JP6074445B2 - Flameproof corrugated cardboard and manufacturing method thereof - Google Patents

Description

  The present invention relates to a flameproof corrugated cardboard having high flameproof performance and a method for producing the same.

  Conventionally, flameproof corrugated cardboard has been proposed that does not ignite easily even if it comes into contact with flames, and that does not spread easily by self-extinguishing properties (the ability to stop the spread of fire spread). For example, in Japanese Patent Application Laid-Open No. 8-133269, at least one of the core and the liner constituting the corrugated cardboard is a paper board material that is a flame retardant paper impregnated with a flame retardant, corrugated cardboard or A paper board material in which a flame retardant paper impregnated with a flame retardant is laminated on at least one surface of the paper board is disclosed (Patent Document 1).

JP-A-8-133269

  However, although the conventional flameproof cardboard including the invention described in Patent Document 1 has a certain degree of flameproof performance, it does not sufficiently satisfy the flameproof performance standard defined in the Fire Service Law. Further, if corrugated cardboard having sufficient flameproof performance can be provided, use in disaster shelters and the like will increase, and therefore cardboard having more practical and high flameproof performance is required.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a flameproof corrugated cardboard having a sufficiently high flameproof performance in practice and a method for producing the same.

  The flameproof corrugated cardboard according to the present invention comprises a flameproof processed paper in which a paperboard is impregnated with a flameproofing agent for impregnation, and a flameproof adhesive in which an adhesive is mixed with a flameproofing agent for bonding. Affixed on both sides.

  As one embodiment of the present invention, the flameproofing agent for impregnation may be applied to one side or both sides of the cardboard.

  Furthermore, as one aspect of the present invention, the impregnation flame retardant may be mixed with a penetration enhancer that promotes penetration into the paperboard.

  Moreover, as one aspect of the present invention, a flame-retardant printing paper having flame retardancy may be attached to the surface of the flame-proof processed paper with the flame-proof adhesive.

  Furthermore, as one aspect of the present invention, the flame retardant printing paper is determined to be a flame retardant product in a flammability test method defined as at least 45 ° micro burner method or JIS standard A1322, and has a basis weight of 7 to 15. %, A non-coated high-quality paper having a paper density of 1.0 or less or a non-coated fancy paper having a paper density of 1.0 or less may be used.

  In one embodiment of the present invention, the adhesive may be a vinyl acetate resin emulsion adhesive.

  Furthermore, as one aspect of the present invention, the flame retardant for impregnation is a flame retardant having a composition containing a composite compound of phosphorus and nitrogen, and the flame retardant for adhesion is mainly composed of halogen and antimony trioxide. It may be a powdery flameproofing agent.

  Further, the method for producing a flameproof corrugated cardboard according to the present invention comprises a step of impregnating a paperboard with a flameproofing agent mixed with a penetration promoter that promotes the penetration of the flameproofing agent for impregnation, and producing a flameproof processed paper Applying a flameproofing agent for impregnation on one or both sides of the cardboard, and a flameproofing adhesive mixed with a flameproofing agent on one or both sides of the cardboard coated with the flameproofing agent. And using the flameproofing paper.

  Moreover, you may have the process of sticking the flame-retardant printing paper which has a flame retardance on the surface of the said flame-proof processed paper as an aspect of this invention with the said flame-proof adhesive.

  Furthermore, as one aspect of the present invention, the flame retardant printing paper is determined to be a flame retardant product in a flammability test method defined as at least 45 ° micro burner method or JIS standard A1322, and has a basis weight of 7 to 15. %, A non-coated high-quality paper having a paper density of 1.0 or less or a non-coated fancy paper having a paper density of 1.0 or less may be used.

  According to the present invention, it is possible to provide a corrugated cardboard having a sufficiently high flameproofing performance in practice.

1 is an enlarged cross-sectional view showing a first embodiment of a flameproof cardboard according to the present invention. It is a flowchart figure which shows 1st Embodiment of the manufacturing method of the flame-proof corrugated board based on this invention. It is an expanded sectional view which shows 2nd Embodiment of the flameproof cardboard which concerns on this invention. It is a flowchart figure which shows 2nd Embodiment of the manufacturing method of the flame-proof corrugated cardboard concerning this invention.

