JP2014046558A - Production method for extrusion cement plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method for an extrusion cement plate having larger adhesion strength between a molded body and a core material, when producing an extrusion cement plate through extruding a hydraulic setting molding material.SOLUTION: When producing an extrusion cement plate 1 through extruding a hydraulic setting molding material 2, a core 15 having surface irregularity 7 is used and a molded body 4 having a hollow hole 3 with surface irregularity 8 formed thereon is extrusion-molded, and a hardening material 5 is injected into the hollow hole 3.

Description

  The present invention relates to a method for producing an extruded cement board that can be used for building materials and the like.

  Conventionally, an extruded cement board formed by extruding cement, plaster, or the like has been used for various building materials such as an outer wall or a partition wall of a building. Various extruded cement boards having a reinforcing material have been proposed for the purpose of improving the performance of the extruded cement board such as strength, fire resistance and heat insulation. For example, a molded body having a hollow hole is extruded and the foamed cement is supplied to the hollow hole to form a molded body filled with the foamed cement in the hollow hole. A method of obtaining is proposed (see, for example, Patent Document 1).

JP-A-61-92808

  FIG. 5 shows an example of the core mold 9 and the extruded cement plate 1 used for the extrusion molding of the extruded cement plate 1. 5A is a cross-sectional view of the core mold 9 in the width direction (a direction perpendicular to the extrusion direction), and FIGS. 5B to 5E are cross-sectional views of the extruded cement plate 1. FIG. 5 (b) and 5 (d) are cross-sectional views in the longitudinal direction of the extruded cement plate 1, and FIGS. 5 (c) and 5 (e) are cross-sectional views in the short direction.

  As shown in FIG. 5 (a), the core mold 9 used for extrusion molding of the extruded cement board 1 has a plurality of cores 15 connected by connecting portions 17, and each core 15 is connected to the front side of the drawing from the connecting portions 17. It has a shape protruding in the direction. In the molding machine, the core die 9 is provided inside a cylindrical base portion (not shown) opened in the extrusion direction. In producing the extruded cement plate 1, first, the hydraulic molding material 2 is fed from the connecting portion 17 side in the protruding direction (extrusion direction) of each core 15, extruded from the die portion, and the cross-sectional shape is the inside of the die portion. The formed body 4 is formed so as to conform to the cross-sectional shape of FIG. At this time, since the base portion includes the core 15 inside, the hollow 4 that matches the cross-sectional shape of the core 15 is formed in the molded body 4 along the extrusion direction at the same time. And the hardening material 5 is inject | poured into the hollow hole 3, the hardening body 5 is formed as the core material 6 by hardening the molded object 4 and the hardening material 5, and as shown in FIG.5 (b) and (c). Moreover, the extruded cement board 1 in which the core material 6 is provided in the hollow hole 3 can be manufactured.

  However, in the production of the conventional extruded cement board 1, when the hardened material 5 is injected into the hollow hole 3, the hardened material 5 cannot extrude the air existing in the hollow hole 3 or is encased in the hardened material 5. Air that is not present may be entrained and injected into the curable material 5. Then, as shown in FIGS. 5D and 5E, an air layer 16 is formed between the molded body 4 and the core material 6, and the adhesion strength between the molded body 4 and the core material 6 is reduced. There is. Further, the hydraulic molding material 2 and the curable material 5 are often required to have different functions, and may be composed of different compositions, resulting in different curing shrinkage rates, expansion rates due to heat or moisture, and the like. Then, when the hydraulic molding material 2 and the curing material 5 are simultaneously cured to form the molded body 4 and the core material 6, the molded body 4 and the core material 6 are different due to differences in the curing shrinkage rate and expansion coefficient of the material. There is a possibility that a part where adhesion is insufficient due to opening of a gap between the two and the adhesion strength may be reduced. As described above, when a portion in which the adhesion strength between the molded body 4 and the core material 6 is reduced in the extruded cement plate 1, the functions of the core material 6, for example, functions such as heat resistance and fire resistance can be obtained uniformly. There is a risk that it will not be possible. Moreover, there exists a possibility that the intensity | strength, weight, etc. of the extrusion cement board 1 may become non-uniform | heterogenous. Therefore, it becomes difficult to stably manufacture the extruded cement board 1.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a method for stably producing an extruded cement board having high adhesion strength between a molded body and a core material.

