Building intermediate plate outer film covering process

Abstract

The invention discloses an outer film covering process for a building intermediate plate. The outer film covering process comprises the following steps that S1, the surface of the intermediate plate is cleaned; s2, selecting and pretreating a film coating material; s3, coating an adhesive; s4, laminating, and heating and pressing through hot pressing; and S5, ultraviolet curing is carried out, the film coating material is a high-temperature-resistant polymer film, the ultraviolet curing device has the effects of directly providing external air for the product and discharging air in a main body, and therefore the product is prevented from thermal deformation caused by heat of an ultraviolet generation part. In addition, the effect of improving the curing quality is achieved, and the ultraviolet rays irradiated by the ultraviolet ray generating part can be gathered into the product and cannot be lost by the ultraviolet ray sensing part.

Description

Technical Field

[0001] The invention relates to the field of intermediate boards, and in particular to an external coating process for building intermediate boards. Background Art

[0002] The uses of the intermediate board coating mainly include the following aspects: Waterproof and moisture-proof: The coating can effectively prevent moisture penetration and protect the internal structure of the board. Enhanced durability: Improve the wear resistance and impact resistance of the board and extend its service life. Beautiful decoration: Provide a variety of colors and textures to enhance the visual effect of the building. Heat insulation: Special coating materials can improve the thermal insulation performance of the board and save energy. Anti-corrosion and anti-rust: Suitable for industrial environments, protect the board from chemical corrosion. Easy to clean: The coating surface is smooth, easy to clean and maintain, and maintains a good appearance.

[0003] During the coating process, the middle plate needs to be exposed to ultraviolet light. When ultraviolet curing materials are used as adhesives, the adhesive is cured by irradiating the substrate with ultraviolet light. In this case, an ultraviolet curing device is used, and the product is cured by ultraviolet light while being placed on a conveyor belt. The general ultraviolet curing machine has the problem that the ultraviolet light generated by the ultraviolet curing lamp cannot be concentrated into the product, resulting in low curing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a building intermediate panel outer coating process to solve the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A building intermediate panel outer film coating process comprises the following steps:

[0007] S1: Clean the surface of the middle plate;

[0008] S2: Select and pre-treat the coating material;

[0009] S3: Apply adhesive;

[0010] S4: Laminating and pressing by heat and heat pressing;

[0011] S5: UV curing.

[0012] Preferably, the coating material is a high temperature resistant polymer film;

[0013] The hot pressing temperature is 120°C to 150°C.

[0014] Preferably, in step S1, an industrial cleaning agent is required to clean the surface of the plate;

[0015] In the step S2, the film material is chemically treated before use to improve the bonding performance;

[0016] In the steps S3 and S4, the laminating operation is performed using automated equipment to ensure uniformity and accuracy;

[0017] In the curing step S5 of the steps, ultraviolet curing equipment is used to ensure the durability of the film material.

[0018] Preferably, the ultraviolet curing equipment includes a mounting frame, both ends of the mounting frame are fixedly connected to mounting plates, a driving roller is rotatably connected between the two mounting plates, the two driving rollers are connected by a driving belt, a single-axis motor is fixedly connected to the mounting plate, and the single-axis motor is fixedly connected to the driving roller.

[0019] Preferably, a reflective plate is fixedly connected to the top of the mounting plate;

[0020] The top of the reflector is fixedly connected with a mounting ring, and the interior of the mounting ring is fixedly connected with a curing cover;

[0021] An ultraviolet curing lamp is arranged inside the curing cover, and the ultraviolet curing lamp is fixedly connected to the curing cover through a connecting rod. A first rotating shaft is arranged at the bottom end of the ultraviolet curing lamp, and an arc plate is fixedly connected to the top of the first rotating shaft. A cleaning wipe is fixedly connected inside the arc plate, and the cleaning wipe is in contact with the surface of the ultraviolet curing lamp;

[0022] The first rotating shaft is fixedly connected with a second bevel gear, the second bevel gear is meshed with the first bevel gear, the first bevel gear is fixedly connected with a second rotating shaft, and the second rotating shaft is rotatably connected with the curing cover and the mounting ring.

