JP2014126229A - Lumber dryer and lumber drying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an oil palm lumber to be dried in such a degree as one in which mold and bacteria do not show any breeding and prevent them from influencing its succeeding processing.SOLUTION: There are provided heater plates N for heating both surfaces of oil palm materials W in which an oil palm trunk WD of predetermined length is cut to a predetermined thickness in its longitudinal direction. These oil palm materials W and the heater plates N are housed in a housing chamber 50, its inside part is separated from surrounding atmospheric pressure and controlled. Then, application of a press machine causes the heater plates N to compress against the oil palm materials W with predetermined pressure. Accordingly, the oil palm materials W are heated by the heater plates N, their moisture vapor is discharged out of the housing chamber 50 through a pump 49, so that moisture vapor generated through heating operation and moisture generated through deaeration as required are discharged out to enable their drying efficiency to be increased. In addition, since the oil palm materials W are heated and compressed with heater plates N, heat of the heater plates fully reaches to a core part of the oil palm materials W to enable entire drying to be rapidly carried out.

Description

The present invention relates to a drying apparatus for oil palm or wood obtained from oil palm (oil palm), which is a kind of palm, and a method for drying the same, and an oil palm trunk having a predetermined length is arranged in the circumferential direction. In particular, the present invention relates to an oil palm material or a wood drying apparatus and a drying method thereof in which the oil palm material stripped to a predetermined thickness and the oil palm trunk having a predetermined length are sawn to a predetermined thickness in the longitudinal direction.
In general, “board” is described as “thin timber thin and flat” or “thin metal or stone thin and flat” according to Kojien, but here, oil palm is made of wood. It does not have properties, but has properties close to bamboo, but in oil palm, `` thin and flat '' is called `` board '', and materials including thick board, pillars, etc. are called oil palm To do. In particular, since there is no term that specifically refers to the material of oil palm, it is treated in the same way as wood. Naturally, the wood drying apparatus and the drying method also include a wood drying apparatus and the drying method.

  In general, an oil palm tree consists of a single trunk and reaches a height of 10 to 20 m or more. The leaves are wing-shaped and about 3-5 m long, about 30 young trees a year, and about 20 new trees grow over 10 years old. The flower is composed of 3 petals and 3 cocoons, each of which forms a small but dense group, and it takes about 6 months from fruiting until the fruit ripens. The fruit consists of a fleshy flesh (medium peel) with a lot of oil and one seed that is also rich in oil, and the weight of the fruit is about 40-50 kg per bunch.

  It has been cultivated in plantations in Southeast Asia since the latter half of the 19th century. Palm oil, a vegetable oil that can be extracted from oil palm, is more productive and cheaper than other vegetable oils such as soybeans and rapeseed. Therefore, it is used for foods such as margarine and oil for fried foods. It is also widely used in soaps and cosmetics. In recent years, palm oil has been exported from Southeast Asia such as Malaysia and Indonesia to Japan. Therefore, oil palm sometimes refers to the meaning of fats and oils that can be taken from the pulp and seeds and the trunk of the oil palm itself.

In general, oil palm is a general term for plants classified into the genus Oil palm, and two types of oil palm are known: Elaeis guineensis, native to West Africa, and American oil palm (Elaeis oleifera), native to Central and South America. Among the cultivars, there is a hybrid of Guinea oil palm and American oil palm. In particular, oil palm (oil palm), which is a kind of palm used as a raw material for vegetable oils and fats, may be referred to as “oil palm”.
In other words, oil palm takes fats and oils from pulp and seeds, and the amount of fats and oils obtained per unit area is superior to other plants, so large-scale plantations mainly in Southeast Asian countries such as Malaysia as commercial crops. Because agriculture is carried out, it may be becoming more prominent to call the oil and fat “oil palm”.
However, in the present invention, it does not mean the oil palm of fats and oils that can be taken from the pulp and seeds, but the trunk of the oil palm itself or the whole plant is called oil palm.

  Patent applications dealing with this oil palm include those disclosed in Patent Document 1 (invention dealing with empty fruit bunch). In patent document 1, the manufacturing method of the building material using oil palm is disclosed. Specifically, after the palm fiber is washed, it is dried so that the dry oil becomes 95%, and the dried palm fiber is broken and cut in units of 1 to 1.5 cm to produce a palm fiber chip. Pulverizing the dried palm fiber with a particle size of 200 mesh, pulverizing bamboo with a particle size of 200 mesh, the palm fiber chip, the palm fiber powder, the bamboo powder, and the bioceramic powder Are prepared in a ratio of 1: 1: 1: 1 to produce a main raw material, a step of extracting fly ash having a particle size of 200 mesh from coal carbide, a flame inhibitor and a heat resistant resin. A step of producing a binder by mixing and melting a flame retardant resin for curing at a ratio of 1: 1, 20 to 30% by weight of the produced binder, 50 to 60% by weight of the mixed main raw material, and 20 to 20% fly ash A step of mixing 5% by weight of powder and kneading in a high liquid state, a step of passing the bend through a molding part that radiates a temperature of 150 to 200 ° C. and baking it first, and a large number of the baked moldings Rolling the sheet with a gradually reduced thickness by passing between the rolling parts arranged so that the distance between the upper roller group and the lower roller group gradually decreases toward the rear side, and a large number of the molded products. The process of freezing at 0-4 degreeC, passing the cooling part which consists of the upper roller group and lower roller group of, and the process of cut | disconnecting the said molded object by a fixed length unit with the blade raised / lowered by a cutting cylinder It consists of

  In this patent document 1, not only is it harmless to the human body by using palm fiber as the main raw material, but the palm fiber is cut with 1 to 1.5 cm and used together with palm fiber powder. It becomes a solid building material by acting as a temporary bridge with other contents, and antibacterial and deodorizing functions can be realized by bamboo and bioceramics. Further, generation of far infrared rays and anions can be expected without generating mold. And nonflammable waste material can be recycled and manufacturing cost becomes cheap. Furthermore, since no toxic gas is generated from all the compositions, it is said to be highly safe as a building material.

Further, in Patent Document 2 (invention dealing with empty fruit bunches), the plate-like body or molded body is made by attaching a resin having rubber-like elasticity to the oil palm fibers obtained by defibrating the empty fruit bunches of oil palm. A plate-like body or a molded body obtained by compression molding.
Therefore, the oil palm fiber obtained by defibrating the empty fruit bunch of oil palm has a fiber repellent property because, for example, palm oil adheres to the fiber surface compared to other palm fibers such as coconut palm fiber. The aqueous solution is excellent, and the amount of cellulose and lignin contained in the fiber is relatively large, so that the water resistance is excellent. In addition, the oil palm fiber has a high fiber strength, a large fiber diameter, and a long fiber length as compared with other palm fibers such as a coconut fiber, and therefore has excellent dimensional stability. In addition, since the oil palm fiber has large irregularities on the surface and high bending strength, and the entanglement between the fibers is large, the dimensional stability is also enhanced by this. Therefore, this plate-shaped body or molded body is excellent in dimensional stability during water absorption and moisture absorption.
And since the irregularities on the surface of the oil palm fiber are large, the resin exhibiting rubber-like elasticity penetrates into the voids on the surface of the oil palm fiber and solidifies or hardens, which acts like a nail or wedge, so-called anchor effect. Therefore, the oil palm fiber is strongly bonded to the resin having rubber-like elasticity. This is also considered to contribute to the improvement of dimensional stability at the time of water absorption and moisture absorption.

The oil palm fiber is superior in elasticity recovery properties, for example, because the fiber has a large rigidity and strength, a large fiber diameter, and a long fiber length, compared to other palm fibers such as coconut fiber. Yes. Further, the oil palm fiber has high fiber bending strength and large entanglement between the fibers, so that the elastic recovery is improved. And the resin which shows rubber-like elasticity has high elastic recovery property. Therefore, a plate-like body or molded body in which oil palm fibers are connected by a resin exhibiting rubber-like elasticity exhibits excellent elastic recovery, good walking feeling and cushioning properties, and good sound insulation.
Since this plate-like body or molded body uses oil palm fiber, less labor is required for defibration, etc., compared to other types of palm fiber, so that manufacturing costs and energy can be reduced, and the product is inexpensive. Become. For example, coconut fiber is immersed in water for a long period of time to soften the coconut shell, and then requires a great deal of energy for a long period of time to be mechanically fibrillated. On the other hand, oil palm defibrates empty fruit bunches that are originally in the form of fibers, so that there is no need for immersion in water, and very little energy is required for defibration. In addition, oil palm fibers have less dusting properties than coconut fibers, and the working environment can be prevented from deteriorating in handling.
Furthermore, since a large gap is formed between the fibers of the oil palm fiber, when a resin exhibiting rubber-like elasticity is supplied by spraying or dipping, the resin adheres evenly to all the fibers through the gap, and the strength distribution is A plate state of being uniform is obtained.

And in patent document 3 (invention of an oil palm trunk), the technique of the plywood which made the adhesive penetrate | infiltrate the fiber exposed on the surface of the several single board bonded together with the adhesive agent is disclosed.
The palm plywood according to Patent Document 3 includes a plurality of veneers bonded with a resin adhesive, and at least one of the plurality of veneers is a palm veneer, and a palm veneer. A resin adhesive is made to permeate palm fibers exposed on the surface. By using a palm veneer that can be manufactured from a palm trunk of inexpensive waste material, the surface is treated with a resin adhesive without using a veneer veneer with relatively good quality as a face and a back. Therefore, plywood is manufactured at low cost.
Moreover, the palm plywood of patent document 3 uses all the single veneers as palm veneers, uses only palm veneers that can be manufactured from palm trunks of inexpensive waste materials, and bonds them together with a resin adhesive. Also good. The resin adhesive permeated into the palm fiber at this time is the same type as the resin adhesive that bonds a plurality of single plates. Since the resin adhesive is the same system, the plywood can be manufactured at low cost. Here, the term “same system” includes the same resin adhesive and a composition whose composition (for example, composition ratio) is changed.

And the palm plywood of patent document 3 makes the palm fiber penetrate | infiltrate a resin adhesive after grind | polishing the surface which makes a palm fiber osmose | permeate a resin adhesive, reduces the palm fiber which protrudes from the plywood surface, and resin to palm fiber. The adhesive is permeated. This plywood manufacturing method includes a step of bonding a plurality of veneers with an adhesive, a step of polishing a surface of the plurality of veneers that allows the adhesive to penetrate into exposed fibers, and a polished surface. Applying adhesive to infiltrate the adhesive into the fiber and drying the adhesive, which makes it possible to use a relatively good quality wood veneer as a face and back without using it Plywood can be manufactured at cost.
Thus, according to Patent Document 3, a plywood, a palm plywood, and a plywood manufacturing method that can be manufactured at a low cost without using a single veneer of a tree having relatively good quality as a face and a back are disclosed. Yes.

JP 2009-166342 A JP-A-10-8696 JP 2011-68015 A

As described above, Patent Document 1 and Patent Document 2 both use oil palm fibers obtained by defibrating empty fruit bunches of oil palm fruits, and do not directly use oil palm trunks. Absent. However, the trunk of the oil palm is 20 m or more in mature wood, and its utilization is desired because it is a volume ratio occupying 90 to 95% of the whole.
Especially in Southeast Asia such as Malaysia, oil palm is cultivated for the production of palm oil, but the empty fruit bunch after palm oil collection contains a lot of fiber etc. Is used in various applications such as fiber boards. However, palm trunks that are harvested every year are not used effectively and are currently being disposed of.
Patent Document 3 discloses a process in which at least one outermost single plate is bonded to a palm single plate with a plurality of resin adhesives, and the surface of the palm single plate is a resin adhesive on the exposed palm fibers. Disclosed is a method for manufacturing a plywood, comprising: a step of polishing a surface that impregnates a surface; a step of applying a resin adhesive to the polished surface to infiltrate the resin adhesive into palm fibers; and a step of drying the resin adhesive. ing. However, it is unclear how to apply the resin adhesive to the oil palm veneer or to penetrate the exposed palm fiber, and a specific method for manufacturing plywood Is unknown.

However, when oil palm trunks are sawn, the moisture content is extremely high, so gray mold bacteria are prone to grow and corrode in natural drying, and even if commercialized, the commercial value may be lost, only the appearance is reduced. However, there was a problem of quality control because the mechanical strength was lowered or the quality was not constant.
Therefore, oil palm has been used as a heat insulating material in a part of wood (building material) that does not require mechanical strength, but it cannot be used as a building material.
In particular, in the cross section cut perpendicularly to the length direction of the oil palm, about 1/3 of the diameter across the center of the oil palm trunk WD is the outer diameter of the central area A and the central area A. The water content of each part on the basis of dry weight, assuming that the range of 1/3 to 1/6 of the diameter is the B region that is the inner region, and the range of 1/6 from the outer diameter of the A region is the outer C region. The area A is 502%, the area B is 313%, and the area C is 217%. The sugar concentration is 67.5 mg / ml in the A region, 76.6 mg / ml in the B region, and 55.4 mg / ml in the C region.

  In addition, the sugar concentration is high in the A region and the B region, but not high enough to prevent drying. However, when the sugar concentration increases due to the evaporation of moisture, a change in the moisture evaporation site of parenchyma is predicted. The inventors of the present invention sequentially dry from the lower moisture content when drying by hot plate heating or the like, and the higher moisture content is finally dried, so the relationship between the sugar concentration and the moisture content. However, it was far from the use of building materials because the drying condition varied in the progress of drying, mold bacteria propagated and partly darkened.

  Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide a wood drying apparatus and a drying method thereof in which mold bacteria do not propagate even in an oil palm material.

