JP4062439B2 - Method for adjusting specific gravity of mud and foam amount control method in gypsum board manufacturing process - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for adjusting the specific gravity of foam and a method for controlling the amount of foam, and more specifically, a method for adjusting the specific gravity of foam and the amount of foam applied to a manufacturing process of gypsum board widely used as a building material, particularly an interior material. It relates to a control method.
[0002]
[Prior art]
Gypsum board is widely used as an interior material for buildings because of its fire resistance, sound insulation, workability and economy. Such a gypsum board is a plate-like body in which a core mainly composed of gypsum is coated with a base paper for gypsum board. During production, calcined gypsum, an adhesion aid, a curing accelerator, foam for reducing weight, etc. In addition, the admixture and water are kneaded, and the resulting calcined gypsum slurry (hereinafter referred to as mud) is poured between the upper and lower gypsum board base paper and molded into a plate shape. Thereafter, it is roughly cut after curing, and cut into product dimensions after forced drying.
[0003]
Here, the slurry is generally manufactured using a thin circular mixer. Such a mixer generally has a fixed flat circular casing and a rotating disk rotatably disposed in the casing, and a plurality of kneading component supply ports are disposed in the central region of the upper lid of the casing. A discharge port for discharging the kneaded material is disposed on the outer periphery of the housing. A rotating shaft for rotating the rotating disk and a driving device for the rotating shaft are coupled to the rotating disk. The upper lid or upper plate of the housing includes a plurality of upper pins that hang down to the vicinity of the rotating plate, the rotating plate has a lower pin that is implanted on the rotating plate and extends to the vicinity of the upper lid, and the upper and lower pins are The plurality of components that are alternately arranged in the radial direction and to be kneaded are supplied to the upper area of the rotating disk via the supply ports. The supplied components are stirred and mixed, move radially outward on the rotating disk by the action of centrifugal force, and are discharged out of the machine from the discharge port arranged on the outer periphery. This type of kneader is called a pin-type kneader, and this type of kneader is disclosed, for example, in US Pat. No. 3,459,620.
[0004]
Further, as a kneader of a type other than the pin type kneader, for example, the kneader disclosed in Japanese Examined Patent Publication No. 58-16929 includes a casing and a rotating disk disposed in the casing. A plurality of deflection blades are disposed on the upper surface of the rotating disk. In addition, the tooth | gear part or tooth profile part which presses a kneading | mixing material outward is formed in the peripheral part of a rotary disk.
[0005]
Generally, in the gypsum board in the forced drying process, the drying rate of the edge portion or the edge region of the gypsum board is relatively faster than the drying rate of the central portion in the width direction of the gypsum board. For this reason, strength reduction and poor adhesion due to excessive drying are likely to occur at the edge portion. As a measure to prevent such excessive drying, a part of the kneaded slurry is introduced into a sub-mixer that rotates at high speed and re-stirred to destroy or eliminate bubbles in the slurry to increase the specific gravity of the slurry, thus obtaining The resulting high specific gravity slurry is discharged or discharged onto the lower paper corresponding to the edge portion of the gypsum board.
[0006]
[Problems to be solved by the invention]
However, in such a sub-mixer system, the slurry in the sub-mixer is re-kneaded by high-speed rotation, and the slurry hardening time is shortened. For this reason, retarders must be added to the slurry to intentionally delay the cure time of the slurry. However, the adjustment of the curing time and the amount of addition of the retarder are difficult to control.Therefore, clogging or jamming of the mixer sometimes occurs, and it is necessary to stop the operation of the mixer and the production line accompanying this. It is forced.
[0007]
In addition, since the auxiliary mixer rotates at a high speed, the rotating disk of the auxiliary mixer is easily worn, and maintenance and inspection work of the auxiliary mixer is a considerable work burden.
Further, the defoaming capacity of the sub-mixer is limited, and it is difficult to continuously and stably supply the slurry having the required high specific gravity.