  The method for producing an extruded cement board according to the present invention is a molded article having a hollow hole having an uneven surface by using a core having an uneven surface when producing an extruded cement plate by extruding a hydraulic molding material. Is formed by extruding and injecting a curable material into the hollow hole.

  In the method for producing the extruded cement board, it is preferable that the hardened material is injected from the core into the hollow hole at the same time that the molded body is produced.

  In the method for producing the extruded cement board, the hardened material is preferably a bubble-containing cement in which bubbles are dispersed in a cement slurry.

  According to the present invention, it is possible to increase the surface area of a hollow hole by forming the unevenness on the surface of the hollow hole by extrusion molding using a core having an uneven surface. For this reason, the contact area between the molded body and the core material can be increased, and an extruded cement board having high adhesion between the molded body and the core material can be stably produced.

(A) is sectional drawing which shows the core type | mold used for an example of embodiment of the manufacturing method of an extrusion cement board, (b) is a cross section of the molded object manufactured using the core type | mold (a). It is a figure and (c) is a perspective view which shows an example of the extrusion cement board manufactured using the molded object of (b). It is the schematic which shows an example of the manufacturing method of an extrusion cement board. It is sectional drawing which shows an example of the manufacturing method of an extrusion cement board. (A)-(c) is sectional drawing which shows an example of the uneven | corrugated pattern of a core. (A) is sectional drawing which shows an example of the core type used for manufacture of the conventional extrusion cement board, (b)-(e) is a cross section which shows an example of the extrusion cement board obtained by the conventional method FIG.

  FIG. 1A is a cross-sectional view showing a core mold 9 used in an example of an embodiment of a method for producing an extruded cement board 1. FIG.1 (b) is sectional drawing of the transversal direction of the molded object 4 manufactured using the core type | mold 9 of Fig.1 (a), FIG.1 (c) is hollow of FIG.1 (b). It is a perspective view which shows an example of the extrusion cement board 1 manufactured by inject | pouring the hardening material 5 into the hole 3. FIG.

  In the method of manufacturing the extruded cement board 1, the hydraulic molding material 2 is extruded by using a core die 9 having a core 15 having irregularities 7 on the surface as shown in FIG. Then, as shown in FIG. 1B, a molded body 4 having a hollow hole 3 having irregularities 8 on the surface is formed. And as shown in FIG.1 (c), the hardening material 5 is inject | poured into this hollow hole 3, and the hardening material 5 is formed as the core material 6 by hardening the molded object 4 and the hardening material 5. As shown in FIG. In this way, by forming the irregularities 8 on the surface of the hollow hole 3 to increase the surface area of the hollow hole 3, the contact area between the molded body 4 and the core material 6 can be increased, and extrusion with high adhesion force is performed. The cement board 1 can be manufactured.

  As the hydraulic molding material 2, an appropriate cement-based molding material can be used. For example, the hydraulic molding material 2 contains cement, silica, reinforcing fibers, additives used as necessary, and water.

  As the cement, known cements such as Portland cement, blast furnace cement, and alumina cement can be used.

As silica, powder silica having a large specific surface area is preferably used. In this case, the toughness of the extruded cement plate 1 is improved. In particular, the specific surface area of silica is preferably 4000 cm ² / g or more. The proportion of silica in the hydraulic molding material 2 is preferably in the range of 20 to 120 parts by mass with respect to 100 parts by mass of cement. The intensity | strength of the extrusion cement board 1 improves that this ratio is 20 mass parts or more. Moreover, the extrusion moldability of the hydraulic molding material 2 will become favorable as this ratio is 120 mass parts or less.

  Examples of the reinforcing fibers include natural fibers such as pulp fibers, and synthetic fibers such as vinylon and polypropylene. Among these materials, only one kind may be used or two or more kinds may be used in combination. When pulp fibers are used, appropriate pulp fibers such as L-wood pulp, N-wood pulp, ramie pulp, and linter pulp can be used. The proportion of reinforcing fibers in the hydraulic molding material 2 is preferably in the range of 5 to 25 parts by mass with respect to 100 parts by mass of cement. When this proportion is 5 parts by mass or more, the strength of the extruded cement plate 1 is improved. Moreover, the extrusion moldability of the hydraulic molding material 2 will become favorable as this ratio is 25 mass parts or less.

