JPH073432Y2 - Fever sign - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a heat-generating sign board provided with a specific sheet-like heat generating sheet in which the temperature distribution of heat generation is uniform even when the size is increased.

<Prior Art> Usually, a signboard is mainly installed along a road and is used as a road sign indicating traffic prohibition, restriction, guidance, designation, or installed in a structure such as a building to advertise. It is used as a target signboard. Examples of the material used for the substrate of the marking plate include aluminum alloy plates, ordinary steel plates, steel plates such as anticorrosion treated steel plates, FRP (glass fiber reinforced plastic) plates, ABS resin plates, and synthetic resin plates such as polycarbonate plates. It is known and is used for various environments according to each characteristic.

These signboards must be legible in terms of their function and are often exposed directly to the outside air.Therefore, in cold regions, snowy areas, etc. However, there is a drawback that the desired visibility cannot be obtained due to the formation of snow or snow. Therefore, by placing a metal wire such as a nichrome wire inside the signboard or in an appropriate place and passing an electric current, it is possible to raise the temperature of the signboard itself and prevent icing, and it is also possible to melt the snow that has adhered Signs and billboards have been proposed.

However, in the signboard using this metal wire, the temperature distribution on the signboard surface is not uniform, and even if it is possible to partially prevent icing and snow from adhering, it is not possible to prevent it entirely and it is possible to partially freeze it. It has the drawback that it allows snow and snow to adhere to it, and it does not give the desired visibility.In addition, icicles form in some icy parts, and when sunshine is strong and the temperature rises, icicles fall and pedestrians and It also has the drawback of causing danger to automobiles and the like. In addition, in seasons other than winter when it is not necessary to generate heat, there is a drawback that the metal wire deteriorates or breaks due to long-term non-use or due to the intense heat of summer, and the heat generating function deteriorates, and the durability is also low. A problem arises.

Recently, as a heat generating sheet, a mixed heat generating sheet prepared by mixing carbon fiber and pulp has been proposed. However,
Since a conventional mixed paper heating sheet is made by using carbon fibers of uniform length, when the length is long, entanglement of fibers and cutting of fibers occur during the mixed paper, while the length of the fiber If it is short, sedimentation etc. will occur during water dispersion due to the problem of the specific gravity and shape of the carbon fiber, and especially when the size of the sheet itself is increased, it is difficult to disperse uniformly and the entire heat generating sheet heats up uniformly. I can't let you do it. Therefore, a problem similar to that of the above-mentioned heat-generating sheet using nichrome wire or the like occurs, and there is a problem that a signboard or the like having a large size cannot be used for heat generation.

<Problems to be Solved by the Invention> The object of the present invention is to have extremely stable temperature characteristics and mechanical strength even in cold regions, snowy regions, etc., and to prevent the adhesion of ice and snow. Another object of the present invention is to provide a heat generation sign board which has excellent durability even when it is not heated in summer.

<Means for Solving the Problems> According to the present invention, there is provided a marking plate comprising a carbon fiber-containing sheet heating sheet having a conductive metal foil and / or a conductive paste, wherein the carbon fiber-containing sheet heating is provided. Sheet, length
3 to 20% by weight of carbon fibers having substantially different length groups of 3 mm or more and less than 5 mm and carbon fibers having a length of 5 mm or more and 10 mm or less and 97 to 80% by weight of pulp were mixed. There is provided a heat generation sign board which is a mixed heat generation sheet in which a sheet is impregnated with a resin.

The present invention will be described in more detail below.

The heat-generating sign board of the present invention is characterized by including a specific sheet-like heat generating sheet having a conductive metal foil and / or a conductive paste and having extremely stable temperature characteristics.