Moreover, the foam supplied to the mixing stirrer (main mixer) disappears considerably in the mixing stirrer before it is led out from the slurry feed outlet by the stirring action in the mixing stirrer, and is further increased by the defoaming action of the sub mixer. Since it disappears, there is a situation in which the amount of foam to be supplied to the mixing stirrer must be increased.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to supply a kneading material and kneading water to a mixing stirrer and continuously feed gypsum slurry in the outer peripheral region of the casing from the slurry feed outlet. In the gypsum board manufacturing process where gypsum mud is continuously fed to a predetermined part of the gypsum board production line via a mud delivery pipe that is fed to the outside of the machine and communicated with the mud delivery outlet, the amount of foam used can be reduced. An object is to provide a method for adjusting the specific gravity of a slurry and a method for controlling the amount of foam.
[0009]
In the gypsum board manufacturing process, the present invention is also capable of adjusting the specific gravity of the gypsum board in the gypsum board manufacturing process that can stably supply different types of sludge having a specific gravity difference with a single mixing stirrer without increasing the amount of foam used. It is an object to provide a method and a foam amount control method.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention supplies the kneading material and kneading water to a mixing stirrer having a rotating disk that is driven to rotate in a circular enclosure, and the mixing of the gypsum slurry that has been substantially mixed is retained. The slurry is continuously fed to the outside from the slurry feed outlet located in the outer peripheral region of the casing of the stirrer, and the slurry is supplied to a predetermined part of the gypsum board production line through a slurry delivery pipe communicating with the feed outlet. A slurry specific gravity control method applied to a gypsum board manufacturing process for continuous supply,
An annular partition wall that hangs down to the vicinity of the upper surface of the rotating disk is disposed on the upper lid of the circular housing, and the central region and the outer peripheral region are partitioned by the annular partition wall, and unmixed slurry and mixed slurry are separated. And
Supplying the kneading material and kneading water to the central area on the rotating disk, moving the rotating disk on the rotating disk to the outer peripheral area radially outward by the action of centrifugal force while stirring and mixing,
Supplying a predetermined amount of foam for mud adjustment from the outer peripheral region, the outlet or the delivery pipe to the slurry fed from the outer peripheral region via the delivery port and the delivery pipe, A method for adjusting the specific gravity of a slurry is provided, wherein the specific gravity of the slurry is adjusted.
[0011]
The present invention also provides a kneading material and kneading water to a mixing stirrer having a rotating disk that is rotationally driven in a circular casing, and the outer periphery of the casing of the mixing stirrer in which gypsum slurry that has been substantially mixed is retained. Gypsum board manufacturing that continuously feeds the slurry from the slurry delivery outlet located in the region and continuously supplies the slurry to a predetermined part of the gypsum board production line via a slurry delivery pipe communicating with the delivery outlet A foam amount control method applied to a process,
An annular partition wall that hangs down to the vicinity of the upper surface of the rotating disk is disposed on the upper lid of the circular housing, and the central region and the outer peripheral region are partitioned by the annular partition wall, and unmixed slurry and mixed slurry are separated. And
Supplying the kneading material and kneading water to the central area on the rotating disk, moving the rotating disk on the rotating disk to the outer peripheral area radially outward by the action of centrifugal force while stirring and mixing,
Supplying a predetermined amount of foam for mud adjustment from the outer peripheral region, the outlet or the delivery pipe to the slurry fed from the outer peripheral region via the delivery port and the delivery pipe, A foam amount control method is provided, wherein foam is uniformly mixed in the slurry and defoaming is suppressed.
[0014]
The kneaded slurry generally contains calcined gypsum, adhesion aid, curing accelerator, foam for weight reduction, other additives, admixture, water, etc. Including.
[0015]
According to a preferred embodiment of the present invention, the foam supply port disposed in the upper lid (upper plate) of the casing is supplied with liquid or water supply so that the foam is uniformly mixed in the slurry and the defoaming is suppressed. Positioned downstream of the mouth in the rotational direction.
[0016]
In another preferred embodiment of the present invention, a plurality of tooth profile portions are disposed between a central region in the housing and an annular wall on the outer periphery of the housing, and the tooth profile portions are disposed in the outer peripheral region of the rotating disk. It is formed. The components to be kneaded move outward on the rotating disk by the action of centrifugal force while being agitated and mixed, and the slurry is from the outer peripheral region where the mixed slurry is substantially retained (hereinafter referred to as the slurry retaining region). Then, it passes through the rotating tooth profile and is introduced into the mud delivery port. Further, the position of the slurry delivery outlet is arranged on one or both of the bottom cover (lower plate) or the annular wall of the housing located in the slurry retention area, and the number of the slurry delivery outlets is determined according to the purpose, application, or design conditions. It is set appropriately according to For example, the mud delivery port can be provided in the housing at one place or two places or more. In addition, when arranging a slurry delivery outlet on the bottom lid or lower plate located in the slurry retention area, the tooth profile is an essential component of the rotating disk, but when providing a slurry delivery outlet on the annular wall, It is possible to omit the tooth profile.
