JPH09228300A - Resin-reinforced paper fiber board and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper board which has superior strength and surface smoothness to a wood plate of the same thickness and excellent processability, despite that paper fibers are used as a material. SOLUTION: Paper fibers 11 are bound with a resin 12 almost uniformly dispersed in them to form a paper fiber board in which the content of the paper fiber 11 is adjusted to 20-80wt.% and the amount of the resin 12 is set to 20-80wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper fiber board in which a resin is uniformly mixed with a paper fiber to be a general paper to strengthen the paper fiber, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A thermosetting resin such as a melamine resin is impregnated into a core paper which has been conventionally used as a surface mounting material such as a table top plate, and the thermosetting resin is thermoset. There is known a resin-curable fiber board which is integrated by making it. Such resin-curable fiberboard,
Since the paper must be uniformly impregnated with the resin, or the impregnated resin must be cured uniformly, a very large mold must be prepared, and even if the resin is cured, it is very difficult. It took a long time and was costly.

In the conventional resin-curable fiber board produced in such a difficult manner, if there was "variation" in the impregnated amount of the resin, the strength was inferior. Moreover, what is cured with a thermosetting resin such as melamine resin may have an advantage that it is less likely to be "scratched" when used as a table top plate, On the contrary, it has the disadvantage of being inferior in workability. That is, the conventional resin-curable fiberboard could hardly be used as a woodblock for printing.

On the other hand, thick paper such as so-called cardboard is formed by simply thickening paper fibers, but it is generally difficult to firmly bond the paper fibers by papermaking. Therefore, the finished cardboard was inferior in strength. In other words, such a cardboard could hardly be used as, for example, a table top plate, a building cover material or a structural material, or a woodblock for a print.

As for the exterior material of a building, especially in a room, an exterior material formed by peeling wood to a certain thickness and laminating the wood is used, but its strength is the base. It was not so expensive because it was secured by thin timber. Also, if you use a thin laminate of wood, the "eyes" of the wood will appear on the surface as they are, so there is an advantage that you can use the beauty of the "eyes" as it is, but many of these laminates When arranging them, it is necessary to align them, and depending on the case, "stripping" occurs depending on the eyes, so that it was necessary to be careful during processing such as cutting.

[0006] Further, considering a wood plank for prints, for example, it is usually formed by using a material whose eyes are not very clear, such as Yamazakura, Tsugu, and hoo, and its surface is smooth. The ones that are easy to engrave are used. Since the material that should be used for such woodblocks is natural, even if the eyes are not clear, there is some directionality, that is, there is a direction that is easy to engrave and a direction that is not. . In addition, it is the actual situation that the number of logs such as phoenixes that should be this woodblock is decreasing, and the price is increasing.

On the other hand, in recent years, so-called thinned wood has been increasing, and there is no good plan for its treatment, and it is said that it is wasted. In other words, especially in Japan, many trees were planted for the purpose of nation-building after the war.
As a result of this afforestation, trees that cannot be used as building materials are now appearing in large quantities as thinned wood.

Not only that, but in recent years, a large amount of materials that can be used as paper, that is, materials from which paper fibers can be taken out, appear not only in the above-mentioned thinned wood, other softwood and hardwood, but also in so-called used paper. However, the materials that can be used as these papers have not been effectively used. The main reason for this is that economically viable processing means have not been established, and the problem of making collection of materials difficult has also arisen from that, and the actual situation surrounding paper is a vicious cycle. It can be said that

The present inventor has completed the present invention as a result of various studies as to whether or not the above-mentioned actual condition can be improved by the technique of paper.

[0010]

SUMMARY OF THE INVENTION The present invention has been made based on the above-described background, and the problem to be solved is that paper fibers can be effectively used and are excellent as products. It is to provide a board and to break the vicious circle surrounding paper.

That is, first of all, the object of the invention according to claim 1 is that, while using paper fiber as a material, it has strength and surface smoothness superior to, for example, a plate material of the same thickness, and has excellent workability. Is to provide an excellent paper fiberboard.

