JP2023028363A - Manufacturing method for adhesive for plywood and manufacturing method and manufacturing device for filler in the adhesive - Google Patents

Abstract

To provide a method for manufacturing a filler to be used as a material for an adhesive for plywood, from woody biomass combustion ash without disposing wastefully the entire amount of the combustion ash.SOLUTION: A manufacturing method for a filler for an adhesive for plywood comprises the steps of: slurrying woody biomass combustion ash (M) discharged from a woody biomass boiler power plant (P) with water supplied during conveyance through a conveying pipe (30) installed limitedly within a required length from a storage supply device (15) to a dryer (45); wet-pulverizing the combustion ash slurry at a concentration of less than 40 mass% until an average particle size becomes 4 to 50 μm, a maximum particle size becomes 100 μm or less, and a minimum particle size becomes 0.3 μm or more; and then, heat-drying the wet-pulverized combustion ash by the dryer (45) using steam supplied from the boiler power plant (P) as a heating source, so as to obtain a solid material to be used as the filler for the adhesive for plywood.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for manufacturing a filler that is a material for an adhesive for plywood, and an adhesive for plywood containing the filler thus manufactured.

Bark, stripped cores, and various types of wood waste generated at plywood manufacturing plants can be turned into woody biomass fuel that can contribute to the reduction of carbon dioxide (CO2) emissions from the perspective of carbon neutrality. This will contribute to the spread of steam turbine-type woody biomass boiler power plants that use this.

According to this, the heat (steam) and power required for plywood production can be covered by the energy supplied from the boiler power plant, but on the other hand, the more plywood is mass-produced, the more the boiler burns. As ash is generated, more and more plywood adhesives are needed in the assembly line process.

The above-mentioned woody biomass boiler combustion ash (hereinafter simply referred to as "woody biomass combustion ash") does not include construction waste materials, so if it is effectively used, it is not considered as industrial waste. Due to the cost of processing, transportation, and manufacturing, it is not being used effectively, and plywood manufacturers and power generation companies are still disposing of it as industrial waste for a fee. there is

In this regard, a single woody biomass combustion ash that does not contain municipal waste, construction waste, or other waste can be used as a fertilizer, a soil conditioner, an abrasive, an additive for various plastics, a heat insulating material or a fireproof material as a building material. Such use is described in Patent Documents 1 to 4, but the woody biomass combustion ash generated from the boiler power plant of the plywood manufacturing plant is used as a filler that becomes a material for adhesives for plywood, and the plywood is used. Recycling for manufacturing is not disclosed. If such a use can be developed, it is thought that transportation costs and manufacturing costs for the combustion ash will become unnecessary.

Japanese Patent No. 6391603 JP 2016-166115 A JP-A-2009-35641 JP 2018-58717 A

Problem to be solved by the invention and means for solving the problem

The present invention has been devised in response to the current demands as described above, in particular, so that the woody biomass combustion ash generated from a woody biomass boiler power plant can be effectively recycled in the production of plywood. As a method for producing a filler in an adhesive for plywood, in claim 1, woody biomass combustion ash discharged from a woody biomass boiler power plant is conveyed along a conveying pipeline that is piped from the storage supply device to the dryer. Slurry with water supply at, and the slurried combustion ash slurry at a concentration of less than 40% by mass,

Wet grinding until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,

The pulverized combustion ash slurry is heated and dried by a dryer using steam supplied from the boiler power plant as a heating source,

It is characterized by obtaining a solid matter that becomes a filler for adhesives for plywood.

A second aspect of the present invention is characterized in that the moisture content of the solid matter that becomes the filler of the adhesive for plywood is set to 10% or less.

Further, in claim 3, a woody biomass boiler power plant that supplies thermoelectric energy to a plywood production line as a manufacturing device for a filler in an adhesive for plywood,

a conveying line running a required length starting from a storage supply device for pre-hydrated woody biomass combustion ash in the boiler power plant and ending with a dryer;

While the woody biomass combustion ash is being conveyed along the conveyance pipeline, it is slurried by supplying washing water generated from the plywood sticking process of the plywood production line, and the slurried combustion ash slurry is less than 40% by mass. In order to wet-mill at a concentration,

a wet pulverizing device interposed and installed in the middle of the conveying pipeline;

A dryer also installed at the end point of the conveying pipeline to heat and dry the combustion ash slurry after pulverization by the pulverizing device using the steam supplied from the boiler power plant as a heating source,

The combustion ash slurry is repeatedly pulverized by the pulverizer until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,

The pulverized combustion ash slurry is heat-dried by the above-mentioned dryer to obtain a solid material that will be used as a filler for an adhesive for plywood.

Further, in claim 4, the adhesive for plywood includes an aqueous solution of phenolic resin as the main agent thereof, and an average particle size obtained by the production method according to claim 2 and having an average particle size of 4 to 50 μm and a maximum particle size of 100 μm or less. and a solid filler having a minimum particle size of 0.3 μm or more and a moisture content of 10% or less.

In claim 5, the content of the filler is 20 to 30 parts by weight with respect to 100 parts by weight of the phenolic resin.

According to the above configuration of claim 1, the entire amount of woody biomass combustion ash generated from a woody biomass boiler power plant that is attached to a plywood manufacturing plant, so to speak, is burned without wasting it. It is possible to mass-produce a filler that is effective as a material for adhesives for plywood from ash, and by using this, procurement costs and maintenance costs for calcium carbonate, which has been generally used as a filler, can be reduced. There is an effect that can be reduced.

