JP3140441B1 - Board manufacturing method using waste paper and board - Google Patents

Abstract

An object of the present invention is to reduce the time of a process that uses only stirring when processing waste paper into a board. SOLUTION: Used paper P2 is separated and cut into rough sections P3 and booth sections P4. The booth sections P4 are mixed with a binder 4 and stirred to form a mud. The muddy material and the rough section P3 are mixed to form a molding material, and a board B is obtained through molding 6, dehydration and constant thickness 8, drying 14, and surface treatment 17. By separating stirring and mixing, a large amount of molding material can be obtained in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a board using used paper collected from newspapers, magazines, and the like, and a board obtained by the manufacturing method.

[0002]

2. Description of the Related Art Urethane sponge is conventionally used as a sound absorbing material for a soundproof cover (package) by each machine maker. Further, when the urethane sponge is ignited by heating, considerable toxic gas may be generated.

On the other hand, there is a proposal to reuse used paper. Regarding a method of manufacturing a board using used paper, for example, Japanese Patent Application Laid-Open Nos. 8-208803 and 8-217.
524 and JP-A-8-302598.

[0004]

The above prior art is effective as a method for manufacturing a board using waste paper.

The present invention is a further development of the above-mentioned conventional technology.

[0006] The present invention introduces a new method into the method of cutting used paper and the method of stirring and mixing the used paper and the binder, so that inexpensive soundproofing materials and building materials can be obtained in a simple process. It is an object of the present invention to provide a method for manufacturing a board and a board.

[0007]

According to a first aspect of the present invention, there is provided a process of manufacturing a rough section of used paper by using a shredder and a step of manufacturing a small section of the used paper by using a shredder. A mixing step of adding a woody material binder to the booth section and stirring the mixture with a stirring unit, a mixing step of mixing the agitated material and the rough section stirred in the stirring step with a mixing unit, and a mixing step. A molding process in which the mixture obtained is formed into a plate shape by using a molding jig to obtain an elementary molded product, and a plate-shaped material obtained in the molding process is depressurized by pressurizing with a pressing means to dehydrate to a constant thickness. A board using waste paper, comprising: a thickening step, a step of drying the plate-like object after the dehydration and constant-thickness step by a drying unit, and a step of performing a surface treatment of the dried plate-like object. It is a manufacturing method.

[0008] A second invention according to the present application is a step of manufacturing a rough section obtained by cutting waste paper using a shredder, a step of manufacturing a booth section by cutting a used paper into small pieces using a shredder, A stirring step of adding a binder for woody material and stirring with a stirring means, a mixing step of mixing the agitated material and the rough pieces stirred in the stirring step with a mixing means, and a molding and curing process of the mixture obtained in the mixing step. Molding process to obtain a raw molded product by forming into a plate shape using a tool, dehydration and constant thickness process to pressurize and dehydrate the plate-like material obtained in the molding process to a constant thickness, A step of drying the plate-like material after the thickening step by a drying means, and a step of subjecting the dried plate-like material to a surface treatment. It is a board.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow sheet showing a board manufacturing method using waste paper.

The used paper bundle P1 is obtained by collecting used newspapers as resources. Magazines may be used as long as they are almost the same quality as newspapers.

The recovered waste paper bundle P1 is untied and recovered waste paper P
It becomes 2. The used paper P2 is cut by being hung on the shredders 1 and 2. The shredder 1 is for roughly cutting the waste paper P2, and the size of the rough section P3 after the rough cutting is, for example, 4 mm in the case of newspaper paper and 545 mm in the longitudinal direction.
Becomes The shredder 2 cuts the used paper P2 into small pieces, and the size of the piece P4 after the small pieces is 4 mm.
X 25 mm in length.

The booth section P4 and the binder 4 separately prepared are charged into a stirring means, for example, a stirring tank 3, and stirred. The stirring tank 3 rotates a rigid stirring member in the tank.

In this case, the binder 4 is obtained by converting the woodworking adhesive to 20
It has been diluted twice. The woodworking adhesive is a vinyl acetate resin emulsion composed of 55% synthetic resin and 45% vinyl acetate resin / water. Here, the ratio of the binder 4 and the booth section P4 is such that the booth section P4 is 3 kg and the binder 4 is 1 k
g.

To this, 20 liters of water is added, and
Stir for minutes. This agitated material is a material in which the waste paper is disintegrated in a short state with a short fiber length and the binder 4 is uniformly mixed, and the agitated material has a function as a binder. This gives a muddy agitated product.

The agitated material and the rough section P3 are put into, for example, a mixing tank 5 as mixing means. Here, the mixing tank 5 rotates, for example, a screw blade so that the contents are lifted and dropped. The input ratio is 4 kg of the agitated material with respect to 5 kg of the rough section P3. When the rough section P3 and the agitated material are mixed in the mixing tank 5, a mixture is formed. Here, the operation time of the mixing tank 5 is 30 seconds.

Next, a forming, dehydrating, constant thickness, and drying process are performed. In the molding, the mixture obtained as described above is filled in a molding jig 6. The molding jig 6 of this example is for obtaining a square board, and has a complementary shape in consideration of the expansion and contraction allowance for the product board. While the molding jig 6 is being filled, the mixture is pressurized by placing a lid (not shown) on the molding jig 6. This pressing force is 15 kg. The lid is parallel to the flat bottom of the molding jig 6 and has a flat surface facing the bottom.