The object of the invention according to claim 2 is to achieve the object of the invention according to claim 1, and to further improve the workability in the case of, for example, a woodblock. The object is to provide a paper fiber board that can be used.

An object of the invention according to claim 3 is to provide a method by which the paper fiber board according to claim 1 or 2 can be manufactured concretely and surely. .

[0014]

In order to solve the above-mentioned problems, the means adopted by the invention according to claim 1 will be described with reference to the reference numerals used in the description of the embodiments below. A paper fiber board (10) in which paper fibers (11) are bound by a resin (12) dispersed substantially uniformly therein, wherein the content of the paper fibers (11) is 20 to 80% by weight, and the resin (12) is 20 to 80% by weight based on the paper fiber 11 is a resin-reinforced paper fiber board 10 ″.

That is, the paper fiber board 1 according to claim 1
Reference numeral 0 denotes a paper fiber 11 typified by a pulp fiber, which is plate-shaped with a resin 12 dispersed therein by, for example, the manufacturing method of claim 3 described later, and the resin 12 inside
It is made of resin.

In making the paper fiber board 10, the ratio of the paper fiber 11 to the resin 12 described later is 20% by weight.
It is necessary to be ~ 80% by weight because the reason is 2
If the amount is less than 0% by weight, sufficient strength and rigidity cannot be imparted to the paper fiber board 10 after completion, and the cut surface cannot be made smooth when processed with, for example, a saw or a chisel. This is because it will end up. On the other hand, if the paper fiber 11 is more than 80% by weight with respect to the resin 12, not only the surface of the paper fiber board 10 after completion cannot have sufficient smoothness, but also the resin 12 This is because it is difficult to sufficiently integrate the paper fiberboard 10 to be used as a cover material or a woodblock because the amount of the above is relatively small.

Further, 20 wt% to 80 wt% of the resin 12 is required for the paper fiber 11 as described above. The reason is that if the amount is less than 20 wt%, the paper fiber 11
If it is more than 80% by weight, the amount of the paper fiber 11 is relatively reduced so that the paper fiber board 10 does not sufficiently exhibit the properties of the paper fiber 11. This is because not only will it disappear, but more workability will be imparted by giving more strength than necessary.

Although it is generally difficult to make the fiber lengths of the paper fibers 11 uniform, in the paper fiber board 10 of the present invention, the paper fibers 11 are in the fiber length range of 1 mm to 20 mm. convenient. The reason is that if the fiber length is shorter than 1 mm, the completed paper fiber board 10 cannot have sufficient strength. On the other hand, when the fiber length of each paper fiber 11 is longer than 20 mm, the paper fibers 11 in the dispersion liquid at the time of papermaking the paper fiber board 10 are entangled with each other to form a dango, which makes it difficult to perform uniform papermaking. Because it will be. Above all, when the paper fiber 11 has a fiber length centered at 13 mm, the entanglement of each paper fiber 11 after dispersion can be extremely reduced, and the paper fiber 11 in the thickness direction in the completed paper fiber board 10 can be reduced. It is very advantageous that the amount of paper fibers 11 present can be increased.

Various kinds of resin can be applied as the resin 12 for forming the paper fiber board 10.
A thermosetting resin is particularly suitable as the resin 12 because it has excellent processability for achieving 0. In order to obtain a paper fiber board 10 having a thickness suitable for the purpose of use, first, a paper fiber board 10 having a thickness that facilitates papermaking is formed, and a predetermined number of the paper fiber boards 10 are stacked and heated and pressed. It should be integrated. In this case, it is also possible to use a resin adhesive between the layers or use the resin 12 itself already contained in each paper fiber board 10 as the adhesive.

In the paper fiber board 10 configured as described above, not only the paper fibers 11 are uniformly dispersed, but the paper fibers 11 are firmly integrated by the resin 12, so that the entire paper fiber board 11 is formed. Has extremely high rigidity and strength, and is 3 to 20 times stronger than a natural wood board of the same thickness.