Moreover, the filler for the adhesive for plywood is obtained by wet pulverizing the combustion ash slurry, which is a slurry of woody biomass combustion ash, at a concentration (solid content concentration) of less than 40% by mass, and then heating and drying to obtain the average particle Since it is solidified as a solid substance (powder) with a diameter of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.3 μm or more, the filling rate in the adhesive (paste liquid) is high. As a result, a uniform and stable adhesive film can be obtained, which contributes to the improvement of the adhesive strength of the adhesive.

In that case, if the configuration of claim 2 is adopted, the moisture content of the dry solids of 10% or less is suitable for fillers, and the dry solids aggregate and the required particle size is excessively large. As a result, there is no possibility that the adhesive strength of the adhesive for plywood will be lowered.

In addition, according to the configuration of claim 3, the woody biomass combustion ash is slurried, repeatedly finely pulverized by a wet pulverizer, and heated and dried by a dryer while it is being conveyed along a conveying pipeline of a required length. Therefore, there is no need for special transportation costs for the combustion ash, and the woody biomass combustion ash discharged from the boiler power plant can be efficiently recycled as a filler for adhesives for plywood. can.

As a device for manufacturing the filler, the woody biomass combustion ash is slurried using the washing water generated from the plywood pasting process of the plywood production line, and the wet pulverization is performed. Since the combustion ash slurry dryer utilizes steam supplied from a boiler power plant as a heating source, it is extremely rational and can be easily installed on the premises of a plywood manufacturing plant.

Further, according to the configuration of claim 4, the filler contained in the adhesive for plywood has a moisture content of 10% or less, an average particle size of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.1 μm. Since it is composed of the dry solid matter of the combustion ash slurry having a size of 3 μm or more, it is possible to ensure a high filling rate with no voids, and it is useful for improving the adhesive strength of the adhesive for plywood. As a filler, it has the advantage of being available at a significantly lower price than plywood adhesives.

In that case, if the configuration of claim 5 is adopted, 20 to 30 parts by weight of 100 parts by weight of the phenolic resin, which is the main agent of the adhesive for plywood, is a filler made of dry solids of the combustion ash slurry. It is a mixing ratio that can replace the total amount of calcium, and the filler consisting of the dry solids of the combustion ash slurry can be effectively used in place of the conventional filler, calcium carbonate.

1 is a schematic diagram showing the overall layout of equipment and process flow in a plywood manufacturing plant. FIG. It is a process flow figure of a plywood production line. FIG. 2 is a schematic diagram showing the configuration of a filler manufacturing line for plywood adhesives. FIG. 2 is a schematic diagram showing the whole of a modified embodiment corresponding to FIG. 1; FIG. 4 is a schematic diagram showing the configuration of a modified embodiment corresponding to FIG. 3;

Preferred embodiments of the present invention will be described in detail below based on the drawings. Figure 1 is a schematic diagram of the equipment layout and process flow in a plywood manufacturing plant. Thick solid arrows represent the process flow of the plywood manufacturing line, chain-line arrows represent the transport flow of various wood chips generated in the manufacturing process, and plywood adhesives. The process flow of the filler manufacturing line in the agent is indicated by thin solid arrows.

As shown in Figure 1, a woody biomass boiler power plant (Biomass Energy Center) (P) is installed on the premises of the plywood manufacturing plant (F), and from the boiler power plant (P) The supplied heat (steam) energy and electrical energy are effectively used in the plywood manufacturing line (A) in the plywood manufacturing plant (F) and in the line (B) for manufacturing plywood adhesive fillers from woody biomass combustion ash. It is designed to be

The boiler power plant (P) is of the steam turbine type and comprises a woody biomass boiler (10), a silo (11) for storing the woody biomass fuel, and an underwater conveyor (12). ) achieves maintenance of negative pressure in the boiler (10), extinguishing of woody biomass combustion ash (M), and prevention of scattering of combustion ash (M).

In that case, the combustion ash (M) is in a wet state after being subjected to water treatment. % or less is preferable.

Then, the woody biomass combustion ash (M) is transferred from the ash storage area (13) adjacent to the outside of the boiler power plant (P) to a plywood adhesive filler production line ( The ash is transported to the ash storage supply device (15) located at the transportation start point of B) and temporarily stored there.

On the other hand, the plywood manufacturing line (A) arranged in the plywood manufacturing plant (F) is mainly for structural plywood, and as shown by the thick solid arrow in FIG. 1 and the process flow in FIG. Steaming step (16) to raw wood stripping step (17) → veneer drying step (18) → veneer sorting/preparing step (19) → pasting (joining) step (20) → cold pressing (temporary pressing) step (21)→Heat pressing (main molding) process (22)→Size cutting and sanding (surface finishing) process (23)→Inspection process (24). By passing through, the target plywood is manufactured.

Since the manufacturing method according to the process flow of the plywood production line (A) has been commonly practiced in the past, detailed description thereof will be omitted. The adhesive, especially the filler which is the material thereof, is unique to the present invention and has novelty, as will be described later.

In the plywood manufacturing process, cores and shavings generated from the raw wood stripping process (17), veneer scraps generated from the veneer preparation process (19), and cutting to size and sanding process (23) As indicated by the chain-line arrows in FIG. 1, the generated cutting chips, sanding powder, etc., are all transported to wood waste transport pipes (25a), (25b), and (25c) by screw conveyors, chain conveyors, air blowers, and other transport means (not shown). are concentrated and transported to the silo (11) of the boiler power plant (P) and stored there.

