JP3205654B2 - Laminated panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has complete non-combustibility and excellent fire resistance, is lightweight and high-strength, and is a core material of building materials such as fire doors, fire-resistant panels, oven walls of dryers, etc. And a laminated panel preferably used as

[0002]

2. Description of the Related Art Conventionally, for a core material of a building material such as a door, a partition, an outer wall, etc., a laminated panel comprising a honeycomb-shaped core and a thin plate-shaped skin covering both surfaces thereof for the purpose of weight reduction, That is, sandwich panels are widely used.

In such a laminated panel, a core is formed from a paper material such as kraft paper, and a metal plate such as a thin iron plate is used as a skin, and these cores and the skin are bonded with an adhesive such as a phenol resin. What is done is common. This laminated panel has the advantages of being inexpensive, easy to handle, and relatively strong. However, since the core material is pulp, it has a disadvantage that it is easily burnt, and there is a problem that it is unsuitable for a place where fire resistance and fire resistance are required.

For this reason, various means for making such a laminated panel flame-retardant and improving its fire resistance have been conventionally developed and proposed. One well-known method is
This is to fill a core such as a honeycomb structure with an inorganic filler. According to this, sound insulation, heat insulation, mechanical strength, and the like can be improved. On the other hand, the use of flame-retardant paper made from a mixture of aluminum hydroxide and pulp as a material for forming the core is also disclosed in, for example, JP-A-60-2.
Japanese Patent Laid-Open No. 50945, Japanese Patent Application Laid-Open No. 63-178033, and the like.

Further, for example, Japanese Patent Application Laid-Open No. 2-57329
In the publication, while forming a honeycomb-shaped core from a material obtained by coating sodium silicate on such flame-retardant paper,
A laminated panel is disclosed in which a core is filled with an inorganic filler containing sodium silicate as a binder, and a metal plate is bonded to both surfaces of the core with an adhesive made of sodium silicate.

[0006]

However, these prior arts relating to laminated panels, while certainly achieving the purpose of flame retardancy, are still inadequate in terms of nonflammability and high temperature durability. there were. That is,
Pulp core materials are flammable, and resin binders such as phenolic resins used as a binder for the core filler or as an adhesive between the core and the skin burn or thermally decompose at high temperatures. In this regard, in the prior art disclosed in Japanese Patent Application Laid-Open No. 2-57329, non-combustible sodium silicate, that is, water glass is used as a binder and an adhesive, and flame-retardant paper is used as a core material. Have been. However, even in this case, since the flame retardant paper contains about 30% of pulp for improving the bending strength, there is a problem that it is thermally decomposed at high temperature and loses its shape retention.

[0007] Another important problem of these conventional laminated panels is that the bonding property between the core and the skin is relatively weak because the core and the skin are simply bonded by an adhesive. is there. And this weak bonding often caused peeling of the epidermis and waving.

Further, recently, the demand for aesthetics has been particularly increased, and there have been cases where an inorganic material such as marble or inorganic cloth is used as a surface material applied to the surface of a core material of a laminated panel for decoration. More. For this reason, there has been a problem that a metal plate which has been generally used as a skin of a conventional laminated panel has poor compatibility with these inorganic materials. Further, since these inorganic materials are adhered to the surface of the laminated panel by bonding, high smoothness of the surface of the laminated panel has also become an important problem.

The present inventors have found that the core and the skin are composed of non-combustible paper containing sepiolite as a main component, and that the core and the skin are basically connected by an inorganic filler layer. A new laminated panel that advantageously solves this problem has been developed.

[0010] Accordingly, an object of the present invention is to provide a laminated panel which is excellent in fire resistance and fire resistance, and is also excellent in bonding between a core and a skin, surface smoothness, and the like.

[0011]

According to the present invention, there is provided a laminated panel comprising:
A core formed of non-combustible paper containing sepiolite as a main component, a pair of skins covering both sides of the core made of non-combustible paper containing sepiolite as a main component, and an inorganic filler and an inorganic binder. And a filling layer integrally formed on the surface of the core and burying the front end portions of both surfaces of the core to integrally connect each skin and the core.

