WO1999067074A1

WO1999067074A1 - Mixing-agitating machine and method of producing gypsum board using mixing-agitating machine

Info

Publication number: WO1999067074A1
Application number: PCT/JP1999/003160
Authority: WO
Inventors: Yasuo Kojima; Tadashi Takeda
Original assignee: Yoshino Gypsum Co., Ltd.
Priority date: 1998-06-22
Filing date: 1999-06-14
Publication date: 1999-12-29
Also published as: JP2000006137A; AU4166099A; JP4100766B2

Abstract

A mixer capable of effectively preventing the running-out of base paper during gypsum board production and an ensuing production interruption and a method of producing a gypsum board using the mixer, the mixer being provided at the slurry discharge port thereof with an attachment having a screening-out opening to thereby prevent the discharge from the mixer of large and solid lumps that are produced in the mixer to cause base paper running-out.

Description

TECHNICAL FIELD The present invention relates to a mixing stirrer and a method for producing a gypsum board using the mixing stirrer.

The present invention relates to a mixing stirrer (mixer) used in a gypsum board manufacturing process widely used as a building material, particularly as an interior material, and a method for manufacturing a gypsum board by using the mixer. Background art

Gypsum board is widely used as a building interior material because of its fire resistance, sound insulation, workability, and economy. Such a gypsum board is a plate-like body in which a gypsum-based core is covered with a gypsum board base paper (hereinafter referred to as base paper). In the production, plaster of Paris, an adhesion aid, a curing accelerator, and a light-weight gypsum are used. Foam, other additives, etc., as well as an admixture and water, and the resulting calcined gypsum slurry (hereinafter referred to as "slurry") is poured between upper and lower base paper, and It is formed into a plate shape by passing between the forming rolls and between the upper and lower plates, then hardened on a conveyor belt, roughly cut, forcedly dried, and cut into product dimensions.

Here, the above-mentioned slurry is generally manufactured using a thin circular mixer. Such a mixer generally has a fixed flat circular casing, and a turntable rotatably disposed in the casing, and a plurality of kneading components is provided near a central region of an upper lid of the casing. A supply port is provided, and a discharge port for discharging the kneaded slurry is provided on the outer periphery of the housing (annular wall). Further, a rotating shaft for rotating the rotating disk and a driving device for the rotating shaft are connected to the rotating disk. The housing has a plurality of upper pins that hang down to the vicinity of the turntable. ^ There is a lower pin extending to the vicinity, the upper and lower pins are arranged in the radial direction, and the plurality of kneading components to be kneaded are supplied to the upper region of the turntable through the respective supply ports. The supplied components for kneading move radially outward on the turntable by the action of centrifugal force while being agitated and mixed, and are discharged out of the machine from a discharge port arranged on the outer peripheral portion. Kneaders of this type are 呼ば, for example, as disclosed in US Pat. No. 3,459,620.

Further, as a kneader of a type other than the pin-type kneader, for example, there is a kneader disclosed in Japanese Patent Publication No. 58-169292, but the kneader includes a housing, A rotating disk disposed in a housing, and a plurality of deflecting blades are disposed on an upper surface of the rotating disk. In the peripheral portion of the turntable, there is formed a tooth or a tooth profile for notching the kneading component outwardly, and a discharge port is provided in a lower lid of the housing below the tooth profile. Have been.

Furthermore, as a measure to prevent strength loss and poor adhesion due to excessive drying of the gypsum board due to forced drying of the gypsum board, high specific gravity mud at the edge or the edge area and low density near the center area are taken. In order to produce a slurry with a specific gravity using a single kneader, the annular wall close to the rotating plate is hung down from the outer periphery of the upper lid, the interior of the mixer is divided into two areas, and the foam supply unit is located on the outer periphery of the upper lid of the housing. The foam is injected into the housing by being provided on the side of the housing, and simultaneously producing slurry of different specific gravities, and a plurality of drains disposed on the outer peripheral portion (annular wall) or the outer peripheral region of the lower lid of the housing. A kneader that discharges slurry having different specific gravities from an outlet is disclosed in Japanese Patent Application Laid-Open No. 6-164052.

However, in any of the above kneaders, when the components for kneading are kneaded, the slurry adheres to the surface of the rotating plate and the surface under the Z or the top lid and hardens, which grows into a large and strong attachment. The broken hardened body is crushed by the centrifugal force to the outside of the turntable radius and shreds into small pieces, which are then discharged out of the machine together with the moving slurry through the outlet. Then, the discharged slurry containing the strong kashiwa (cured gypsum) is then poured between the upper and lower base papers and guided to a molding machine, for example, between the vertically arranged molding rolls or between the plates. It is formed into a plate shape. At this time, since the above-mentioned roll interval and plate interval are set to approximately the product thickness, if there is a large and strong kashiwa longer than the set interval (product thickness) in the slurry, the kashiwa will be used to make the base paper. A tear will occur, the base paper will break and the production of gypsum board will be interrupted.