  The hydraulic molding material 2 may contain additives other than those described above. Examples of such additives include thickeners such as methylcellulose, ethylcellulose, and carboxymethylcellulose; lightweight materials such as resin-based hollow bodies, shirasu balloons, and pearlite; and powders such as fly ash.

  The hydraulic molding material 2 can be prepared by, for example, dry-mixing the various materials described above, adding water, and kneading with a kneader. The proportion of water in the hydraulic molding material 2 is preferably in the range of 100 to 150 parts by mass with respect to 100 parts by mass of cement. For example, 100 parts by mass of cement, 100 parts by mass of silica, 5 parts by mass of reinforcing fibers (hardwood unbleached kraft pulp, LUKP), 2 parts by mass of a thickener, and 1 part by mass of a weight reducing material are dry-mixed, and water The hydraulic molding material 2 can be obtained by adding 150 parts by mass of and mixing.

  An appropriate cement-based molding material can be used for the curable material 5. For example, the curable material 5 contains cement, silica, reinforcing fibers, an additive used as necessary, and water. The types of cement, silica, and additives that can be used for the curable material 5 can be the same as those described above for the hydraulic molding material 2. For example, the hardening material 5 may be prepared by adding an additive (foaming agent, stabilizer, etc.) or water to the hydraulic molding material 2. The curable material 5 preferably has higher fluidity than the hydraulic molding material 2. As a result, the curable material 5 can be easily injected into the hollow hole 3, and the curable material 5 can easily push out the air in the hollow hole 3. It can suppress that it becomes small.

  The hardening material 5 is preferably a bubble-containing cement in which bubbles are dispersed in a cement slurry. Thereby, since the core material 6 can contain many bubbles derived from the curable material 5, the lightweight extruded cement board 1 with high heat resistance and fire resistance can be manufactured. The bubble-containing cement includes fine bubbles (air) in a cement slurry mainly composed of cement or the like. As a material constituting the cement slurry, for example, cement, silica, other additives used as necessary, and water are contained. The types of cement, silica, and additive that can be used for the cement slurry can be the same as those described for the hydraulic molding material 2 above. For example, the hydraulic molding material 2 may be adjusted by adding a liquid containing bubbles or a foaming agent or water.

  As a method for incorporating the bubbles into the cement slurry, a method of kneading a liquid containing bubbles and the cement slurry, or a method of adding a foaming agent to the cement slurry and incorporating the bubbles can be used. Examples of foaming agents include Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Ga, Sn, Si, ferrosilicon, and other metal powders, hydrogen peroxide, sodium peroxide, Examples thereof include peroxide powders such as potassium oxide and sodium perborate, surfactants, and amphiphilic compounds such as proteins. Further, if necessary, a foaming aid may be used in combination. Examples of the foaming aid include porous powders such as silica gel, zeolite, activated carbon, and alumina gel, metal stearate, and metal palmitate. Metal soap such as salt can be used. The amount of the foaming agent or foaming aid added may be appropriately set according to the type and viscosity of the slurry or the target bubble size. If the foaming agent or foaming aid as described above is added to the cement slurry and foamed to stir the cement slurry, bubbles can be generated and dispersed in the cement slurry. It is also possible to form bubbles using a commercially available homogenizer, mixing mill, ultrasonic irradiation device, etc. In this case, bubbles in the bubble-containing cement slurry are more easily formed.

  A method for manufacturing the extruded cement board 1 will be described in detail below with reference to the schematic diagram of the manufacturing method shown in FIG.

  The hydraulic molding material 2 is supplied into the extrusion machine 21 from a raw material input port 23 such as a hopper provided on one end side of the extrusion machine 21 and is kneaded by a screw 22 provided in the extrusion machine 21. . What is necessary is just to set suitably the rotational speed etc. of the screw 22 according to the kind etc. of material. The hydraulic molding material 2 reaches the base part 30 on the other end side of the extrusion molding machine 21 while being kneaded, and then is discharged from the base part 30 and extruded to the outside of the extrusion molding machine 21 to form the molded body 4. Formed as.