Thus, in the present invention, the core and the skin are made of noncombustible paper containing sepiolite as a main component. This sepiolite is a clay mineral commonly called mountain leather (mountain skin), mountain cork, or mountain wood, and sepiolite in Japan is also a kind thereof. The appearance may be cork-like, leather-like, or a white soft mass, but is generally a fibrous magnesium silicate mass. The surface has a highly reactive hydroxyl group and has basic properties such as adsorptivity, thixotropy, and solidification.

The noncombustible paper used in the present invention is obtained by paper-making a slurry containing sepiolite as a main component, and is generally in the form of a thin sheet having a thickness of 0.3 to 0.5 mm. The non-combustible paper may be made of sepiolite alone, but preferably, inorganic fibers are added for reinforcement. Glass fibers, rock wool fibers, stainless steel fibers and the like can be used for this purpose, and are generally blended in a ratio of 5 to 20% by weight (based on the entire noncombustible paper). For the purpose of this reinforcement, organic fibers such as wood pulp or aramid fibers can also be used,
Its content should be kept below 5% by weight,
Thereby, flame retardancy and sufficient shape retention after thermal decomposition are maintained. A thermosetting or thermoplastic synthetic resin or an inorganic binder such as water glass can be used as a binder for improving the binding property of the noncombustible paper.
However, since sepiolite is excellent in solidifying properties, even when a synthetic resin is used as a binder, the addition amount of 5% by weight or less is sufficient. And such an addition amount does not substantially affect nonflammability.

In the laminated panel of the present invention, this non-combustible paper can be used as it is as a skin, but in the case of a core, it is used after being formed into a predetermined shape or structure such as a honeycomb shape. In this case, for example, the honeycomb structure may be formed by providing an adhesive strip on the non-combustible paper at intervals and laminating a large number of sheets while shifting each other, then cutting this into a desired width, and then expanding the sheet itself. This can be done in any well-known manner. It is appropriate to use an inorganic adhesive as the adhesive, for example, a colloidal silica-based adhesive can be used. It is also desirable to impregnate or coat the entire core with an inorganic binder to increase physical strength. Water glass such as sodium silicate is suitable for the binder. The core structure is most commonly and preferably a honeycomb structure, but may be a corrugated core, a roll core, a feather core, or the like.

The skin and core made of these noncombustible papers are:
They are interconnected by a packing layer. That is, a filling layer is integrally formed on the inner surface of each skin, and the front end portions of both surfaces of the core are joined together while being embedded in the filling layer. In this way, the core and the respective skins are mutually connected via the filling layer. The filling layer is formed on the inner surface of each skin as a relatively thick coating, and fills the inside of the laminated panel. Therefore, in addition to bonding the core and the skin, the filling layer provides the laminated panel with high strength and low thermal conductivity. Therefore, this filling layer, as an inorganic molded body of an inorganic filler and an inorganic binder,
It is formed from the aqueous composition.

As the inorganic filler, any of inorganic powder materials generally used in this field can be used. For example, perlite powder, mica powder, silica,
Calcium silicate, talc, silicalite, aluminum hydroxide powder, and the like. However, in that it is lightweight,
Among these, inorganic foams or hollow bodies such as pearlite powder, calcined vermiculite, shirasu balloon, silica balloon and the like are more preferable. The most preferred of these is a shirasu balloon. This shirasu balloon is not only extremely low in specific gravity but also particularly excellent in heat resistance and the like.

Further, it is preferable that the inorganic filler of the filling layer contains fibers for reinforcement. Such fibers are rock wool, alumina fibers, silica fibers, titanium fibers, carbide fibers such as silicon carbide, glass fibers, or whiskers. Among these, glass fibers are preferred in that they are inexpensive. Further, metal fibers such as steel or organic fibers such as aramid fibers can be used as necessary. However, they should be used to a minimum in thermal insulation or fire resistance.

The inorganic binder, which is a binder for the inorganic filler, may be hardened by a hydration reaction of Portland cement or masonry, but is hardened by forming an inorganic polymer such as water glass, phosphate and silica sol. Are preferred. However, most preferred is the water glass.

