 ° C., or by an open flame, usually at a temperature of about 750 ° C. Peeling using such a method is based on mitigating the coating on its support by acting indiscriminately against the various deformations that are received when the coating is elevated to high temperatures, such as foaming, crack formation, or combustion. The foamed, cracked or carbonized coating is then peeled off. Such various modifications of the coating are generally caused because the burner temperature of the adhesive type coating or the epoxy type resin or the polyurethane type resin is well below the temperature reached by such a heating stripper, so that the heater has at least its combustion. Occurs when raised to a temperature equivalent to the temperature. Nevertheless, such types of methods have limitations. In order to easily burn off the coating, its support is burned off at the same time or at least physically degraded at its surface, thereby degrading its adhesive characteristics for future use, which is a temperature that the support can withstand without physically degrading This is because it is usually lower than the combustion temperature of the coating. Therefore, it is difficult to restore the support with good quality enough to allow it to be used directly.

In addition, exposed flame strippers cause problems of safety, especially when used in buildings containing combustible materials, as frequently occurs in the workplace.

The present invention attempts to provide a method and related apparatus for removing a coating adhered to a support constructed on a surface by at least a glass fiber based fabric, wherein the method and the apparatus are for example a new layer of coating wherein the glass fiber of the support is supported. The support is not physically degraded in order to make the pure, uncontaminated support available immediately for later processing, such as sticking on a new layer of material, providing adhesion between the surface and the new layer of material. And alleviate the drawbacks inherent in the prior art without degrading the adhesion characteristics of the support.

In a first aspect, the present invention provides a method of removing a coating from a support constructed on the surface of at least one fabric based on glass fibers, in particular composed of an epoxy or polyurethane type resin adhered to the support, wherein the coating is coated When applying at least one heating parameter to heat it, it is heated to a temperature higher than its glass transition temperature (Tg) and lower than its viscous flow temperature (Te), each of which is greater than the physical degradation temperature of the support. It is selected from a lower coating heating temperature and a coating heating time shorter than the physical deterioration time of the support.

Thus, the heating parameter for the heating of the coating is either the temperature at which the coating is heated lower than the temperature at which the support undergoes physical degradation, or the time at which the coating is heated shorter than the time required for the support to physically degrade, or both parameters at the same time. to be.

Glass transition temperature (Tg) means the temperature at which the glass transition occurs, ie, from the solid state to the rubber state measured by differential enthalpy analysis (DEA), known as differential scanning calorimetry (DSC). The viscous flow temperature Te is the temperature at which the resin or adhesive becomes a fluid. By way of example, the physical deterioration temperature Td of the support should be understood in terms of the length of time elapsed at that temperature Td, which may be for example 30 minutes.

According to an advantageous feature of the invention, the coating is maintained at a temperature in the range of 90 ° C. to 110 ° C. for a minimum period of 3 minutes and a maximum period of 15 minutes. In this way, the coating can reach the rubber state without suffering high temperatures for too long, even if the maximum temperature reached by the support is lower than the physical deterioration temperature of the support. This provides additional safety regarding the quality of the support upon reuse or regeneration after the high temperature removal method is performed.

According to an advantageous feature of the invention, the coating is immediately removed in a mechanical manner by scraping after the heating step. Preferably, mechanical scraping is performed manually using a tool which may be a putty knife or any other equivalent means known to those skilled in the art. When converting a solid coating to a rubbery coating, it is necessary to quickly start the scraping operation before the coating returns to the solid state. Thus, in rubbery coating, manual scraping is possible using a putty knife or other equivalent tool, and the heated coating is gradually removed.

In a second aspect, the present invention provides the use of a removal method for a coating adhered to a secondary sealing membrane of a wall panel of a tank for containing liquefied gas,

The panel comprises a secondary thermal insulation element, a primary thermal insulation element, and a secondary membrane positioned between these two elements in the thickness direction thereof,

The primary insulation element has at least one dimension other than its own thickness that is smaller than the secondary insulation element,

A portion of the secondary membrane extending beyond the primary insulation element in the direction of the dimension forms the support.

