JP5223359B2 - Incombustible inkjet sheet - Google Patents

Description

  The present invention relates to a nonflammable inkjet sheet having nonflammability that can be used as wallpaper, posters, and the like, and particularly to a nonflammable inkjet sheet that can pass a nonflammability test and has excellent print quality. .

  In recent years, strict standards for flameproofing, fireproofing and nonflammability have been set for building interior materials based on social demands related to prevention of fire accidents in buildings, and nonflammable building materials such as wall coverings and wall materials. As the demand for materials increases, so-called non-flammable inkjets that are not flammable and heat resistant are also used for ink-jet paper used for wallpaper and posters that are affixed to the surface of these building materials or suspended from the ceiling. The demand for seats is extremely high.

 Therefore, as an inkjet paper that does not easily burn, in Japanese Patent Application Laid-Open No. H10-260260, an inkjet paper having an ink receptive coating layer containing fine particle synthetic silica and a resin adhesive as main components on one surface of a base paper containing a flame retardant such as ammonium phosphate. An invention of recording paper is disclosed. As a result, it is said that a high-quality image can be printed at high speed using an ink jet printer and plotter using water-based ink, and a flame-retardant ink jet recording paper that can be used as it is as wallpaper or a poster is obtained.

However, in the technique described in Patent Document 1, the nonflammable ink jet sheet that only provides flame retardancy that the carbonization length by the method defined in JIS-A-1322 is short and passes the nonflammability test. Is not obtained. Then, the nonflammable print media of a nonpatent literature 1 are developed as an inkjet sheet which has a nonflammability which passes a nonflammability test.
Japanese Patent Laid-Open No. 2004-122895 Imaging Photocraft Co., Ltd. website (http://www.photocraft.co.jp/)

  However, the non-combustible print media described in Non-Patent Document 1 uses a coated glass cloth (GF), and thus has been certified as a non-combustible material. As a result, the smoothness of the surface cannot be maintained, and a good print quality such as that of a normal inkjet paper cannot be obtained.

  Accordingly, the present invention provides a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder. By using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It is an object of the present invention to provide a non-combustible inkjet sheet.

 The nonflammable inkjet sheet according to the invention of claim 1 is a hydrous magnesium silicate compound 74% to 85% by weight, pulp 5% to 11% by weight, alumina borosilicate glass 4% to 12% by weight, and binder 3%. A first layer composed of a magnesium silicate sheet containing from 7% to 7% by weight, and a second layer composed of inkjet paper or a polyvinyl chloride film.

  Here, “hydrous magnesium silicate compounds” include natural minerals sepiolite (hydrous magnesium silicate), attapulgite (hydrous magnesium aluminum silicate), talc (talc, hydrous magnesium silicate), etc., and these It also includes synthetics of hydrous magnesium silicate compounds.

In the nonflammable inkjet sheet according to the invention of claim 2 , in the configuration of claim 1 , the inkjet paper or the polyvinyl chloride film has a thickness in the range of 40 μm to 80 μm .

The nonflammable inkjet sheet according to the invention of claim 3 is a hydrous magnesium silicate compound 74 wt% to 85 wt%, pulp 5 wt% to 11 wt%, alumina borosilicate glass 4 wt% to 12 wt%, and binder 3 wt%. A first layer made of a magnesium silicate sheet containing 7% by weight to 7% by weight and a second layer made of ink jet paper or laser printer paper are provided.

A nonflammable inkjet sheet according to a fourth aspect of the present invention is the non-flammable inkjet sheet according to the third aspect , wherein the thickness of the inkjet paper or the laser printer paper is in the range of 50 μm to 150 μm.

A nonflammable inkjet sheet according to a fifth aspect of the present invention is the non-combustible ink jet sheet according to any one of the first to fourth aspects, wherein the magnesium silicate sheet has a thickness of 0.2 mm to 0.5 mm (200 μm to 500 μm). It is within the range.

The nonflammable inkjet sheet according to the invention of claim 6 has an average particle diameter of the hydrous magnesium silicate compound, which is a material of the magnesium silicate sheet, in the configuration of any one of claims 1 to 5. It is within the range of 25 μm.

A nonflammable inkjet sheet according to a seventh aspect of the present invention is the nonflammable ink jet sheet according to any one of the first to sixth aspects, wherein the hydrous magnesium silicate compound as a material of the magnesium silicate sheet is sepiolite (hydrous magnesium silicate). ).

The nonflammable inkjet sheet according to the invention of claim 8 is a hydrous magnesium silicate compound 74 wt% to 85 wt%, pulp 5 wt% to 11 wt%, alumina borosilicate glass 4 wt% to 12 wt%, and binder 3 wt%. The surface of the magnesium silicate sheet containing from 7% to 7% by weight is coated with a fine particle synthetic silica as an ink receptive coating layer and an organic synthetic resin adhesive as main components.

 The nonflammable inkjet sheet according to the invention of claim 1 is a hydrous magnesium silicate compound 74% to 85% by weight, pulp 5% to 11% by weight, alumina borosilicate glass 4% to 12% by weight, and binder 3%. A first layer composed of a magnesium silicate sheet containing from 7% to 7% by weight and a second layer composed of inkjet paper or a polyvinyl chloride film.

