JPH11268052A - Production of composite board for construction and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for efficiently producing a composite board for construction in a state with excellent quality in which foamed resin is filled in the gutterlike part of a front face material having a nearly gutterlike section and the back is covered with a backface material. SOLUTION: The composite board for construction is produced by discharging expandable resin liquid 7 into the gutterlike part 1a of a front face material 1 made which is continuously fed out and has a nearly gutterlike section and sending it into a resin expansion furnace 9 in such a state that the gutterlike part 1a is blocked by backing material 3 and foaming/curing the resin liquid 7. In this case, resin liquid 7 is discharged into the gutterlike part 1a of the front face material 1 while reciprocatively moving a discharge nozzle 5a in the width direction of the material 1, which discharges resin liquid 7 in a curtain shape at a wide angle from one point to the transfer direction of the material 1. Resin liquid 7 is made to uniform resin application thickness by blowing gas to resin liquid 7 through a gas nozzle 8 having a lengthwise elongated slit or a multiple perforated spout which is provided in the position before time starting foaming of discharged resin liquid 7 and installed in the upper part of the material 1 and opened on a horizontal line in the width direction of the material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin filled in a gutter-like portion formed on a metal surface material for forming an outer wall or an inner wall of a building or a structure. The present invention relates to a method for producing a building composite board having a back surface covered with a backing material, and an apparatus for manufacturing a building composite board suitable for carrying out this method.

[0002]

2. Description of the Related Art As a building exterior material for forming an outer wall or an inner wall of a building or a structure, a foam resin is filled in a gutter-like portion of a metal surface material formed in a gutter-like cross section. Architectural composite boards in which the back surface of this foamed resin is covered with a back material are widely used.

[0003] Such a composite board for a building usually has a fitting portion which bends both side edges in the width direction of a metal band serving as a surface material and which fits together to engage adjacent building composite boards at the time of construction. Is formed on the surface material having a substantially gutter-shaped cross section, and after the foamable resin liquid is discharged into the gutter-shaped portion of the surface material, the gutter-shaped portion is closed in the resin foaming furnace with the back surface material closed. It is manufactured by a method of foaming and curing a foamable resin liquid that has been fed and discharged.

Conventionally, in the above-described method, in order to discharge the foamable resin liquid into the gutter-like portion of the surface material, a plurality of discharge nozzles are arranged at appropriate intervals in the width direction of the surface material, and are transferred. That is, a plurality of lines parallel to the longitudinal direction were discharged into the gutter-shaped portion of the surface material.

[0005] However, when the foaming resin liquid is foamed and cured by closing the gutter-like portion of the surface material from which the foaming resin liquid has been discharged with the back surface material, the foaming resin is dispersed in the gutter-like portion of the surface material. It could not be filled in a uniform state.

That is, when the foamable resin liquid is discharged into the gutter-like portion in a plurality of lines, a portion where the foamable resin liquid before foaming exists and a portion where it does not exist coexist. The density (expansion ratio) of the foamed resin becomes uneven,
Furthermore, an unfilled portion (void) that is not filled with the foaming resin may be formed on the back side of the back material, and since this portion is hollow, the back material does not have a flat shape and irregularities are generated, and the appearance is reduced. In particular, when kraft paper, paper laminated with aluminum foil, or the like is used as the backing material, the back surface material has noticeably unevenness.

Therefore, it is necessary that the foaming resin liquid discharged into the gutter-like portion of the surface material when the foaming resin liquid is sent into the resin foaming furnace and foamed and cured has a uniform resin coating thickness. is there.

Therefore, in order to make the discharged foamable resin liquid a uniform resin coating thickness, for example, Japanese Patent Application Laid-Open No. 54-3165 / 1979.
No. 9 or JP-A-8-20033, the inside of the gutter-like portion is so sprayed that the foamable resin liquid discharged into the gutter-like portion of the surface material is applied to the entire surface of the gutter-like portion of the surface material. A method of spraying a gas to the foamable resin liquid has been proposed.

