Liquid material supply device for gypsum boards, gypsum board manufacturing device, method for manufacturing gypsum boards

Abstract

A liquid material supply device for gypsum board, said device supplying a liquid material to the cladding of a gypsum board and comprising: a tank for storing the liquid material; a liquid material supply tube that is connected to the tank and supplies the liquid material; a displacement device that displaces the position of the liquid material supply tube; an end section detection device that detects the position of an end section of the cladding in the width direction; and a control device that causes the position of the liquid material supply tube to be displaced by the displacement device so as to match the position of the end section of the cladding in the width direction detected by the end section detection device.

Description

Technical Field

[0001] The present invention relates to a liquid material supply device for gypsum boards, a gypsum board manufacturing device, and a method for manufacturing gypsum boards.

Background Art

[0002] Patent Document 1 discloses that a gypsum board has a configuration in which a gypsum core board is disposed between a lower surface sheet and an upper surface sheet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a gypsum board, a gypsum board in which a base paper for boards, a coating material such as a glass fiber mat, etc. is disposed on the surface of a gypsum hardened body is known. A gypsum board having such a coating material is manufactured by supplying a gypsum slurry between two coating materials and performing molding or the like.

[0005] In the process of manufacturing a gypsum board having a coating material, glue is applied to the end portions in the width direction where the two coating materials overlap, and the two are adhered to each other. The two adhered coating materials support the gypsum slurry in order to maintain the shape near the end of the gypsum board until the gypsum slurry is sufficiently hardened after the supplied gypsum slurry is molded.

[0006] In addition, a liquid material such as a lubricant is applied to the end portions of the coating material in addition to the above glue.

[0007] By the way, in a roll that winds up the coating material and supplies the coating material, the width of the coating material may slightly change at the start of supply and near the end of supply near the winding bar of the roll.

[0008] Therefore, even when the coating material is supplied from the same roll, the position of the widthwise end of the coating material may change along the material's transport path. On the other hand, as mentioned above, adhesive is required to be applied to the edges of the coating material or its vicinity. Furthermore, other liquid materials such as lubricants are required to be applied to areas at a predetermined distance from the edges. For this reason, when the position of the widthwise end of the coating material changes as described above, conventionally, the operator would visually check the position of the widthwise end of the coating material and manually change and adjust the position where the liquid material was supplied and applied.

[0009] However, depending on the operator's skill level, it was sometimes impossible to apply the liquid material to the edges of the coating material in the width direction, or to the appropriate location at a predetermined distance from the edges.

[0010] Therefore, when applying adhesive as a liquid material, for example, problems such as a decrease in adhesive strength between the two coating materials may occur. If the adhesive strength between the two coating materials is insufficient, the coating material will not adequately support the gypsum slurry after it has been molded and until it has hardened, resulting in defective products such as the shape of the edges of the resulting gypsum board not conforming to specifications. Similarly, if other liquid materials cannot be applied to the designated location, it will also result in defective products.

[0011] In view of the problems of the conventional technology described above, one aspect of the present invention aims to provide a liquid material supply device for gypsum boards that can detect the position of the end of the covering material in the width direction and supply the liquid material. [Means for solving the problem]

[0012] To solve the above problems, according to one embodiment of the present invention, a liquid material supply device for gypsum boards that supplies a liquid material to a coating material for a gypsum board, A tank for storing the aforementioned liquid material, A liquid material supply pipe connected to the tank and supplying the liquid material, A displacement device for displacing the position of the liquid material supply pipe, An end detection device for detecting the position of the end of the covering material in the width direction, The present invention provides a liquid material supply device for gypsum boards, comprising: a control device that displaces the position of the liquid material supply pipe using a displacement device in accordance with the position of the end of the covering material in the width direction detected by the end detection device; and a control device that displaces the position of the liquid material supply pipe using the displacement device. [Effects of the Invention]

[0013] According to one embodiment of the present invention, a liquid material supply device for gypsum boards can be provided that can detect the position of the edges in the width direction of the covering material and supply the liquid material. [Brief explanation of the drawing]

[0014] [Figure 1A] Figure 1A is a cross-sectional view of the gypsum board near the edge in the width direction. [Figure 1B] Figure 1B is a cross-sectional view of the gypsum board near the edge in the width direction. [Figure 1C] Figure 1C is a cross-sectional view of the gypsum board near the edge in the width direction. [Figure 2] Figure 2 is an explanatory diagram of a liquid material supply device for gypsum boards according to an embodiment of the present invention. [Figure 3] Figure 3 is a side view of the area around the discharge port of a liquid material supply device for gypsum boards. [Figure 4] Figure 4 is a top view showing an enlarged view of the area around the end detection device. [Figure 5A] Figure 5A is an explanatory diagram of the light emission position from an end detection device when the end detection device is equipped with a laser sensor. [Figure 5B] Figure 5B is an explanatory diagram of the light emission position from an end detection device when the end detection device is equipped with a laser sensor. [Figure 5C] Figure 5C is an explanatory diagram of the light emission position from an end detection device when the end detection device is equipped with a laser sensor. [Figure 6] Figure 6 is an explanatory diagram of a gypsum board manufacturing apparatus according to an embodiment of the present invention. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments for implementing the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and substitutions can be made to the following embodiments without departing from the scope of the present invention. [Liquid Material Feeding Device for Gypsum Board] (1) Regarding the Adhesive Part of the Coating Material for Gypsum Board Before describing the liquid material feeding device for gypsum board according to the present embodiment, the adhesive part of the coating material will be described with reference to FIGS. 1A to 1C.

[0016] FIGS. 1A to 1C are diagrams schematically showing a cross-section near an end in the width direction of a gypsum board, which is a kind of gypsum board.

[0017] The gypsum board 11 shown in FIG. 1A has a gypsum core 110 made of a hardened body of gypsum slurry, a base paper 111 for the first board, and a base paper 112 for the second board. The gypsum board 11 has a form in which the gypsum core 110 is covered with the base paper 111 for the first board, which is a coating material, and the base paper 112 for the second board.

[0018] The gypsum board 11 has an end 11A with a square edge, and the edge angle α is set to be approximately a right angle. The base paper 111 for the first board is bent at the corners 111A and 111B to form the end 11A of the gypsum board 11. Paste is applied or adhered to the coating area on the surface of the base paper 112 for the second board facing the base paper 111 for the first board, and it is overlapped on the upper surface of the end of the base paper 111 for the first board to form an adhesive part 113.

[0019] Regarding the gypsum board 12 shown in FIG. 1B, it also has a gypsum core 120 made of a hardened body of gypsum slurry, a base paper 121 for the first board, and a base paper 122 for the second board. The gypsum board 12 has a form in which the gypsum core 120 is covered with the base paper 121 for the first board, which is a coating material, and the base paper 122 for the second board.

[0020] The gypsum board 12 has a beveled edge at its end 12A. The first base paper for the board 121 is folded at corners 121A, 121B, and 121C to form the end 12A of the gypsum board 12. Adhesive is applied or coated to the coating area of ​​the second base paper for the board 122 on the side facing the first base paper for the board 121, and it is overlapped on the upper surface of the end of the first base paper for the board 121 to form an adhesive portion 123.

[0021] The gypsum board 13 shown in Figure 1C also has a gypsum core 130 made of a hardened gypsum slurry, a base paper 131 for the first board, and a base paper 132 for the second board. The gypsum board 13 has a form in which the gypsum core 130 is covered with the base paper 131 for the first board and the base paper 132 for the second board, which are covering materials.

