JP2720366B2 - Method for manufacturing single-layer fiberboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fibers for papermaking waste and the like.
For efficient production of single-layer fiberboard from waste materials
You. [0002] 2. Description of the Related Art In a paperboard manufacturing plant, mainly used as a paperboard raw material.
Use a mixture of kraft pulp and waste paper,
Various papermaking wastes are generated in the paper manufacturing process. For example,
Large amounts of knots (cooked) residue are produced during raft pulp production
On the other hand, when disintegrating waste paper or pulp,
After blending waste paper that has been generated and disintegrated with appropriate stock
Also various screen debris, cleaner debris and terminal sludge
Occurs. [0003] In these papermaking wastes, some
Refuse and cleaner refuse are used as raw materials for lower grade paper, and
The ludge is recycled to the paper mill and
Is used as fuel for boilers, but fiber waste
Most of the waste is not economically and effectively treated,
In addition, since it occurs in a very large amount,
That is the current situation. [0004] In particular, when the used paperboard is disintegrated,
Papermaking waste such as pulp pulverized waste is attached to paper containers and paper bags.
Wearing gum tape, vinyl tape, vinyl acetate
Including adhesive, plastic film, spelling needle, earth and sand
Therefore, there is no proper disposal method other than landfill disposal.
Minute method is expensive and accused of causing pollution
Have been. [0005] Fiber wastes include government agencies and
Do not take unnecessary documents outside in large companies, etc.
Papers finely chopped with shredders also apply,
This has increased dramatically with the recent promotion of OA. Sh
Paper cut with a redder has a width of several mm and a length of several tens.
mm and the paper contains sizing agent and melamine resin.
Because it is soaked and has a vinyl coating,
At present, incineration or landfill methods are used
Only. [0006] [Problems to be Solved by the Invention] Treatment of fibrous waste
As a law, for example, Japanese Patent Publication No. 56-11581 exists
However, according to the method described in this publication, the main component of this waste is
Fiber material (pulp material, etc.)
No process. This fiber material contains large pieces of paper,
Since a large number of resin pieces are mixed,
Unless crushed to a practical fiber board obtained mechanical
Providing strength is difficult in practice. [0007] As in the above method, preforming and hot working
When a core is produced from a sol-like material simply by applying pressure,
The production time was so long that it was very uneconomical
I will. Therefore, this method uses the method disclosed in the above publication.
Even if it can be performed in a test plant like the example,
Unresolved problems remain in large industrial plants
I have. The present invention discharges a large amount from a paper mill or the like.
Ameliorate the above mentioned problems with respect to fibrous waste
It was proposed for Therefore, the object of the present invention is to
Single-layer fiber useful for rapid and large-scale treatment of fibrous waste
An object of the present invention is to provide a method for efficiently manufacturing a board. [0009] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the production method according to the present invention, first, fibrous waste
Removes metal pieces, earth and sand, etc. and turns the waste into small pieces
Disintegrate. Mixing binder, waterproofing agent, etc. with the obtained aqueous waste liquid
And then solidified by primary molding under pressure
After water evaporation by infrared device
Into a plate shape under heating and pressure. In the method of the present invention, a binder,
When mixing a liquid agent or the like, the concentration of the aqueous waste liquid is about 2 to 4
It is preferable to increase the fluidity by setting the weight%. In primary molding
When the aqueous waste liquid is solidified, the water content of the obtained primary molded plate becomes
It drops to about half. Since the moisture content is still high,
It is usually heated and dried effectively by an infrared device. This infrared device is generally a dark infrared device
However, in some cases, a far-infrared device can be used.
is there. After passing through the infrared device, the moisture content of the primary molded plate becomes
It drops to about 22-25%. Next, secondary heating and pressurization
When molded, the resulting fiberboard has a moisture content of less than about 10%.
You. [0012] The raw material used in the method of the present invention is fibrous waste.
The paper waste can be exemplified as the fibrous waste.
Of paperboard waste from paperboard mills
Waste is preferred. This type of paper waste includes pallets.
Par scum, Jansson screen scum, flat screen
Lump, centricleaner lump, terminal sludge, Japanese paper
Use terminal sludge alone or as a mixture of two or more.