However, any of these methods is a method in which a gas is blown onto the foamable resin liquid discharged linearly into the gutter-like portion of the surface material, and the foamable resin liquid has a relatively high viscosity and a low fluidity. Therefore, even when the gas is blown, a difference occurs in the thickness of the foaming resin liquid between the part where the foaming resin liquid is discharged and the part where the foaming resin liquid is not discharged. When the foamable resin liquid is foamed and cured by closing with a material, the density (expansion ratio) of the foamed resin becomes non-uniform, and further, the unfilled portion (void) in which the foamable resin is not filled on the back side of the backing material. May occur,
This has the disadvantage that the backside material becomes uneven, or a void is generated between the backside material and the foamed resin to form a concave portion on the backside material, thereby lowering the product value.

As a method of making the thickness of the coating film of the foaming resin liquid discharged into the gutter-shaped portion of the surface material uniform, a method of blowing a gas to the foaming resin liquid discharged into the gutter-shaped portion of the surface material is described. In addition, as the discharge nozzle for discharging the foamable resin liquid, a nozzle having a slit-shaped nozzle formed in a longitudinal direction is used, and the slit-shaped nozzle of the discharge nozzle is inclined in the horizontal direction with respect to the transfer direction of the surface material. Japanese Patent Application Laid-Open No. 9-155888 discloses a method of disposing a foamable resin liquid while disposing the foamable resin liquid in a horizontal direction perpendicular to the direction of transport of the surface material.

However, the discharge nozzle used in this method, which has a slit formed in the form of a long slit, has a long distance from the supply pipe of the foamable resin liquid to the end of the slit in the longitudinal direction. Since the foamable resin liquid stays in the nozzle before the foamable resin liquid reaches the longitudinal end of the slit-shaped nozzle, a reaction product is generated without the foamable resin liquid being immediately discharged from the slit-shaped nozzle. In addition, since foaming starts before reaching the longitudinal end of the slit-shaped nozzle, the slit-shaped nozzle is easily clogged, and it is difficult to continuously operate for a long time.

That is, a foamed resin such as urethane foam, nurate foam, phenol foam or the like is filled between the front surface material and the back surface material. A raw material for forming the foamed resin, that is, a foamable resin is used. The liquid is usually used by mixing two or three kinds of liquid raw materials (for example, when the foamed resin is urethane foam, three kinds of liquids of an isocyanate raw material liquid, a polyol raw material liquid, and a catalyst raw material liquid are used). A mixed foamable resin liquid is used). When each liquid raw material is mixed to form a foamable resin liquid, a reaction starts immediately between the raw material liquids. Therefore, each liquid raw material is mixed immediately before the discharge nozzle. -ing Therefore,
When the discharge nozzle having the slit-shaped nozzle is used, a reaction product is generated or foaming starts before the foamable resin liquid is discharged from the slit-shaped nozzle, and the slit-shaped nozzle is clogged. This is disadvantageous in that it is difficult to continuously operate for a long time because it is easy.

[0013]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned disadvantages of the prior art and provides a gutter-like portion formed on a metal surface material for forming an outer wall or an inner wall of a building or a structure. The building composite board filled with foam resin and covered with the back material of the foam resin is foamed into a state in which the foam resin has a uniform density and no voids.
A method of manufacturing a composite board for building, which can be manufactured with high quality value and high yield by hardening, and in which clogging of a discharge nozzle hardly occurs and continuous operation can be performed for a long time, and this method It is an object of the present invention to provide an apparatus for manufacturing a composite board for building suitable for implementing the method.