[0022] The gypsum board 13 has a tapered edge at its end 13A. The first board base paper 131 is folded at corners 131A, 131B, and 131C to form the end 13A of the gypsum board 13. Adhesive is applied or coated to the coating area of ​​the second board base paper 132 on the side facing the first board base paper 131, and it is overlapped on the upper surface of the end of the first board base paper 131 to form an adhesive portion 133.

[0023] The liquid material supply device for gypsum boards in this embodiment is a device that supplies adhesive to the application area on the opposing surfaces of two covering materials in order to form an adhesive joint between covering materials, such as the adhesive joint between the first board base paper and the second board base paper, which are covering materials, when the liquid material is adhesive.

[0024] However, the liquid material supplied by the liquid material supply device for gypsum boards in this embodiment is not limited to adhesives, but includes various liquid additives supplied to the coating material, and the liquid material may be one or more selected from adhesives, lubricants, etc.

[0025] The liquid material supply device for gypsum boards according to this embodiment can be used, for example, by being installed in a line for manufacturing gypsum boards, such as in a gypsum board manufacturing apparatus described later.

[0026] The type of gypsum board manufactured using the liquid material supply device for gypsum boards of this embodiment is not particularly limited, and various types of gypsum boards can be mentioned, including those in which a coating material is placed on the surface of a hardened gypsum body obtained by hardening a gypsum slurry. Examples of gypsum boards include gypsum boards in which the surface of the gypsum board is covered with base paper for boards, and glass mat gypsum boards in which the surface of the gypsum board is covered with a glass fiber mat (sheet).

[0027] Examples of coating materials supplied with liquid material by the liquid material supply device for gypsum boards in this embodiment include base paper for boards and glass fiber mats. (2) Regarding the liquid material supply device for gypsum boards An example configuration of the liquid material supply device for gypsum boards according to this embodiment will be described with reference to the drawings.

[0028] The liquid material supply device for gypsum boards of this embodiment (hereinafter also referred to as the "supply device") is a liquid material supply device for gypsum boards that supplies liquid material to the coating material of a gypsum board, and comprises a tank, a liquid material supply pipe, a displacement device, an end detection device, and a control device, which are described below.

[0029] Figure 2 shows a top view of the supply device 20 of this embodiment. Figure 2 schematically shows the supply device 20 of this embodiment when supplying liquid material to coating areas 100A and 100B near the widthwise ends 10A and 10B of the coating material 10 being transported along block arrow A.

[0030] Figure 3 is a side view of the area around the discharge port 22A of the supply device 20 of this embodiment, as seen along arrow B in Figure 2.

[0031] Figure 4 is a top view showing an enlarged view of the area around the end detection device 25.

[0032] Figures 5A to 5C are explanatory diagrams illustrating the light emission position from an end detection device when the end detection device is equipped with a laser sensor.

[0033] In Figures 2 to 4, the X-axis represents the conveying direction of the covering material, the Y-axis represents the width direction of the covering material, and the Z-axis represents the height direction. The above drawings are schematic diagrams to explain the configuration of the supply device of this embodiment and do not accurately represent the sizes, etc.

[0034] As shown in Figure 2, when manufacturing gypsum boards, it is common practice to apply an adhesive, a type of liquid material, to both ends of the covering material 10 in the width direction. For example, let's consider the case of manufacturing a gypsum board 11 having a square edge, in which a gypsum core 110 made of a hardened gypsum slurry as shown in Figure 1A above is covered with a first board base paper 111 and a second board base paper 112. In this case, the first board base paper 111 is folded to form the end portion 11A of the gypsum board 11. Then, adhesive is applied or coated to the surface of the second board base paper 112 facing the first board base paper 111, and it is overlapped with the upper end surface of the first board base paper 111 to form an adhesive portion 113. For this reason, the supply device 20 of this embodiment shown in Figure 2 has two discharge ports 22A and 22B for supplying adhesive, corresponding to the number of application areas 100A and 100B, which are areas where the liquid material adhesive is applied. However, the invention is not limited to this configuration, and the supply device of this embodiment may, for example, have one discharge port. Furthermore, multiple supply devices can be used depending on the number of coating areas to be coated with the liquid material.

[0035] The components of the supply device of this embodiment will be described below with reference to Figures 2, 3, 4, and 5A to 5C. (2-1) Tank Tank 31 can store liquid material to be supplied to the coating material 10.

[0036] Tank 31 is connected to liquid material supply pipes, such as the first liquid material supply pipes 21A and 21B and the second liquid material supply pipe 34, which will be described later, and is a tank for storing the liquid material to be supplied to the coating material 10. Tank 31 only needs to be able to store liquid material, and its shape and other characteristics are not particularly limited. The number of tanks 31 in the supply device 20 is also not particularly limited; for example, there may be one or multiple tanks.

[0037] Even if the supply device 20 of this embodiment has multiple discharge ports 22A, 22B and pumps 30A, 30B, the number of tanks 31 may be limited to one, as shown in Figure 2, for example, and the liquid material supply pipe that supplies liquid material from the tank 31 to the discharge ports 22A, 22B may be branched. Furthermore, the supply device 20 of this embodiment may also have multiple tanks 31, for example two, to match the number of discharge ports 22A, 22B and pumps 30A, 30B.

[0038] Tank 31 may function as a temporary buffer tank, i.e., an auxiliary tank. If Tank 31 is a buffer tank, one or more main tanks 32 can be provided upstream of Tank 31 in the liquid material supply path, and the main tanks 32 and Tank 31 can be connected by a third liquid material supply pipe 33. A pump can also be provided along the liquid material supply path of the third liquid material supply pipe 33 to transport the liquid material from the main tank 32 to Tank 31, if necessary. The type of pump is not particularly limited as long as it can transport the liquid material to Tank 31. Furthermore, if multiple main tanks 32 are provided, a valve can be provided between the main tanks 32 and Tank 31 to switch which main tank 32 is connected to Tank 31.

[0039] The main tank 32 can be omitted, and the only tank for storing liquid materials can be tank 31. (2-2) Liquid material supply pipe, discharge port The liquid material supply pipe is a pipe that connects to the tank 31 and supplies liquid material.

[0040] Discharge ports 22A and 22B are provided at the end of the liquid material supply pipe, and the pipe is configured to discharge the liquid material onto the coating material 10 from the end of the liquid material supply pipe. (Discharge port) The discharge ports 22A and 22B, which are the ends of the liquid material supply pipe, are preferably installed so as to supply the liquid material to the vicinity of the widthwise ends of the coating material 10, specifically to the coating areas 100A and 100B. The positions of the coating areas 100A and 100B are not limited to the configuration shown in Figure 2, as will be described later, and can be selected according to the type of liquid material, the manufacturing conditions of the gypsum board, etc. The number of discharge ports 22A and 22B in the supply device 20 of this embodiment is not particularly limited and may be one or multiple.

[0041] For example, as shown in Figure 2, the supply device 20 of this embodiment may have two discharge ports 22A and 22B to match the number of coating areas 100A and 100B to which the liquid material is applied.

[0042] As shown in Figure 2, if the supply device 20 of this embodiment has two discharge ports 22A and 22B, the discharge ports 22A and 22B can be arranged to supply liquid material to coating areas 100A and 100B located near the ends 10A and 10B of the coating material 10, for example. That is, liquid material supply pipes can be placed at both ends 10A and 10B in the width direction of the coating material 10. Specifically, first liquid material supply pipes 21A and 21B, and their end ports 22A and 22B can be placed at both ends 10A and 10B in the width direction of the coating material 10. In this way, by placing the first liquid material supply pipes 21A and 21B and their end ports 22A and 22B at both ends in the width direction of the coating material 10, the liquid material can be applied to both ends in the width direction of the coating material 10 simultaneously.