  Hereinafter, a first embodiment of a flameproof cardboard and a method for manufacturing the same according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a flameproof corrugated cardboard 1A of the first embodiment is mainly composed of a corrugated cardboard 2 as a base layer, and a flameproof processed paper 3 attached to one or both sides of the corrugated cardboard 2 to provide flameproof performance. It consists of and. Hereinafter, each configuration will be described in detail.

  The corrugated cardboard 2 includes a corrugated core 21 and liners 22 bonded to both surfaces of the core 21. In the first embodiment, as shown in FIG. 1, a double-layered corrugated cardboard is used as the corrugated cardboard 2, but the present invention is not limited to this configuration, and a common single-layer cardboard may be used. Reinforced cardboard may be used.

  In the first embodiment, the flameproofing agent for impregnation is applied to both sides of the cardboard 2 in order to improve the flameproofing performance. This flameproofing agent for impregnation is a flameproofing agent having a composition containing at least a complex compound of phosphorus and nitrogen. Moreover, the flameproofing agent for impregnation is dissolved in water with a predetermined composition and used in the state of a working liquid, and is applied by a brush, a spray or the like. In the first embodiment, the flameproofing agent for impregnation is applied to both surfaces of the corrugated cardboard 2, but the present invention is not limited to this configuration, and is applied only to the surface to which at least the flameproof paper 3 is applied. May be.

  The flameproof paper 3 is obtained by impregnating a paperboard with a flameproofing agent for impregnation. In the first embodiment, as the paperboard, a coating agent is not applied, and an uncoated white ball using fresh pulp on the surface is used. Since it is uncoated, there is nothing to prevent the penetration of the flameproofing agent for impregnation and it is easy to penetrate to a saturated state. Further, by adopting fresh pulp, the smoothness is high, and the ink deposition property and printing workability are excellent. Thus, as the paperboard, an uncoated white ball employing fresh pulp is suitable, but it is not limited to this, and any paperboard that can be easily impregnated with the flameproofing agent for impregnation may be used.

  In the first embodiment, the impregnating flameproofing agent impregnated into the paperboard is the same as the impregnating flameproofing agent applied on both sides of the cardboard 2. That is, it has a composition containing at least a complex compound of phosphorus and nitrogen, and is dissolved in water and used in the state of a working fluid. For this reason, the flameproof processed paper 3 of the first embodiment is manufactured by immersing the paperboard for a predetermined time in a container storing the processing liquid and then squeezing and drying.

  In the first embodiment, the flame retardant for impregnation is mixed with a penetration enhancer that promotes penetration into paperboard. This penetration enhancer is mainly composed of a nonionic surfactant. In general paperboard, starch and synthetic adhesives (polyvinyl alcohol, polyacrylamide, latex, etc.) are often used to increase the strength. However, since such starch has a defect that impedes the penetration of the flame retardant for impregnation, the flame retardant for impregnation can be sufficiently impregnated by mixing the penetration accelerator.

  As described above, in the flameproof corrugated cardboard 1A of the first embodiment, as shown in FIG. 1, the two flameproof papers 3 are pasted with the flameproof adhesive 4 on both sides of the cardboard 2. The flameproof adhesive 4 is obtained by mixing an adhesive flameproofing agent with an adhesive in order to enhance the flameproofing performance. In the first embodiment, a vinyl acetate resin emulsion adhesive that hardly burns and has a low odor is used as the adhesive. Moreover, as the flame retardant for bonding to be mixed with the adhesive, a powdery flame retardant mainly composed of halogen and antimony trioxide is used. This is because when the liquid flameproofing agent is mixed with the adhesive, the viscosity is lowered and the adhesive strength is reduced. In other words, a powdery adhesive flameproofing agent is employed in order to improve the flameproofing performance while maintaining the necessary adhesive force.

  In the first embodiment, the flameproof paper 3 is affixed to both sides of the corrugated cardboard 2. However, the present invention is not limited to this configuration, and the flameproof paper 3 is affixed only to one side of the cardboard 2. A flameproof cardboard 1A may be manufactured.

  Next, a method for manufacturing the flameproof cardboard 1A according to the first embodiment and its operation will be described.