In the event of this production interruption, the mixer must be removed in order to avoid having to remove the hardened material caused by the hardening of the slurry in the kneader (disassembly 'removal' assembly). After the slurry in the sir is completely discharged, the mixer is stopped. Therefore, when an out-of-paper accident occurs, the work (removal / cleaning) of the hardened slurry discharged before the mixer stops and the work of cleaning the molding machine and conveyor belt, etc., are inevitably required, and a great deal of labor is required. In addition to spending, the productivity of gypsum board is significantly reduced.

The present invention has been made in view of such a point, and an object of the present invention is to limit the discharge of large and strong kashiwa, which causes the breaking of base paper from a mixer, without interrupting the production of gypsum board. Another object of the present invention is to provide a mixer capable of stably producing gypsum board and a method for producing a gypsum board using the mixer. Disclosure of the invention

To achieve the above object, the present invention provides a mixer used in the production of a gypsum board, wherein a slurry discharge outlet is provided with an attachment having a sorting through opening. And a method for producing a gypsum board using the mixer. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a process explanatory view partially and schematically showing a gypsum board forming process.

FIG. 2 is a perspective view of the mixer, (a) is a perspective view of a mixer in which a discharge port is provided in an annular wall, and (b) is a discharge port in a peripheral region of a lower lid of the housing. FIG. 4 is a perspective view of the mixer that was provided.

FIG. 3 is a front view of the inside of a discharge port provided with an attachment having a sorting through-opening provided in the annular wall of the mixer, wherein (a) and (b) show the sorting through-opening. Indicates that the part is a slit-shaped attachment (a is a slit perpendicular to the circumferential direction of the annular wall, and b is a slit parallel to the circumferential direction of the annular wall),

(c) is a diagram showing that the sorting through opening is a grid-like attachment. BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments.

In a preferred embodiment of the present invention, the attachment is composed of an aggregate of openings having a large number of openings that do not allow large and strong kashiwa to be selected and pass therethrough, and the shape of the openings is any as long as the size of Kashiwa can be selected. Such a shape can be used. Among them, a preferable example of the shape of the opening is a grid (grid) shape or a slit (blind) shape. In particular, it is preferable to use an opening having a shape in which a slit parallel to the circumferential direction of the annular wall is provided.

The above-mentioned attachment can be applied to all of the outlets provided in the mixer. For example, one or more outlets provided in the annular wall, or one or more outlets provided in the outer peripheral region of the lower cover of the housing. Can be attached to The size of the attachment is designed to correspond to that of the outlet.

Further, the present invention provides a method for producing a gypsum board, characterized by using the mixer of the present invention when obtaining gypsum slurry in a method for producing a gypsum board in order to achieve the above object.

In a preferred embodiment of the present invention, the gap between the grid or the slit in the through-opening of the attachment is formed by a molding machine, for example, a gap such as a vertically arranged molding roll or a vertically arranged plate (plaster to be manufactured). (Equivalent to the thickness of the board product). By doing so, the large and strong kashiwa generated in the mixer is not discharged outside the machine even if it is brought to the discharge port together with the slurry moving radially outward of the turntable due to the centrifugal force. While being circulated, they are fragmented to a size that can pass through the attachment and discharged outside the machine. Therefore, the size of the discharged Kashiwa is smaller than the gap of the molding machine into which the slurry is guided, and it is possible to effectively prevent the base paper from being broken due to strong cakes when forming the gypsum board. Example

Next, the present invention will be described more specifically with reference to embodiments illustrated in the drawings. It should be noted that the present invention is not limited to the following embodiments, and the present invention can naturally be applied to a mixer using a well-known method. FIG. 1 is a process explanatory view partially and schematically showing a gypsum board forming process. Base sheet 1 of the base paper is transported along the production line. A mixer or kneader (hereinafter, referred to as a mixer) 10 is disposed at a predetermined position associated with the transport line, for example, above the transport line. Gypsum, an adhesion aid, a curing accelerator, other additives, and water are supplied to the mixer 10, the raw materials are kneaded by the mixer 10, and the resulting mud 2 is discharged from the discharge port through the discharge pipe. Is supplied to the undersheet 1 via The discharge pipe discharges the slurry 2 to the central area of the backing paper 1 in the width direction.

The backing paper 1 is transported together with the slurry 2 spreading in the width direction and reaches a pair of rolls 3 and 3. When the upper paper 4 partially turns around the outer periphery of the upper roll 3 and is turned in the direction of the transport line, and the turned upper paper 4 comes into contact with the slurry on the lower paper 1 and passes between the rolls 3 and 3 Then, the slurry 2 is formed into a plate-shaped gypsum board in which the slurry 2 is covered with the base papers 1 and 4 and transferred in the direction of the transport line. The plate-like body reaches the rough cutting machine 5 while being hardened. The plate is roughly cut to a predetermined length, passed through a dryer and cut to a predetermined product length, thus producing a gypsum board product. The thickness of the product is determined by the gap between the rolls 3,3.