The wood drying apparatus according to the first aspect of the present invention is an oil palm material obtained by stripping a predetermined length of an oil palm trunk to a predetermined thickness in the circumferential direction or an oil palm trunk of a predetermined length to a predetermined thickness in the length direction. The heated oil palm material or other wood is heated with a hot plate from both sides of the oil palm material or the wood, and at the same time the hot plate is pressed against the oil palm material or the wood with a predetermined pressure by a press mechanism. Apply compressive force. At this time, the oil palm material or the wood and the hot plate are accommodated, the internal pressure thereof is set as a storage chamber independent of the atmospheric pressure, the air is exhausted from the storage chamber by a pump, and the humidity state is below a predetermined humidity. To maintain.
Here, the oil palm material is an oil palm material having a predetermined length of an oil palm trunk peeled to a predetermined thickness in the circumferential direction to make a plywood, or a predetermined length of an oil palm trunk having a predetermined thickness in the length direction. It is possible to obtain a single oil palm material. The same applies to other woods.
Moreover, the said hot plate heats the said oil palm material or the said timber from both surfaces. Therefore, it is used as two or more sheets.
The press mechanism applies a compressive force to the oil palm material or the wood with a predetermined pressure on the hot plate.
Furthermore, the said storage chamber should just hold | maintain the said oil palm material or the said wood, and the said heat | fever plate, and should just pressurize so that air may be exhausted from the said storage chamber, or it may reduce pressure. However, it may be arranged on either the intake side or the exhaust side. In any case, it is sufficient if the aeration in the storage room moves.
Furthermore, the above-described pump exhausts or sucks air from the storage chamber, and a special-purpose non-volumetric pump that does not require a special pump includes a centrifugal pump, an axial flow pump, and a mixed flow pump. Can be used. Moreover, a rotary pump, a reciprocating pump, etc. can be used as a positive displacement pump.

In the method for drying wood according to the invention of claim 2, an oil palm material obtained by stripping a predetermined length of an oil palm trunk to a predetermined thickness in the circumferential direction or an oil palm trunk of a predetermined length to a predetermined thickness in the length direction. A material forming step for forming sawn oil palm material or other wood, a hot plate heating step for heating the oil palm material or wood with a hot plate from both sides, and the heat for the oil palm material or wood. A compressive force applying step of applying a compressive force to the plate at a predetermined pressure by a press mechanism; and the interior of the storage chamber containing the oil palm material or the wood and the hot plate is separated from the atmospheric pressure, and air from the storage chamber A moisture discharge step of discharging the gas with a pump.
Here, the material forming step is an oil palm material in which a predetermined length of oil palm trunk is peeled to a predetermined thickness in the circumferential direction, or an oil obtained by sawing a predetermined length of oil palm trunk to a predetermined thickness in the length direction. It is a process of forming palm material or other wood.
Moreover, the said hot plate heating process is a process of heating the said oil palm material or the said wood with a hot plate from both surfaces.
And the said compression force provision process is a process of compressing the said hot plate with a predetermined pressure with a press mechanism with respect to the said oil palm material or the said timber.
Further, the moisture discharging step is a step of separating the internal pressure of the storage chamber containing the oil palm material or the wood and the hot plate from the atmospheric pressure, and exhausting or sucking air from the storage chamber with a pump.

According to a third aspect of the present invention, there is provided a wood drying apparatus comprising an oil palm material obtained by peeling a predetermined length of an oil palm trunk in a circumferential direction to a predetermined thickness or an oil palm trunk having a predetermined length in a predetermined thickness in the length direction. Lubricated oil palm material or other wood, a dielectric heating source that dielectrically heats the oil palm material or wood, and a room pressure that accommodates the oil palm material or wood and dielectrically heats with the dielectric heating source is increased. A housing chamber that separates from the atmospheric pressure and a pump that discharges air from the housing chamber are provided.
Here, the oil palm material or the wood is a predetermined length in the length direction of the oil palm material or the predetermined length of the oil palm trunk, which is a plywood by peeling a predetermined length of the oil palm trunk in a predetermined thickness in the circumferential direction. A single oil palm material or wood lumbered to a thickness can be used.
The dielectric heating source is for dielectric heating the oil palm material or the wood, and the oil palm material or the wood is placed as an object to be heated in an industrial high frequency AC electric field of several MHz to several hundred MHz. The temperature is raised by the action of the electromagnetic wave.
And the said storage chamber should just be what pressurizes or depressurizes so that the said oil palm material or the said wood may be accommodated, and may discharge | emit air from the said storage chamber. Instead, it may be disposed on either the intake side or the exhaust side. In any case, it is sufficient if the aeration in the storage room moves. Further, the pump exhausts or sucks air from the storage chamber.

According to a fourth aspect of the present invention, there is provided a method for drying wood, comprising: an oil palm material obtained by peeling a predetermined length of an oil palm trunk to a predetermined thickness in a circumferential direction thereof; or a predetermined length of an oil palm trunk having a predetermined thickness in a longitudinal direction thereof. A material forming step for forming a sawn oil palm material or other wood, a dielectric heating step for dielectrically heating the oil palm material or the wood with a dielectric heating source, and accommodating the oil palm material or the wood for the dielectric A chamber for dielectric heating with a heating source is separated from atmospheric pressure, and a moisture discharge step for discharging air from the storage chamber with a pump is provided.
Here, the material forming step is an oil palm material in which a predetermined length of oil palm trunk is peeled to a predetermined thickness in the circumferential direction, or an oil obtained by sawing a predetermined length of oil palm trunk to a predetermined thickness in the length direction. It is a process of forming palm material or the wood.
The dielectric heating step is a step in which the oil palm material or the wood is dielectrically heated with a dielectric heating source, and the oil palm material or the wood is covered in an industrial high frequency AC electric field of several MHz to several hundred MHz. It is placed as a heated object and heated by the action of the electromagnetic wave.
And the said moisture discharge process is the process of separating the indoor pressure which accommodates the said oil palm material or the said wood, and dielectrically heats with the said dielectric heating source from atmospheric pressure, and exhausts or inhales air from the said accommodation chamber with a pump. is there.

The moisture content after drying of the oil palm material or the wood of the wood drying apparatus according to the invention of claim 5 is in the range of 10% to 30%.
As a result of repeated experimental studies, the present inventors have generally found that when the water content is less than 10%, sufficient chemical change cannot be caused by the compacting process, and the surface is too dry and the compacting process is performed. A phenomenon in which the compressed portion returns to the original thickness when it gets wet later, that is, a so-called immobilization failure is likely to occur. On the other hand, when the moisture content exceeds 30%, it is difficult to dry uniformly to the inside, and an internal pressure that resists the pressing pressure is generated by the action of high-temperature and high-pressure steam contained in the wood in the consolidation process of compaction processing, After removing the pressure, it was found that damage such as cracking / breaking (puncture), deformation / bulging, and the like were likely to occur, and the present invention was completed based on this finding. More preferably, the moisture content of the oil palm material or the wood is in the range of 13% to 20%.

  The moisture content after drying of the oil palm material or the wood of the wood drying method according to the invention of claim 6 is in the range of 10% to 30%.

The heating temperature or dielectric heating temperature of the oil palm material or the heating plate for heating the wood of the wood drying apparatus according to the invention of claim 7 is lower than the fixing temperature of the oil palm material or the wood. The temperature within the range of 150 ° C. is the upper limit temperature.
Here, if the temperature of the oil palm material or the wood is 100 to 150 ° C., which is lower than the fixing temperature of 160 to 180 ° C., the water can be easily evaporated, and the heat of the oil palm itself is due to its own components. It is a material that has not undergone alteration and has undergone only drying before falling into stable plastic deformation.

The heating temperature or dielectric heating temperature of the oil palm material or the hot plate for heating the wood of the wood drying method according to the invention of claim 8 is lower than the fixing temperature of the oil palm material or the wood. The temperature within the range of 150 ° C. is the upper limit temperature.
Here, if it is the temperature of 100-150 degreeC lower than the immobilization temperature of oil palm material 160-180 degreeC, the evaporation of a water | moisture content will be easy, and the oil palm itself will change in quality by the self component with the heat | fever. This is a material that has been dried only before falling into stable plastic deformation.

The wood drying apparatus according to claim 1 is an oil palm material obtained by peeling a predetermined length of an oil palm trunk to a predetermined thickness in the circumferential direction, or an oil obtained by sawing a predetermined length of an oil palm trunk to a predetermined thickness in the length direction. A heat plate that heats palm material or other wood from both sides, and the oil palm material or wood and the heat plate are accommodated in a storage chamber, and the internal pressure is controlled separately from atmospheric pressure, and a press mechanism is used. Then, the hot plate is compressed with a predetermined pressure against the oil palm material or the wood.
Therefore, since the oil palm material or the wood is heated by a hot plate and the water vapor is released from the storage chamber through a pump, the water vapor generated by heating and the water generated by deaeration as needed are generated. It is discharged and the drying efficiency can be increased. Further, since the oil palm material or the wood is heated and pressurized by the hot plate, the heat of the hot plate reaches the core of the oil palm material or the wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material or the wood that does not affect the processing after drought can be prepared.

The method for drying wood according to claim 2 is an oil palm material obtained by peeling an oil palm trunk having a predetermined length in the circumferential direction to a predetermined thickness, or an oil obtained by sawing an oil palm trunk having a predetermined length in the longitudinal direction to a predetermined thickness. Palm material or other wood is formed, the oil palm material or the wood is heated with a hot plate from both sides, and the hot plate is pressed against the oil palm material or the wood with a predetermined pressure by a press mechanism. And the internal pressure of the storage chamber containing the oil palm material or the wood and the hot plate is controlled separately from the atmospheric pressure, and air is discharged from the storage chamber by a pump.
Therefore, since the oil palm material or the wood is heated by a hot plate and the water vapor is released from the storage chamber through a pump, the water vapor generated by heating and the water generated by deaeration as needed are generated. It is discharged and the drying efficiency can be increased. Further, since the oil palm material or the wood is heated and pressurized by the hot plate, the heat of the hot plate reaches the core of the oil palm material or the wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material or the wood that does not affect the processing after drought can be prepared.

The wood drying apparatus according to claim 3 is an oil palm material obtained by peeling a predetermined length of an oil palm trunk to a predetermined thickness in the circumferential direction, or an oil produced by sawing a predetermined length of an oil palm trunk to a predetermined thickness in the length direction. A dielectric heating source that dielectrically heats palm material or other wood, and a storage chamber that controls the internal pressure of the oil palm material or wood that is dielectrically heated by the dielectric heating source separately from atmospheric pressure Then, air is discharged from the storage chamber.
Therefore, the oil palm material or the wood is heated by dielectric heating, and the water vapor is discharged from the storage chamber through the pump, so that the water vapor generated by the heating and the water generated by deaeration as needed are generated. It is discharged and the drying efficiency can be increased. Further, since the oil palm material or the wood is heated and pressurized by dielectric heating, the heat of the dielectric heating reaches the core of the oil palm material or the wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material or the wood that does not affect the processing after drought can be prepared.

According to a fourth aspect of the present invention, there is provided an oil palm material obtained by peeling a predetermined length of an oil palm trunk to a predetermined thickness in the circumferential direction, or an oil obtained by sawing a predetermined length of an oil palm trunk to a predetermined thickness in the length direction. Palm oil or wood is formed, the oil palm material or the wood is dielectrically heated by a dielectric heating source, the oil palm material or the wood is accommodated, and the internal pressure of the accommodation chamber that is dielectrically heated by the dielectric heating source is increased. It is controlled separately from the atmospheric pressure and discharged by a pump.
Therefore, the oil palm material or the wood is heated by dielectric heating, and the water vapor is discharged from the storage chamber through the pump, so that the water vapor generated by the heating and the water generated by deaeration as needed are generated. It is discharged and the drying efficiency can be increased. Further, since the oil palm material or the wood is heated and pressurized by dielectric heating, the heat of the dielectric heating reaches the core of the oil palm material or the wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material or the wood that does not affect the processing after drought can be prepared.

  The wood drying apparatus according to claim 5 has a moisture content within a range of 10% to 30% after drying of the oil palm material or the wood, and therefore the effect according to claim 1 or claim 3. In addition, cracks, deformation, swelling, rupture and the like are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, it is suitable also for joining with other board | plate materials, such as a lauan board, a Chinese board, and a coniferous board, when it is a dry state in the range whose moisture content is 10%-30%.

  Since the drying method of the wood of Claim 6 makes the moisture content after drying of the said oil palm material or the said wood within the range of 10%-30%, The effect of Claim 2 or Claim 4 In addition, cracks, deformation, swelling, rupture and the like are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, it is suitable also for joining with other board | plate materials, such as a lauan board, a Chinese board, and a coniferous board, when it is a dry state in the range whose moisture content is 10%-30%.

  The heating temperature of the oil palm material or the hot plate for heating the wood of the wood drying apparatus according to the invention of claim 7 is in a range of 100 to 150 ° C. lower than the fixing temperature of the oil palm material or the wood. In addition to the effect of claim 1 or 3, even if heat is used during drying, the oil palm itself or the wood is its own component. Thus, the material is not dried or deteriorated, and is not yet in a stable plastic deformation state, so that the material is dried only.

  The heating temperature of the hot platen for heating the oil palm material of the wood drying method according to the invention of claim 8 is a temperature within a range of 100 to 150 ° C. lower than the fixing temperature of the oil palm material or the wood. In addition to the effect of claim 2 or claim 4, even if heat is used during drying, the oil palm itself or wood is cured by its own components by its own components. Therefore, it is a material that has only been dried since it is before falling into stable plastic deformation.

