JPH09239918A - Laminate and pinball game stand using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate which has characteristics (lightweight, strength, nail extraction resistance, processability) required for a substitute for wood, especially plywood for a pinball game stand board, and is prepared mainly using inexpensive used paper, and provide a pinball stand using the laminate. SOLUTION: In view of costs, lightweight, strength, processability, as well as warpage prevention and nail holding force maintenance, thermosetting moldings of the same type or different types which are composed of 90-50wt.% of a fibrous base material mainly of used paper and 10-50wt.% of a thermosetting resin and have basis weight of 300g/m<2> or more to prevent delimitation are laminated and integrated. Moreover, to be applicable to a substitute for wood, especially plywood for a pinball game stand board, the laminates or the laminates of them in which density is set at 500-900kg/m<3> , flexural strength is set up at 200kg/m<2> or more, and nail extraction resistance is set up at 15kg/cm or more are bonded together in a layer shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated body used as a substitute material for wood-based materials, particularly a lightweight laminated body formed by effectively utilizing waste paper, and a pachinko board using the same.

[0002]

2. Description of the Related Art In the pachinko machine industry, old and new pachinko machines have been frequently replaced in order to secure stable customers, and a huge number of pachinko machines are produced every year. Although plywood has been conventionally used for this pachinko base plate, it is difficult to obtain wood from the viewpoint of worldwide depletion of wood resources and protection of the natural environment, and the price of plywood is expected to rise. On the other hand, a large amount of paper is used due to the proliferation of OA equipment and the increase in newspapers, magazines, books, etc. accompanying the information society, but about 40% of these used papers are collected and reused, but about 40%. Is abandoned. Under such circumstances, promotion of recycling of waste paper and emergence of alternative materials for wood-based materials (plywood) are strongly desired.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has the characteristics required as a substitute material for wood-based materials, particularly plywood for pachinko base plate, that is, lightness,
It has strength, nail pull-out resistance value (hereinafter referred to as "nailing power") and workability (saw workability, machinability such as drill hole drilling property, and nailability), and is made by effectively utilizing inexpensive waste paper. The object of the present invention is to provide a laminated body and a pachinko machine using the same.

[0004]

In order to solve the above problems, the present invention provides (A) a pulverized or disintegrated fibrous base material 90 mainly composed of waste paper from the viewpoint of cost, lightness, strength and processability. -50% by weight and (B) thermosetting resin 10-50
In terms of preventing delamination, the basis weight (weight per 1 m ^{2 of} thermosetting molding) is 300 g / m.
From the viewpoint of securing nail-holding power and preventing warpage, ^two or more thermosetting moldings are laminated and integrated in the same kind or different kinds, and as a substitute material for wood-based materials, especially plywood for pachinko base plate Since it is applicable, the density is 500 ~
The laminate is 900 kg / m ³ , the bending strength is 200 kg / cm ² or more, and the nail holding force is 15 kg / cm or more, or a laminate formed by joining the laminates in layers. Hereinafter, the present invention will be described in detail.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The fibrous base material used in the present invention is mainly composed of waste paper which has been crushed or disintegrated by a disintegrating beating machine such as pulper or Henschel mixer, and if necessary, an organic material. 50% by weight of the total amount of fibrous base material, at least one kind of inorganic or metallic fiber
Less than, preferably 30% by weight or less, more preferably 2
It can be used together at 0% by weight or less. The used paper is not particularly limited as long as it is fiber-based. Examples of such waste paper include plant fiber waste paper such as wood pulp, linter pulp, hemp pulp, and straw pulp, as well as rayon fiber, nylon fiber, vinylidene chloride fiber, polyester fiber, aramid fiber, phenol fiber, and other synthetic fibers. Inorganic fiber-based waste paper such as fiber-based waste paper, carbon fiber, glass fiber, ceramic fiber and the like can be mentioned, and among them, plant fiber-based waste paper is particularly preferable. These may be used alone or in combination of two or more. Preferred plant fiber waste paper varieties include, for example, newspapers, magazine papers, telephone books, book papers, commercial printing papers, drawing papers, towel papers, pulp papers, wrapping papers, recording papers, corrugated papers, and white paperboards. , And paperboards such as yellow paperboard. In addition, the organic matter that can be used together if necessary,
Examples of the inorganic or metallic fibers include wood flour, pulps, cotton, rayon fibers, polyacetate fibers, polypropylene fibers, polyvinylidene chloride fibers, polyester fibers, nylon fibers, aramid fibers, phenol fibers,
Examples thereof include, but are not limited to, glass fiber, carbon fiber, ceramic fiber, silicon carbide fiber, aluminum fiber and copper fiber. These may be used alone or in combination of two or more.