Water glass is an aqueous solution containing an alkali metal silicate as a main component. The alkali metal silicate is represented by a general formula M ₂ O · nSiO ₂ , where M is sodium Na, potassium K, or lithium Li, and is a molar ratio between M ₂ O and SiO _2. n is generally from 1.6 to 4.5. Examples of such an aqueous solution of an alkali metal silicate include sodium silicate water glass which is inexpensive and easily available as a JIS standard product.
It can be particularly preferably used. It is more preferable to use a mixture of the sodium silicate water glass and the lithium silicate water glass. Thereby, the water resistance after curing can be further increased.

It is appropriate to use a curing agent together with this water glass in order to shorten the curing time and to improve water insolubility and heat resistance. Various such curing agents have been known and used in the past. Typical examples are oxides of polyvalent metals such as zinc oxide, hydroxides of polyvalent metals such as calcium hydroxide, silicides such as calcium silicate, silicofluorides such as sodium silicofluoride, and borides. Borates such as potassium acid, phosphates such as aluminum phosphate, and mixed and baked products of phosphoric acid and metal oxides.

However, zinc borate is the most advantageous as such a hardening agent for water glass. This zinc borate has long been used as a flame retardant for paints and plastic molded articles, and is generally 2ZnO.3B ₂ O ₃
· 3.5 H is a hydrate represented by composition ₂ O. By using zinc borate as a curing agent for water glass, the curing (gelling) time can be easily controlled. For example, zinc borate is replaced with water glass 1
By adding 10 to 20 parts by weight to 00 parts by weight, the curing time of the water glass can be reduced from a short time of about 5 minutes to 1 time.
It can be adjusted arbitrarily within the range of time. In this case, the water glass composition containing the inorganic filler hardens and solidifies while containing water.

Incidentally, a foaming agent can be added to such an aqueous composition for forming the filling layer. However, in consideration of the possibility of uneven foaming, the use of a foaming agent should be avoided if possible. And, as mentioned above, the purpose of light weight is sufficiently achieved by using shirasu balloon as a main component as an inorganic filler and using water glass having zinc borate as a hardener as an inorganic binder. be able to.

In the laminated panel of the present invention, the thickness of the filling layer having such a composition depends on the desired strength,
It can be arbitrarily determined according to fire resistance, heat insulation, sound insulation and the like. However, the filling layer should have a sufficient thickness for the non-combustible paper forming the core since the core is bonded to the skin by being embedded in it. Therefore, the thickness of the filling layer is preferably at least five times the thickness of the non-combustible paper, and is generally 2 to 10 mm, depending on the total thickness of the laminated panel.

According to one embodiment of the laminated panel of the present invention, an inorganic cloth can be further interposed between the skin and the filling layer as a reinforcing layer. In this case, the filling layer is integrally formed on the inner surface of the skin through the reinforcing inorganic cloth. For this reason, as the reinforcing inorganic cloth as the reinforcing layer, one having a relatively coarse weave is used. In addition, the weave form of the inorganic cloth is arbitrary, but in order to obtain a uniform reinforcing effect, the inorganic fiber yarns are vertical,
It is preferable that it is in the form of crossing sideways. As such a reinforcing inorganic cloth, for example, a wire net-like plain woven cloth of glass fiber, which is generally used for this kind of reinforcing, can be suitably used.

According to another aspect of the laminated panel of the present invention, the skin can be made of reinforced noncombustible paper containing an inorganic cloth as a reinforcing layer between layers of noncombustible paper containing sepiolite as a main component. Here, the non-combustible paper containing sepiolite as a main component is as described above. And
As the reinforcing inorganic cloth, any material made of any material, woven form, or the like can be used, and the structure of the reinforced noncombustible paper including the reinforcing layer is, for example, completely bonded to each other by an adhesive. It can be a laminate in shape. However, a structure that is more preferable in terms of strength is a structure in which an inorganic cloth is integrally embedded in noncombustible paper. Such a structure is, for example, between two wet noncombustible papers immediately after papermaking. In addition, they can be obtained by integrating the inorganic cloth. For this reason, the reinforcing inorganic cloth preferably has a relatively coarse weave as in the case of the reinforcing inorganic cloth interposed between the skin and the filling layer. As such a woven fabric, a wire mesh-like plain woven fabric of glass fiber or the like can be suitably used.