Further, in this paper fiber board 10, the paper fibers 11 have a fiber length in the above-mentioned range and are integrated by the resin 12, so that
There is no so-called fluffy surface, and the surface has very excellent surface smoothness. Therefore, although the paper fiberboard 10 does not have the beauty of "wood grain", it has a natural and warm feeling that plants such as trees have, so that it can be used as a cover material for wall materials, for example. When used as a material, it is possible to foster a peaceful feeling to the people living there.

Further, since the paper fiber board 10 enables the use of a large amount of paper fibers 11, and is of any type regardless of the fiber length, it is difficult to treat in recent years. It is possible to use a large amount of thinned wood and waste paper. In particular, the paper fiberboard 10 according to the present invention
Can make the physical properties of the paper fiber 11 very uniform, regardless of the type of the paper fiber 11, which is very advantageous not only for resource conservation but also for industry. It has become a thing.

On the other hand, in order to solve the above-mentioned problems, the means adopted by the invention according to claim 2 is as follows.
The paper fiber board 10 according to the present invention has an inorganic powder and a colorant added thereto, and is a paper fiber board 10 in which a predetermined number of these are stacked and integrated.

That is, the paper fiber board 1 according to claim 2
0 has an appearance as shown in FIG. 2, for example, and the color is different in each layer depending on the added coloring agent. When the paper fiberboard 10 configured in this way is used as a woodblock, if the surface layer is carved with a chisel,
As shown in Fig. 2, the one just engraved will come out. On the other hand, the added inorganic powder improves the sliding of the blade when the paper fiber board 10 is machined. Therefore, the paper fiber board 10 is not only easy to cut with a carving knife on the surface layer as described above, but can also make the cut picture or character 13 clear, and to produce a print. This can be made even easier.

In other words, for example, the paper fiber board 10 shown in FIG. 2 is formed by integrating the uncolored paper fiber board 10b on both sides of the central colored paper fiber board 10a. By cutting the non-colored paper fiberboard 10b on the side, the colored paper fiberboard 10a that was inside can be brought to a floating state as shown in the picture or character 13 shown in FIG. Even without it, the production of prints will be sufficient. Of course, when such a paper fiberboard 10 is used as a surface material such as a wall material, if the uncolored paper fiberboard 10b on the surface is cut to some extent, the colored paper fiberboard 10a inside is partially removed. It is possible to make it excellent in terms of design.

Further, for example, the colored paper fiberboard 10a having seven different colors is centered on the surface of the colored paper fiberboard 10a.
0b arranged and laminated to form a paper fiberboard 1
If 0 is used as a surface material, a rainbow-colored picture or character 13 can be easily formed by adding a plane having a curved blade to the surface material. In this case, since the paper fiber 11 has the fiber length described above,
The paper fiber 11 does not get fluffy and is very beautiful, and it is possible to form a picture or character 13 as the user desires.

The paper fiber board 10 as described above is manufactured by, for example, a method according to claim 3, that is, "a paper fiber 11 is added to an aqueous medium and dispersed therein, and the paper fiber 11 is dried by a dry weight. After preparing the dispersion liquid by adding 20 to 80% by weight of the resin 12, a paper fiber sheet is made from the dispersion liquid by a papermaking method, and heat and pressure are applied thereto to cure the resin 12. By integrating the paper fibers 11 with each other, it is possible to easily and surely manufacture.

In this manufacturing method, it is particularly necessary to use the resin 12 having a particle size of 1 μm to 2 mm. The resin 12 having such a particle size is used not only for the purpose of stably performing the work in the final heating and pressurization of the plate-shaped paper fiber board 10 and facilitating the mold release. This is to make the physical properties of the paper fiber board 10 after completion better than that of wood. Further, the particle size is 1 μm to 2
It is necessary to use the resin 12 having a size of 1 mm is 1 μm
This is because the resin 12 having a smaller particle size is not only expensive, but also cannot be sufficiently attached to the paper fibers 11 for binding the paper fibers 11 to each other. On the other hand, with the resin 12 having a particle size larger than 2 mm, the dispersion in the dispersion liquid for papermaking cannot be performed well.

