RU2667399C2 - Method and device for manufacturing gypsum plaster board - Google Patents

Abstract

FIELD: construction.SUBSTANCE: group of inventions relates to construction and can be used in the manufacture of gypsum plaster boards. This method for manufacturing a gypsum plaster board comprises the steps of: (a) providing a gypsum slurry at least on the first sheet, (b) after step (a), the first sheet with gypsum slurry is placed between two opposite rollers that grind at least a portion of the solids. Also, a device for manufacturing a gypsum plaster board and a system containing it are disclosed, as well as their use.EFFECT: technical result is to increase the production efficiency of gypsum plaster boards.21 cl, 5 dwg

Description

The invention relates to a method and device for the manufacture of gypsum plasterboard.

EP 0759840 B1 describes an apparatus and method for manufacturing a gypsum plasterboard including a gypsum core. In the method according to EP 0759840 B1, the gypsum slurry flows and is distributed along the first sheet, forming a gypsum core. Then, a second cover sheet is laid on the gypsum core. The second cover sheet is unwound from the feed roller and passes over the guide roller, which guides the cover sheet, levels the upper surface of the suspension and reduces the thickness of the suspension to the desired size. The coating device is installed in the area between the two tables and comprises a coating roller and a pinch roller adjacent to each other.

In principle, methods, for example, as in EP 0759840 B1 are suitable and suitable for the production of gypsum plasterboard. However, if the production of plasterboards contains particles of solid gypsum, the particles can tear the cover sheets (in particular paper sheets) and cause the production of gypsum plasterboards to stop. In particular, gypsum solids (large pieces) can advance into the equipment to form and tear the cover sheet (paper). As a result, the production process must be stopped to clean the equipment. Therefore, the known solutions for the production of gypsum plasterboards are expensive and not effective, in particular, in the case when solid particles of gypsum are involved in the process.

An object of the present invention is to propose a method and apparatus for the production of gypsum plasterboard in the case when solid particles are involved in the production process that are effective, which in particular allow avoiding production interruptions.

According to the invention, a method for producing gypsum plasterboard comprises the steps of:

(a) provide a gypsum slurry containing solid particles,

(b) applying a gypsum slurry to at least a first sheet,

(b) after step (a), a first sheet of gypsum slurry is moved between two (first and second) opposite rollers grinding at least a portion of the solid particles.

A key idea of the present invention is two opposing rollers that destroy at least the largest particles. In this way, it is possible to prevent the cover sheet (paper) from tearing and stopping the production process. This leads to a more efficient and less expensive gypsum plasterboard production process. Preferably, the first (cover) sheet is a paper sheet. However, other options are possible (for example, sheets of textile material or the like).

In a preferred embodiment, a gypsum slurry is placed between the first sheet and the second sheet (preferably prior to step (b)). In general, a gypsum slurry may form a (single) inner layer. However, it is possible to prepare several gypsum suspensions forming several layers of the core. In any case, the first and second sheets should form outer layers with one or more inner layers between them. The second sheet is preferably a paper sheet (or, alternatively, a sheet of textile material or the like). In particular, solid particles are destroyed after combining the first sheet, one or more inner layers and the second sheet. Ultimately, production efficiency is achieved and, in particular, the destruction of solid particles.

Preferably, at least one of the first and second roller is movable or movable to or from the (corresponding) opposite roller. In addition, it is preferable that the lower roller is fixed. Alternatively or in addition, the upper roller may be configured to move or be moved to or from the lower roller. Thus, the distance between the two rollers can be adjusted so that it is possible to make plasterboards with different thicknesses and / or different (initial) sizes of solid particles. This means that you can use the same equipment for different conditions, which increases the overall efficiency of the process.