The sheet-like heat generating sheet used in the present invention is a sheet which generates heat to a desired temperature with almost no temperature unevenness by passing a predetermined amount of electricity through a conductive metal foil body and / or a conductive paste. Specifically, a mixed paper sheet of carbon fiber such as polyacrylo-based carbon fiber and / or pitch-based carbon fiber and pulp, the carbon fiber having a length of 3 mm or more and less than 5 mm and the carbon fiber having a length of 5 mm or more and 10 mm or less. Of substantially two different length groups of carbon fibers are used. At this time, the blending ratio of the two types of carbon fibers of different length groups can be appropriately selected depending on the desired heat generation temperature, the size of the sheet, and the like. 2 like this
By using carbon fibers of different length groups,
Unlike the case of using the conventional single-length carbon fiber, the dispersibility at the time of papermaking can be improved, and stable temperature characteristics without temperature unevenness are exhibited regardless of the size of the heat-generating sheet. The thickness of the carbon fiber is not particularly limited, but is 4 to
10 μm, particularly preferably 6 to 8 μm.

As the pulp, vegetable pulp is preferable, and synthetic pulp can be added if necessary. The spot pulp, for example, wood fiber, seed hair fiber, bast fiber,
Preferable examples are leaf fiber, mosquito fiber and the like, and as raw material monomers for obtaining synthetic pulp, acrylonitrile, vinyl acetate, vinylidene chloride, (meth)
A monomer selected from the group consisting of acrylic acid or its ester, (meth) acrylamide, styrene, vinyl pyridine, vinyl monomer containing sulfone or its salt, allyl monomer containing sulfone or its salt, vinyl alcohol and mixtures thereof. Preferably. The thickness of the plant pulp and the synthetic pulp is preferably 100 μm or less, particularly preferably 10 to 80 μm.

The mixed paper sheet can be obtained by mixing and dispersing the carbon fiber and pulp and making a paper. The mixing ratio of the carbon fiber and the pulp is 3 to 20% by weight of carbon fiber,
It is preferably 8 to 12% by weight and 97 to 80% by weight of pulp. At this time, if the carbon fiber content is less than 3% by weight, the electric resistance becomes high and the desired exothermic temperature cannot be obtained. If it exceeds 20% by weight, the dispersion ratio becomes poor and stable electric resistance may not be obtained. It is not preferable because it exists.

In the present invention, in order to impart durability to various natural environments when it is provided on a sign board, a mixed paper exothermic sheet obtained by further impregnating the mixed paper sheet with a resin is used. The resin is not particularly limited as long as it is not thermally deformed by heat generation, and includes, for example, silicon resin, phenol resin, urea resin, melamine resin, polyester, epoxy resin, diallyl phthalate resin, vinyl chloride resin, polystyrene, SAN. Resin, ABS resin, methyl methacrylate resin, polypropylene, polyamide, polyacetal, polycarbonate, polyphenylene oxide, poly (4
-Methylpentene-1) and a resin selected from the group consisting of a mixture thereof are preferable.

The conductive metal foil body and / or the conductive paste provided in the sheet heat generating sheet may be conductive, and is selected from the group consisting of silver, aluminum, copper, nickel, stainless steel, a mixture thereof, and the like. Preferable examples of the metal foils or pastes are, for example, sticking to both sides of the sheet-like heat generating sheet, or sticking to both ends of the same side of the sheet-like heat generating sheet as normally used. You can The shape and size of the sheet-shaped heat generating sheet when attached to both sides are the same as those of the sheet-shaped heat generating sheet in order to obtain the effect of accumulating the heat of the sheet-shaped heat generating sheet. In particular, when using a conductive metal foil body, in order to prevent delamination between the sheet heat generating sheet and the conductive metal foil body, and to further efficiently transfer heat, the conductive metal foil body is preferably used. At least one of the above is preferably a conductive metal foil body having a plurality of holes. In order to prevent the delamination, for example, a method of impregnating a sheet-shaped heat generating sheet having a conductive metal foil body having a plurality of holes in at least one side with the resin that does not cause thermal deformation due to heat generation, etc. You can The thickness of the conductive metal foil and / or the conductive paste can be changed within the range of several μ to several mm as desired, but in order to make the sheet heating sheet flexible, The thickness is preferable. Further, the mixed sheet heat-generating sheet can be used, for example, after being coated with a covering material such as resin, woven cloth, non-woven cloth or synthetic fiber such as acrylic fiber or polyester fiber, which is not thermally deformed by the heat generation.

