CN101428431A - Method for producing xylon molded body and xylon molded body - Google Patents
Method for producing xylon molded body and xylon molded body Download PDFInfo
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- CN101428431A CN101428431A CNA2008101660520A CN200810166052A CN101428431A CN 101428431 A CN101428431 A CN 101428431A CN A2008101660520 A CNA2008101660520 A CN A2008101660520A CN 200810166052 A CN200810166052 A CN 200810166052A CN 101428431 A CN101428431 A CN 101428431A
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Abstract
The invention relates to a woody material resinification, especially to a method for manufacturing a woody formed article and the woody formed article which is characterized by a reduced odor and a low water absorption ratio of a woody material resinification topic. The invention relates to the method for manufacturing the woody formed article which shows an adhesivity or a thermal flow property in the woody article and the woody formed article. After the moisture percentage of the woody material is regulated, the cooking treatment to a woody tissue by contacting a heated aqueous vapor can reduce the water absorption ratio and the odor from a formic acid or an acetic acid to minimum.
Description
Technical field
The present invention relates to the resinification of wood materials, relate to so that reduce and water absorption rate is reduced to the manufacture method and the xylon molded body of the xylon molded body of feature as the smell of the resinification problem of wood materials.
Particularly, the present invention relates to behind the moisture content of adjusting wood materials, make the water vapour contact lignum of heating to make wooden cohesive and the thermal fluidity that is had that show, the manufacture method and the formed body thereof of the xylon molded body that described wood materials shaping is obtained; It is low to relate to water absorption rate, and from organic acid smells such as formic acid or acetate or as the manufacture method of diffusing few xylon molded body and the xylon molded body of the formaldehyde of organic compound.
Background technology
Attempt utilizing the substitution material of timber so far as plastics or metal etc. always.For example, disclose in the patent documentation 1 by containing lignin, hemicellulose and cellulosic wood materials and carried out steam treatment (boiling processing hereinafter referred to as), then the manufacture method of the formed body that pressurization forms in heating.According to described formed body, can make the existing various products of shapings such as metal or plastics that utilize instead of wood materials.Particularly, can not use plastics and utilize and be derived from natural wood materials and make various products, for example (patent documentations 1) such as tableware or ornament, furniture, building materials, electrified products.
And, proposed to realize the method for the flowability of wood materials than form more completely, described method is: the material that will contain lignocellulosic carries out boiling processing, drying, the shaping that comprises the lignocellulose material of gained is heated with composition, make this moulding material fusion, give the method (patent documentation 2) of its shape.
[patent documentation 1] TOHKEMY 2004-261967 communique
[patent documentation 2] TOHKEMY 2003-165844 communique
Summary of the invention
Invent problem to be solved
Yet the formed body that the wood materials of being handled by boiling forms soaked the water absorption rate that has in the water absorption test up to 4%～8% at 24 hours, if be used for the problem that mechanical part can produce the durability aspect, so an urgent demand reduces water absorption rate and keeps durability.And produce wooden can the decomposition such as formic acid or acetate etc. during owing to boiling processing wood materials, heating, can distribute strong smell when pressurizeing, and must solve the problem of this smell during therefore as product.
Consideration by protective coating such as coating varnish etc. addressing these problems, but protective coatings such as varnish are made as principal component with chemical compositions such as synthetic resin or organic solvents.If therefore make for earth environment more good quality production, must avoid using above-mentioned material.And, when coating varnish, corresponding increase during the worker of product, cost rises.The technology that can reduce water absorption rate, smell because above-mentioned reason, an urgent demand occur not being coated with varnish.
Therefore, the object of the present invention is to provide in the formed body that forms by wood materials, reduced the formed body and the manufacture method thereof of the generation of the water absorption rate of formed body and smell.
Solve the method for problem
The result of inventor's further investigation, found to make heating steam good to the infiltration in the lignum by the wooden moisture content of adjusting before boiling is handled, minimizing can promote the free water of the decomposition of the relatively low hemicellulose of decomposition temperature, lignin, can improve the water absorption rate of formed body.