  Here, “hydrous magnesium silicate compounds” include natural minerals sepiolite (hydrous magnesium silicate), attapulgite (hydrous magnesium aluminum silicate), talc (talc, hydrous magnesium silicate), etc., and these It also includes synthetics of hydrous magnesium silicate compounds.

  As a result of diligent experimental research, the present inventors have found that the magnesium silicate sheet as a non-combustible sheet is 74 wt% to 85 wt% hydrous magnesium silicate compound, 5 wt% to 11 wt% pulp, and the alumina borosilicate glass 4. It has been found that those containing 12% by weight to 12% by weight and 3% by weight to 7% by weight of the binder are more excellent in nonflammability and flameproofing and satisfy the conditions of nonflammable materials.

That is, the magnesium silicate sheet having the above composition has a total calorific value of only 0.8 MJ / m ² (passing the total calorific value) even when heated to 600 ° C. by heating for 20 minutes in the exothermic test of incombustible materials. The value was 8.0 MJ / m ² or less), and the thickness was only 0.25 mm, the shape was maintained without cracks, and it passed as a nonflammable material.

  However, if only such a magnesium silicate sheet is used as the material of the non-combustible inkjet sheet, the print quality cannot be ensured. Accordingly, the present inventors have provided a layer of inkjet paper or a polyvinyl chloride film on the surface of the magnesium silicate sheet, thereby ensuring printing characteristics and low thermal conductivity (thermal conductivity: 0.11 W / mK) A non-flammable inkjet sheet that can pass the exothermic test of non-flammable materials by blocking heat conduction with magnesium silicate sheet and suppressing the generation of flammable gas from inkjet paper or polyvinyl chloride film I came up with it.

The incombustible inkjet sheet according to the present invention thus obtained has a total calorific value of 8.0 MJ / m ² or less in the exothermic test of the incombustible material, and the maximum exothermic rate continuously exceeds 200 kW / m ^2. Was less than 10 seconds and passed the exothermic test of the non-combustible material. Further, since it is formed by laminating a magnesium silicate sheet and inkjet paper or a polyvinyl chloride film having no unevenness and extremely excellent smoothness, the printing quality and the smoothness were extremely excellent.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

In the nonflammable inkjet sheet according to the invention of claim 2 , the thickness of the inkjet paper or the polyvinyl chloride film is in the range of 40 μm to 80 μm .

  As a result of intensive experiments and studies on the appropriate thicknesses of the second layer and the third layer in the nonflammable inkjet sheet according to the present invention, the inventors have found that the thickness of the inkjet paper or the polyvinyl chloride film is 40 μm to In the range of 80 μm, when the thickness of the laminate film is in the range of 50 μm to 90 μm, it has been found that both non-flammability and print quality can be achieved more reliably, and the present invention has been completed based on this finding. is there.

  In other words, if the thickness of the inkjet paper / polyvinyl chloride film is less than 40 μm, the thickness of the ink-receptive coating layer may become thin and good print quality may not be ensured. If the thickness of the film exceeds 80 μm, there may be cases where nonflammability cannot be ensured. In addition, when the thickness of the laminate film is less than 50 μm, water resistance may be insufficient when used outdoors or in areas where water is applied. On the other hand, when the thickness of the laminate film exceeds 90 μm, nonflammable There is a case where it is not possible to secure the sex. Therefore, the thickness of the inkjet paper / polyvinyl chloride film is preferably in the range of 40 μm to 80 μm, and the thickness of the laminate film is preferably in the range of 50 μm to 90 μm.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

The nonflammable inkjet sheet according to the invention of claim 3 is a hydrous magnesium silicate compound 74 wt% to 85 wt%, pulp 5 wt% to 11 wt%, alumina borosilicate glass 4 wt% to 12 wt%, and binder 3 wt%. A first layer composed of a magnesium silicate sheet containing from 7% to 7% by weight and a second layer composed of ink jet paper or laser printer paper.

 As described above, the magnesium silicate sheet having the above composition has passed the non-combustible material in the exothermic test of the non-combustible material, but only the magnesium silicate sheet is used as the material of the non-combustible inkjet sheet. The print quality cannot be ensured. Therefore, the present inventors have provided a layer made of inkjet paper or laser printer paper on the surface of the magnesium silicate sheet, thereby ensuring printing characteristics and low thermal conductivity (thermal conductivity: 0.11 W / mK) Produces a nonflammable inkjet sheet that can pass the exothermic test of nonflammable materials by blocking heat conduction with magnesium silicate sheet and suppressing the generation of flammable gas from inkjet paper or laser printer paper I came up with it.

The incombustible inkjet sheet according to the present invention thus obtained has a total calorific value of 8.0 MJ / m ² or less in the exothermic test of the incombustible material, and the maximum exothermic rate continuously exceeds 200 kW / m ^2. Was less than 10 seconds and passed the exothermic test of the non-combustible material. Further, since it is formed by laminating a magnesium silicate sheet and ink jet paper or laser printer paper having no unevenness and extremely excellent smoothness, the print quality and the smoothness were extremely excellent.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

In the nonflammable inkjet sheet according to the invention of claim 4 , the thickness of the inkjet paper or the laser printer paper is in the range of 50 μm to 150 μm.