The thermosetting resin used in the present invention has a binder function of thermally curing in the presence or absence of a cross-linking agent to bond and retain the fibrous base material. Examples of the hydrophilic resin include phenol resin, epoxy resin, unsaturated polyester resin, melamine resin,
Examples include urea resins. Above all, a phenol resin having excellent heat resistance, flame resistance and rigidity is preferable. These may be used alone or in combination of two or more.
The thermosetting resin is usually used in the form of powder or fibrous solid, but may be used in the form of a solution, a resin liquid, or a solid-liquid combination as required.

The term "phenolic resin" as used herein means a condensation product of phenols and aldehydes or a modified product thereof, which exhibits thermosetting properties in the presence or absence of a cross-linking agent. Examples of the phenolic resin include novolac type phenolic resin, methylol group-containing novolac type phenolic resin, resol type phenolic resin, nitrogen-containing resol type phenolic resin, benzylic ether type phenolic resin and these phenolic resin and epoxy type compound, xylene type phenolic resin. Examples thereof include a modified phenol resin obtained by mixing or reacting with a thermosetting or thermoplastic compound such as a compound, a melamine compound, a urea compound, an acrylic compound and a vinyl acetate compound. These may be used alone or in combination of two or more. When the novolac type phenol resin is used alone, it is necessary to impart thermosetting property by using a crosslinking agent such as hexamethylenetetramine.

Among the phenolic resins, the methylol group-containing novolak type, resol type, nitrogen-containing resol type and benzylic ether type phenolic resins are novolak type phenolic resins which use a crosslinking agent in view of the odor of the laminate and the ease of production. More advantageous, in particular, the benzylic ether type phenolic resin has thermal stability and color stability superior to those of other resins, and can suppress deterioration of the wet-molded article described later, particularly progress of curing. It is preferably used.

Since the laminated body according to the present invention considers an alternative material to a wood-based material, from the viewpoints of cost, lightness, strength and processability, (A) pulverized or disintegrated fiber mainly composed of waste paper. 50-90% by weight of base material and 50-10% by weight of (B) thermosetting resin, preferably 60-85% by weight of (A)
And (B) 40 to 15% by weight, and having a basis weight of 300 g / m ² or more, preferably 400 g / m ² or more, more preferably 500 g / m ² or more, from the viewpoint of preventing delamination. From the viewpoint of securing the nail-holding force and preventing warpage, the molded body is a laminated body formed by laminating and integrally combining the same kind or different kinds, or a laminated body formed by further adhering the laminated body in layers. Further, since the laminated body can be applied as a substitute material for plywood for a pachinko base plate, the density is 500 to 9
00 kg / m ³ , preferably 600 to 800 kg /
m ³ , bending strength of 200 kg / cm ² or more, preferably 2
00-700 kg / cm ² , more preferably 300-5
00 kg / cm ² and nail holding force of 15 kg / cm or more, preferably 20 kg / cm or more.

If the amount of the (A) fibrous base material is less than 50% by weight and the amount of the (B) thermosetting resin exceeds 50% by weight, workability is deteriorated and cost is increased. ) Is 9
If the content of (B) is more than 0% by weight and less than 10% by weight, the strength and nail-holding strength are so low that it cannot be put to practical use. Also, the basis weight is 30
If it is less than 0 g / m ² , delamination is likely to occur, which is inconvenient. Further, if the density is less than 500 kg / m ^3, it is difficult to secure the target strength and nail holding force, and conversely 900 kg / m ^3.
When it exceeds m ³ , it is not preferable because it is too heavy and the workability is deteriorated. If the bending strength is less than 200 kg / cm ^2, it cannot be put to practical use as a substitute material for wood-based materials. Further, if the nail-holding force is less than 15 kg / cm, it is not preferable for the pachinko machine board surface plate because the seismic resistance of the nail and the degree of ball popping are not sufficient.

The laminate according to the present invention is generally manufactured by a method applying the following papermaking method. First of all, a large amount of water and waste paper and, if necessary, organic matter and / or organic matter in the disintegrator beater (eg pulper, Henschel mixer)
Alternatively, after the inorganic fibers are added, a high speed stirring process is performed to obtain a slurry in which waste paper is crushed or disintegrated. Then, the slurry is transferred to a mixing tank with stirring blades, a thermosetting resin is added thereto and sufficiently mixed, and if necessary, various additives such as a fixing agent, a cross-linking agent, a curing accelerator, a filler (light weight). Aggregates and solid aggregates), flame retardants, plasticizers, insect repellents / bactericides, pigments, fragrances, etc. are added and further mixed to obtain a papermaking slurry.