FIG. 1 is an explanatory diagram of a production process of a rotary lace material in the wood drying method of Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram in the case of producing an oil palm material from an oil palm trunk in the wood drying method according to the first embodiment of the present invention (a), an explanatory diagram (b) showing the state of fibers of the oil palm trunk, and an oil It is explanatory drawing (c) of the oil palm board lumbered from the palm trunk. FIG. 3 is an explanatory diagram of the principle of the wood drying method according to Embodiment 1 of the present invention. FIG. 4 is a configuration explanatory view showing the wood drying apparatus according to the first embodiment of the present invention. FIG. 5 is an explanatory diagram showing a schematic operation of the wood drying apparatus according to the first embodiment of the present invention. FIG. 6 is a flowchart illustrating the wood drying method according to the first embodiment of the present invention. FIG. 7 is a configuration explanatory view showing a wood drying apparatus according to Embodiment 2 of the present invention. FIG. 8 is a flowchart for explaining the order of the wood drying method according to the second embodiment of the present invention. FIG. 9 is an explanatory view showing a combined state (a), a laminated state (b), and a compressed state (c) of the laminated plywood after drying according to Embodiment 1 of the present invention. FIG. 10 is a cross-sectional view showing a schematic configuration of the compacted material manufacturing apparatus after drying according to the first embodiment of the present invention. FIG. 11 is an explanatory diagram for producing the laminated plywood after drying according to the first embodiment of the present invention. (A) is an explanatory diagram for supplying a multilayer material before pressurization as a raw material, and (b) is a heat compression start. (C) is an explanatory diagram according to a sealed heating compression start state, (d) is an explanatory diagram of a vapor pressure control process according to a sealed heating compression state, (e) is an explanatory diagram according to a sealed cooling state, (f) is It is explanatory drawing of taking-out of the compacted wood (consolidation processing material). FIG. 12 is an explanatory view of a frame used in the method for manufacturing a laminated plywood after drying according to Embodiment 1 of the present invention, and is a perspective view (a) and a sectional view (b) taken along a cutting line AA. FIG. 13 is a flowchart for explaining the order of the method for manufacturing the laminated plywood after drying according to the first embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the embodiments, the same symbols and the same reference numerals in the drawings are the same or corresponding functional parts, and therefore, redundant description thereof is omitted here.

  Although embodiments of the present invention will be described, general wood, for example, wood grain of cedar, cedar, rice bran, camellia leaf, rice cedar, pine pine, red pine, chestnut, chestnut, straw, wood, cherry, wood Compared to the material, the oil palm has a water content of A region, B region, and C region at the center of the oil palm trunk WD as described above. Since the region is very high at 217% and the sugar concentration is high, the material is difficult to dry. Since what can be implemented with oil palm can also be used with general wood, this embodiment also includes general wood.

  First, when the oil palm trunk WD used in Embodiment 1 of the present invention is cut so that the wood grain and the grid are made, as shown in FIG. It becomes the surface where the tube bundle) is arranged. That is, there are no annual rings like Japanese timber and cedar, and vascular bundle fibers of 0.2 to 1.0 mm extend in the length direction of the oil palm trunk WD, like cypresses. The density of vascular bundles varies depending on the position from the center.

The components of oil palm trunk WD are slightly different depending on the place of production, but the difference is slight, generally 30.6% by weight of cellulose, 33.2% by weight of hemicellulose, lignin (total lignin 28.5% by weight = Klarson lignin 24.7% by weight + acid-soluble lignin (3.8% by weight), extracted component 3.6% by weight, ash content 4.1% by weight, Characterization in Chemical Composition of the Oil Palm (Elaeis guineensis) (Journal of the Japan Institute of Energy, 87, 383-388 (2008)).
Visible fibers of 0.2 to 1.0 mm, that is, between the vascular bundle, are united by resin components such as lignin, saccharides such as cellulose and hemicellulose, and a small number of pores.

The formation of the oil palm material W constituting the laminated plywood according to the first embodiment will be described with reference to FIG.
The oil palm material W cuts a single trunk that has grown for more than 20 years as an oil palm trunk WD of a predetermined length, and sets it in a device called a rotary race that peels in the circumferential direction similar to wig removal of a radish. . Then, the oil palm trunk WD is rotated to perform circumferential stripping with the blade CT. This is a case where a plurality of oil palm materials W (specially, the number of oil palm materials W is not intended by peeling off a predetermined length of the oil palm trunk WD from the outer periphery to a predetermined thickness with a rotary race while rotating in the circumferential direction. Is simply a material forming step formed on the oil palm material W), and the oil palm material W is obtained by this material forming step.

As shown in FIG. 1, the center of the oil palm trunk WD is rotated so as to be an axis, and a continuous plate UWD is formed by applying a blade CT having a predetermined width to the outer peripheral side thereof. The oil palm material W having a predetermined area and a predetermined thickness is produced by cutting the sheet into a predetermined length and drying it.
Oil palm leaves, empty fruit bunches, roots, etc., excluding the oil palm trunk WD, are cut into chips and treated by an organic waste fermentation treatment method in which they are composted (composted) by aerobic bacteria treatment. In particular, empty fruit bunches may be subjected to other practical treatments. Further, it may be finely crushed, extracted with components such as cellulose, hemicellulose, lignin, etc., and used for joining assistance.

  Normally, when the continuous plate UWD is peeled off, the natural drying is started. However, artificially forced drying is performed after cutting the number of plate members of a unit for forming a predetermined laminated plywood PW. In general, since cutting is performed by a flow operation, it is desirable to start drying at the time when the continuous plate UWD is formed from the oil palm trunk WD from the viewpoint of securing the drying time. However, when the laminated plywood PW is prepared, it is dried immediately after the oil palm material W having a predetermined area and a predetermined thickness of the plywood is cut so as to be superimposed on the pre-pressing multilayer material NW shown in FIG. The process is being performed.

  In particular, when the continuous plate UWD is formed from the oil palm trunk WD, and the oil palm material W is cut therefrom, and drying is started immediately thereafter, it is desirable because chips at the end of the oil palm material W are difficult to be produced. If it is after the time when the continuous board UWD was formed from the oil palm trunk WD, there is no big difference. In any case, the process of drying these oil palm materials W requires a drying process regardless of forced drying or natural drying.

In the present embodiment, the number of oil palm materials W is not limited. However, in Embodiment 1, four oil palm materials W having a predetermined area and a predetermined thickness are stacked and added. A case where the unstressed multilayer material NW is used will be described.
In this way, the oil palm material W having a predetermined area, a predetermined number of predetermined thicknesses, a predetermined area, and a predetermined thickness is cut and separated, and is between the hot plates N1, ..., N5 of the wood drying apparatus 100. Oil palm materials W1,.

  However, in the above embodiment, the oil palm materials W1,..., W4 are made of plywood, so that the thickness of one oil palm material W is generally about 10 to 30 mm. In particular, in the case of the thin oil palm material W, it seems that it can respond to natural drying. However, the oil palm trunk WD has very high moisture near the core at the center thereof, and if it is simple natural drying, corrosion due to growth of mold bacteria is fast, and a large area may be corroded at the time of drying.

For example, FIG. 2 illustrates an oil palm material W produced from a predetermined length of oil palm trunk WD to a predetermined width, thickness, and length shown in FIG.
As described above, even if the oil palm trunk WD is cut so as to obtain a grid and a plate like the lumber lumber, there is no annual ring as shown in FIG. 2 (c), and as shown in FIG. 2 (b). Since only a bundle of fibers is formed in the length direction of the oil palm trunk WD, it can be cut out as shown in FIG. 2 (a) as a grid-like lumber plate as shown in FIG. 2 (a). Oil palm material W (W1,... W4, X1,... X4).
However, in order to obtain thick wood such as pillars, planks, wood decks, floor pillars, floor boards, etc. having a predetermined size from the oil palm trunk WD having a predetermined length, natural drying cannot cope with the growth rate of mold bacteria.

Therefore, the inventors have created a wood drying apparatus 100 shown in FIGS.
Drying device 100 of this timber, n pieces of hot plates N1 set to the required number of stages, ..., Nn and, valve 53 _-1 therein guide the water vapor pressure at a predetermined temperature, ..., 53 _{- n} and supply pipes 54 _-1 ,..., 54 _-n , and a valve 51 for guiding the vapor pressure to the valves 53 _{-1 ,.} , valve 53 _-1, ..., are provided with a pressure gauge P for measuring the vapor pressure of the input 53 _-n. Note that the temperature of the supply pipes 54 _-1 ,..., 54 _-n can be arbitrarily set according to the opening of the individual valves 53 _{-1 ,.}

Hot plate N1, ···, Nn (N1, ···, N4) , the supply line 54 _-1, ..., meandering shaped heating conduit steam is supplied from the 54 _-n 56 ₋₁ ,..., 56 _-n are embedded, and the other ends of the heating pipes 56 ₋₁ ,..., 56 _−n are drain pipes 58 ₋₁ ,. , 58 _-n through the valve 59 to the return line 60 and reheated by a heat source such as a boiler. Again, valve 51 and supply lines 53 _-1, ..., 53 _-5 predetermined steam through the heat plate N1, ..., circulated while increasing the temperature of Nn, hot plate N1, · .., Nn is raised to a predetermined temperature.

In the opposed hot plates N1,..., N5, the oil palm materials W1,..., Wn (W1,. · pit 57 _-2 accommodating the W4), · · ·, 57 are _-n is formed, oil palm material W1, · · ·, Wn is limiting the movement in the horizontal direction at the time of compression. In addition, auxiliary plates 55 _-1 ,..., 55 _-n are formed in the hot plates N1,. The heat plates N1,..., Nn are formed so as to be efficiently transmitted.

Therefore, the oil palm materials W1,..., Wn are inserted between the hot plates N1,..., Nn of the wood drying apparatus 100, and the two sides of the oil palm materials W1,. Nipping while heating with plates N1,..., Nn.
Specifically, a wood drying apparatus 100 having hot plates N1,. A steam pressure of a predetermined water vapor pressure is supplied to the hot plates N1,..., Nn via the valve 51 and the supply pipes 53 _{−1 ,.}

Further, the supplied vapor pressure is collected by the discharge pipes 58 _-1 ,..., 58 _-n , led to the return pipe 60 through the valve 59, and reheated by a heat source such as a boiler (not shown). . Again, valve 51 and supply lines 53 _-1, ..., 53 a predetermined steam temperature through _-n A heat plate is formed of metal such as stainless steel or iron N1, ..., temperature of Nn , The water vapor pressure circulates and raises the hot plates N1, ..., Nn to a predetermined temperature.

Usually, the temperature of the hot plates N1,..., Nn formed of a metal such as stainless steel or iron is heated at 100 to 150 ° C. In particular, it is desirable to perform the treatment at a temperature within the range of 110 to 140 ° C. Further, after heating, the temperature is gradually decreased, but the temperature is not rapidly decreased by using cooling water or the like from the outside. Further, in order to transmit the temperature of the hot plates N1,..., Nn to the oil palm materials W1,. The pressure is applied to the oil palm materials W1,..., Wn sandwiched between them, and at the same time, the temperature of the oil palm materials W1,.
As a result, the temperature of the hot plates N1,..., Nn is transmitted to the oil palm materials W1,..., Wn with high efficiency, and the oil palm material W1 is caused by the temperature rise of the oil palm materials W1,. ,..., Wn can be discharged as water vapor.

When heating the oil palm materials W1,..., Wn for a predetermined time and removing the water-containing components, the valve 51 is closed, the supply of water vapor is turned off, and the heat plates N1,.・ Reducing the compressive force of Nn. During this time, the temperature of the oil palm materials W1,..., Wn gradually decreases due to the residual heat of the hot plates N1,..., Nn, but there is no requirement to rapidly decrease to room temperature. Moreover, although the valve | bulb 51 demonstrated in the example closed at a stretch, you may close gradually over 5 to 30 minutes. In this way, the temperature of the hot plates N1,..., Nn is heated at 100 to 150 ° C., and the time until the temperature falls from the temperature in the storage chamber 50 to the environmental temperature is moderated. Due to the components of the oil palm itself, such as the progress of crystallization, it is prevented from being altered or falling into stable plastic deformation. Thereby, use of the dried oil palm material W is enabled.
A press mechanism for applying a compression force to the oil palm material W at a predetermined pressure with a hot plate N1,..., Nn is not shown because it is known, but the hot plate N1,. ... A given compressive force is applied to the entire Nn. The press mechanism step of applying a predetermined compressive force to the oil palm material W by the hot plates N1,..., Nn corresponds to a compressive force applying step.

Next, operations of the limited hot plate N1, hot plate N2, and oil palm material W1 of the wood drying apparatus 100 will be described.
As shown in FIG. 5A, the relative interval is increased so that the interval between the hot plates N1,. At this time, no steam pressure is supplied to the heating pipelines 56 _-1 ,..., 56 _-n .
Oil palm material W1, · · ·, Wn is the hot plate N1, · · ·, pits 57 _-2 formed Nn, · · ·, are moved to 57 _-n.

Here, as in FIG. 5 (b), oil palm material W1, · · ·, a Wn, hot plate N2, · · ·, pits 57 _-2 formed Nn, · · ·, to 57 _-n The oil palm materials W1,..., Wn are prevented from moving in the surface direction and receive pressure from the vertical direction with respect to the hot plates N1,. In this state, vapor pressure is supplied to the heating pipes 56 ₋₁ ,..., 56 _-n , and heating of the hot plates N 1,.

Next, as shown in FIG. 5 (c), the oil palm material W1, · · ·, a Wn, hot plate N2, · · ·, pits 57 _-2 formed Nn, · · ·, and 57 _-n , Nn between the auxiliary spaces 55 _-1 , ..., 55 _-n-1 formed in the hot plates N1, ..., Nn, and heating pipes 56 _-1 , ..., 56 _-n The temperature of the hot plates N1,..., Nn is increased by the steam pressure of the oil palm materials W1,..., Wn sandwiched between the hot plates N1,. The temperature of the oil palm materials W1,..., Wn is increased by applying force and bonding them closely. At this time, the heated water vapor is discharged from a gap (groove not shown) between the hot plates N1,.

Hot plate N1, ..., the gap between Nn each other, so that the heated water vapor is discharged, a pit 57 _-2, ..., a groove around the 57 _-n are being formed, whereby The water vapor pressure between the closed pits 57 _-2 , ..., 57 _-n and the auxiliary spaces 55 _-1 , ..., 55 _-n-1 is prevented from increasing.
Furthermore, those oil palm material W1, · · ·, the area of Wn wide, when drying what thickness, pits 57 _-2, · · ·, 0.5 to 3 mm about the bottom surface of 57 _-n Form the exhaust path by forming a groove having a width or forming a groove having a width of about 0.5 to 3 mm on the upper surface of the auxiliary space 55 _-1 ,..., 55 _-n-1. become.