  As a result of intensive experiments and studies on the appropriate thickness of the second layer in the non-combustible inkjet sheet according to the present invention, the inventors have determined that the thickness of inkjet paper or laser printer paper is within the range of 50 μm to 150 μm. In some cases, it has been found that both nonflammability and print quality can be achieved more reliably, and the present invention has been completed based on this finding.

  That is, if the thickness of the ink jet paper / laser printer paper is less than 50 μm, the thickness of the ink-receptive coating layer may be reduced, and good print quality may not be ensured. When the thickness exceeds 150 μm, there are cases where nonflammability cannot be ensured. Therefore, the thickness of the ink jet paper / laser printer paper is preferably in the range of 50 μm to 150 μm.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

In the nonflammable inkjet sheet according to the invention of claim 5 , the thickness of the magnesium silicate sheet is in the range of 0.2 mm to 0.5 mm (200 μm to 500 μm), more preferably 0.25 mm ± 0.05 mm. . As a result of earnest experimental research, the present inventors have found that a non-flammable inkjet that can pass the exothermic test of a non-flammable material more reliably when the thickness of the magnesium silicate sheet is in the range of 0.2 mm to 0.5 mm. It has been found that a sheet can be obtained, and the present invention has been completed based on this finding.

  That is, if the thickness of the magnesium silicate sheet is less than 0.2 mm, the magnesium silicate sheet may be too thin to obtain a sufficient thermal barrier effect due to low thermal conductivity. Since it becomes easy to break, it becomes difficult to perform the construction for lamination. On the other hand, when the thickness of the magnesium silicate sheet exceeds 0.5 mm, the magnesium silicate sheet is too thick and the print quality of the non-combustible inkjet sheet is deteriorated. End up. Therefore, the thickness of the magnesium silicate sheet is preferably in the range of 0.2 mm to 0.5 mm.

  Furthermore, when the thickness of the magnesium silicate sheet is 0.25 mm ± 0.05 mm, it is more preferable because high nonflammability and good print quality can be obtained in the nonflammable inkjet sheet.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

In the nonflammable inkjet sheet according to the invention of claim 6 , the average particle size of the hydrous magnesium silicate compound which is the material of the magnesium silicate sheet is in the range of 10 μm to 25 μm, more preferably the average particle size is 12 μm to 18 μm. Within range.

 Here, the “average particle diameter” is a value measured by ethanol dispersion using a laser particle size measuring instrument LS13-320 manufactured by Beckman Coulter. As a result of earnest experimental research, the present inventors have found that when the average particle size of the hydrous magnesium silicate compound is in the range of 10 μm to 25 μm, the magnesium silicate sheet constituting the nonflammable inkjet sheet is more nonflammable and The present inventors have found that it is excellent in flame retardancy and completed the present invention based on this finding.

  Furthermore, as a result of earnest experimental research, the present inventors have found that the magnesium silicate sheet constituting the nonflammable inkjet sheet is more nonflammable when the average particle size of the hydrous magnesium silicate compound is in the range of 12 μm to 18 μm. In addition, the present invention has been found to be more preferable because it is excellent in flameproofing properties and has an appropriate value for the viscosity of the slurry containing the hydrous magnesium silicate compound so that papermaking can be performed more smoothly. Therefore, the average particle diameter of the hydrous magnesium silicate compound is preferably in the range of 10 μm to 25 μm, and more preferably in the range of 12 μm to 18 μm.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

In the nonflammable inkjet sheet according to the invention of claim 7 , the hydrous magnesium silicate compound which is a material of the magnesium silicate sheet is sepiolite (hydrous magnesium silicate).

 Sepiolite is an inorganic compound among hydrous magnesium silicate compounds that has adsorptive properties, thixotropic properties, and caking properties, and can produce a magnesium silicate sheet having both incombustibility and water resistance. Therefore, by using sepiolite as the hydrous magnesium silicate compound that is a material of the magnesium silicate sheet, more excellent nonflammability and water resistance can be obtained.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

The nonflammable inkjet sheet according to the invention of claim 8 is a hydrous magnesium silicate compound 74 wt% to 85 wt%, pulp 5 wt% to 11 wt%, alumina borosilicate glass 4 wt% to 12 wt%, and binder 3 wt%. The surface of the magnesium silicate sheet containing from 7% to 7% by weight is coated with fine particle synthetic silica as an ink-receptive coating layer and an organic synthetic resin adhesive as main components.

 As described above, the magnesium silicate sheet having the above composition has passed the non-combustible material in the exothermic test of the non-combustible material, but only the magnesium silicate sheet is used as the material of the non-combustible inkjet sheet. The print quality cannot be ensured. Therefore, the present inventors ensured printing characteristics and nonflammability by applying a coating mainly composed of fine particle synthetic silica and an organic synthetic resin adhesive as an ink receptive coating layer on the surface of the magnesium silicate sheet. The inventors have come up with the idea of producing a non-flammable inkjet sheet that can pass the exothermic test of the material.