In a preferred embodiment, two rollers are located in the layer-by-layer application zone (directly) in front of the stabilization zone. The term "layer-by-layer application zone" preferably means a region in the manufacturing zone in which the first (and optionally the second sheet) is combined with a gypsum slurry. The term "stabilization zone" preferably means a region in the manufacturing zone in which the combined layers (the first sheet, at least one gypsum slurry and optionally the second sheet) are stabilized (in particular, harden) without (significant) change in shape (in particular thickness) . Preferably, the two rollers are positioned so that the destruction of the solid particles occurs before they enter the stabilization zone, i.e. to achieve a (substantially) final thickness. Therefore, it is possible to effectively avoid that too large solid particles lead to damage to the (integumentary) sheets.

At least one of the two rollers may be driven by the movement of the first and / or second sheet. For example, a first roller can in principle be driven by a first (cover) sheet. The second roller (in principle) can be powered by a second (cover) sheet. This means that there is no need for opposite rollers to move the sheets. On the contrary, in the preferred embodiment, the two rollers are passive elements (as for the activation of their rotation) and are intended (only) to destroy the particles (and additionally to direct the cover sheets in some direction). Thus, the structure of the rollers can be very simple, which increases the efficiency of the method.

The first and / or second roller may have a diameter of at least 100 mm, preferably at least 150 mm, more preferably at least 170 mm. With this diameter, the grinding (destruction) of solid particles is very effective and reliable.

Preferably, the axis of rotation of the two rollers are located in the same (vertical) plane. In this case, grinding (destruction) of solid particles is very reliable and efficient.

The first roller can be combined with the first (lower) molding table. The term “molding table” preferably means an element that defines the (final) thickness (generally: shape) of gypsum plasterboards. Alternatively or in addition, the second roller may be combined with a second (upper) molding table. The portions of the first and / or second molding table on the roller entry side are preferably at an angle to each other. The sections of the first and / or second molding table on the exit side of the rollers may be parallel to each other. In particular, the inlet side of the two opposite rollers can form a funnel. This structure of the funnel brings one or two sheets together with the suspension in such a way that after passing through the combined layers of two opposite rollers, the specified thickness of the plasterboards is achieved. In particular, portions of the first and / or second molding table on the roller entry side may have an angle of at least 5%, more preferably at least 10% and / or less than 30%, more preferably less than 25% (with respect to to the horizontal plane). In one embodiment, the end portion of the funnel formed by the sections of the first and second table on the entry side under two opposite rollers is formed by two opposite rollers. For example, at least the last 6 mm layer-by-layer application is performed by two opposite rollers.

The sheet thickness of the final plasterboard may be less than 1.0 times, preferably less than 0.8 times, more preferably less than 0.7 times, greater than the diameter of the (largest) particles in the slurry. In general, the term “diameter” of the particles should preferably be understood as “sieve diameter”. The "sieve diameter" should preferably be determined by the minimum distance between two parallel sides of the virtual sieve through which the corresponding particles can easily pass (and the corresponding particles may not pass through the sieve with two parallel sides having a smaller distance). In the case of spherical particles, the diameter may be, for example, the diameter of the spheres. In the case of particles of cubic shape, the diameter is the length of the face of the cube.

Alternatively, the particle diameter can be calculated using the maximum diameter of the corresponding particles (determined by two points on the particle surface having a maximum distance between each other).

The minimum distance between the two rollers may be less than 1.0 times, preferably less than 0.8 times, more preferably less than 0.7 times, greater than the diameter of the largest particles in suspension.

The sheet thickness of the final plasterboard may be less than 18 mm, preferably less than 12 mm, more preferably less than 10 mm. In General, the present invention allows the manufacture of relatively thin plasterboard even when using gypsum slurry containing relatively large particles.

The minimum distance between the two rollers may be less than 20 mm, preferably less than 14 mm, more preferably less than 12 mm. In this way, large particles can be crushed efficiently.

At least one of the sheets, preferably a second (upper) sheet, is guided by a guide roller provided in addition to the two opposite rollers. More preferably, the guide roller is located at the inlet end of the second (upper) table. Guide rollers for moving the sheet in the manufacture of gypsum plasterboard are known (as such). However, combining a guide roller with one or two opposing rollers on the same side of the gypsum layer allows particles to be guided and pulled efficiently. Moreover, if the guide roller is located at the input end of the second (upper) table, the displacement of the corresponding sheet (paper sheet) is minimized.