Next, the slurry for papermaking obtained in the above step is formed into a wet-molded product having a desired thickness, for example, a sheet or a thin plate by a Fourdrinier type or cylindrical type papermaking machine (continuous type or batch type), filtration, Dehydrated by reduced pressure, squeezing, etc., and then dried by a drying device such as a drum dryer, a hot air aeration dryer, a dielectric heating dryer, a far infrared dryer, a vacuum dryer, etc. in an uncured state having a desired basis weight. A thermosetting molded body is obtained. If necessary, a cross-linking agent (for example, hexamethylenetetramine or a water-soluble resol-type phenol resin), a curing accelerator, etc. may be fixed to the wet molded body by, for example, spray impregnation. Further, in the production of such a thermosetting molded body, a fibrous base material mainly composed of waste paper pulverized or disaggregated by an appropriate pulverizer, a thermosetting resin and, if necessary, the various additives are uniformly mixed with a mixer. The mixture obtained as described above is shaped into a mat-like fleece of a desired basis weight by a shaping machine such as a fleece manufacturing machine, and the desired thickness (for example, while suppressing curing of the resin by a baking machine or a press). A dry method may be employed in which a thermosetting molded article in an uncured state is obtained by adjusting to a sheet shape, a thin plate shape, or a mat shape).

Next, the thermosetting molding obtained in the above step is
Depending on the desired properties (thickness, density, density difference composition, density gradient, etc.), the same kind or different kinds of layers are laminated, and this is heated and pressed by a thermocompression molding device such as a compression molding machine, a pultrusion molding machine, an extruder, etc. Are integrated and cured at the same time to be shaped into a laminate. In addition, the obtained laminated body is further provided with a plurality of bonding fixing means such as screws, nails and adhesives, preferably adhesives, especially curable adhesives (eg phenolic resin, urea resin, melamine resin, epoxy resin). , Urethane resin, etc.) to form a layered body which is adhered (partially or entirely) in layers and bonded and fixed.

The laminate according to the present invention thus obtained is
As described above, since it is a multi-layered structure having a strong interlayer bondability, which is formed by using a thermosetting molded body having a specific basis weight, it not only exhibits excellent nail-holding power, but also has a higher temperature and temperature than a single-layer structure. It has an advantage that it is possible to prevent warpage due to changes in humidity. Furthermore, by providing a high-density layer in the laminated structure, it is possible to further improve the characteristics of the laminated body (warp prevention, nail retention, strength). Specifically, for example, when a high-density surface layer is provided on the upper and lower surfaces of a low-density core layer, or when a thermosetting molded article of the same kind is laminated and molded, the compression speed is adjusted (if the compression speed is increased, the surface layer is relatively It is a laminate having a high density and, conversely, the core layer density can be relatively increased by decreasing the compression speed), and the surface layer portion and the core layer portion have different densities.

The laminate according to the present invention has plastic sheets or boards such as acrylic resin and vinyl chloride resin, melamine resin decorative paper, kraft paper, and aluminum kraft on its surface and / or core, if necessary. Paper, paper such as printed paper, aluminum thin plate, stainless steel thin plate, metal thin plate such as embossed metal thin plate, cork sheet, wood thin plate such as natural wood board, woven or non-woven fabric of inorganic fiber or organic fiber Etc. may be provided.

[0016]

The present invention will now be described with reference to examples, but the present invention is not limited to these examples. The density is JIS Z-2101 and the bending strength is JIS
K-6911 and nail retention strength were measured according to JIS Z-2101. The workability was evaluated based on the plywood for the pachinko base plate for comparison as a reference. When the workability was comparable, it was indicated by "○", and when it was inferior and could not be put to practical use, it was indicated by "X".