According to one feature, the support comprises a metal foil of aluminum in particular bonded between two glass fiber fabrics, one of which forms the surface of the support, in particular by a binder based on polyamide or polyester.

The present invention also attempts to provide an apparatus associated with the method described above, wherein the apparatus is for removing a coating of adhesive tape or resin of an epoxy or polyurethane from a support constructed on a surface by at least one fabric based on glass fibers. will be.

In a first embodiment of the invention, an apparatus for removing a coating adhered to a support by carrying out a removal method comprises a thermal stripper having at least one end comprising an outlet nozzle for delivering hot fluid (air). A heat extruder, which is also laterally attached to the side of the end of the heat exfoliator so as to maintain an end for delivering the hot fluid (air) over a predetermined minimum distance from the surface of the coating. At least one abutment supported against the surface of the coating.

In this way, it is possible to quickly reach the temperature required to remove the coating without degrading the support. Since this is done manually, a laser thermometer or equivalent allows the temperature of the support to be checked to provide further safety monitoring. The procedure is then local heating followed by immediate scraping of small consecutive zones.

For example, the temperature at which the fluid of the heat stripper is heated may be higher than the physical deterioration temperature of the support, and possibly about 350 ° C. for a minimum distance of 50 mm from the surface of the coating.

In a second embodiment of the invention, an apparatus for removing a coating adhered to a support by carrying out a removal method comprises or is constituted by a flat tool for heating the coating by making indirect contact therewith. do.

Such a tool, applied indirectly to the coating for removal, is raised to a heating temperature of, for example, about 110 ° C.

Application is said to be indirect because the microprotective medium is inserted between the surface of the coating and the heater tool to prevent the coating from adhering to the heater tool when the glass transition temperature is reached, the micromedium has no thermal insulation function. For this purpose, the device may have a protective film for insertion between the flat heater tool and the coating. By way of example, the protective film may be polyane type.

This implementation of the method of the present invention makes it possible to treat a larger area of area than before, and when the tool is heated to 110 ° C., the coating does not risk deteriorating the support at about 90 ° C. to 110 ° C. Reaches the temperature. The coating is then removed by mechanical scraping immediately after the flat heater tool and the microprotective medium are removed, and upon recovery, the medium can advantageously remove a portion of the coating to be removed attached thereto.

In a refinement, the second device of the invention further comprises means for pressing the heater tool towards the coating. For example, this pressure may be about 0.1 bar. Thus, a constant pressure is ensured over the zone to be heated, whereby the hot contact treatment is distributed in an equal way over the entire heating zone.

In a third embodiment of the present invention, the apparatus for removing the coating adhered to the support by carrying out the method of the present invention comprises or by means of a thermal stripper located in a bottomless box having a cold air inlet and a hot air outlet. Characterized in that the end of the extruder for delivering the hot fluid is directed to at least a portion of the bottomless area of the box.

In this third embodiment of the present invention, the coating similarly rapidly reaches temperature, moves the bottomless box onto the next zone to be heated, and immediately scrapes the coating when the next zone is heated. It is enough to ping. The air holes provided in the box allow the air inside to be replaced, thus preventing the risk of overheating the inside of the box, which results in raising the support to be regenerated to too high a temperature.

Reading the following description helps to understand the present invention. This description, given fully illustratively and with reference to the drawings, relates to the use of creating a thermally insulating and leakproof wall of a tank for transporting and storing liquefied gas at low temperatures. The tank is integrated into the hull of a ship, such as a methane tanker, and more specifically relates to achieving a secondary seal for such a tank.

This thermal insulation panel consists of two consecutive sealing membranes, the primary membrane in contact with the material contained in the tank and the secondary membrane disposed between the primary membrane and the carrier structure, the two membranes alternate with two thermal barriers. .

