JPH0213889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a pipe covering structure that crushes the pipe and prevents fire, smoke, etc. from passing through the pipe in the event of a fire or the like.

As is well known, buildings are equipped with conduits such as water and sewage pipes, electric wires, telephone wires, and other covered pipes, but in the event of a fire, fire, smoke, etc. can pass through the conduits, causing fire spread and smoke damage. It is very often the main cause of expansion.

The present invention aims to prevent the spread of fire and smoke damage caused by the above-mentioned pipes in the event of a fire, etc., and crushes the pipes using an expansion layer that expands due to high heat such as a fire. The main objective is to manufacture a pipe covering structure that can be used to cover pipes.

The present invention will be explained based on an embodiment shown in the drawings.

In FIG. 1, hopper 1A of extrusion molding machine 1
Then, a thermoplastic raw material 2 such as polyvinyl chloride, polyethylene, polypropylene, etc. is introduced and formed into a tubular body 3. The extruded tubular body 3 is cooled in a cooling tank 4 and moved in the direction of the arrow while being taken up by take-up rolls 5, 5. In step 1, the tubular body 3 is coated with a raw material paste 7A for an expansion layer on its outer periphery in a coating machine 6, which is to be expanded by heat applied from a hopper 6A of the coating machine 6. In step (2), the raw material paste 7A attached to the outer periphery of the tubular body 2 in the dryer 8
is dried by heating and ventilation to form an expanded layer 7. Needless to say, the heating temperature is lower than the expansion temperature of the expansion layer 7. In step (3), a substantially non-stretchable base material 9 is wrapped around the outer periphery of the expansion layer 7. The base material 9 is connected to the tubular body 3 as shown in FIG.
The base material 9 is pulled out from a roll 9A rotatably mounted on a trolley 11 that runs in a circular orbit 10 provided around the base material 9, and is wound around the outer periphery of the expansion layer 7. In step (4), the protective film forming material 14A is applied to the outer periphery of the base material 9 from the spray coating machines 13, 13 in the coating room 12. In step (5), the protective film 14 is formed by heating and ventilation drying in the dryer 15. Needless to say, the heating temperature is lower than the expansion temperature of the expansion layer 7. In this way, a pipe covering structure 16 consisting of the expansion layer 7, the base material 9, and the protective film 14 is formed around the outer periphery of the tubular body 3. As shown in FIG. 3, the pipe covering structure 16 may be formed partially on the tubular body 3.

In the present invention, the base material 9 may be metals such as iron, aluminum, or stainless steel, or fibers of these metals, ceramics such as alumina, silica, or zirconia, or other inorganic materials such as asbestos, rock wool glass, or carbon, or these inorganic materials. fibers,
It is made of a material that does not substantially expand or contract, such as a thin plate, sheet, net, woven or knitted fabric, or non-woven fabric made of organic material such as paper or plastics. The base material 9 should maintain the property of not substantially expanding or contracting at the temperature at which the expansion layer 7 expands, and it is also desirable that it does not emit harmful gases due to high heat during a fire. It is preferable to choose inorganic, non-combustible materials.

In the present invention, the raw material paste 7A for the expansion layer includes organic blowing agents such as azodicarbonamide and azobisisobutyronitrile, and inorganic foaming agents containing water of crystallization such as silicates, borates, sulfates, phosphates, and chromates. Compounds, lower fatty acid salts such as formates, acetates, and oxalates, carbonates, bicarbonates, alum, capsules of the above-mentioned organic blowing agents and organic solvents, etc. are decomposed by heat to produce nitrogen gas, water, and lower fatty acid salts. Mainly composed of substances that release gases such as fatty acids, carbon dioxide gas, and organic solvents, and in addition to the above substances, vinyl acetate resin, vinyl chloride resin, acrylic resin, methacrylic resin, styrene resin, polyethylene, polypropylene, fluororesin,
Acrylonitrile-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, styrene-butadiene copolymer, styrene-butadiene block copolymer, vinyl acetate-ethylene copolymer, urethane resin, urea resin, melamine resin, phenol resin , resorcinol resin, epoxy resin, polyamide, polyester, natural rubber, starch, polyvinyl alcohol, sodium alginate,
Emulsions, aqueous solutions, and organic solvent solutions of natural resins, synthetic resins, and semi-synthetic resins such as carboxymethyl cellulose, rosin, and petroleum resins are mixed and kneaded into a paste. Furthermore, if desired, calcium carbonate, titanium white, chrome yellow, carbon black, aluminum oxide, aluminum hydroxide, magnesium oxide, small magnesium oxide, gypsum, silica, alumina, zirconia, holsterite,
Fillers such as whitebait balloons, vermiculite, perlite, lime, borax, river sand, cement, and slag may be added. Furthermore, if desired, anti-aging agents, ultraviolet absorbers, flame retardants, and other additives may be added. In order to make the expansion layer raw material into a paste form, the above-mentioned organic blowing agents, inorganic blowing agents,
The weight ratio of the binder such as filler and the above binder is
Set it in the range of 100:3 to 100:30. The glass transition point of the resin constituting the binder is preferably 30.
℃ or less, more preferably 15℃ or less. Further, it is necessary that the expansion layer 7 starts expanding at high temperatures such as in the event of a fire, and it is desirable that the expansion layer 7 does not expand at all at high temperatures, such as in the summer. Therefore, the expansion start temperature of the expansion layer 7 should be at least 100°C or higher, preferably about 120°C or higher.