  The entire wood drying apparatus 100 is accommodated in a storage chamber 50 which is a closed space such as a housing formed of an iron plate, an aluminum plate or the like. In the storage chamber 50, an oil palm material W obtained by peeling a predetermined length of an oil palm trunk WD in a predetermined thickness in the circumferential direction or an oil palm made of a predetermined length of an oil palm trunk WD in a predetermined thickness in the length direction The heating plates N1,..., Nn for heating the palm material W from both sides, and the arrows in FIG. A press mechanism (not shown) that compresses in the direction of the compressive force shown is accommodated.

A pump 49 that controls the internal pressure of the storage chamber 50 separately from the atmospheric pressure is connected to the air inlet side, and air is supplied to the storage chamber 50. The air inside the storage chamber 50 can be exhausted to the exhaust port side of the storage chamber 50. Here, the pump 49 that controls the internal pressure of the storage chamber 50 separately from the atmospheric pressure may supply dry air to the storage chamber 50, or exhausts high-humidity air from the storage chamber 50. It may be a thing.
Here, the accommodation chamber 50 accommodates the oil palm material W and the hot plates N1,..., Nn, and separates the accommodation internal pressure from the atmospheric pressure. However, the entire press mechanism (not shown) may be accommodated in the accommodation chamber 50 or a part thereof may be accommodated. Moreover, you may accommodate only output shafts, such as a hydraulic piston.

The wood drying apparatus 100 according to the first embodiment operates as shown in FIG.
First, in step S1, the hot plates N1,..., Nn are opened to the maximum, and the oil palm materials W1,. When the oil palm materials W1,..., Wn are arranged in step S2, and the arrangement is confirmed in step S3, the valve 51 is opened in step S4 and heating of the hot plates N1,. In step S5, the pump 49 is driven and the discharge of moisture is started.

  Next, in step S6, the compression force for sandwiching the oil palm materials W1,..., Wn between the hot plates N1,. This compressive force is applied in accordance with the temperature by the routine of step S6 and step S7 until the temperature of the hot plates N1,..., Nn becomes maximum in step S7. When the temperature of the hot plates N1,..., Nn reaches a maximum in step S7, the temperature is maintained for a predetermined time in step S8 to promote drying. In the routine of step S6 and step S7, the compression force is increased in accordance with the time axis. However, when the present invention is implemented, the temperature may be controlled according to the pressure, or according to the elapsed time. The pressure may be changed.

  When the maintenance of the predetermined time is finished in step S8, the valve 51 is closed in step S9, and the supply of water vapor pressure is stopped. However, the heat plates N1,..., Nn maintain their temperatures due to residual heat. In step S10, the compression force between the hot plates N1,..., Nn by the press mechanism is reduced, and in step S11, it is determined whether the temperature of the hot plates N1,. Until then, the processing of the routines of step S10 and step S11 is repeatedly executed, and when it is confirmed in step S11 that the temperature of the hot plates N1,..., Nn has become equal to or lower than the predetermined temperature, in step S12 The hot plates N1,..., Nn are opened by the press mechanism, the pump 49 is stopped in step S13, and the oil palm materials W1,..., Wn are discharged in step S14. The operation of the drying apparatus 100 is finished. Here, the process of the routine of step S10 and step S11 adjusts the compression force between the hot plates N1,..., Nn by the press mechanism according to the temperature of the hot plates N1,. However, when the present invention is carried out, the valve 51 may be closed and then opened at a stroke after a predetermined time has elapsed.

Here, as shown in FIGS. 1 and 2, the material forming step includes an oil palm material W obtained by peeling a predetermined length of oil palm trunk WD at a predetermined thickness in the circumferential direction or an oil palm trunk WD having a predetermined length. This is a step of obtaining the oil palm material W lumbered to a predetermined thickness in the vertical direction.
The hot plate heating step is a step of heating with hot plates N1,..., Nn comprising steps S6 to S8.
In the first embodiment, it is assumed that the oil palm material W has a plate-like shape, but drying can be performed in the same manner even in a columnar shape.

And a compressive force provision process is a process which consists of step S6 and step S7 which assign | provide the compressive force by predetermined | prescribed pressure with respect to the oil palm material W with hot plate N1, ..., Nn.
Further, the moisture discharge process means a process of removing the humidity between step S5 to step S13 in the process of exhausting or sucking air from the storage chamber 50 by the pump 49.

  Assuming that the wood drying apparatus 100 according to the first embodiment can also be applied to general wood, an oil palm material W or a predetermined length obtained by peeling a predetermined length of an oil palm trunk WD to a predetermined thickness in the circumferential direction thereof. , Nn, and the oil palm material W or the wood, which heats the oil palm material W or other wood obtained by sawing the oil palm trunk WD to a predetermined thickness in the lengthwise direction from both sides The hot platen N1,..., Nn is compressed with a predetermined pressure, and the oil palm material W or the wood and the hot plates N1,. A housing chamber 50 that is controlled separately from the atmospheric pressure and a pump 49 that exhausts or sucks air from the housing chamber 50 are provided.

  Therefore, the oil palm material W is heated by the hot plates N1,..., Nn, and the water vapor is discharged from the storage chamber 50 through the pump 49, so that the water vapor generated by the heating is removed as necessary. Moisture generated by the air is discharged, and the drying efficiency can be increased. Further, since the oil palm material W or the wood is heated and pressed by the hot plates N1,..., Nn, the heat of the hot plates N1,. Arrives and the whole can be dried quickly. Therefore, the oil palm material W or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material W or the wood that does not affect the processing after drought can be prepared.

  Moreover, the drying method of the wood of this Embodiment 1 is the oil palm material W which peeled the oil palm trunk WD of predetermined length in the circumferential direction to predetermined thickness, or the oil palm trunk WD of predetermined length in the length direction. A material forming step for forming oil palm material W or other wood lumbered to a predetermined thickness, and a hot plate heating step for heating oil palm material W or the wood with hot plates N1, ..., Nn from both sides; A compressive force applying step of applying a compressive force to the oil palm material W or the wood by a press mechanism at a predetermined pressure to the heat plates N1,..., Nn, and the oil palm material W or the wood and the heat plate N1, ..., a moisture discharge step of separating the internal pressure of the storage chamber 50 storing Nn from the atmospheric pressure and exhausting or sucking air from the storage chamber 50 by the pump 49.

  Therefore, since the oil palm material W or the wood is heated by the hot plates N1,..., Nn and the water vapor is discharged from the storage chamber 50 through the pump 49, the water vapor generated by the heating is necessary. Accordingly, moisture generated by deaeration is discharged, and the drying efficiency can be increased. Further, since the oil palm material W or the wood is heated and pressed by the hot plates N1,..., Nn, the heat of the hot plates N1,. Arrives and the whole can be dried quickly. Therefore, the oil palm material W or the wood can be dried to the extent that mold bacteria do not propagate, and the oil palm material W or the wood that does not affect the processing after drought can be prepared.

In the first embodiment, the case where the hot plates N1,..., Nn for supplying the vapor pressure are used as the wood drying apparatus 100 has been described. However, when implementing this invention, it can implement also as the heat plate N1, ..., Nn which embedded heat sources, such as a heater. However, considering the accuracy of temperature control and the influence on the oil palm material W, it is a preferable device.
In addition, dielectric heating using microwaves can be performed as in the case of the wood drying apparatus 200.

The wood drying apparatus 200 using the microwave according to the second embodiment is configured as shown in FIG.
The dielectric heating furnace 73 is a housing made of a material such as refractory brick, which is very small, such as tan δ, that is, a good dielectric material and can withstand temperature. Is forming. The shield chamber 72 is formed of a copper plate and an iron plate. A storage chamber 70 is constituted by the shield chamber 72 and the dielectric heating furnace 73.
In the dielectric heating furnace 73, a pedestal 74 made of a good dielectric material for determining the position of the object to be heated and a spacer 76 for obtaining a thermal insulation effect are arranged.

On the spacer 76, the table plate 75 _-1 formed by ceramic plate to withstand more than a predetermined load and high temperature, ..., with respect to 75 _-n, each table plate 75 _-1, ..., 75 _-n Oil palm materials W1 _-1 ,..., Wn _-1 , oil palm materials W1 _-2 , ..., Wn- ₂ , oil palm materials W1 _-3 , ..., Wn _-3 , oil palm The materials W1 _-4 ,..., Wn _-4 are placed so that the oil palm material W is not deformed by drying under a predetermined load. Further, with respect to oil palm material W, also shut off the microwaves, the residual heat of the oil palm material W so far, i.e., the table plate 75 _-1, ..., the residual heat of 75 _-n, oil palm material The temperature of W is gradually lowered.

As the microwave supplied into the dielectric heating furnace 73, a dielectric heating source 71 having a frequency of 2.4 GHz and an output of 10 kW was used to vaporize and exhaust water molecules contained in the oil palm material W. As a result, the water vapor generated in the dielectric heating furnace 73 was exhausted from the discharge pipe 78 by the air supplied from the dry air supply pipe 77.
Therefore, oil palm materials W1-1,..., Wn-1, oil palm materials W1-2,. , Wn-2, oil palm materials W1-3, ..., Wn-3, oil palm materials W1-4, ..., Wn-4 are placed, and the oil palm material W is not deformed by a predetermined load. When heated in this manner, only the moisture of the oil palm material W is vaporized, and the oil palm material W can be dried.
In the second embodiment, the case where the pedestal 74 is fixed has been described. Usually, however, the pedestal 74 is rotated so that the microwave does not heat only a specific position.

Each of the table plates 75-1,..., 75-n has been described on the premise of weighting. However, when the present invention is carried out, a powder of a conductor is put into a microwave. In response, it can generate heat. Indirectly, the respective table plates 75-1,..., 75-n are heated to obtain oil palm materials W1-1,..., Wn-1, oil palm materials W1-2,. 2, oil palm materials W1-3, ..., Wn-3, oil palm materials W1-4, ..., Wn-4 can be indirectly heated.
However, oil palm materials W1-1,..., Wn-1, oil palm materials W1-2,..., Wn-2, oil palm materials W1-3,. .., Wn-3, oil palm materials W1-4,...

The wood drying apparatus 200 according to the second embodiment operates as shown in FIG.
First, in step S21, the oil palm materials W1,..., Wn are carried in and arranged, and until the completion is confirmed in step S22. Normally, completion is detected by locking a door (not shown) of the storage chamber 70. When the completion is confirmed in step S22, the pump 49 is driven in step S23, and the discharge of moisture is started.
Next, in step S24, the dielectric heating source 71 is driven, and a microwave output is output into the storage chamber 70. In step S25, it is determined whether or not the dielectric heating is continued for a predetermined time. Stop microwave output. Further, in step S27, it is determined whether or not a predetermined time has elapsed as heating by residual heat. In step S28, it is determined whether the temperature of the oil palm materials W1,..., Wn has decreased to a predetermined temperature. When the temperature has decreased to the predetermined temperature, the pump 49 is stopped in step S29. In step S30, the oil palm materials W1,..., Wn are carried out, and the operation of the wood drying apparatus 200 according to the second embodiment is terminated.

Here, as shown in FIGS. 1 and 2, the material forming step includes an oil palm material W obtained by peeling a predetermined length of oil palm trunk WD at a predetermined thickness in the circumferential direction or an oil palm trunk WD having a predetermined length. This is a step of obtaining the oil palm material W lumbered to a predetermined thickness in the vertical direction.
The dielectric heating process is a process in which the oil palm material composed of steps S24 to S25 is dielectrically heated by the dielectric heating source 71.
The moisture discharge process means a process of removing the humidity between step S23 to step S29 in the process of exhausting or sucking air from the storage chamber 70 with the pump 49.
In the second embodiment, the oil palm material W has been described on the assumption that it is a plate material. However, even a columnar material can be dried in the same manner. The drying rate can be increased by heating from the core of the oil palm material W.

  The wood drying apparatus 200 according to the second embodiment has an oil palm material W obtained by peeling a predetermined length of an oil palm trunk WD in a predetermined thickness in the circumferential direction or an oil palm trunk WD having a predetermined length in a predetermined length direction. A dielectric heating source 71 that dielectrically heats the oil palm material W or other wood that is sawn to a thickness of, and an indoor pressure that accommodates the oil palm material W or the wood and dielectrically heats it with the dielectric heating source 71 is separated from the atmospheric pressure. And a pump 49 for exhausting or sucking air from the storage chamber 70.

Therefore, the oil palm material W or the wood is heated by dielectric heating, and the water vapor is discharged from the storage chamber 70 through the pump 49. Therefore, water vapor generated by the heating and moisture generated by deaeration as necessary. Is discharged and the drying efficiency can be increased. In addition, since the oil palm material W or wood is heated and pressurized by dielectric heating, the heat of dielectric heating reaches the core of the oil palm material W or wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material W or wood can be dried to such an extent that mold bacteria do not propagate, and the oil palm material W or wood that does not affect the processing after drought can be prepared.

  Further, in the method for drying wood according to the second embodiment, the oil palm material W or the oil palm trunk WD having a predetermined length is peeled in the length direction. A material forming step for forming oil palm material W or other wood lumbered to a predetermined thickness, a dielectric heating step for dielectric heating the oil palm material W or the wood with a dielectric heating source 71, and the oil palm material W or the wood. And a moisture discharge step of separating the pressure in the storage chamber 70 that is dielectrically heated by the dielectric heating source 71 from the atmospheric pressure, and exhausting or sucking air from the storage chamber 70 by the pump 49.

Therefore, the oil palm material W or the wood is heated by dielectric heating, and the water vapor is discharged from the storage chamber 70 through the pump 49. Therefore, water vapor generated by the heating and moisture generated by deaeration as necessary. Is discharged and the drying efficiency can be increased. In addition, since the oil palm material W or wood is heated and pressurized by dielectric heating, the heat of dielectric heating reaches the core of the oil palm material W or wood, and the entire drying can be performed rapidly.
Therefore, the oil palm material W or wood can be dried to such an extent that mold bacteria do not propagate, and the oil palm material W or wood that does not affect the processing after drought can be prepared.

