KR101163631B1 - Method for attaching triplex using a heating pad - Google Patents

Abstract

PURPOSE: A triplex sticking method using a heating pad is provided to control temperature and apply optimal hardening temperature and time according to various types of adhesives. CONSTITUTION: A triplex sticking method using a heating pad comprises the following steps: coating adhesive on an insulation panel(S10); laminating the triplex on the spread adhesive(S20); laminating a protective film on the triplex and a heating pad on the triplex(S50); heating the adhesive by providing electricity to a heating layer of the heating pad while pressurizing the heating pad(S60); separating the heating pad after required time for hardening the adhesive is expired(S70); and removing the protective film after separating the heating pad.

Description

Triplex attachment method using heating pad {METHOD FOR ATTACHING TRIPLEX USING A HEATING PAD}

The present invention relates to a method of attaching a triplex using a heating pad, and more particularly, to a method of attaching a triplex on an insulating panel using a heating pad in the manufacture of a barrier used in a LNG storage tank. .

Natural gas is transported in a gaseous state through onshore or offshore gas piping, or to a distant consumer while stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

Structures for transporting or storing liquefied natural gas, such as LNG carriers for loading LNG into the sea by loading LNG and transporting the sea, are also referred to as storage tanks (commonly referred to as cargo holds) that can withstand the cryogenic temperatures of liquefied natural gas. ) Is installed.

These storage tanks can be classified into independent tank type and membrane type depending on whether the load of cargo is directly applied to the insulation. Membrane type storage tanks are generally divided into GTT NO 96 type and Mark III type, and independent tank type storage tanks are divided into MOSS type and IHI-SPB type.

The structure of the membrane type storage tank is described in U.S. Patent Nos. 6,035,795, 6,378,722, 5,586,513, and U.S. Patent Publication Nos. 2003-0000949 and the like, and Korean Patent Publication Nos. 10-2000-0011347 and 10-2000-0011346, and the like. It is described. In addition, the structure of the independent tank type storage tank is described in Korean Patent Nos. 10-15063 and 10-305513.

The NO 96 type storage tank comprises a primary sealing wall and a secondary sealing wall made of Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, and a perlite on a plywood box. The primary heat insulation wall and the secondary heat insulation wall formed by arranging the insulation boxes made by filling the heat exchanger are alternately stacked on the inner surface of the hull.

As shown in FIGS. 1 and 2, the Mark III type storage tank includes a secondary sealing layer 20 and a triplex formed of a primary sealing wall 20 formed of a stainless steel membrane having a thickness of about 1.2 mm. The sealing wall 25 and the primary heat insulating wall 21 and the secondary heat insulating wall 26 made of polyurethane foam or the like are alternately stacked on the inner surfaces 1 and 2 of the hull. .

In case of Mark III type, the secondary insulation wall 26, the secondary sealing wall 25, and the primary insulation wall 21 are modularly used to form one insulation panel, and a plurality of insulation panels are formed on the inner surface of the hull. After arranging on, the barrier structure is completed by laminating the primary sealing wall 20.

The insulation panel may be divided into a planar panel for forming a flat part of the storage tank and a corner panel for forming a corner part of the storage tank according to the shape, and the corner panel is a 3-way corner part having three sides. It can be subdivided into a panel, a 90 degree corner panel where two sides are gathered at a 90 degree angle, and a 135 degree corner panel where two sides are gathered at a 135 degree angle.

In order to fabricate the corner panel, the flat panel panels are bonded to each other at an angle, and the triplex is laminated on the surfaces of the panels. The triplex is bonded by an adhesive, which heats and presses the triplex using a heating press plate to shorten working time and improve bondability. However, a difference occurs in the fluidity of the adhesive according to the temperature of the pressing plate. When pressing the pressure plate in such a state, the adhesion of the triplex is not uniformly performed, such as wrinkles on the surface of the adhesive part due to the difference in the fluidity of the adhesive. there is a problem.

In addition, the types of adhesives currently used for triplex bonding are gradually diversified. In consideration of the viscosity change characteristics of the adhesives, a heating apparatus capable of applying an optimum curing temperature and time according to different kinds of adhesives and Research on the heating method needs to be done.

The present invention for solving the above problems, the temperature control is possible to apply the optimum curing temperature and time to various kinds of adhesive, and the heating pad so that the adhesive surface of the triplex can be formed uniformly It is to provide a method for attaching a triplex on the insulation panel using.

According to an aspect of the present invention for achieving the above object, as a method for attaching a triplex on the insulation panel using a heating pad in the manufacture of the insulation panel used in the LNG storage tank, the adhesive on the insulation panel Applying; Laminating the triplex on the applied adhesive; Stacking the heating pads on the triplex; Heating the adhesive by supplying power to the heat generating layer of the heating pad while pressing the heating pad toward the triplex; Separating the heating pad after the time required for curing of the adhesive has elapsed; Provided is a triplex attachment method comprising a.

Prior to laminating the heating pad on the triplex, it is preferable to laminate a protective film for protecting the triplex.

