JP2008047460A - Sheet for illumination adjuster and illumination adjuster using that sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet for illumination adjuster and an illumination adjuster which have a high fire retardancy meeting flameproof acceptance standards of Fire Protection Law, Enforcement Regulations Article 4-3, Section 3 and excellent thermal resistance against radiant heat by illumination, and are provided with excellent handling workability and punching moldability. <P>SOLUTION: The sheet for illumination adjuster is a sheet obtained by wet type paper-making of a raw material slurry containing a flame resistant hardly dissolved in water, an inorganic hydrate and/or carbonate, and a cellulose fiber, and these additives are distributed in whole thickness direction in the sheet. The content of the inorganic hydrate and/or carbonate is 35-75 mass% in solid content, the content of the cellulose fiber is 20-60 mass% in solid content, and the content of the flame resistant is 2-15 mass%, and the lightness index L* on the sheet surface by L*a*b* surface color system of JIS Z 8730:1995 is 65 or less. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting adjustment tool sheet and a lighting adjustment tool using the sheet, and more specifically, can be used as a lighting frame sheet and a lighting frame using the sheet, or unnecessary portions are light. It can be used as an illumination adjustment tool such as an illumination adjustment frame that can shield light and illuminate only necessary places, has high flame resistance, and has excellent heat resistance against radiant heat from illumination light The present invention relates to a lighting adjustment tool sheet and a lighting adjustment tool including a punched molded body of the sheet.

  When using lighting such as spotlights at photo shooting sites, studios, stages, etc., conventionally, lighting frames are attached to lighting fixtures to prevent unnecessary light diffusion and efficiently illuminate illumination light in the desired direction. That is done. As such an illuminating frame, generally a cardboard punched and formed is used. In addition, since the illumination device used in photography, studio, stage, etc. should be as inconspicuous as possible, the illumination frame is usually colored black.

  However, the lighting frame made of cardboard is made of combustible cardboard and is colored black, so it easily absorbs the radiant heat of illumination light emitted from lighting such as spotlights and emits smoke. There is a high risk of fire or fire.

  Therefore, in order to prevent the risk of flames on the lighting frame made of cardboard, in the past, the present inventor has studied a method of including a flame retardant, but by adding a flame retardant to the sheet for lighting adjustment tools, the flame retardant is included. (For example, in the column of “Problems to be Solved by the Invention” in Patent Document 1, it has been reported that the study has been unsuccessful. Guanidine sulfamate-based difficulty described later has been reported. (See also Comparative Example 7 impregnated with a flame retardant.) In the first place, flame retardants are included for the purpose of preventing flames during high-temperature heating such as in a fire, or suppressing or extinguishing combustion when they are lit, but in harsh environments such as receiving radiant heat during normal use. It is not expected to be exposed. If used as a lighting frame, the cardboard lighting frame naturally receives a range of heat, but at this time, the contained flame retardant decomposes due to the radiant heat from the lighting, producing smoke. The carbon fiber promotes carbonization, and as a result, the paper quality deteriorates. Therefore, the strength required for the lighting frame cannot be maintained by the method of simply adding the flame retardant. Therefore, in order to solve such difficulties, the present inventor proposed a sheet that can be used as a lighting adjustment tool without using a flame retardant so as not to cause smoke and paper quality deterioration due to the flame retardant. Went in.

JP 2000-276923 A

  In Patent Document 1, flame retardancy and heat resistance against radiant heat by illumination are obtained by containing a relatively high amount of a water-containing inorganic compound and a carbonate at a specific blending ratio without containing a flame retardant having an effect of promoting the carbonization of cellulose. The technique of aiming at coexistence of sex is disclosed. However, there is an even stronger demand for performance improvement in such fields, and there is a higher degree of flame retardancy, that is, flame retardancy that meets the flameproof acceptance criteria of Article 4-3, Paragraph 3 of the Fire Service Act Enforcement Regulations. It has been demanded. In order to ensure such flame retardancy, if the blending amount of the hydrous inorganic compound and carbonate is further increased, the cellulose fiber in the sheet becomes excessive, the sheet strength is greatly reduced, and the handling workability is inevitably deteriorated. Further, the punch formability is remarkably deteriorated and cannot be put to practical use.

  Therefore, an object of the present invention is to obtain a high flame retardance that meets the flameproof acceptance criteria of Article 4-3, Paragraph 3 of the Fire Service Act Enforcement Regulations in the lighting adjustment tool sheet and the lighting adjustment tool. A flame retardant is contained, but this flame retardant does not cause fuming and paper quality deterioration, imparts excellent heat resistance against radiant heat from illumination, and has good handling workability and punching moldability.