  In this embodiment, the curable material 5 is housed while being stirred by the stirrer 25 in the stirring tank 24 provided outside the extrusion molding machine 21, and supplied from the stirring tank 24 to the inside of the base part 30. The stirring tank 24 and the inside of the base part 30 are connected by a supply pipe 26 such as a pipe, and the hardening material 5 is directly supplied from the stirring tank 24 to the inside of the base part 30 through the supply pipe 26 by a metering pump or the like. It can be done. The curable material 5 supplied to the inside of the base part 30 is injected into the hollow hole 3 from the core mold 9 provided in the base part 30. Therefore, when the hardening material 5 is supplied to the inside of the base part 30, the inside of the hollow hole 3 of the molded body 4 is formed in parallel with the extrusion molding of the hydraulic molding material 2 to form the molded body 4. The curable material 5 can be injected into the container.

  In this way, the molded body 4 in which the curable material 5 is injected into the hollow hole 3 and discharged from the base part 30 is transported by a transport means 27 such as a transport conveyor arranged in parallel on the discharge side of the extrusion molding machine 21. The After the conveyance, the molded body 4 is loaded on the loading table 28. A desired size can be obtained by cutting the molded body 4 at a predetermined position before or after loading. And the extrusion cement board 1 can be manufactured by carrying out curing hardening of the molded object 4 which inject | poured the hardening material 5 in the hollow hole 3. FIG. As the extrusion molding machine 21, a known machine can be used.

  By the way, the curable material 5 can be directly injected into the hollow hole 3 using a metering pump or the like after the molded body 4 is formed in a certain size without being supplied to the inside of the base part 30. . That is, when extrusion molding is performed without supplying the curable material 5 to the inside of the base portion 30, a molded body 4 that does not have the curable material 5 is formed in the hollow hole 3. The curable material 5 can be injected with a pump or the like. For example, as indicated by a broken line arrow, the curing material 5 in the stirring tank 24 can be injected into the molded body 4 before curing and curing loaded on the loading table 28. In this way, the method of injecting the curing material 5 may be a method of injecting the curing material 5 into the molded body 4 after the extrusion molding and before curing and curing, or the hollow of the molded body 4 after curing and curing. A method of injecting the curable material 5 into the holes 3 may also be used. However, in the method of injecting these curable materials 5, it is preferable to inject the curable material 5 before curing and curing the molded body 4. By injecting the curing material 5 before curing and curing the molded body 4, the curing material 5 is injected into the hollow hole 3 in a state where the boundary surface between the hydraulic molding material 2 and the cured material 5 forming the molded body 4 is weak. can do. Thereby, the hydraulic molding material 2 and the curable material 5 can be partially mixed together, and the adhesion strength between the molded body 4 and the core material 6 can be increased.

  The method of injecting the curable material 5 is more preferably a method of injecting the curable material 5 from the core mold 9 into the hollow hole 3 at the same time that the molded body 4 is produced. As a result, the cured material 5 can be easily injected into the hollow hole 3 which has just been molded and the boundary surface of the hydraulic molding material 2 is weak, and the mixing of the hydraulic molding material 2 and the cured material 5 is further improved. The extrusion cement board 1 which becomes large and has a higher adhesion strength between the molded body 4 and the core material 6 can be easily manufactured. Further, when the curable material 5 is injected simultaneously with the molding of the molded body 4, the curable material 5 can be continuously injected while the molded body 4 is being extruded, so that the hollow holes 3 can be filled. It is possible to make it difficult for air to be mixed into the boundary portion with the air conditioner 4.

  FIG. 3 shows an example of the production of the extruded cement plate 1, and shows a cross-sectional view in the extrusion direction of the base part 30 and the core mold 9. The base portion 30 is formed in a cylindrical shape or a cylindrical shape, and a core die 9 having a core 15 is provided inside the base portion 30. The core mold 9 may have the form shown in FIG. An opening 10 serving as an outlet of the hydraulic molding material 2 is formed at one end of the base part 30. In FIG. 3, the form which inject | pours the hardening material 5 simultaneously with formation of the molded object 4 is shown.