In the production of the laminated panel of the present invention, an aqueous composition comprising an inorganic filler and an inorganic binder is applied to the surfaces of a pair of skins made of the noncombustible paper to form a thick filler layer, While the filling layer does not solidify, the leading ends of both sides of the core are embedded in the filling layer, respectively, and
In this state, the filling layer is solidified and dried. When the structure is such that an inorganic cloth is interposed between the skin and the filling layer as a reinforcing layer, the filling layer is formed in a state where the reinforcing inorganic cloth is overlaid on the surface of the skin. For the production of such laminated panels,
This will be described in more detail in a later embodiment.

[0027]

In the laminated panel of the present invention, the core and the skin are formed of non-combustible paper containing sepiolite as a main component, and the filling layer is formed of an inorganic filler and an inorganic binder. For this reason, since the laminated panel of the present invention is formed substantially as an inorganic molded article, it has excellent fire resistance and fire resistance.

The core and the skin are different from mere adhesion because the core and the skin are joined to the filling layer integrally formed inside each skin by embedding the tip portions on both sides of the core integrally. And has excellent binding properties. Further, the skin is supported and reinforced by a filling layer integrally formed on the inner surface, so that the surface can be held smooth.

Furthermore, since non-combustible paper containing sepiolite as a main component is used for the skin, it is well compatible with inorganic materials such as marble and inorganic cloth applied as a surface material, and a surface material such as a metal. Has excellent applicability since it has excellent surface smoothness.

Further, when a reinforcing inorganic cloth is interposed between the skin and the filling layer, or when the skin is formed as a laminate including the reinforcing inorganic cloth, the reinforcing action of the inorganic cloth causes The strength of the laminated panel, especially against bending, is further improved.

[0031]

Embodiments of the present invention will be described below.

<Embodiment 1> FIG. 1 is a sectional view of a laminated panel according to an embodiment of the present invention, and FIG. 2 is a partially cutaway view of the entire laminated panel. In these figures, 1 is a honeycomb core formed of non-combustible paper containing sepiolite as a main component, 2 is a skin made of non-combustible paper also containing sepiolite as a main component, and 3 is a filler made of inorganic filler and an inorganic binder. The filling layer 3 is integrally formed on the inner surface of each skin 2, and the front end portions of both surfaces of the honeycomb core 1 are bonded to each other while being embedded therein. Here, the honeycomb core 1 is formed as a honeycomb structure in which a number of columnar cells having a regular hexagonal cross section are formed by partition walls in the thickness direction.

In the laminated panel of this embodiment, the non-combustible paper used for the honeycomb core 1 and the pair of skins 2 covering both surfaces of the honeycomb core 1 is formed by papermaking from a slurry containing sepiolite as a main material. Having.

[0034]

[Table 1]

Here, the total amount of organic components such as pulp is
It is 5% by weight based on the whole. And this non-combustible paper is
Although the organic component is carbonized by high-temperature heating (800 to 1000 ° C.), the strength of the sheet after carbonization is small, and the sheet has sufficient heat-resistant shape retention. Further, the non-combustible paper does not redissolve even when immersed in water, and its strength is not significantly reduced. The non-combustible paper used in this embodiment has a thickness of about 0.4 mm.

The non-combustible paper was used as it was as the skin 2, but in the case of the honeycomb core 1, adhesive strips were provided at intervals on the non-combustible paper, and the positions of the adhesive strips were shifted by half a pitch from each other. After laminating and adhering a large number of sheets while shifting, they were cut into a width of about 3 cm, and expanded to form a honeycomb structured core. As the adhesive, an inorganic adhesive of colloidal silica using magnesium silicate as a curing agent was used. Also, by performing the above-mentioned expansion in a dipping container containing water glass,
The entire core was impregnated with water glass and then dried and solidified. As the water glass, sodium silicate 88
What consisted of 12% by weight of magnesium oxide (hardening agent) was used.