9, four oil palm materials W1,..., Wn having a predetermined area and a predetermined thickness are cut and aligned with the stacked state of the multilayer material NW before pressurization as shown in FIG. I do. When this lamination is performed, in order to prevent the spread of the oil palm material W in the surface direction, the frame body 20 (see FIG. 12) for positioning each side of the four oil palm materials W1,. It is desirable to set holes 18 (see FIG. 10). For the sake of simplicity, FIGS. 10 and 11 will be described using the positioning hole 18 as an example.
The step of laminating a plurality of oil palm materials W or wood dried in the drying step of the wood drying device 100 or the wood drying device 200 in a predetermined state is referred to herein as an arrangement step.

Therefore, the consolidated laminated plywood PW shown in FIG. 9 (a) is obtained by applying a predetermined compressive force under a predetermined temperature condition to the laminated plywood NW shown in FIG. 9 (b). After compression, a predetermined time has elapsed, the temperature is lowered to a predetermined temperature, fixed, and then decompressed.
That is, a compression process is performed in which a compression force in a direction perpendicular to the surface of the oil palm material W is applied to the laminated oil palm materials W1,..., W4 heated by the heating process. After pressing at a temperature for a predetermined time, the laminated plywood PW is obtained through a fixing process in which the temperature supplied in the heating process is lowered and the compressed state is maintained.

  Here, the process of heating to raise the temperature of the laminated oil palm material W after the lamination process is referred to as a heating process, and the oil palm material W heated and laminated by the heating process is added to the oil palm material W. The step of applying a compressive force in the direction perpendicular to the surface of the material W is called a compression step. Then, after pressing for a predetermined time in the compression step, the temperature supplied in the heating step is lowered, and the step of cooling and fixing at normal temperature or slightly lower than that is fixed in a consolidated state. In this sense, it is called an immobilization process.

First, a procedure for manufacturing the laminated plastic processed wood according to the embodiment of the present invention will be described with reference to FIGS. 10 to 13.
As shown in the flowchart of FIG. 13, first, a predetermined length of the oil palm trunk WD is peeled to a predetermined thickness with a rotary race blade CT while being rotated in the circumferential direction to form a plurality of oil palm members W. In the material forming step of Step S40, the oil palm material W obtained by peeling the oil palm trunk WD having a predetermined length in the circumferential direction to a predetermined thickness or the oil palm trunk WD having a predetermined length is made into a predetermined thickness in the length direction. The oil palm material W was formed into a predetermined shape, and then dried and dried within the range of 10% to 30% of the moisture content by the wood drying device 100 or the wood drying device 200 in the drying process of step S41. Oil palm material W is obtained.

  Here, the drying method of the oil palm material W in the drying step includes artificial drying or natural drying (sun drying). As the artificial drying, for example, hot air is supplied to the oil palm material W using a dryer such as a steam dryer having a high-temperature steam as a heat source and a dehumidifier including a refrigerator for removing humidity. Examples include an external heating method for heating from the outside of the oil palm material W by spraying or heating and squeezing with a press board, an internal heating method for heating the oil palm material W from the inside by applying dielectric heating, As is well known, in general, natural drying is less expensive than artificial drying.

  However, when the oil palm material W is naturally dried, in particular, when the oil palm material W is thick, bacteria such as mold are prone to grow and corrode, and productivity and commercial value are impaired. This is because oil such as Lauan, which is commonly used for building materials, forms a secondary xylem composed of cell (dead cell) tissue that has stopped moving water and nutrients. This is because the stem WD is composed only of primary tissues of vascular bundles and parenchymal cells, and most cells centering on parenchymal cells are living cells to which water and nutrients are transferred, and the moisture content is extremely high. Furthermore, it was found that oil palm trunk WD (oil palm trunk) is rich in saccharides (eg, fructose, glucose, fructooligosaccharides, inositol, etc.). When the thickness of the oil palm material W obtained from the trunk of the palm is thick, bacteria such as mold are proliferated and corroded easily in natural drying, and productivity and commercial value are impaired.

Therefore, according to the experiments by the present inventors, by setting the thickness of the oil palm material W obtained from the oil palm trunk WD to a range of 10 mm to 20 mm or less, commercial value and productivity due to bacteria such as mold even in natural drying It has been confirmed that the cost can be reduced without incurring a decrease in the cost.
In addition, it was confirmed that the use of the wood drying apparatus 100 or the wood drying apparatus 200 can be made at low cost without causing a reduction in product value and productivity due to bacteria such as mold.

Furthermore, according to the experiments by the present inventors, when the thickness of the oil palm material W obtained from the oil palm trunk WD is less than 3 mm (when it is less than 0.9 to 1.1 after consolidation), the thickness Since it is thin, it is easy to cut when it is peeled off, and when it exceeds 20 mm, it is difficult to uniformly dry to the inside, so deformation and bulge are likely to occur after compaction processing, which will be described later, and the curved surface is repositioned in a straight line It has also been confirmed that cracks and the like are likely to occur.
For this reason, the oil palm material W having a thickness of 3 mm or more and 20 mm or less is peeled off from the oil palm trunk WD, and it can be dried at low cost without causing deterioration of the product value and productivity due to bacteria such as mold even by natural drying. Further, the cutting operation is easy, and the dimensional shape stability after the compacting process described later is high.
In the case of the wood drying apparatus 100, the thickness of the oil palm material W from the oil palm trunk WD is preferably in the range of 6 mm or more and 15 mm or less.
However, the wood drying apparatus 200 can process a thicker material than the wood drying apparatus 100.

  In addition, when the moisture content of the dried oil palm material W is less than 10% as a result of repeated experiments by the present inventors, the drying within the range of the moisture content of 10% to 30% will be described later. Insufficient chemical changes can be caused by the phenomenon that the surface is too dry and the compressed part returns to its original thickness when it becomes wet after compaction, so-called immobilization. On the other hand, when the moisture content exceeds 30%, it is difficult to dry uniformly to the inside, and it has been confirmed that damage such as cracks, rupture, deformation, swelling, etc. are likely to occur after consolidation. Therefore, the setting is made based on this. That is, it is desirable that the moisture content of the oil palm material W is substantially uniform over the entire thickness, and that the entire thickness is plastically processed with a substantially uniform compression rate, and the moisture content ranges from 10% to 30%. The inside is preferable. More preferably, the water content is in the range of 13% to 18%. In addition, a moisture content is measured using measuring instruments, such as a high frequency moisture content meter, for example.

Next, the arrangement | positioning process of step S42 which laminates | stacks the dried oil palm material W as needed is performed. That is, it is a process of laminating a plurality of the oil palm materials W dried in the drying process of Step S40 and Step S41 in a predetermined state as necessary. It becomes the multilayer material NW before pressurization by the arrangement | positioning process of this step S42. Although the outer diameters of all the pre-pressurized multilayer materials NW are the same, the oil palm materials W in the stacking direction are merely overlapped by their own weight.
Here, a plastically processed wood manufacturing apparatus 300 that performs consolidation of the pre-pressing multilayer material NW formed by laminating the oil palm material W will be described with reference to FIGS. 10 to 12.

  In FIG. 10, the compacted material manufacturing apparatus 300 for manufacturing the laminated plywood PW of the present embodiment mainly includes the internal space IS and the positioning holes 18 by the two divided structures of the upper press board 10A and the lower press board 10B. Are arranged on the peripheral portion 10a of the upper press plate 10A facing the peripheral portion 10b of the lower press plate 10B, and the position of the multilayer material NW before pressurization is determined and regulated on the lower press plate 10B. A positioning member 18 is formed, and the seal member 11 that seals the internal space IS and the positioning hole 18 within a predetermined range of vertical movement of the upper press board 10A, and the internal space IS and the positioning hole from the upper surface side of the upper press board 10A. 18, a pipe 12 having a pipe port 12 a for supplying steam into the internal space IS and the positioning hole 18, a valve V 4 on the upstream side thereof, and a lower plate The pipe 13 is connected to the internal space IS and the positioning hole 18 from the side surface of the panel 10B, and has a pipe port 13a for discharging water vapor from the internal space IS and the positioning hole 18, and the vapor pressure in the pipe 13 is detected. Pressure gauge P2, a downstream valve V5, a drain pipe 14 connected to the valve V5, and the like.

  The press board 10 has a plane size that can place the entire specific surface perpendicular to the surface of the multilayer material NW before pressurization, that is, the entire surface to be compressed of the multilayer material NW before pressurization. The material is not particularly limited. For example, it is formed of a material such as stainless steel or aluminum so that the wood is not blackened due to iron ion contamination, or the contact surface with the multilayer material NW before pressurization is plated. Is given. Furthermore, the material of the seal member 11 that seals the internal space IS and the positioning hole 18 is not particularly limited, but usually, silicon rubber, silicon resin, etc. excellent in heat resistance and water resistance are used. .

  Further, in the upper press board 10A and the lower press board 10B of the press board 10, pipe lines 15 and 16 are formed for raising the temperature to a desired temperature by passing high-temperature steam. Pipes ST2 and ST3 branched from the steam supply side pipe ST1 and steam discharge side pipes ET1 and ET2 are connected to the paths 15 and 16, respectively. Further, in the middle of the steam supply side pipes ST1, ST2, ST3, valves V1, V2, V3 and a pressure gauge P1 for detecting the steam pressure in the pipe ST1 are arranged, and the steam discharge side pipes ET1, ET2 Is connected to the drain pipe 14 via a valve V6.

In addition, the boiler apparatus which supplies water vapor | steam to piping ST1, and the press raising / lowering apparatus containing the hydraulic mechanism for raising / lowering and pressurizing the upper press board 10A with respect to the lower press board 10B of the fixed side of the press board 10 are abbreviate | omitted. Has been.
In the first embodiment, the internal space IS formed by the upper press board 10A and the lower press board 10B of the press board 10 and the piping 12 connected to the valve V4 for heating the inside of the positioning hole 18 are used. Although water vapor is introduced, it is also possible to use high-frequency heating, microwave heating, or the like. In particular, for the high-frequency heating of wood, a method of heating from the center of wood at a high frequency slightly lower than that of microwave is preferable to dielectric overheating by microwave.

Further, on the press board 10, a cooling water supply side that cools to a desired temperature by passing low-temperature cooling water in place of water vapor through the pipes 15 and 16 formed in the upper press board 10A and the lower press board 10B. Pipes ST12 and ST13 branched from the pipe ST11 are connected to the pipes ST2 and ST3, respectively. Further, valves V11, V12, V13 are arranged in the middle of the pipes ST11, ST12, ST13 on the cooling water supply side. In addition, the cooling water supply apparatus which supplies cooling water to piping ST11 is abbreviate | omitted.
Of course, when the present invention is carried out, a compressive force is applied in a direction perpendicular to the surface of the five oil palm members W of the multilayer material NW before pressurization in the press-pressing direction of the press board 10. .

In manufacturing the laminated plywood PW from the pre-pressing multilayer material NW by the compacted material manufacturing apparatus 300 configured as described above, first, as shown in FIG. The upper press board 10A rises with respect to the lower press board 10B on the fixed side of the board 10, and a pre-pressing multilayer material NW that has been dried in advance to a predetermined condition is formed by the upper press board 10A and the lower press board 10B. It is placed in the internal space IS and the positioning hole 18.
Here, in the present embodiment, the pre-pressing multilayer material NW that is a raw material of the laminated plywood PW is formed in a predetermined dimension (thickness, width, length), and a total of four oil palms The surface side of the material W was opposed to the upper press board 10A and the lower press board 10B of the press board 10 and placed in the positioning hole 18 of the lower press board 10B.

Subsequently, as shown in FIG. 11 (b), the upper press platen 10A is lowered at a predetermined pressure with respect to the pre-pressing multilayer material NW placed on the positioning hole 18 of the fixed-side lower press platen 10B. Thus, it is brought into contact with the upper surface of the pre-pressurized multilayer material NW, that is, in the present embodiment, in the direction perpendicular to the surface of the oil palm material W. In step S43, timer control by the timer I is started.
Looking at the timer I in step S43, it is determined whether it is the heating timing in step S44, and it is determined whether it is the compression timing in step S44.
At the heating timing, steam at a predetermined temperature (for example, 110 to 180 [° C.]) is passed through the piping path 15 of the upper press panel 10A and the piping path 16 of the lower press panel 10B in step S46, and the internal space IS and the positioning hole 18 is maintained at a predetermined temperature (for example, 110 to 180 [° C.]). When it is determined at step S44 that it is not the heating timing, it is determined at step S45 whether it is the compression timing, and when it is the compression timing, the compression process is started at step S47.

That is, in step S47, the compression force of the upper press board 10A is set to a predetermined pressure (for example, 2 to 5 [MPa]) with respect to the lower press board 10B on the fixed side, and the multilayer material NW before pressurization is the upper press board. 10A and the lower press panel 10B are heated and compressed for a predetermined time (for example, 5 to 40 [min]). Also, in step S48, it is determined whether the heating / compression is completed, and the routine processing from step S43 to step S48 is performed until the end time is reached.
In order to prevent cracking, the compression force in step S48 is a temperature rise of the multilayer material NW before pressurization, that is, a temperature state inside the multilayer material NW before pressurization according to the elapsed time of the timer I in step S43,
It is desirable to gradually increase as the heating time elapses, and it is preferable to set the heating and compression time in consideration of the heating time.

  Further, as shown in FIG. 11 (c), when the peripheral portion 10a of the upper press panel 10A comes into contact with the peripheral portion 10b of the lower press panel 10B, the sealing member 11 disposed on the peripheral portion 10a of the upper press panel 10A. The internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B are hermetically sealed. Then, with the internal space IS and the positioning hole 18 sealed, the compression force by the upper press board 10A and the lower press board 10B is maintained, and a predetermined temperature (for example, 150 to 210 [° C.]) based on the timer I in step S43. ).