[0043] The width, position, and number of the coating areas 100A and 100B are selected according to the manufacturing conditions of the gypsum board, such as the type of liquid material, and are not particularly limited. If the liquid material is an adhesive, it is usually required to apply the adhesive to the bonding area between the coating materials 10. Therefore, as shown in Figure 2, for example, the coating areas 100A and 100B may be placed on the back side of the coating material 10, including the ends 10A and 10B, respectively. Also, if the liquid material is an adhesive, the width of the coating areas 100A and 100B can be selected according to the width of the overlap with other coating materials to be bonded.

[0044] As described above, the width, position, and number of coating areas 100A and 100B are selected based on the type of liquid material, the manufacturing conditions of the gypsum board, etc., and the position of coating areas 100A and 100B are not limited to the examples given above. For example, the coating areas may be placed on the front side of the coating material 10 instead of the back side, or in addition to the back side.

[0045] The discharge ports 22A and 22B can be installed to supply liquid material 35 to the coating area of ​​the coating material 10, for example, as shown in Figure 3. The discharge ports 22A and 22B may be positioned facing the coating material 10, or they may be positioned so that the direction of discharge of the liquid material from discharge port 22A is aligned with the transport direction of the coating material 10, as shown in Figure 3. The shape of the discharge ports 22A and 22B is not particularly limited and may be circular, or they may be elliptical, polygonal, or other shapes depending on the shape of the coating area.

[0046] The discharge ports 22A and 22B may be provided at the ends of the first liquid material supply pipes 21A and 21B, which are liquid material supply pipes that supply liquid material connected to pumps 30A and 30B, on the side opposite to the side connected to pumps 30A and 30B, and may be formed by these ends. (Liquid material supply pipe) The supply device 20 of this embodiment may have first liquid material supply pipes 21A, 21B and a second liquid material supply pipe 34, which are connected to the tank 31 and supply liquid material.

[0047] Pumps 30A and 30B, described later, can be placed between the first liquid material supply pipes 21A and 21B and the second liquid material supply pipe 34.

[0048] The supply device 20 of this embodiment may have liquid material supply pipes between each component in order to constitute a transport path for liquid material within the device. In this specification, for convenience, in order to clarify which liquid material supply pipe is being referred to, the liquid material supply pipes may be described separately, such as the first liquid material supply pipe 21A, 21B, the second liquid material supply pipe 34, and the third liquid material supply pipe 33, as described above.

[0049] The materials of the first liquid material supply pipes 21A, 21B and the second liquid material supply pipe 34 are not particularly limited, but it is preferable that at least the inner circumferential surface of the first liquid material supply pipes 21A, 21B and the second liquid material supply pipe 34 be made of silicone resin. Furthermore, it is more preferable that the first liquid material supply pipes 21A, 21B and the second liquid material supply pipe 34 be made of silicone resin hoses.

[0050] When the supply device 20 is used for a long period of time, the liquid material may solidify and form clumps, creating residue. If such residue forms inside the liquid material supply pipe, it may obstruct the supply of liquid material, or the clumps may be discharged onto the coating material 10, causing defective products. In response to this, by making the inner surfaces of the first liquid material supply pipes 21A, 21B and the second liquid material supply pipe 34 out of silicone resin, even if the liquid material partially solidifies, it can be discharged before it grows into large clumps. This prevents obstruction of the supply of liquid material and prevents clumps from being discharged onto the coating material 10.

[0051] Furthermore, for the same reasons, it is preferable that at least the inner surface of other liquid material supply pipes that come into contact with the liquid material and connect components such as the third liquid material supply pipe 33 described later be made of silicone resin, and more preferably be a silicone resin hose. (2-3) End detection device The end detection device 25 can detect the position of the end 10A in the width direction of the covering material 10.

[0052] As previously described, in the roll from which the coating material is wound and supplied, the width of the coating material may change slightly between the start of supply and near the end of supply near the winding rod of the roll. Therefore, even when supplying the coating material from the same roll, the position of the widthwise end of the coating material may change along the conveyance path of the coating material. The liquid material is then applied to the coating area at a predetermined distance from the end of the coating material, depending on the manufacturing conditions of the gypsum board, such as at or near the end of the coating material. Therefore, when the position of the widthwise end of the coating material changes, conventionally, the operator had to visually check the position of the widthwise end of the coating material and manually change and adjust the position where the liquid material was supplied and applied.

[0053] However, depending on the operator's skill level, there were problems such as being unable to apply the liquid material to the appropriate position at the edges in the width direction of the coating material.

[0054] Therefore, the supply device 20 of this embodiment can have an end detection device 25 that can detect the position of the end 10A in the width direction of the covering material 10.

[0055] The end detection device 25 allows for the detection of the position of the end 10A in the width direction of the coating material 10, and enables the displacement of the first liquid material supply pipe 21A and the discharge port 22A based on the detected data. This makes it possible to supply and apply the liquid material from the discharge port 22A to the appropriate position on the coating material 10.

[0056] The configuration of the end detection device 25 is not particularly limited. For example, it may be configured with an imaging device and an image analysis device, and the position of the end 10A may be detected by analyzing an image of the conveyed covering material 10. Alternatively, the end detection device 25 may be configured to detect the position of the end 10A in the width direction of the covering material 10 using various sensors.

[0057] In particular, the end detection device 25 is preferably equipped with a laser sensor because it requires little detection time, is relatively inexpensive to obtain, and has excellent detection accuracy.

[0058] A laser sensor is a sensor that uses a laser as its light-emitting element. A laser sensor projects laser light onto an object to be detected, and after the light passes through or reflects off the object, it can detect the presence or state of the object at the projection location by utilizing changes in the amount of light incident on the light receiver.

[0059] The end detection device 25 may include, for example, a first laser sensor 252A and a second laser sensor 252B arranged along the width direction (Y-axis) of the covering material, as shown in Figure 4.

[0060] As shown in Figure 4, the first laser sensor 252A and the second laser sensor 252B are positioned along the width direction of the covering material 10, separated by a distance L, as will be described later. In Figure 4, the first laser sensor 252A is positioned closer to the center in the width direction of the covering material 10 than the second laser sensor 252B.

[0061] When the laser sensor is positioned along the width direction of the covering material 10 as described above, the end of the covering material in the width direction can be detected as follows.

[0062] As shown in Figure 5A, suppose the first laser sensor 252A detects that the covering material 10 is located at the light emission position 51, and the second laser sensor 252B detects that the covering material 10 is not located at the light emission position 52. In this case, the end portion 10A of the covering material 10 is located between the light emission positions 51 and 52, and the position of the end portion 10A can be detected.

[0063] As shown in Figure 5B, suppose that the first laser sensor 252A detects that the covering material 10 is not present at both the emission position 51 and the second laser sensor 252B detect it at the emission position 52. In this case, the end portion 10A of the covering material 10 is located closer to the center of the covering material 10 in the width direction than the emission positions 51 and 52.

[0064] As shown in Figure 5C, assume that the presence of the covering material 10 is detected at both the emission position 51 of the first laser sensor 252A and the emission position 52 of the second laser sensor 252B. In this case, the end portion 10A of the covering material 10 is located further away from the center of the covering material 10 in the width direction than the emission positions 51 and 52.

