JP2000116808A - Fire-resistant screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistant screen in which a texture shift preventive screen having uniform thickness and increased strength can be formed, and in which texture shift preventive films can be formed either on one side or on both sides of a nonflammable texture of the screen, and in which a texture shift preventive film having a plural-layered structure and multi-function can be formed. SOLUTION: This fire-resistant screen 3 is rolled up by a roll-up device set on the ceiling of a building normally, and is drawn out of the roll-up device and hung down when a fire breaks out. In the fire-resistant screen 3, resin films 10 and 11 are adhered as texture shift preventive films to one side or both sides of a plain or satin woven single-layered silica cloth 9, for example, with a yarn 8 mainly consisting of silica fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof screen for preventing the spread of flames and smoke when a fire occurs in a building.

[0002]

2. Description of the Related Art As a new device for preventing the spread of flame or smoke when a fire occurs in a building, a fire spread prevention device 50 as shown in FIG.
328137). This fire spread prevention device 50 hangs a refractory screen 52 made of glass cloth (woven cloth woven with glass fiber yarn) from a winding device 51 of a ceiling 53 to a height of about 50 to 100 cm above a floor 54 and a ceiling 53. Water 56 is sprayed onto the refractory screen 52 from a sprinkler 55 installed nearby to wet the refractory screen 52. This fire screen 52
May melt when exposed to the flame 57 as it is, but does not melt when wet as described above because the temperature is suppressed to 50 to 60 ° C. by the cooling effect due to the evaporation of the water 56. Further, below the refractory screen 52, the film of water 56 dripping from the lower end of the refractory screen 52 blocks the passage of the flame 57 and smoke 58.

Recently, a refractory screen 5 made of silica cloth (woven cloth woven with a silica fiber yarn) has been used.
A fire spread prevention device which eliminates the necessity of injecting the water 56 by the sprinkler 55 by using No. 2 is also considered.

[0004]

The above refractory screen 5
2 must hang in a clean rectangular shape as shown by the solid line in FIG. However, the refractory screen 52 made of inorganic fibers such as glass cloth and silica cloth (especially silica cloth) is liable to be deformed in the direction in which the yarns slide and extend in the plane direction. Deformed into shape (so-called misalignment) and sagged, fireproof screen 5
There was a problem that a gap was formed on two sides.

Therefore, as shown in FIG. 5, a resin coat 60 serving as a misalignment preventing film is formed on one or both sides of a refractory screen 52 made of silica cloth, and slippage between the yarns is stopped to prevent misalignment. That is being considered. At present, as a material for the resin coat 60,
Materials using a polyethylene resin, a modified vinyl acetate resin (EVA), an acrylic resin, or the like as a main component have been studied. The resin coat 60 has the following advantages. Advantages The composition of the material can be set freely. Advantages The thickness can be easily set (except for very thin ones). Advantages The resin material can be penetrated even into a well-textured cloth.

However, the resin coat 60 has the following disadvantages. Disadvantages Coating unevenness is likely to occur, and the film thickness becomes uneven. Disadvantages Very thin ones are difficult to form. Disadvantages The film strength is relatively weak. Disadvantages In the case of a one-sided coating, depending on the conditions, the material may escape from the coated surface to the opposite surface. Disadvantages Depending on the fabric structure, it may be difficult to coat on both sides. For example, a structure in which a warp or a weft floats long and covers the cloth surface like a satin weave. Disadvantages Single composition, single layer structure, low function.

Accordingly, an object of the present invention is to form a misalignment preventing film having a uniform film thickness and a high film strength, and to easily form the misalignment preventing film on one or both surfaces of a nonflammable woven fabric. It is an object of the present invention to provide a refractory screen that can be formed and can form a high-performance misalignment prevention film with a multilayer structure.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a winding apparatus which is normally wound on a winding device installed on a ceiling of a building, and is unwound from the winding device when a fire occurs. In the hanging fire-resistant screen, a resin film serving as a misalignment prevention film is attached to one or both surfaces of a non-combustible woven fabric woven with a yarn mainly composed of inorganic fibers.

Here, the inorganic fiber which is the main constituent of the yarn is not particularly limited, and silica fiber, alumina-silica-based fiber, alumina fiber, rock wool, slag wool, general or high heat-resistant glass fiber and the like can be used. As a standard of the heat resistance, it is preferable that the safe use temperature is 600 ° C. or higher.

[0010] The yarn may contain organic fibers or metal fibers in order to compensate for brittleness or enhance flexibility, weaving properties, and the like. Examples of the organic fibers include flame-retardant fibers such as flame-retardant soft fibers and aramid fibers, and non-combustible fibers such as carbonized organic fibers (for example, polyacrylonitrile fibers carbonized to about 60%). Stainless steel fibers can be exemplified as the metal fibers.

[0011] The yarn may be reinforced with a reinforcing linear body to increase the tensile strength of the refractory screen. Examples of the reinforcing linear body include inorganic fibers such as silica fiber, general glass fiber, and alumina fiber to be inserted into the yarn as a core yarn, and metal wires such as a stainless steel wire twisted with the yarn as the reinforcing wire.