The incombustible inkjet sheet according to the present invention thus obtained has a total calorific value of 8.0 MJ / m ² or less in the exothermic test of the incombustible material, and the maximum exothermic rate continuously exceeds 200 kW / m ^2. Was less than 10 seconds and passed the exothermic test of the non-combustible material. In addition, since the surface of the magnesium silicate sheet having no unevenness and excellent in smoothness is subjected to a coating mainly composed of fine particle synthetic silica and an organic synthetic resin adhesive as an ink receptive coating layer, The printing quality and smoothness were extremely excellent.

 In this way, a magnesium silicate sheet having excellent nonflammability and flameproofness that passes the exothermic test of nonflammable materials by optimizing the blending ratio of hydrous magnesium silicate compound, pulp, alumina borosilicate glass and binder By developing and using this magnesium silicate sheet as a base material, it has extremely excellent nonflammability that can pass the exothermic test of nonflammable materials, and also has excellent smoothness, and print quality is impaired. It becomes a nonflammable inkjet sheet.

  Embodiments of the present invention will be described below with reference to the drawings. In each embodiment, the same symbol and the same reference sign mean the same or corresponding functional part, and the same sign and the same reference sign in the embodiments are the functional parts common to those embodiments. Therefore, the detailed description which overlaps is abbreviate | omitted here.

Embodiment 1
First, the nonflammable inkjet sheet according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4.

 FIG. 1A is a perspective view showing the overall structure of a nonflammable inkjet sheet according to Embodiment 1 of the present invention, and FIG. 1B is a cross section showing the laminated structure of the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. FIG. 2 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. 3 is a flowchart showing a method for manufacturing a magnesium silicate sheet constituting the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. 4 is a graph showing the particle size distribution of sepiolite as a hydrous magnesium silicate compound used in the magnesium silicate sheet constituting the nonflammable inkjet sheet according to Embodiment 1 of the present invention.

  First, the whole structure and laminated structure of the nonflammable inkjet sheet 1 according to the first embodiment will be described with reference to FIG.

 As shown in FIGS. 1 (a) and 1 (b), the nonflammable inkjet sheet 1 according to the first embodiment is composed of 75% by weight to 85% by weight of a hydrous magnesium silicate compound in the first layer and 7% by weight of pulp. A magnesium silicate sheet 2 containing 12% by weight, 2% to 10% by weight of glass fiber, and 3% to 8% by weight of a binder, and a polyvinyl chloride film 3 as an ink-receptive coating layer of the second layer The third laminated film 4 is sequentially laminated. Here, the third layer made of the laminate film 4 is formed after printing by an inkjet printer or the like.

In the nonflammable inkjet sheet 1 according to the first embodiment, the magnesium silicate sheet 2 has a thickness of 0.25 mm (250 μm), the polyvinyl chloride film 3 has a thickness of 80 μm, and the laminate film 4 has a thickness. Is 90 μm. About the nonflammable inkjet sheet 1 which concerns on this Embodiment 1, the exothermic test of the nonflammable material was implemented and evaluated. Specifically, heating was performed at a radiation intensity of 50 kW / m ² from the opposite surface of the acrylic solvent-type pressure-sensitive adhesive 4 as the tape pressure-sensitive adhesive, and the total heat generation amount and the heat generation rate were measured. The measurement results are shown in FIG.

As shown in FIG. 2, in the nonflammable inkjet sheet 1 according to the first embodiment, the total calorific value was less than 4 MJ / m ² during the heating time of 20 minutes, and the heat generation rate was extremely low. . Moreover, the time when the maximum heat generation rate continued and exceeded 200 kW / m ² was also 6 seconds, which satisfied the condition of an acceptable value of less than 10 seconds. Further, as shown in Table 1, there was no deformation that was harmful to fire prevention, and the ignition time was very short.

 As a result, it became clear that the nonflammable inkjet sheet 1 according to the first embodiment passed the exothermic test of the nonflammable material and was certified as a nonflammable material. Further, since the magnesium silicate sheet 2 and the polyvinyl chloride film 3 having no unevenness and extremely smoothness are laminated, and the laminate film 4 is further laminated, both in smoothness and printing quality. It was very good.

  As described above, in the nonflammable inkjet sheet 1 according to the first embodiment, the layer of the aluminum foil 2 is provided on the surface of the magnesium silicate sheet 2 to block the flammable gas and has excellent thermal conductivity. The aluminum foil 2 disperses heat to make it more resistant to local heating, and the magnesium silicate sheet 2 with low thermal conductivity blocks heat conduction to the polyvinyl chloride film 3 to generate flammable gas. Can be suppressed.

 Next, the manufacturing method of the magnesium silicate sheet which comprises the nonflammable inkjet sheet which concerns on this Embodiment 1 is demonstrated with reference to FIG. As shown in FIG. 3, in the defibrating step of step S10, a hydrous magnesium silicate compound such as sepiolite as a main raw material and alumina borosilicate glass / pulp as a reinforcing material are put into a defibrator and stirred. In this way, sepiolite or the like composed of a lump of fine fibers is sufficiently defibrated to improve its dispersibility, and homogeneously mixed with alumina borosilicate glass / pulp.