  When manufacturing the flameproof corrugated cardboard 1A of the first embodiment, first, as shown in FIG. 2, the paperboard is dipped in an impregnation tank or the like in which a working fluid in which the flameproofing agent for impregnation is dissolved is stored, A flame retardant is impregnated (step S1). At this time, the penetration enhancer mixed with the flame retardant for impregnation exhibits the action of promoting the penetration of the flame retardant for impregnation into the paperboard. For this reason, even if it is a paperboard using the starch etc. which have a penetration inhibitory effect, the flameproofing agent for impregnation can be impregnated to a saturated state in a short time.

  Subsequently, the paperboard impregnated with the impregnating flameproofing agent is squeezed with a drawing machine such as mangle (step S2). Thereby, the excess processing liquid is removed, and the flameproof processed paper 3 in which flameproof performance is imparted to the paperboard is manufactured.

  Next, the flameproofing agent for impregnation is applied to both surfaces of the cardboard 2 by spraying or the like (step S3). Thereby, the flameproofing agent for impregnation penetrates into the liners 22 constituting both surfaces of the cardboard 2 and improves the flameproofing performance.

  Subsequently, after applying the flameproof adhesive 4 to both sides of the corrugated cardboard 2 coated with the flameproofing agent for impregnation (step S4), the flameproofed paper 3 is bonded to each side one by one (step S5). Thereby, the flameproof processed paper 3 containing the flameproofing agent for impregnation, together with the flameproofing adhesive 4 containing the flameproofing agent for bonding, exhibits an excellent flameproofing effect on both sides. For this reason, even if one side of the flameproof processed paper 3 is torn by the flame, air is insufficient unless the other side is torn, and further fire spread is prevented.

  In the first embodiment, since the flame retardant for bonding is in the form of powder, the viscosity and adhesive strength of the flame retardant adhesive 4 are not reduced. Further, in the first embodiment, the use of the vinyl acetate resin emulsion adhesive reduces the odor without reducing the flameproof performance.

  Finally, the corrugated cardboard 2 and the flameproof paper 3 bonded to each other are pressed with high heat by a hot press or the like, and dried in a state close to natural drying by a drying device based on an air stream drying method. (Step S6). Through the above steps, the flameproof cardboard 1A with sufficiently improved flameproof performance is manufactured.

According to the first embodiment as described above, the following effects can be obtained.
1. A sufficient flameproof performance can be imparted to the cardboard 2.
2. It is possible to manufacture a flameproof cardboard 1A that satisfies the flameproof performance standards defined in the Fire Service Law.
3. Since it has high flameproof performance, it is suitable for use as a display panel, a partition in a disaster shelter, a partition panel, a confidential document box, and the like.

  Next, specific examples of the flameproof cardboard 1A according to the present invention and the manufacturing method thereof will be described.

  In Example 1, an experiment for producing a flameproof corrugated cardboard 1A according to the present invention and confirming how much flameproof performance it has was conducted.

In Example 1, first, Nonen 600 as a flame retardant for impregnation (manufactured by Maruhishi Oil Chemical Co., Ltd., solid content: 40.0%), water, and Balu 6612 (Maruhishi as a penetration accelerator). (Manufactured by Yuka Kogyo Co., Ltd.) was mixed with the following composition to prepare a working fluid.
Nonen 600: 60.0%
Water: 39.5%
Valu 6612: 0.5%

Next, as the paperboard, two types of commercially available uncoated paper A (weight per unit: 447.6 g / m ² ) and commercially available non-coated paper B (weight per unit: 473.1 g / m ² ) were prepared. The non-coated paper A was immersed in the processing liquid for 2 minutes, the non-coated paper B was immersed in the processing liquid for 4 minutes, and both were impregnated with a flameproofing agent until saturated.

Subsequently, the non-coated paper A and the non-coated paper B pulled up from the processing liquid were respectively applied to the mangle, and excess processing liquid was squeezed with a pressure of 1 kgf / cm ² . Then, it dried for about 10 minutes under the temperature of about 80 degreeC, and the flame-proof processed paper 3 was manufactured.

  The adhesion rate of the flameproofing agent for impregnation was calculated for a total of 12 flameproof processed papers 3 (board Nos. 1 to 12) obtained by the above steps. The results are shown in Table 1.