The sheet for lighting adjustment tool according to the present invention is a sheet obtained by wet papermaking a raw material slurry containing a flame retardant that is hardly soluble in water, a water-containing inorganic compound and / or carbonate, and cellulose fiber,
The flame retardant, the water-containing inorganic compound and / or the carbonate, and the cellulose fiber is distributed throughout the thickness direction in the sheet,
The content of the water-containing inorganic compound and / or the carbonate in the sheet is 35 to 75% by mass in solid content,
The content of the cellulose fiber in the sheet is 20 to 60% by mass in solid content,
The flame retardant content in the sheet is 2 to 15% by mass in solid content, and
JIS Z 8730: 1995 - lightness index ^L * ^a * ^{b *} sheet surface by color system "color display method of the color difference of the object color" ^{L *} is equal to or is 65 or less.

  In the sheet | seat for lighting adjustment tools which concerns on this invention, it is preferable that the thickness of the said sheet | seat is 0.3-3 mm. It becomes easy to ensure sufficient punching moldability and mechanical strength.

  In the sheet | seat for lighting adjustment tools which concerns on this invention, it is preferable that the decomposition temperature of the said flame retardant is 300 degreeC or more. It becomes easy to ensure sufficient heat resistance against radiant heat by illumination.

  In the sheet for lighting adjustment tool according to the present invention, the flame retardant is preferably at least one selected from a melamine phosphate flame retardant and a melamine sulfate flame retardant. Even if the melamine phosphate flame retardant and / or the melamine sulfate flame retardant is contained in the raw material slurry and wet papermaking, it hardly dissolves and is uniformly dispersed inside the sheet. The decomposition temperature of the guanidine sulfamate flame retardant is as low as about 230 ° C., whereas the decomposition temperature of the melamine phosphate flame retardant is about 390 ° C., and the decomposition temperature of the melamine sulfate flame retardant is about 350 ° C. In addition, since these flame retardants have a high decomposition temperature, they have excellent heat resistance against radiant heat from illumination.

  In the sheet | seat for lighting adjustment tools which concerns on this invention, it is preferable that solid content mass ratio of the said water-containing inorganic compound and the said carbonate is 100 / 0-50 / 50. It becomes easy to ensure more sufficient flame retardance and heat resistance.

  In the sheet for lighting adjustment tool according to the present invention, the water-containing inorganic compound may be at least one selected from aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate gypsum and calcium aluminate. preferable. This is because these hydrous inorganic compounds are decomposed when heated at a high temperature and exhibit a flame-retarding effect by an endothermic action.

  In the sheet for lighting adjustment tool according to the present invention, the carbonate is preferably calcium carbonate. This is because calcium carbonate decomposes during high-temperature heating and exhibits a flame-retarding effect by an endothermic effect, and also exhibits a smoke generation amount reducing effect.

In the sheet for lighting adjustment tool according to the present invention, in accordance with the 45 ° Meckel burner method defined in Article 4-3, Paragraph 4 of the Fire Service Enforcement Regulations, the carbonization area is 40 cm ² or less in the 2-minute heating test. It preferably has flame retardancy satisfying a flame time of 5 seconds or less and a residual time of 20 seconds or less.

  In the sheet for lighting adjustment tool according to the present invention, the smoke generated from the sheet is slightly or hardly generated when a 500 W spotlight for photography is irradiated for 60 seconds from the vicinity of 5 cm, and the sheet after irradiation It is preferable to have heat resistance satisfying that almost no deterioration is observed.

  The illumination adjustment tool according to the present invention is characterized by comprising a punched molded body of the illumination adjustment tool sheet according to the present invention.

  In order to obtain a highly flame retardant that conforms to the flameproof acceptance standards of Article 4-3, Paragraph 3 of the Fire Service Act Enforcement Regulations, the sheet for lighting adjustment tool according to the present invention and the lighting adjustment tool of the present invention, Although a flame retardant is contained, the flame retardant does not cause smoke and paper quality, and has excellent heat resistance against radiant heat from illumination, and also has good handling workability and punching moldability. In addition, when the lighting frame using the sheet for lighting adjustment tool according to Patent Document 1 previously proposed by the present inventor was used for a long time, the lighting frame did not ignite due to radiant heat due to lighting. As a result, a red hot state was sometimes exhibited. On the other hand, the sheet for lighting adjustment tool according to the present invention and the lighting adjustment tool according to the present invention pass the flameproof acceptance standard stipulated in Article 4-3, Paragraph 3 of the Fire Service Law Enforcement Regulations, that is, the remaining time ( (Red-hot state) Since 20 seconds or less are satisfied, it is possible to avoid a red-hot state even when the lighting frame is used for a long time.