Knot debris and sludge for quality control of waste fiberboard
Etc. may be added. [0013] Pulper residue, various screen residue
Cleaner residue is a fibrous solid separated from waste paper and pulp.
In addition to shaped products, gum tape, vinyl tape, vinyl acetate
Adhesives, plastic films, spelling needles, earth and sand, etc.
These are used in the manufacture of fiberboard, except for some of them.
Can be [0014] The terminal sludge of Japanese paper is manufactured by itself.
The fiberboard is beautiful,
After mixing, add a known polymer flocculant around 1% of the absolute dry weight.
You can get it. In addition, as fiber waste used,
Finely chopped paper for used faxes, used fax
Add all or part of paper, copy paper, newspaper inserts, etc.
Is also good. [0015] According to the method of the present invention, the aqueous waste liquid is solidified by primary molding.
Even if the water content of the primary molded plate
High moisture content, depending on the infrared device,
Heat to 0 ° C and quickly dry the primary formed plate from inside the plate
You. The primary molded plate that has passed through the infrared device is
Rate is reduced to about 22-25%, and the formed plate is relatively thick
This also allows for heating and drying in the secondary molding. In the method of the present invention, fibrous waste such as
Various types of pulper waste generated when disintegrating pulp and waste paper
Effectively process screen debris and cleaner debris
And fine fiber cleaner residue and terminal sludge
It is possible to mix as. In the method of the present invention,
Gum tape, vinyl tape, vinyl acetate for fibrous waste
May contain adhesives, plastic films, etc.
No. [0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the method of the present invention will be described with reference to FIG.
explain. Pulper rich in solids among papermaking waste.
1 、 Various screen residue and cleaner residue 1 are fiberboard
First to improve the quality of water and the flowability of aqueous wastewater
Put into the tank 2 to form small pieces (for example, about 5 mm or less in length)
Disintegrate. In the crushing tank 2, the contents are stirred.
, One or two wet crushers 3 (for example, through trade name
Pump, manufactured by Komatsu Zenoa). Crushing
From the bottom 4 of the tank 2, a metal such as a non-crushable spelling needle
Remove chips, earth and sand. The crushed contents are generally transferred by a transfer pump.
(Not shown) and pass through cyclone 5, where it remains
The remaining metal chips, earth and sand, etc. are completely removed.
Screen or roller dehydrator as required from cron (Figure
(Not shown) into the mixing tank 6. No need to crush
Chip-shaped knot residue, various sludge, etc. are desired
May be directly charged into the mixing tank 6 depending on the conditions. In the mixing tank 6, water is measured by the concentration measuring device 7.
The concentration of the aqueous waste liquid is set to about 2 to 4% by weight,
In addition to increasing the fluidity, the binder and water-resistant agent are removed from the chemical tank 8.
Add the ingredients and stir vigorously. As an example, the binder is thermosetting
Phenolic resin (for example, SK agent (trade name), Dainippon
Niki Chemical Industry Co., Ltd.)
Rejon (for example, WR + N liquid, Dainippon Ink and Chemicals, Inc.)
Industrial company). The addition amount of the thermosetting phenolic resin is
About 2 to 8 parts by weight based on 100 parts by weight of the aqueous waste liquid
In general, the greater the amount added, the higher the mechanical strength of the fiberboard
Higher, but beyond a certain amount, the mechanical strength increases
Unless it is less than the specified amount, it cannot be used as a hard fiberboard
Become. On the other hand, the addition amount of the water-proofing agent is the absolute dry amount
It is about 1 to 3 parts by weight with respect to 0 parts by weight.
This is effective in maintaining a predetermined water resistance of the fiberboard.
In this case, in order to further fix the binder and the waterproofing agent,
The pH value of the aqueous waste liquid is adjusted to 4.5 to 5.
0, and paint from the chemical tank 8 as required.
Etc. may be added. The aqueous waste liquid thus obtained is obtained by using water as a dispersion medium.
Sol-like substance, for example, a centrifugal pump (not shown).