  Subsequently, in the raw material mixing step of Step S11, a hydrous magnesium silicate compound such as sepiolite mixed with the borosilicate glass / pulp after being defibrated is put into a mixing tank together with a binder / softener / stabilizer as a binder. Mix with water to make a slurry. Here, as the binder, polyacrylamide having a molecular weight of 800,000 to 1,000,000 for enhancing paper strength was used. The produced slurry is focused by the paper stock focusing reactor in the stock processing step (step S12). By this paper processing step, coarse flocs are formed, and a slurry with improved papermaking properties is formed.

  The slurry prepared as a stock in the stock processing step (step S12) is sent to a stock tank so that the mixed state is always uniform so that sedimentation separation and collapse of the prepared stock do not occur. The storage process to be maintained is entered (step S13). The slurry accumulated in the stock tank in the accumulation process is pumped up to the metering hopper, and the slurry weighed by the metering hopper then enters the paper making process (step S14).

 In this paper making step (step S14), a slurry containing a hydrous magnesium silicate compound such as sepiolite as a main material and forming good coarse flocs is made by a continuous paper machine or the like. In Embodiment 1, paper was made using a round net type paper machine. At this time, the slurry concentration was 0.5% to 1.0%, and a paper mesh of 60 to 80 mesh was used for the paper machine. When the slurry on which the aggregated flocs are formed is poured into the papermaking net, water quickly flows down from the papermaking net through the aggregated flocs to form a paper layer.

  Thereafter, the paper layer is dehydrated by pressing in the drying step (step S15), and the dehydrated wet paper is dried at a temperature of about 120 ° C. for a predetermined time by, for example, a steam rotary dryer. By this heat drying, moisture inside the paper layer evaporates, and the condensation and curing of the binder is promoted to be dried and solidified. The dried magnesium silicate sheet is peeled off from the dryer surface of the steam rotary dryer and formed on a web. The magnesium silicate sheet 2 having a thickness of 0.2 mm to 0.3 mm is completed by the above steps S10 to S15.

  Next, the raw material composition of the magnesium silicate sheet 2 constituting the nonflammable inkjet sheet according to Embodiment 1 will be described. The magnesium silicate sheet 2 according to Embodiment 1 uses only sepiolite (hydrous magnesium silicate, also called “mountain leather (mountain skin)”, “mountain wood”) as the hydrous magnesium silicate compound. is there. Table 2 shows the raw material composition of the magnesium silicate sheet 2 according to the example.

  As shown in Table 2, the magnesium silicate sheet 2 according to the example contains 80.0% by weight of sepiolite as a hydrous magnesium silicate compound as a main component. Here, sepiolite of Mizusawa Chemical Industry Co., Ltd. was used as sepiolite. Further, it contains 5.0% by weight of alumina borosilicate glass fiber (length: 1 mm to 3 mm), 10.0% by weight of pulp, and 5.0% by weight of binders.

 As binders, Oji Paper uses a combination of wet paper strength enhancer and dry paper strength enhancer made by Showa Polymer Chemical Co., Ltd., which has good compatibility with sepiolite as a paper strength enhancer, and an inorganic binder. Aluminum sulfate manufactured by Co., Ltd. is used. Furthermore, a polymer flocculant is used.

 Thus, sepiolite as a hydrous magnesium silicate compound is 75 wt% to 85 wt%, pulp is 7 wt% to 12 wt%, alumina borosilicate glass fiber having a length of 1 mm to 3 mm is 2 wt% to 5 wt%, and By making the magnesium silicate sheet containing 3 wt% to 8 wt% of the binder, the heat resistance and nonflammability are further improved, and the magnesium silicate sheet 2 according to the embodiment is also nonflammable and flameproof, Even if it is held over the flame of a burner, it generates a slight amount of smoke and is blackened, maintaining its shape without the penetration of the flame.

  Further, the magnesium silicate sheet 2 according to the example has a calorific value of only 0.8 MJ and only 0.25 mm even when it becomes close to 600 ° C. by heating for 20 minutes in the exothermic test of the incombustible material. It retains its shape without any cracks in thickness, has passed as a nonflammable material, and has extremely excellent nonflammability. Furthermore, in the magnesium silicate sheet 2 according to the example, unlike the magnesium silicate sheet according to the modified example described later, the internal structure becomes dense by using glass fibers having a length of 1 mm to 3 mm, As a result, the effect that the surface becomes extremely smooth can be obtained.

  Next, the raw material composition of the magnesium silicate sheet according to the modification will be described. Also in the magnesium silicate sheet according to the modified example, sepiolite (hydrous magnesium silicate) is used as the hydrous magnesium silicate compound. However, the difference is that the length of the alumina borosilicate glass fiber is as long as 6 mm on average. Table 3 shows the raw material composition of the magnesium silicate sheet according to the modification.

  As shown in Table 3, the magnesium silicate sheet according to the modification contains 77.0% by weight of sepiolite as a main component, 10.0% by weight of alumina borosilicate glass fiber (average length 6 mm), pulp In an amount of 8.0% by weight and binders in an amount of 5.0% by weight. Here, as sepiolite (hydrous magnesium silicate), sepiolite of Mizusawa Chemical Industry Co., Ltd. was used.