In addition, the bark generated from the outdoor log storage area (26) adjacent to the plywood manufacturing plant (F) and the log steaming process (16), the pasting process (20), the cold pressing process (21), and the hot pressing process ( 22) Veneer chips generated from the veneer drying process (18) and unusable raw wood are pulverized by a wood hogger (27) and then transported intensively to a fuel input line (28) by a vehicle such as a wheel loader. Then, from the bottom of the fuel input line (28), it is also conveyed to the silo (11) by a screw conveyor, a chain conveyor, and other conveying means (not shown) of the wood waste conveying pipe (25d), and all the various Wood chips are supplied as woody biomass fuel to the boiler (10) of the boiler power plant (P) without waste. (29) is a place for wood hogger (crusher).

Next, the line (B) for producing a plywood adhesive filler from the woody biomass combustion ash (M) will be described with reference to FIGS. M) from the stockpile supply device (15) to a slurry dryer described later, a conveying pipeline (30) laid by a required length, and the combustion ash (M) is slurried and the combustion ash In order to wet-pulverize the slurry, a pulverizer (tower-type pulverizer) (31) interposed and installed in the middle of the conveying pipe (30), and stirring for temporarily storing the combustion ash slurry after the wet-pulverization. It is equipped with a slurry receiving tank (33) with a machine (32).

Combustion ash (M) in a wet state with a water content of preferably 30% or less after undergoing hydration treatment by the underwater conveyor (12) of the boiler power plant (P) is discharged from the storage supply device (15) to the bottom thereof As shown in FIG. 3, the powder is conveyed to the wet pulverizer (31) through the flight conveyor (34) and the screw conveyor (35) of the filler production line (B) by a screw conveyor (not shown) provided in the A fixed amount of powder is introduced from the upper portion (input port) of the pulverizer (31).

Similarly, industrial water (fresh water) or process wastewater as a diluent (adjustment liquid) for slurrying the combustion ash (M) is also introduced from another upper portion (input port) of the pulverizer (31). It's like In that case, the water inlet of the pulverizer (31) and the sticking process (20) of the plywood production line (A) are connected by a water supply pipe (not shown), and the sticking process ( 20) is used as a diluent (adjustment liquid) for making the slurry. If washing water is not available at the plywood manufacturing plant (F) after the holidays, industrial water (new water) may be used instead.

As is clear from FIG. 3, the wet pulverizer (31) agitates the pulverizing balls (38) with the screw (helical liner) (37) of the agitator (36), and the balls (38) It is an apparatus for wet pulverizing combustion ash slurry, and the pulverized combustion ash slurry is automatically sent to an elutriation tank (39) by overflow, and stirred by a stirrer (40) in the elutriation tank (39). As a result, those with large particle sizes settle to the bottom of the elutriation tank (39) and are separated.

The sedimented combustion ash slurry with still large particle diameters is sent again to the pulverizer (31) by a circulation pump (41) such as a hose pump, and is repeatedly pulverized to the target particle diameter during the circulation. It has become. The target particle size of the combustion ash slurry is an average particle size of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.3 μm. defined above.

In that case, if the average particle size of the combustion ash slurry is smaller than 4 μm and the minimum particle size is smaller than 0.3 μm, the viscosity of the adhesive for plywood tends to increase over time, resulting in poor pasting workability. Therefore, it is not preferable. On the other hand, if the average particle size is larger than 50 μm and the maximum particle size is larger than 100 μm, the filler in the adhesive tends to settle, making it difficult to apply the adhesive uniformly to the veneer.

In addition, regarding the quantitative input of the woody biomass combustion ash (M) to the pulverizer (31), a slurry concentration meter (gamma ray type density meter) (42 ), it is necessary to constantly monitor the concentration (solid content concentration) of the combustion ash slurry in the pulverizer (31) and adjust and control the concentration.

In this regard, if unpulverized combustion ash is additionally added in order to increase the above concentration, the particle size of the combustion ash slurry becomes coarse, so it is necessary to dilute (adjust) only by adding industrial water or process wastewater. Therefore, it is desirable that the amount of the combustion ash input to the pulverizer (31) is about 2 to 5% higher than the target concentration in preparation for concentration fluctuations during wet pulverization.

In any case, during the slurrying of the woody biomass combustion ash by the pulverizer (31) and the wet pulverization thereof, process wastewater or industrial water generated from the plywood manufacturing process is put into the pulverizer (31), The concentration (solid content concentration) of the combustion ash slurry is diluted (adjusted) so that it is finally less than 40% by mass.

Regarding the above slurry concentration, it is necessary to limit the amount of water input so that the amount of water contained in the combustion ash slurry does not exceed the standard for the amount of water blended in the adhesive, in relation to the viscosity adjustment of the adhesive for plywood. In that sense, the higher the slurry concentration and the lower the water content, the more woody biomass combustion ash can be used. When it is used as a filler, which is a material for adhesives for industrial applications, it is not preferable because the adhesive strength of the adhesive may be lowered, and fluidity may be deteriorated, causing difficulties in pulverization and transportation.

The combustion ash slurry finely pulverized to the target particle size is then discharged from the mid-height position (discharge port) of the pulverizer (tower pulverizer) (31) shown in FIG. 3 by the first pump (43). , is discharged into a slurry receiving tank (33) with an agitator (32), temporarily stored in the tank (33), and then pumped from there to a dryer (45) by a second pump (44), where it is dried. Together with the circulation pump (46) of the machine (45), the drying is repeated by heating.