The lighting adjuster sheet according to the present embodiment is a sheet obtained by wet papermaking a flame retardant that is hardly soluble in water, a hydrous inorganic compound and / or carbonate, and a raw material slurry containing cellulose fiber, The flame retardant, the water-containing inorganic compound and / or the carbonate, and the cellulose fiber are distributed throughout the thickness direction in the sheet, and the content of the water-containing inorganic compound and / or the carbonate in the sheet is The solid content is 35 to 75 mass%, the cellulose fiber content in the sheet is 20 to 60 mass% in solid content, and the flame retardant content in the sheet is 2 to 15 solid content. is the mass%, and, JIS Z 8730: 1995 - "display method of color chrominance object color" ^L * ^a * ^{b *} lightness of the sheet surface by the color system ^{L *} is 65 or less. Moreover, the illumination adjustment tool which concerns on this invention is a stamping molding of the sheet | seat for illumination adjustment tools which concerns on this embodiment.

  The sheet for lighting adjustment tool according to the present embodiment is a sheet obtained by wet papermaking with a raw material slurry containing a flame retardant hardly soluble in water. The flame retardant can be distributed throughout the thickness direction in the sheet by the combination of the use of a flame retardant hardly soluble in water and the adoption of the wet papermaking method. In order to give the flame retardant conforming to the flameproof acceptance criteria of Article 4-3, Paragraph 3 of the Fire Service Law Enforcement Regulations, to the lighting adjuster sheet targeted by the present invention, Considering the harsh usage environment of continuing to receive radiant heat at the time of use, it was found that the method of externally adding a flame retardant is unsuitable, and that flame retardant properties that are as uniform as possible in the thickness direction of the sheet are required. Therefore, as described above, a flame retardant is internally added to the sheet. At this time, a flame retardant can be uniformly disperse | distributed in a sheet | seat by using a flame retardant hard to water without using a water-soluble flame retardant. In particular, a thick sheet is often used for a lighting adjuster sheet in order to ensure the mechanical strength of the sheet. In this case, it is significant to internally add a flame retardant that is hardly soluble in water. That is, when a water-soluble flame retardant is externally added, the flame retardant is unevenly distributed in the surface layer portion of the sheet, making it difficult to contain a sufficient flame retardant in the core portion. In this case, in the 2-minute heating test according to the 45 ° Meckel burner method stipulated in Article 4-3, Paragraph 4 of the Fire Service Act Enforcement Regulations, the remaining time is Article 4-3, Paragraph 3 of the Fire Act Enforcement Regulations. It will not be possible to meet the standards for passing fire prevention. On the other hand, when a flame retardant that is hardly soluble in water is internally added, an appropriate amount of the flame retardant can be uniformly contained in the entire thickness direction of the sheet. In this case, neither smoke nor paper quality deterioration occurs even in a harsh use environment in which radiant heat from the lighting fixture is continuously received during use. A sheet having high heat resistance against radiant heat caused by illumination and having high flame retardancy that meets the flameproof acceptance criteria of Article 4-3, Paragraph 3 of the Fire Service Law Enforcement Regulations is obtained.

Examples of the hydrous inorganic compound include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate gypsum, calcium aluminate (xCaO · Al ₂ O ₃ · yH ₂ O; x = 1 to 4, y = 5 to 5). 19), which are used alone or in combination of two or more. Each of these compounds has crystal water in the molecule and a chemically similar structure. In addition, the hydrous inorganic compounds have some differences in decomposition temperature and endothermic amount depending on the type, but they are quite common in that they decompose upon high temperature heating and exhibit a flame retardant effect by endothermic action. Therefore, basically any of the above-mentioned water-containing inorganic compounds may be used, but aluminum hydroxide is optimal in view of economics such as an acquisition price.

Examples of the carbonate include calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, beryllium carbonate, and zinc carbonate, and these are used alone or in combination of two or more. Although these carbonates have some differences in decomposition temperature and endothermic amount depending on their types, they are quite common in that they decompose upon high temperature heating and exhibit a flame retardant effect due to endothermic action. Therefore, basically, any of the above-mentioned carbonates may be used, but calcium carbonate is optimal in view of economics such as an acquisition price. In addition, the smoke generation amount reduction effect which this inventor pointed out in patent document 2 can be mentioned as another important effect by carbonate mixing | blending.
JP-A-5-112659

  The content range of the water-containing inorganic compound and / or carbonate in the sheet of the lighting adjuster sheet according to the present embodiment is 35 to 75% by mass in terms of solid content. Preferably it is 40-70 mass%, More preferably, it is 45-65 mass%. If the content is less than 35% by mass, sufficient flame retardancy and heat resistance cannot be obtained. On the other hand, when it exceeds 75% by mass, it is unsuitable because sufficient stamping moldability, mechanical strength, etc. cannot be obtained due to the excessive amount of the water-containing inorganic compound and / or carbonate. In addition, sufficient flame retardancy, heat resistance, punching moldability, mechanical strength, etc. by setting the content range of the hydrous inorganic compound and / or carbonate in the sheet to a range of 40 to 70% by mass in solid content It becomes easy to ensure sufficient flame retardance, heat resistance, punching moldability, mechanical strength, etc. by making it the range of 45-65 mass%.