 Also, as binders, we use a combination of wet paper strength enhancer and dry paper strength enhancer manufactured by Showa Polymer Chemical Co., Ltd., which have good compatibility with sepiolite, as an inorganic binder. Aluminum sulfate manufactured by Oji Paper Co., Ltd. is used. Furthermore, a polymer flocculant is used.

 Thus, sepiolite as a hydrous magnesium silicate compound is 75% to 85% by weight, pulp is 7% to 12% by weight, alumina borosilicate glass fiber is 2% to 10% by weight, and binder is 3% to 8% by weight. %, The heat resistance and non-flammability are further improved, and the magnesium silicate sheet according to the modification is also non-flammable and flameproof, and is slightly exposed to the flame of the gas burner. It generates black smoke and generates black smoke, maintaining its shape without penetrating the flame, and is certified as flame proof grade 1.

  Further, the magnesium silicate sheet according to the modified example also has a heat generation amount of only 0.8 MJ and a thickness of only 0.25 mm even when the heat generation test of the non-combustible material reaches 600 ° C. by heating for 20 minutes. It retains its shape without cracks, has passed as a non-combustible material, and has extremely excellent non-combustibility.

  As described above, in the formulation according to the example used for the nonflammable inkjet sheet of the first embodiment, a magnesium silicate sheet 2 having a thickness of about 0.25 mm and having an extremely smooth at least one surface is obtained. In the formulation according to the modified example, although both surfaces are pressed and dried under the same conditions, fine unevenness is formed on the surfaces of both surfaces, and the surfaces are not completely smooth.

 In the magnesium silicate sheet according to the modification, alumina borosilicate glass fibers having an average length of 6 mm are used, so that the long glass fibers are bulky and the sepiolite and pulp packing density is sparse. Fine irregularities are formed on the entire surface of the magnesium sheet, and it is not completely smooth.

  On the other hand, in the magnesium silicate sheet 2 which concerns on the Example of this Embodiment 1, since the borosilicate glass fiber of maximum length 3mm (within the range of 1 mm-3 mm) is used, glass fiber is also used. Sepiolite and pulp are also densely packed, and as a result, the surface of the magnesium silicate sheet 2 becomes extremely smooth, and the effect that the printing of characters and patterns can be easily and beautifully obtained.

  However, the magnesium silicate sheet according to the modified example is inferior to the magnesium silicate sheet 2 according to the example in the complete smoothness of the surface, but is excellent in smoothness as compared with the conventional non-combustible inkjet sheet. Moreover, since the non-flammable inkjet sheet 1 according to the first embodiment has an extremely excellent non-flammability equivalent to that of the magnesium silicate sheet 2 according to the example, the magnesium silicate sheet 2 according to the example is used instead of the magnesium silicate sheet 2 according to the example. Even if the magnesium silicate sheet which concerns on a modification is used, the nonflammable inkjet sheet which has equivalent nonflammability can be obtained.

  Next, the particle size distribution of sepiolite used in the magnesium silicate sheet according to the example and the modification of the first embodiment will be described with reference to FIG. FIG. 4 shows the result of measuring the particle size distribution of sepiolite used in the magnesium silicate sheet according to Examples and Modifications by ethanol dispersion using a laser particle size measuring instrument LS13-320 manufactured by Beckman Coulter.

 As shown in FIG. 4, the sepiolite used for the magnesium silicate sheet according to the example and the modification has a particle size distribution that draws a beautiful normal distribution curve, and the average particle diameter of the sepiolite according to the example Is 12.0 μm, and the average particle diameter of sepiolite according to the modification is 17.2 μm. The viscosity of the slurry containing these sepiolites becomes an appropriate value, and the papermaking process shown in step S14 of FIG. 3 can be performed more smoothly. Therefore, the average particle diameter of sepiolite is more preferably in the range of 12 μm to 18 μm.

  Moreover, when the average particle diameter of sepiolite was in the range of 10 μm to 25 μm, it was found that the magnesium silicate sheet was more excellent in nonflammability and flameproofing. Therefore, the average particle diameter of sepiolite is preferably in the range of 10 μm to 25 μm.

  Thus, in the nonflammable inkjet sheet 1 according to the first embodiment, it is superior to passing the exothermic test of the nonflammable material by optimizing the blending ratio of the hydrous magnesium silicate compound, pulp, glass fiber and binder. The non-flammable and flameproof magnesium silicate sheet 2, the polyvinyl chloride film 3 as the ink-receptive coating layer, and the laminate film 4 are laminated to make it excellent in passing the exothermic test of nonflammable materials. In addition to being non-flammable, it has excellent smoothness and print quality.

  Furthermore, in the nonflammable inkjet sheet 1 according to the first embodiment, since the laminate film 4 is laminated on the polyvinyl chloride film 3 as the ink receptive coating layer, it is used outdoors as wallpaper, posters, etc. It can withstand use in water and places where water is applied, and becomes a more versatile nonflammable inkjet sheet.

