JPH0133329Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a nonflammable cardboard made of an inorganic sheet and used for wall covering materials, ceiling panels, sliding doors, cardboard boxes, etc.

(Prior Art) Conventionally, corrugated cardboard is formed by applying a liner to one or both sides of a corrugated core base paper.

Waterproof corrugated board is an example of corrugated board that is resistant to deterioration in strength due to water.

(Problems to be solved by the invention) As mentioned above, there are various types of conventional cardboard that are resistant to water, such as water-repellent cardboard, water-resistant cardboard, and water-blocking cardboard. However, there is no non-flammable, heat-insulating cardboard, and although it is lightweight and easy to process, it is easily flammable and has low heat-insulating properties when used for building interior materials such as wall coverings and ceiling panels. There were problems such as lack of sexuality.

In view of the above-mentioned problems, the object of the present invention is to provide a noncombustible corrugated board that has noncombustibility and heat insulation properties and can be used as a noncombustible building material for wall coverings, ceiling panels, etc., and as noncombustible cardboard boxes.

[Structure of the idea]

(Means for solving the problem) The nonflammable corrugated board of the present invention has an inorganic filler containing aluminum hydroxide in an amount of 70 to 80% by weight of the total amount;
20 to 30% by weight of the total amount is inorganic fibers and pulp excluding asbestos fibers, and the aluminum hydroxide is 50% by weight or more of the total amount, and the pulp is 20% by weight of the total amount.
It consists of a liner made of an inorganic sheet with an oxygen index of 80 or more and an oxygen index of 80 or more by weight, and a core.

(Function) In the non-combustible cardboard of the present invention, when aluminum hydroxide, which is contained in 50% or more of the total weight, reaches the combustion temperature of the pulp, it evaporates crystallization water and improves its non-combustibility. In addition, since the inorganic filler containing aluminum hydroxide is 70 to 80% by weight, it has little elasticity when absorbing water, and when it comes into contact with the core with adhesive, it has little elasticity and wrinkles on the surface even if the adhesive is absorbed. Does not occur. In addition, inorganic fibers and pulp account for 20 to 30% of the total amount.
Since the pulp is less than 20% by weight of the total amount, the inorganic filler is reinforced with inorganic fibers, so it does not deform under high heat, and it does not contain asbestos, so it does not pollute the environment during manufacturing. do not have.

Since it has an oxygen index of 80 or higher, it does not burn even when the atmospheric oxygen concentration is 80% or higher, making it a quasi-noncombustible material according to building material standards.

(Example) An example of the present invention will be described using a single-sided cardboard type shown in FIG.

1 is a liner made of an inorganic sheet; 2
is a core made of a corrugated plate and is bonded onto the liner 1 at its troughs 3.

The composition of the inorganic sheet constituting the liner 1 includes aluminum hydroxide as an inorganic filler, and clay, mica, talc, antimony trioxide, calcium carbonate, silica, glass powder, magnesium hydroxide, gypsum, etc. used in combination with aluminum hydroxide. Become. The blending amount is 70 to 80% by weight as an inorganic filler, and the aluminum hydroxide is 50% by weight or more of the total amount. Glass fibers and ceramic fibers are used as inorganic fibers other than asbestos. Pulp includes Sarashi, Suzarashi, NL type kraft pulp,
Linta pulp, recycled pulp, etc. are used, and the blending amount is 20% by weight or less of the total amount.

Other binders used in small amounts include acrylic fibers, butylene butadiene rubber, acrylonitrile butadiene rubber, vinylidene chloride fibers, ethylene vinyl acetate resin emulsions, thermoplastic resins such as polyamide resins, phenolic resins, epoxy resins, and silicone resins. There are thermosetting resins such as

Further, as a binding aid for fixing these binders to the wet sheet during papermaking, polyacrylamide or sodium polyacrylate to which sulfuric acid is added, polyamide polyamine epichlorohydrin resin, etc. are used.

In addition, small amounts of sizing agents such as glue, alkyl ketten dimer, rosin size, plant size, and wax emulsion may be added as necessary.

An example of the composition is as follows.

{N kraft pulp 18 (wt%) 100 (wt%) Glass fiber (6 mm) 5 (wt%) Aluminum hydroxide 77 (wt%)} Modified acrylic resin emulsion 3 (wt%) Polyacrylamide 0.1 (wt%) Sulfuric acid Band: 0.9 (parts by weight) Rosin size: 0.1 (parts by weight) An inorganic sheet having a thickness of 2.1 mm, a specific gravity of 0.8, and an oxygen index of 100 is obtained by paper-making the blend having the above composition.

