JPH04140389A - Fire prevention door - Google Patents

Abstract

PURPOSE:To make it possible to increase incombustibility by sticking a plurality of particle boards consisting of close front and rear layers and coarse intermediate layers on each other to form cores, and coating the front and rear surfaces with facing plates through fire resisting boards. CONSTITUTION:A particle board 10 consisting of a large number of small pieces of wood packed and solidified together as a unit is constituted of close front and rear layers 10a... and coarse intermediate layers 10b.... After that, a plurality of particle boards 10 are stuck on each other to form cores 100, and the front and rear surfaces of them are coated with facing plates 30 and 30 such as plywood, etc. through fire resisting boards 20 and 20. According to the constitution, in the case of a fire, the spread of the fire to the insides of the cores 100 in the vicinity of a burning place is repeatedly braked, and a burning speed can be retarded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wood-based flame-retardant fire door using particle board as a core material.

[Conventional technology] In mid-1990, the Building Standards Act was partially revised, and the Class A and Class B fire doors stipulated in the Building Standards Act now include not only doors made of iron or steel-framed concrete, but also wood-based fire doors. Doors can now also be approved if they pass a prescribed fire resistance test.

In the Class A and Class B fire door tests, the flame blocking performance, smoke blocking performance, and structural stability performance of the door are tested, respectively, when the door is continuously heated with flame at approximately 800°C for several tens of minutes.

As shown in Figure 2, a wooden fire door that can pass the Class A and Class B fire door tests is a wooden fire door made of a single thick board made by pressing together many small pieces of wood using adhesive. Particle board 10 is used as the core material 100, and the front and back surfaces of the core material 100 are interposed through flame-retardant fireproof board 20,
A fire door constructed by covering with a decorative board 30 such as a plywood board is conceivable.

[Problems to be Solved by the Invention] However, when the above-mentioned wood-based fire door was prototyped and the door was continuously heated with flame at about 800°C, the core material 100 constituting the door prematurely deteriorated. It was found that the wood-based fire door could not pass the Class A and Class B fire door tests.

When we investigated the cause of this, we found that it was due to the following reasons.

Particle board 10, which is commonly used and is made by pressing together a large number of small pieces of wood, has front and back layers 10a that are hard and dense, as shown in FIG. On the other hand, an intermediate layer 10 sandwiched between the front and back layers 10a
b is roughly formed to have a large number of small holes. This is based on the following reasons. particle board】O
When using the particle board, the front and back layers 10a of the particle board often need to be subjected to various processing such as cutting and cutting, and various parts are fastened with screws.
It is made hard and dense like normal wood to make it easier to screw in.

On the other hand, the intermediate layer 10b of the particle board is formed roughly because it is impossible to perform the above-described processing or to screw various members. The intermediate layer 1 occupies a large portion of the particle board 10.
In addition to saving the material constituting 0b, the overall weight of the particle board 10 is also reduced.

Therefore, when the particle board 10 is burned, the combustion rate is slow in the densely formed front and back layers 10a, but the combustion rate is slow in the coarsely formed intermediate layer 10b, which occupies most of the other parts. Burning speed is extremely fast.

When this was confirmed through experiments, it was found that in the front and back layers 10a of the particle board, the internal combustion rate progressed at a rate of about 0.7 mm per minute, but in the middle layer 10b of the particle board, the internal combustion The speed is 1 per minute. It was found that it progresses rapidly at a speed of around 2 mm. By the way, in general wood, the internal combustion rate progresses at a rate of about Q, 9 mm per minute.

Therefore, when the core material 100 made of a single particle board 10 is burned, the combustion rate is suppressed to a low level by the densely formed front and back layers 10a, but the coarsely formed right below the front and back layers 10a. In the middle layer 10b,
The burning speed progresses extremely fast, and in the core material 100 made of one particle boat O, in which the easily flammable coarse intermediate layer 10b occupies a large portion, the entire core material 100 is burnt out in a short period of time. It is from.