In the laminated panel of this example, the filling layer was formed from an aqueous composition having the following composition.

[0038]

[Table 2]

Here, sodium silicate JIS No. 3 is a water glass made of sodium silicate having a solid content of 38.5%. In addition, Shirasu balloon, Winlight MSB-302
(Manufactured by Ichi Kasei Co., Ltd.), which has a bulk density of 0.15
0.18, moisture 1% or less, average particle size 60 μm, softening start temperature 800 to 1000 ° C., melting point 1200 to 1300 ° C.,
It has a thermal conductivity of 0.05 to 0.06 Kcal / mhr ° C. Zinc borate is also used as a flame retardant in Alkanex
FR-100 (manufactured by Mizusawa Chemical Co., Ltd.), containing water of crystallization, having an average particle size of 2-3 μm, and a bulk specific gravity of 0.27 ± 0.05.

This composition for forming the filling layer is prepared by mixing sodium silicate JIS No. 3, shirasu balloon and glass fiber in advance, stirring at room temperature, and separately adding zinc borate dispersed in water immediately before use. The curing (gelling) time is about 30 minutes.

(Production of Laminated Panel) From these materials and compositions, the laminated panel of this example was produced as follows. This will be described together with the state diagram of the manufacturing process shown in FIG.

1) First, the skin 2 made of noncombustible paper is placed on an appropriate plane, and the above-mentioned aqueous composition is poured on the surface thereof to form a thick and uniform filling layer 3. This state is shown in FIG.

2) Next, as shown in FIG.
While the filling layer 3 is not cured (gelled), the honeycomb core 1 formed from the above-described non-combustible paper is placed on the filling layer 3, and the front end portion of one side of the honeycomb core 1 is embedded in the filling layer 3. Then, in this state, the filling layer 3 is cured and naturally or forcibly dried to form a laminated panel half body in which the skin 2 is bonded to one surface side of the honeycomb core 1 via the filling layer 3. The drying of the filling layer 3 at this stage is not always necessary as long as the filling layer 3 is sufficiently solidified and the honeycomb core 1 and the skin 2 are sufficiently bonded to each other.

3) Next, similarly to the first step, the filling layer 3 is formed on another skin 2 made of noncombustible paper. Then, the laminated panel half obtained in the second step is placed on the filling layer 3 while the filling layer 3 is not cured. This state is shown in FIG.

4) Then, as shown in FIG.
As in the second step, the tip portion of the other surface of the honeycomb core 1 is embedded in the filling layer 3, and in this state, the filling layer 3 is cured and naturally or forcibly dried.

In the second step and the fourth step, when the front end portions of both surfaces of the honeycomb core 1 are embedded in the filling layer 3, the front end of the front surface is closed as shown in FIGS. 3 (b) and 3 (d). 2 so as not to abut. this is,
This is to prevent the turtle's scallop pattern by the honeycomb core 1 from appearing on the outer surface of the skin 2. if,
When the tips of both side surfaces of the honeycomb core 1 are in contact with the skin 2, when the filling layer 3 is dried or the like, the turtle-like pattern may emerge on the surface of the skin. Therefore, in the second and fourth steps, an appropriate spacer is interposed between the honeycomb core 1 and the skin 2.

FIG. 1 and FIG. 2 are referred to again for the laminated panel manufactured in this manner. Then, a filling layer 3 is integrally formed on the inner surface of each skin 2, and the front end portions of both surfaces of the honeycomb core 1 are integrally embedded in the filling layer 3. As particularly shown in FIG. 1, the filling layer 3 is formed in a shape in which the central portion is slightly depressed in each cell of the honeycomb core 1 due to a slight shrinkage during drying. Further, as described above, the tip of the honeycomb core 1 is slightly separated from the skin 2.

As described above, the honeycomb core 1, the skin 2, and the filling layer 3 form a structure integrated with each other.
The filling layer 3 also functions as a beam for reinforcing the honeycomb core 1, and conversely, the honeycomb core 1 reinforces the brittleness of the filling layer 3 together with the skin 2. For this reason, this laminated panel forms a structure having extremely high mechanical strength.