[0065] Therefore, when the covering material 10 is located at the light emission position 51 of the first laser sensor 252A, and the covering material 10 is not located at the light emission position 52 of the second laser sensor 252B, it is possible to detect that the end portion 10A of the covering material 10 is located between the light emission positions 51 and 52. Specifically, in the above case, it is possible to detect that the end portion 10A of the covering material 10 is located between the light emission position 51 of the first laser sensor 252A and the light emission position 52 of the second laser sensor 252B.

[0066] If the positional relationship between the end 10A of the covering material 10 and the light projection positions 51 and 52 is as shown in Figures 5B and 5C, the position of the end detection device 25 can be changed by a displacement device or the like (described later), and the detection operation can be repeated until the relationship between the end of the covering material and the light projection position is as shown in Figure 5A. When the positional relationship between the light projection positions 51 and 52 is as shown in Figure 5A, the position of the end 10A of the covering material 10 can be accurately detected.

[0067] The first laser sensor 252A and the second laser sensor 252B can be positioned apart along the width direction of the covering material 10, as described above. The distance L between the first laser sensor 252A and the second laser sensor 252B along the width direction of the covering material 10 is not particularly limited. The distance L is preferably, for example, 0.1 mm or more and 5 mm or less, more preferably 0.1 mm or more and 1 mm or less, and even more preferably 0.1 mm or more and 0.5 mm or less. By setting the distance L to 5 mm or less, the distance between the light emission positions 51 and 52 from the first laser sensor 252A and the second laser sensor 252B can be shortened. This improves the detection accuracy of the end portion 10A of the covering material 10.

[0068] Furthermore, by setting the distance L to 0.1 mm or more, interference between the laser beam from the first laser sensor 252A and the laser beam from the second laser sensor 252B can be prevented. This also suppresses the decrease in measurement accuracy caused by the above interference.

[0069] The first laser sensor 252A and the second laser sensor 252B can be fixed to the fixing base material 251 via L-shaped brackets 253A and 253B using bolts or the like (not shown), as shown in Figure 4, for example. The distance L can be adjusted, for example, by placing a shim plate 254, which is a spacer, between the fixing base material 251 and the second laser sensor 252B when fixing the second laser sensor 252B to the fixing base material 251 via the L-shaped bracket 253B. Specifically, by making the thickness of the shim plate 254 the same as the desired distance L, the distance L between the first laser sensor 252A and the second laser sensor 252B in the width direction of the covering material 10 can be set to L.

[0070] In Figure 4, the first laser sensor 252A and the second laser sensor 252B are positioned apart along the transport direction (X-axis) of the coating material due to the configuration of the device.

[0071] The end detection device 25 can be installed at locations where it is required to detect the end of the covering material 10 in the width direction, and the number of end detection devices 25 in the supply device 20 is not particularly limited.

[0072] For example, if the supply device 20 has two discharge ports 22A and 22B, two end detection devices 25 can be arranged according to the number of discharge ports. Also, for example, if, of the ends 10A and 10B in the width direction of the covering material 10, the supply position of one end 10B is controlled to be constant and there is no need to detect its position, then, as shown in Figure 2, the end detection device 25 can be arranged only on the side of one discharge port 22A. In other words, the end detection device 25 can also detect the position of one end 10A in the width direction of the covering material 10. In this case, the displacement device described later will displace the position of the first liquid material supply pipe 21A, which is located at one end 10A in the width direction of the covering material 10, and the discharge port 22A, which is its end.

[0073] By configuring the end detection device 25 to detect only the position of one end 10A in the width direction of the coating material 10, control during the supply of liquid material can be simplified, thereby reducing the cost of the supply device 20. (2-4) Displacement device The displacement device can displace the positions of the first liquid material supply pipes 21A and 21B, and their end ports 22A and 22B, along the width direction of the covering material 10.

[0074] As described above, when the end detection device 25 detects the position of the end 10A in the width direction of the covering material 10, the position of the end detection device 25 can be moved along the width direction of the covering material 10. For this reason, it is preferable that the displacement device also moves the end detection device 25 together with the first liquid material supply pipes 21A and 21B and their ends, the discharge ports 22A and 22B.

[0075] The configuration of the displacement device is not particularly limited; it is sufficient that the positions of the first liquid material supply pipes 21A and 21B can be displaced along the width direction of the covering material 10.

[0076] The displacement device may have a linear motion mechanism 24 and drive devices 23A and 23B, as shown in Figure 2, for example. The linear motion mechanism 24 may be a linear rail (linear guide) or a linear shaft. The drive devices 23A and 23B may be a linear bush, a linear motor, or a motor. (2-5) Control device The control device 26A can use a displacement device to displace the position of the first liquid material supply pipe 21A and its end, the discharge port 22A, in accordance with the position of the end 10A in the width direction of the covering material 10 detected by the end detection device 25.

[0077] As described above, when the covering material 10 is located at the light emission position of the first laser sensor 252A of the end detection device 25, and the covering material 10 is not located at the light emission position of the second laser sensor 252B, then the end 10A of the covering material 10 is located between the two light emission positions. Therefore, the position of the end 10A in the width direction of the covering material 10 can be detected.

[0078] In the above case, the control device 26A can use a displacement device to displace the position of the first liquid material supply pipe 21A and its end, the discharge port 22A, in accordance with the position of the detected end 10A in the width direction of the covering material 10.

[0079] The control device 26A can also use a displacement device to displace the position of the end detection device 25 in order for the end detection device 25 to detect the position of the end 10A in the width direction of the covering material 10.

[0080] As will be described later, the supply device 20 of this embodiment may also have first liquid material supply pipes 21A, 21B, discharge ports 22A, 22B which are their ends, and support bodies 27A, 27B to which the end detection device 25 is fixed. In this case, as described above, when the end detection device 25 displaces the position of the end detection device 25 by the displacement device in order to detect the end 10A in the width direction of the covering material 10, the positions of the first liquid material supply pipe 21A and the discharge port 22A will also be displaced via the support bodies 27A.

[0081] In the supply device 20 shown in Figure 2, an example is shown in which the end detection device 25 is provided only on one end 10A of the covering material 10. Therefore, only the control device 26A has been described above, but the configuration is not limited to this. An end detection device 25 can also be provided on the other end 10B of the covering material 10, and the control device 26B can control it in the same way as the control device 26A.

[0082] The control devices 26A and 26B may include a CPU, which is an arithmetic processing unit for performing calculations necessary for control, RAM or ROM as main memory, auxiliary storage, an input / output interface, and a display device as an output device. The CPU, main memory, auxiliary storage, input / output interface, and output device of the control devices 26A and 26B can be interconnected by a bus. All of the above components of the control devices 26A and 26B do not need to be housed in the same enclosure; for example, the auxiliary storage and display device may be provided externally. The auxiliary storage device may be an SSD or HDD.

[0083] CPU stands for Central Processing Unit, RAM stands for Random Access Memory, and ROM stands for Read Only Memory. SSD stands for Solid State Drive, and HDD stands for Hard Disk Drive.

[0084] Examples of input / output interfaces include wired or wireless interfaces for exchanging detection data from the end detection device 25 and control amounts from the displacement device. The control devices 26A and 26B may also be configured to exchange data with the tank 31 and pumps 30A and 30B as needed. Furthermore, the control devices 26A and 26B may be configured to acquire data such as the remaining amount and temperature of the liquid material in the tank 31, and the operating status of the pumps 30A and 30B. In this case, the control devices 26A and 26B may utilize data from the tank 31 and pumps 30A and 30B when determining control conditions.

[0085] Furthermore, input / output interfaces include user interfaces such as touch panels, keyboards, and operation buttons for selecting control conditions.