The dryer (45) repeatedly dries the combustion ash slurry using steam supplied from the woody biomass boiler power plant (P) as a heating source, thereby providing a plywood adhesive filler necessary for plywood production. and is installed at the terminal position of the conveying pipeline (30). (47) indicates the exhaust fan of the dryer (45).

In that case, the moisture content of the dry solids in the combustion ash slurry is set to 10% or less, preferably 5 to 10%, which is suitable for fillers for adhesives for plywood. If the water content exceeds 10%, the dry solids aggregate and become larger than the required particle size, which may reduce the adhesive strength of the adhesive.

In any event, the dried solids of the combustion ash slurry, which are to be plywood adhesive filler, are received from the dryer (45) into a solids storage station (48) for use as adhesive filler. Until it is done, it will be stockpiled in the storage place (48).

In the present invention, the filler composed of the dry solid matter of the wet-pulverized combustion ash slurry is added at a ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the phenolic resin (aqueous solution) as the main agent, and other curing acceleration A plywood adhesive is prepared by mixing 1 part by weight of an agent (sodium bicarbonate), 10 parts by weight of flour and 4 parts by weight of a viscosity modifier (water).

Then, the filler composed of the dry solids of the combustion ash slurry has no voids and does not contain air like the conventionally known fillers of wood flour and bark powder. Combined with the numerical value, it maintains a high-density property, and as a result, the filling rate in the plywood adhesive (paste liquid) increases, making it suitable as a filler and helping to improve the adhesive strength of the adhesive.

Calcium carbonate, which is commonly used as a filler in adhesives for plywood, is inexpensive, but requires procurement and maintenance costs. There is also a problem that the cutting tools used in the size cutting process (23) of the plywood production line (A) are easily worn and must be replaced at an early stage.

In this regard, the filler composed of the dry solid matter of the combustion ash slurry effectively uses the woody biomass combustion ash generated from the boiler power plant (P) of the plywood manufacturing plant (F), and its hardness is also calcium carbonate. Since it is much softer than calcium carbonate, it does not have the above problem, and it is more alkaline (pH: 11.75 or higher) than calcium carbonate, so it is alkaline when producing an aqueous solution of phenolic resin, which is the main agent of adhesives for plywood. It also has the advantage that it works effectively as a reaction catalyst and can efficiently cure the plywood adhesive in a short period of time.

Next, FIGS. 4 and 5 are schematic diagrams showing a modified embodiment of the invention corresponding to FIGS. A solids receiving tank (49) is installed instead of the above, and the dried solids of the combustion ash slurry are conveyed from the dryer (45) to the solids receiving tank (49) by the screw conveyor (50), and once It can be stockpiled.

From the solid matter receiving tank (49), every time the dried solid matter is used as a filler for plywood adhesive, the first and second screw conveyors (51) and (52) and the bucket conveyor (53) are fed therefrom. ) to the weighing tank (54), and the required amount of the above-mentioned dry solid weighed in the weighing tank (54) is further transferred to the mixer (mixing tank with stirrer) (56) by the third screw conveyor (55). ).

The dried solid matter of the combustion ash slurry is mixed and prepared as a filler for plywood adhesive in a predetermined ratio with the phenolic resin (aqueous solution) as the main agent already exemplified and other necessary materials in a mixer (56). , the prepared plywood adhesive is pumped from the mixer (56) by the third pump (57) to the application step (20) of the plywood production line (A). It will be used to glue the boards together.

According to the configuration of the filler production line shown in FIGS. 4 and 5, the filler consisting of the dried solid matter of the woody biomass combustion ash slurry is used as an adhesive for plywood after the production of the filler, and the solid matter is received. The tank (49) is fed to a mixer (56) that mixes and prepares the phenolic resin (aqueous solution) as the main agent and other materials, and the prepared adhesive is further pasted from the mixer (56) to the plywood production line (A). There is an advantage that the supply up to step (20) can be performed as an automated line, so to speak.

In any case, the filler composed of the dry solids (granules) of the combustion ash slurry is used as the main ingredient of the adhesive for plywood instead of the total amount of calcium carbonate that has been generally used as a filler. It can be used at a mixing ratio of 20 to 30 parts by weight per 100 parts by weight of the phenolic resin (aqueous solution).

(10)...Wood biomass boiler (11)...Silo (12)...Underwater conveyor (13)...Ash storage area (14)...Transportation vehicle (15)...Ash stockpile supply device (30) Conveying pipeline (31) Grinding device (32) (36) (40) Stirrer (33) Slurry receiving tank (34) Flight conveyor (35) ) (50) (51) (52) (55) Screw conveyor (37) Screw (38) Grinding ball (39) Elutriation tank (41) (46)・Circulation pump (42) Slurry concentration meter (43) (44) (57) Pump (45) Dryer (48) Solid storage area (49) Solid Receiving tank (53) Bucket conveyor (54) Weighing tank (56) Mixer (A) Plywood production line (B) Plywood adhesive filler Production line (F) Plywood manufacturing plant (M) Woody biomass combustion ash (P) Boiler power plant

The present invention relates to a method and apparatus for producing a filler in an adhesive for plywood, and a method for producing an adhesive for plywood using the filler .

Bark, stripped cores, and various types of wood waste generated at plywood manufacturing plants can be turned into woody biomass fuel that can contribute to the reduction of carbon dioxide (CO2) emissions from the perspective of carbon neutrality. This will contribute to the spread of steam turbine-type woody biomass boiler power plants that use this.