[0023] Preferably, a mounting frame is fixedly connected inside the curing cover, and a dual-axis motor is fixedly installed between two mounting frames;

[0024] The bottom end of the dual-axis motor is fixedly connected to a driving shaft, the bottom end of the driving shaft is fixedly connected to a worm, the worm is meshed with a worm wheel, the worm wheel is fixedly connected to a reciprocating screw, the reciprocating screw is rotatably connected to the curing cover, the reciprocating screw is fixedly connected to a sliding rod, the sliding rod is slidably connected to a slide plate, the slide plate is fixedly connected to a rack, the rack is fixedly connected to a threaded plate, and the threaded plate is threadedly connected to the reciprocating screw;

[0025] The rack is meshed with a first gear, the first gear is fixedly connected with a third rotating shaft, and the third rotating shaft is fixedly connected to the arc plate;

[0026] The top end of the dual-axis motor is fixedly connected with a fan blade.

[0027] Preferably, an extension rod is fixedly connected to the driving shaft, and a second magnetic block is fixedly connected to the extension rod;

[0028] The curing cover is slidably connected to a driving frame, the driving frame is fixedly connected to a limiting plate, the driving frame is sleeved with a first spring, and the two ends of the first spring are respectively fixedly connected to the limiting plate and the curing cover;

[0029] The driving frame is fixedly connected with a hose, one end of the hose is connected with a fixed cover, and the other end of the driving frame is fixedly connected with a filter cover;

[0030] The driving frame is fixedly connected with a first magnetic block.

[0031] Preferably, a plurality of support frames are fixedly connected to the bottom of the mounting plate;

[0032] The support frame is fixedly connected with a fixing box, the fixing box is rotatably connected with two screws inside, the two screws have opposite threads, a threaded block is threadedly connected with the screw, the threaded block is slidably connected with the fixing box, a tilting block is fixedly connected with the top of the threaded block, a connecting column is fixedly connected with the tilting block, and a positioning frame is fixedly connected with the connecting column;

[0033] The screw rod and the second rotating shaft are both fixedly connected with pulleys, and the two pulleys are connected by a connecting belt.

[0034] Preferably, the fixing box is provided with a groove, a telescopic rod is fixedly connected inside the groove, a cleaning brush is fixedly connected to the top of the telescopic rod, a second spring is sleeved on the telescopic rod, and both ends of the second spring are respectively connected to the cleaning brush and the fixing box.

[0035] Preferably, an auxiliary roller is rotatably mounted inside the mounting frame.

[0036] The beneficial effects of the present invention are:

[0037] 1. The ultraviolet curing device of the present invention has the effect of directly supplying external air to the product and exhausting the air inside the main body, thereby preventing the product from being thermally deformed due to the heat of the ultraviolet generating part. In addition, the present invention also has the effect of improving the curing quality, because the ultraviolet rays irradiated by the ultraviolet generating part can be concentrated into the product without being lost by the ultraviolet sensing part.

[0038] 2. The present invention is driven by a dual-axis motor, which can rotate the fan blades. The rotation of the fan blades will promote the flow of air. The flowing airflow can not only effectively take away heat and avoid heating and deformation, but also promote the treatment of impurities and dust at the middle plate, so that dust and impurities are collected. The drive of the dual-axis motor can also effectively make the filter cover swing continuously, which can better prevent impurities in the filter cover from adhering to the filter cover, thereby ensuring that the filter cover can work better.

[0039] 3. The present invention can make the screw rotate forward and backward continuously through the continuous reciprocating rotation of the second rotating shaft, so that the two positioning frames can continuously approach or move toward each other, thereby firmly stabilizing the middle plate used for conveying the lampshade in the middle of the driving belt, ensuring that the middle plate can be better covered by the lampshade. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Flow chart of the present invention

[0041] Figure 2 It is a schematic structural diagram of the ultraviolet curing device of the present invention;

[0042] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0043] Figure 4 It is a schematic diagram of the internal structure of the curing cover of the present invention;

[0044] Figure 5 for Figure 3 An enlarged schematic diagram of part B;

[0045] Figure 6 for Figure 3 An enlarged schematic diagram of part C of FIG.