As an independent aspect of the present invention, there is provided a device for manufacturing a gypsum plasterboard, in particular in accordance with the method described above, comprising at least a first molding table and two (first and second) opposing rollers for grinding at least a portion of the solid particles in the gypsum slurry applied to a sheet, in particular a paper sheet, wherein at least the first roller is combined with the first molding table. The (minimum) distance between the first and second rollers is preferably less than 20 mm, more preferably less than 15 mm. Both opposite rollers can be combined with the corresponding molding table. For example, the first roller may be combined with the first (lower) molding table. A second (upper) roller may be provided in the second (upper) molding table. Essentially, even thin plaster boards with gypsum slurry containing large particles (in their initial state) can be effectively and reliably manufactured. The term "minimum distance" preferably means the minimum distance if the distance itself is variable. In any case, the (minimum) distance between two opposite rollers can be more than 5 mm, preferably more than 8 mm.

At least one of the first and second roller may be movable or moved to or from the (corresponding) opposite roller. The maximum distance may be 0.5 times, preferably 2 times, the minimum distance. For example, the distance may vary between 5 mm and 30 mm, preferably 10 mm and 20 mm. The lower roller can be fixed. Alternatively or in addition, the upper roller may be movable or moved to or from another roller.

At least one of the two opposite rollers is configured to rotate freely so that it can be driven by the movement of the first and / or second sheet.

The first and / or second roller has a diameter of at least 100 mm, preferably at least 150 mm, more preferably at least 170 mm. The rotation axes of the two rollers are preferably located in the same (vertical) plane. The first roller can be combined with the first (lower) molding table. The second roller can be combined with the second (upper) molding table.

At least one guide roller may be provided in addition to two opposite rollers in order to guide at least the first sheet and / or the second sheet, and it is preferable that the guide roller is located at the input end of the second (upper) molding table.

As an independent aspect of the invention, there is provided a system comprising a device of the kind previously described and a gypsum slurry with solid particles. Preferably, the minimum distance between two opposite rollers is less than the diameter of the largest particles.

As an independent aspect of the present invention, the use of two opposite rollers and / or the use of a device of the previously described type and / or the use of a system of the previously described type for grinding particles in a gypsum slurry during the manufacturing process of gypsum plasterboards, in particular, in accordance with previously described.

The accompanying figures show embodiments and (additional) aspects of the invention.

FIG. 1: Schematic representation of the upper and lower molding table of a device for the production of plasterboards;

FIG. 2: Side view (partial cross section) FIG. one;

FIG. 3: Schematic representation of the upper and lower molding table with paper sheets and gypsum slurry;

FIG. 4: Installation in FIG. 3 after advancing gypsum slurry; and

FIG. 5: Installation in FIG. 4 after further advancement of the gypsum slurry.

FIG. 1 and 2 show an embodiment of a first (lower) molding table 10 and a second (lower) molding table 11 of a device for manufacturing gypsum plasterboards. The device may contain additional components (for example, mixers for gypsum slurry or vehicles, or means for cutting, etc., not shown in the figures). There are two (first 12 and second 13) opposite rollers. The first roller 12 is integrated with the first molding table 10. The second roller 13 is integrated with the second molding table 11. At the inlet end 14 of the second table 11, a guide roller 15 is provided. The guide roller 15 (see FIG. 3) guides the second (cover) sheet 16 of paper so that the second sheet 16 extends between the forming tables 10 and 11. The first sheet (paper) 17 moves along the first table 10 (see Fig. 3). Due to the movement of the sheets 16, 17, the rollers 12, 13 rotate, as shown by the arrows 18. The installation in FIG. 3 can be divided into a layer-by-layer application zone 19 and a stabilization zone 20. In the layer-by-layer application zone 19, a gypsum slurry 21 is located between and binds to the (cover) sheets 16, 17. The lower table 10 contains an inclined section 22. The inclined sections 22 and 23 together with the rollers 12, 13 form a funnel 24 so that the moving sheets 16, 17 came close to each other to form a gypsum plasterboard. On the exit side 25 from the two opposite rollers 12, 13, the opposite surfaces of the molding tables 10 and 11 are parallel to each other so that the thickness of the gypsum layer between the sheets is constant and it is possible to determine a gypsum plasterboard of finite thickness.