According to this, the heat (steam) and power required for plywood production can be covered by the energy supplied from the boiler power plant, but on the other hand, the more plywood is mass-produced, the more the boiler burns. As ash is generated, more and more plywood adhesives are needed in the assembly line process.

The above-mentioned woody biomass boiler combustion ash (hereinafter simply referred to as "woody biomass combustion ash") does not include construction waste materials, so if it is effectively used, it is not considered as industrial waste. Due to the cost of processing, transportation, and manufacturing, it is not being used effectively, and plywood manufacturers and power generation companies are still disposing of it as industrial waste for a fee. there is

In this regard, a single woody biomass combustion ash that does not contain municipal waste, construction waste, or other waste can be used as a fertilizer, a soil conditioner, an abrasive, an additive for various plastics, a heat insulating material or a fireproof material as a building material. Such use is described in Patent Documents 1 to 4, but the woody biomass combustion ash generated from the boiler power plant of the plywood manufacturing plant is used as a filler that becomes a material for adhesives for plywood, and the plywood is used. Recycling for manufacturing is not disclosed. If such a use can be developed, it is thought that transportation costs and manufacturing costs for the combustion ash will become unnecessary.

Japanese Patent No. 6391603 JP 2016-166115 A JP-A-2009-35641 JP 2018-58717 A

Problem to be solved by the invention and means for solving the problem

The present invention has been devised in response to the current demands as described above, in particular, so that the woody biomass combustion ash generated from a woody biomass boiler power plant can be effectively recycled in the production of plywood. As a method for producing a filler in an adhesive for plywood, in claim 1, woody biomass combustion ash discharged from a woody biomass boiler power plant is conveyed along a conveying pipeline that is piped from the storage supply device to the dryer. Slurry with water supply at, and the slurried combustion ash slurry at a concentration of less than 40% by mass,

Wet grinding until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,

The pulverized combustion ash slurry is heated and dried by a dryer using steam supplied from the boiler power plant as a heating source,

It is characterized by obtaining a solid matter that becomes a filler for adhesives for plywood.

A second aspect of the present invention is characterized in that the moisture content of the solid matter that becomes the filler of the adhesive for plywood is set to 10% or less.

Further, in claim 3, a woody biomass boiler power plant that supplies thermoelectric energy to a plywood production line as a manufacturing device for a filler in an adhesive for plywood,

a conveying line running a required length starting from a storage supply device for pre-hydrated woody biomass combustion ash in the boiler power plant and ending with a dryer;

While the woody biomass combustion ash is being conveyed along the conveyance pipeline, it is slurried by supplying washing water generated from the plywood sticking process of the plywood production line, and the slurried combustion ash slurry is less than 40% by mass. In order to wet-mill at a concentration,

a wet pulverizing device interposed and installed in the middle of the conveying pipeline;

A dryer also installed at the end point of the conveying pipeline to heat and dry the combustion ash slurry after pulverization by the pulverizing device using the steam supplied from the boiler power plant as a heating source,

The combustion ash slurry is repeatedly pulverized by the pulverizer until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,

The pulverized combustion ash slurry is heat-dried by the above-mentioned dryer to obtain a solid material that will be used as a filler for an adhesive for plywood.

Furthermore, in claim 4, as a method for producing a plywood adhesive, the dry solid obtained by the production method according to claim 1 is used as a filler, and 20 to 30 parts by weight of It is characterized by mixing only the ratio .

According to the above configuration of claim 1, the entire amount of woody biomass combustion ash generated from a woody biomass boiler power plant that is attached to a plywood manufacturing plant, so to speak, is burned without wasting it. It is possible to mass-produce a filler that is effective as a material for adhesives for plywood from ash, and by using this, procurement costs and maintenance costs for calcium carbonate, which has been generally used as a filler, can be reduced. There is an effect that can be reduced.

Moreover, the filler for the adhesive for plywood is obtained by wet pulverizing the combustion ash slurry, which is a slurry of woody biomass combustion ash, at a concentration (solid content concentration) of less than 40% by mass, and then heating and drying to obtain the average particle Since it is solidified as a solid substance (powder) with a diameter of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.3 μm or more, the filling rate in the adhesive (paste liquid) is high. As a result, a uniform and stable adhesive film can be obtained, which contributes to the improvement of the adhesive strength of the adhesive.

In that case, if the configuration of claim 2 is adopted, the moisture content of the dry solids of 10% or less is suitable for fillers, and the dry solids aggregate and the required particle size is excessively large. As a result, there is no possibility that the adhesive strength of the adhesive for plywood will be lowered.

In addition, according to the configuration of claim 3, the woody biomass combustion ash is slurried, repeatedly finely pulverized by a wet pulverizer, and heated and dried by a dryer while it is being conveyed along a conveying pipeline of a required length. Therefore, there is no need for special transportation costs for the combustion ash, and the woody biomass combustion ash discharged from the boiler power plant can be efficiently recycled as a filler for adhesives for plywood. can.

As a device for manufacturing the filler, the woody biomass combustion ash is slurried using the washing water generated from the plywood pasting process of the plywood production line, and the wet pulverization is performed. Since the combustion ash slurry dryer utilizes steam supplied from a boiler power plant as a heating source, it is extremely rational and can be easily installed on the premises of a plywood manufacturing plant.