In Figures 1 and 2, these leak-proof and insulating walls are generally planar and between the two outer and inner rigid plates 101 and 102 in the thickness direction extending transversely to the plane (2). ), A secondary film 20, and a set of prefabricated panels 100 that successively include a primary insulator 1. The primary membranes are then assembled to each other to cover the carrier structure and made on a set of prefabricated panels.

Each prefabricated panel 100 is generally in the form of a quadrilateral, and for most of the rectangular shape, the primary thermal insulation element 1 and the secondary thermal insulation element 2 each have substantially parallel sides in the plan view. Representing the shape of the first rectangle and the shape of the second rectangle, the length and / or width of the first rectangle is smaller than the corresponding dimension of the second rectangle. The secondary membrane 20 is, for example, the portion of the secondary insulation element 2 which protrudes beyond the primary insulation element 1 in the plane of each panel having the same dimensions as the secondary insulation element 2. 3) present on the phase. The secondary film 20 covering this portion 4 is exposed to form a peripheral margin 23 lying in the plane of the panel shown in FIG.

Peripheral slack 23 of adjacent panels 100a, 100b, and sidewalls 4 of primary thermal insulation elements 1 of adjacent panels 100a, 100b may extend over the entire length, width, or height of the tank. It defines the passage 5 which can be.

This passage 5 is filled before installing the primary membrane, providing the continuity of the seal provided by the panel 100. The continuity of the primary insulating barrier is ensured by inserting the block into the passage 5.

In order to ensure the continuity of the sealing of the secondary membrane 20 at the junction between the two adjacent panels 100a, 100b and before installing the block in place, the adjacent peripheral margins 23 are provided with adjacent margins ( Covered in another layer of material formed by a strip of flexible sheet 7 over 23), this strip of flexible sheet 7 comprises at least one continuous fine metal foil.

The strip 7 of flexible sheet may be joined by a coating 8 attached to a support formed by adjacent margins 23 of the secondary membrane 20 of panels 100a and 100b to provide a seal. There is a need.

The continuity of the secondary insulating barrier 2 is achieved by inserting the insulating material 6 between the adjacent secondary insulating elements 2 of the adjacent panels 100a, 100b.

Assembling such panels requires very rigorous work techniques to be implemented, which requires great accuracy in assembly to ensure that the tank is insulated and leak-proof.

Bonding of the strip 7 of flexible sheet and sealing achieved between two adjacent panels 100a, 100b allows the assembly of panels to receive the various stresses that are directly received between the panels and to continue doing so over time, It must be particularly precise.

Thus, the bonding zones between adjacent panels are zones subject to various traction stresses and therefore must exhibit mechanical strength over time sufficient to avoid compromising the continuity of the secondary sealing barrier.

By way of example, the secondary membrane 20 comprises at least one fine metal foil 24, for example aluminum foil, which is between the glass fiber fabrics 25, 26 and the foil 24. Adhesively inserted between the two glass fiber fabrics 25, 26 by means of a binder based on polyamide or polyester, which provides adhesion to the membrane, for example, the membrane 20 forms a support for adhesion. A rigid sheet having a clearance 23 is formed.

By way of example, the strip 7 of flexible sheet also comprises at least one fine metal foil 71, for example aluminum foil, which metal foil 71 comprises glass fiber fabrics 72, 73 and a metal foil. An adhesive is inserted between the two glass fiber fabrics 72, 73 by a binder that provides adhesion between the 71.

The bonding criteria recommended to be achieved when joining the flexible sheet strip 7 on the support 23 in this example are the shear strength at cooling of 3.5 MPa (-170 ° C.), cooling greater than 3 MPa (− 170 degrees Celsius), orthogonal traction strength and rupture indicating the appearance of adhesive rupture.