[0086] The control devices 26A and 26B can be configured using a personal computer (PC) or the like. Therefore, the above-mentioned parts of the control devices 26A and 26B may be realized through the collaborative action of software and hardware, where the CPU of the personal computer or other information processing device executes a program that has been pre-stored.

[0087] Figure 2 shows an example in which control devices 26A and 26B are placed on the equipment located at end 10A and end 10B of the covering material 10, but the configuration is not limited to this. For example, the supply device 20 may have only one control device, and this control device may be configured to control each of the devices.

[0088] The control devices 26A and 26B can also perform controls other than those described above. For example, they can control the operation of the pumps 30A and 30B. Specifically, the control devices 26A and 26B can control the supply rate of liquid material from the tank 31 to the discharge ports 22A and 22B by the pumps 30A and 30B, as well as the stopping and starting of the supply of liquid material. The supply rate of liquid material refers to the amount of liquid material supplied per unit time.

[0089] The control devices 26A and 26B can control the supply speed of the liquid material according to, for example, the transport speed of the coating material 10 that supplies the liquid material. The transport speed of the coating material 10 is selected according to the manufacturing conditions of the gypsum board using the coating material, and can be said to constitute the manufacturing conditions of the gypsum board. Therefore, the control devices 26A and 26B can control the supply speed of the liquid material from the tank 31 to the discharge ports 22A and 22B by the pumps 30A and 30B according to the manufacturing conditions of the gypsum board manufactured by, for example, a gypsum board manufacturing apparatus to which the supply device 20 is attached.

[0090] By controlling the supply speed of liquid material from tank 31 to discharge ports 22A and 22B by pumps 30A and 30B using control devices 26A and 26B, according to the manufacturing conditions of the gypsum board being produced, the liquid material can be supplied onto the coating material under optimal conditions according to the manufacturing conditions of the gypsum board being produced. (2-7) Pump Pumps 30A and 30B can be placed on the liquid material supply path between the tank 31 and the discharge ports 22A and 22B. To precisely control the discharge of liquid material from each discharge port 22A and 22B, it is preferable to provide pumps 30A and 30B for each discharge port 22A and 22B. As shown in Figure 2, when there are two pumps 30A and 30B and two discharge ports 22A and 22B, it is preferable to place the two pumps 30A and 30B in parallel on the liquid material supply path between the tank 31 and each discharge port 22A and 22B.

[0091] In the case of the supply device 20 shown in Figure 2, the liquid material supply path between the tank 31 and the respective discharge ports 22A and 22B consists of a second liquid material supply pipe 34 and first liquid material supply pipes 21A and 21B.

[0092] The type of pump used in pumps 30A and 30B is not particularly limited, but for example, a positive displacement pump can be used.

[0093] A positive displacement pump is a pump that changes the volume of a liquid substance, such as glue, in a fixed spatial volume through reciprocating or rotational motion, thereby imparting energy to the liquid substance and transporting it.

[0094] Positive displacement pumps can supply liquid materials such as glue in fixed amounts at a constant speed. Positive displacement pumps can be broadly classified into rotary positive displacement pumps and reciprocating positive displacement pumps, and the supply amount can be easily and precisely controlled by controlling the conditions of rotational or reciprocating motion.

[0095] Therefore, by using positive displacement pumps as pumps 30A and 30B, a stable and appropriate amount of liquid material can be supplied to the coating material. As a result, if the liquid material is adhesive, stable adhesion between the coating materials can be achieved, and the edge shape of the gypsum board can be made into the desired shape. In addition, the occurrence of defective products due to the edge shape of the gypsum board not meeting specifications can be suppressed during the manufacturing of the gypsum board. Furthermore, if the liquid material is adhesive, the adhesion of solidified adhesive from the coating material 10 to the molding machine can be suppressed, and the occurrence of indentations on the surface of the gypsum board due to such solidified adhesive can be suppressed.

[0096] Positive displacement pumps can be broadly classified into rotary positive displacement pumps (rotary pumps) and reciprocating positive displacement pumps (reciprocating pumps). Rotary positive displacement pumps are a type of positive displacement pump that sucks in and discharges liquids by the rotational motion of rotating parts, and examples include gear pumps, vane pumps, and screw pumps. Reciprocating positive displacement pumps are a type of positive displacement pump that sucks in and discharges liquids by the reciprocating motion of parts, and examples include piston pumps, plunger pumps, and diaphragm pumps. The positive displacement pumps used in pumps 30A and 30B of the supply device 20 in this embodiment may be either rotary positive displacement pumps or reciprocating positive displacement pumps.

[0097] Furthermore, it is more preferable that the positive displacement pumps used in pumps 30A and 30B be screw pumps. A screw pump is a type of pump that uses a screw-shaped rotor to transport objects, and is also called a screw pump.

[0098] In a screw pump, a screw-shaped rotor rotates within the stator, creating a series of independent, sealed spaces called cavities in the gap between the rotor and the stator. As the rotor rotates within the stator, it generates a strong suction force, causing the cavities to move toward the discharge side and transport the liquid material.

[0099] This screw pump enables pulsation-free, quantitative transport, allowing for particularly precise control of the supply amount of liquid material, and can therefore be more preferably used as a positive displacement pump as described above.

[0100] Furthermore, among screw pumps, single-screw pumps are particularly preferred. As an example of a single-screw pump, a single-screw eccentric pump (also known as a Mono pump® or Moano pump) is known and preferred.

[0101] Pump 30A and pump 30B may be different types of pumps. However, since it is preferable to supply the liquid material to each coating area 100A and 100B of the coating material 10 at the same supply rate, it is preferable that pump 30A and pump 30B are of the same type.

[0102] Pumps 30A and 30B can be connected to the tank 31 by a second liquid material supply pipe 34. In Figure 2, the second liquid material supply pipe 34 is shown branching midway, but it is also possible to provide a second liquid material supply pipe 34 to each of pumps 30A and 30B and configure them to be directly connected to the tank 31. (2-8) Support The supply device 20 of this embodiment may also have supports 27A and 27B.

[0103] The first liquid material supply pipes 21A and 21B and the end detection device 25 are fixed to the supports 27A and 27B.

[0104] The shape of the supports 27A and 27B is not particularly limited. Preferably, the supports 27A and 27B are configured to fix the first liquid material supply pipes 21A and 21B, their end ports 22A and 22B, and the end detection device 25. Furthermore, preferably, the supports 27A and 27B are configured to allow displacement of the first liquid material supply pipes 21A and 21B, their end ports 22A and 22B, and the end detection device 25 along with the displacement of the supports 27A and 27B.

[0105] As shown in Figures 2 and 3, it is preferable that the supports 27A and 27B be connected to the displacement device. In this case, the displacement device can displace the positions of the supports 27A and 27B along the width direction of the covering material 10, thereby simultaneously displacing the positions of the first liquid material supply pipes 21A and 21B, their ends, which are the discharge ports 22A and 22B, and the end detection device 25.

[0106] Furthermore, it is preferable that the control device 26A displaces the position of the support 27A using a displacement device such that the covering material 10 is located at the light emission position of the first laser sensor 252A, and the covering material 10 is not located at the light emission position of the second laser sensor 252B.

[0107] In the above case, it is preferable to fix the end detection device 25, the first liquid material supply pipe 21A, and the discharge port 22A to the support 27A so that when the end detection device 25 is at a position corresponding to the end 10A in the width direction of the coating material 10, that is, at the position where the end 10A has been detected, the discharge port 22A can supply liquid material to the coating area 100A.