Furthermore, according to the configuration of claim 4, the filler composed of the dry solids of the combustion ash slurry does not contain air, so it can maintain a high density property and ensure a high filling rate. As a result, the adhesive for plywood 20 to 30 parts by weight per 100 parts by weight of phenolic resin, which is the main ingredient of the adhesive, is a mixing ratio that can replace the above dry solid filler with the total amount of calcium carbonate. It also has the advantage that it can be effectively used in place of the conventional filler, calcium carbonate.

1 is a schematic diagram showing the overall layout of equipment and process flow in a plywood manufacturing plant. FIG. It is a process flow figure of a plywood production line. FIG. 2 is a schematic diagram showing the configuration of a filler manufacturing line for plywood adhesives. FIG. 2 is a schematic diagram showing the whole of a modified embodiment corresponding to FIG. 1; FIG. 4 is a schematic diagram showing the configuration of a modified embodiment corresponding to FIG. 3;

Preferred embodiments of the present invention will be described in detail below based on the drawings. Figure 1 is a schematic diagram of the equipment layout and process flow in a plywood manufacturing plant. Thick solid arrows represent the process flow of the plywood manufacturing line, chain-line arrows represent the transport flow of various wood chips generated in the manufacturing process, and plywood adhesives. The process flow of the filler manufacturing line in the agent is indicated by thin solid arrows.

As shown in Figure 1, a woody biomass boiler power plant (Biomass Energy Center) (P) is installed on the premises of the plywood manufacturing plant (F), and from the boiler power plant (P) The supplied heat (steam) energy and electrical energy are effectively used in the plywood manufacturing line (A) in the plywood manufacturing plant (F) and in the line (B) for manufacturing plywood adhesive fillers from woody biomass combustion ash. It is designed to be

The boiler power plant (P) is of the steam turbine type and comprises a woody biomass boiler (10), a silo (11) for storing the woody biomass fuel, and an underwater conveyor (12). ) achieves maintenance of negative pressure in the boiler (10), extinguishing of woody biomass combustion ash (M), and prevention of scattering of combustion ash (M).

In that case, the combustion ash (M) is in a wet state after being subjected to water treatment. % or less is preferable.

Then, the woody biomass combustion ash (M) is transferred from the ash storage area (13) adjacent to the outside of the boiler power plant (P) to a plywood adhesive filler production line ( The ash is transported to the ash storage supply device (15) located at the transportation start point of B) and temporarily stored there.

On the other hand, the plywood manufacturing line (A) arranged in the plywood manufacturing plant (F) is mainly for structural plywood, and as shown by the thick solid arrow in FIG. 1 and the process flow in FIG. Steaming step (16) to raw wood stripping step (17) → veneer drying step (18) → veneer sorting/preparing step (19) → pasting (joining) step (20) → cold pressing (temporary pressing) step (21)→Heat pressing (main molding) process (22)→Size cutting and sanding (surface finishing) process (23)→Inspection process (24). By passing through, the target plywood is manufactured.

Since the manufacturing method according to the process flow of the plywood production line (A) has been commonly practiced in the past, detailed description thereof will be omitted. The adhesive, especially the filler which is the material thereof, is unique to the present invention and has novelty, as will be described later.

In the plywood manufacturing process, cores and shavings generated from the raw wood stripping process (17), veneer scraps generated from the veneer preparation process (19), and cutting to size and sanding process (23) As indicated by the chain-line arrows in FIG. 1, the generated cutting chips, sanding powder, etc., are all transported to wood waste transport pipes (25a), (25b), and (25c) by screw conveyors, chain conveyors, air blowers, and other transport means (not shown). are concentrated and transported to the silo (11) of the boiler power plant (P) and stored there.

In addition, the bark generated from the outdoor log storage area (26) adjacent to the plywood manufacturing plant (F) and the log steaming process (16), the pasting process (20), the cold pressing process (21), and the hot pressing process ( 22) Veneer chips generated from the veneer drying process (18) and unusable raw wood are pulverized by a wood hogger (27) and then transported intensively to a fuel input line (28) by a vehicle such as a wheel loader. Then, from the bottom of the fuel input line (28), it is also conveyed to the silo (11) by a screw conveyor, a chain conveyor, and other conveying means (not shown) of the wood waste conveying pipe (25d), and all the various Wood chips are supplied as woody biomass fuel to the boiler (10) of the boiler power plant (P) without waste. (29) is a place for wood hogger (crusher).

Next, the line (B) for producing a plywood adhesive filler from the woody biomass combustion ash (M) will be described with reference to FIGS. M) from the stockpile supply device (15) to a slurry dryer described later, a conveying pipeline (30) laid by a required length, and the combustion ash (M) is slurried and the combustion ash In order to wet-pulverize the slurry, a pulverizer (tower-type pulverizer) (31) interposed and installed in the middle of the conveying pipe (30), and stirring for temporarily storing the combustion ash slurry after the wet-pulverization. It is equipped with a slurry receiving tank (33) with a machine (32).

Combustion ash (M) in a wet state with a water content of preferably 30% or less after undergoing hydration treatment by the underwater conveyor (12) of the boiler power plant (P) is discharged from the storage supply device (15) to the bottom thereof As shown in FIG. 3, the powder is conveyed to the wet pulverizer (31) through the flight conveyor (34) and the screw conveyor (35) of the filler production line (B) by a screw conveyor (not shown) provided in the A fixed amount of powder is introduced from the upper portion (input port) of the pulverizer (31).