Dewatering is performed by compressing the green molded product 7 taken out of the molding jig 6 with a pressing machine 8 so as to have a constant thickness. That is, the thickness is adjusted to a thickness corresponding to the product thickness (dehydration constant thickness step). Here, the pressing machine 8 is a lower mold 1
The upper die 9 is movably fitted in the up and down direction on the guide post 12 erected at 1 and presses the upper die 9 and the lower die 11 close to each other by a press machine (not shown). The raw molded product 7 placed on the lower die 11 is compressed and dehydrated when the upper die 9 and the lower die 11 approach each other in a parallel state to have a constant thickness to form a constant thickness molded product 13.

Here, the pressing force was set to a constant thickness by applying a force of 50 kg with the weight of the raw molded article 7 being 3 kg. In this case, the size of the formed plate is 450 mm square.

Next, the molded article 13 having a constant thickness is dried by a drier 14 and the one having a water content of 50% by weight is dried to almost 0% (drying step). Here, the dryer 14 has a shelf 15 such as a horizontal perforated plate or a wire mesh in the housing, places the molded article 13 having a constant thickness on the shelf 15, and blows warm air into the housing by a hot air device (not shown). It circulates.

The surface of the dried drying board 16 is subjected to a surface treatment step 17 so as to satisfy the specifications on the demand side. The weight of one finished dry board 16 is 700
g.

In the surface treatment step 17, for example, when used as a sound absorbing material, as shown in FIG. 2, one surface of the drying board 16 has a water-based paint finish 17a, and the other surface has a single-use waste paper 17b finish.

When used as a sound insulating material, as shown in FIG. 3, one surface of the drying board 16 has a general paint thin coating finish 16c, and the other surface has a used paper double-clad finish 17d.

It should be noted that the drying board 1 can be used without surface treatment.
6 itself has high sound absorption and sound insulation performance.

When used as a heat-resistant wall material, as shown in FIG. 4, one surface of the drying board 16 has a heat-resistant coating finish 16e,
The other side is used paper double upholstery finish 16f.

If there is data on performance related to sound absorption, sound insulation, heat resistance, and strength, please provide it.

[0027]

According to the present invention, the used paper is cut into rough drawn pieces and small pieces, and the small pieces are stirred with the binder, so that the small pieces are disintegrated into relatively short fibers. Since the binder is mixed with the disintegrated fibrous material, a mixture obtained by adding the binder to the booth section and stirring the mixture has a large binding force. Then, since the agitated material and the rough drawing pieces are mixed, the rough pieces are joined by the agitated material without being disaggregated. For boards such as boards with a large volume of material, separating the pieces into rough sections and booth sections in order to increase the volume reduces the working time and at the same time achieves the required board thickness and ensures strength. It is particularly effective.

Even if such a mixture is filled in a molding jig and separated from the jig, the mixture has a shape-retaining property, and preparation for the dehydration and thickening step work can be facilitated.

According to the board of the present invention, the sound absorbing and sound insulating performance can be made nonflammable by subjecting the surface to heat treatment. Further, the board has a paper sliver and therefore has a hygroscopic property, and when used as a building material, has an indoor humidity control action.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a method for manufacturing a board using waste paper according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view perpendicular to the plate surface of the sound absorbing board.

FIG. 3 is a cross-sectional view perpendicular to the plate surface of the sound insulating board.

FIG. 4 is a cross-sectional view perpendicular to the surface of the heat-resistant board.

[Explanation of symbols]

P1: Used paper bundle P2: Used paper P3: Rough section P4: Booth section 1 ... Shredder 2 ... Shredder 3 ... Stirrer tank 4 ... Binder 5 ... Mixing tank 6 ... Molding jig 7 ... Elementary molded product 8 ... Pressing machine 9 ... Top Mold 11 ... Lower mold 12 ... Guide post 13 ... Molded product with constant thickness 14 ... Dryer 15 ... Shelf 16 ... Drying board 16c ... Thin coating finish 16e ... Heat resistant coating finish 16f ... Used paper double tension finish 17 ... Surface treatment process 17a ... Water-based paint finish 17b…
Recovered paper single tension 17d ... Recovered paper double tension

Claims (2)

(57) [Claims] 1. A step of manufacturing a rough section of waste paper using a shredder, a step of manufacturing a small piece of waste paper by using a shredder, and adding a wood material binder to the small section. A mixing step of mixing the stirrer and the rough pieces stirred in the stirring step with a mixing means, and mixing the mixture obtained in the mixing step into a plate using a molding jig. Forming process to obtain an elementary molded product by molding, plate-like material obtained in the molding process is depressurized by pressurizing means and dewatered to constant thickness. A method for manufacturing a board using waste paper, comprising: a step of drying an object by a drying means; and a step of performing a surface treatment on the dried plate-like object. 2. A step of manufacturing a rough section of waste paper using a shredder, a step of manufacturing a small section of the waste paper by using a shredder, and adding a wood material binder to the small section. A mixing step of mixing the stirrer and the rough pieces stirred in the stirring step with a mixing means, and mixing the mixture obtained in the mixing step into a plate using a molding jig. Forming process to obtain an elementary molded product by molding, plate-like material obtained in the molding process is depressurized by pressurizing means and dewatered to constant thickness. A board obtained by a board manufacturing method using waste paper, comprising: a step of drying an object by a drying means; and a step of performing a surface treatment of the dried plate-like object.