FIG. 2 is a perspective view of the mixer 10. FIG. 2A is a perspective view of the mixer 10 in which a discharge port 34 is provided in an annular wall 23, and FIG. 2B is a perspective view of the mixer 10. FIG. 3 is a perspective view of a mixer 10 provided in a circumferential area of a lower cover 22 of a housing 20. FIG. 3 is a front view of the inside of a discharge port 34 provided with an attachment 33 having a sorting through-opening 32 provided in an annular wall 23 of the mixer 10, wherein (a) and ( (b) shows that the sorting through opening 32 is a slit-shaped attachment 33, and (c) shows that the sorting through opening 32 is a grid-shaped attachment 33.

As shown in FIG. 2, the mixer 10 has a flat casing (housing) 20, and the casing 20 is composed of a horizontal disc-shaped upper lid 21 and a lower lid 22 at predetermined intervals. And an annular wall 23 arranged on the outer peripheral portion of the upper lid 21 and the lower lid 22. A circular opening 24 is formed at the center of ± ^ 21, and the enlarged lower end 26 of the vertical rotating shaft 25 penetrates the circular opening 24, and a rotation built in the housing 20. It is connected to a panel (not shown). The rotary shaft 25 is connected to a rotary drive (not shown). As shown in FIG. 3, the annular wall 23 has a grid-like or Is provided with a slurry discharge port (separation port) 34 on which a slit-like attachment 33 is set, and is connected to a discharge pipe 36 via a conduit 35. A powder supply port 27 for supplying raw materials, a water supply port 28, and a foam supply port 29 for adjusting the volume of the slurry are connected to predetermined positions on the upper lid 21. . Although not shown, pins are implanted at predetermined positions on the turntable and the bottom surface of the upper lid 21 in a well-known state, and the outer periphery of the turntable is similarly cut in a well-known state. A missing tooth profile is provided.

For the production of gypsum board, for example, 9.5 mm thick gypsum board, the annular wall

23 An outlet 3 4 made of steel with an opening width of 7.5 mm as shown in Figure 3

A grid-shaped or slit-shaped attachment 33 having 3 2 is provided, and a predetermined amount of each of plaster of Paris, an adhesion aid, a curing accelerator, other admixtures, foam and water is supplied to a predetermined amount of the upper lid 21. Is supplied to the rotating mixer 10 from the powder supply port 27, the water supply port 28, and the foam supply port 29 provided at the respective positions, and the slurry 2 obtained by kneading is supplied to the IUI by itself or in the form of a slip. From the discharge outlet 34 provided in the annular wall 23 provided with the attachment 33 in the form of a bottom, through the conduit 35 to the central area of the width of the lower sheet 1 below the discharge pipe 36, and the lower sheet 1 With the slurry 2 spreading in the direction of both edges of the width 9.

Transfer between a pair of rolls 3, 3 set to 5 mm.

The upper paper 4 is partially turned around the outer periphery of the upper roll 3 and turned in the direction of the transport line.The turned upper paper 4 is brought into contact with the slurry 2 on the lower paper 1 and passed between the rolls 3 and 3. To form a gypsum board in the form of a plate in which the slurry 2 is covered with the base papers 1 and 4 and transported in the direction of the transport line. The plate-like body, while hardening, reaches the rough cutting machine 5, and the plate-like body is roughly cut to a predetermined length, passed through a dryer, cut to a predetermined product length, and thus, 9. A 5 mm thick gypsum board product is manufactured.

The large and strong kashiwa generated in the mixer is not discharged out of the machine by the grid-shaped or slit-shaped attachment 33, and the discharged kashiwa is rolled by press-forming rolls 3 and 3. It is smaller than the interval, and there is no accident of breaking the base paper due to the discharge of the mixer, and continuous operation is possible without interrupting production. Industrial applicability A) As described above, by disposing at the discharge port of the mixer used in the production of the gypsum board, for example, an aperture having a sorting through opening including a grid-shaped or slit-shaped opening, Large and strong kashiwa produced in the mixer during the kneading of each kneading component constituting the gypsum board is discharged outside the machine even if it is brought to the discharge port together with the slurry moving radially outward of the turntable due to centrifugal force. After being circulated in the machine, it is fragmented to a size that allows it to pass through the attachment and then discharged out of the machine. For this reason, in the production of gypsum board, the occurrence of out-of-stock paper due to the discharge of kashiwa from the mixer is prevented, the production is not interrupted, and a great deal of labor at the time of interruption can be eliminated and production is lost. The gypsum board productivity can be improved without the need.

Claims

The scope of the claims

1. A mixing stirrer used in the production of gypsum board, wherein an attachment having a screening opening is provided at a slurry discharge port.

2. The mixing stirrer according to claim 1, wherein the shape of the selection through opening of the attachment is a grid shape or a slit shape.

3. The mixing stirrer according to claim 1, wherein a shape of a selection through opening of the attachment is a slit shape parallel to a circumferential direction of the annular wall.

4. A method for producing a gypsum board, comprising using the mixing stirrer according to any one of claims 1 to 3 to obtain gypsum slurry.