[0017]
Further, the high specific gravity slurry in a state before mixing with foam is collected, for example, a material for an edge core material (core) of a gypsum board, a material for applying an adhesive surface of a base paper for gypsum board, or gypsum It can be used as a surface layer material or a covering material of the core material of the board.
[0018]
According to a preferred embodiment of the present invention, an annular partition wall that hangs down to the vicinity of the upper surface of the rotating disk is disposed on the upper lid of the casing, and the annular partition wall includes a mud retention area on the outer periphery of the rotating disk, a central area of the rotating disk, and The unmixed slurry and the mixed slurry are separated. Thereby, a uniform slurry having a large specific gravity can be reliably obtained from the outer peripheral region of the mixing agitator. When the place where the slurry is used or the supply part is separated from the mixing stirrer, a feed or pressure pump is disposed in a pipe line communicating with the sorting port, and the slurry is supplied to the slurry use part or the cover. You may pressure-feed to a supply part.
[0019]
Moreover, the structure of the mixing stirrer of this invention is applicable to both the conventional pin type mixer and a pinless mixer (for example, blade | wing type mixer etc.).
[0020]
[Action]
The specific gravity of the slurry is mainly determined by the amount of mixed foam, excluding the factor of the amount of mixed water. When the foam is introduced into the central region of the mixing stirrer, the foam disappears considerably due to the impact of the stirring action before being led out from the slurry delivery port. Since a predetermined amount of foam for adjusting the slurry is supplied to the mud fed to the outside through the delivery pipe at the outer peripheral region, the slurry delivery outlet or the slurry delivery pipe, the foam is not easily defoamed. Therefore, the defoaming action in the mixing stirrer is suppressed or reduced, and the amount of foam used is reduced.
[0022]
In addition, by supplying foam from the slurry delivery outlet or the slurry delivery pipe to the slurry fed from the slurry delivery outlet to the outside of the machine, the amount of foam mixed in the mixing stirrer and the amount of foam mixed outside the mixing stirrer Can be adjusted arbitrarily and reliably. This makes it possible to relatively easily obtain two types of slurry having an arbitrary specific gravity between the highest specific gravity and the lowest specific gravity with a single mixing stirrer.
[0023]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a process explanatory view partially and schematically showing a molding process of a gypsum board. The lower sheet 1 of the base paper for gypsum board is conveyed along the production line. A mixing stirrer or kneader (hereinafter referred to as a mixer) 10 is disposed at a predetermined position related to the transport line, for example, above the transport line. Powder, foam, and liquid (water) such as calcined gypsum, adhesion aid, curing accelerator, additive, admixture, etc. are supplied to the mixer 10, and the mixer 10 kneads these raw materials, and the pipelines 12, 14 The slurry (calcined gypsum slurry) 3 is fed onto the lower paper 1 via The pipe 14 is piped so as to discharge the slurry 3 to the central region in the width direction of the lower paper 1. On the other hand, the pipe line 12 includes a pair of pipes 12 a and 12 b, and each pipe 12 a and 12 b discharges the slurry 3 to both end portions (edge regions) in the width direction of the lower paper 1.
[0024]
The lower paper 1 is transferred together with the slurry 3 and reaches the pair of forming rollers 16 and 16. The upper paper 2 partially turns around the outer circumference of the upper roller 16 and is turned in the conveyance line direction. The turned upper paper 2 is in contact with the slurry on the lower paper 1 and substantially parallel to the lower paper 1. It is transferred in the direction of the transport line. Thus, a continuous laminate having a three-layer structure comprising the lower paper 1, the slurry 3 and the upper paper 2 is formed, and the laminated body reaches the rough cutting rollers 18 and 18 while being cured. The rough cutting rollers 18, 18 cut a continuous laminated body into a predetermined length of plate body, and thus a platy body formed by covering a core mainly composed of gypsum with a base paper for gypsum board, that is, a gypsum board. Raw materials are formed. The coarsely cut laminate is further passed through a dryer, forcedly dried, and then cut to a predetermined product length, thus producing a gypsum board product.