[0014]

Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above-mentioned problems, and as a result, foams have been formed in a trough-like portion of a metal surface material which has been formed into a substantially trough-like cross section and is continuously fed. When the foamable resin liquid is discharged and sent into a resin foaming furnace in a state where the gutter-shaped portion is closed with a backing material, the foamable resin liquid is foamed and cured to produce the building composite board. The foaming resin liquid is spread over the surface material while reciprocating in a direction perpendicular to the transport direction of the surface material while the discharge nozzle that spreads the resin liquid from one point in a wide angle direction in the surface material transfer direction and discharges the resin liquid in a wide angle curtain shape. And is placed above the surface material at a position before the cream time (foaming start time) of the foamable resin liquid, and on a horizontal line orthogonal to the transfer direction of the surface material. Equipped with a slit or a multi-hole spout When the gas is blown from the gas nozzle onto the foamable resin liquid to make the foamable resin liquid a uniform resin coating thickness, the foamable resin liquid can be reliably and uniformly spread over the entire surface of the gutter-like portion of the surface material. Completed the present invention by investigating that it is possible to produce a building composite board with excellent quality that can be formed to a coating thickness, the density of the foamed resin is uniform, and the back material is flat without voids. It was done.

When the foamable resin liquid is a polyurethane resin liquid having a relatively small viscosity, it is easier to spray a gas to make the foamable resin liquid a uniform resin coating thickness, and to spray the gas from a gas nozzle. It has also been found that if the gas is air or an inert gas, it can be formed into a uniform resin coating thickness without causing a chemical reaction with the foamable resin liquid.

Further, the method of the present invention is a roll forming method in which both side edges in the width direction of a metal strip to be continuously fed as a surface material are bent by roll forming to form a surface material having a substantially trough-shaped cross section. Machine, and a resin liquid discharge device including a discharge nozzle that spreads the foamable resin liquid in a gutter-shaped portion of the surface material from one point in the transfer direction of the surface material in a wide angle shape and discharges it in a wide angle curtain shape, and the discharge nozzle. A reciprocating mechanism for reciprocating in a direction perpendicular to the transfer direction of the surface material, and a position before the cream time (foaming start time) of the foamable resin liquid discharged from the discharge nozzle and installed above the surface material; It has a longitudinal slit or perforated point nozzle opening on a horizontal line perpendicular to the transfer direction of the surface material, and blows gas onto the foamable resin liquid to make the foamable resin liquid uniform resin. Shape to coating thickness For building use, comprising: a gas nozzle to be closed; and a resin foaming furnace disposed downstream of the gas nozzle and configured to foam and harden the foamable resin liquid in a state in which the trough-shaped portion of the surface material is closed with a back surface material. It was also found that the use of a composite plate manufacturing apparatus could facilitate the implementation.

In this construction composite board manufacturing apparatus, if the gas nozzle is provided with a control device capable of controlling the gas pressure, gas amount, and temperature to be blown, various foaming resin liquids having different properties such as viscosity and the like can be used. It is possible to easily set the optimal gas spraying conditions corresponding to the change in the discharge amount of the foamable resin liquid and the change in the temperature, and to easily form a uniform resin coating thickness for various foamable resin liquids. Was also determined.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a composite board for construction according to the present invention and an apparatus for manufacturing a composite board for building suitable for carrying out the method will be described in detail with reference to the drawings. FIG. 1 is a schematic explanatory view showing one embodiment of an apparatus for manufacturing a composite board for building according to the present invention suitable for carrying out the method for manufacturing a composite board for building according to the present invention, and FIG. FIG. 3 is an explanatory plan view of FIG. 2; FIG. 4 is a partial cross-sectional perspective view from the side of a discharge port showing the structure of a discharge nozzle in the apparatus of the present invention; FIG. 5 is a building manufactured by the method of the present invention. FIG. 1 is a perspective view showing one embodiment of a composite board for use as viewed from the front side.

In the drawings, reference numeral 1 denotes a metal surface material constituting a composite board for building manufactured by the method of the present invention, and male and female fitting portions 1b, 1b are provided on both side edges in the width direction. A gutter-like portion 1a having a part thereof and forming a gutter shape is formed.

Reference numeral 2 denotes a foamed resin made of a synthetic resin such as urethane foam, nurate foam, or phenol foam filled in the gutter-like portion 1a of the surface material 1. Reference numeral 3 denotes a foamed resin.
And a paper-based material such as a metal plate made of a painted metal plate, kraft paper, or paper laminated with aluminum foil.