  Since the extrusion molding machine 21 includes the die part 30, when the hydraulic molding material 2 is extrusion molded, the hydraulic molding material 2 passes through the die part 30 and passes through the opening 10 to the outside of the extrusion molding machine 21. The molded body 4 having a cross-sectional shape that matches the shape of the opening 10 is obtained. At this time, since the base part 30 includes the core mold 9 (core 15), the hydraulic molding material 2 passes through the periphery of the core 15 in the base part 30, and the molded body 4. In addition, the hollow hole 3 having a cross-sectional shape that matches the cross-sectional shape of the core 15 can be formed. That is, as shown in FIG. 1A, by using the core 15 having the unevenness 7 on the surface, the unevenness 7 is transferred, and the unevenness 8 is provided on the surface as shown in FIG. A molded body 4 having a hollow hole 3 can be formed.

  The inside of the base part 30 is formed so that the thickness is increased in the portion where the core mold 9 is provided, and the aperture 18 is provided in the vicinity of the opening 10 so that the thickness is reduced. By reducing the thickness in the vicinity of the opening 10, the hydraulic molding material 2 is pressed to be shaped, and the molded body 4 can be formed into a shape along the shape of the opening 10.

  The core mold 9 is provided inside the cylindrical base part 30. As shown in FIG. 1A, the core mold 9 is configured by connecting a plurality of cores 15 in a line along the width direction with a connecting portion 17. Each core 15 has a shape protruding from the connecting portion 17 in the extrusion direction. The core 15 has a columnar structure that falls sideways. It is preferable that the core 15 is connected to the connecting portion 17 in a line at equal intervals. Thereby, the hollow hole 3 can be formed in the molded object 4 at equal intervals, and the extrusion cement board 1 containing the hardening material 5 more uniformly can be manufactured.

  The connecting portion 17 is provided on the upstream side of the core 15 in the extrusion direction. The connecting portion 17 is fixed to the side portion of the base portion 30 at the end portion, and thereby the core mold 9 is supported and fixed in the base portion 30. The shape of the connecting portion 17 may be columnar or cylindrical. The thickness of the connecting portion 17 (length in the vertical direction) is thinner than the core 15. For this reason, even if the hydraulic molding material 2 passes through the base part 30 and is temporarily divided at the connecting part 17 in the base part 30, it is regrouped in the base part 30 to form the shape of the opening 10. A molded body 4 having a matching cross-sectional shape is obtained.

  The connection part 17 of this form can be made into the tubular structure where the inside became a cavity. Since the connecting portion 17 is connected to each core 15 with a tubular structure, the hardened material 5 can be easily supplied from the connecting portion 17 to each core 15, and the extruded cement board 1 can be efficiently manufactured. it can. For example, as shown in FIG. 2, when the curable material 5 is supplied from the agitation tank 24 to the core mold 9 through the supply pipe 26, the connecting portion 17 having a tubular structure and the supply pipe 26 are connected. Thus, the curable material 5 can be supplied from the stirring vessel 24 to the core 15 via the connecting portion 17.

  As shown in FIG. 3, the core 15 includes a base portion 11 supported by the connecting portion 17 and fixed in the base portion 30, a protruding portion 12 protruding from the base portion 11, and the base portion 11 and the protruding portion 12. And a core diaphragm 19 provided therebetween. The protruding portion 12 protrudes from the base portion 11 toward the opening 10. The projecting portion 12 is formed to have a smaller cross-sectional area than the base portion 11 and is narrower than the base portion 11 by a core diaphragm 19 that gradually becomes narrower in the extrusion direction. The base portion 11 is provided in a portion where the thickness inside the base portion 30 is increased, and the protruding portion 12 protrudes across the diaphragm 18 of the base portion 30. Accordingly, the shape of the molded body 4 can be adjusted by receiving a pressing force in the vicinity of the opening 10. The tip of the protruding portion 12 may be inside the opening 10 or outside the opening 10, but in order to obtain the molded body 4 in a good shape, it should be at the same position as the opening 10. preferable. The core diaphragm 19 is preferably provided so as to face the diaphragm 18 of the base part 30. Thereby, the hydraulic molding material 2 can be smoothly poured and extruded, and the extruded cement board 1 can be manufactured efficiently.