The gypsum slurry 21 contains solid particles, wherein (as an example) one solid particle 26 is shown.

As can be seen in FIG. 3, the solid particle 26 is still far from the two opposite rollers 12, 13. However, together with the movement of the gypsum slurry 21 in the direction of the two opposite rollers (Fig. 3 on the left), the particle 26 enters the space between the two opposite rollers. Since the diameter of the particle 26 is larger than the distance between the two opposite rollers, the particle is compressed by the two opposite rollers 12, 13 and eventually crushed (as shown in Fig. 5). As a result, the crushed particle does not interfere with the further process, for example, does not tear sheets 16, 17.

Both rollers 12, 13 can be fixed on the corresponding molding table 10, 11. The upper table 11 can be made with the possibility of movement in the vertical direction (together with the roller 13). Two rollers 12, 13 are located in the layer-by-layer application zone 19 (directly) in front of the stabilization zone 20. The diameter of the rollers may be (approximately) 150 mm (or may be larger). The rollers must be of sufficient strength in order to be able to destroy (crush) the particles. Therefore, the crushing force depends on the strength and geometry (in particular, the diameter). As you can see, both axes of rotation of the rollers are (exactly) in the same vertical plane and are parallel.

In general, the method and apparatus of the present invention are very effective when relatively thin plasterboards are required. The thinner the plasterboard, the more likely it is to stop production, since any large pieces (solid particles) cannot pass onto the molding table. In this regard, the solution according to the invention is simpler and more efficient than the known solutions (for example, optimizing the mixer, stopping the production and raising the table when the paper is installed by the sensor, the chemical composition in the mixer or the use of a sieve after the outlet pipe is connected to the mixer). The present method and device can reduce the size of any solid particles (large pieces) so that large pieces that are initially larger than the distance between the two (cover) sheets 16, 17 become smaller. Using two rollers you can create a very large crushing force.

Reference Numbers

10 first (lower) molding table

11 second (upper) molding table

12 first (lower) roller

13 second (upper) roller

14 input end

15 guide roller

16 second sheet

17 first sheet

18 arrow

19 layer application area

20 stabilization zone

21 gypsum slurry

22 inclined section

23 inclined section

24 funnel

25 exit side

26 particle

27 space.

Claims (28)