If the wood materials before boiling is handled contains many free waters, described free water can be transformed into steam by the boiling processing is penetrated in the wood materials, make cellulose, lignin, hemicellulose excessive decomposition or outflow, therefore have and be reduced in lignin or the bonding effect of hemicellulose or the worry that flowability is given effect in the follow-up forming process.So, find can suppress described bad phenomenon by adjusting the moisture content of the wood materials before boiling is handled.And, find by adjusting moisture content, can suppress because the cellulose that the heating when manufacturing body causes or the thermal decomposition of lignin, and then suppress because formic acid, acetate, the formaldehyde that hemicellulose or cellulosic decomposition produce, reduce the smell of xylon molded body.
The present invention establishes for solving above-mentioned existing problem, and it thes contents are as follows:
(1) manufacture method of xylon molded body is characterized in that comprising following operation: dry wood materials is adjusted the preceding operation of adjusting of boiling of its moisture content; To adjusting the cooking process that the wood materials of moisture content carries out the boiling processing by adjusting operation before the described boiling; With the forming process that will be shaped by the wood materials that described cooking process boiling was handled.
(2) manufacture method of the xylon molded body of above-mentioned (1) is characterized in that: be adjusted to below 20% by the moisture content of adjustment operation before the above-mentioned boiling with wood materials.
(3) manufacture method of the xylon molded body of above-mentioned (1) or (2) is characterized in that: above-mentioned forming process comprises the whole forming process with the preformed preform operation of the wood materials of handling by above-mentioned cooking process boiling and the preform compression molding that will be shaped by described preform operation; After above-mentioned cooking process and before any at least operation of above-mentioned preform operation or above-mentioned whole forming process, comprise that dry above-mentioned wood materials adjusts drying process before the shaping of its moisture content.
Wherein, " before any at least operation of preform operation or whole forming process; dry wood materials " not only refers to only comprise the drying of wood materials before any operation among preform operation and the above-mentioned whole forming process, also refer to comprise before preform operation and these 2 operations of whole forming process the drying of wood materials.
(4) manufacture method of the xylon molded body of above-mentioned (3), it is characterized in that: drying process is dried to below 15% the moisture content of above-mentioned wood materials when carrying out before the above-mentioned preform operation and before the pulverizing process of pulverizing wood materials before the above-mentioned shaping; When carrying out before above-mentioned whole forming process, making the preform that is made of above-mentioned wood materials be dried to moisture content is below 2%.
(5) manufacture method of the xylon molded body of above-mentioned (3) or (4) is characterized in that: above-mentioned preform operation is that wood materials is filled in the mould, press molding under the pressure more than the 1MPa, below the 20MPa, and preform is shaped.
(6) manufacture method of the xylon molded body of above-mentioned (1), it is characterized in that: comprise with respect to 100 weight portion moulding materials comprising thermoplastic resin, in the wood materials of handling by above-mentioned cooking process boiling, add the resin interpolation operation that thermoplastic resin obtains above-mentioned moulding material with the ratio more than 5 weight portions, below 35 weight portions; Above-mentioned forming process is that the moulding material that will obtain by described resin interpolation operation is expelled in the mould, with the operation of above-mentioned xylon molded body injection moulding.
(7) manufacture method of each xylon molded body in above-mentioned (1)～(6), it is characterized in that: above-mentioned cooking process is with the top opening input of above-mentioned wood materials from the container that has the gas permeability side, and the wood materials of putting in the described container is carried out the operation that boiling is handled; The crossbearer parts that in said vesse, will be set up in the strip between the said vesse inner side be configured such that perpendicular to described parts longitudinally section with the chevron protruded towards opening above the said vesse and with the state below the open shape orientation container, above-mentioned wood materials is put in the said vesse.
(8) manufacture method of xylon molded body is characterized in that: making wood materials contact water vapour, give in the manufacture method of wood materials with the wood materials of thermal fluidity, form by steam treatment, preform, the whole shaping to wood materials; Form after adjusting the moisture content that is shaped with wood materials before steam treatment and before the shaping of preform or shaping eventually.