  Moreover, it is preferable that the content mass ratio of the hydrated inorganic compound / carbonate is on the excess side of the hydrated inorganic compound with respect to the solid content of 50/50. By setting the content ratio of the water-containing inorganic compound / carbonate to the excess of the water-containing inorganic compound with respect to the solid content of 50/50, sufficient flame retardancy and heat resistance can be easily secured.

  As the above-mentioned cellulose fiber, one or two or more kinds selected from wood pulp such as softwood or hardwood chemical pulp, mechanical pulp, semi-chemical pulp, cotton pulp, hemp pulp, various waste paper pulp, etc. are used in combination. May be. Wood pulp is the most easy-to-use cellulose fiber material because of its stable supply and quality and relatively low price. Cotton pulp and hemp pulp are unstable in supply and expensive in price. However, in a sheet containing a large amount of an endothermic decomposable inorganic compound as in the present invention, cotton pulp or hemp is necessary. By using the pulp, it is possible to minimize a decrease in the sheet punchability and mechanical strength.

  The content range of the cellulose fiber in the sheet | seat which concerns on this embodiment is 20-60 mass% by solid content, Preferably it is 25-55 mass%, More preferably, it is 30-50 mass%. If the content is less than 20% by mass, sufficient punching moldability, mechanical strength and the like cannot be obtained due to the shortage of cellulose fibers. On the other hand, if the content exceeds 60% by mass, the organic substance is excessive. Insufficient flame retardancy and heat resistance cannot be obtained. In addition, it becomes easy to ensure sufficient flame retardance, heat resistance, stamping moldability, mechanical strength, etc. by making the content rate of the cellulose fiber in a sheet into the range of 25-55 mass% by solid content, 30 By setting it in the range of ˜50 mass%, it becomes easy to ensure sufficient flame retardancy, heat resistance, punching moldability, mechanical strength, and the like.

  As a flame retardant hardly soluble in water, the solubility in pure water at 20 ° C. and 100 g is 5 g or less, preferably 1 g or less, and the form is preferably solid or emulsion. For example, an ammonium phosphate flame retardant or a phosphate amide flame retardant can be used, but at least one selected from a melamine phosphate flame retardant and a melamine sulfate flame retardant is preferable. Even if the melamine phosphate flame retardant and / or the melamine sulfate flame retardant is contained in the raw material slurry and wet papermaking, it hardly dissolves and is uniformly dispersed inside the sheet. The decomposition temperature of the guanidine sulfamate flame retardant is as low as about 230 ° C., and the decomposition temperature of the ammonium phosphate flame retardant and the phosphoric acid amide flame retardant is less than 300 ° C., whereas the melamine phosphate The decomposition temperature of the flame retardant is about 390 ° C., and the decomposition temperature of the melamine sulfate flame retardant is about 350 ° C. Since these flame retardants have a high decomposition temperature, they have excellent heat resistance against radiant heat from illumination. Here, the flame retardant hardly soluble in water is preferably a powdered flame retardant, and the average particle size of the powder is preferably 0.1 to 50 μm, more preferably 0.5 to 30 μm. It is. If the thickness is less than 0.1 μm, handling becomes difficult, and if it exceeds 50 μm, dispersibility may be reduced, and sufficient flame retardancy may not be obtained, or mechanical strength may be reduced. By using a powdery flame retardant, it can be more uniformly dispersed inside the sheet, so the amount of flame retardant added can be reduced, and sufficient heat resistance against radiant heat from lighting is ensured. It becomes easy to do. The content range of the flame retardant hardly soluble in water in the sheet according to the present embodiment is 2 to 15% by mass, preferably 2 to 12% by mass, and more preferably 3 to 10% by mass in terms of solid content. If the content is less than 2% by mass, sufficient flame retardancy cannot be obtained. Conversely, if the content exceeds 15% by mass, heat resistance, punching moldability, mechanical strength, etc. are likely to be hindered. Become. In addition, ensuring sufficient flame retardancy, heat resistance, punching moldability, mechanical strength, etc. by setting the content of the flame retardant that is hardly soluble in water in the sheet to a range of 2 to 12% by mass in solid content It becomes easy to ensure, and it becomes easy to ensure sufficient flame retardance, heat resistance, punching moldability, mechanical strength, etc. by setting it as the range of 3-10 mass%. In addition, the measuring method of the average particle diameter of a flame retardant is a laser diffraction method.