[0025]
2 to 4 are a plan view, a perspective view, and a partially broken perspective view of the mixer 10. FIG. 5 is a longitudinal sectional view of the mixer 10, and FIG. 6 is a plan view of a rotating disk disposed in the mixer 10. As shown in FIG.
[0026]
As shown in FIGS. 2 and 3, the mixer 10 has a flat cylindrical housing or housing 20, and the housing 20 has a horizontal disk-shaped upper plate or upper lid 22 and a lower portion with a predetermined interval. A plate or bottom lid 24 (hereinafter referred to as an upper plate 22 and a lower plate 24) and an outer peripheral wall or an annular wall 23 disposed on the outer peripheral portions of the upper plate 22 and the lower plate 24 are provided.
[0027]
A circular opening 25 is formed at the center of the upper plate 22, and an enlarged lower end 31 of the vertical rotating shaft 30 passes through the circular opening 25. The rotary shaft 30 is connected to a rotary drive device, for example, an electric motor (not shown). If desired, a transmission, such as a transmission gear device or a belt-type transmission, is interposed between the rotary shaft 30 and the output shaft of the rotary drive device. The upper plate 22 includes a powder supply pipe 40 for supplying components to be kneaded, a water supply pipe 42 for supplying water for kneading, an internal pressure adjusting device 43 (indicated by a broken line) for regulating an excessive increase in internal pressure, First foam supply pipes 44 for supplying foam to the kneading component in order to adjust the volume are connected to each other at a predetermined angular interval. Further, a third foam supply pipe 41 for additionally supplying foam to the slurry in the inner region is connected to the upper plate 22.
[0028]
The annular wall 23 is connected to the upper end portion of the slurry feed pipe 48 via a hollow connecting portion 47. A second foam supply pipe 49 for supplying foam to the kneaded component is connected to the slurry feeding pipe 48. Preferably, the second foam supply pipe 49 is connected to the vicinity of the connecting portion 47 (in this example, the upper end portion of the slurry feed pipe 48) so that the foam introduced into the slurry is uniformly distributed in the slurry. The
[0029]
A sorting port 46 is disposed on the annular wall 23, and the sorting port 46 includes a pair of sorting ports 46a and 46b. The sorting ports 46a and 46b are respectively arranged on the annular wall 23 at a predetermined angular interval from the connecting portion 47, and are connected to the pipes 12a and 12b, respectively. The connecting portion 47 and the sorting ports 46 a and 46 b open to the inner wall surface of the annular wall 23 and communicate with the inside of the housing 20. The sorting ports 46a and 46b are arranged with an angular interval of a predetermined angle α from each other, and the sorting port 46a and the slurry feed pipe 48 in the front in the rotation direction are arranged with an angular interval of a predetermined angle β. . In addition, the first bubble supply pipe 44 is positioned within an angle range of the angle β at an interval of a predetermined angle γ from the sorting port 46a. The connecting portion 47 forms a slurry delivery outlet, and the slurry delivery pipe 48 constitutes a slurry delivery pipe.
[0030]
As shown in FIGS. 4 and 5, a rotating disk 32 is rotatably disposed in the housing 20. The central portion of the rotary disk 32 is fixed to the lower end surface of the enlarged lower end portion 31 of the rotary shaft 30, and the central axis of the rotary disc 32 coincides with the rotary axis of the rotary shaft 30. The rotating disk 32 rotates in the direction indicated by the arrow R (clockwise direction) by the rotation of the rotating shaft 30.
[0031]
The internal region of the housing 20 is divided into an inner region and an outer peripheral region by a virtual boundary 26. However, an annular partition wall that hangs from the lower surface of the upper plate 22 may be provided in the housing 20 along the boundary 26. In this case, the annular partition wall is disposed substantially concentrically with the annular wall 23, and the inner region of the housing 20 is located in the vicinity of the wear-resistant ring 23 a fixed to the inner wall surface of the annular wall 23. It is clearly defined in an outer peripheral region and an inner region located inward of the casing 20 in the radial direction.