(9) manufacture method of the xylon molded body of above-mentioned (8), it is characterized in that: the moisture content of wood materials is adjusted to more than 3%, below 20%, it is dry so that its moisture content is more than 5%, below 15% after described wood materials is contacted water vapour, carry out preform and manufacture preform, it is to carry out compression molding below 2% afterwards that the gained preform is dried to moisture content.
(10) manufacture method of the xylon molded body of above-mentioned (8) or (9), it is characterized in that: the moisture content of wood materials is adjusted to more than 5%, below 15%, be filled in the mould press molding under the pressure more than the 1MPa, below the 20MPa, shaping preform.
(11) xylon molded body is characterized in that: this xylon molded body can be made with thermal fluidity by making wood materials contact water vapour give wood materials; By to the steam treatment of wood materials, preform, be shaped and form eventually, adjusting before preform or the shaping that is shaped eventually is shaped forms with the free water of wood materials and in conjunction with the moisture content of water.Wherein, " before preform or the shaping that is shaped eventually, adjust and be shaped " and be meant that before preform or the shaping that is shaped eventually adjustment comprises free water and in conjunction with the moisture content of the moisture in the wood materials of water with the free water of wood materials and in conjunction with the moisture content of water.
The invention effect
Manufacture method according to the xylon molded body of above-mentioned (1); dry wood materials; adjust and again wood materials is carried out boiling after its moisture content and handle, therefore have the effect that the protective coating that is not coated with varnish etc. also can provide the xylon molded body that has reduced water absorption rate or smell.
Manufacture method according to the xylon molded body of above-mentioned (2), on the basis of effect of the manufacture method of the xylon molded body of performance above-mentioned (1), by adjusting operation before the boiling, therefore the moisture content of wood materials is adjusted to below 20%, and also having to provide the effect that makes the xylon molded body that water absorption rate or smell further reduced.The equilibrium moisture content of timber (that is, only in conjunction with the moisture content of water) is 15%, therefore by moisture content is adjusted to below 20%, free water can be reduced to below 5%, can obtain higher effect for the improvement of water absorption rate or smell.
According to the manufacture method of the xylon molded body of above-mentioned (3), on the basis of the effect of the manufacture method of the xylon molded body of performance above-mentioned (1) or (2), also have and shorten the needed time that is shaped, can reach the effect of volume production.The thermal conductivity of wood materials was just low originally, and was when being made of wood powder at wood materials, because contain a large amount of air, thermal conductivity is lower.Therefore, need expend time in will be heated to the temperature of homogeneous as the wood materials of moulding material.Therefore, at first carry out the shaping of preform, make the wood materials densification by the preform operation.Preform can form at normal temperatures, is shaped with the end of needs heating and compares the processing time weak point.So, if carry out whole shaping again, can shorten heat time heating time at the shaping preform, after reducing volume and carrying out densification, obtain good work efficiency.
And owing to exist in a large number in conjunction with water in the wood materials, with the wood materials compression molding time, the moisture of wood materials inside is vaporized, and can pollute the surface of formed body or be broken to the undesirable condition of body inside etc.Therefore,, have the vaporization that can suppress the moisture in the compression molding, can obtain the effect of the moulding material of high-quality by dry wood materials before any at least operation of preform operation or whole forming process.
After preform, eventually form before being shaped before during drying process, if earlier to preform carry out a large amount of shapings, concentrate, dry, carry out whole shaping subsequently more in order, can improve efficiency of operation.
Manufacture method according to the xylon molded body of above-mentioned (4), on the basis of effect of the manufacture method of the xylon molded body of performance above-mentioned (3), moisture content by the wood materials before will pulverizing before preform is dried to below 15%, also has to suppress the effect that wood materials stops up the screen cloth mesh of pulverizer.As if the moisture content height of wood materials, then stop up the screen cloth mesh of pulverizer easily.
And, behind the preform, when from mould, taking out preform, because stress can produce the situation that preform expands.Therefore, if before whole forming process, be dried to below 2%,, has the effect in the mould that preform can be received into whole shaping usefulness because drying is shunk preform by the moisture content of drying process before being shaped with preform.And, have the vaporization that can suppress moisture in the compression molding reliably, obtain the more effect of the moulding material of high-quality.