If the bonding of the flexible sheet strip 7 on the support 23 is not satisfactory, it is necessary to remove the strip 7 and the adhesive coating 8 between the flexible sheet strip 7 and the support 23. . The panels are then in the configuration shown in FIG. 2, without the strip 7 and with the coating 8 remaining to be removed from the support 23.

The method and associated apparatus of the present invention serve to enable the new flexible strip 7 to stick to it, especially in the situation of restoring the support 23.

The coating 8 used to bond the flexible strip 7 onto the support 23 has a glass transition temperature (Tg) measured, for example, by differential enthalpy analysis (DEA) of about 73 ° C-74 ° C. And a resin of epoxy type or two-component polyurethane type having a flow temperature (Te) of about 190 ° C. By way of example, the support 23 and membrane 20 described above are sold under the trade name Triplex and can withstand temperatures of 100 ° C. for 30 minutes without physical deterioration or modification to the adhesion properties. The given temperature applies to the same exposure time.

Thus, in this particular application, heating the coating 8 to about 20 ° C. to 25 ° C. above its glass transition temperature (Tg) causes the coating to change to its rubbery state and the support is not subjected to a temperature that can lead to degradation. Do not. Thus, the coating elevated to a temperature of about 90 ° C.-100 ° C. can be removed quickly and immediately by manual mechanical scraping, the coating being passed through a putty knife or any other equivalent means known to those skilled in the art. Comes out as crumbs in the city

Details of the apparatus associated with this method for this particular use are as follows.

In the first apparatus of the present invention, a heat stripper having a heating temperature of 350 ° C. has abutting portions laterally positioned laterally at its ends for delivering hot air. This abutment can bear against the surface to be treated on the support, the hot air sending end of the heat stripper being 50 mm from the surface of the coating 8 in the direction in which the hot air is sent out from its hot air sending end. To stay on the street. The heat stripper preferably also has a flat outlet nozzle which forms its hot air sending end. The coating is then heated by holding a heat exfoliator orthogonally over the surface, in a direction in which hot air is only sent out for heating without a diffusion over the support, if it represents a region where it has no coating, and a mechanical scrap Ping quickly removes the coating from the heated zone. During the operation of heating the coating, it is recommended to check the temperature of the support regularly by a laser thermometer, for example to ensure that the temperature of the support does not rise above the recommended value.

If a large strip of resin coating of epoxy or two-component polyurethane type has to be removed from the support to be reused, it may be advantageous to use the second device of the invention. If the flexible sheet strip is still in place, a flat heater tool is positioned directly on the zone. If the flexible sheet is no longer in place, a protective film, such as a polyan film, is placed between the flat heater tool and the coating before placing the heater device in place.

The flat heater device is advantageously a variant of the pressure applying device used to fix the strip, as used in the tank manufacturing method described in French patent application FR-A-2 868 060, filed in the name of the applicant. Can be. Such a pressure application device comprises at least one sealed chamber defined by a pressurizer shoe and a compressible wall made of, for example, a compressible block of foam. Means are provided for evacuating the sealed chamber through the duct to compress the wall of the chamber. The device is held against the panel, for example, by a blade spread into a groove 103 provided between the inner plate 102 and the primary thermal insulation element 1. Depressurization of the chamber causes the pressurizer shoe to be moved against the coating 8 and pressurized. Venting the chamber allows the pressurizer shoe to be moved away from the coating. The chamber and associated pressurizer shoes are provided for each clearance 23, for example.

At the contact surface next to the support 23, the pressure applying device is provided with at least one mat for heating to 100 ° C., for example. Thus, after setting the device under pressure, the zone to be treated is heated at 110 ° C. for about 10 minutes. In this way, the temperature of the coating rises towards 100 ° C., and the coating changes to a rubber state, so that once the pressure application tool is recovered and the flexible strip or protective film is removed, the treated coating is subjected to mechanical scraping. Enable to receive. Advantageously, in this technique, removing the flexible strip or protective film serves to provide a first operation of peeling off the coating to be removed.