[0032]
A large number of tooth profile portions 37 are formed in the outer peripheral region of the rotating disk 32. As shown in FIG. 6, each tooth profile portion 37 includes a rear end edge 37 a that extends substantially in the radial direction of the rotating disk 20 and a front end edge 37 b that is inclined forward at a predetermined angle with respect to the rotation direction. Prepare. Each front end edge 37b presses or biases the fluid to be kneaded in the rotational direction and outward.
[0033]
As shown in FIGS. 4 to 6, two pins 36 are implanted on each tooth profile 37. A plurality of pins 38 are arranged in the inner region, and the pins 38 are arranged on the upper surface of the rotating disk 32 in a plurality of rows extending in the radial direction. Each pin row 38 is aligned on a curved line extending from the outer periphery of the enlarged lower end portion 31 toward the pin 36 on the tooth profile portion 37. As shown in FIG. 5, a plurality of pins 28 depending from the upper plate 22 are arranged in the radial direction of the upper plate 22, and each pin 28 is positioned between the pins 38. Therefore, when the pin 38 moves in the direction of the rotation direction R, it passes through the region between the pins 28. The pins 28 and 38 are fixed to the rotary disk 32 and the upper plate 22 so as to be removable as necessary, and the number of the pins 28 and 38 can be increased or decreased as desired.
[0034]
Next, the operation of the mixer 10 will be described.
The rotary disk 32 is rotated in the direction of arrow R by the operation of the rotation driving device, the components to be kneaded by the mixer 10 are supplied through the powder supply pipe 40, and the kneading water is supplied through the water supply pipe 42. The The kneaded component and the feed water are introduced into the inner region of the mixer 10 and are mixed with stirring, and then move outward on the rotating disk 32 by the action of centrifugal force, and move beyond the boundary 26 to the outer peripheral region.
[0035]
A required amount of foam is supplied to the outer peripheral area via the first foam supply pipe 44 (FIG. 2) and mixed into the kneaded components in the outer peripheral area. The relatively light specific gravity slurry mixed with bubbles is pressed outward and forward in the rotational direction by the tooth profile portion 37, and introduced into the slurry feed pipe 48 via the connecting portion 47. The pin 36 on the tooth profile 37 scrapes off or scrapes off the mud adhering to the inner peripheral surface of the wear-resistant ring 23a.
[0036]
The slurry feed pipe 48 communicates with the pipe line 14 (FIG. 1), and the relatively light specific gravity slurry is discharged to the center region in the width direction of the lower paper 1. If desired, a required amount of foam is supplied to the slurry feed pipe 48 via the second foam supply pipe 49, and the specific gravity of the slurry is further adjusted to a light specific gravity.
[0037]
The slurry in the outer peripheral region is connected to the pipes 12a and 12b via the respective sorting ports 46a and 46b arranged upstream (rear in the rotation direction) of the first foam supply pipe 44 and downstream (forward in the rotation direction) of the connecting portion 47, respectively. And discharged to the edge region of the lower sheet 1 (FIG. 1) through the pipes 12a and 12b. The slurry in the vicinity of the sorting port 46a is the slurry before reaching the first foam supply pipe 44, that is, the slurry before the foam is supplied, and the slurry in the sorting port 46b is mixed with foam. It is a slurry that has been transported around the perimeter area over a considerable range and as a result has lost a significant amount of foam. Therefore, the slurry fed to the edge region via the sorting ports 46a and 46b has a relatively high specific gravity.
[0038]
Thus, the mixer 10 supplies a relatively low specific gravity of slurry to the central region of the lower sheet 1 via the slurry feed pipe 48 and the conduit 14, and relatively relatively via the sorting ports 46 a and 46 b and the conduit 12. A high specific gravity slurry is supplied to each edge region of the lower paper 1. Therefore, the gypsum board raw material transported to the dryer by the gypsum board production line (FIG. 1) includes relatively light specific gravity slurry in the central region and relatively heavy specific gravity slurry in the edge region. Dried uniformly in the side forced dryer.