Manufacture method according to the xylon molded body of above-mentioned (5), on the basis of effect of the manufacture method of the xylon molded body of performance above-mentioned (3) or (4), in the preform operation, the preform owing under the pressure more than the 1MPa wood materials press molding is shaped also keeps reservation shape to become the effect of the degree of preform even therefore also have wood materials is mutually combined reach at normal temperatures.And, by under the pressure below the 20MPa with the wood materials press molding, can suppress to exceed the pressurization of needs.By pressurizeing under the pressure of about 20MPa, the real density (density under voidless condition) that wood materials can be compressed into timber is about 1.45g/cm
3Density.Therefore, even apply pressure above this pressure, density also is difficult to change.
According to the manufacture method of the xylon molded body of above-mentioned (6), on the basis of the effect of the manufacture method of the xylon molded body of performance above-mentioned (1),, also has the effect of the xylon molded body that can be shaped by injection moulding.With respect to 100 weight portion moulding materials, by the component that makes thermoplastic resin is more than 5 weight portions, can on the flow effect of lignin or hemicellulose, increase the flow effect of thermoplastic resin, make moulding material have sufficient flowability, even therefore complicated structure also can injection moulding.And the component by making thermoplastic resin can reduce the use amount of resin material below 35 weight portions.At present, under the situation of worrying the mining deposits exhaustion, the preferred ratio that reduces the resin that is derived from mining deposits.
According to the manufacture method of the xylon molded body of above-mentioned (7), in performance above-mentioned (1) to (6), on the basis of the effect of the manufacture method of any xylon molded body, also has the effect of the efficient that can improve cooking process.With the crossbearer parts be configured such that perpendicular to described parts longitudinally section with the chevron protruded towards said vesse top opening.Therefore, because the chevron inclined plane of crossbearer parts, therefore the wood materials that is dropped into by the opening above the container can, after wood materials is piled up, also can form the space in the mountain top of crossbearer parts part to the landing of the both sides of crossbearer parts.So, in cooking process, be set up in the effect of the mountain top part performance steam passage of the crossbearer parts between the side with gas permeability.And described crossbearer parts have the shape open towards the below, therefore the wood materials of internal tank fully can be exposed to the steam by the crossbearer parts.
According to the manufacture method of each xylon molded body in above-mentioned (8) to (10) or the xylon molded body of above-mentioned (11); when making the formed body that forms by wood materials; be not coated with the protective coating of varnish etc.; wooden moisture content by before moisture content before the steam treatment of adjusting wood materials and the formed body shaping can provide the formed body that has reduced water absorption rate or smell.
The accompanying drawing summary
[Fig. 1] is the flow chart of the manufacture method of expression formed body of the present invention.
[Fig. 2] is the oblique view that expression is assemblied in the user mode of the ventilation servicing unit among the raw material accommodating container C (a); (b) be the front elevation of ventilation servicing unit; (c) be the side view of ventilation servicing unit.
[Fig. 3] is the result that experimental example 2 carries out water absorption test (a), is the expression forming temperature wood materials moisture content before the boiling and figure of the variation relation between the xylon molded body water absorption rate when being 180 ℃.(b) being the result who carries out water absorption test, is the expression forming temperature wood materials moisture content before the boiling and figure of the variation relation between the xylon molded body water absorption rate when being 210 ℃.
[Fig. 4] is wood materials moisture content, xylon molded body water absorption rate before the shaping of 170 ℃ of forming test sheets of expression and the figure of the relation between the expansion rate after the suction (a).(b) be wood materials moisture content, xylon molded body water absorption rate before the shaping of 190 ℃ of forming test sheets of expression and the figure of the relation between the expansion rate after the suction.(c) be preceding wood materials moisture content, the xylon molded body suction of shaping of 210 ℃ of forming test sheets of expression
The figure of the relation between the expansion rate after rate and the suction.