[0046] Figure 7 This is a schematic diagram of the connection between the cleaning wipe and the curved plate of the present invention;

[0047] Figure 8 It is a schematic diagram of the connection between the fixing box and the positioning frame of the present invention;

[0048] Fig. 9 It is a schematic diagram of the connection between the cleaning brush and the fixing box of the present invention;

[0049] Fig.10 It is a schematic diagram of the connection between the mounting frame and the auxiliary roller of the present invention.

[0050] Figure numerals: 1, support frame; 2, mounting plate; 3, driving roller; 4, reflector; 5, mounting ring; 6, filter cover; 7, hose; 8, curing cover; 9, positioning frame; 10, single-axis motor; 11, driving belt; 12, mounting frame; 13, tilting block; 14, fixing box; 15, connecting belt; 16, screw; 17, pulley; 18, connecting column; 19, fan blade; 20, driving frame; 21, dual-axis motor; 22, mounting frame; 23, limit plate; 24, connecting rod; 25, ultraviolet curing lamp; 26, The first bevel gear; 27, the first rotating shaft; 28, the second bevel gear; 29, the second rotating shaft; 30, the first spring; 31, the first magnetic block; 32, the second magnetic block; 33, the rack; 34, the driving shaft; 35, the worm; 36, the third rotating shaft; 37, the first gear; 38, the slide plate; 39, the extension rod; 40, the slide bar; 41, the cleaning wipe; 42, the cleaning brush; 43, the threaded block; 44, the telescopic rod; 45, the second spring; 46, the auxiliary roller; 47, the arc plate; 48, the threaded plate; 49, the reciprocating screw. DETAILED DESCRIPTION

[0051] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0052] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0053] Embodiment 1:

[0054] like Figure 1-10 As shown, a building intermediate panel outer film coating process comprises the following steps:

[0055] S1: Clean the surface of the middle plate;

[0056] S2: Select and pre-treat the coating material;

[0057] S3: Apply adhesive;

[0058] S4: Laminating and pressing by heat and heat pressing;

[0059] S5: UV curing.

[0060] The coating material is a high temperature resistant polymer film;

[0061] The hot pressing temperature is 120°C to 150°C.

[0062] In step S1, an industrial cleaning agent is required to clean the surface of the plate;

[0063] In step S2, the membrane material is chemically treated before use to improve the bonding performance;

[0064] In the steps S3 and S4, the laminating operation is performed using automated equipment to ensure uniformity and accuracy;

[0065] In the curing step in step S5, ultraviolet curing equipment is used to ensure the durability of the film material.

[0066] The ultraviolet curing equipment includes a mounting frame 12, both ends of which are fixedly connected to mounting plates 2, a driving roller 3 is rotatably connected between the two mounting plates 2, the two driving rollers 3 are connected by a driving belt 11, a single-axis motor 10 is fixedly connected to the mounting plate 2, and the single-axis motor 10 is fixedly connected to the driving roller 3.

[0067] A reflector 4 is fixedly connected to the top of the mounting plate 2;

[0068] A mounting ring 5 is fixedly connected to the top of the reflector 4, and a curing cover 8 is fixedly connected inside the mounting ring 5;

[0069] An ultraviolet curing lamp 25 is arranged inside the curing cover 8, and the ultraviolet curing lamp 25 is fixedly connected to the curing cover 8 through a connecting rod 24. A first rotating shaft 27 is arranged at the bottom end of the ultraviolet curing lamp 25, and an arc plate 47 is fixedly connected to the top of the first rotating shaft 27. A cleaning wipe 41 is fixedly connected inside the arc plate 47, and the cleaning wipe 41 contacts the surface of the ultraviolet curing lamp 25.

[0070] The first rotating shaft 27 is fixedly connected with a second bevel gear 28 , the second bevel gear 28 is meshed with the first bevel gear 26 , the first bevel gear 26 is fixedly connected with a second rotating shaft 29 , and the second rotating shaft 29 is rotatably connected with the curing cover 8 and the mounting ring 5 .