The flame retardancy of the sheet for lighting adjustment tool according to the present embodiment is determined by the carbonized area in a 2-minute heating test according to the 45 ° Meckel burner method defined in Article 4-3, Paragraph 4 of the Fire Service Act Enforcement Regulations. It is preferable to satisfy 40 cm ² or less, a residual flame time of 5 seconds or less, and a residual dust time of 20 seconds or less.

  Moreover, in the sheet | seat for lighting adjustment tools concerning this embodiment, it has durability with respect to the radiant heat of a lighting fixture. The heat resistance of the sheet for lighting adjustment tool according to the present embodiment is such that little or no smoke is generated from the sheet when a 500 W spotlight for photography is irradiated from the nearest 5 cm for 60 seconds, and It is preferable that deterioration of the sheet after irradiation is hardly observed.

JIS Z of the sheet for lighting adjustment tool according to the present embodiment 8730: 1995 - "Display method of color chrominance object color" ^L * ^a * ^{b *} lightness color system by the seat surface ^{L *} is 65 or less Yes, preferably 60 or less, more preferably 55 or less. When L ^* exceeds 65, reflection and diffusion of illumination light tends to occur, which is not preferable. In addition, the illumination adjustment tool and the illumination device made of such a sheet are not preferable because they are easily visible and stand out. On the other hand, by setting the lightness index L ^* of the sheet surface to 60 or less, it becomes easier to prevent reflection and diffusion of illumination light. Moreover, it becomes easy to ensure the characteristic that it is hard to see and is not conspicuous, and by making the lightness index L ^* of the sheet surface not more than 55, it becomes easier to prevent reflection and diffusion of illumination light. Furthermore, it becomes easy to ensure the characteristic that it is hard to see and is not conspicuous.

  The thickness of the lighting adjuster sheet according to this embodiment is preferably 0.3 to 3 mm, more preferably 0.5 to 2.5 mm, still more preferably 1.0 to 2.5 mm, and most preferably 1 The range is from 5 to 2.2 mm. If the thickness is less than 0.3 mm, sufficient mechanical strength cannot be obtained as a lighting adjustment tool. On the other hand, when the thickness exceeds 3 mm, it is difficult to perform punching molding, which is not preferable. On the other hand, when the thickness of the sheet is in the range of 0.5 to 2.5 mm, it becomes easy to ensure sufficient punching formability and mechanical strength. Furthermore, it becomes easy to use as a sheet | seat for lighting adjustment tools by making thickness of a sheet into the range of 1.0-2.5 mm, and also 1.5-2.2 mm.

  A wet papermaking method is used as a method for manufacturing the sheet for lighting adjustment tool according to the present embodiment. Next, further details will be described with reference to the manufacturing method.

  That is, in order to manufacture the sheet for lighting adjustment tool according to the present embodiment, a raw material slurry containing a predetermined amount of a flame retardant that is hardly soluble in water, a water-containing inorganic compound and / or carbonate, and cellulose fibers is prepared. However, it may be made by a normal paper making method. As a method of incorporating the hydrated inorganic compound and / or carbonate, a method of applying or impregnating a coating material containing the hydrated inorganic compound and / or carbonate to the substrate is also conceivable, but a predetermined content is ensured. In order to make the quality uniform in the thickness direction, the method of internally adding the hydrated inorganic compound and / or carbonate in the raw material slurry in the form of powder or slurry is most preferable. Moreover, the addition order of a flame retardant, water-containing inorganic compound, carbonate, and cellulose fiber which are hardly soluble in water is arbitrary, and the cellulose fiber may be subjected to beating treatment or the like as necessary.

  For papermaking, the raw material slurry may be supplied on a papermaking net such as a long net, a circular net, or an inclined net, filtered and dehydrated, and then compressed and dried. If necessary, two or more sheet layers may be superposed using various combination nets, multi-circular nets, various laminators, and the like.

The sheet | seat for lighting adjustment tools which concerns on this embodiment must be colored in order to make the lightness index L ^{* of the} surface 65 or less. When coloring, a black pigment such as carbon or graphite or a black dye may be internally added to the raw slurry, or impregnated or coated after forming a paper layer.

  Further, the raw slurry may contain various yield improvers for improving the yield of the water-containing inorganic compound and / or carbonate and the flame retardant that is hardly soluble in water. Furthermore, the sheet for lighting adjustment tool according to the present embodiment, if necessary, various inorganic fibers such as glass fiber, rock wool fiber, ceramic fiber, various synthetic fibers such as nylon fiber, polyester fiber, polyolefin fiber or dry Alternatively, various auxiliary agents such as a wet paper strength enhancer, a sizing agent, a water resistant agent, and a water repellant may be appropriately combined. And an illumination adjustment tool can be easily manufactured by giving the conventional punching shaping | molding to the sheet | seat for illumination adjustment tools which concerns on this embodiment.

