Glue finishing method for FSB cross lap joint area during ABM automatic adhesion
By using stainless steel scrapers to trim the glue in the FSB cross overlap area during the ABM automatic adhesion process, the problem of unqualified glue width and thickness is solved, ensuring the adhesion quality and normal progress of subsequent construction.
Patent Information
- Application Number
- CN202411873842.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-04-11
AI Technical Summary
During the ABM automatic adhesion process, the glue width and thickness of the FSB cross overlap area are difficult to meet the minimum requirements, resulting in adhesion defects and glue overflow problems, affecting the continuity of the secondary screen wall and subsequent construction.
A glue trimming method for the FSB cross overlap area when ABM is automatically bonded is adopted. The glue is rolled out in the bonding area through a stainless steel scraper to ensure that the glue width and thickness meet the standards, and the glue overflow area outside the FSB is treated to prevent glue from accumulation.
It effectively solves the problem of unqualified glue width and thickness, ensures the stability and consistency of adhesion quality, avoids the accumulation of glue on the outside of FSB, and ensures the normal installation of subsequent TBP.
Smart Images
Figure CN119793843A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a method for glue trimming of a FSB cross-lapping area during ABM automatic bonding. Background Art
[0002] The secondary barrier bonding process is one of the key processes of the Mark III series LNG cargo containment system. The FSB is glued to the prefabricated RSB on the insulation board to make the entire secondary barrier continuous. The secondary barrier bonding length of a single ship cargo containment system is 45,147 meters, of which the ABM automatic bonding length is 32,343 meters, accounting for 72%. Since there are two layers of FSB in the overlap area, the risk of quality problems in the bonding is high, so the bonding quality of the overlap area needs to be strictly controlled.
[0003] Due to the different flatness and layer differences between the insulation boards, the ABM automatic bonding results vary. For areas with large layer differences, bonding defects may occur. Especially in the cross-shaped area formed by four insulation boards, the following bonding defects may occur when FSB is cross-lapped: 1. The glue width in the local area below the FSB is insufficient, which is lower than the minimum bonding width requirement of 105mm.
[0004] 2. The glue in the local area below the FSB is thin or thick, lower than the standard requirement of 0.2mm or higher than 1.2mm.
[0005] 3. There is a lot of glue overflow on the outside of FSB, which is higher than the surface of FSB.
[0006] Due to the characteristics of FSB and glue, after ABM bonding, the glue is covered by FSB but still in a flowable state. The existing glue trimming method has poor reliability and unstable results, and cannot guarantee that the minimum bonding width requirement is met after glue trimming.
[0007] Professional term explanation: 1. Insulation board: The main insulating component of the cargo containment system, divided into two parts: the main layer and the secondary layer, composed of plywood, reinforced polyurethane foam, RSB, etc. (such as attached Figure 1 as shown).
[0008] 2. Rigid secondary shield (RSB): A three-layer structure made of two layers of glass fiber cloth and an intermediate aluminum foil cloth. It is not easy to deform or bend. As the main component of the secondary shield, it is usually prefabricated on the surface of the secondary layer of the insulation board (such as the attached Figure 2 as shown).
[0009] 3. Flexible secondary screen (FSB): A three-layer structure made of two layers of glass fiber cloth and an aluminum foil cloth in the middle, with good flexibility or flexibility. It is overlapped and bonded to the RSB to ensure the continuity of the secondary screen.