Example 1 120 liters of water and 700 g of used waste paper were put into a 200 liter pulper (rotation speed 3500 rpm) and stirred for 5 minutes to obtain a slurry in which the waste paper was crushed or disaggregated. Next, the entire amount of this slurry was transferred to a mixing tank with a stirring blade (rotation speed 600 rotations / minute), 300 g of benzylic ether type phenol resin powder was added, and the mixture was stirred and mixed for 10 minutes, after which a polyacrylamide-based fixing agent was added. The mixture was stirred and mixed to obtain a papermaking slurry. Next, the entire amount of this papermaking slurry was put into a square batch papermaking machine (papermaking net 150 mesh, 1000 × 1000 mm) and filtered,
Suction press dehydration was performed to obtain a sheet-like wet molded body. Then, the wet molded body was dried in an oven at 80 ° C. to obtain a thermosetting molded body having a basis weight of 950 g / m ² in an uncured state. Subsequently, the same operation as described above was repeated to produce 14 thermosetting moldings of the same kind. Then, 14 thermosetting moldings are stacked and placed in a metal frame having a height of 19 mm at a temperature of 1
It was heated and pressed at 80 ° C. and a pressure of 6 kg / cm ² for 35 minutes to produce a laminate having a thickness of 19 mm. The obtained laminate was examined for density, bending strength, nail-holding power and workability by the method described at the beginning. Table 1 shows the results. No delamination phenomenon of the laminate was observed at the time of measuring the bending strength and the nail-holding force.

Comparative Example 1 The same procedure as in Example 1 was repeated except that 140 g of waste newspaper and 60 g of benzylic ether type phenolic resin powder were used in Example 1, but the thermosetting property was 185 g / m ² basis weight. 70 molded bodies were produced. Next, height 19m
70 pieces of the thermosetting molded bodies are stacked and placed in a metal frame of m,
A laminate having a thickness of 19 mm was produced by heating and pressurizing at a temperature of 180 ° C. and a pressure of 6 kg / cm ² for 35 minutes. For the obtained laminate, the density, bending strength, nail retention force and workability were examined by the method described at the beginning, but when nails were driven into the laminate for nail retention measurement, delamination was observed at some parts. In addition, the test piece broke with delamination during bending strength measurement.

Comparative Example 2 The procedure of Example 1 was repeated except that the newspaper waste paper was changed to 360 g and the benzylic ether type phenolic resin powder was changed to 440 g, and the basis weight was 750 g / m ^2.
12 thermosetting moldings were produced. Then height 19
Twelve thermosetting moldings were stacked and placed in a mm metal frame, and heated and pressed at a temperature of 180 ° C. and a pressure of 6 kg / cm ² for 35 minutes to produce a laminated body having a thickness of 19 mm. Regarding the obtained laminate, the density, bending strength,
The nail retention and workability were examined. Table 1 shows the results. It should be noted that no delamination phenomenon of the laminate was observed when the bending strength and the nail-holding force were measured, but it was confirmed that the laminate was easily chipped during nailing and cutting.

Comparative Example 3 With respect to the plywood used for the pachinko base plate, the density, bending strength and nail holding force were examined by the methods described at the beginning. Table 1 shows the results.

Application Example After making a prototype pachinko machine similar to the actual machine using the laminated body obtained in Example 1, ball hammering evaluation was conducted for a long period of time. And, the warp of the pachinko machine was not recognized. From these results, it was confirmed that the laminate according to the present invention can be used as a substitute material for plywood for a pachinko base plate.

[0022]

[Table 1]

[0023]

EFFECTS OF THE INVENTION The laminate according to the present invention is a multi-layered structure composed of a waste paper-based thermosetting molding having a strong interlayer bonding property, so that it is low in cost, light in weight and excellent in nail holding power.
Moreover, it has an advantage that it has strength and workability comparable to that of plywood, and in addition, it has an advantage that warpage due to changes in temperature and humidity can be prevented. The laminate according to the present invention having such excellent properties has practical utility as a substitute material for wood-based materials, especially plywood for pachinko base plate, but for other forms, packing, pallets, furniture, etc. It can also be applied to a wide range of applications such as plates. Further, since it can be practically used as a substitute material for wood-based materials, it can greatly contribute to the protection of the natural environment by promoting the recycling of waste paper and saving wood resources.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Isao Kai 26 Azai Organic Materials Industry Co., Ltd.

Claims (2)

[Claims] 1. A composition comprising (A) 90 to 50% by weight of a pulverized or disintegrated fibrous base material mainly composed of waste paper and (B) 10 to 50% by weight of a thermosetting resin and having a basis weight of 300 g /
A laminated body formed by integrally laminating thermosetting moldings of the same or different type having a size of m ² or more, or a laminated body formed by joining the laminated bodies in a layered manner, and having a density of 500 to 900 kg / m ³ .
A laminate having a bending strength of 200 kg / cm ² or more and a nail pull-out resistance value of 15 kg / cm or more. 2. A pachinko machine characterized by using the laminate according to claim 1 as a pachinko machine base plate.