[0071] A mounting frame 22 is fixedly connected inside the curing cover 8, and a dual-axis motor 21 is fixedly installed between the two mounting frames 22;

[0072] The bottom end of the dual-axis motor 21 is fixedly connected to a driving shaft 34, the bottom end of the driving shaft 34 is fixedly connected to a worm 35, the worm 35 is meshed with a worm wheel, the worm wheel is fixedly connected to a reciprocating screw 49, the reciprocating screw 49 is rotatably connected to the curing cover 8, the reciprocating screw 49 is fixedly connected to a sliding rod 40, the sliding rod 40 is slidably connected to a slide plate 38, the slide plate 38 is fixedly connected to a rack 33, the rack 33 is fixedly connected to a threaded plate 48, and the threaded plate 48 is threadedly connected to the reciprocating screw 49;

[0073] The rack 33 is meshed with a first gear 37, the first gear 37 is fixedly connected with a third shaft 36, and the third shaft 36 is fixedly connected to the arc plate 47;

[0074] The top end of the dual-axis motor 21 is fixedly connected with a fan blade 19 .

[0075] When the above operations are completed and the middle plate is prepared, it is necessary to cure the middle plate by ultraviolet light;

[0076] The single-axis motor 10 is started, and the single-axis motor 10 drives the driving roller 3 to rotate, and the driving roller 3 drives the driving belt 11 to rotate, so that the middle plate can be placed on the driving belt 11 for convenient transportation;

[0077] When the middle plate moves between the two reflective plates 4, it will be illuminated by the ultraviolet curing lamp 25;

[0078] Since the lower half layer inside the curing cover 8 is a reflective layer, the light beam of the ultraviolet curing lamp 25 will be radiated to the middle plate, and by deviating from the middle plate, it will also irradiate the reflective light, and finally all the light will be concentrated on the middle plate, so that the curing effect can be achieved well, and the effect of the ultraviolet curing lamp 25 can be fully utilized;

[0079] The dual-axis motor 21 in the curing cover 8 is started to drive the fan blades 19 to rotate, and the fan blades 19 can extract the heat from the middle plate, thereby preventing the middle plate from bending due to excessive temperature during the curing process;

[0080] The fan blades 19 drive the flow of air and can effectively extract impurities from the middle plate, thereby ensuring the cleanliness of the middle plate.

[0081] Embodiment 2:

[0082] like Figure 1-10 As shown, when other parts are the same as those of the embodiment 1, the difference between this embodiment and the embodiment 1 is that: the driving shaft 34 is fixedly connected to an extension rod 39, and the extension rod 39 is fixedly connected to a second magnetic block 32;

[0083] The curing cover 8 is slidably connected with a driving frame 20, a limiting plate 23 is fixedly connected to the driving frame 20, a first spring 30 is sleeved on the driving frame 20, and two ends of the first spring 30 are respectively fixedly connected to the limiting plate 23 and the curing cover 8;

[0084] A hose 7 is fixedly connected to the driving frame 20, one end of the hose 7 is connected to the fixed cover, and the other end of the driving frame 20 is fixedly connected to the filter cover 6;

[0085] The driving frame 20 is fixedly connected with a first magnetic block 31 .

[0086] When the dual-axis motor 21 is started, it will drive the driving shaft 34 to rotate, and the driving shaft 34 will drive the first magnetic block 31 to rotate. The rotation of the first magnetic block 31 will indirectly act on the second magnetic block 32, so that the second magnetic block 32 drives the driving frame 20 to move. The movement of the driving frame 20 will drive the hose 7 to swing, thereby causing the filter cover 6 to swing, so that a certain amount of impurities attached to the filter cover 6 can fall off, avoiding the phenomenon of clogging caused by all the impurities being attached. Since the filter cover 6 is placed on the outside, it is also convenient for the staff to handle it from the outside, and there is no need to stop the machine for processing, which greatly improves the work efficiency.