The sign board of the present invention is formed of, for example, resin or metal, and has the above-mentioned sheet heating sheet on the back surface thereof with a double-sided tape, adhesive,
It can be obtained by sticking with a magnet or bolts, or by embedding it inside the sign board.
At this time, it is desirable that the shape of the sheet-like heat generating sheet should be substantially the same size in accordance with the shape of the marking plate, and it is particularly preferable to install the sheet at the side end and the lower end.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.

In FIG. 1, reference numeral 1 is a road sign provided with a sign board 3 made of a hard vinyl chloride resin in which a sheet-like heat generating sheet 2 is embedded, and a column 7 supporting the sign board 3. A marking portion 4 formed of a reflection sheet is provided on the surface of the marking plate 3, and a mounting hook 5 for locking and fixing the marking plate 3 to a column 7 is provided on the upper portion of the marking plate 3. Is installed. The sheet heating sheet 2 embedded in the sign board 3 has a length of 3 mm.
A carbon fiber having a length of 5 mm or less and a carbon fiber having a length of 5 mm or more and 10 mm or less, which is a mixed sheet of carbon fibers and pulp of two substantially different length groups, and both sides of the mixed sheet. As shown in FIG. 2, a conductive metal foil body 20 made of copper having a plurality of holes 21 is attached and further impregnated with a resin (not shown). Each of the conductive metal foil bodies 20 is provided with a power supply cable 22 provided with a current-carrying terminal and a temperature control device (not shown).
It passes through the inside of the pillar 7 shown in FIG. 1 and is connected to an underground cable (not shown). Therefore, when the electric current is passed through the power cable 22, the sheet heat generating sheet 2 generates heat, and the sign board 3 can be uniformly heated to a desired temperature. The heat generation temperature of the sheet heat generating sheet 2 may be the heat generation temperature of the signboard 3 as long as it can prevent ice and snow from adhering, for example, +
The purpose can be achieved by setting the temperature to about 0.5 ° C. Further, the planar heat generating sheet 2 does not have to be constantly heated, and a temperature sensor or the like can be attached to control the temperature.

FIG. 3 shows another embodiment of the present invention in which a sheet heating sheet 30 is provided on the entire back surface of the marking plate 33 made of metal.
The sign 32 is attached with an adhesive.

The signboard 30 is bolted and fixed to the building 35 by two columns 34. On both sides of the sheet heating sheet 32, the second
The conductive metal foil body shown in the figure is attached, and by applying an electric current to the sheet heat generating sheet 32, it is possible to prevent the adhesion of ice and snow.

<Effect of the Invention> Since the heat generation signboard of the present invention is provided with a mixed heat generation sheet of carbon fiber and pulp of two kinds of substantially different specific length groups, temperature unevenness can be obtained by applying a predetermined voltage. It is possible to heat the entire road sign or signboard using the signboard evenly without generating heat, and to prevent freezing and adhesion of snow. Therefore, since icicles and snow can be prevented, visibility of marking portions such as road signs and billboards can be ensured, and pedestrians and running vehicles can be avoided from dangers due to icicles and snowfall. Further, since the mixed heat-generating sheet is impregnated with resin, it exhibits excellent durability even under various changes in the natural environment.

[Brief description of drawings]

FIG. 1 is a partially transparent perspective view showing a road sign using the heat generation sign plate of the present invention, FIG. 2 is an exploded perspective view of a sheet heat generating sheet used in an embodiment, and FIG. 3 is a perspective view of the present invention. It is a partially transparent perspective view which shows the signboard using the heat generation sign board. 1 ... Road sign, 2,22,32 ... Sheet heating sheet, 3,33 ...
… Marking plate, 20… Conductive metal foil body.

Claims (1)

[Scope of utility model registration request] 1. A signboard comprising a carbon fiber-containing sheet heating sheet having a conductive metal foil and / or a conductive paste, wherein the carbon fiber sheet heating sheet has a length of 3 mm.
The carbon fibers of substantially two different length groups, that is, carbon fibers having a length of 5 mm or more and carbon fibers having a length of 5 mm or more and 10 mm or less 3
A heat-generating sign board, which is a mixed heat-generating sheet obtained by impregnating a sheet obtained by mixing 20% by weight to 97% by weight of pulp with resin.