  As shown in FIG. 3, in this embodiment, a space 13 that communicates with the outside of the extrusion molding machine 21 is formed in the core 15, and a discharge that communicates with the space 13 is formed at the tip of the protruding portion 12. An outlet 14 is formed. Then, the curable material 5 is supplied from the stirring tank 24 to the space 13 via the connecting portion 17, and the curable material 5 supplied to the space 13 is discharged from the discharge port 14 of the protruding portion 12. In this way, the curable material 5 can be injected into the hollow holes 3 of the molded body 4 in parallel with the formation of the hollow holes 3 in the molded body 4. As a result, the molded body 4 discharged from the base part 30 is pushed out in a state in which the uncured material of the curable material 5 that can become the core material 6 is contained in the hollow hole 3. Thus, the extrusion cement board 1 can be manufactured efficiently.

  The number of cores 15 provided in the core mold 9 may be one or plural. The number of cores 15 matches the number of hollow holes 3 formed in the molded body 4. For example, when the core mold 9 having six cores 15 shown in FIG. 1 (a) is used, as shown in FIG. 1 (b), a molded body in which six hollow holes 3 are formed. 4 is obtained, and an extruded cement board 1 in which six cores 6 as shown in FIG. 1C are formed can be obtained. Since the cores 15 are provided along the width direction, the same number of hollow holes 3 as the number of cores 15 are formed along the width direction of the molded body 4.

  As shown in FIG. 1A, in this embodiment, the core 15 is provided with a concave portion 7a by forming the concave and convex portions 7 on the surface. When the hydraulic molding material 2 passes through the periphery of the core 15 in the base part 30 to form the hollow hole 3, the hydraulic molding material 2 enters the recess 7a and is pushed out in the invaded state. On the surface of 3, a ridge from which the hydraulic molding material 2 protrudes linearly is formed. In this way, as shown in FIG. 1B, the unevenness 7 is transferred, and the unevenness 8 having a shape matching the unevenness 7 is formed in the hollow hole 3.

  The recess 7a is preferably provided on the surface of the core 15 in a straight line along the extrusion direction. Thereby, when extruding the molded object 4, a material can be smoothly poured and extruded, and the unevenness | corrugation 8 can be formed in shape. Therefore, the core 15 may have the same cross-sectional shape in the extrusion direction including the unevenness 7 at an arbitrary position. The recess 7 a is preferably provided in a groove shape on the surface of the core 9. As a result, it is possible to efficiently increase the surface area by providing the concave and convex portions 8 in the hollow hole 3 with the groove-shaped concave portion 7a having a narrow width.

  Although the number of the recesses 7a may be one, it is preferable that a plurality of the recesses 7a be provided. Thereby, a plurality of uneven shapes can be provided on the surface of the hollow hole 3, the surface area of the hollow hole 3 can be increased, and the adhesion strength between the molded body 4 and the core material 6 can be increased. The plurality of recesses 7a preferably have substantially the same cross-sectional shape. Thereby, the uniform unevenness | corrugation 8 can be provided by the hollow hole 3, and the extrusion cement board 1 in which the adhesiveness of the molded object 4 and the core material 6 improved more uniformly can be manufactured. The plurality of recesses 7 a are preferably provided at equal intervals in the circumferential direction along the outer periphery of the core 15. Thereby, since the unevenness | corrugation 8 can be uniformly formed by the circumferential direction of the hollow hole 3, the extrusion cement board 1 in which the adhesiveness of the molded object 4 and the core material 6 improved more uniformly can be manufactured. The plurality of recesses 7 a have substantially the same cross-sectional shape, and are preferably provided at equal intervals in the circumferential direction along the outer periphery of the core 15. Thereby, the cross-sectional shape of the hollow hole 3 including the unevenness 8 can be made close to a symmetrical shape, and the extruded cement plate 1 in which the adhesion between the molded body 4 and the core material 6 is further increased uniformly can be manufactured.

  The length of the recess 7a in the extrusion direction may be shorter than the length of the core 15 in the extrusion direction, or may be provided with the same length as the length of the core 15 in the extrusion direction. When the length of the recess 7a in the extrusion direction is shorter than the length of the core 15 in the extrusion direction, the irregularities 7 can be easily formed in the core 15, and the irregularities 8 can be efficiently formed in the hollow holes 3 of the molded body 4. Can be provided. When the concave portion 7a having a length in the extrusion direction of the concave portion 7a shorter than the pushing direction of the core 15 is provided in a part of the core 15, for example, the concave portion 7a is provided only on the surface of the base portion 11, or It can be provided only on the surface. When the length of the concave portion 7a in the extrusion direction is the same as the length of the core 15 in the extrusion direction, the entire core 15 can stably provide the irregularities 8 in the hollow hole 3, and the molding The extruded cement board 1 having a high adhesion strength between the body 4 and the core material 6 can be stably produced.