Prior to laminating the heating pad on the triplex, it is preferable to laminate the pressure distribution sheet so that the pressure applied to the adhesive can be evenly distributed.

After removing the heating pad, it is preferable to remove the protective film.

After removing the heating pad, it is preferable to remove the pressure distribution sheet.

The applying of the adhesive may include attaching an anti-smear tape along a boundary line on which the adhesive is to be applied on the insulation panel so that the adhesive does not spread, and removing the anti-smear tape after applying the adhesive. .

In the step of heating the adhesive by supplying power to the heat generating layer of the heating pad while pressing the heating pad toward the triplex, the power is turned on or off based on the temperature information detected by the temperature sensor mounted on the heating pad. desirable.

According to the present invention as described above, it is possible to control the temperature to apply the optimum curing temperature and time to various kinds of adhesive, and to insulate using the heating pad to uniformly form the surface of the adhesive portion of the triplex A method of attaching a triplex on a panel can be provided.

Accordingly, according to the triplex attachment method according to the present invention, the viscosity change characteristics according to the temperature of each adhesive type in the state that the type of adhesive for bonding the triplex in the manufacture of the secondary barrier installed in the cargo hold of the LNG carrier is diversified By performing the adhesive heating according to the curing temperature pattern in consideration of the foaming on the surface of the triplex, it is possible to cure the adhesive under optimal conditions by preventing the occurrence of uncured, it is possible to shorten the curing time for the triplex adhesive.

1 and 2 are a cross-sectional view and a perspective view for explaining the structure of the Mark III type storage tank of the low temperature liquid cargo storage tank according to the prior art,
3 is a perspective view for explaining the structure of a heating pad used for bonding a triplex according to the present invention;
4 is a plan view of a heating pad used to bond a triplex according to the present invention;
5 is a block diagram for explaining a triplex attachment method using a heating pad according to the present invention, and
6 is a graph showing an example of a temperature application pattern by a heating pad according to the present invention.

Hereinafter, a triplex attachment heating pad and a triplex attachment method using the heating pad according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

As shown in Figures 3 and 4, the heating pad 100 for triplex attachment according to the present invention, the lower plate 101 is disposed so as to face the triplex side during the adhesive processing of the triplex, and the lower plate ( The heat generating layer 102 stacked on the heat generating layer 101 to generate heat, the upper plate 106 stacked on the heat generating layer 102 and on which the temperature sensor 107 is mounted, and the heat generating layer 102 are connected to a power source. The controller 110 is connected via a cable 121 and connected to the temperature sensor 107 by a cable 122 for a temperature sensor.

In the present specification, the "lower" means the direction toward the triplex adhered on the insulation panel based on the use of the heating panel, and the "upper" means the opposite direction.

In addition, the heating pad 100 for triplex attachment according to the present invention, FIG. 5 such that the temperature detected by the temperature sensor 107 corresponds to the temperature of the adhesive applied to the insulation panel when the heating pad 100 is actually used. A pressure distribution sheet 103, a protective film 104, and a triplex 105 interposed between the heat generating layer 102 and the temperature sensor 107 so as to satisfy the same conditions as the adhesive as described below with reference to the present invention. do.

The lower plate 101 is preferably made to have a flat plate shape of SUS material. The heat generating layer 102 may be formed of a planar heating element, and receives electric power to convert electrical energy into thermal energy to heat the lower plate 101. The lower plate 101 and the heat generating layer 102 cooperate with each other to have a uniform temperature distribution over the entire area with respect to the adhesive for adhering the triplex for the production of the insulating panel.

The top plate 106 is equipped with one or more, preferably three temperature sensors 107. In order to mount the temperature sensor 107, a lower surface of the upper plate 106, that is, a surface facing the heat generating layer 102, may have a recess having a size into which the temperature sensor 107 can be inserted. A groove into which the temperature sensor cable 122 connecting the temperature sensor 107 and the controller 110 may be inserted may be formed.

The controller 110 turns on or off the power supply to the heating layer 102 based on the temperature information detected by the temperature sensor 107 so that the adhesive can maintain the set temperature when the adhesive is cured.

The pressure distribution sheet 103 stacked above the heat generating layer 102 may preferably be a urethane sheet. The protective film 104 laminated above the pressure distribution sheet 103 may preferably be a film of PET material. The triplex 105 laminated on top of the protective film 104 is preferably the same product that is bonded by an adhesive on the insulation panel. The pressure distribution sheet 103, the protective film 104, and the triplex 105 may be applied to and hardened to bond the triplex on an insulating panel, as described later with reference to FIG. 5. In order to make the surrounding environment of the temperature sensor 107 the same, it is laminated in the heating pad 100.

Hereinafter, a method of attaching a triplex by curing an adhesive using a heating pad according to the present invention will be described with reference to FIG. 5.