The filling layer 3 is formed to be relatively thick, and in this embodiment is 4 to 5 mm (the thickness of the entire panel is about 3 cm). For this reason, the heat insulation or fire resistance is very high, and about 10%
The test was conducted by igniting a burner at 00 ° C., and showed no change in shape and no effect on the core.

Embodiment 2 FIG. 4 shows a cross section of a laminated panel according to another embodiment of the present invention.

This laminated panel is formed integrally with a honeycomb core 1 having a honeycomb structure, a skin 2 covering both surfaces of the honeycomb core 1, and an inner surface of each skin 2, similarly to the laminated panel of the first embodiment. The honeycomb core 1 is bonded to the filler layer 3 in a state where the front end portions of both surfaces of the honeycomb core 1 are buried. The honeycomb core 1, the skin 2, and the filling layer 3 are made of the same material and composition as in Example 1.

The laminated panel of this embodiment is the same as that of the first embodiment.
The difference is that the inorganic cloth 4 for reinforcement is further interposed between the skin 2 and the filling layer 3. Here, the inorganic cloth 4 is made of a plain woven fabric of glass fiber and has a wire mesh shape having a weave of about 4 mm. In a state where the woven fabric 4 is integrally embedded, the filling layer 3 is integrally formed on the inner surface of the skin 2 through the texture.

A laminated panel including such a reinforcing inorganic cloth 4 can be manufactured in the same manner as described in the first embodiment. That is, referring to FIG. 3 showing a method of manufacturing a laminated panel, at the stages (a) and (c), the filler layer 3 is placed in a state where the reinforcing inorganic cloth 4 is placed on the skin 2 in a superposed state. The composition to be formed is applied. Thereafter, the same is true. The tip of the honeycomb core 1 is immersed in the filling layer 3 while the filling layer 3 is not cured (gelled), and then the filling layer 3 is cured and dried. At this time, both surfaces of the honeycomb core 1 can be embedded until the front ends thereof come into contact with the inorganic cloth 4. This reinforcing inorganic cloth 4
By intervening, the turtle-like pattern of the honeycomb core 1 is effectively prevented from being raised on the surface of the epidermis 2. Therefore, in this case, the spacer used in the manufacture of the laminated panel of the first embodiment is unnecessary.

In the laminated panel of the present embodiment thus formed, the skin 2, the filling layer 3, and the reinforcing inorganic cloth 4 form an integral laminated structure. For this reason, the inorganic cloth 4 acts as a reinforcing layer, and the strength of the laminated panel, especially against bending, can be remarkably improved. Further, the brittleness of the filling layer 3 against perforations is reinforced by the reinforcing inorganic cloth 4, whereby the fixation of the surface decorative material by nailing can be facilitated. Furthermore, by using a fiber in which fiber yarns such as plain weave are arranged vertically and horizontally as the reinforcing inorganic cloth 4, warpage of the laminated panel can be more effectively prevented.

<Embodiment 3> Another embodiment of non-combustible paper used as a skin of the laminated panel of the present invention will be described.

FIG. 5 shows the non-combustible paper cut out sequentially. And, as shown in FIG.
The laminate has a layered structure, 10 is non-combustible paper, and 11 is an inorganic cloth for reinforcement. That is, this noncombustible paper is configured as a reinforced noncombustible paper including the inorganic cloth 11 as a reinforcing layer between the upper and lower noncombustible papers 10.

In the reinforced noncombustible paper of the present embodiment, the noncombustible paper 10 itself is obtained by papermaking from a slurry containing sepiolite as a main material and has substantial noncombustibility as described above. . The inorganic cloth 11 as a reinforcing material is a woven cloth having a relatively coarse weave. In this case, the glass fiber plain woven cloth used in Example 2 is used. Therefore, the reinforcing inorganic cloth 1
1, the non-combustible paper 10 on both sides is integrated through its texture,
The inorganic cloth 11 is in a state of being buried integrally in untwisted paper mainly composed of sepiolite.