In the first embodiment, the internal space IS when the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B of the press board 10 are in a sealed state via the seal member 11. The dimension interval in the vertical direction of the positioning holes 18 is set to the finished dimension in the thickness direction when the pre-pressing multilayer material NW becomes the laminated plywood PW having a compression rate of 70% by the press board 10. For this reason, the compression ratio of the entire thickness of the multilayer material NW before pressurization, that is, the change in the plate thickness due to the compression of the multilayer material NW before pressurization, is that the peripheral portion 10a of the upper press panel 10A is the peripheral part 10b of the lower press panel 10B. It will be decided by contacting.
The overall compression ratio of the multilayer material NW before pressurization and the laminated plywood PW is calculated by the formula {(thickness of the multilayer material NW before pressurization) − (thickness of the laminated plywood PW)} / thickness of the multilayer material NW before pressurization. The compression rate of the single plate was calculated by the formula {(thickness before pressing) − (thickness after pressing)} / thickness before pressing.

Then, in the sealed state of the internal space IS and the positioning hole 18 shown in FIG. 11C, the compressive force of the upper press board 10A and the lower press board 10B is maintained, and the internal space IS and the positioning hole 18 are at a predetermined temperature ( For example, heating for forming a laminated plywood PW that is maintained for a predetermined time (for example, 30 to 120 [min]) with 150 to 210 [° C.] and does not return when the subsequent cooling and compression is released. Processing is performed. At this time, high-temperature and high-pressure vapor pressure is generated between the surrounding surface of the pre-pressurized multilayer material NW and the inside thereof through the internal space IS and the positioning hole 18 which are sealed by the upper press board 10A and the lower press board 10B. You can go in and out.
As described above, in the present embodiment, the upper press board 10A and the lower press board 10B are in surface contact with the front and back surfaces of the pre-pressurized multilayer material NW and are held in the sealed internal space IS and the positioning holes 18. Therefore, the multilayer material NW before pressurization is sufficiently heated in its entire thickness, and is efficiently compressed and deformed.

Next, as shown in FIG. 11D, when the heat compression process is performed in a sealed state of the internal space IS and the positioning hole 18, the internal space IS and the positioning hole with the pressure gauge P2 as a vapor pressure control process. 18 vapor pressure is detected, and the valve V5 is appropriately opened and closed. Thereby, high-temperature and high-pressure water vapor is discharged from the internal space IS and the positioning hole 18 to the drain pipe 14 side through the pipe port 13a and the pipe 13, and in particular, the moisture content of the outer layer portion of the multilayer material NW before pressurization. Therefore, the excess internal space IS and moisture in the positioning hole 18 are removed, and the internal space IS and the positioning hole 18 are adjusted to have a predetermined vapor pressure. Further, if necessary, a predetermined vapor pressure can be supplied to the internal space IS via the pipe 12 and the pipe port 12a (FIG. 10) connected to the valve V4. As a result, the fixing of the heat compression treatment of the wood, that is, the so-called immobilization of the wood is further promoted.
Further, immediately before the transition from the heating compression to the cooling compression by the upper press panel 10A and the lower press panel 10B, the valve V5 is opened as a vapor pressure control process, so that the internal space passes through the piping port 13a and the piping 13. High-temperature and high-pressure steam is discharged from the IS and positioning hole 18 to the drain pipe 14 side.

If it is determined in step S45 that the heating process in step S46 and the compression process in step S47 based on the operation of the timer I in step S43 are completed, the fixing process is started in step S49. In the fixing process, based on the timer II in step S50, as shown in FIG. 11 (e), normal temperature cooling water or ground water is passed through the piping path 15 of the upper press panel 10A and the piping path 16 of the lower press panel 10B. As a result, the upper press board 10A and the lower press board 10B are cooled to around room temperature and held for a predetermined time (for example, 10 to 120 [min] for oil palm) depending on the material. At this time, the compression force of the upper press panel 10A with respect to the lower press panel 10B on the fixed side is maintained at the same predetermined pressure (for example, 2 to 5 [MPa]) as the pressure at the time of heat compression. The board 10A and the lower press board 10B are cooled.
And finally, as shown in FIG.11 (f), it enters into a pressure release process by step S21, the upper press board 10A is raised with respect to the lower press board 10B of a fixed side, and internal space IS and the positioning hole 18 are used. A series of processing steps is completed when the finished laminated plywood PW is taken out.

  The compacted material manufacturing apparatus 300 for manufacturing the laminated plywood PW according to the present embodiment is mainly a press that forms the internal space IS and the positioning hole 18 by a two-divided structure of an upper press board 10A and a lower press board 10B. Although the board 10 is provided, the movement restriction of the outer periphery of the pre-pressurized multilayer material NW when the present invention is carried out can be the frame body 20. The frame 20 as the movement restriction of the outer periphery of the pre-pressurized multilayer material NW is determined as a structure that can move up and down or a fixed structure depending on the dimensions of the upper press panel 10A.

Here, the oil palm material W to be laminated may be laminated with the same fiber direction, or may be laminated with the fiber directions orthogonal to each other.
When laminated with the same fiber direction, the wood fibers softened in the consolidation process are easily entangled with the other wood surface layer fibers of the same fiber direction adjacent to the lamination direction (longitudinal direction), The wood fixed in the intertwined state is firmly joined. In addition, since the expansion rate and contraction rate of the joint surface can be made completely equal, no stress is applied to the joint surface even if the ambient environment conditions change. Therefore, the bonding strength is high and the mechanical strength is high, and a stable dimensional shape after consolidation is ensured.

On the other hand, when laminated with the fiber directions orthogonal to each other, even if expansion and contraction force occurs due to changes in ambient environmental conditions after consolidation, the mutual woods interact with each other to prevent warping deformation in a specific direction. The
In particular, when the total number of sheets is an odd number, when laminated with the fiber directions orthogonal to each other, the fiber direction of the single plate is parallel and the cross section is symmetric on the front and back, so distortion due to changes in ambient environmental conditions is prevented. The In addition, when the total number of sheets is an even number of four or more, the fiber directions on the front and back sides are laminated by laminating the fiber directions at the same part in the inside and laminating the other with the fiber directions orthogonal to each other. It is possible to prevent distortion and the like due to changes in the ambient environmental conditions.

  In addition, in the oil palm material W to be laminated, the surfaces cut in parallel to the fibers and the tree core side surfaces, or the surfaces cut in parallel to the fibers and the bark side surfaces are laminated to face each other. Is preferred. The warp deformation in a specific direction due to the difference in cell density between the bark side surface and the bark side surface can be prevented by causing the bark side surfaces of each other or the bark side surfaces of each other to face each other and being joined by consolidation.

  Furthermore, among the dried laminated plywood PW, it is preferable that materials having a small air-drying specific gravity after drying are arranged on the front and back and laminated. As a result, wood having a small air-drying specific gravity after drying is disposed on the front and back layers in contact with the upper press platen 10A and the lower press platen 10B, and compaction processing is performed. Therefore, the air-drying specific gravity after drying is small. The wood is sufficiently heated and compressed by the upper press board 10A and the lower press board 10B to reduce the difference in specific gravity between the woods, and the difference in the rate of dimensional change after production. Therefore, the stability of the dimensional shape after commercialization increases.

Next, as shown in FIG. 11, the upper press panel 10A is applied with a predetermined pressure (for example, 0.05 to 0.05) against the plurality of stacked multi-layered pre-pressing materials NW placed on the fixed-side lower press panel 10B. 0.3 MPa), and brought into contact with the upper surface of the laminated pre-pressing multilayer material NW, that is, a plane perpendicular to the fiber length direction.
Then, at the beginning of the compacting process, first, heating in the heating process (step S46) is started, and the valve V1, valve V2, and valve V3 (FIG. 10) are opened, and the piping 15 of the upper press panel 10A from the boiler device (not shown). And the water vapor for heating is passed through the pipe line 16 of the lower press panel 10B, the interior space IS and the positioning hole 18 are maintained at a predetermined heating temperature, and the laminated multilayer material NW before pressurization is heated.

  Here, it is preferable that the heating temperature in the heating process in the initial stage of compression is in the range of 110 ° C to 160 ° C. If the heating temperature is too low, sufficient compacting will not be achieved, resulting in insufficient strength, poor bonding between wood, and dimensional shape deformation due to hygroscopic drying after product production, while the heating temperature is too high. The surface may be carbonized to change to black and the color tone or scent peculiar to wood may be impaired, or the material may deteriorate and the strength may be lowered and become brittle. According to the experiments by the present inventors, it has been found that an appropriate temperature condition is in the range of 110 ° C to 160 ° C. By using this temperature condition, it is possible to prevent improper fixing in the compacting process, and material deterioration such as surface carbonization and lowering of material strength. More preferably, the heating temperature in the heating step in the initial stage of compression is in the range of 120 ° C to 140 ° C. The specific set temperature is set according to the moisture content of the oil palm material W and the like.

  Subsequently, in the compression step of step S47, the compression pressure of the upper press board 10A is set to a predetermined pressure with respect to the lower press board 10B on the fixed side, and the pre-pressing multilayer material NW becomes the upper press board 10A and the lower press board. It is heated and compressed at 10B for a predetermined time. At this time, as shown in FIG. 11 (c), when the peripheral edge portion 10a of the upper press board 10A comes into contact with the peripheral edge part 10b of the lower press board 10B, the seal member 11 disposed on the peripheral edge part 10a of the upper press board 10A. As a result, the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B are sealed.

  Thus, by heating and compressing by surface contact of the press panel, in particular, by applying pressure after heating to the heating temperature, even when warp deformation during drying occurs in the multilayer material NW before pressurization, Flattening can be achieved without causing cracks, cracks, etc., and heat compression can be performed efficiently. Furthermore, while the multilayer material NW before pressurization is heated and compressed and the internal space IS and the positioning hole 18 are kept in a sealed state, the water vapor originally contained in the multilayer material NW before pressurization becomes the vapor pressure. Thus, the dried wood DW can be freely diffused and discharged through the internal space IS and the positioning hole 18, so that the entire thickness is efficiently and uniformly heated and compressed.

  Here, the predetermined pressure for compressing the multilayer material NW before pressurization is preferably in the range of 0.1 MPa to 10 MPa. If the pressure is too low, immobilization will be poor in the compacting process, while if the pressure is too high, cracks may occur on the surface. According to the experiments by the present inventors, suitable pressure conditions are in the range of 0.1 MPa to 10 MPa. By adopting this pressurizing condition, it is possible to prevent immobilization defects and occurrence of cracks in consolidation. More preferably, it is in the range of 1 MPa to 5 MPa.

  In addition, when the compression speed at this time is high, water vapor and air in the multilayer material NW before pressurization are difficult to escape, and the pressure acting on the multilayer material NW before pressurization increases, so that cracks occur, There is a risk of internal cracking due to insufficient softening of wood. On the other hand, when the compression speed is low, the load on the surface in contact with the upper press board 10A and the lower press board 10B is increased, and cracks or the like may occur. Therefore, it is desirable that the compression pressure at this time be gradually increased according to the temperature transmission state inside the pre-pressurized multilayer material NW.

  Furthermore, according to the experiments by the present inventors, it is preferable that the time for heating and compressing be in the range of 10 minutes to 40 minutes. This time condition can prevent subsequent immobilization due to the treatment time being too short and carbonization of the surface due to the treatment time being too long. More preferably, the predetermined time during compression is in the range of 20 minutes to 30 minutes. In addition, it is preferable to set also the time of this heat compression considering the transmission state (time) of the temperature inside the multilayer material NW before pressurization.

  Note that the internal space IS and the positioning hole 18 formed by the upper press board 10A and the lower press board 10B of the press board 10 are hermetically sealed via the seal member 11, and the vertical direction of the internal space IS and the positioning hole 18 is as follows. The dimension interval is set to the finished dimension in the thickness direction when the plurality of laminated multi-layered pre-pressurized materials NW are consolidated into a laminated plywood PW having an air-dry specific gravity of 0.8 or more. For this reason, the compression ratio of the entire thickness of the laminated multilayer material NW before pressurization, that is, the change in the plate thickness due to the compression of the plurality of laminated multilayer materials NW before pressurization is the peripheral portion 10a of the upper press panel 10A. Is determined by contacting the peripheral edge portion 10b of the lower press panel 10B.

  Next, the predetermined compression pressure (preferably within the range of 0.1 MPa to 10 MPa) is maintained by the upper press board 10A and the lower press board 10B in a sealed state of the internal space IS and the positioning hole 18 shown in FIG. The temperature is raised to a specific heating temperature by the piping 15 of the upper press panel 10A and the piping 16 of the lower pressing panel 10B, and the internal space IS and the positioning hole 18 are maintained at the predetermined heating temperature for a predetermined time. . At this time, a high-temperature and high-pressure vapor pressure is generated between the surrounding surface of the pre-pressurized multilayer material NW and the inside thereof through the internal space IS and the positioning hole 18 which are sealed by the upper press platen 11 and the lower press platen 21. You can go in and out.

  Then, when the heat compression process is performed with the internal space IS and the positioning hole 18 sealed, the vapor pressure control process detects the vapor pressure of the internal space IS and the positioning hole 18 with the pressure gauge P2. As shown in (d), the vapor pressure of the second heating temperature is supplied to the internal space IS through the pipe 12 and the pipe port 12a connected to the valve V4, or the valve V5 is appropriately opened and closed. Then, high-temperature and high-pressure water vapor is discharged from the internal space IS to the drain pipe 14 side through the pipe port 13a and the pipe 13, whereby the vapor pressure of the internal space IS and the positioning hole 18 is controlled to a predetermined value.

  Thus, the wood is heated and compressed by controlling the vapor pressure of the internal space IS and the positioning hole 18. That is, the entire surface of the multilayer NW before pressurization is made uniform with the same temperature, pressure, and vapor pressure as the interior space IS and the positioning hole 18 in the peripheral surface of the wood and the interior thereof, so that processing distortion does not occur and molding is performed. The contraction and expansion due to the subsequent restoring force and changes in ambient environmental conditions are significantly suppressed. In particular, by controlling the vapor pressure by discharging or introducing water vapor while maintaining a predetermined pressure state, the surface is prevented from being carbonized, uniformly heated and compressed, and further, the surface is prevented from drying. Smooth fixation is achieved, and recovery, return, deformation, etc. after molding are suppressed.