[0087] Embodiment 3:

[0088] like Figure 1-10 As shown, when other parts are the same as those of embodiment 1, the difference between this embodiment and embodiment 1 is that: a plurality of support frames 1 are fixedly connected to the bottom of the mounting plate 2;

[0089] The support frame 1 is fixedly connected with a fixing box 14, and two screws 16 are rotatably connected inside the fixing box 14. The two screws 16 have opposite threads. A threaded block 43 is threadedly connected to the screw 16. The threaded block 43 is slidably connected to the fixing box 14. The top of the threaded block 43 is fixedly connected with a tilting block 13, and the tilting block 13 is fixedly connected with a connecting column 18, and the connecting column 18 is fixedly connected with a positioning frame 9;

[0090] The screw rod 16 and the second rotating shaft 29 are both fixedly connected with pulleys 17 , and the two pulleys 17 are connected by a connecting belt 15 .

[0091] The fixing box 14 is provided with a groove, a telescopic rod 44 is fixedly connected inside the groove, a cleaning brush 42 is fixedly connected to the top of the telescopic rod 44, a second spring 45 is sleeved on the telescopic rod 44, and both ends of the second spring 45 are respectively connected to the cleaning brush 42 and the fixing box 14.

[0092] An auxiliary roller 46 is rotatably mounted inside the mounting frame 12 .

[0093] The rotation of the drive shaft 34 will also drive the worm 35 to rotate, the rotation of the worm 35 will drive the worm wheel to rotate, the rotation of the worm wheel will cause the reciprocating screw 49 to rotate, the reciprocating screw 49 will cause the threaded plate 48 to continuously move left and right, the movement of the threaded plate 48 will drive the rack 33 to move, the rack 33 will drive the first gear 37 to rotate, the first gear 37 will drive the third rotating shaft 36 to rotate, the third rotating shaft 36 will drive the arc plate 47 and the cleaning wipe 41 to rotate, so that the ultraviolet curing lamp 25 can be effectively kept clean at all times to prevent the dust absorbed upwards from adhering to the ultraviolet curing lamp 25 and affecting the use of the ultraviolet curing lamp 25;

[0094] The rotation of the arc plate 47 will also cause the first rotating shaft 27 to rotate. The first rotating shaft 27 will drive the second rotating shaft 29 to rotate through the first bevel gear 26 and the second bevel gear 28. The second rotating shaft 29 will drive the screw 16 to rotate through the pulley 17 and the connecting belt 15. The threads of the two screws 16 are opposite, which will cause the two threaded blocks 43 to approach or move away from each other. In this way, the two positioning frames 9 will also approach or move away from each other, thereby effectively limiting the middle plate in the middle of the driving belt 11, so that the middle plate can be better irradiated and cured by the ultraviolet curing lamp 25.

[0095] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A process for coating an intermediate building panel, comprising the following steps: S1: Clean the surface of the middle plate; S2: Select and pre-treat the coating material; S3: Apply adhesive; S4: Laminating and pressing by heat and heat pressing; S5: UV curing.

2. The outer film coating process of the building intermediate plate according to claim 1 is characterized in that: The coating material is a high temperature resistant polymer film; The hot pressing temperature is 120°C to 150°C.

3. The outer film coating process of the building intermediate plate according to claim 1 is characterized in that: In the step S1, an industrial cleaning agent is required to clean the surface of the plate; In the step S2, the film material is chemically treated before use to improve the bonding performance; In the steps S3 and S4, the laminating operation is performed using automated equipment to ensure uniformity and accuracy; In the curing step S5 of the steps, ultraviolet curing equipment is used to ensure the durability of the film material.

4. The outer film coating process of the building intermediate plate according to claim 3 is characterized in that: The ultraviolet curing device comprises a mounting frame (12), both ends of the mounting frame (12) are fixedly connected to mounting plates (2), a driving roller (3) is rotatably connected between the two mounting plates (2), the two driving rollers (3) are connected via a driving belt (11), a single-axis motor (10) is fixedly connected to the mounting plate (2), and the single-axis motor (10) is fixedly connected to the driving roller (3).