Next, the present invention will be more specifically described based on the following examples, but the present invention is not limited thereto. The measurement of each item in the present example was performed by the following method.
(1) Basis weight of sheet: Conforms to JIS P 8124: 1998 “Paper and board—Method of measuring basis weight”.
(2) Sheet thickness: Conforms to JIS P 8118: 1998 “Paper and paperboard—Test method for thickness and density”.
(3) Sheet density: Conforms to JIS P 8118: 1998.
(4) Tensile strength of sheet: Conforms to JIS P 8113: 1998 “Paper and paperboard—Test method of tensile properties”. When there was fiber orientation, it measured about the fiber orientation direction and the direction which makes a right angle to this, and calculated | required the average of both.
(5) Sheet lightness index L ^* : According to JIS Z 8730: 1995 “Color Display Method—Color Difference of Object Color”. A D65 light source, 10 degree field of view was applied.
(6) Flame retardancy of sheet 1: Evaluation was performed as follows according to the combustion state when the test piece was subjected to an indirect flame for 10 seconds according to the vertical combustion test of UL94 standard.
A: Does not ignite.
○: Fires, but self-extinguishes without reaching the clamp flame.
X: The flame is ignited, the self-extinguishing does not occur, the clamp flame is reached, and it is not practical.
(7) Flame retardance of sheet 2: As shown in FIG. 1, a 500 W spotlight 2 for photography is turned on, and a sheet 1 as a 6 cm square test piece is placed at a distance of about 5 cm from the spotlight 2. It is installed vertically, and the light beam 3 of the spotlight 2 is irradiated to the sheet 1 as the test piece. When irradiated for 30 seconds, the flame of the lighter 4 adjusted to about 20 mm length as shown in FIG. During this time, the irradiation of the light beam 3 of the spotlight 2 continues. Evaluation was performed as follows according to the combustion state of the sheet 1 as the test piece at this time.
A: Does not ignite.
○: Flames but self-extinguishes without burning.
X: Flame is applied, self-extinguishing does not occur, and it burns down and cannot be practically used.
(8) Flame retardance of the sheet 3: In accordance with the 45 ° Meckel burner method specified in Article 4-3, Paragraph 4 of the Fire Service Act Enforcement Regulations, the carbonization area, afterflame time and remaining The dusting time was measured and evaluated by the following “pass / fail”.
-Carbonization area ( ^double- circle): 20 cm < ² > or less.
○: More than 20 cm ² and 40 cm ² or less.
X: It exceeds 40 cm < ² >.
-Afterflame time A: 0 seconds (no afterflame).
○: 5 seconds or less.
X: Over 5 seconds.
-Residual dust time A: 0 seconds (no residual dust).
○: 20 seconds or less.
X: Over 20 seconds.
- pass / fail if: carbide area, 3 third term of reference of any Fire Service Law Enforcement Regulations Article 4 of the remaining flame time and afterglow time (carbonized area 40 cm ² or less, after flame time of 5 seconds or less, afterglow time 20 seconds or less).
Not: carbide area, 3 third term of reference of the Fire Service Law Enforcement Regulations Article 4 any one of the after-flame time and afterglow time (carbonized area 40 cm ² or less, after flame time of 5 seconds or less, afterglow time 20 Some are not compatible with
(9) Heat resistance of the sheet: As shown in FIG. 1, a 500 W spotlight 2 for photography was turned on, and a 6 cm square test piece was vertically installed at a distance of about 5 cm from the spotlight 2. The light beam 3 of the spotlight 2 is irradiated to the sheet 1 which is the test piece for 60 seconds, and the amount of smoke emitted from the sheet 1 which is the test piece during this period and the deterioration state of the sheet 1 which is the test piece after the test are visually observed. And evaluated as follows.
A: Almost no smoke is generated, and almost no deterioration is observed.
○: Smoke is slightly observed, but almost no deterioration is observed.
(Triangle | delta): There is considerable smoke generation, deterioration is recognized, and it cannot endure practical use.
X: There is a large amount of smoke, deterioration is considerably recognized, and it is not practical.
XX: There is a larger amount of smoke, deterioration is noticeable, and it is not practical.
(10) Punching formability of sheet: A punching molding test of the shape shown in FIG. 3 was conducted and evaluated as follows.
A: Almost no paper dust is generated.
○: A small amount of paper dust is generated.
X: Paper dust is generated so much that it is not practical.
XX: The generation of paper dust is remarkably large and cannot be practically used.