The third device associated with the method and shown in FIG. 3 comprises a box 30 located on the area to be treated and comprising a heat stripper. The box 30 has a heat stripper (not shown) in its top that is heated to a temperature of about 500 ° C. By distributing the inlet for the cold air and the outlet for the hot air over the box 30, the air heated by the heat stripper allows the coating 8 to reach a temperature of about 90 ° C. in about 4 to 5 minutes. do. This is then sufficient to move the box 30 onto another zone for processing and immediately remove the heated coating by manually applied scraping. By way of example, the box can be made of plywood-type wood material and can exhibit dimensions of about 44 cm long, 23 cm high, and 13 cm wide. An opening 31 provided in the inclined side 39 forms an acute angle with the adjacent upper side 37 and the adjacent lower side 38 of the box 30 such that the hot air is opposed to the bottomless side of the box 30 ( The heat stripper can be positioned in such a way that it is sent in an inclined direction toward 32). The cold air inlet 33 is provided in the lower side portion 38 below the zone 34 for receiving the heat stripper. In order to limit the temperature inside the box 30, a hot air outlet 35 is provided in the opposite side 36 facing the cold air inlet 33, the hot air outlet 45 receiving the heat stripper and the same. At the end spaced from the region 34 for the purpose, it is provided in the upper surface 37 of the box.

In an advantageous manner in terms of safety, the support 43 for the heat stripper can be provided on the side close to the face 39 at the outside of the box 30.

The support frame (not shown in the figure) must be treated by applying lateral pressure via a member for pressing against the side wall 4 in the region 8 to be treated when the region is located in the narrow passageway 5. It can be provided to block the box 30 in a safe manner on the area.

According to the present invention, the coating adhered to the support formed on the surface of the glass fiber based fabric can be removed without the physical deterioration of the support and the deterioration of the adhesive properties.

Claims (14)