5. The outer film coating process of the building intermediate plate according to claim 4 is characterized in that: A reflective plate (4) is fixedly connected to the top of the mounting plate (2); The top of the reflective plate (4) is fixedly connected to a mounting ring (5), and the interior of the mounting ring (5) is fixedly connected to a curing cover (8); An ultraviolet curing lamp (25) is arranged inside the curing cover (8), and the ultraviolet curing lamp (25) is fixedly connected to the curing cover (8) via a connecting rod (24); a first rotating shaft (27) is arranged at the bottom end of the ultraviolet curing lamp (25), and an arc plate (47) is fixedly connected to the top of the first rotating shaft (27); a cleaning wipe (41) is fixedly connected inside the arc plate (47), and the cleaning wipe (41) is in contact with the surface of the ultraviolet curing lamp (25); The first rotating shaft (27) is fixedly connected with a second bevel gear (28), the second bevel gear (28) is meshed with the first bevel gear (26), the first bevel gear (26) is fixedly connected with a second rotating shaft (29), and the second rotating shaft (29) is rotatably connected to the curing cover (8) and the mounting ring (5).

6. The outer coating process of the building intermediate plate according to claim 5 is characterized in that: A mounting frame (22) is fixedly connected inside the curing cover (8), and a dual-axis motor (21) is fixedly installed between two mounting frames (22); The bottom end of the dual-axis motor (21) is fixedly connected to a driving shaft (34), the bottom end of the driving shaft (34) is fixedly connected to a worm (35), the worm (35) is meshed with a worm wheel, the worm wheel is fixedly connected to a reciprocating screw (49), the reciprocating screw (49) is rotatably connected to the curing cover (8), the reciprocating screw (49) is fixedly connected to a sliding rod (40), the sliding rod (40) is slidably connected to a slide plate (38), the slide plate (38) is fixedly connected to a rack (33), the rack (33) is fixedly connected to a threaded plate (48), and the threaded plate (48) is threadedly connected to the reciprocating screw (49); The rack (33) is meshed with a first gear (37), the first gear (37) is fixedly connected with a third rotating shaft (36), and the third rotating shaft (36) is fixedly connected to the arc plate (47); The top end of the dual-shaft motor (21) is fixedly connected with a fan blade (19).

7. The outer film coating process of the building intermediate plate according to claim 6 is characterized in that: An extension rod (39) is fixedly connected to the driving shaft (34), and a second magnetic block (32) is fixedly connected to the extension rod (39); The curing cover (8) is slidably connected to a driving frame (20), a limiting plate (23) is fixedly connected to the driving frame (20), a first spring (30) is sleeved on the driving frame (20), and two ends of the first spring (30) are respectively fixedly connected to the limiting plate (23) and the curing cover (8); A hose (7) is fixedly connected to the driving frame (20), one end of the hose (7) is connected to the fixed cover, and the other end of the driving frame (20) is fixedly connected to the filter cover (6); A first magnetic block (31) is fixedly connected to the driving frame (20).

8. The outer film coating process of the building intermediate plate according to claim 7 is characterized in that: A plurality of support frames (1) are fixedly connected to the bottom of the mounting plate (2); The support frame (1) is fixedly connected to a fixing box (14), the fixing box (14) is rotatably connected to two screw rods (16) inside, the two screw rods (16) have opposite threads, the screw rods (16) are threadedly connected to a thread block (43), the thread block (43) is slidably connected to the fixing box (14), the top of the thread block (43) is fixedly connected to a tilting block (13), the tilting block (13) is fixedly connected to a connecting column (18), and the connecting column (18) is fixedly connected to a positioning frame (9); The screw rod (16) and the second rotating shaft (29) are both fixedly connected with a pulley (17), and the two pulleys (17) are connected via a connecting belt (15).

9. The outer film coating process of the building intermediate plate according to claim 8 is characterized in that: The fixing box (14) is provided with a groove, a telescopic rod (44) is fixedly connected inside the groove, a cleaning brush (42) is fixedly connected to the top of the telescopic rod (44), a second spring (45) is sleeved on the telescopic rod (44), and two ends of the second spring (45) are respectively connected to the cleaning brush (42) and the fixing box (14).

10. The outer film coating process of the building intermediate plate according to claim 4 is characterized in that: An auxiliary roller (46) is rotatably mounted inside the mounting frame (12).

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