The subsequent triplex attachment method is described by taking an example of attaching a triplex to a 90 degree corner panel or a 135 degree corner panel among insulation panels of an LNG cargo hold. However, in the triplex attachment method according to the present invention, after attaching the triplex to the flat panel or arranging a plurality of insulating panels on the inner surface of the hull, the respective insulating panels are connected to each other by triplex to seal the second sealing wall. Of course, it can be used in the work to form a.

In the triplex attachment method according to the present invention, by applying an adhesive on the heat insulating panel (S10), by applying a triplex on the applied adhesive (S20), the heating pad used for curing the adhesive on the triplex The adhesive is heated (S50), and the adhesive is heated (S60) by supplying electric power to the heat generating layer of the heating pad while pressing the heating pad toward the triplex by means of a pneumatic press device. After the separation of the heating pad (S70).

According to the present invention, before the step of laminating the heating pad on the triplex, the protective film for protecting the triplex is laminated (S30), and the pressure distribution sheet is laminated so that the pressure applied to the adhesive can be evenly distributed. It is preferable to make it (S40). The protective film may be the same PET film included in the heating pad 100. In addition, the pressure distribution sheet may be made of a material having elasticity such as urethane so that the pressure may be evenly distributed over the entire area when applying pressure to the triplex adhered on the insulation panel.

The protective film protecting the triplex and the pressure distribution sheet for uniformly distributing the pressure are laminated in the heating pad 100 as described above. In addition, the same product as the triplex adhered by the adhesive is also laminated in the heating pad 100.

According to the present invention, the triplex, the protective film, and the pressure distribution sheet laminated on the adhesive applied to the insulation panel are equally stacked between the heating layer 102 and the temperature sensor 107 of the heating pad 100. . Accordingly, the heat of the heating layer and the lower plate can be transferred to the temperature sensor through the same process as the heat is transmitted to the adhesive, so that the temperature of the adhesive and the temperature detected by the temperature sensor are under the same conditions.

After separating the heating pad, the pressure distribution sheet and the protective film are preferably removed. In addition, the anti-spill tape may be attached along the boundary line on which the adhesive is to be applied on the insulation panel so that the adhesive does not spread. This anti-smear tape is removed after applying the adhesive and before adhering the triplex.

6 is a graph showing an example of a temperature application pattern with a heating pad for curing the adhesive.

When the temperature of the adhesive is raised to about 35 to 45 ° C. over a first temperature rise period T1 at room temperature, such as 20 ° C., the temperature is kept constant during the first temperature hold period T2. After the set T2 period, the temperature is increased again to raise the temperature of the adhesive to 50 to 75 ° C over the secondary temperature raising period T3, and the elevated temperature is maintained for the second temperature holding period T4.

In the example shown, T1 may be approximately 20-40 minutes, T2 approximately 10-20 minutes, T3 approximately 10-20 minutes, and T4 approximately 60-180 minutes.

According to the present invention, the curing of the adhesive is completed within a shorter time (for example, 3 hours) at an optimum temperature condition (for example, 55 to 70 ° C) according to the type of adhesive, compared to the conventional curing of the adhesive for 4 hours at 40 ° C. You can do it. In addition, the local heating of the adhesive application site can be minimized heat loss to proceed with the operation, it is possible to prevent the occurrence of bubbles, folded and uncured on the triplex surface.

In addition, according to the present invention, the length of the heating pad can be increased by 2-3 times or more compared with the related art, thereby reducing productivity and improving productivity for the same length.

Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited to the embodiments and drawings described above, and those skilled in the art to which the present invention pertains within the scope of the claims. Various modifications and variations can be made by, of course.

100: heating pad 101: lower plate
102: heating layer 103: pressure distribution sheet
104: protective film 105: triplex
106: upper plate 107: temperature sensor
110: controller 121: power cable
122: cable for temperature sensor

Claims (7)

As a method of attaching a triplex on an insulation panel using a heating pad in the manufacture of the insulation panel used in the LNG storage tank,
Applying an adhesive on the insulation panel;
Laminating the triplex on the applied adhesive;
Stacking the heating pads on the triplex;
Heating the adhesive by supplying power to the heat generating layer of the heating pad while pressing the heating pad toward the triplex;
Separating the heating pad after the time required for curing of the adhesive has elapsed;
Including;
Prior to laminating the heating pad on the triplex, a protective film for protecting the triplex is laminated, and the protective film is removed after removing the heating pad. . delete The method according to claim 1,
Prior to laminating the heating pad on the triplex, the pressure distribution sheet is laminated so that the pressure applied to the adhesive can be evenly distributed. delete The method according to claim 3,
And removing the pressure distribution sheet after removing the heating pad. The method according to claim 1,
The applying of the adhesive may include attaching an anti-spill tape along a boundary line on which the adhesive is to be applied on the insulating panel so that the adhesive does not spread, and removing the anti-spill tape after applying the adhesive. Triplex attachment method. The method according to claim 1,
In the step of heating the adhesive by supplying power to the heating layer of the heating pad while pressing the heating pad toward the triplex, the power is turned on or off based on the temperature information detected by the temperature sensor mounted on the heating pad. Triplex attachment method characterized in that.

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