  The irregularities 7 on the surface of the core 15 may be formed simultaneously with the molding of the core 15, or after the core 15 is molded, the irregularities 7 are provided on the surface by performing a cutting process, a welding process, a grooving process or the like. May be. Among these, it is preferable to form the irregularities 7 on the surface by forming grooves after forming the core 15. Thereby, the core 15 which has the unevenness | corrugation 7 on the surface can be obtained easily. Furthermore, it is preferable that the irregularities 7 are formed by providing the concave portions 7 a by streak-like groove processing in which a plurality of grooves are provided on the surface of the core 15. Thereby, the surface area of the hollow hole 3 can be further increased, and the extruded cement plate 1 having high adhesion strength between the molded body 4 and the core material 6 can be stably manufactured.

  The groove processing for providing the irregularities 7 on the surface of the core 15 can be performed by scraping the surface of the core 15 with a cutter or a mill. Thereby, the groove-shaped recessed part 7a which has arbitrary cross-sectional shapes can be formed easily. The core 15 is not limited to the concave portion 7a formed on the surface and has the irregularities 7 on the surface. Of course, the convex portion may be provided and the surface may have the irregularities 7 on the surface.

  The cross-sectional shape of the core 15 (excluding the irregularities 7) may be a polygonal shape such as a triangular shape or a rectangular shape, a circular shape or an elliptical shape, or an appropriate shape including a substantially polygonal shape. It may be. Among these, it is preferable that the cross-sectional shape (except the unevenness | corrugation 7) of the core 15 is circular. Thereby, the hardening material 5 can be smoothly poured into every corner of the unevenness 8 of the hollow hole 3, and the production efficiency of the extruded cement plate 1 having high adhesion strength between the molded body 4 and the core material 6 is improved. Can do. Further, in this case, since the outer periphery of the cross-sectional shape of the core 15 is a circumference, the unevenness 7 can be easily provided uniformly in the circumferential direction of the core 15, and the adhesion between the molded body 4 and the core material 6. It is possible to easily manufacture the extruded cement board 1 with a more uniform increase.

  When the curable material 5 is injected simultaneously with the molding of the molded body 4 as in the present embodiment, the curable material 5 is continuously filled into the hollow holes 3 along the irregularities 8 of the hollow holes 3 while extruding the molded body 4. Can do. For this reason, the curable material 5 can easily reach the corners of the irregularities 8 of the hollow holes 3 to make it difficult to mix air, and the cured material 5 blends well with the irregularities 8 of the hollow holes 3 to form the molded body 4. It is possible to stably produce an extruded cement plate 1 having high adhesion between the core material 6 and the core material 6. Further, when the fluidity of the curable material 5 is increased, the curable material 5 can easily enter the unevenness 8 of the hollow hole 3, and an uneven shape along the unevenness 8 of the hollow hole 3 can be easily formed in the core material 6. Thus, an extruded cement plate 1 having high adhesion between the molded body 4 and the core material 6 can be produced.

  Further, in the present embodiment, when the bubble-containing cement is used as the curable material 5, since the irregularities 8 are formed in the hollow holes 3 and the surface area is increased, the bubbles enter the boundary surface between the molded body 4 and the curable material 5. Even so, the adhesion area between the curable material 5 and the molded body 4 can be increased. Further, even when a plurality of bubbles enter the boundary surface, the bubbles can be blocked by unevenness, and the bubbles can be prevented from sticking to form an air layer. Therefore, it is possible to manufacture a weight-reduced extruded cement plate 1 having a high adhesion strength between the molded body 4 and the core material 6 and having high heat resistance and fire resistance.

  As described above, the molded body 4 into which the curable material 5 is injected is cut and cured in a direction perpendicular to the extrusion direction. In that case, in cutting | disconnection of the molded object 4, an appropriate cutting tool can be used in the range which does not change the cross-sectional shape of the hardening material 5 inject | poured along the unevenness | corrugation 8 of the hollow hole 3. FIG.