The weaving method is not particularly limited, and examples thereof include plain weave, twill weave, and satin weave. The non-combustible woven fabric may be a single layer, but may be joined to two or more layers.

[0013] The thickness of the refractory screen is not particularly limited.
The thickness is preferably 0.3 to 6.0 mm, more preferably 0.6 to 2.0 mm, so as not to be flooded by hot air. Therefore, a preferable range of the thickness of the non-combustible woven fabric is determined according to the number of layers. In the case of two or more layers, the thickness and type of the non-combustible woven fabric of each layer may be different.

Examples of the resin material for the resin film include vinyl chloride, vinylidene chloride, polyolefin (polyethylene, polypropylene), acrylic, nylon, ethylene tetrafluoride, and vinylidene fluoride.

It is preferable that a flame retardant suitable for each resin material is added to the resin film to make it hard to burn in the event of a fire. Examples of the flame retardant include decabromodiphenyl ether and antimony trioxide (compatible with vinyl chloride, vinylidene chloride, and acrylic), and phosphate esters (compatible with polyethylene and polypropylene).

The resin film may have a single-composition / single-layer structure, but may have a multiple-composition / multi-layer structure. In the latter case, a high-performance resin film combining the characteristics (strength, adhesiveness, etc.) of each composition / layer is used. Can be formed.

The optimum thickness of the resin film depends on its composition and layer structure, and is not particularly limited.
0 μm is preferred. If the thickness is less than 20 μm, the film strength tends to be insufficient, and if it exceeds 100 μm, the amount of generated smoke increases.

The following embodiment can be exemplified as a method of attaching the resin film to the non-combustible woven fabric. A method in which a commercially available resin film is used, and the resin film is adhered to a non-combustible woven fabric by means such as bonding with an adhesive or heat welding by melting the resin film itself. A method of sticking to a non-combustible woven fabric while making a resin film using a calender roll.

[0019]

1 to 3 show a first embodiment of the present invention. The fire spread prevention device 1 is taken up by the winding device 2 installed above or below the ceiling 15 of the building, and is wound up by the winding device 2 in normal times, and is unwound from the winding device 2 in the event of a fire. A fireproof screen 3 hanging down to the vicinity of a floor 17, a fire detector 4 installed on a ceiling 15, a wall 16, and the like, and a control device 5 for operating the winding device 2 when the fire detector 4 detects the occurrence of a fire. It is composed of The winding device 2 includes a winding shaft 6 rotatably supported,
And a drive device 7 using a motor for driving the winding shaft 6 to rotate. As the fire detector 4, a temperature sensor, a smoke sensor, a gas sensor, and the like are used alone or in combination, and the occurrence of a fire is detected by detecting a temperature rise, smoke, gas, and the like.

The refractory screen 3 is, as shown in FIG.
Resin films 10 and 11 serving as misalignment prevention films are formed on one or both sides of one layer of non-combustible woven fabric (silica cloth) 9, for example, plain or satin-woven with yarn 8 mainly composed of silica fiber.
Is affixed. Yarn 8 is for example 95%
The yarn 8 is a twisted yarn made of silica fiber (high silicate glass fiber) containing the above SiO ₂ component, and the thickness of the yarn 8 is, for example, 170.
Tex, and the thickness of the silica cloth 9 is, for example, about 0.1 mm.
6 mm.

FIG. 2 shows four embodiments, in each of which the resin films 10 and 11 are added with a flame retardant. (A) is an example in which a resin film 10 having a single-layer structure made of vinyl chloride resin is adhered to one surface of a plain-woven silica cloth 9 by heat welding. (B), a resin film 10 of a single layer structure made of vinyl chloride resin is adhered to one side of a satin silica cloth 9 with an adhesive, and a resin film of a single layer structure made of polyethylene resin is formed on the other side. Reference numeral 11 denotes an example in which an adhesive is attached. (C) is an example in which a two-layer resin film 10 is adhered to one surface of a plain-woven silica cloth 9 by heat welding. The resin film 10 is formed by joining a surface layer 10a made of a nylon resin and a joining layer 10b made of an acrylic resin. (D), a resin film 10 having a three-layer structure is adhered to one side of a satin-woven silica cloth 9 by heat welding, and a resin film 11 having a single-layer structure made of vinylidene chloride resin is bonded to the other side. This is an example of affixed with. The resin film 10 has a surface layer 10 made of vinylidene difluoride resin.
a, an intermediate layer 10c made of vinyl chloride resin, and a bonding layer 10b made of acrylic resin.

In the resin film 10 shown in FIG. 2C, the surface layer 10a made of a nylon resin has excellent film strength and abrasion resistance, and the bonding layer 10b made of an acrylic resin is bonded to a silica cloth of a base material through a primer. High performance due to excellent adhesion. In the resin film 10 of FIG. 2D, the surface layer 10a made of vinylidene difluoride resin has a higher melting point than that of vinyl chloride or the like, so that the film is less likely to be cut during heat welding. It is excellent in low adhesiveness (the property that films do not easily adhere to each other when wound on the winding shaft 6). Further, the intermediate layer 10c made of vinyl chloride resin has excellent adhesion to silica cloth and flame resistance, and the bonding layer 10 made of acrylic resin.
Since b is excellent in adhesion to the silica cloth of the base material via the primer, it is highly functional.