) To the raw material tank 9. Stirring in the raw material tank 9
And then the aqueous waste is removed from the
(Not shown) to the primary molding machine 10
You. The primary molding machine 10 is configured as shown in FIG.
It has a simple structure. In the primary molding machine 10, pressurization of the upper part
The board 11 has a number of through grooves 13 in a front wall 12,
A wire mesh 14 is stretched on the surface of the wall. The pressure plate 11 is a vacuum port.
Pump (not shown) to squeeze water in the direction of arrow V.
Also, a large number of through grooves 17 are provided in the front wall 16 of the receiving board 15.
A wire mesh 18 is stretched on the surface of the front wall, and
Form 1 having an inner diameter substantially equal to the outer diameter of the pressure plate 11 on the plate 15
9 and the filtrate falling from the through groove 17 is directed in the direction of arrow F.
Discharge in the direction. The aqueous waste liquid is supplied to the input port 20 as shown by the arrow L.
From inside the mold 19. The aqueous waste liquid 21 in the mold 19 is 2
At the first stage, the pressurizing plate 11 is moved
In the direction, for example, a surface pressure of about 5 to 10 kg / cm^Twoso
Dehydrate. Then, in the second stage, a flat pressure plate (shown in the figure)
No) and the mold 19 is removed to obtain a surface pressure of about 10 to 10.
30Kg / cm^TwoDehydration at high pressure to form into a flat plate.
As a result, the moisture content of the obtained primary molded plate is preferably about 50% or less.
About 40-45%, and its thickness is about 4%
0 to 45%. At this time, the water content of the primary molded plate is about 50
%, The heating furnace will be lengthened in the next moisture evaporation step.
And the amount of electricity used increases extremely, which is uneconomical
It is. In addition, instead of the illustrated primary molding machine 10, a well-known
For roller type belt press (for example, manufactured by Maruishi Seisakusho)
Production of primary molded plates continuously at high speed
This method can reduce the final thickness of the fiberboard
This is only possible when it is less than 6 mm. The filtrate discharged by the primary molding machine 10
Is sent to the filtrate tank 22 (FIG. 1), and from the filtrate tank
After returning to the mixing tank 6 via a transfer pump (not shown),
Release part as wastewater. For use in the primary molding machine 10
The washing water is sent to the filtration tank 23,
And returned to the crushing tank 2 via a transfer pump (not shown). Since the primary molded plate still has a high water content,
It is necessary to carry out a minute evaporation process, and for this
Let it pass. This moisture evaporation method uses a dark infrared device.
Dark infrared devices (eg Infrastein, Japan)
And dried by heating to 200 to 250 ° C.
After passing through the heating furnace 24, the moisture content of the primary molded plate is about 22
２５25%. [0027] The primary molded plate after the water evaporation treatment has an additional 2
The secondary molding is performed by the secondary molding machine 25 to a specified thickness.
As the secondary molding machine 25, for example, a known hot multi-stage press is used.
The temperature of the hot plate of the press is 170-180 ° C before
After, and the surface pressure is about 20-30Kg / cm^TwoAdjust to
By the secondary molding, the water content of the fiberboard is reduced to 10% or less.
You. The obtained single-layer fiberboard 28 is sequentially placed in the slitter 2
6 cut the edge and load it on the auto stocker 27
And store it in the warehouse. Store in the warehouse for 10-15 days,
It may be shipped after adjusting the humidity appropriately. As shown in FIG. 3, the single-layer fiberboard 28
For gum tape, vinyl tape, vinyl acetate
Nylon adhesive, plastic film, etc.
Although they remain at 20 to 30% by weight, they are
Mostly melted in the heat / pressurization process to form a fused material 29
This helps to increase the mechanical strength of the fiberboard 28. The fiber board 28 is made of various fibrous solids.
Contains 30 as the main component and is substantially similar to kraft paper
Excellent heat insulation and sound insulation properties, and
Due to the presence of the liquid agent, it is also excellent in water resistance and moisture resistance. Change
The fiberboard 28 is boiled in hot water of 100 ° C. for 2 hours.
Does not change the shape, it can be cut with a saw, and nails can be stored.
It has excellent holding power, and it is a cosmetic paint even when surface painting is performed.