[0039]
As described above, the mixer 10 includes the connecting portion 47 and the slurry feed pipe 48, the first foam supply pipe 44 for introducing the foam for adjusting the volume of the slurry, and the upstream side of the first foam supply pipe 44 (rear in the rotation direction). And a pair of fractionation ports 46a and 46b arranged on the downstream side (forward in the rotational direction) of the connecting portion 47, and the slurry feeding pipe 48 discharges the slurry to the central region of the lower sheet 1. The sorting ports 46 a and 46 b communicate with the conduit 12 that discharges the slurry to the edge region of the lower paper 1. According to such a mixer 10, low specific gravity slurry and high specific gravity slurry can be adjusted by a single mixer, respectively, and each specific gravity slurry can be supplied to a desired part of the gypsum board production line. Further, the use of the mixer 10 makes it possible to delay the curing of the edge region without using a curing retarder, and greatly simplifies the maintenance work of the equipment.
[0040]
Further, bubbles can be additionally mixed into the slurry in the slurry feed pipe 48 through the second foam supply pipe 49. Furthermore, the foam mixing into the slurry in the outer peripheral region may be introduced only from the first foam supply pipe 44 or may be introduced from the second foam supply pipe 49 only.
[0041]
In addition, in the said Example, although the mixer 10 is provided with the two fractionation ports 46a and 46b, for example, the pipe line 12 connected to the fractionation port 46a is omitted or not used. It is also possible to supply slurry to the left and right edge regions. Further, the sorting port may be arranged on the upper plate 22 or the lower plate 24.
[0042]
In the said Example, the mixer 10 was demonstrated as a pin type mixer. However, as will be readily appreciated by those skilled in the art, the configuration of the present invention is equally applicable to other types of mixers, such as a blade-type mixer with deflection blades. Further, an additional foam supply pipe, for example, the third foam supply pipe 41 for supplying foam to the inner region of the slurry can be provided in the mixer 10 to additionally supply the foam to the inner region of the slurry. . In this case, the different kinds of slurry obtained are both lightweight and have a large specific gravity difference, and are particularly suitable for producing a lightweight gypsum board.
[0043]
Further, the foam can be mixed into the slurry in the central region and the discharged slurry in the slurry feed pipe 48 via the third foam supply pipe 41 and the second foam supply pipe 49, respectively. In this way, the foam is mixed into the slurry through the third foam supply pipe 41 and the second foam supply pipe 49, for example, the specific gravity of the slurry in the central region in the mixer 10 is 0.8 to 0.9 gr / cm ³ . Set and the specific gravity of the discharge slurry is the same as the operation state in which the specific gravity of the discharge outlet of the mixer 10 is set to 0.65 to 0.70 gr / cm ³ , and bubbles are mixed only in the slurry in the central region. As a result of comparison with the operation state as described above, the amount of foam used for adjusting the volume of the slurry was reduced by about 50%.
[0044]
【The invention's effect】
As described above, according to the above-described configuration of the present invention, the kneading material and the kneading water are supplied to the mixing agitator, and the gypsum slurry in the outer peripheral region of the casing is continuously fed out of the machine from the slurry feeding outlet. Provided a method for adjusting the specific gravity of foam and a method for controlling the amount of foam in a gypsum board manufacturing process for continuously supplying gypsum slurry to a predetermined part of the gypsum board production line via a slurry delivery pipe communicating with the delivery port. Is done.
In addition, according to the present invention, in the gypsum board manufacturing process, a method for adjusting the specific gravity of a slurry and a foam that can stably supply different types of slurry having a specific gravity difference with a single mixing stirrer without increasing the amount of foam used. A quantity control method can be provided.
[Brief description of the drawings]
FIG. 1 is a process explanatory view partially and schematically showing a molding process of a gypsum board.
FIG. 2 is a plan view of the mixer shown in FIG.
FIG. 3 is a perspective view of the mixer shown in FIG. 1;
4 is a partially cutaway perspective view of the mixer shown in FIG. 1. FIG.
5 is a longitudinal sectional view of the mixer shown in FIG.