The liner 1 can be made of the above-mentioned inorganic sheet, which is decorated, embossed, laminated with aluminum foil, kraft paper, organic fiber woven fabric or non-woven fabric, glass fiber woven fabric or non-woven fabric, or decorated. There are some that are embossed, and some that are decorated and have perforations.

The core 2 is generally a core paper used for corrugated cardboard or an inorganic sheet made of the same material as the liner 1.

Next, other embodiments will be described.

Figure 2 shows a double-sided cardboard type, with liners 1 and 1 on both sides of the valleys 3 and peaks 4 of the core 2 made of corrugated board.
is glued.

FIG. 3 shows a double-sided corrugated cardboard type in which cores 2, 2 made of corrugated plates are formed in two stages, upper and lower, with an intermediate liner 1 in between.

In FIG. 4, a honeycomb-shaped core 2 is sandwiched between the upper and lower liners 1, and the upper and lower sides are bonded to the liners 1, 1.

In FIG. 5, a large number of elongated tubular cores 2 are arranged in parallel between the upper and lower liners 1, with their axes oriented horizontally, and their peripheral surfaces are bonded to the upper and lower liners 1, 1.

In FIG. 6, the core 2 has a short tubular shape, and a large number of cores are vertically arranged between the upper and lower liners 1, 1, and the upper and lower end surfaces are adhered to the upper and lower liners 1, 1.

FIG. 7 shows a core 2 formed by bending a narrow core paper in a serpentine shape, with the width direction being the vertical direction, which is sandwiched between upper and lower liners 1 and bonded together.

[Effect of idea]

According to the present invention, aluminum hydroxide, which is contained in a large amount of 50% by weight or more of the total amount of the liner, evaporates water of crystallization when the pulp reaches the combustion temperature, increasing the nonflammability of the liner. It is suitable for use in external wall covering materials, ceiling panels, building material boards such as sliding doors, and nonflammable cardboard boxes. In addition, the liner contains 70 to 80% by weight of an inorganic filler containing aluminum hydroxide, so it has little elasticity when absorbing water, so when the liner is bonded to the core with an adhesive, even if the liner absorbs the adhesive. It has little expansion and contraction, so it conforms to the surface of the product and does not cause wrinkles, improving the appearance and improving processing accuracy. Further, even if the liner is made of adhesive, it has little elasticity, so it is possible to laminate the liner with non-stretchable aluminum foil or the like, thereby making it possible to obtain a liner with high surface hardness. Furthermore, even when a cardboard box is formed, due to the dimensional stability of the liner, there is little deformation due to environmental changes between high temperature and humidity and room temperature and normal humidity, making it safe for transportation to different environments. In addition, the liner is reinforced with 20 to 30% by weight of inorganic fiber and pulp.
Since it is less than 20% by weight, it will not deform even under high heat, and since it does not contain asbestos, there is no risk of contaminating the environment during manufacturing. Since the liner is nonflammable even when the atmospheric oxygen concentration is 80% or more, it can be used as a quasi-noncombustible material as a building material standard. Furthermore, if the core is made of an inorganic sheet like the liner, the above-mentioned nonflammability, dimensional stability, moisture resistance, and heat resistance can be further improved.

[Brief explanation of the drawing]

1 to 7 are sectional views and partially cutaway perspective views of cardboard boxes showing different embodiments of the present invention, respectively. 1... liner, 2... center core.

Claims (1)

[Scope of claims for utility model registration] (1) 70-80% by weight of the total amount is an inorganic filler containing aluminum hydroxide, 20-30% by weight of the total amount is inorganic fibers and pulp excluding asbestos fibers, and the water A non-combustible corrugated board comprising a liner made of an inorganic sheet containing aluminum oxide in an amount of 50% by weight or more, the pulp in an amount of 20% by weight or less of the total amount, and an oxygen index of 80 or more, and a core. (2) In the core, 70 to 80% by weight of the total amount is an inorganic filler containing aluminum hydroxide, 20 to 30% by weight of the total amount is inorganic fibers and pulp excluding asbestos fibers, and the entire amount is the aluminum hydroxide. The non-combustible cardboard according to claim 1, wherein the pulp is 50% by weight or more and 20% by weight or less of the total amount, and the non-combustible cardboard is made of an inorganic sheet having an oxygen index of 80 or more.