In order to manufacture such a composite board for building,
First, the foamable resin liquid 7 is discharged into the trough-shaped portion 1a of the surface material 1 which is formed into a substantially trough-shaped cross section and continuously sent out. Here, the surface material 1 is obtained by moving the uncoiler 10 from the pinch roller 11.
The widthwise side edges of the metal strip 1 ′ which are continuously fed by the method are bent by roll forming so as to form a gutter shape having the male and female fitting parts 1 b, 1 b and a part thereof. It can be formed by a roll forming machine 4 used in a conventional apparatus for manufacturing a composite board for building in which a large number of rollers are arranged in tandem.

The foamable resin liquid 7 to be discharged into the gutter-like portion 1a of the surface material 1 formed by the roll forming machine 4 is obtained by mixing two or three types of liquid raw materials, and forming urethane foam,
Foaming resin 2 such as nurate foam and phenol foam
And is discharged in a wide-angle curtain shape from one point in a wide-angle manner in the transport direction of the surface material 1.

The resin liquid discharging device 5 for discharging the foamable resin liquid 7 is provided with a discharge nozzle 5a capable of discharging in a wide-angle curtain shape in the transfer direction of the surface material 1,
For example, as shown in FIG. 4, the front end is closed at a plane perpendicular to the central axis of the resin liquid supply pipe for supplying the expandable resin liquid 7, and the inside of the expandable resin liquid 7 is fed. The leading end of the hollow portion to be formed is formed as a substantially hemispherical concave surface having a center on the central axis, and a V-shape having a depth extending straight into the substantially hemispherical concave surface through the central axis on the closing plane. A discharge nozzle 5a having a discharge opening opened in an outer shape (shape on the major axis of the ellipse) of a human eye connecting arcs when viewed from the closed plane side by forming a groove in a shape of a circle.
When the foamable resin liquid 7 is used, the foamable resin liquid 7 can be discharged in a wide-angle curtain shape from one point in a wide angle only in one direction on a straight line.

As described above, the foamable resin liquid 7 is obtained by mixing two or three kinds of liquid raw materials immediately before the discharge nozzle 5a. Since the material is generated and foaming is started, the foamable resin liquid 7 is spread out in a wide-angle shape from one point in the transport direction of the surface material 1 and discharged in a wide-angle curtain shape, so that the foamable resin liquid 7 does not stay in the discharge nozzle 5a. The discharge nozzle can discharge and prevent the discharge nozzle 5a from clogging for a long time.
The continuous use time of 5a can be extended.

The resin liquid discharger 5 reciprocates in a direction perpendicular to the direction of transport of the surface material 1 so as to discharge the foamable resin liquid 7 over the entire surface of the gutter 1a of the surface material 1. The resin liquid ejection device 5 is provided with a reciprocating mechanism 6 for reciprocating as described above.

As the reciprocating mechanism 6, for example, a rack is formed on a guide member 6a which is laid in a direction perpendicular to the direction of transport of the surface material 1 above the surface material 1 to be transported. A pinion is provided in the resin liquid discharge device 5 to engage with the resin liquid discharge device 5, and limit switches for regulating the moving distance of the resin liquid discharge device 5 are provided at both ends of the guide member 6a. It is possible to show a structure in which the rotation direction of the pinion is reversed.

Next, it is located above the surface material 1 at a position before the cream time (foaming start time) of the discharged foamable resin liquid 7 and on a horizontal line orthogonal to the transport direction of the surface material 1. The foamable resin liquid 7 is supplied from a gas nozzle 8 having an open slit or a porous point injection port which opens on a horizontal line perpendicular to the transport direction of the surface material 1.
Is blown into the resin to make the foamable resin liquid 7 a uniform resin coating thickness.