Embodiment 2
Next, a nonflammable inkjet sheet according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 5A is a perspective view showing the entire structure of the non-flammable inkjet sheet according to Embodiment 2 of the present invention, and FIG. 5B is a cross section showing the laminated structure of the non-flammable inkjet sheet according to Embodiment 2 of the present invention. FIG. FIG. 6 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 2 of the present invention.

  As shown in FIGS. 5 (a) and 5 (b), the nonflammable inkjet sheet 6 according to the second embodiment is 75% by weight to 85% by weight of the hydrous magnesium silicate compound in the first layer and 7% by weight of pulp. It is configured by laminating a magnesium silicate sheet 2 containing -12 wt%, glass fibers 2 wt% to 10 wt% and a binder 3 wt% to 8 wt%, and a second layer of inkjet paper 7.

  Here, although not shown in FIG. 5B, in the nonflammable inkjet sheet 7 according to the second embodiment, a polyethylene resin as an adhesive is applied between the first layer and the second layer. ing. That is, the first layer magnesium silicate sheet 2 and the second layer inkjet paper 7 are bonded and laminated by a polyethylene resin. Moreover, the thickness of the inkjet paper 7 is 100 μm, and the thickness of the magnesium silicate sheet 2 is 0.25 mm (250 μm).

  Note that the adhesive is not limited to polyethylene resin, and thermoplastic resins such as polypropylene, vinyl chloride, and acrylic resin, as well as thermosetting resins such as epoxy resin, phenol resin, and urethane resin can be used. Thermoplastic elastomers such as acrylic rubber can also be used.

About the nonflammable inkjet sheet | seat 6 which concerns on this this Embodiment 2, the exothermic test of the nonflammable material was implemented and evaluated. Specifically, heating was performed at a radiation intensity of 50 kW / m ² from the magnesium silicate sheet 2 side, and the total heat generation amount and the heat generation rate were measured. The measurement results are shown in FIG.

As shown in FIG. 6, in the nonflammable inkjet sheet 6 according to the second embodiment, the total calorific value was less than 4 MJ / m ² during the heating time of 20 minutes, and the heat generation rate was extremely low. . Moreover, the time when the maximum heat generation rate continued and exceeded 200 kW / m ² was also 0 seconds, which satisfied the condition that the acceptable value was less than 10 seconds. Further, as shown in Table 4, there was no deformation that was harmful to fire prevention, and the ignition time was very short.

 As a result, it was revealed that the nonflammable inkjet sheet 6 according to Embodiment 2 passed the exothermic test of the nonflammable material and was certified as a nonflammable material. Further, since the magnesium silicate sheet 2 and the inkjet paper 7 having no unevenness and excellent in smoothness are laminated, the smoothness and the printing quality are extremely excellent.

  Thus, in the nonflammable inkjet sheet 6 according to the second embodiment, it is superior to passing the exothermic test of the nonflammable material by optimizing the blending ratio of the hydrous magnesium silicate compound, pulp, glass fiber and binder. By laminating the non-flammable and flameproof magnesium silicate sheet 2 and the inkjet paper 7, it has excellent nonflammability to pass the exothermic test of nonflammable materials, and extremely smooth and print quality. It will be excellent.

Embodiment 3
Next, a nonflammable inkjet sheet according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 7A is a perspective view showing the entire structure of the nonflammable inkjet sheet according to Embodiment 3 of the present invention, and FIG. 7B is a cross section showing the laminated structure of the nonflammable inkjet sheet according to Embodiment 3 of the present invention. FIG. FIG. 8 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 3 of the present invention.

 As shown in FIGS. 7A and 7B, the non-combustible inkjet sheet 11 according to the third embodiment is composed of 75% to 85% by weight of a hydrous magnesium silicate compound and 7% to 12% by weight of pulp. Mainly fine particle synthetic silica and organic synthetic resin adhesive as ink-receptive coating layer on the surface of magnesium silicate sheet 2 containing 2% to 10% by weight of glass fiber and 3% to 8% by weight of binder. A coating 12 as a component is formed and configured.

Here, as the coating 12 mainly composed of fine particle synthetic silica and organic synthetic resin adhesive as the ink receptive coating layer, more specifically, “Mizukasil” manufactured by Mizusawa Chemical Industry Co., Ltd. as fine particle synthetic silica. Formed by applying and drying 100 parts of silanolated polyvinyl alcohol R-1130 manufactured by Kuraray Co., Ltd. as an organic synthetic resin adhesive with a bar coater at a rate of 8 g / m ² did.

About the nonflammable inkjet sheet 11 which concerns on this this Embodiment 3, the exothermic test of the nonflammable material was implemented and evaluated. Specifically, heating was performed at a radiation intensity of 50 kW / m ² from the magnesium silicate sheet 2 side, and the total heat generation amount and the heat generation rate were measured. The measurement results are shown in FIG.

As shown in FIG. 8, in the nonflammable inkjet sheet 11 according to the third embodiment, the total calorific value was less than ² MJ / m ² during the heating time of 20 minutes, and the heat generation rate was extremely low. . Moreover, the time when the maximum heat generation rate continued and exceeded 200 kW / m ² was also 0 seconds, which satisfied the condition that the acceptable value was less than 10 seconds. Furthermore, as shown in Table 5, there was no deformation harmful to fire prevention, and the ignition time was zero.