In addition, in the above-mentioned prototype wooden fire door, when one side of the door is continuously heated by a fire of about 800''C, one side of the particle board 10 constituting the core material 100 The core material 10 made of particle board 10 has become excessively dry near the surface thereof.
0 was severely warped and twisted to one side, compromising the structural stability of the door.

Therefore, as a result of intensive research, the inventor of the present invention found that even if there is a particle board 10 that combines the dense front and back layers 10a and the rough intermediate layer 10b as described above, it is possible to bond a plurality of these particle boards 1o together. By forming the core material 100, when the door is continuously heated with a flame of about 800'C, the combustion speed of the core material 100 can be significantly delayed, and the core material 100 can be greatly warped or twisted. We discovered that this can be prevented by using a core material 100 made by laminating multiple pieces of particle board 10.
Developed a flame-retardant fire door.

That is, the present invention prevents the core material made of particle board from burning out prematurely, and prevents the core material made of particle board from being significantly warped or twisted when the door is continuously heated with flame or the like at about 800 degrees Celsius. Our aim is to provide a wood-based fire door that can pass the Class A and Class B fire door tests.

[Means for Solving the Problems] For the above purpose, the fire door of the present invention is a particle boat formed by pressing together a large number of small pieces of wood,
The front and back layers are formed densely, and the intermediate layer sandwiched between the front and back layers is used as a core material. In a fire door covered with a decorative board,
It is characterized in that the core material is formed by laminating a plurality of particle boards together.

"Function" In the fire door with the above configuration, the core material is formed by laminating a plurality of particle boards with densely formed front and back layers and a coarsely formed intermediate layer. One or more dense flame-retardant layers made of densely formed front and back layers of particle board are provided not only near the front and back surfaces of the material but also inside the core material.

Therefore, when the core material is burnt, the burning point passes through the dense flame retardant layer made of the front and back layers of the particle board that covers the front and back surfaces of the core material, and the part of the particle board directly below it that is more flammable. When it reaches the combustible layer consisting of a coarse intermediate layer, its combustion rate increases once, but
When the burning point reaches the dense flame-retardant layer made of the front and back layers of the particle board inside the core material, the combustion speed is again suppressed to a low level. Thereafter, each time the burning point sequentially reaches the flame retardant layer made up of the dense front and back layers of the particle board inside the core material, a brake is applied to the faster combustion speed, and the burning speed of the core material repeats. It can be suppressed late.

In addition, since the core material is made by bonding multiple pieces of particleboard together, if one side of the door is continuously heated by a fire to approximately 800 degrees Celsius, the side part of the core material on one side of the door will remain intact. If the surface area of the particle board that is being attached becomes excessively dry and the particle board tries to warp or twist, the particle board that is pasted next to it will cause the particle board to warp or twist. This prevents the core material from warping or twisting significantly.

“Example 1 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a preferred embodiment of the fire door of the present invention, and in detail shows a partial cross-sectional view thereof. The embodiment shown in this figure will be described below.

In the figure, reference numeral 100 denotes a core material in the form of a thick plate, consisting of a plurality of particle boards 1o (three pieces in the figure) made of small pieces of wood pressed together with an adhesive, and a flame-retardant adhesive. It is formed by bonding it together using. In the particle board 1o, the front and back layers 10a are formed densely, and the intermediate layer 10b sandwiched between the front and back layers 10a is formed roughly.

20 is a plate-shaped flame-retardant fireproof board made of calcium silicate fireproof material or the like. This fireproof board 20 is attached to the front and back surfaces of the core material 100 using adhesive, wood screws, etc., and the front and back surfaces of the core material 100 are attached to the fireproof board 2.
0, each continuously and widely covered.