The ratio of the resin 12 to the paper fiber 11 needs to be set to 20% by weight to 80% by weight in the resulting product. The reason for this is that the paper fiber board 10 according to claim 1 above. As explained.

As such a resin 12, phenol, melamine, urea and epoxy are specifically adopted as the thermosetting resin. Also, the thermoplastic resin 1
Polyethylene or polypropylene is specifically used as 2. In addition, such a resin 12 in the form of powder or granules having a size of about 1 μm to 20 mm as described above can usually be satisfactorily dispersed in an aqueous medium such as a dispersion liquid for papermaking. Although not available, it is advisable to adjust the slurry by adding 0.1% by weight of a surfactant to water. Furthermore, by adding polyethylene oxide, which is a polymer flocculant, to this slurry to improve the viscosity, even the resin 12 having a particle diameter of about 2 mm can be sufficiently dispersed in an aqueous medium. is there.

Specifically, it is preferable to add a 0.2% to 2% polyethylene oxide solution to the above-mentioned solution in which the paper fibers 11 are dispersed to obtain an aqueous medium having an increased viscosity.
Since this polyethylene oxide improves the viscosity of the aqueous medium, it can not only improve the dispersibility of the paper fiber 11 and the resin 12 in the aqueous medium, but also prevent recombination of the dispersed paper fiber 11. Is. In addition, this polyethylene oxide is hydrolyzed by dispersing it in water and applying a pressure (specifically, mechanical stimulus such as agitation at the time of papermaking or pumping up by a pump) or a stimulus such as an ultraviolet ray to easily hydrolyze it. It becomes degradable polyethylene glycol, and at this time, it lowers the viscosity of the aqueous medium.

In particular, this polyethylene oxide remains as polyethylene glycol in the waste liquid,
Since this polyethylene glycol is harmless enough to be used as a base material for cosmetics, the waste liquid treatment can be easily performed by means such as biodegradation.

Such polyethylene oxide may be mixed in an aqueous medium at 0.2% to 2%. The reason is that if it is less than 0.2%, sufficient dispersibility of the paper fiber 11 and the resin 12 resin in the aqueous medium cannot be obtained, and if it is more than 2%, such effect is obtained. Because we can't expect. Among them, mixing about 1% in the aqueous medium is the most efficient in terms of effect and cost.

With respect to the dispersion liquid in which the above materials are dispersed, a sheet in which the resin 12 is uniformly dispersed in the glass fiber entangled in a three-dimensional mesh is made into paper by using a general paper making machine. This is applied to a heating / pressurizing machine to form the paper fiber board 10. As a result, the resin 12 in the sheet is hardened by heating and enters between the paper fibers 11 without any gap, and the paper fibers 11 are made to have a uniform thickness by pressurization. Thus, the paper fiber board 10 having smoothness and high strength is completed.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the invention according to each claim will be described. Here, a description will be given focusing on a manufacturing method according to claim 3. This is because the paper fiber board 10 according to claim 1 or 2 is specifically formed by carrying out the method according to claim 3.

First, 2 kg of waste paper in 100 liters of water
Was added and defibrated with a mixer to form a solution of only the fiber 11. In the solution of the paper fiber 11, the average particle size is 10 μm
Approximately 5 by adding approximately the same amount of phenolic resin powder as paper fiber 11.
Stirred for minutes. After that, by adding 0.3% by weight of a polymer flocculant to this stirring solution, the above-mentioned phenol resin powder was evenly adhered between each paper fiber 11, and after confirming this, this slurry was generally used. A sheet having a heat of about 3 mm was made into paper by using a different paper machine. This sheet was pressed with a pressurizer to squeeze out water to obtain a raw sheet having a heat of 2 mm, and the raw sheet was dried with a dryer.