  The squeezing rate in Table 1 indicates the ratio of the initial weight to the value obtained by subtracting the initial weight from the WET weight. The theoretical adhesion rate is a value obtained by multiplying the squeezing rate by the solid content ratio of the flame retardant for impregnation in the working fluid. In Example 1, since 60.0% of nonene 600 having a solid content of 40.0% is blended in the processing liquid, the solid content ratio of the flame retardant for impregnation in the processing liquid is 24/100. is there.

Subsequently, 200 g / m ^{2 of the} above processing solution was sprayed onto both surfaces of six double-layer reinforced cardboards (manufactured by Oji Interpack Co., Ltd.) prepared as corrugated cardboard 2. On the other hand, CF530N (viscosity manufactured by Konishi Co., Ltd., viscosity 3000 ± 1000 [mPa · s / 23 ° C.], pH 4.0 ± 1.0) prepared as a vinyl acetate resin emulsion adhesive is flameproof for adhesion. Nonnene SAN-2 (manufactured by Maruhishi Oil Chemical Co., Ltd., solid content 100.0%) and water as an agent were mixed in the following composition.
CF530N: 74.0%
Nonen SAN-2: 13.0%
Water: 13.0%

Then, the both surfaces of the cardboard 2, was coated with a roller flameproofing adhesive 4 by the formulation by 100 g / m ^2, it was bonded the flameproofing paper 3 on the both sides and flameproof cardboard 1A. Thereafter, the flameproof corrugated cardboard 1A was pressed with high heat by a hot press machine and naturally dried.

  Combustion test (common name: 45 ° Meckel burner) based on the flameproof performance test standard established by the Japan Flameproof Association for six flameproof corrugated boards 1A (corrugated board 2No.A to F) manufactured by the above process Act). Specifically, first, as a pretreatment, each flameproof cardboard 1A was dried in a constant temperature dryer at a temperature of 40 ° C. for 24 hours and then allowed to cool in a desiccator.

  Subsequently, with each flameproof cardboard 1A inclined at 45 degrees, a 65 mm flame was applied to the combustion surface from below and heated for 2 minutes. Thereafter, the afterflame time, the residual time, the carbonization area, and the presence or absence of smoke 15 minutes after completion of the test were evaluated for each flameproof cardboard 1A. The results are shown in Table 2.

  In addition, as shown in Table 2, no. No. A shown in Table 1 is applied to the flameproof corrugated cardboard 1A. 1 and no. No. 2 flame-resistant paper is affixed. 1 flame-proof paper was used as the combustion surface. Similarly, no. In each of the flameproof corrugated boards 1A of BF, No. 3,5,7,9,11 flameproof paper was selected as the combustion surface.

As a result of the combustion test, as shown in Table 2, the afterflame time was 0 second, and “10 seconds” as the evaluation standard was cleared. The remaining time is No. Except for A, all are 0 seconds. A was significantly below the evaluation standard of “30 seconds”. Further, the carbonization area was less than half of “70 cm ² ” which is the evaluation standard. Further, any flameproof corrugated cardboard 1A was not allowed to emit smoke after 15 minutes, and was comprehensively judged as acceptable. These results can be said to be extremely high even when compared with conventional corrugated cardboard that is said to have flameproof performance.

  According to the above Example 1, it was shown that the flameproof cardboard 1A according to the present invention sufficiently satisfies the flameproof performance standard defined in the Fire Service Law. Moreover, it was shown that the flameproof cardboard 1A that satisfies the flameproof performance standards defined in the Fire Service Law can be manufactured by the method for manufacturing the flameproof cardboard 1A according to the present invention.

  Next, a second embodiment of the flameproof cardboard 1B and the manufacturing method thereof according to the present invention will be described. Note that, in the second embodiment, the same or equivalent configurations and steps as those of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The feature of the second embodiment is that the flameproof corrugated cardboard 1A of the first embodiment is further laminated with a flame retardant printing paper 5 having both high flame retardancy and good printing characteristics. is there. Specifically, as shown in FIG. 3, the flameproof cardboard 1B of the second embodiment is mainly attached to the corrugated cardboard 2 serving as a base layer and one or both surfaces of the cardboard 2 to provide flameproof performance. It is comprised from the flameproof paper 3 and the flame-retardant printing paper 5 affixed on the surface of this flameproof paper 3. FIG. Hereinafter, the flame-retardant printing paper 5 will be described in detail.