Similarly, industrial water (fresh water) or process wastewater as a diluent (adjustment liquid) for slurrying the combustion ash (M) is also introduced from another upper portion (input port) of the pulverizer (31). It's like In that case, the water inlet of the pulverizer (31) and the sticking process (20) of the plywood production line (A) are connected by a water supply pipe (not shown), and the sticking process ( 20) is used as a diluent (adjustment liquid) for making the slurry. If washing water is not available at the plywood manufacturing plant (F) after the holidays, industrial water (new water) may be used instead.

As is clear from FIG. 3, the wet pulverizer (31) agitates the pulverizing balls (38) with the screw (helical liner) (37) of the agitator (36), and the balls (38) It is an apparatus for wet pulverizing combustion ash slurry, and the pulverized combustion ash slurry is automatically sent to an elutriation tank (39) by overflow, and stirred by a stirrer (40) in the elutriation tank (39). As a result, those with large particle sizes settle to the bottom of the elutriation tank (39) and are separated.

The sedimented combustion ash slurry with still large particle diameters is sent again to the pulverizer (31) by a circulation pump (41) such as a hose pump, and is repeatedly pulverized to the target particle diameter during the circulation. It has become. The target particle size of the combustion ash slurry is an average particle size of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.3 μm. defined above.

In that case, if the average particle size of the combustion ash slurry is smaller than 4 μm and the minimum particle size is smaller than 0.3 μm, the viscosity of the adhesive for plywood tends to increase over time, resulting in poor pasting workability. Therefore, it is not preferable. On the other hand, if the average particle size is larger than 50 μm and the maximum particle size is larger than 100 μm, the filler in the adhesive tends to settle, making it difficult to apply the adhesive uniformly to the veneer.

In addition, regarding the quantitative input of the woody biomass combustion ash (M) to the pulverizer (31), a slurry concentration meter (gamma ray type density meter) (42 ), it is necessary to constantly monitor the concentration (solid content concentration) of the combustion ash slurry in the pulverizer (31) and adjust and control the concentration.

In this regard, if unpulverized combustion ash is additionally added in order to increase the above concentration, the particle size of the combustion ash slurry becomes coarse, so it is necessary to dilute (adjust) only by adding industrial water or process wastewater. Therefore, it is desirable that the amount of the combustion ash input to the pulverizer (31) is about 2 to 5% higher than the target concentration in preparation for concentration fluctuations during wet pulverization.

In any case, during the slurrying of the woody biomass combustion ash by the pulverizer (31) and the wet pulverization thereof, process wastewater or industrial water generated from the plywood manufacturing process is put into the pulverizer (31), The concentration (solid content concentration) of the combustion ash slurry is diluted (adjusted) so that it is finally less than 40% by mass.

Regarding the above slurry concentration, it is necessary to limit the amount of water input so that the amount of water contained in the combustion ash slurry does not exceed the standard for the amount of water blended in the adhesive, in relation to the viscosity adjustment of the adhesive for plywood. In that sense, the higher the slurry concentration and the lower the water content, the more woody biomass combustion ash can be used. When it is used as a filler, which is a material for adhesives for industrial applications, it is not preferable because the adhesive strength of the adhesive may be lowered, and fluidity may be deteriorated, causing difficulties in pulverization and transportation.

The combustion ash slurry finely pulverized to the target particle size is then discharged from the mid-height position (discharge port) of the pulverizer (tower pulverizer) (31) shown in FIG. 3 by the first pump (43). , is discharged into a slurry receiving tank (33) with an agitator (32), temporarily stored in the tank (33), and then pumped from there to a dryer (45) by a second pump (44), where it is dried. Together with the circulation pump (46) of the machine (45), the drying is repeated by heating.

The dryer (45) repeatedly dries the combustion ash slurry using steam supplied from the woody biomass boiler power plant (P) as a heating source, thereby providing a plywood adhesive filler necessary for plywood production. and is installed at the terminal position of the conveying pipeline (30). (47) indicates the exhaust fan of the dryer (45).

In that case, the moisture content of the dry solids in the combustion ash slurry is set to 10% or less, preferably 5 to 10%, which is suitable for fillers for adhesives for plywood. If the water content exceeds 10%, the dry solids aggregate and become larger than the required particle size, which may reduce the adhesive strength of the adhesive.

In any event, the dried solids of the combustion ash slurry, which are to be plywood adhesive filler, are received from the dryer (45) into a solids storage station (48) for use as adhesive filler. Until it is done, it will be stockpiled in the storage place (48).

In the present invention, the filler composed of the dry solid matter of the wet-pulverized combustion ash slurry is added at a ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the phenolic resin (aqueous solution) as the main agent, and other curing acceleration A plywood adhesive is prepared by mixing 1 part by weight of an agent (sodium bicarbonate), 10 parts by weight of flour and 4 parts by weight of a viscosity modifier (water).

Then, the filler composed of the dry solids of the combustion ash slurry has no voids and does not contain air like the conventionally known fillers of wood flour and bark powder. Combined with the numerical value, it maintains a high-density property, and as a result, the filling rate in the plywood adhesive (paste liquid) increases, making it suitable as a filler and helping to improve the adhesive strength of the adhesive.

Calcium carbonate, which is commonly used as a filler in adhesives for plywood, is inexpensive, but requires procurement and maintenance costs. There is also a problem that the cutting tools used in the size cutting process (23) of the plywood production line (A) are easily worn and must be replaced at an early stage.