[0108] As previously described, the supply device 20 shown in Figure 2 is an example in which the end detection device 25 is provided only on one end 10A of the covering material 10, and therefore only the control device 26A has been explained above, but the configuration is not limited to this. An end detection device 25 can also be provided on the other end 10B of the covering material 10, and the control device 26B can control it in the same way as the control device 26A. (2-9) Spreading member The supply device 20 may further include spreading members 28A and 28B that spread the liquid material 35 supplied onto the coating material 10 from the discharge ports 22A and 22B.

[0109] As shown in Figure 3, the spreading members 28A and 28B can spread the liquid material 35 supplied from the discharge ports 22A and 22B onto the coating areas 100A and 100B of the coating material 10 over a predetermined range of the coating areas 100A and 100B while suppressing variations in thickness.

[0110] The spreading members 28A and 28B can be any member capable of spreading the liquid material 35, such as a spatula, roller, or brush, with a spatula being particularly preferred.

[0111] When spatulas are used as the spreading members 28A and 28B, any shape and number of notches can be made on the sides of the spreading members 28A and 28B facing the covering material 10 to adjust the application shape of the liquid material 35.

[0112] Furthermore, when installing the spreading members 28A and 28B, it is preferable to provide a support member, such as a roller 29, on the opposite side of the covering material 10 from the portion where the spreading members 28A and 28B are installed.

[0113] By providing the roller 29, the load of the extending members 28A, 28B and the covering material 10 can be supported. The extending members 28A and 28B are supported by the roller 29 via the covering material 10.

[0114] Therefore, by providing the roller 29, when the spreading members 28A and 28B press and spread the liquid material 35 onto the covering material 10, it is possible to prevent the force applied by the spreading members 28A and 28B from escaping. In addition, by providing the roller 29, it is possible to prevent the covering material 10 from being damaged when the spreading members 28A and 28B press and spread the liquid material 35 onto the covering material 10. [Gypsum board manufacturing equipment] Next, we will describe an example of the configuration of the gypsum board manufacturing apparatus of this embodiment.

[0115] The gypsum board manufacturing apparatus of this embodiment may include the supply device described above.

[0116] In addition to the supply device described above, the gypsum board manufacturing apparatus of this embodiment may have various means necessary for manufacturing gypsum boards.

[0117] Using Figure 6, an example of the configuration of the gypsum board manufacturing apparatus 60 of this embodiment will be explained. In addition to the supply device 20 described above, the gypsum board manufacturing apparatus 60 includes a mixer 62, which is a mixing means for mixing raw materials, and a molding machine 68 for molding the gypsum slurry prepared by the mixer 62. An example of the configuration of the apparatus will be described in detail below. In the following explanation, the case in which the gypsum board is a gypsum board will be used as an example. (1) Mixer The mixer 62 can be positioned in a predetermined location related to the conveying line for the covering material, such as the base paper 611 for the first board and the base paper 612 for the second board, for example, above or beside the conveying line. Then, in a single mixer 62, calcined gypsum, which is the raw material for the gypsum slurry, water, and optionally various additives can be mixed together to prepare the gypsum slurry.

[0118] Here, calcined gypsum is also called calcium sulfate 1 / 2 hydrate and is an inorganic composition that has hydraulic properties. As calcined gypsum, either β-type calcined gypsum or α-type calcined gypsum alone, or a mixture of both, can be used. β-type calcined gypsum is obtained by calcining gypsum, either alone or in combination with natural gypsum, by-product gypsum, flue gas desulfurization gypsum, and recycled gypsum such as waste gypsum boards, in the atmosphere. α-type calcined gypsum is obtained by calcining gypsum, either alone or in combination with natural gypsum, by-product gypsum, flue gas desulfurization gypsum, and recycled gypsum such as waste gypsum boards, in water (including steam).

[0119] When manufacturing gypsum boards, it is preferable that the calcined gypsum used as a raw material contains β-type calcined gypsum, and it is even more preferable that the main component of the calcined gypsum used as a raw material for gypsum boards is β-type calcined gypsum. Note that when the main component of the calcined gypsum used as a raw material for gypsum boards is β-type calcined gypsum, it means that β-type calcined gypsum accounts for more than 50% by mass of the calcined gypsum used as a raw material for gypsum boards. In the manufacture of gypsum boards, the calcined gypsum used as a raw material may consist solely of β-type calcined gypsum.

[0120] To produce α-type calcined gypsum, it is necessary to calcine dihydrate gypsum, such as natural gypsum, under pressure in water or steam using an autoclave. In contrast, β-type calcined gypsum can be produced by calcining dihydrate gypsum, such as natural gypsum, under atmospheric pressure in air, and β-type calcined gypsum can be produced more productively than α-type calcined gypsum.

[0121] Examples of additives include one or more selected from the following: adhesion improvers that enhance the adhesion between hardened gypsum (hardened gypsum slurry) such as starch and polyvinyl alcohol and the base paper for boards; inorganic fibers such as glass fibers; lightweight aggregates; refractory materials such as vermiculite; setting retarders; setting accelerators; water-reducing agents; foaming agents such as sodium alkyl sulfate, alkyl ether sulfate, sodium alkylbenzene sulfonate, and polyoxyethylene alkyl sulfate; foam size modifiers such as sulfosuccinate-type surfactants; water repellents such as silicone and paraffin; organic carboxylic acids; and organic carboxylates.

[0122] Alternatively, calcined gypsum and some additives, such as solid additives, can be pre-mixed and stirred to form a gypsum composition before being supplied to the mixer 62.

[0123] Furthermore, by adding foam at one or more selected locations among the gypsum slurry dispensing ports 621, 622, and 623, and adjusting the amount of foam added, it is possible to create a gypsum slurry of any desired density. For example, by not adding foam, or adding only a small amount of foam, from dispensing ports 621 and 622, a high-density first gypsum slurry 63 can be prepared. Then, by adding more foam than in the first gypsum slurry from dispensing port 623, a low-density second gypsum slurry 64 can be prepared.

[0124] The obtained first gypsum slurry 63 is then supplied through the delivery pipes 651 and 652 onto the first board base paper 611 and the second board base paper 612 upstream of the roller coater 66 in the transport direction of the board base paper.

[0125] The high-density first gypsum slurry 63 supplied onto the first board base paper 611 and the second board base paper 612 each reach the spreading section of the roller coater 66 and is spread there. The roller coater 66 may have a coating roller 661, a receiving roller 662, and a waste removal roller 663. The first gypsum slurry 63 can be spread onto the board base paper as each board base paper passes between the coating roller 661 and the receiving roller 662.

[0126] In this way, a thin layer of the first gypsum slurry 63 is formed on the first base paper 611 for the first board. Subsequently, the first base paper 611 for the first board is folded, and its side edges extend upward and then inward. A thin layer of the first gypsum slurry 63 is also formed on the second base paper 612 for the second board, but unlike the first base paper 611, the second base paper 612 for the second board is not folded. Note that the first gypsum slurry 63 is not limited to being applied to both the first base paper 611 and the second base paper 612 for the first board. For example, the first gypsum slurry 63 may be applied to only one of the first base paper 611 or the second base paper 612 for the first board. Alternatively, the first gypsum slurry 63 may be placed only on the side edges, which are the widthwise edges of the first base paper 611 for the first board.

[0127] The base paper 611 for the first board is transported as is, while the base paper 612 for the second board is turned in the direction of the transport line of the base paper 611 by the turning roller 67. (2) Feeding device Liquid material can be supplied and applied to the coating area of ​​the base paper 612 for the second board by the supply device 20 described above.