It stretches well and does not peel off. The fiberboard 28 is generally a single layer having a thickness of 2
Up to 15 mm, substantially according to JIS-A59
07, which is equivalent to hard fiberboard specified in
Bending strength is further enhanced by special treatment with resin etc.
It is also possible to make it larger. Also, withstand pressure
When used for pallets of elephant,
Since the degree does not need to be so large,
It can be formed up to a lower thickness. Next, a more specific embodiment of the present invention will be described.
I do. Example 1 To test the production of 2.5 mm thick fiberboard,
5 kg of pulper residue generated in the paper manufacturing process (absolute dry amount, below
Same) and 5 kg of Jansson screen dregs are used. This
They are put into a crushing tank containing 340 liters of water,
When crushed for about 10 minutes with (trade name Sluzer Pump)
It becomes a small piece with a length of about 5 mm. This aqueous waste solution is added to the mixing tank.
And remove thermosetting phenolic resin (SK agent)
Add 5% by dry weight and stir for 10 minutes.
5 minutes after adding the emulsion (trade name WR + N solution)
After stirring for 3 hours, add 3% by weight of absolute sodium sulfate
And stir. Primary molding of 68 liters of the obtained aqueous waste liquid
Pressing press formwork (975 x 975 x height)
200 mm) and a surface pressure of 5 kg / cm 2 for about 25 seconds
Surface pressure 15kg / cm^TwoPress for about 25 seconds.
The obtained primary molded plate had a thickness of 3.9 mm, a weight of 3.7 kg, and contained
The water content is 45%. This primary molded plate is a dark infrared device (product
(Infrastein), the moisture of 1.1
The amount of electricity used to evaporate liters is 1 KW / min
You. Next, secondary molding is performed, and hot pressing of the secondary molding machine is performed.
Indicates that the heat source is steam, the hot plate temperature is 180 ° C, and the surface pressure
20Kg / cm^TwoFor about 2 minutes. Final products include
The water content is around 8%, and its dimensions are 975 x 975 x
The thickness is 2.5 ± 0.5 mm. The physical properties of the fiberboard are measured according to JIS-A590.
It is as follows when measured according to 5-A5907. [0036] [Table 1]Note) The average value of No. 1 to No. 3 up to the moisture content of the test items. Hard fiber specified in JIS-A5907
In the plate S200, the criterion is a specific gravity of 0.8 or more and a water content of 5-1.
3%, bending strength 200Kg / cm^TwoAbove, water absorption 30%
It is required that the fiberboard of this example
Has passed the criteria. Embodiment 2 To produce 100,000 monthly 3mm-thick fiberboard
, 70 tons of pulper cake per month (absolute dry weight, same hereafter)
Ji), 75 tons of knot residue, 240 tons of terminal sludge,
Use 18 tons of conditioning sludge. The only pulper residue is
1m beforehand in the crushing tank^ThreeCrushed at a rate of / min
You. 760 kg / hour of these raw materials is converted to an actual volume of 2
2m^ThreeInto the mixing tank, and the thermosetting phenol from the chemical tank.
Resin (trade name SK agent) (20 tons / month)
Paraffin emulsion (product name WR + N solution)
10 tons), and then add sodium sulfate
The aqueous effluent is adjusted to pH 4.5-5.0. The water content of the obtained aqueous waste liquid is 96.5%.
You. This aqueous waste liquid has an actual volume of 22 mm.^ThreeRaw material tank
Send and stir, and weigh 113 kg per sheet in a measuring tank.
Weigh. As a primary molding machine, a hydraulic pressurization type die is used.
Bull wire and high pressure press (1st stage output 120 tons,
(2nd stage output 350 tons) (Yamamoto Iron Works)
The shape of the frame is 920 horizontal x 1830 vertical x 68 mm high.
The first stage surface pressure of 7 kg / cm^TwoAt the water content of aqueous wastewater
Is 60%, and the surface pressure of the second stage is 20 kg / cm^TwoIncluding
The water content drops to 45%. The obtained primary molded plate weighs 10 kg / sheet, and has a thickness of 10 kg.