An adhesive coating removal method for removing an adhesive coating from the surface of adjacent margins of secondary sealing films of adjacent wall panels of a tank for containing liquefied gas, Each wall panel comprises a secondary thermal insulation element, a primary thermal insulation element and said secondary sealing film positioned between these two elements in the thickness direction of the wall panel, The primary thermal insulation element has at least one dimension other than the thickness smaller than the thickness of the secondary thermal insulation element, in order to define the margin of the secondary sealing film, The margin of the secondary sealing membrane extends beyond the primary insulation element in the direction of the dimensions, The surface consists of at least one fabric based on glass fibers, To remove the adhesive coating from the surface, applying the at least one heating parameter for heating the adhesive coating, the adhesive coating is higher than the glass transition temperature (Tg) of the adhesive coating and the viscous flow temperature (Te) of the adhesive coating Heating to a lower temperature, the heating parameter is selected from an adhesive coating heating temperature lower than the physical degradation temperature of the surface and an adhesive coating heating time shorter than the physical degradation time of the surface, Adjacent margins of the secondary sealing films are covered by a layer of material formed by the strip of flexible sheet so as to be sealed, and the strip of flexible sheet is connected to adjacent margins of the secondary sealing films by a new adhesive coating layer. And a new adhesive coating layer is adhered to the support formed by adjacent margins of the secondary sealing films of the wall panels, and wherein the strip of flexible sheet comprises at least one continuous fine metal foil. The method of claim 1, wherein the adhesive coating is maintained at a temperature within the range of 90 ° C. to 110 ° C. for a minimum period of 3 minutes and a maximum period of 15 minutes. The method of claim 1, wherein the adhesive coating is immediately removed in a mechanical manner by scraping after the heating step. The method of claim 3, wherein the scraping is performed manually using a tool comprised of a putty knife. The method of claim 1, wherein the adhesive coating is an epoxy or polyurethane type resin. The adhesive coating of claim 1, wherein the secondary sealing film comprises a metal foil bonded by a binder between two glass fiber fabrics, one of the two glass fiber fabrics forming the surface. How to remove. The method of claim 6, wherein the metal foil of the secondary sealing film is formed of aluminum. The method of claim 6, wherein the binder is based on polyamide or polyester. The method of claim 1 or 2, wherein at least one continuous fine metal foil of the strip of flexible sheet is sandwiched between two glass fiber fabrics of the strip of flexible sheet by a binder, the binder being flexible A method of removing an adhesive coating that bonds between glass fiber fabrics of a strip of a sheet and a fine metal foil of a strip of a flexible sheet. The method of claim 9, wherein the at least one continuous fine metal foil of the strip of flexible sheet is an aluminum foil. An adhesive coating removal device for removing the adhesive coating so that the adhesive coating removing method according to claim 1 is carried out, The adhesive coating consists of an epoxy or polyurethane type resin adhered to a surface of at least one fabric, the at least one fabric being glass fibers of adjacent margins of secondary sealing films of adjacent wall panels of the tank for containing liquefied gas. Based on While applying at least one heating parameter for heating the adhesive coating, the adhesive coating is heated to a temperature higher than the glass transition temperature (Tg) of the adhesive coating and lower than the viscosity flow temperature (Te) of the adhesive coating, and the adhesive coating The adhesive coating removal apparatus includes a heat stripper having at least one end including an outlet nozzle for delivering hot air, and the thermal peeler also includes an end for delivering hot air. And at least one abutment laterally attached to and supported against the surface of the adhesive coating so as to remain above the minimum predetermined distance from the surface of the adhesive coating and supported against the surface of the adhesive coating. Adhesive coating heating temperature lower than the physical degradation temperature of the surface and shorter than the physical degradation time of the surface Adhesive coating removing device, it is selected from the tinted coating heating time. An adhesive coating removal device for removing the adhesive coating so that the adhesive coating removing method according to claim 1 is carried out, The adhesive coating consists of an epoxy or polyurethane type resin adhered to a surface of at least one fabric, the at least one fabric being glass fibers of adjacent margins of secondary sealing films of adjacent wall panels of the tank for containing liquefied gas. Based on While applying at least one heating parameter for heating the adhesive coating, the adhesive coating is heated to a temperature higher than the glass transition temperature (Tg) of the adhesive coating and lower than the viscosity flow temperature (Te) of the adhesive coating, and the adhesive coating The adhesive coating removal apparatus includes a flat tool for heating the adhesive coating in indirect contact with the adhesive coating, to remove it from the surface, wherein the heating parameters include an adhesive coating heating temperature lower than the physical degradation temperature of the surface and the The adhesive coating removal apparatus is selected from the adhesive coating heating time shorter than the physical degradation time of the surface. The apparatus of claim 12, further comprising means for pressing the flat tool toward the adhesive coating. An adhesive coating removal device for removing the adhesive coating so that the adhesive coating removing method according to claim 1 is carried out, The adhesive coating consists of an epoxy or polyurethane type resin adhered to a surface of at least one fabric, the at least one fabric being glass fibers of adjacent margins of secondary sealing films of adjacent wall panels of the tank for containing liquefied gas. Based on Applying at least one heating parameter for heating the adhesive coating, the adhesive coating is heated to a temperature higher than the glass transition temperature (Tg) of the adhesive coating and lower than the viscosity flow temperature (Te) of the adhesive coating, thereby In order to remove from the surface, the adhesive coating removal apparatus includes a heat stripper located in a bottomless box having a cold air inlet and a hot air outlet, and the end of the heat stripper is used to remove hot air from the bottomless area of the box. An outlet nozzle for delivering towards at least a portion, wherein the heating parameter is selected from an adhesive coating heating temperature lower than the physical degradation temperature of the surface and an adhesive coating heating time shorter than the physical degradation time of the surface Removal device.

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