The gas nozzle 8 is provided with a control device capable of controlling the pressure, amount and temperature of the gas to be blown, so that the foamable resin liquid 7 discharged onto the surface material 1 can be formed to a uniform resin coating thickness. It is preferable to be able to easily set optimal gas blowing conditions that can be performed.

That is, the foamable resin liquid 7 is used by mixing two or three kinds of liquid raw materials as described above, and may be made of urethane foam, nurate foam, phenol foam or the like depending on the use of the composite board for building. Since various foamed resins 2 are used, the viscosity of the foamable resin liquid 7 discharged to the surface material 1 is not always the same. Therefore, when the viscosity of the discharged foamable resin liquid 7 is high, When the gas amount is set high, and when the viscosity is low, the gas pressure and gas amount to be sprayed are set low, and the gas temperature is set according to the working environment, so that the foamable resin liquid 7 is uniformly applied to the resin. It can be formed thick. The gas blown from the gas nozzle 8 may be air or an inert gas, so that a uniform resin coating thickness can be formed without causing a chemical reaction with the foamable resin liquid 7.

The viscosity of the foamable resin liquid 7 is 2 Pa · s (2
It has been confirmed that the foamable resin liquid 7 discharged into the gutter-like portion 1a of the surface material 1 can be surely made to have a uniform resin coating thickness when the thickness is less than 000 cps).

Thereafter, the gutter-like portion 1a of the front surface material 1 is
The foamable resin liquid 7 is sent into the resin foaming furnace 9 in a state where the foaming resin liquid 7 is closed and foamed and hardened. As the resin foaming furnace 9, the one used in a conventional apparatus for manufacturing a composite board for building can be used. For example, a conveyor contacting the surface material 1 and a conveyor contacting the backing material 3 in the heating furnace 9 a. A double conveyer 9b is installed, which is provided with the following. When the foaming resin liquid 7 is foamed, the front and back materials 1 and 3 are foamed while being sandwiched, thereby preventing the back material 3 from rising and uniforming the composite board for construction. What can be molded to a suitable thickness is shown.

After the foamable resin liquid 7 is foamed and cured in this manner, it is cut into a predetermined length to produce a composite board for building.

[0033]

EXAMPLE 1 Using a device of the present invention shown in FIG.
A surface material 1 having a gutter-like portion 1a having fitting portions 1b, 1b having a height of 35 mm formed on both side edges of a flat plate portion of 0 mm is continuously roll-formed, and the surface material 1 is subjected to a speed of 15 m / min. A discharge nozzle having a structure shown in FIG. 4 which is installed at a height of 100 mm from the flat plate portion so as to discharge the surface material 1 in a range of 300 mm on the flat plate portion in the gutter-like portion 1a while passing through the plate. 0.02m ³ / m from 5a
The foaming resin liquid 7 was discharged while the discharge nozzle 5a was reciprocated on the surface material 1 at a speed of 60 m / min. in a direction perpendicular to the transport direction of the surface material 1 at a discharge amount of in. Here, the foamable resin liquid 7 has a temperature of 25 ° C. and a viscosity of 1 Pa ·
s foamable urethane resin was used.

Thereafter, 300 m downstream from the discharge nozzle 5a.
A slit-shaped spout having a height of 150 mm and a length of 600 mm from the flat part of the surface material 1 is placed at a position m apart from the flat portion of the surface material 1.
The pressure is about 4100 Pa (418 mmAq) and the flow rate is 8.0 m from the gas nozzle 8 arranged at right angles to the transfer direction of the foaming resin liquid 7 in a direction in which the ejection angle is 10 degrees upstream of the vertical in the transfer direction. Air was blown under the conditions of ³ / min. And a temperature of 25 ° C.

Then, the gutter-like portion 1a of the surface material 1 coated with the foamable resin liquid 7 is closed in the back material 3 made of paper laminated with aluminum foil, and then sent into the resin foaming furnace 9 to foam. The composite resin sheet 7 was foamed and cured to produce a composite board for building.