4.4mm and the production efficiency is 4-10m / min.
You. This primary molded plate is a 50KW dark-infrared ray device (product
Moisture evaporation in a heating furnace using
The furnace uses 260 KW / h of electricity, and the processing capacity
190 sheets / hour. By this heating furnace, primary molded plate
Is 1.5 liters / sheet and its thickness is
4.0 mm. The output of the secondary molding machine is 350 tons.
Hot multi-stage press with 10 stages (Yamamoto Iron Works
Surface pressure of 20 kg / cm^Two、 Heat plate temperature 170 ℃
When the secondary molding is performed at a cycle of 20 times / hour, 930 horizontal × vertical
The fiberboard is 1840 x 3 mm thick. Then with a slitter
Trim the ears at a rate of 8 seconds / sheet, 910 horizontal x 182 vertical
A fiberboard of 0 × thickness 3 mm is obtained. This fiberboard is loaded
Load on several 420 auto stockers and store in warehouse
You. The obtained fiberboard is compliant with JIS-A5907.
All pass the same. [0045] According to the method of the present invention, the aqueous waste liquid is removed by the primary molding.
The moisture content of the primary molded plate obtained by solidification was reduced to about half.
After that, heat and dry effectively with an infrared device.
This infrared device is generally used in terms of production efficiency and equipment area.
It is better than a steam heat source. Through this infrared device
If the primary molding plate is relatively thick, the moisture content is low
Heating and drying in the secondary molding. The single-layer fiberboard obtained by the method of the present invention
Interior materials, building materials, pallets, highway noise barriers, construction
It can be used for tools and furniture. Japanese Standards (JIS) A
Has quality equivalent to hard fiberboard specified in 5907
It is possible and highly practical. The present invention
Single-layer fiberboard manufactured by the conventional method is rather landfilled or incinerated.
Use of fibrous waste, which requires disposal costs, as a raw material
Very cheap. When the method of the present invention is performed, it cannot be reused.
Quickly and easily recycle fibrous waste, which is considerably uneconomical
Can be processed in large quantities, resulting in resource saving effects and pollution
Not only contribute to the prevention of production, but also achieve sufficient production efficiency.
The use stage has been reached. By the method of the present invention, many papermaking
Effective treatment of large amounts of fibrous waste discarded by companies
Can landfill or dump them at sea
To avoid serious soil and seawater pollution
In addition, the cost of dumping has risen due to the reduction of landfill sites.
Can be qualitatively stopped. In the method of the present invention, the cleaner
By being able to use and process terminal sludge,
Waste recycling at a large manufacturing plant
And plan a closed circuit plant with almost no effluent
It is possible. This makes pollution regulations very strict.
Even in a difficult current situation, the amount of waste liquid discharge should be as close to zero as possible
Manufacturing plants like waste fiberboard
It can be built in Japan.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow sheet illustrating a manufacturing process of a single-layer fiberboard according to the method of the present invention. FIG. 2 is a schematic sectional view showing a main part of a primary molding machine used in the method of the present invention. FIG. 3 is a perspective view of a single-layer fiberboard manufactured according to the present invention. [Description of Signs] 2 Crushing tank 3 Crusher 6 Mixing tank 8 Chemical tank 9 Raw material tank 10 Primary molding machine 24 Heating furnace 25 Secondary molding machine 28 Single-layer fiberboard

Claims (1)

(57) [Claims] The waste was crushed into small pieces to remove the metal pieces and sediment from fibrous waste fiber that is disintegrated into small pieces
Binders for aqueous wastewater containing solids and small pieces of plastic such as gum tape, vinyl tape, adhesives, films, etc.
From a mixture of such water-agent, to be solidified by primary molding under pressure, after performing water evaporation process by infrared devices, such as substantially uniformly drying the plate in External further the primary molded plate A method for producing a single-layer fiberboard, comprising forming a hard plate by secondary forming under heat and pressure. 2. 2. The method according to claim 1, wherein when the aqueous waste liquid is mixed with a binder, a waterproofing agent, etc., the concentration of the aqueous waste liquid is set to about 2 to 4% by weight to enhance the fluidity.