 As a result, it was revealed that the nonflammable inkjet sheet 11 according to Embodiment 3 passed the exothermic test of the nonflammable material and was certified as a nonflammable material. Further, since the magnesium silicate sheet 2 having no unevenness and excellent in smoothness is provided with a coating 12 mainly composed of fine particle synthetic silica and an organic synthetic resin adhesive as an ink receptive coating layer. In terms of smoothness and print quality, it was extremely excellent.

  Thus, in the nonflammable inkjet sheet 11 according to the third embodiment, the mixture ratio of the hydrous magnesium silicate compound / pulp / glass fiber and the binder is optimized to pass the exothermic test of the nonflammable material. By applying a coating 12 mainly composed of fine-particle synthetic silica and an organic synthetic resin adhesive as an ink-receptive coating layer to the non-combustible and flameproof magnesium silicate sheet 2, it is possible to conduct a heat generation test of non-combustible materials. It has excellent nonflammability to pass, and is extremely excellent in smoothness and print quality.

  In each of the above embodiments, the case where sepiolite (hydrous magnesium silicate) is used as the hydrous magnesium silicate compound which is the main component of the magnesium silicate sheet has been described. However, in addition to sepiolite, Attapulgite (hydrous magnesium aluminum silicate), talc (talc, hydrous magnesium silicate), and the like can also be used.

  In carrying out the present invention, the configuration, structure, material, component, blending, thickness, quantity, shape, size, manufacturing method, etc. of other parts of the nonflammable inkjet sheet are also limited to the above embodiments. Is not to be done. In addition, since the numerical value quoted in the embodiment of the present invention does not indicate a critical value but indicates a preferable value suitable for implementation, even if the numerical value is slightly changed, the implementation is denied. is not.

FIG. 1A is a perspective view showing the overall structure of a nonflammable inkjet sheet according to Embodiment 1 of the present invention, and FIG. 1B is a cross section showing the laminated structure of the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. FIG. 2 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. 3 is a flowchart showing a method for manufacturing a magnesium silicate sheet constituting the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. 4 is a graph showing the particle size distribution of sepiolite as a hydrous magnesium silicate compound used in the magnesium silicate sheet constituting the nonflammable inkjet sheet according to Embodiment 1 of the present invention. FIG. 5A is a perspective view showing the entire structure of the non-flammable inkjet sheet according to Embodiment 2 of the present invention, and FIG. 5B is a cross section showing the laminated structure of the non-flammable inkjet sheet according to Embodiment 2 of the present invention. FIG. FIG. 6 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 2 of the present invention. FIG. 7A is a perspective view showing the entire structure of the nonflammable inkjet sheet according to Embodiment 3 of the present invention, and FIG. 7B is a cross section showing the laminated structure of the nonflammable inkjet sheet according to Embodiment 3 of the present invention. FIG. FIG. 8 is a graph showing the results of the nonflammability test of the nonflammable inkjet sheet according to Embodiment 3 of the present invention.

1,6,11 Nonflammable inkjet sheet 2 Magnesium silicate sheet 3 Polyvinyl chloride film 4 Laminate film 7 Inkjet paper (laser printer paper)
12 Coating

Claims (8)

From a magnesium silicate sheet containing 74% to 85% hydrous magnesium silicate compound, 5% to 11% by weight pulp, 4% to 12% by weight alumina borosilicate glass and 3% to 7% by weight binder A first layer,
A second layer of inkjet paper or polyvinyl chloride film;
A nonflammable inkjet sheet comprising: The non-flammable inkjet sheet according to claim 1, wherein the inkjet paper or the polyvinyl chloride film has a thickness in the range of 40 µm to 80 µm. From a magnesium silicate sheet containing 74% to 85% hydrous magnesium silicate compound, 5% to 11% by weight pulp, 4% to 12% by weight alumina borosilicate glass and 3% to 7% by weight binder A first layer,
A second layer of inkjet paper or laser printer paper;
A nonflammable inkjet sheet comprising: The non-flammable inkjet sheet according to claim 3 , wherein a thickness of the inkjet paper or the laser printer paper is in a range of 50 µm to 150 µm. The nonflammable inkjet sheet according to any one of claims 1 to 4 , wherein a thickness of the magnesium silicate sheet is in a range of 0.2 mm to 0.5 mm (200 µm to 500 µm). . 6. The nonflammability according to claim 1, wherein an average particle diameter of the hydrous magnesium silicate compound which is a material of the magnesium silicate sheet is in a range of 10 μm to 25 μm. Inkjet sheet. The nonflammable inkjet sheet according to any one of claims 1 to 6 , wherein the hydrous magnesium silicate compound which is a material of the magnesium silicate sheet is sepiolite (hydrous magnesium silicate).  A magnesium silicate sheet comprising 74% to 85% hydrous magnesium silicate compound, 5% to 11% by weight pulp, 4% to 12% by weight alumina borosilicate glass and 3% to 7% by weight binder. A nonflammable inkjet sheet comprising a coating mainly comprising fine particle synthetic silica as an ink receptive coating layer and an organic synthetic resin adhesive.

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