  In general, characteristics such as flame retardancy, flame resistance or fire resistance are expressed as flame retardancy in the Building Standard Law and flame resistance in the Fire Service Law. “Flame” and “flameproof” are treated as synonymous with each other. For example, flame retardant includes flame retardant, flame retardant includes flame retardant, and flame retardant printing paper 5 includes flame proof printing paper. It shall be.

  In recent years, the demand for flame retardancy, fire resistance or fire resistance is not limited to building materials, but is used for flyers and posters that are placed and displayed inside buildings, as well as general office printing paper, etc. Various attempts have been made in response to such requests.

  However, many of the papers produced by conventional methods are difficult to meet recent demands that require more stringent flame retardancy. In addition, almost no printing paper having both printing properties such as printing ink paste and printing clarity and flame retardancy has been obtained. Furthermore, methods that increase flame retardancy, such as by changing the composition of the paper itself, require some changes in the paper manufacturing process, but usually paper is produced on a large scale and in large quantities using huge equipment. Therefore, even if a part of the manufacturing process is changed, there is a possibility that a considerable production cost is increased.

  Therefore, as a result of intensive research and trial and error, the inventor of the present application has found that the existing printing paper can be applied to a method for producing a simple flame-retardant printing paper 5 that can be applied to already produced printing paper. Among them, it has been found that there are printing papers in which flame retardancy is improved by impregnation with a flame retardant and printing characteristics are not impaired, and that high flame retardancy and printing characteristics can be satisfied at the same time.

  Specifically, the flame-retardant printing paper 5 used in the second embodiment is determined to be a flame-retardant product in at least a 45 ° micro burner method or a flammability test method defined as JIS standard A1322. is there. Further, the flame-retardant printing paper 5 includes a flame retardant containing a nitrogen-based compound having a dry weight corresponding to 7 to 15% of the basis weight as an active ingredient, and has a paper density of 1.0 or less. Is a non-coated fancy paper having 1.0 or less.

  In addition, printing paper is usually coated with coated paper (coated paper), fine coated paper, and such pigments that have been coated with a coating solution made by adding a binder to a white pigment on the surface to improve surface smoothness. It is roughly classified into information paper such as uncoated (uncoated) paper, fancy special printing paper, photosensitive paper and thermal paper. Furthermore, the coated paper is divided into art paper, coated paper, lightweight coated paper, and other coated printing paper, the fine coated paper is divided into a semi-high quality base and a medium quality base, and the non-coated paper is classified as an advanced / intermediate / Divided into lower grade printing paper and thin leaf printing paper. These are processed and used in various ways so as to have functions suitable for the properties of ink used in printing, the texture of paper, and other various uses. Greatly surpasses the type.

  In the second embodiment, the flame-retardant printing paper 5 is used to print documents, posters, flyers and other printed materials using a printing machine, printer, etc. at ordinary printers, various offices, schools or general households. The non-coated high-quality paper having a paper density of 1.0 or less or the non-coated fancy paper having a paper density of 1.0 or less is selected from the paper used in the process, and is further processed. The paper density is more preferably 0.8 or less.

  In this 2nd Embodiment, the flame retardant which uses a nitrogen-type compound as an active ingredient is 1 type of an inorganic type flame retardant, and provides a flame-proof property to textiles, wood, shoji paper, paperboard, a car seat, etc. It is widely used for the purpose. Examples of nitrogen compounds include ammonium polyphosphate, polyphosphate amide, ammonium polyphosphate amide, melamine polyphosphate, melamine modified ammonium polyphosphate, melamine modified polyphosphate amide, melamine modified ammonium polyphosphate amide and guanidine phosphate, alkyl acidity Mention may be made of phosphate esters, monoammonium phosphate, diammonium phosphate, guanidine sulfamate, and guanylurea phosphate.

  The flame retardant usable in the second embodiment is a flame retardant containing at least one or two or more of the nitrogen-based compounds exemplified above. Most of these flame retardants are commercially available in the form of aqueous solutions, aqueous dispersions or aqueous emulsions with concentrations ranging from 40 to 80% by weight. In the second embodiment, an aqueous liquid containing these commercially available flame retardants (hereinafter referred to as a flame retardant aqueous liquid) can be used as it is. As described above, the flame retardant includes those described as flame retardants.