Such a reinforced noncombustible paper is prepared, for example, by bonding a wet paper body immediately after papermaking of a slurry containing sepiolite as a main material to both sides of a reinforcing inorganic cloth, and then, if necessary, using a roll. After hanging, it can be obtained by drying and solidifying. In this case, the wet sepiolite paper body easily adheres to and penetrates the inorganic cloth. In this way, a non-combustible paper in which the reinforcing inorganic cloth is integrally embedded can be formed.

According to the reinforced noncombustible paper thus formed, the physical strength of the reinforcing inorganic cloth is improved by the reinforcing action of the reinforcing inorganic cloth. Therefore, by applying this as the skin of the laminated panel of the present invention, the same effect as in the case of Example 2 can be obtained. The reinforced noncombustible paper can be used as the skin 2 of the laminated panel of the second embodiment.

[0060]

As described above, the laminated panel of the present invention is
A core formed of non-combustible paper containing sepiolite as a main component, a pair of skins covering both sides of the core made of non-combustible paper containing sepiolite as a main component, and an inorganic filler and an inorganic binder. And a filling layer which is integrally formed on the surface of the core and embeds the tip portions on both sides of the core to integrally connect each skin and the core. Therefore, not only is the laminated panel light-weight, sound-insulating, or heat-insulating, etc., but it is also formed as a substantially inorganic molded body, so that it is excellent in fire resistance and fire resistance. In addition, since the core and the skin are integrated with each other including the filling layer, the mutual bonding property is high and the strength is high. Further, the skin is supported and reinforced by the filling layer formed thereon, so that the skin has excellent surface smoothness. Further, it has good compatibility with a surface material made of an inorganic material such as marble or inorganic cloth, and is suitable for ceramic coating and the like. Further, zinc borate as a curing agent for water glass is
By using it as a curing agent for glass, its curing
(Gelling) time can be controlled easily
You. And in this case, the water glass composition containing the inorganic filler
The object hardens and solidifies while containing water. And nothing
Using Shirasu balloon as the main component as a filler,
Water glass with zinc borate as a hardener, especially as an inorganic binder
The goal of lightweight is fully achieved by using
be able to.

According to the aspect of the laminated panel of the present invention, a reinforcing inorganic cloth is interposed between the skin and the filling layer (Claim 2). Alternatively, a laminated body in which the skin includes the reinforcing inorganic cloth. (Claim 3)
Also excellent in panel bending strength, perforation strength, etc.

Therefore, the laminated panel of the present invention can be advantageously used as a general building material or a core material thereof. Among them, especially, due to its excellent fire resistance and fire resistance, the core material of a fire door or It can be used particularly suitably as a fireproof panel. It is also suitable as a furnace wall of a dryer.

[Brief description of the drawings]

FIG. 1 is a sectional view of a laminated panel according to one embodiment of the present invention.

FIG. 2 is a perspective view showing the whole of the laminated panel of FIG. 1 with a part cut away.

FIG. 3 is a cross-sectional view showing a state in a manufacturing process of the laminated panel according to one embodiment of the present invention.

FIG. 4 is a sectional view of a laminated panel according to another embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the non-combustible paper used as the skin of the laminated panel of the present invention, which is sequentially cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honeycomb core 2 Skin 3 Filling layer 4 Inorganic cloth for reinforcement 10 Noncombustible paper 11 Inorganic cloth for reinforcement

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-147134 (JP, A) JP-A-52-146924 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (3)

(57) [Claims] 1. A core formed of noncombustible paper containing sepiolite as a main component, a pair of skins made of noncombustible paper containing sepiolite as a main component, covering both surfaces of the core, an inorganic filler and an inorganic binder. An inorganic filler mainly composed of a shirasu balloon, which is integrally formed on the inner surface of each of the epidermis and which is integrally connected to each of the epidermis and the core by embedding tip portions on both surfaces of the core.
And inorganic binder for water glass using zinc borate as a curing agent
Laminated panels, characterized by comprising a filling layer made of a. 2. The laminated panel according to claim 1, further comprising a reinforcing inorganic cloth interposed between the skin and the filling layer. 3. The laminated panel according to claim 1, wherein the skin is made of reinforced non-combustible paper containing an inorganic cloth as a reinforcing layer between layers of non-combustible paper containing sepiolite as a main component.