In this regard, the filler composed of the dry solid matter of the combustion ash slurry effectively uses the woody biomass combustion ash generated from the boiler power plant (P) of the plywood manufacturing plant (F), and its hardness is also calcium carbonate. Since it is much softer than calcium carbonate, it does not have the above problem, and it is more alkaline (pH: 11.75 or higher) than calcium carbonate, so it is alkaline when producing an aqueous solution of phenolic resin, which is the main agent of adhesives for plywood. It also has the advantage that it works effectively as a reaction catalyst and can efficiently cure the plywood adhesive in a short period of time.

Next, FIGS. 4 and 5 are schematic diagrams showing a modified embodiment of the invention corresponding to FIGS. A solids receiving tank (49) is installed instead of the above, and the dried solids of the combustion ash slurry are conveyed from the dryer (45) to the solids receiving tank (49) by the screw conveyor (50), and once It can be stockpiled.

From the solid matter receiving tank (49), every time the dried solid matter is used as a filler for plywood adhesive, the first and second screw conveyors (51) and (52) and the bucket conveyor (53) are fed therefrom. ) to the weighing tank (54), and the required amount of the above-mentioned dry solid weighed in the weighing tank (54) is further transferred to the mixer (mixing tank with stirrer) (56) by the third screw conveyor (55). ).

The dried solid matter of the combustion ash slurry is mixed and prepared as a filler for plywood adhesive in a predetermined ratio with the phenolic resin (aqueous solution) as the main agent already exemplified and other necessary materials in a mixer (56). , the prepared plywood adhesive is pumped from the mixer (56) by the third pump (57) to the application step (20) of the plywood production line (A). It will be used to glue the boards together.

According to the configuration of the filler production line shown in FIGS. 4 and 5, the filler consisting of the dried solid matter of the woody biomass combustion ash slurry is used as an adhesive for plywood after the production of the filler, and the solid matter is received. The tank (49) is fed to a mixer (56) that mixes and prepares the phenolic resin (aqueous solution) as the main agent and other materials, and the prepared adhesive is further pasted from the mixer (56) to the plywood production line (A). There is an advantage that the supply up to step (20) can be performed as an automated line, so to speak.

In any case, the filler composed of the dry solids (granules) of the combustion ash slurry is used as the main ingredient of the adhesive for plywood instead of the total amount of calcium carbonate that has been generally used as a filler. It can be used at a mixing ratio of 20 to 30 parts by weight per 100 parts by weight of the phenolic resin (aqueous solution).

(10) ... woody biomass boiler
(11) Silo
(12) ... Underwater conveyor
(13)...Ash place
(14)...transportation vehicle
(15) ... ash storage supply device
(30)... Conveyance pipeline
(31) ... crushing device
(32) (36) (40) ... Stirrer
(33) Slurry receiving tank
(34) ... flight conveyor
(35) (50) (51) (52) (55) Screw conveyor
(37) Screw
(38) ... crushing ball
(39) ... elutriation tank
(41) (46) Circulation pump
(42) Slurry concentration meter
(43) (44) (57) Pump
(45) ... dryer
(48) … solid object storage area
(49) ... solid matter receiving tank
(53) ... Bucket conveyor
(54) ... Weighing tank
(56) ... Mixer
(A) Plywood production line
(B) ・・・・Production line for fillers for adhesives for plywood
(F) Plywood manufacturing plant
(M) ... Woody biomass combustion ash
(P) Boiler power plant

Claims (5)

The woody biomass combustion ash discharged from the woody biomass boiler power plant is slurried by water supply during transportation along the transportation pipeline piped from the storage supply device to the dryer, and the slurried combustion ash slurry is made into 40. At concentrations less than % by weight,
Wet grinding until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,
The pulverized combustion ash slurry is heated and dried by a dryer using steam supplied from the boiler power plant as a heating source,
A method for producing a filler in an adhesive for plywood, characterized by obtaining a solid matter which becomes a filler for the adhesive for plywood. 2. The method for producing a filler in an adhesive for plywood according to claim 1, wherein the water content of the solid matter to be the filler for the adhesive for plywood is set to 10% or less. A woody biomass boiler power plant that supplies thermoelectric energy to the plywood production line,
a conveying line running a required length starting from a storage supply device for pre-hydrated woody biomass combustion ash in the boiler power plant and ending with a dryer;
While the woody biomass combustion ash is being conveyed along the conveyance pipeline, it is slurried by supplying washing water generated from the plywood sticking process of the plywood production line, and the slurried combustion ash slurry is less than 40% by mass. To wet-mill at a concentration,
a wet pulverizing device interposed and installed in the middle of the conveying pipeline;
A dryer also installed at the end point of the conveying pipeline to heat and dry the combustion ash slurry after pulverization by the pulverizing device using the steam supplied from the boiler power plant as a heating source,
The combustion ash slurry is repeatedly pulverized by the pulverizer until the average particle size is 4 to 50 μm, the maximum particle size is 100 μm or less, and the minimum particle size is 0.3 μm or more,
An apparatus for producing a filler in an adhesive for plywood, wherein the pulverized combustion ash slurry is heated and dried by the dryer to obtain a solid matter to be a filler for the adhesive for plywood. An aqueous solution of a phenolic resin as a main agent and an average particle size of 4 to 50 μm, a maximum particle size of 100 μm or less, and a minimum particle size of 0.3 μm or more obtained by the production method according to claim 2, and A plywood adhesive characterized by containing a solid filler having a moisture content of 10% or less. 5. The plywood adhesive according to claim 4, wherein the content of the filler is 20 to 30 parts by weight with respect to 100 parts by weight of the phenolic resin.

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