  In the second embodiment, a preferable example of the flame retardant containing a nitrogen-based compound is a flame retardant aqueous liquid containing guanidine phosphate as an active ingredient. For example, the “Nonen” series flame retardant (http://marubishi.jp/w2pr/n_list.htm) manufactured by Maruhishi Oil Chemical Co., Ltd. and the “Apinon” series manufactured by Sanwa Chemical Co., Ltd. Nonnene 600 is particularly preferable.

  The flame-retardant printing paper 5 can be produced by applying the necessary amount of the flame retardant aqueous liquid on the printing paper or after immersing the printing paper in a flame retardant aqueous liquid having an appropriate concentration for the necessary time. It can be produced by drying the paper. What is necessary is just to set the dry weight of the flame retardant to contain suitably according to the density | concentration of the flame retardant contained in the basic weight of printing paper, the area of paper, and the flame retardant aqueous solution to be used. In addition, the density | concentration of the flame retardant contained in a flame retardant aqueous liquid is prepared in the range of 40 to 80 weight% normally.

  As a method of impregnating the flame retardant, coating is preferable from the viewpoint of drying efficiency. The application may be performed continuously using a general paper coating machine (called a coater or a coating machine), or may be performed using a hand tool such as a brush or a spray. In the case of coating, if the amount of the flame retardant aqueous liquid used is small, it becomes difficult to uniformly impregnate the flame retardant on the printing paper, while if the amount of the flame retardant aqueous liquid used is large, subsequent drying will take time. It is preferable to adjust the concentration of the flame retardant and the amount of the aqueous liquid in accordance with the area of the printing paper to be used.

  On the other hand, when impregnating the flame retardant by dipping, it is preferable from the viewpoint of drying efficiency to immerse the printing paper in a high concentration flame retardant aqueous liquid for a short time.

  The printing paper impregnated with the flame retardant may be dried by the same method as the drying of the coated paper whose surface smoothness is improved by applying a coating liquid. However, it is preferably dried by a hot press method or an air stream method for drying a sheet-like article such as plywood or paper.

  In particular, the sheet-like article is dried using a drying method including a step of sandwiching the sheet-like article with a pair of planar bodies and a step of supplying heat from the thickness direction to generate convection along the plane direction of the sheet-like article. It is preferable. By using these drying methods, it becomes difficult for wrinkles and kinks to occur on the printing paper after drying, and the convenience as printing paper can be enhanced.

  The flame-retardant printing paper 5 of the second embodiment having the above-described characteristics has a flame retardancy determined to be a flame-retardant product in a flammability test method defined as at least 45 ° micro burner method or JIS standard A1322. Have.

  Here, the 45 ° micro burner method was established by the Japan Flame Retardant Association, “Tents, sheets, curtains, emergency carry-out bags, automobile / motorcycle and other body cover thin cloths (thick cloths), This test method is defined as a standard for testing flameproof products such as shoji paper, white cloth for altars, protective nets, and wooden blinds. The specific test method is posted on the website of the Japan Flame Protection Association (see http://www.jfra.or.jp/member/s07.html), and the judgment is appropriate or inappropriate. ○ is done by ×.

  The flame retardancy test method defined as JIS standard A1322 is “Flame retardance test method for thin materials for building”, and the specific test method is the website of the Japan Industrial Standards Committee (http: // www.jisc.go.jp/app/pager?id=79527), and Disaster Prevention Level 1 to Level 3 are defined as flame retardant types.

  Therefore, the flame-retardant printing paper 5 of the second embodiment is judged as “◯” by the test by at least 45 ° micro burner method, or “proof” by the judgment by the flame-retardant test method defined as JIS standard A1322. It has flame resistance of “Flame Grade 3” or higher.

  In addition, the flame-retardant printing paper 5 of the second embodiment exhibits excellent printing characteristics for both ink jet printing and offset printing methods. The printing characteristics referred to in the present invention refers to the property that at least ink bleeding does not substantially occur in both ink-jet printing and offset printing, and further, the color development of the ink is clear and does not fade, and fine fonts are also included. It means having a characteristic that can be clearly displayed.

  Specifically, with regard to bleeding, in the case of monochromatic printing, whether the color outline is blurred or not, when printing so that two or more different colors touch each other, one ink is placed on the other at the color boundary. Whether or not both of them are blurred, whether the color is printed lightly or faintly with respect to the color sample, and the font has at least a font size of 8 to 10.5 It is determined visually whether or not the image is printed without being crushed.