The dried sheet thus obtained is further heated and pressed.
Machine pressure is 5Kgf / cm ^TwoAnd the heating temperature is 1
Pressed at 80 ° C. This allows all parts
In minutes, a paper fiberboard 10 having a thickness of 1.2 mm was obtained. Profit
The paper fiberboard 10 thus formed has a paper fiber 11 on its entire surface.
No "fluffing" was seen, and the bulk density was 0.67g.
/ Cm^ThreeAnd the basis weight is 700 g / cm^TwoHas become
Was. The average bending strength of this paper fiber board 10 is 380
Kgf / cm^TwoMet.

The aqueous medium after the paper fiber board 10 is formed is temporarily stored in a tank as a waste liquid, and a petroleum degrading bacterium such as Candida or lipolotica is added to the aqueous medium for hydrocarbon fermentation. Polyethylene glycol in the aqueous medium was easily decomposed. Of course, the fine paper fibers 11 and the resin 12 are completely removed by another general physical treatment. Therefore, the treatment of the waste liquid generated in the production of the paper fiber board 10 of the present invention does not require such a large facility, and it is safe and easy to utilize the petroleum degrading bacteria which are inexpensive and easily available. It can be done without much cost.

[0039]

As described above in detail, first, in the invention according to claim 1, "a paper fiber board 10 in which a paper fiber 11 is bonded by a resin 12 dispersed substantially uniformly therein, The content of the paper fiber 11 is 20 to 80% by weight, and the resin 12 is added to the paper fiber 11 at 20% by weight.
-80% by weight "is a characteristic of its constitution, which allows a plate material of the same thickness to have more excellent strength and surface smoothness while being made of paper fiber as a material, and to be processed. It is possible to provide a paper fiber board having excellent properties.

The invention according to claim 2 is characterized in that the paper fiber board 10 according to claim 1 is added with an inorganic powder and a colorant and a plurality of these are laminated. As a result, it is possible to provide a paper fiber board which can further improve the processability when it is used as a woodblock, for example.

Further, in the invention according to claim 3,
"To the paper fiber 11 added and dispersed in an aqueous medium,
After the thermosetting resin 12 having a dry weight of 20 to 80% by weight is added to the paper fiber 11 to prepare a dispersion liquid, a paper fiber sheet is made from the dispersion liquid by a paper making method, and heat is applied to the paper fiber sheet. And the pressure are applied to cure the thermosetting resin 12 to integrate the paper fibers 11 with each other. "Therefore, the paper fiber board 10 according to claim 1 or 2 is provided. Can be reliably and easily manufactured.

[Brief description of drawings]

FIG. 1 is a partially enlarged plan view of a paper fiber board according to claim 1 or 2.

FIG. 2 is a partially cutaway perspective view of a paper fiber board according to a second aspect of the present invention.

[Explanation of symbols]

 10 Paper fiber board 10a Colored paper fiber board 10b Non-colored paper fiber board 11 Paper fiber 12 Resin 13 Picture or character

Claims (3)

[Claims] 1. A paper fiber board in which paper fibers are bound by a resin in which the paper fibers are substantially uniformly dispersed, wherein the content of the paper fibers is 20 to 80% by weight, and 20-80 resin to the paper fiber
A resin-reinforced paper fiberboard characterized by being used in a weight percentage. 2. A resin-reinforced paper fiberboard comprising a plurality of paper fiberboards according to claim 1 to which an inorganic powder and a colorant have been added. 3. A dry weight of 20 to 80% by weight relative to the paper fiber, which is obtained by adding and dispersing paper fiber in an aqueous medium.
After adjusting the dispersion liquid by adding a resin that becomes a paper fiber sheet from the dispersion liquid by a papermaking method, heat and pressure are applied to the paper fiber sheet to cure the resin to form the paper fiber. A method for producing a resin-reinforced paper fiberboard characterized by being integrated.