[0010] 4. Automatic bonding machine (ABM): An automated device used for bonding FSB. It is generally composed of five main units: a glue supply unit that provides glue, a conveying unit that transports and lays FSB during bonding, a hot pressing unit that heats and pressurizes the bonding area, a host unit that drives the machine, and a control unit that controls all limiting parameters. Summary of the invention
[0011] Since secondary screen wall bonding is one of the key construction processes of the cargo containment system of LNG carriers, and the ABM automatic bonding length accounts for more than 70% of the total bonding length, automatic bonding is the core technology for the construction of the cargo containment system of LNG carriers. In order to solve the above problems, the present invention provides a method for glue trimming of the FSB cross overlap area during ABM automatic bonding, and the technical solution adopted is: Provided is a glue trimming method for the cross-lapping area of FSB during ABM automatic bonding, wherein four insulating boards form a cross-shaped bonding area, two FSBs of the same width are bonded in the bonding area, and a single strip of glue is squeezed on a single insulating board along the FSB bonding direction in the bonding area, the glue is arranged longitudinally, and the width is 6-8 mm; Glue extrusion and FSB laying are carried out simultaneously. One FSB is bonded along one path of the bonding area, and then another FSB is bonded along the other path of the bonding area. The two FSBs overlap each other at the intersection. After the two FSBs are bonded, at the overlap, use a stainless steel scraper to roll the glue below the FSB in the current bonding direction from the edge of the first FSB to the center of the first FSB, and use a stainless steel scraper to roll the glue below the FSB in the current bonding direction near the edge to the center of the FSB.
[0012] After finishing, use a flashlight to illuminate the FSB surface for visual inspection to determine whether the glue width is qualified. For areas that cannot be visually judged, use a steel ruler to measure to ensure that the adhesion width meets the standard requirement of 110±5mm; if the inspection fails, repeat the previous step until it passes.
[0013] There is a circle of overflow glue area on the outside of the FSB edge. Use a stainless steel scraper to lift up the polyester film tape and flatten the glue in the overflow glue area on the outside of the FSB along the edge of the FSB. If there is too much glue, you need to scrape off some of the glue and apply the remaining glue close to the insulation board until it is smooth, ensuring that the glue height is less than the FSB surface.
[0014] The above provides a method for glue trimming of the cross-lap area of FSB during ABM automatic bonding. Furthermore, when bonding a single FSB, the end of the FSB is bonded first. After the end is bonded, the rest of the FSB is gradually bonded forward along the current bonding path.
[0015] The above provides a method for glue trimming of the cross-lap area of FSB during ABM automatic bonding. Furthermore, the single-side bonding width of FSB is 110±5mm.
[0016] The above provides a method for trimming glue in the cross-lap area of FSB during ABM automatic bonding. Furthermore, the thickness of the glue below the FSB is 0.2 to 1.2 mm.
[0017] The above provides a method for glue trimming of the cross-lap area of FSB during ABM automatic bonding, and further, the width of FSB is 250mm.
[0018] The present invention can effectively trim the glue to the specified position, meet the requirements of the adhesion width, make the glue evenly distributed, avoid the situation where the local glue is too thick or too thin, and effectively prevent the glue from accumulating on the outside of the FSB and affecting the subsequent installation of the TBP. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a schematic diagram of a cross-shaped bonding area; Figure 2 It is to glue a FSB schematic along one of the ways; Figure 3 It is to glue another FSB schematic on another road; Figure 4-8 It is a schematic diagram of the trimming process; Among them, 1-insulation board, 2-FSB. DETAILED DESCRIPTION
[0020] The present invention will be further described in conjunction with the accompanying drawings.
[0021] Between the four insulating plates, a cross area will appear, such as Figure 1 Here, the FSB bonding method is as follows: a total of two FSBs with a width of 250 mm need to be bonded. After the first FSB is bonded, Figure 2 As shown, the second FSB is bonded in a direction perpendicular to the first FSB. The FSB bonding direction is as shown in the attached Figure 3 shown.
[0022] The installation tolerance of the insulation board (the gap between the two insulation boards) is 30±3mm. According to the technical requirements, the single-side bonding width of the FSB should be 110±5mm (if attached). Figure 3 To ensure the quality of bonding, the glue thickness should be within the range of 0.2-1.2 mm, and 100% of the glue should overflow from the outside of the FSB. In addition, to meet the subsequent TBP construction requirements, the height of the glue overflow on the outside of the FSB should not be higher than the FSB surface.
[0023] During the automatic bonding process, by setting the parameters of ABM, ABM can complete the tasks of extruding strip glue (width about 6 to 8 mm), laying FSB and polyester film tape, and spreading glue under pressure.