[0128] As the liquid material, one or more types selected from adhesives, lubricants, etc., as described above can be used. Liquid adhesives are preferably used as the adhesive, starch-based adhesives, natural rubber latex adhesives, and synthetic adhesives are more preferably used, and aqueous emulsion adhesives are even more preferably used. In this specification, liquid material and liquid adhesive mean that the material is liquid at the operating temperature, for example, room temperature (27°C).

[0129] The location where the supply device 20 is installed is not particularly limited and can be selected according to the type of liquid material, etc., but for example, it can be installed before supplying the gypsum slurry to the base paper 612 for the second board.

[0130] The arrangement of the supply device 20 is not limited to the configuration shown in Figure 6. For example, it may be configured to supply and coat the liquid material to the first board base paper 611 instead of, or in addition to, the second board base paper 612. The gypsum board manufacturing apparatus 60 may also have multiple supply devices 20 as needed.

[0131] The supply device 20 has already been described, so its explanation will be omitted here. If the supply device has spreading members 28A and 28B, it is preferable to install the aforementioned rollers 29, which support the load of the spreading members 28A and 28B and the base paper 612 for the second board, together, as shown in Figure 2. (3) Molding machine The first board base paper 611 and the second board base paper 612, being transported within the gypsum board manufacturing apparatus 60, reach the molding machine 68. Here, the second gypsum slurry 64 is supplied from the mixer 62 through the pipeline 653 between the thin layers of the first gypsum slurry 63 formed on the first board base paper 611 and the second board base paper 612. As a result, a continuous laminate can be formed between the first board base paper 611 and the second board base paper 612, consisting of layers formed by the first gypsum slurry 63, layers formed by the second gypsum slurry 64, and layers formed by the first gypsum slurry 63.

[0132] Furthermore, the method is not limited to using a high-density first gypsum slurry 63 and a low-density second gypsum slurry 64; for example, a gypsum slurry of one density may be manufactured and supplied onto a base paper for boards.

[0133] Specifically, for example, a gypsum slurry of a predetermined density is supplied and deposited on a first base paper 611 for the board, which is continuously conveyed. Then, each coated area, which is the widthwise edge of the first base paper 611 for the board, is folded along predetermined lines and extends upward and then inward, thereby partially wrapping up the deposited layer of gypsum slurry. After this, a second base paper 612 for the board, which is conveyed at the same speed, can be placed on top of the deposited layer of gypsum slurry that has been partially wrapped up by the first base paper 611 for the board. Next, it is formed by passing it through a molding machine 68 that determines the thickness and width of the gypsum board. A gypsum board can also be formed by the above procedure. In this case, a layer of gypsum slurry of a certain density is formed between the first base paper 611 for the board and the second base paper 612 for the board.

[0134] Thus, the molding machine 68 of the gypsum board manufacturing apparatus 60 can perform a molding process to shape the gypsum slurry, thereby enabling the production of a gypsum slurry molded body 69.

[0135] The gypsum board manufacturing apparatus of this embodiment may further include any optional components as needed. (4) Dryer, cutting device In this embodiment, the gypsum board manufacturing apparatus can also be equipped with a dryer, cutting device, etc., as needed, downstream of the molding machine 68.

[0136] A dryer can reduce excess moisture in the gypsum slurry molded product.

[0137] One or more cutting devices can be installed as needed. For example, a first cutting device (rough cutting device) can be installed to roughly cut the manufactured gypsum boards for placement in the drying oven. A second cutting device can also be installed to cut the boards to the size of the final product.

[0138] The type of gypsum board produced by the gypsum board manufacturing apparatus of this embodiment and the gypsum board manufacturing method described later is not particularly limited, and various types of gypsum boards can be mentioned, including those in which a coating material is placed on the surface of a hardened gypsum body obtained by hardening a gypsum slurry. Examples of gypsum boards include gypsum boards in which the surface of the gypsum board is covered with base paper for boards, and glass mat gypsum boards in which the surface of the gypsum board is covered with a glass fiber mat (sheet).

[0139] According to the gypsum board manufacturing apparatus of this embodiment, since the supply device described above is used, the position of the widthwise end of the conveyed coating material can be detected, and even if the position of the widthwise end of the coating material changes, the liquid material can be supplied and applied to the desired position. Therefore, problems caused by the inability to apply the liquid material to the appropriate application position, such as poor adhesion at the adhesive part of the coating material, can be suppressed. As a result, the occurrence of defective gypsum boards that do not meet the specifications can be suppressed. [Method of manufacturing gypsum boards] The method for manufacturing gypsum boards according to this embodiment may include a liquid material supply step of supplying a liquid material to a coating material using the liquid material supply device for gypsum boards described above.

[0140] The method for manufacturing gypsum boards according to this embodiment may include, for example, the following steps.

[0141] The gypsum slurry preparation process involves mixing calcined gypsum, the raw material for gypsum slurry, with water, and, if necessary, various additives, to prepare the gypsum slurry.

[0142] A liquid material supply process in which a liquid material is supplied onto a coating material using a liquid material supply device for gypsum boards.

[0143] A molding process in which gypsum slurry is supplied between two covering materials, and the gypsum slurry is formed into a plate shape.

[0144] A curing process for hardening the plate-shaped molded body obtained in the molding process.

[0145] Each step will be explained using the example of gypsum board being manufactured. (Gypsum slurry preparation process) In the gypsum slurry preparation process, the calcined gypsum mentioned above, water, and optionally various additives and foam are mixed together to prepare the gypsum slurry.

[0146] For example, as explained in the section on gypsum board manufacturing equipment, these raw material components can be mixed using a mixer or the like to prepare a gypsum slurry. The raw materials for the gypsum slurry have already been explained, so their explanation will be omitted here. (Liquid material supply process) In the liquid material supply process, a liquid material supply device for gypsum boards can supply and apply the liquid material to the coating area of ​​the base paper for the board, such as the base paper for the second board, which is the coating material. The liquid material supply device and the like have already been explained, so their explanation will be omitted here. (molding process) The molding process involves supplying the gypsum slurry obtained in the gypsum slurry preparation process between two sheets of base paper for the board, and molding it into a board shape.

[0147] For example, as previously described in the gypsum board manufacturing apparatus, a high-density first gypsum slurry 63 and a low-density second gypsum slurry 64 are formed in advance during the gypsum slurry molding process. Then, in the molding process, a continuous laminate can be formed by layering the high-density first gypsum slurry 63, the low-density second gypsum slurry 64, and the high-density first gypsum slurry 63 in that order between the first board base paper 611 and the second board base paper 612. Next, the laminate can be passed through a molding machine 68 that determines the thickness of the gypsum board to form a plate, thereby forming a gypsum slurry molded body.

[0148] However, the form is not limited to the above, and in the molding process, a gypsum slurry of the desired density can be supplied between the base paper for the board and molded into a plate shape using a molding machine. (hardening process) After the molding process, a curing process can be carried out. The curing process is a process of curing the gypsum slurry molded body obtained in the molding process.

[0149] The hardening process can be carried out by the hydration reaction of calcined gypsum (hemihydrate gypsum) in the gypsum slurry, which generates needle-shaped crystals of dihydrate gypsum, causing it to solidify. Therefore, within the molded body formed in the molding process, the calcined gypsum added to the gypsum slurry reacts with water, and the hydration reaction of the calcined gypsum proceeds, thereby carrying out the hardening process.

[0150] Furthermore, the method for manufacturing gypsum boards may include any additional steps. Specifically, for example, it may include the following steps.

[0151] A first cutting step for cutting a gypsum slurry molded body.

[0152] A drying process for drying the cut gypsum slurry molded body.

[0153] The second cutting process involves cutting the gypsum board.