  Curing curing is performed under the condition that when the molded body 4 and the cured material 5 are cured at the same time, the difference in shrinkage rate or expansion coefficient between the hydraulic molding material 2 and the cured material 5 is small and the unevenness 8 is not crushed. preferable. Thereby, it can harden | cure with the hardening material 5 entering the hollow of the unevenness | corrugation 8, and the extrusion cement board 1 with high adhesiveness of the core material 6 and the molded object 4 can be formed. In this way, an extruded cement board 1 as shown in FIG. 1 (c) is obtained. In this extruded cement board 1, since the hardened material 5 is injected along the unevenness 8, the core material 6 has an unevenness that meshes with the molded body 4 on the surface, and the core material 6 and the molded body 4 are uneven. It is in close contact with each other. Therefore, it is possible to obtain an extruded cement plate 1 with high adhesion of the core material 6. In general, the extruded cement board 1 is formed in a long shape, and can be formed as a panel having the extrusion direction as the longitudinal direction and the width direction as the short direction. Of course, the extruded cement board 1 may have a length in the extrusion direction shorter than that in the width direction.

  By the way, also in the case where the molded body 4 having the hollow holes 3 is produced by extrusion molding and the curable material 5 is then injected into the hollow holes 3 of the molded body 4, in this embodiment, the hollow holes 3 are provided with irregularities 8. It has been. Thereby, the curable material 5 can be injected along the unevenness 8, the core material 6 and the molded body 4 are in close contact along the unevenness, and the adhesion strength between the core material 6 and the molded body 4 can be increased. .

  FIG. 4 is a cross-sectional view in the width direction (direction perpendicular to the extrusion direction) showing another example of the uneven pattern of the core 15. 4A shows a core 15 having a substantially circular cross-sectional shape, and FIGS. 4B and 4C are examples of the core 15 having a substantially rectangular cross-sectional shape. 4A, a triangular concave portion 7a is formed, in FIG. 4B, a trapezoidal concave portion 7a is formed, and in FIG. 4C, a triangular concave portion 7a is formed. Also in each form of FIG. 4, the unevenness | corrugation 7 of the core 15 is formed of the groove-shaped recessed part 7a. The cross-sectional shape of the concave portion 7a forming the concave / convex pattern of the core 15 may be a triangular shape with a point as shown in FIGS. 4 (a) and 4 (c), or as shown in FIG. 4 (b). The shape may be a trapezoidal shape that is tapered to a certain shape, or may be an appropriate shape such as a rectangular shape such as a rectangle or a square. Further, if the cross-sectional shape of the recess 7a is exemplified, not only a polygonal shape formed by a combination of straight lines as exemplified above, but also a shape formed by a curve such as a semicircular shape or an elliptical shape, And a shape obtained by a combination of curves. The recesses 7 a are preferably provided at equal intervals in the circumferential direction of the core 15. Thereby, the unevenness 8 can be formed more uniformly in the circumferential direction of the hollow hole 3. 4A to 4C, when the concave / convex pattern of each form is provided on the core 15 of the core mold 9, the molded body 4 and the core material 6 are formed in the same manner as in the form of FIGS. An extruded cement board 1 with improved adhesion can be produced more uniformly.

DESCRIPTION OF SYMBOLS 1 Extrusion cement board 2 Hydraulic molding material 3 Hollow hole 4 Molded object 5 Hardening material 6 Core material 7 Concavity and convexity 8 Concavity and convexity 9 Core type 15 Core 17 Connection part 21 Extrusion machine 30 Base part

Claims (3)

  In the production of an extruded cement board by extruding a hydraulic molding material, a molded body having hollow holes with irregularities on the surface is extruded using a core having irregularities on the surface, and a cured material is formed in the hollow holes. A method for producing an extruded cement board, characterized by being injected.   The method for producing an extruded cement board according to claim 1, wherein the hardened material is injected from the core into the hollow hole simultaneously with the formation of the molded body.   The method for producing an extruded cement board according to claim 1 or 2, wherein the hardening material is a bubble-containing cement in which bubbles are dispersed in a cement slurry.

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