1. A method of manufacturing a gypsum plasterboard, containing stages in which: (a) providing a gypsum slurry (21) on at least a first sheet (17), in particular a paper sheet, (b) after step (a), the first sheet (17) with a gypsum slurry (21) is moved between two, first (12) and second (13) opposite rollers grinding at least part of the solid particles (26). 2. The method according to claim 1, characterized in that the gypsum slurry (21) is placed between the first sheet (17) and the second sheet (16), preferably, before step (b). 3. The method according to claim 1 or 2, characterized in that at least one of the first (12) and second (13) roller is made with the ability to move or be moved to or from the opposite roller, and it is preferable that the lower roller was fixed and / or wherein it is preferred that the upper roller is movable or movable to or from another roller. 4. The method according to claim 1 or 2, characterized in that the two rollers (12, 13) are located in the layer-by-layer deposition zone (19), preferably immediately before the stabilization zone (20). 5. The method according to claim 1 or 2, characterized in that at least one of the two rollers (12, 13) is driven by the movement of the first (17) and / or second (16) sheet. 6. The method according to claim 1 or 2, characterized in that the first (12) and / or second (13) roller has a diameter of at least 100 mm, preferably at least 150 mm, more preferably at least 170 mm 7. The method according to claim 1 or 2, characterized in that the axis of rotation of the two rollers (12, 13) are located in the same, in particular a vertical plane. 8. The method according to claim 1 or 2, characterized in that the first roller (12) is combined with the first, in particular lower molding table (10), and / or the second roller (13) is combined with the second, in particular the upper molding table (11), moreover, it is preferable that the sections of the first and / or second molding table on the entrance side under the rollers (12, 13) are angled to each other and / or that the sections of the first and / or second molding table on the exit side of the rollers (12, 13) were parallel to each other. 9. The method according to claim 1 or 2, characterized in that the sheet thickness of the final plasterboard is less than 1.0 times, preferably less than 0.8 times, more preferably less than 0.7 times, exceeds the diameter of the largest particles in suspension (21) and / or the sheet thickness of the final plasterboard is less than 18 mm, preferably less than 12 mm, more preferably less than 10 mm. 10. The method according to claim 1 or 2, characterized in that the minimum distance between the two rollers is less than 1.0 times, preferably less than 0.8 times, more preferably less than 0.7 times, exceeds the diameter of the largest particles in suspension (21) and / or the minimum distance between the two rollers is less than 20 mm, preferably less than 14 mm, more preferably less than 12 mm. 11. The method according to claim 1 or 2, characterized in that at least one of the sheets (16, 17), preferably the top sheet (16) is guided by a guide roller (15), provided in addition to two opposite rollers (12, 13), and preferably, the guide roller (15) is located at the inlet end of the second (upper) table (11). 12. A device for the manufacture of gypsum plasterboard, in particular, in accordance with the method according to one of the preceding paragraphs, containing at least a first molding table (10) and two, the first (12) and second (13), opposite the grinding roller for grinding at least a portion of the solid particles (26) in the gypsum slurry (21) applied to the first sheet (17), in particular a paper sheet, wherein at least the first roller (12) is combined with the first molding table (10). 13. The device according to p. 12, characterized in that at least one of the first (12) and second (13) roller is movable or moved to or from the opposite roller, and it is preferable that the lower roller was fixed and / or and it is preferable that the upper roller was made to move or moved to or from another roller. 14. The device according to item 12 or 13, characterized in that the two rollers (12, 13) are located in the layer-by-layer deposition zone (19), preferably immediately before the stabilization zone (20). 15. The device according to item 12 or 13, characterized in that at least one of the two rollers (12, 13) is configured to rotate freely so that it can be driven by the movement of the first (17) and / or second (16 ) sheet. 16. The device according to item 12 or 13, characterized in that the first (12) and / or second (13) roller has a diameter of at least 100 mm, preferably at least 150 mm, more preferably at least 170 mm 17. The device according to item 12 or 13, characterized in that the axis of rotation of the two rollers (12, 13) are located in the same, in particular a vertical plane. 18. The device according to item 12 or 13, characterized in that the first roller (12) is combined with the first, in particular lower molding table (10), moreover, the second roller (13) is combined with the second, in particular the upper molding table (11). 19. The device according to item 12 or 13, characterized in that in addition to the two opposite rollers (12, 13), at least one guide roller (15) is provided in order to guide at least the first sheet (17) and / or a second (16) sheet, and it is preferable that the guide roller (15) is located at the inlet end of the second, in particular upper forming table (11). 20. A system comprising a device according to one of paragraphs. 12-19 and gypsum slurry (21) with solid particles (26), and it is preferable that the minimum distance between two opposite rollers (12, 13) is less than the diameter of the largest particles (26). 21. The use of two opposite rollers (12, 13) and / or the use of the device according to one of claims 12-19 and / or the use of the system according to claim 20, for grinding particles in a gypsum slurry, in particular, during the manufacturing process of gypsum plaster plates, preferably in accordance with one of claims 1 to 11.

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