As a result, the continuous use time until the discharge nozzle 5a is replaced by the nozzle clogging of the discharge nozzle 5a is reduced by one.
It took 12 minutes. In addition, the backing material 3 could be formed into a flat shape with no irregularities, and a composite board for building with good yield and excellent quality could be efficiently manufactured.

COMPARATIVE EXAMPLE 1 In Example 1, instead of the discharge nozzle 5a, a discharge nozzle in which 12 discharge ports having a diameter of 3 mm were formed at intervals of 50 mm was used, and the discharge ports were perpendicular to the surface material transfer direction. A composite board for construction was manufactured under the same conditions, except that the foaming resin liquid was discharged in a state where the discharge nozzles were fixed and the discharge nozzles were fixed in position.

As a result, the continuous use time until the discharge nozzle is clogged and the discharge nozzle is replaced is very short at 18 minutes, and the line must be frequently stopped, so that the production efficiency is extremely high. It was bad. Further, irregularities were generated on the back material due to voids generated between the foamed resin and the back material, and the quality and yield were reduced and the production efficiency was reduced as compared with Example 1.

Comparative Example 2 In Example 1, instead of the discharge nozzle 5a, a discharge nozzle provided with a slit having a width of 1.5 mm and a length of 300 mm was installed in such a manner that the longitudinal direction of the slit was parallel to the transfer direction of the surface material. Discharge nozzle 60m in the direction perpendicular to the surface material transfer direction
A composite board for building was manufactured under the same conditions except that the foamable resin liquid was discharged while reciprocating on the surface material at a speed of / min.

As a result, the continuous use time until the discharge nozzle is clogged and the discharge nozzle is replaced is very short, 32 minutes, and the line must be frequently stopped, resulting in extremely high production efficiency. It was bad. Further, irregularities were generated on the back material due to voids generated between the foamed resin and the back material, and the quality and yield were reduced and the production efficiency was reduced as compared with Example 1.

[0041]

As described above in detail, when the method for manufacturing a composite board for building according to the present invention is carried out, the metal surface material which is formed into a substantially trough-shaped cross section and is continuously fed out is placed in the trough-like portion. Spread the foamable resin liquid from one point in a wide-angle shape in the surface material transfer direction and discharge it in a wide-angle curtain shape. Since the foaming resin liquid discharged from the discharge nozzle can be applied in a state where the difference in thickness is relatively small over the entire surface of the trough-shaped portion of the surface material, the liquid is discharged into the gutter-shaped portion. A longitudinal slit or a perforated point orifice that is installed at a position before the cream time (foaming start time) of the foamable resin liquid and above the surface material and opens on a horizontal line perpendicular to the transport direction of the surface material. Before the gas nozzle with Since the gas is blown onto the foaming resin liquid, it is possible to form the resin coating thickness securely and uniformly over the entire surface of the gutter-like portion of the surface material, and the density of the foaming resin is uniform and no voids are generated. An excellent architectural composite board having a flat back material and excellent quality can be manufactured with good yield.

When air or an inert gas is used as the gas blown from the gas nozzle, a chemical reaction of the foamable resin liquid caused by the blown gas does not occur. When the resin is molded, the density of the foamed resin is uniform and the generation of voids can be reliably prevented.

Since the discharge nozzle for discharging the foaming resin liquid is widened from one point in the direction of transport of the surface material and discharged in a wide-angle curtain shape, nozzle clogging is unlikely to occur and continuous discharge for a long time Since the operation can be performed, the foaming resin liquid can be discharged immediately without stagnation, the nozzle clogging is effectively prevented, the continuous operation can be performed for a long time, and the production efficiency is excellent. .

The gas pressure blown by the gas nozzle,
If a control device that can control the gas amount and temperature is provided, various foaming resin liquids with different properties such as viscosity, and the optimal gas blowing conditions corresponding to the change of the discharge amount of the foaming resin liquid and the temperature change It can be easily set, and various foamable resin liquids can be easily formed into a uniform resin coating thickness.