6 is a plan view of a rotating disk arranged in the mixer shown in FIGS. 2 to 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Mixer 12, 14 Pipe line 12a, 12b Pipe 20 Case or housing 22 Upper plate or upper lid 23 Circular wall 24 Lower plate or bottom lid 30 Rotating shaft 32 Rotating disks 28, 36, 38 Pin 40 Powder supply pipe 41 3 Foam supply pipe 42 Water supply pipe 44 First foam supply pipes 46, 46a, 46b Sorting port 47 Connecting portion 48 Mud feed pipe 49 Second foam supply pipe R Rotation direction

Claims (12)

A kneading material and kneading water are supplied to a mixing stirrer having a rotating disk driven to rotate in a circular enclosure, and the gypsum mud that has been substantially mixed is retained in the outer peripheral region of the casing of the mixing stirrer. It is applied to a gypsum board manufacturing process that continuously feeds the slurry from the delivery port to the outside of the machine and continuously supplies the slurry to a predetermined part of the gypsum board production line through a slurry delivery pipe communicating with the delivery port. A method for controlling the specific gravity of a slurry,
An annular partition wall that hangs down to the vicinity of the upper surface of the rotating disk is disposed on the upper lid of the circular housing, and the central region and the outer peripheral region are partitioned by the annular partition wall, and unmixed slurry and mixed slurry are separated. And
Supplying the kneading material and kneading water to the central area on the rotating disk, moving the rotating disk on the rotating disk to the outer peripheral area radially outward by the action of centrifugal force while stirring and mixing,
Supplying a predetermined amount of foam for mud adjustment from the outer peripheral region, the outlet or the delivery pipe to the slurry fed from the outer peripheral region via the delivery port and the delivery pipe, A method for adjusting the specific gravity of the slurry, wherein the specific gravity of the slurry is adjusted. The method for adjusting the specific gravity of slurry according to claim 1 , wherein the foam is supplied to the outer peripheral region and is supplied to the delivery port or the delivery pipe. The foam without supplying the housing area of the mixing agitator for mud fed to the mixing agitation outside, to claim 1, characterized in that provided in the outside of the housing of the mixing stirrer The method for adjusting the specific gravity of the slurry. The method according to claim 1 or 3 , wherein the foam is supplied to the delivery pipe without being supplied to the outer peripheral region. The method according to claim 1 or 2 , wherein the foam is further supplied to a central region in the casing. The method for adjusting the specific gravity of a slurry according to any one of claims 1 to 5 , wherein the slurry mixed with foam at the outer peripheral region, the delivery port or the delivery pipe is supplied to a central region of the gypsum board base paper. . The high specific gravity slurry in the state before the foam is mixed is separated, and the gypsum board edge core material, the gypsum board base paper adhesive surface coating material, or the gypsum board core surface material or The method according to any one of claims 1 to 6 , wherein the coating material is supplied to a predetermined part of a gypsum board production line. A kneading material and kneading water are supplied to a mixing stirrer having a rotating disk that is driven to rotate in a circular enclosure, and the gypsum mud that has been substantially mixed is retained in the outer peripheral region of the casing of the mixing stirrer. The present invention is applied to a gypsum board manufacturing process in which the slurry is continuously fed out of the machine from a delivery port, and the slurry is continuously supplied to a predetermined part of the gypsum board production line via a slurry delivery pipe communicating with the delivery port. A foam amount control method,
An annular partition wall that hangs down to the vicinity of the upper surface of the rotating disk is disposed on the upper lid of the circular casing, and the central region and the outer peripheral region are partitioned by the annular partition wall, and unmixed slurry and mixed slurry are separated. And
Supplying the kneading material and kneading water to the central area on the rotating disk, moving the rotating disk on the rotating disk to the outer peripheral area radially outward by the action of centrifugal force while stirring and mixing,
Supplying a predetermined amount of foam for mud adjustment from the outer peripheral region, the outlet or the delivery pipe to the slurry fed from the outer peripheral region via the delivery port and the delivery pipe, A foam amount control method, wherein foam is uniformly mixed in the slurry and defoaming is suppressed. The foam amount control method according to claim 8 , wherein the foam is supplied to the outer peripheral region and is supplied to the delivery port or the delivery pipe. The foam amount control method according to claim 8 or 9 , wherein foam for adjusting the slurry is further supplied to the central region in the casing. The foam without supplying the housing area of the mixing agitator for mud fed to the mixing agitation outside, to claim 8, characterized in that provided in the outside of the housing of the mixing stirrer The foam amount control method described. The foam amount control method according to claim 8 or 11 , wherein the foam is supplied to the delivery pipe without being supplied to the outer peripheral region.

Images