[0024] Due to the characteristics of FSB and glue, after ABM bonding, the glue is covered by FSB but still in a flowable state. Based on the above problems, this glue trimming method was invented. The tools required are: stainless steel scraper, flashlight, steel ruler. The construction is carried out by the bonding worker, and the specific operation method is as follows: 1. After the ABM passes the cross-lap area, use a stainless steel scraper to roll some glue from the edge of the cross-lap area to the gap of the insulation board (such as the attached Figure 4 The purpose of this operation is to leave a gas passage in the area between the two glues to prevent glue from accumulating in the gaps of the insulation board so that the internal gas cannot be discharged and form large bubbles (such as the attached Figure 5 At the same time, this operation can effectively fill the concave position of the first layer of FSB adhesion with glue.
[0025] 2. Use a stainless steel scraper to roll some glue from the edge of the second FSB to the gap of the insulation board (such as the attached Figure 6 The purpose of this operation is to fill the glue into the position where the gas was originally located and drive the gas out through the gas channel to the cross-lap area (see attached Figure 7 At the same time, this operation can effectively increase the width of the glue and make the glue thickness uniform, preventing it from being too thick or too thin.
[0026] 3. Use a flashlight to illuminate the FSB surface, analyze the glue position by the surface profile, and conduct a visual inspection to determine whether the glue width is qualified. For areas that cannot be visually judged, a steel ruler must be used for measurement to ensure that the adhesion width meets the standard requirement of 110±5mm (if unqualified, repeat steps 1 to 2 until qualified).
[0027] 4. Use a stainless steel scraper to lift up the polyester film tape and flatten the excess glue on the outside of the FSB along the edge of the FSB (if attached). Figure 8 If there is too much glue, you need to scrape off some of it and apply the remaining glue to the insulation board until it is smooth, making sure that the glue height is not higher than the FSB surface. The purpose of this operation is to prevent the glue from accumulating on the outside of the FSB, making the glue too thick and making it impossible to install the TBP.
Claims
1. A method for glue trimming of FSB cross-lapping area during ABM automatic bonding, characterized in that: Four insulating boards form a cross-shaped bonding area, and two FSBs of the same width are bonded in the bonding area. In the bonding area, a single strip of glue is squeezed on the single-side insulating board along the FSB bonding direction. The glue is arranged longitudinally and has a width of 6~8mm; Glue extrusion and FSB laying are carried out simultaneously. One FSB is bonded along one path of the bonding area, and then another FSB is bonded along the other path of the bonding area. The two FSBs overlap each other at the intersection. After the two FSBs are bonded, at the overlap, use a stainless steel scraper to roll the glue below the FSB in the current bonding direction from the edge of the first FSB to the center of the first FSB, and use a stainless steel scraper to roll the glue below the FSB in the current bonding direction from the edge to the center of the FSB; After finishing, use a flashlight to illuminate the FSB surface for visual inspection to determine whether the glue width is qualified. For areas that cannot be visually judged, use a steel ruler to measure to ensure that the adhesion width meets the standard requirement of 110±5mm; if the inspection fails, repeat the previous step until it passes; There is a circle of overflow glue area on the outside of the FSB edge. Use a stainless steel scraper to lift up the polyester film tape and flatten the glue in the overflow glue area on the outside of the FSB along the edge of the FSB. If there is too much glue, you need to scrape off some of the glue and apply the remaining glue close to the insulation board until it is smooth, ensuring that the glue height is less than the FSB surface.
2. The method for glue trimming of FSB cross-lapping area during ABM automatic bonding according to claim 1, characterized in that: When bonding a single FSB, the end of the FSB is bonded first. After the end is bonded, the rest of the FSB is bonded gradually along the current bonding road.
3. The method for glue trimming of FSB cross-lapping area during ABM automatic bonding according to claim 1, characterized in that: The unilateral adhesion width of FSB was 110±5mm.
4. The method for glue trimming of FSB cross-lapping area during ABM automatic bonding according to claim 1, characterized in that: The glue thickness below the FSB is 0.2 to 1.2 mm.
5. The method for glue trimming of FSB cross-lapping area during ABM automatic bonding according to claim 1, characterized in that: The width of FSB is 250mm.