  Here, it is preferable that the final heating temperature for maintaining the heating and compression state for compaction is in the range of 120 ° C to 210 ° C. If the heating temperature is too low, the immobilization becomes sweet and chemical changes due to the action of water vapor cannot be caused sufficiently, resulting in improper immobilization, which tends to occur due to moisture absorption or deformation due to drying, while the heating temperature is high. If it is too much, the surface may be carbonized to change to black, and the color tone or scent peculiar to wood may be impaired, or the material may deteriorate and the strength may be lowered and become brittle. According to our experiments, suitable temperature conditions are in the range of 120 ° C to 210 ° C. By setting this temperature condition, it is possible to prevent immobilization failure in the compacting process, maintain dimensional shape stability, and prevent material deterioration such as surface carbonization and material strength reduction. More preferably, the heating temperature is in the range of 120 ° C to 140 ° C.

  Further, according to the experimental study by the present inventors, the compression time immediately before immobilization is preferably in the range of 10 minutes to 120 minutes. By this time condition, it is possible to prevent immobilization failure due to the treatment time being too short and carbonization of the surface due to the treatment time being too long. More preferably, the predetermined time is in the range of 30 minutes to 90 minutes. The specific set time for performing the heating / compression process immediately before the immobilization is set in consideration of the moisture content of the multilayer material NW before pressurization.

  Incidentally, the start of the vapor pressure control in the internal space IS and the positioning hole 18 in the sealed state due to the introduction or discharge of water vapor is performed after the temperature of the upper press panel 10A and the lower press panel 10B reaches a specific heating temperature. It is desirable to be done. If it does in this way, water vapor can osmose | permeate in the multilayer material NW before pressurization, and, thereby, can cause the chemical change of the oil palm material W enough, As a result, the oil palm material W is fully and uniformly fixed. Therefore, there is little return due to moisture absorption, deformation due to drying, and the like. That is, when the introduction of water vapor in the closed internal space IS and the positioning hole 18 is started before the temperatures of the upper press board 10A and the lower press board 10B reach a specific heating temperature, the water vapor is condensed. The interior space IS and the positioning hole 18 in the sealed state are filled with water, and the moisture content of the wood increases, and as a result, return due to moisture absorption, deformation due to drying, and the like are likely to occur.

Further, even when the discharge of water vapor in the internal space IS and the positioning hole 18 in the sealed state is started before the temperatures of the upper press board 10A and the lower press board 10B reach the second heating temperature, the water content of the outer layer portion is also increased. The excess internal space IS based on the rate and the moisture in the positioning hole 18 are difficult to be removed, and the moisture content of the wood increases, so that return due to moisture absorption, deformation due to drying, and the like are likely to occur.
In addition, it is preferable to end the vapor pressure control before starting the cooling described later. If the vapor pressure control is not finished before starting the cooling described later, the cooling processing efficiency is lowered.

  Further, when steam is introduced into the internal space IS and the positioning hole 18 in a sealed state to control the vapor pressure, the temperature of the upper press panel 10A and the lower press panel 10B reaches a specific heating temperature. It is preferable to introduce a water vapor pressure and temperature equal to or lower than the water vapor pressure and temperature in the internal space IS and the positioning hole 18. When the pressure and temperature of the introduced water vapor are higher than the water pressure and temperature in the internal space IS and the positioning hole 18, the water is condensed and the internal space IS and the positioning hole 18 in a sealed state are filled with water. As a result, the moisture content of the oil palm material W increases, and as a result, return due to moisture absorption, deformation due to drying, and the like easily occur. In addition, in the internal space IS and the positioning hole 18 in a sealed state, when excess moisture based on the moisture content of the outer layer portion of the multilayer material NW before pressurization exists, the high temperature in the internal space IS and the positioning hole 18 By appropriately discharging high-pressure water vapor, the pressure is adjusted to a predetermined vapor pressure.

Subsequently, the immobilization process in step S49 is performed while the valve V11 is maintained at the same predetermined pressure (preferably within the range of 0.1 MPa to 10 MPa) as the pressure in the heating process in step S46 and the compression process in step S47. , The valve V12 and the valve V13 (FIG. 8) are opened, and normal temperature cooling water is passed from the boiler device (not shown) through the piping 15 of the upper press panel 10A and the piping 16 of the lower press panel 10B. As shown in e), the upper press board 10A and the lower press board 10B are cooled to around room temperature and held for a predetermined time (for example, 10 to 120 [min]).
Finally, the pressure is released in the fixing step of step S49, and as shown in FIG. 11 (f), the upper press disk 10A is gradually raised and separated from the fixed lower press disk 10B. The pressure and the sealed state are released, and the laminated plywood PW as a finished product is taken out from the internal space IS and the positioning hole 18 to complete a series of processing steps.

  Thus, the fixing in the compacted state is stabilized by cooling under the pressure state in which no deformation occurs. And after cooling in a pressurized state, by releasing the pressurization, that is, by lowering the water vapor pressure in the multilayer material NW before pressurization by cooling, gradually releasing the pressure to release the internal vapor pressure Thus, the laminated plywood PW can be liquefied and removed when the cooling compression is released, and there is no bulging deformation, cracking, puncture or the like. That is, according to the laminated plywood PW of the present embodiment, stable quality is ensured without causing bulging deformation, cracking, destruction, etc. after compression release.

  In this way, the entire thickness of the laminated multilayer material NW before pressurization is heated and compressed by an external force applied in a direction perpendicular to the length direction of the fibers of the laminated multilayer material NW before pressurization. A laminated plywood PW having a dry specific gravity of 0.8 or more is manufactured. And the laminated plywood PW obtained in this way is firmly joined to each other by consolidation. This is because cellulose, hemicellulose, and lignin are hydrogen-bonded by compaction processing, and especially the palm of an oil palm contains many sugars, lignin, plastic components, etc., and these components are decomposed and softened by compaction processing. It functions as a binder by being recrystallized and re-bonded after moving between woods, and further, the fibers of the surface layer of the oil palm material W are softened by the consolidation process, and the wood is adjacent in the stacking direction. It is considered that the woods are firmly joined by being intertwined with the fibers.

As described above, according to the laminated plywood PW according to the present embodiment, wood is bonded without using an artificial adhesive or environmental adhesive due to formaldehyde or the like, and a natural adhesive having a high cost. It is gentle and can reduce costs.
In addition, when the oil palm material W is joined by using an adhesive, it is common to apply the adhesive and then to press the adhesive to cure the adhesive. While the tightening process is necessary, according to the laminated plywood PW according to the present embodiment, the wood is joined without using an adhesive by the compacting process, so that the separate joining process is unnecessary. The manufacturing process can be simplified.

  The laminated plywood PW obtained in this way is compacted to reduce the gaps in the oil palm material W, and the lignin, hemicellulose, etc. constituting the cell wall are softened / decomposed and recombined / re-assembled. The disadvantage of the oil palm material W, which is crystallized to increase the cell density, has a low specific gravity, is low in strength, and easily deforms, is complemented, and high strength and stable dimensional shape are ensured. In particular, the entire thickness of the laminated oil palm material W is uniformly compressed by carrying out the consolidation process so that the air-dry specific gravity is 0.8 or more, the properties of the oil palm material W are changed, and the hardness and the like are remarkable. In addition, there is less variation in physical properties and characteristic values such as hardness, and there is also little variation in expansion rate and drying rate due to changes in ambient environmental conditions, so that deformation and the like can be suppressed, thereby improving dimensional shape stability. Increase. Therefore, the physical properties are stable, the quality between products is small, and the commercial value is high. Furthermore, it is consolidated in a state where a plurality of dried oil palm materials W are stacked, and the expansion rate and contraction rate due to changes in ambient environmental conditions are substantially uniform on the bonding surface, so that stable bonding is maintained. In addition, a stable dimensional shape is ensured without causing distortion, deformation, cracks, and the like due to stress applied to the joint surface due to changes in ambient environmental conditions.

In particular, when the oil palm material W is laminated with the same fiber direction, the fibers of the surface layer softened in the consolidation process are easily entangled with the wood fibers of the tree surface layer that are adjacent in the vertical direction with the same fiber direction. The oil palm material W fixed in the entangled state is firmly joined. In addition, since the expansion rate and contraction rate at the joint surface can be made completely equal, no stress is applied to the joint surface when the ambient environmental conditions change. Therefore, the bonding strength is high, the mechanical strength is also high, and high dimensional shape stability is ensured.
On the other hand, when the multilayered material NW before pressurization is laminated with the fiber directions orthogonal to each other, even if expansion and contraction force is generated due to changes in the surrounding environmental conditions after the consolidation process, the mutual woods interact with each other and specify Directional warpage deformation is prevented. In particular, when the total number of sheets is an odd number, when laminated with the fiber directions orthogonal to each other, the fiber direction of the single plate is parallel and the cross section is symmetric on the front and back, preventing distortion due to changes in ambient environmental conditions, etc. Is done.
If the total number of sheets is an even number, the same fiber direction is laminated in a part of the inside, and the others are laminated with the fiber directions orthogonal to each other, so that the front and back fiber directions are aligned and the ambient environmental conditions It is possible to prevent distortion and the like due to the change of.

The laminated plywood PW of the present embodiment is densified by compaction processing on the front and back surfaces that are compressed surfaces, and the fibers of the oil palm material W are entangled and fixed, and there is a concern about environmental impact. Even without using a natural adhesive or a high-cost agent, it is difficult to peel off from the outer surface, and the surface quality is good. That is, since peeling from the surface of the fiber can be suppressed without using an artificial adhesive or a natural adhesive having a high cost, it is environmentally friendly and the cost can be reduced.
Furthermore, since the entire thickness is plastically processed, even if a large chamfering process or curved surface process is performed on the ridgeline on the thickness side surface, the material strength with high hardness is ensured at the end surface.

By the way, even when oil palm material W near the soft core with a high moisture content is used, the strength can be increased by compaction processing, or by performing temperature and compression control in compaction processing, Excess water can be discharged, and the water vapor pressure inside the multilayer material NW before pressurization is uniformly and suitably adjusted, so that bulge deformation after compression processing is also suppressed. Therefore, it is possible to form the laminated plywood PW having sufficient strength and stable dimensional shape. Therefore, effective utilization of the whole trunk of oil palm can be aimed at.
In particular, in the dried oil palm material W, when the air-drying specific gravity after drying is arranged and stacked on the front and back, the front and back layers that are in contact with the upper press panel 10A and the lower press panel 10B as described above. Since a material having a small air-dry specific gravity after drying is disposed and compaction processing is performed, sufficient heat compression is performed by the upper press panel 10A and the lower press panel 10B in the material having a small air-dry specific gravity after drying. Thus, the difference in specific gravity between the woods is reduced, and the difference in the dimensional change rate after commercialization is also reduced. Therefore, the stability of the dimensional shape after commercialization increases.

  As described above, the laminated plywood PW according to the present embodiment is obtained by peeling the trunk of a soft oil palm having a high moisture content as the oil palm material W, and then drying, further laminating a plurality of sheets, and compacting the surface. Not only the strength and hardness of the entire plate thickness are greatly improved, but a wide range of applications such as flooring materials, waistboard materials, indoor furniture materials, and housing exterior materials used by surface coating are expected. In particular, since the surface hardness is increased by compaction processing and sufficient strength and hardness can be ensured even if the thickness is small, the thickness can be reduced in commercialization.

The frame 20 shown in FIG. 12 is a modification of the first embodiment and has a structure that can move up and down, and is disposed on the lower press panel 10B of FIGS. 10 and 11, and is positioned. It replaces the hole 18.
An outer lower press disk 10Ba and an inner lower press disk 10Bb having the same height are disposed on the base plate 25 of the lower press disk 10B, and a frame groove 21 is formed therebetween. A plurality of coil springs 22 are disposed on the base plate 25 side of the frame body groove 21, and a square movable frame 23 is disposed above the coil springs 22. A cutout is formed on the inner surface of the movable frame 23 to form a fluid path 24 that guides fluid such as water vapor from the side surface of the pre-pressurized multilayer material NW. The inner periphery of the square movable frame 23 is substantially equal to the outer periphery of the multilayer material NW before pressurization, and if the multilayer material NW before pressurization enters the square movable frame 23, the oil palm material W will not be displaced. It has become.

  Therefore, when the upper press board 10A is lowered, even if it has a width larger than the size of the lower press board 10B, when the upper press board 10A comes into contact with the movable frame 23, the movable frame 23 becomes elastic to the plurality of coil springs 22. It descends against it and responds to the compression of the multilayer material NW before pressurization. Then, the compression of the pre-pressurized multilayer material NW is completed at the movement limit of the plurality of coil springs 22. Of course, when the upper press board 10A is inserted into the movable frame 23 of the lower press board 10B, the movable frame 23 can be fixedly arranged on the lower press board 10B. That is, the movable frame 23 of the lower press panel 10B can be fixed and compressed by the upper press panel 10A inserted into the movable frame 23.

  Thus, the thickness of the oil palm material W is heated and compressed by the external force applied in the direction perpendicular to the length direction of the fibers of the oil palm material W, and the whole is compacted to a compression rate of 60% or more. The laminated plywood PW is manufactured. At this time, the expansion in the direction parallel to the plane of the oil palm material W is restricted by the movable frame 23 by the compressive force in the thickness direction of the oil palm material W, and does not extend.

  In this embodiment, after the vapor pressure is controlled, the pressure is gradually released to release the internal vapor pressure, and the water vapor pressure in the pre-pressurized multilayer material NW is lowered and fixed by cooling. When the compression is released, a laminated plywood PW having no surface deformation called bulging deformation or puncture can be formed. That is, the laminated plywood PW manufactured in the present embodiment does not cause bulging deformation or surface cracking after being released from compression, and ensures stable quality. In the present embodiment, the upper press board 10A and the lower press board 10B are compressed and fixed to obtain the laminated plywood PW. However, in the case of carrying out the present invention, a microwave used by a normal microwave oven is used. The laminated plywood PW can be obtained even if the multilayer material NW before pressurization is heated and compressed by dielectric heating at a high frequency slightly lower than the wave frequency band, and is fixed.