As the protective film 14, a material is used that is impermeable to gas and moisture, protects the expansion layer 7 from the outside world, and prevents deterioration. Such film forming materials include polyvinyl chloride, polyvinylidene chloride, acrylic resin, methacrylic resin, vinyl acetate resin, styrene resin, urethane resin, epoxy resin, polyester, ethylene-vinyl acetate copolymer, and styrene-butadiene copolymer. Examples include emulsions and solutions of synthetic resins such as agglomerates, acryloethryl-butadiene copolymers, and the like.

Specific examples preferable as pipe covering structure forming materials are shown above.

No.1 Base material: Stainless steel wire mesh Expanded layer Raw material paste: Water glass powder 100 parts by weight Acrylic resin emulsion (50% solids by weight)
30 Water glass liquid 15 parts by weight Protective film forming material: Polyethylene emulsion No. 2 Base material: Glass cloth expansion layer raw material paste: Potassium borate 100 parts by weight Styrene-butadiene copolymer latex (40% solids by weight) 15 Carboxymethyl cellulose 0.5 Water 10 Protective film forming material: Styrene-butadiene copolymer emulsion +
Vulcanizing agent No. 3 Base material: Aluminum thin film expansion layer raw material paste: Azobisisobutyronitrile 5 parts by weight Vinyl acetate resin emulsion 30 parts by weight Water glass powder 100 Aluminum hydroxide 100 Protective film forming material: Polyvinyl fluoride emul When the pipe covering structure 16 of the present invention is directly or indirectly exposed to flame during a fire or the like, the tubular body 3 softens and expands due to the high heat of the flame 17, as shown in FIG. The layer expands, but since the expansion layer 7 is restricted from expanding in the outer circumferential direction by the base material 9, it expands in the inner circumferential direction, that is, in the direction of crushing the tubular body 3. In this way, the portion extending from the wall 18 of the tubular body 3 is crushed and the conduit is blocked.

Since the present invention has the above-mentioned configuration, when the expansion layer covering the outer periphery of the pipe expands due to heat, it is restricted from expanding in the outer circumferential direction by the base material.
A pipe covering structure that expands in the inner circumferential direction, crushes the pipe, blocks the pipe, and reliably prevents fire and smoke from passing through the pipe can be manufactured easily and continuously. .

[Brief explanation of drawings]

FIG. 1 is a process diagram of an embodiment of the present invention, FIG. 2 is a front view of the base material wrapping process, FIG. 3 is a side view of a tubular body partially forming a pipe covering structure, and FIG. 4 FIG. 2 is a side cross-sectional view showing a state in which the pipe is crushed during a fire or the like. In the figure, 3... tubular body, 7A... expansion layer raw material paste, 7... expansion layer, 9... base material, 14A... protective film forming material, 14... protective film.

Claims (1)

[Claims] 1. Step of attaching a raw material paste for an expansion layer to be expanded by heat to the outer periphery of a tubular body made of thermoplastic plastic. 1. Drying and expanding the raw material paste attached to the outer periphery of the tubular body. Step 2 of forming a layer; Step 3 of wrapping a substantially non-stretchable base material around the outer periphery of the inflatable layer; Step 4 of applying a protective film forming material around the outer periphery of the base material; Drying the forming material applied to the outer periphery of the base material. Step 5 of forming a protective film using the above steps 1, 2, 3, 4, and 5. A method for manufacturing a pipe covering structure.