30 is a thin plate-shaped decorative board. For this decorative board 30, a plywood board or the like is used, in which a plurality of thin wood boards are pasted together using an adhesive, with their fibers intersecting vertically and horizontally. This decorative board 30 is attached to the surface of the fireproof board 20 covering the front and back surfaces of the core material 1°O using an adhesive, and the front and back surfaces of the core material 1°O are bonded through the fireproof board 20. The decorative boards 30 cover each of them continuously without any gaps.

The fire door shown in FIG. 1 is constructed as described above.

Next, its effect will be explained.

In the fire door configured as described above, when the core material 100 is burned by continuously heating the door with a flame of approximately 8° OoC, the dense front and back surfaces of the particle board covering the front and back surfaces of the core material 100 are burned. In the flame retardant layer 100a consisting of the layer 10a, the combustion speed is slow (suppressed), and the burning area is located near the core material 1.
o○ slowly progresses towards the inside. Next, the flammable layer 10 inside the core material 100 consists of the coarse intermediate layer 10b of the particle board directly under the dense front and back layers 10a of the particle board that cover the vicinity of the front and back surfaces of the core material 100.
When the temperature reaches 0b, the combustion speed increases, and the combustion location rapidly advances toward the inside of the core material 100. Next, the combustion point is a combustible layer 100 consisting of the coarse intermediate layer 10b.
When the flame retardant layer inside the core material 100 consisting of the dense front and back layers 10a of the particle board passes through B and reaches 00a, a brake is applied to the combustion speed, and the inside of the core material 100 at the burning point The speed of progress is significantly slowed down. Below, the combustion locations are sequentially shown in the flame retardant layer 1 inside the core material 100.
Each time it reaches 00a, the core material 10 at the combustion point that has rapidly progressed through the combustible layer 100b inside the core material 100 before
A brake is applied to the combustion speed into the core material 100, and the speed at which the combustion part moves into the core material 100 is repeatedly suppressed.

In addition, if one side of the door continues to be heated to approximately 800°C due to a fire or the like, the vicinity of the surface of the particle board 10 forming one side of the core material 100 of the door may become excessively dry. When the particle board 10 tries to warp or twist, the particle board 10 bonded adjacent to it prevents the particle board 10 from warping or twisting, and the core material 100 Large warping or twisting is prevented.

1. Effects of the Invention] As explained above, in the fire door of the present invention, when the door is continuously heated with a flame of about 800°C or the like to cause combustion, the combustion point does not progress into the interior of the core material. By repeatedly applying the brakes, the rate of progress of the combustion site into the interior of the core material can be repeatedly slowed down. In addition, it is possible to reliably prevent the core material of the fire door from burning out at an early stage.

In addition, if one side of the door is continuously heated with a flame of about 800°C, the area near the surface of the particle board that makes up one side of the core material of the door becomes excessively dry. If the particle board tries to warp or twist, the particle board bonded next to it prevents the particle board from warping or twisting, and prevents the core material from warping or twisting significantly. It can be prevented.

Therefore, according to the fire door of the present invention, the door can be
This is a construction that will not cause the core material to burn out prematurely or cause the core material to warp or twist significantly, thereby impairing the structural stability of the door, in the event of continued heating due to a fire, etc. We can provide wood-based flame-retardant fire doors that can pass the fire resistance test for Class A and Class B fire doors based on the Standards Act.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a fire door according to the present invention, and FIG. 2 is a partial cross-sectional view of a conventional fire door. 10... Particle board, 10a... Front and back layer, 10b... Intermediate layer, 100...
- Core material, 20... Fireproof board, 30... Decorative board. Patent applicant: Tateshina Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. A particle board made by pressing together a large number of small pieces of wood, with the front and back layers formed densely, and the middle layer sandwiched between the front and back layers formed roughly, as the core material. , the front and back sides of the core material,
1. A fire prevention door covered with a decorative board such as a plywood board through a fireproof board, characterized in that the core material is formed by laminating a plurality of particle boards together.