[0154] (1st cutting process) In the first cutting step, the gypsum slurry molded body can be cut. After the gypsum slurry molded body is formed in the molding step, the gypsum slurry gradually hardens. Therefore, the first cutting step can be performed, for example, during the hardening step or after the hardening step has been completed. However, it is preferable to perform the first cutting step after the hardening step has progressed to a degree where the gypsum slurry molded body can be cut.

[0155] The first cutting step can also be called a rough cutting step, and allows the gypsum slurry molded body to be cut to a desired size, for example, depending on the size of the dryer used in the drying step described later. (drying process) In the drying process, excess moisture contained in the gypsum slurry molded body can be dried. The molded body, after the curing process has been completed, can be supplied to the drying process. The drying process can be carried out by forcibly drying the molded body using a dryer.

[0156] The method of forcibly drying molded bodies using a dryer is not particularly limited, but for example, a dryer can be installed on the transport path of the molded bodies, allowing them to be dried continuously as they pass through the dryer. Alternatively, molded bodies can be brought into the dryer and dried in batches. (2nd cutting process) For example, it may have a second cutting step for cutting gypsum boards.

[0157] The second cutting step can be performed, for example, after the drying step, and the product can be cut to the desired size.

[0158] In the gypsum board manufacturing method of this embodiment, since the liquid material supply process is carried out using the supply device described above, the position of the end in the width direction of the conveyed coating material can be detected, and even if the position of the end in the width direction of the coating material changes, the liquid material can be supplied and applied to the desired position. Therefore, problems caused by the inability to apply the liquid material to the appropriate application position, such as poor adhesion at the adhesive part of the coating material, can be suppressed. As a result, the occurrence of defective gypsum boards that do not meet the specifications can be suppressed. [Note] (1) A liquid material supply device for gypsum boards according to one aspect of the present disclosure is a liquid material supply device for gypsum boards that supplies a liquid material to a coating material of a gypsum board, A tank for storing the aforementioned liquid material, A liquid material supply pipe connected to the tank and supplying the liquid material, A displacement device for displacing the position of the liquid material supply pipe, An end detection device for detecting the position of the end of the covering material in the width direction, The system includes a control device that displaces the position of the liquid material supply pipe using the displacement device in accordance with the position of the end of the covering material in the width direction detected by the end detection device. (2) In (1) above, the end detection device comprises a first laser sensor and a second laser sensor arranged along the width direction of the covering material, The control device may, when the covering material is located at the projection position of the first laser sensor and not at the projection position of the second laser sensor, displace the position of the liquid material supply pipe using the displacement device to match the position of the end of the covering material in the width direction. (3) The above (2) further comprises a support to which the liquid material supply pipe and the end detection device are fixed, The displacement device displaces the position of the support along the width direction of the covering material, thereby displacing the positions of the liquid material supply pipe and the end detection device. The control device may use the displacement device to displace the position of the support so that the covering material is located at the light emission position of the first laser sensor and not at the light emission position of the second laser sensor. (4) In any of (1) to (3), the liquid material supply pipes may be located at both ends in the width direction of the covering material. (5) In any of (1) to (4), the end detection device detects the position of one end of the covering material in the width direction, The displacement device may displace the position of the liquid material supply pipe located at one end of the covering material in the width direction. (6) A gypsum board manufacturing apparatus according to one aspect of the present disclosure includes a liquid material supply apparatus for gypsum boards as described in any of (1) to (5). (7) A method for manufacturing a gypsum board according to one aspect of the present disclosure includes a liquid material supply step of supplying the liquid material to the coating material using a liquid material supply device for gypsum boards described in any of (1) to (5).

[0159] Although a liquid material supply device for gypsum boards, a gypsum board manufacturing device, and a method for manufacturing gypsum boards have been described above with reference to embodiments, the present invention is not limited to the above embodiments. Various modifications and changes are possible within the scope of the gist of the present invention as described in the claims.

[0160] This application claims priority based on Japanese Patent Application No. 2022-131120, filed with the Japan Patent Office on 19 August 2022, and the entire contents of Japanese Patent Application No. 2022-131120 are incorporated herein by reference. [Explanation of Symbols]

[0161] 11, 12, 13 Gypsum board 11A, 12A, 13A ends 110, 120, 130 gypsum core 111, 121, 131 Base paper for the first board 112, 122, 132 Base paper for the second board 111A, 111B Corner 121A, 121B, 121C Corner 131A, 131B, 131C Corner 113, 123, 133 Adhesive part α edge angle 10 Covering material 10A, 10B end 100A, 100B coating area A Block Arrow B Arrow 20 Feeding device 21A, 21B 1st liquid material supply pipe 22A, 22B outlet 23A, 23B Drive unit (displacement unit) 24 Linear motion mechanism (displacement device) 25 End detection device 251 Fixed base material 252A First Laser Sensor 252B Second Laser Sensor 253A, 253B L-shaped bracket 254 Shim Plate L distance 26A, 26B Control Unit 27A, 27B Support 28A, 28B Spread members 29 Rollers 30A, 30B pumps 31 tanks 32 Main Tank 33 Third liquid material supply pipe 34 Second liquid material supply pipe 35 Liquid materials 51, 52 Floodlight position 60 Gypsum board manufacturing equipment 611 Base paper for the first board 612 Base paper for the second board 62 Mixer 621, 622, 623 preparative port 63. First gypsum slurry 64. Second Gypsum Slurry 651, 652 Delivery pipe 653 Pipeline 66 Roller Coater 661 Coating roller 662 Receiving roller 663 Scum Removal Roller 67 Turning Roller 68 Molding machine 69. Gypsum slurry molded body

Claims

1. A liquid material supply device for gypsum boards that supplies a liquid material to the coating material of a gypsum board, A tank for storing the aforementioned liquid material, A liquid material supply pipe connected to the tank and supplying the liquid material, A displacement device for displacing the position of the liquid material supply pipe, An end detection device for detecting the position of the end of the covering material in the width direction, The control device includes a device that displaces the position of the liquid material supply pipe using the displacement device in accordance with the position of the end of the covering material in the width direction detected by the end detection device, The end detection device comprises a first laser sensor and a second laser sensor arranged along the width direction of the covering material. The control device is a liquid material supply device for gypsum boards that, when the coating material is located at the projection position of the first laser sensor and the coating material is not located at the projection position of the second laser sensor, displaces the position of the liquid material supply pipe with the displacement device to match the position of the end of the coating material in the width direction.

2. The system further comprises a support to which the liquid material supply pipe and the end detection device are fixed, The displacement device displaces the position of the support along the width direction of the covering material, thereby displacing the positions of the liquid material supply pipe and the end detection device. The liquid material supply device for gypsum board according to claim 1, wherein the control device displaces the position of the support using the displacement device such that the covering material is located at the light emission position of the first laser sensor and the covering material is not located at the light emission position of the second laser sensor.

3. The liquid material supply device for gypsum board according to claim 1 or claim 2, wherein the liquid material supply pipes are arranged at both ends in the width direction of the covering material.

4. The end detection device detects the position of one end of the covering material in the width direction, The liquid material supply device for gypsum board according to claim 1 or claim 2, wherein the displacement device displaces the position of the liquid material supply pipe located at one end of the covering material in the width direction.

5. A gypsum board manufacturing apparatus comprising a liquid material supply device for gypsum boards according to claim 1 or claim 2.

6. A method for manufacturing a gypsum board, comprising a liquid material supply step of supplying the liquid material to the coating material using a liquid material supply device for gypsum boards according to claim 1 or claim 2.

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