(Example 1)
In a cellulose fiber dispersion having a solid mass ratio of newspaper waste paper: craft waste paper = 50: 50 obtained by mixing and disaggregating waste newspaper and kraft waste paper with a disaggregator, aluminum hydroxide powder (average particle size 5.7 μm) The same shall apply hereinafter.), Calcium carbonate powder (average particle size of 1.5 μm, the same shall apply hereinafter), melamine phosphate flame retardant (average particle size of 2 to 5 μm, decomposition temperature of about 390 ° C., 20 ° C. The amount dissolved in 100 g of water is 0.01 to 0.05 g. The same applies hereinafter.), Liquid carbon and an acrylamide paper strength enhancer are added, and after sufficiently dispersed and mixed, the paper is made with a square test paper machine. The sheet A was obtained by pressing and drying. For sheet A, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Example 2)
In Example 1, Sheet B was obtained in the same manner as in Example 1 except that calcium carbonate powder was not blended. Regarding the sheet B, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Example 3)
In Example 1, a sheet C was obtained in the same manner as in Example 1 except that magnesium hydroxide powder (average particle size of 10 μm; the same applies hereinafter) was used instead of aluminum hydroxide powder. . Regarding the sheet C, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

Example 4
In Example 1, a sheet D was obtained in the same manner as in Example 1 except that the aluminum hydroxide powder was not blended. Regarding the sheet D, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Example 5)
A cellulose fiber dispersion having a solid mass ratio of newspaper waste paper: craft waste paper = 50: 50 obtained by mixing and separating waste paper and kraft waste paper with a pulper, aluminum hydroxide powder, calcium carbonate powder, phosphoric acid Add melamine flame retardant, liquid carbon and acrylic amide paper strength enhancer, thoroughly disperse and mix, then feed on long papermaking net to form paper layer, wind up to predetermined thickness with windup roll After that, the sheet E was cut, squeezed, dried, and calendared. For sheet E, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Example 6)
In Example 5, Sheet F was obtained in the same manner as in Example 5 except that the amount of each component was changed. Regarding the sheet F, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardance 2, flame retardancy 3, heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 1)
In Example 1, sheet G was obtained in the same manner as Example 1 except that aluminum hydroxide powder, calcium carbonate powder, and melamine phosphate flame retardant were not blended. Regarding the sheet G, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 2)
In Comparative Example 1, Sheet H was obtained in the same manner as Comparative Example 1 except that liquid carbon was not blended. Regarding the sheet H, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 3)
In Example 1, Sheet I was obtained in the same manner as in Example 1 except that no melamine phosphate flame retardant was added. Regarding the sheet I, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 4)
In Example 1, Sheet J was obtained in the same manner as in Example 1 except that the blending amount of the melamine phosphate flame retardant exceeded the range specified in the present invention. For sheet J, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 5)
In Example 1, the total blending amount of the aluminum hydroxide powder and the calcium carbonate powder is made too small exceeding the range specified in the present invention, while the blending amount of the cellulose fiber is excessive exceeding the range specified in the present invention. A sheet K was obtained in the same manner as in Example 1 except that. Regarding the sheet K, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 6)
In Example 1, the melamine phosphate flame retardant is not blended, and the total blending amount of the aluminum hydroxide powder and the calcium carbonate powder exceeds the range specified in the present invention, while the cellulose fiber A sheet L was obtained in the same manner as in Example 1 except that the blending amount was too small beyond the range specified in the present invention. Regarding the sheet L, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, heat resistance The punching moldability was measured, and the results are shown in Table 1.

(Comparative Example 7)
Liquid carbon and acrylic amide paper strength enhancer added to cellulose fiber dispersion with a solid mass ratio of newspaper waste paper: craft waste paper = 50: 50 obtained by mixing and disaggregating waste newspaper and kraft waste paper with a disaggregator Then, after sufficiently dispersing and mixing, the sheet obtained by paper making with a square test paper machine, squeezing and drying is a guanidine sulfamate flame retardant (aqueous liquid product, decomposition temperature is about 230 ° C. The same applies hereinafter. ) And then dried to obtain a sheet M. Here, the guanidine sulfamate flame retardant was externally added. About M, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardancy 3, heat resistance and The punching moldability was measured, and the results are also shown in Table 1.

(Comparative Example 8)
A cellulose fiber dispersion with a solid mass ratio of newspaper waste paper: craft waste paper = 50: 50 obtained by mixing and disaggregating waste newspaper and kraft waste paper with a disaggregator, aluminum hydroxide powder, calcium carbonate powder, liquid After adding carbon and acrylic amide paper strength enhancer, fully dispersing and mixing, paper making with square test paper machine, pressing and drying, impregnated with guanidine sulfamate flame retardant, The sheet N was obtained by drying. Here, the guanidine sulfamate flame retardant was externally added. Regarding the sheet N, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, lightness index L ^* , flame retardance 1, flame retardancy 2, flame retardance 3, and heat resistance The punching moldability was measured, and the results are shown in Table 1.