In the case of a structure in which warps and wefts are finely combined as in the plain weave shown in FIGS. 2A and 2C, the resin film 10 can be formed by simply attaching the resin film 10 to one surface. It is highly effective in stopping slippage between the yarns because it is bonded to both the yarn and the weft. Of course, it is even better if a resin film is stuck on both sides. However, FIGS. 2 (b) and 2 (d)
In the case of a structure in which a warp or a weft floats long and covers the cloth surface, as in the case of a satin weave or the like, simply attaching the resin film 10 on one side causes the resin film 10 to become one of the warp or the weft. Even if a large number of joints are made, the other does not join much, so that the effect of stopping slippage between the yarns may be insufficient. For this reason, it is preferable to stick resin films on both sides.

The fire spread prevention device 1 configured as described above
Since the refractory screen 3 is wound around the winding shaft 6 of the winding device 2 in normal times, it is not bulky and can be easily installed in any building. When a fire occurs, the fire detector 4 detects the occurrence of the fire, and the control device 5 automatically activates the driving device 7 of the winding device 2 to unwind the fireproof screen 3 from the winding device 2. Hang down to near floor 17.

The refractory screen 3 is made of a silica cloth 9
Resin film 1 on one or both sides of
Since 0 and 11 are adhered, misalignment as shown by a two-dot chain line in FIG. 4 does not occur. Further, since the silica cloth 9 has high heat resistance and fire resistance, there is no need to sprinkle water and get wet. For this reason, the sprinkler and the water piping which were required in the conventional example become unnecessary, and the labor and cost for installation can be reduced. Therefore, even in a building without water facilities or a site where water pipes are not widely distributed, it can be installed easily and inexpensively.

Each of the refractory screens 3 shown in FIGS.
The following fire protection performance and smoke protection performance required by the Building Standards Law were tested, and all performances were satisfied. (1) Fire protection performance: After heating the both sides of the refractory screen for 60 minutes while controlling until the heating temperature reaches 925 ° C., the following judgments are made. Flames should not occur on the back side of the heated surface due to heating. No gaps or cracks reaching the back side of the heated surface due to heating. No significant fuming should occur on the back side of the heated surface due to heating. After heating is completed, a sand bag weighing 3 kg is placed 50 cm vertically.
Do not cause harmful destruction, peeling, falling off, etc. in fire prevention when dropped from a height and subjected to impact. (2) Smoke barrier performance: Air pressure is applied to both sides of the fireproof screen, and the pressure difference between the air pressures on both sides is 2k.
g / m ² , the air flow rate is 0.2 m ³ / m
² or less.

Even when the refractory screen 3 is exposed to a flame, the flame retardant is added to the resin films 10 and 11 so that the resin films 10 and 11 may burn violently or emit significant smoke. There was no.

Finally, the advantages of forming the misalignment prevention film from the resin film will be summarized. The film thickness becomes uniform. Even an extremely thin one can be easily formed and can be made uniform. Compared with resin coating, film strength (including abrasion resistance) is relatively high. It cannot escape to the opposite side like a resin coat. It is easy to apply on both sides and is not bound by the structure of non-combustible woven fabric. High adhesion between the resin film and the silica cloth of the substrate. While the resin film is present, the smoke resistance is extremely high (there is no smoke passage).

The present invention is not limited to the configuration of the above embodiment, but can be embodied with appropriate modifications without departing from the spirit of the invention.

[0030]

As described above, the refractory screen of the present invention can be formed as described above, so that a misalignment preventing film having a uniform film thickness and a high film strength can be formed. In any case, the misalignment prevention film can be easily formed, and a high-performance misalignment prevention film having a multilayer structure can be formed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fire spread prevention device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a refractory screen of the fire spread prevention device.

FIG. 3 is a sectional view of a conventional fire spread prevention device.

FIG. 4 is a front view of a fireproof screen of the fire spread prevention device.

FIG. 5 is an enlarged sectional view of the refractory screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire spread prevention device 2 Winding device 3 Fireproof screen 4 Fire detector 5 Control device 6 Winding shaft 7 Drive device 8 Yarn 9 Silica cloth 10 Resin film 10a Surface layer 10b Joining layer 10c Intermediate layer 11 Resin film 15 Ceiling 16 Wall 17 Floor

Claims (3)

[Claims] 1. A fireproof screen that is wound up by a winding device installed on the ceiling of a building in normal times and unwound from the winding device and hangs down when a fire occurs, and is woven with a yarn mainly composed of inorganic fibers. A fire-resistant screen comprising a non-combustible woven fabric and a resin film serving as a misalignment prevention film adhered to one or both surfaces thereof. 2. The fireproof screen according to claim 1, wherein a flame retardant is added to the resin film. 3. The refractory screen according to claim 1, wherein the resin film has a multi-composition / multi-layer structure.