  Since this oil palm trunk WD has no nodes and no annual rings, when the oil palm material W is created by peeling off from the outer periphery to a predetermined thickness by a rotary race, a uniform oil palm material W is obtained. As a result, the oil palm material is obtained. The laminated plywood PW made of W is homogeneous. Moreover, since the joining force is changed by the resin component and sugar component contained in the oil palm trunk WD itself depending on the applied temperature and pressure, an arbitrary adhesive force can be obtained by controlling the applied temperature and pressure. And in what forms the laminated plywood PW by joining a plurality of oil palm materials W with a resin component and a sugar component contained in the oil palm trunk WD itself, other synthetic resins and synthetic rubbers are used as adhesives. Because it is not, it can be returned to nature and does not cause pollution problems.

Furthermore, since the oil palm trunk WD itself contains a resin component such as lignin and the compressive force when joined by the action of sugars such as cellulose and hemicellulose, the oil palm material W is almost free of voids and becomes a dense structure. It is water-resistant and has excellent waterproofing and insect-proofing properties, and even if used as a building material, it has a long service life.
In particular, hemicellulose has a function of binding lignin and cellulose, and it is unclear how much they interfere with each other when the oil palm trunk WD is naturally cultivated. However, it was confirmed that by raising the temperature to a predetermined temperature, for example, 80 ° C. or more of the reaction start temperature of lignin, the reaction start temperature of hemicellulose was 60 ° C. or more, and they reacted with each other to become firm characteristics.

The laminated plywood PW of the above embodiment is formed by peeling a predetermined length of oil palm trunk WD from the outer periphery with a rotary race while rotating it in the circumferential direction, and the thickness of one piece obtained by compacting it is 1 mm. Two or more oil palm materials W composed of the above and a Lauan trunk, a Chinese trunk or a coniferous trunk of a predetermined length are rotated and formed in a rotary race while being peeled off from the outer periphery to a predetermined thickness. Are integrally joined.
Therefore, since the oil palm material W is at least consolidated, when the resin component and sugar component contained in the oil palm material W are insufficient, an adhesive is added to the objects to be joined, and the desired laminated plywood is laminated. PW is manufactured. Therefore, since the adhesive is used when the resin component and the sugar component contained in the oil palm material W are insufficient, the use of the formaldehyde-based adhesive that causes sick house syndrome is suppressed, A laminated plywood PW utilizing the components it has is obtained.

One or more of any of the two or more oil palm materials W that are disposed facing the oil palm material W of the above-described embodiment and are joined together, and other plate materials such as lauan boards, sina boards, or coniferous boards. The laminated plywood PW that is integrally joined with the resin can use the resin component and the sugar component contained in the oil palm material W for the joining, and can compress and fix them to integrally join them.
Therefore, since two or more oil palm materials W are laminated plywood PW and can be integrally joined using a resin component and a sugar component contained in the oil palm material W, use of a formaldehyde adhesive that causes sick house syndrome is used. A laminated plywood PW using the components inherently held by the oil palm trunk WD is obtained.

The resin palm and the sugar component contained in the oil palm material W are used to join two or more oil palm materials W that are arranged facing the oil palm material W of the above-described embodiment and are integrally joined. In addition to the resin component and sugar component contained in the oil palm material W on the joint surface that is integrally joined to two or more of either the Chinese board or the coniferous board, oil palm Formaldehyde system that causes sick house syndrome, since the resin component and sugar component contained in the material W are used, and one or more of either lauan plate, china thin plate or softwood plate can be firmly joined. The use of the adhesive is suppressed, and the laminated plywood PW using the components that oil palm originally has is obtained.
In particular, by reducing the number of lauan boards than the number of oil palm materials W, the use of formaldehyde-based adhesives that cause sick house syndrome is suppressed to ½ or less, at least compared to conventional laminated plywood. Can do.

Further, in the step of heating to raise the temperature of the oil palm material W laminated after the laminating step, the step of introducing water vapor or electric heat and heating or heating with a hot plate is because the heating energy is supplied. It can be. Furthermore, the step of applying a compressive force in a direction perpendicular to the surface of the oil palm material W to the laminated oil palm material W heated by the heating step is compression of the oil palm material W at a predetermined compression rate. That is, it is only necessary to compress the multilayer material NW before pressurization. This step can be a compression step.
In addition, after compressing for a predetermined time in the compression step, the temperature supplied in the heating step is lowered, the compression state of the laminated plywood PW is fixed, and the compression force compressed at a predetermined compression rate is released. This can be taken from the laminated plywood PW and used as an immobilization process.

  As described above, the laminated plywood PW of the above-described embodiment is a plurality of oil palm materials W that are peeled off with a cutter CT from the outer periphery to a predetermined thickness with a rotary race while rotating the oil palm material W of a predetermined length in the circumferential direction. Arrangement of the material forming step of step S40 to be formed, the drying step of step S41 for drying the oil palm material W, and the step S42 of laminating a plurality of oil palm materials W dried in the drying step in a predetermined state In the process, the heating process of step S46 for heating to raise the temperature of the laminated oil palm material W after the arrangement process, and the laminated oil palm material W heated by the heating process, Compressing for a predetermined time by applying a compression force in a direction perpendicular to the surface of the oil palm material W while restricting extending in a direction parallel to the surface of the material W A compression step of step S47 that, after pressing a predetermined time, the compression step is one comprising the step of immobilizing step S49 for immobilizing by lowering the temperature which has been supplied in the heating step.

  Therefore, since the oil palm trunk WD used in these steps has no nodes and no annual rings, when the oil palm material W is created by peeling off from the outer periphery to a predetermined thickness with a rotary race, a homogeneous oil palm material W is obtained, As a result, the laminated plywood PW made of the oil palm material W becomes homogeneous. In addition, since the bonding force can be changed by the action of resin components such as lignin contained in the oil palm trunk WD itself and sugars such as cellulose and hemicellulose, depending on the applied temperature and compressive force, the control of the applied temperature and compressive force is possible. Arbitrary adhesive strength can be obtained. Since a plurality of oil palm materials W are joined by the action of resin components such as lignin contained in the oil palm trunk WD itself and sugars such as cellulose and hemicellulose, the laminated plywood PW is formed. Since resin and synthetic rubber are not used as adhesives, they can be returned to nature without causing pollution problems. Furthermore, since the oil palm trunk WD itself contains a resin component such as lignin and the compressive force when joined by the action of sugars such as cellulose and hemicellulose, the oil palm material W is almost free of voids and becomes a dense structure. It is water-resistant and has excellent waterproofing and insect-proofing properties, and even if used as a building material, it has a long service life.

  Since the wood drying apparatus and the drying method thereof according to Embodiment 1 and Embodiment 2 have a moisture content after drying of the oil palm material W within a range of 10% to 30%, cracks, Deformation, swelling, rupture, etc. are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, when the moisture content is in a dry state within a range of 10% to 30%, it is also suitable for joining with a lauan board, a Chinese board, a coniferous board, and the like.

  In the laminating step of laminating a plurality of oil palm materials W in the method for manufacturing the laminated plywood according to the first embodiment and the second embodiment, the fiber directions are the same as each other. Because they are laminated in the same way, they are joined along the length direction of the original trunk, and the fibers softened in the consolidation process are easily entangled with other fibers adjacent in the lamination direction with the same fiber direction. It is fixed in the state. That is, the fibers are entangled with each other by the consolidation process, and the bonding strength is increased. Therefore, the mechanical strength is high, and a stable dimensional shape after consolidation is ensured. Furthermore, by laminating the fibers in the same fiber direction, the expansion rate and contraction rate at the joint surface can be made completely the same, and the dimensional shape stability is higher without applying stress. .

  Since the laminating process of the oil palm material in the manufacturing method of the laminated plywood according to the first embodiment and the second embodiment is the direction in which the fiber directions are orthogonal to each other, the change in ambient environmental conditions after the consolidation process Even if an expansion and contraction force is generated by the above, the fibers interact with each other to prevent warping deformation in a specific direction, a good balance state is achieved, and the dimensional shape stability is improved.

  Since the drying process of step S41 of the manufacturing method of the laminated plywood of Embodiment 1 and Embodiment 2 is to dry the moisture content of the oil palm material W within the range of 10% to 30%, , Deformation, swelling, rupture and the like are prevented. Therefore, more stable dimensional shape is ensured and the yield is high. Moreover, when the moisture content is in a dry state within the range of 10% to 30%, it is also suitable for joining with lauan wood, china wood, conifer wood and the like.

  Since the heating temperature in the heating process of step S46 of the manufacturing method of the laminated plywood according to the first embodiment and the second embodiment is within the range of 110 ° C. to 170 ° C., immobilization failure in the consolidation process and It is possible to prevent poor bonding between wood, and material deterioration such as surface carbonization and lowering of material strength. Moreover, when the heating temperature is in the range of 110 ° C. to 170 ° C., it is also suitable for joining with a lauan plate, a Chinese plate, a coniferous plate, or the like.

  Since the predetermined compression pressure by the compression process of step S47 of the manufacturing method of the laminated plywood of the first embodiment and the second embodiment is within the range of 0.1 MPa to 10 MPa, the immobilization in the consolidation process is performed. It is possible to prevent defects, bonding between woods, and surface cracks. It was confirmed that there was no problem in joining with Lauan board, China board, coniferous board, etc.

  Since the time required for the heating process in step S46 and the compression process in step S47 of the method for manufacturing the laminated plywood of the first embodiment and the second embodiment is within a range of 10 minutes to 120 minutes, It is possible to prevent improper fixing, poor bonding between woods, and carbonization of the surface. It has been confirmed by the inventors' experiment that there is no problem in joining with Lauan boards, Chinese boards, coniferous boards, and the like.

  As explained at the beginning, the drying of oil palm is common wood such as cedar, cedar, rice bran, bamboo shoots, rice cedar, pine pine, red pine, chestnut, bamboo shoots, bamboo shoots, sakura, cherry, bamboo shoots, cocoons, etc. Compared with wood grain material, the moisture content is high, the moisture content varies greatly depending on the location, and the sugar concentration is also high. If this oil palm can be dried, ordinary wood can be used sufficiently. Therefore, the explanation about the details of general wood is omitted.

WD Oil palm trunk W, W1,..., W4 Oil palm material NW Multilayer material PW before pressurization Laminated plywood 10 Press panel 49 Pump 50, 70 Storage chamber 100 Oil palm (wood) drying device 200 Oil palm (wood) Dryer 300 Consolidation processing material manufacturing equipment

Claims (8)

Oil palm material with a predetermined length of oil palm trunk peeled to a predetermined thickness in the circumferential direction or an oil palm material or other wood made from a predetermined length of oil palm trunk with a predetermined thickness in the length direction is heated from both sides A plurality of heating plates,
A press mechanism for applying a compressive force between the hot plate and the oil palm material or the wood at a predetermined pressure;
A storage chamber for storing the oil palm material or the wood and the hot plate, and separating the internal pressure of the storage from the atmospheric pressure;
A wood drying apparatus comprising: a pump for exhausting or sucking air from the housing chamber. An oil palm material in which a predetermined length of oil palm trunk is peeled to a predetermined thickness in the circumferential direction, or an oil palm material or other wood that is formed from a predetermined length of oil palm trunk in a predetermined thickness in the length direction Forming process;
A hot plate heating step comprising a plurality of hot plates for heating the oil palm material or the wood from both sides with a hot plate;
A compressive force applying step of applying a predetermined compressive force by a press mechanism to the oil palm material or the wood between the hot plates;
A moisture discharge step of separating an internal pressure of a storage chamber containing the oil palm material or the wood and the hot plate from an atmospheric pressure, and exhausting or sucking air from the storage chamber by a pump. How to dry wood. Dielectric heating is performed on an oil palm material in which a predetermined length of an oil palm trunk is peeled to a predetermined thickness in the circumferential direction, or an oil palm material or other wood that is obtained by sawing a predetermined length of an oil palm trunk in a predetermined thickness in the length direction. A dielectric heating source;
A storage chamber for storing the oil palm or the wood material and separating the indoor pressure for dielectric heating with the dielectric heating source from atmospheric pressure;
A wood drying apparatus comprising: a pump for exhausting or sucking air from the housing chamber. An oil palm material in which a predetermined length of oil palm trunk is peeled to a predetermined thickness in the circumferential direction, or an oil palm material or other wood that is formed from a predetermined length of oil palm trunk in a predetermined thickness in the length direction Forming process;
A dielectric heating step of dielectrically heating the oil palm material or the wood with a dielectric heating source;
And a humidity exhausting step of separating the indoor pressure for accommodating the oil palm material or the wood and performing dielectric heating by the dielectric heating source from atmospheric pressure, and exhausting or sucking air from the accommodating chamber by a pump. How to dry wood.   4. The wood drying apparatus according to claim 1, wherein a moisture content of the oil palm material or the wood after drying is in a range of 10% to 30%. 5.   The method for drying wood according to claim 2 or 4, wherein the moisture content of the oil palm material or the wood after drying is within a range of 10% to 30%.   The heating temperature of the hot plate or the dielectric heating temperature for heating the oil palm material or the wood is a temperature within a range of 100 to 150 ° C. lower than the fixing temperature of the oil palm material or the wood, and the upper limit temperature. The wood drying apparatus according to claim 1 or 3, wherein the wood drying apparatus is characterized.   The heating temperature of the hot plate or the dielectric heating temperature for heating the oil palm material or the wood is a temperature within a range of 100 to 150 ° C. lower than the fixing temperature of the oil palm material or the wood, and the upper limit temperature. The method for drying oil palm according to claim 2 or 4, wherein the oil palm is dried.

Images