  Comparative Examples 1 and 2 mainly consist of cellulose fibers and correspond to cardboard, but the flame retardancy and heat resistance were not practical. In Comparative Example 3, the flame retardant was not added at all compared to Example 1, so that the heat resistance was good, but the residual dust was poor among the flame retardant properties. In Comparative Example 4, since the content of the internally added flame retardant was too small compared to Example 1, the residual dust was poor among the flame retardant properties. In Comparative Example 5, the total content of the hydrous inorganic compound and the carbonate was too small as compared with Example 1, and the cellulose fiber was too much, so the flame retardancy and heat resistance were not practical. In Comparative Example 6, no flame retardant was added at all, and the total content of the water-containing inorganic compound and carbonate was excessive as compared with Example 1, and the cellulose fiber was excessive, so the flame retardancy and heat resistance were good. However, the tensile strength was small and the punching workability was poor. Comparative Examples 7 and 8 are cases where a flame retardant was externally added, and in any case, flame retardancy and heat resistance were not practically used regardless of other blending. Comparative Examples 7 and 8 will be described in more detail based on observation items. The guanidine sulfamate flame retardant used here has a low decomposition temperature of about 230 ° C. and is inferior in heat resistance. Further, since the flame retardant was externally added by impregnation, it was not possible to contain a sufficient flame retardant in the core portion of the sheet. As a result, residual dust was generated in the core portion for a long time. In addition, the flame retardant having a low decomposition temperature and poor heat resistance is unevenly distributed in the surface layer portion of the sheet, and as a result of locally increasing the content of the flame retardant in the surface layer portion, the heat resistance against radiant heat from illumination is reduced ( In Comparative Example 7 in which the amount of flame retardant impregnation was slightly large, the heat resistance was particularly significantly reduced).

It is explanatory drawing which shows the flame retardant 2 or the measurement condition of heat resistance. It is explanatory drawing which shows the flame contact condition in the measurement of the flame retardance 2. It is a top view which shows the punching shape of a punching molding machine.

Explanation of symbols

1 Sheet 2 Spotlight 3 Light 4 Lighter 5 Stamped molded body

Claims (10)

It is a sheet obtained by wet papermaking a raw material slurry containing a flame retardant, water-containing inorganic compound and / or carbonate, and cellulose fiber, which are hardly soluble in water,
The flame retardant, the water-containing inorganic compound and / or the carbonate, and the cellulose fiber is distributed throughout the thickness direction in the sheet,
The content of the water-containing inorganic compound and / or the carbonate in the sheet is 35 to 75% by mass in solid content,
The content of the cellulose fiber in the sheet is 20 to 60% by mass in solid content,
The flame retardant content in the sheet is 2 to 15% by mass in solid content, and
L ^* a ^* b ^* Lightness index L ^* of the sheet surface by the color system of JIS Z 8730: 1995 “Color display method—color difference of object color” is 65 or less.   The thickness of the said sheet | seat is 0.3-3 mm, The sheet | seat for lighting adjustment tools of Claim 1 characterized by the above-mentioned.   The decomposition | disassembly temperature of the said flame retardant is 300 degreeC or more, The sheet | seat for lighting adjustment tools of Claim 1 or 2 characterized by the above-mentioned.   The said flame retardant is at least 1 sort (s) selected from the melamine phosphate flame retardant and the melamine sulfate flame retardant, The sheet | seat for lighting adjustment tools of Claim 1, 2, or 3 characterized by the above-mentioned.   The solid content mass ratio of the said water-containing inorganic compound and the said carbonate is 100 / 0-50 / 50, The sheet | seat for lighting adjustment tools of Claim 1, 2, 3 or 4 characterized by the above-mentioned.   The water-containing inorganic compound is at least one selected from aluminum hydroxide, magnesium hydroxide, calcium hydroxide, dihydrate gypsum and calcium aluminate. The sheet | seat for lighting adjustment tools of 4 or 5.   The sheet for an illumination adjustment tool according to claim 1, 2, 3, 4, 5, or 6, wherein the carbonate is calcium carbonate. In accordance with the 45 ° Meckel burner method stipulated in Article 4-3, Paragraph 4 of the Fire Service Law Enforcement Regulations, the carbonization area is 40 cm ² or less, the afterflame time is 5 seconds or less, and the residual dust time is 20 seconds in a 2-minute heating test. It has the flame retardance which satisfies the following, The sheet | seat for lighting adjustment tools of Claim 1, 2, 3, 4, 5, 6 or 7 characterized by the above-mentioned.   Satisfies that little or no smoke is generated from a sheet when a 500 W spotlight for photography is irradiated for 60 seconds from a distance of 5 cm, and the deterioration of the sheet after irradiation is hardly observed. It has heat resistance, The sheet | seat for lighting adjustment tools of Claim 1, 2, 3, 4, 5, 6, 7 or 8 characterized by the above-mentioned. An illumination adjuster comprising a stamped molded body of the sheet for an illumination adjuster according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9.

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