  As described above, the flameproof corrugated cardboard 1B of the second embodiment, as shown in FIG. 3, is flame retardant printing paper having flame retardancy on the surface of the flameproof corrugated paper of the flameproof cardboard 1A of the first embodiment. 5 is affixed with a flameproof adhesive 4.

  As in the first embodiment, the flameproof adhesive 4 is a mixture of an adhesive and a flameproofing agent for the purpose of enhancing the flameproofing performance, such as a vinyl acetate resin emulsion adhesive. is there. Further, in the second embodiment, the flame-retardant printing paper 5 is pasted on both surfaces of the flameproof paper 3 stuck on both sides of the cardboard 2, but is not limited to this configuration. You may manufacture the flameproof corrugated cardboard 1B which sticks the flame-retardant printing paper 5 only to one flameproof processed paper 3. FIG.

  Next, a method for manufacturing the flameproof cardboard 1B according to the second embodiment and its operation will be described.

  When manufacturing the flameproof corrugated board 1B of the second embodiment, as shown in FIG. 4, as in the first embodiment described above, the paperboard is impregnated with a flameproofing agent for impregnation (step S1), and the paperboard is squeezed. The machine is squeezed (step S2), the impregnating flameproofing agent is applied to both sides of the cardboard 2 (step S3), and the flameproofing adhesive 4 is applied to both sides of the corrugated cardboard 2 (step S4). The flame processed paper 3 is affixed (step S5).

  Subsequently, as shown in FIG. 3, after applying the flameproof adhesive 4 to each surface of the flameproof paper 3 stuck on the front and back surfaces (step S11), one flame retardant printing paper on each side 5 are pasted together (step S12). Thereby, the flame-retardant printing paper 5 having a high flame retardance, together with the flame-proofing paper 3 and the flame-proof adhesive 4, exhibits an extremely excellent flame-proofing effect on both sides.

  In addition, since the flame-retardant printing paper 5 has excellent printing characteristics, it is possible to print various characters, graphics, and the like on both sides of the flameproof cardboard 1B by inkjet printing or offset printing. For this reason, a suitable pattern can be given to the flameproof cardboard 1B according to the scene and application in which the flameproof cardboard 1B is used.

  Finally, the corrugated cardboard 2, the flameproof paper 3 and the flame-retardant printing paper 5 bonded together are pressed with high heat by a hot press machine or the like, and by a drying device or the like based on an air stream drying method, Drying is performed in a state close to natural drying (step S6). Through the above steps, the flameproof cardboard 1B with further improved flameproof performance is manufactured.

According to the second embodiment as described above, the following effects can be obtained in addition to the effects of the first embodiment described above.
1. The flameproof performance of the flameproof cardboard 1B can be further improved.
2. It can have high flame retardancy determined to be a flame retardant product in at least a 45 ° micro burner method or a flammability test method defined as JIS standard A1322.
3. The printing characteristics of the flameproof cardboard 1B can be improved.
4). Even if ink jet printing or offset printing is performed, blurring or blurring does not occur and clear printing can be performed.
5. It is possible to produce an excellent flame-retardant printing paper 5 by applying a flame retardant to ready-made printing paper and let it dry naturally, and to improve the flame retardancy and printing characteristics at low cost. it can.

  Next, specific examples of the flameproof cardboard 1B according to the present invention and the manufacturing method thereof will be described.

  In Example 2, a stock solution of a flame retardant “Nonen 600” (pH 5.2 to 5.8, 40% aqueous solution) manufactured by Maruhishi Oil Chemical Co., Ltd. was used for 10 types of printing paper ( All were spray-coated on one side of A4 size, 624 cm 2). The impregnation amount of the flame retardant was determined by calculating so that the dry weight of the impregnated flame retardant was equivalent to 10% of the basis weight of each paper, taking into account the paper area. Then, it dried for 4 hours with the hot press dryer heated at 40 degreeC, and produced the printing paper which a flame retardant impregnated.

  The degree of impregnation of the flame retardant aqueous liquid in each printing paper was determined visually. The evaluation was carried out based on whether or not the printing paper after drying was unevenly infiltrated with the flame retardant aqueous liquid. Moreover, the flame retardance test by 45 degree micro burner method was done with respect to each printing paper.