The method of manufacturing a composite board for a building according to the present invention having various effects as described above and an apparatus suitable for carrying out the method are of great industrial value.

[Brief description of the drawings]

FIG. 1 shows an apparatus for manufacturing a composite board for building according to the present invention suitable for carrying out the method for manufacturing a composite board for building according to the present invention.
It is a schematic explanatory view showing an example.

FIG. 2 is an enlarged explanatory view of a portion A in FIG. 1;

FIG. 3 is an explanatory plan view of FIG. 2;

FIG. 4 is a partial cross-sectional perspective view illustrating a shape of a discharge nozzle in the apparatus of the present invention, as viewed from a discharge port side.

FIG. 5 is a diagram showing a composite composite board 1 manufactured by the method of the present invention.
It is the perspective view seen from the surface side showing an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal surface material 1 'Metal strip 1a Gutter-like part 1b Fitting part 2 Foam resin 3 Back material 4 Roll forming machine 5 Fat liquid discharge device 5a Discharge nozzle 6 Reciprocating mechanism 6a Guide member 7 Foam resin liquid 8 Gas nozzle 9 Resin foaming furnace 9a Heating furnace 9b Double conveyor 10 Uncoiler 11 Pinch roller

Claims (5)

[Claims] 1. A foamable resin liquid (7) is discharged into a gutter-like portion (1a) of a metal surface material (1) which is formed into a substantially trough-shaped cross section and is continuously sent out. In the state where the portion (1a) is closed with the back material (3), it is fed into a resin foaming furnace (9) to foam and harden the foamable resin liquid (7) to produce a building composite board. A discharge nozzle (5a) which spreads the foamable resin liquid (7) from one point in a wide-angle direction in the transport direction of the surface material (1) and discharges it in a wide-angle curtain shape in a direction perpendicular to the transport direction of the surface material (1) While the foamable resin liquid (7) is reciprocated to the surface material.
It is discharged into the gutter-like portion (1a) of (1), and is set at a position before the cream time (foaming start time) of the foamable resin liquid (7) and above the surface material (1). A gas is blown onto the foamable resin liquid (7) from a gas nozzle (8) having a longitudinal slit or a perforated point orifice opening on a horizontal line perpendicular to the transfer direction of the surface material (1), thereby producing the foamable resin. Resin liquid (7)
The method for producing a composite board for building, characterized in that the resin coating has a uniform resin coating thickness. 2. The method according to claim 1, wherein the foamable resin liquid (7) is a polyurethane resin liquid. 3. The method according to claim 1, wherein the gas blown from the gas nozzle is air or an inert gas. 4. A widthwise side edge of a metal strip (1 '), which is a surface material (1) continuously fed, is bent by roll forming to form a surface material (1) having a substantially trough-shaped cross section. Roll forming machine (4), and a foamable resin liquid (7) is spread in a wide angle shape from one point in the transfer direction of the surface material (1) into the gutter-like portion (1a) of the surface material (1). A resin liquid discharge device (5) having a discharge nozzle (5a) for discharging in a liquid state,
A reciprocating mechanism (6) for reciprocating in a direction perpendicular to the transfer direction of (1), and a position before the foam time (foaming start time) of the foamable resin liquid (7) discharged from the discharge nozzle (5a). And is located above the surface material (1)
It has a longitudinal slit or perforated point nozzle opening on a horizontal line perpendicular to the transfer direction of (1), and gas is blown onto the foamable resin liquid (7) to discharge the foamable resin liquid (7). A gas nozzle (8) for forming a uniform resin coating thickness, and a gutter-like portion (1a) of the surface material (1), which is arranged downstream of the gas nozzle (8), is closed by a back material (3). A resin foaming furnace (9) for foaming and curing the foamable resin liquid (7) in the state
An apparatus for manufacturing a composite board for building, comprising: 5. The apparatus according to claim 4, wherein the gas nozzle is provided with a control device capable of controlling a gas pressure, a gas amount, and a temperature to be blown.