  Further, ink jet color printing with a pigment-based aqueous ink was performed on each printing paper using an Epson large format printer, and the printing characteristics were visually evaluated. The evaluation was carried out by visual determination of the presence and degree of blurring of printing and the fading of the printing color, and the clarity of characters with a font size of 10.5. Table 3 shows the degree of impregnation of the flame retardant, the printing characteristics, and the results of flame retardancy.

  As shown in Table 3, all coated papers are impractical as flame retardant printing paper 5 such as non-uniform impregnation of flame retardant, unevenness, or significant printing bleeding. On the other hand, both the uncoated high-quality paper having a paper density of 1.0 or less or the non-coated fancy paper having a paper density of 1.0 or less are excellent in impregnation and printing characteristics, and are practical as flame-retardant printing paper 5. It had the characteristic. Moreover, all of these were excellent in flame retardancy.

  According to the above Example 2, it was shown that the flameproof corrugated cardboard 1B according to the present invention is provided with the flame retardant printing paper 5 having high flame retardancy and excellent printing characteristics on the surface.

  Each embodiment mentioned above is for making an understanding of the present invention easy, and does not limit flameproof corrugated cardboard 1A and 1B concerning the present invention, and a manufacturing method for the same. The present invention can be modified and improved as appropriate without departing from the spirit and scope of the claims, and equivalents thereof are included in the present invention.

  For example, in each of the embodiments described above, a flame retardant having a composition containing a composite compound of phosphorus and nitrogen is used as the flame retardant for impregnation, and halogen and antimony trioxide are the main components as the flame retardant for adhesion. However, the present invention is not limited to these, and any flameproofing agent suitable for mixing with a flameproofing agent or an adhesive suitable for impregnation may be used.

1A, 1B Flameproof cardboard 2 Corrugated cardboard 3 Flameproof paper (paperboard)
4 Flameproof Adhesive 5 Flame Retardant Printing Paper 21 Core 22 Liner

Claims (7)

Flameproofing paper formed by impregnating a impregnating flameproofing agents in the paperboard, by flame adhesive comprising by mixing an adhesive flameproofing agents in adhesives, it is affixed to one or both sides of cardboard, the anti The surface of the flame-treated paper is a non-coated high-quality paper having a paper density of 1.0 or less or a non-coated fancy paper having a paper density of 1.0 or less, is not coated with a pigment, and has flame resistance. A flameproof corrugated cardboard having a flame retardant printing paper having the flameproof adhesive adhered thereto .   The flameproof cardboard according to claim 1, wherein the flameproofing agent for impregnation is applied to one side or both sides of the cardboard.   The flameproof cardboard according to claim 1 or 2, wherein a penetration enhancer that promotes penetration into the paperboard is mixed with the flameproofing agent for impregnation. The flameproof cardboard according to any one of claims 1 to 3 , wherein the adhesive is a vinyl acetate resin emulsion adhesive. The flame retardant for impregnation is a flame retardant having a composition containing a composite compound of phosphorus and nitrogen, and the flame retardant for adhesion is a powdery flame retardant mainly composed of halogen and antimony trioxide. The flameproof corrugated cardboard according to any one of claims 1 to 4 . A step of impregnating a paperboard with a flameproofing agent mixed with a penetration enhancer that promotes the penetration of the flameproofing agent for impregnation, and producing a flameproof processed paper;
Applying a flame retardant for impregnation on one or both sides of the cardboard;
Applying the flameproof processed paper to one or both sides of the cardboard coated with the impregnation flameproofing agent using a flameproof adhesive mixed with an adhesive flameproofing agent ;
Non-coated high-quality paper having a paper density of 1.0 or less or non-coated fancy paper having a paper density of 1.0 or less on the surface of the flameproof paper, which is not coated with a pigment, and is flame retardant A method for producing a flameproof cardboard, comprising a step of affixing a flame retardant printing paper having the above with a flameproof adhesive . The flame-retardant printing paper includes a step of sandwiching a pair of planar bodies from the front and back directions after impregnating the flame retardant, and a step of supplying heat from the thickness direction to generate convection along the surface direction. The manufacturing method of the flame-proof corrugated cardboard of Claim 6 dried using the drying method.

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