The explanation of symbol
Moisture content before the P2 boiling is adjusted operation (adjusting 1 example of operation before the boiling)
The P3 cooking process
Moisture content before the P4 preform is adjusted operation
P6 preform operation
Moisture content before P7 is shaped is eventually adjusted operation
The whole forming process of P8
C raw material accommodating container (1 example of container)
14 crossbearer parts
The best mode that carries out an invention
Below, describe with regard to embodiments of the present invention.Fig. 1 is the process chart of the 1st embodiment of the manufacture method of expression xylon molded body of the present invention, is the process chart of making the situation of xylon molded body by compression molding.
In the wood materials preparatory process (P1), prepare wood materials." wood materials " among the present invention is meant the ligno-cellulosic materials that all are plant-derived, for example contains lignin, hemicellulose and cellulosic ligno-cellulosic materials.And " wooden " of described wood materials is not limited to timber, also can be the material of gathering from the draft class.Described wood materials can be gathered from for example various trees such as China fir, Japan cypress, beech.Perhaps, can gather from draft classes such as mestha, corn, sugarcane, fiber crops, rush, rice.Perhaps, can gather the discarded object of grass, the fallen leaves of branch from house dismounting material, furniture dismounting material, wood chip, thinnings, rice hulls, wood powder, waste paper, pruning, harvesting, the press residue (bagasse) of sugarcane etc.Further, the lignin of discharging as discarded object in the waste paper of the fine paper that wood materials also can be by will containing lignin hardly and the pulping process mixes and obtains.Further, also can be with the combination more than 2 kinds in these wood materials.
Among the present invention, preferably use the material of the sectionalization that can contact as the wood materials of raw material use with the water vapour equalization.If with the wood materials sectionalization, not only can contact during the boiling of explanation is handled hereinafter with water vapour is impartial, can also shorten the boiling that wood materials is contacted with water vapour and handle the required time.Therefore, as wood materials, the timber of laminar or micro mist shape etc. is processed in preferred use.The sawdust that produces in the time of can directly using the cutting processing of timber or shavings etc.
In the wood materials preparation section (P1), the moisture content (dry basis) of the wood materials of preparing as raw material is preferably below 30% (hereinafter, at moisture content middle finger % (weight)).Resolving into of producing handled in boiling in wood materials if moisture content above 30%, then makes easily distributes, and is difficult for plasticization and the necessary composition of liquidation are retained in the wood materials.And, if the moisture content height causes overreaction because boiling is handled, cellulose decomposition etc. takes place, can produce lot of organic acids, make the smell of formed body strong.In order to prevent crack etc., in most cases, before timber processing, timber is positioned in the air, make moisture content reach the disposal of (the water saturation point of lumber fibre) below 30%.Therefore, derive from timber processing or the carpenter the wood chip moisture content substantially below 30%, in wood materials preparatory process (P1), can be with these as raw material supply.
The moisture content of wood materials is meant the value (=(the quality ÷ wood materials of the moisture that wood materials contains) * 100) of using percentage to represent with respect to the ratio of the described wood materials contained humidity of the adiabatic drying quality of wood materials, for example can use [heat drying formula moisture meter MX-50] (A﹠amp; D Co., Ltd. system) measures.The moisture content of following embodiment also uses same device to measure.
By will with the wood materials compression molding after water vapour contacts, can be shaped as predetermined shape.And, by will in heating, compressing with the wood materials after water vapour contacts, find that it shows plasticity and flowability, this is owing to the boiling processing is decomposed because of compositions such as lignin contained in the wood materials, hemicelluloses, the fusion owing to heat such as the lignin after the described decomposition, hemicellulose, liquidation in tissue.By with wood materials plasticization, liquidation, described wood materials can be configured as arbitrary shape as plastics by injection moulding etc.And, even the wood materials of plasticization, liquidation is temporarily solidified, also can show plasticity, flowability by heating pressurization once more.
Next, adjusting operation (P2) with regard to the moisture content before the boiling describes.Moisture content before the boiling is adjusted operation (P2) ready wood materials is carried out drying, adjusts, reduces the operation of its moisture content.The adjustment of moisture content not only can be carried out at normal temperatures but also can at high temperature be carried out, and is preferably at high temperature dry by drying machine blowing hot-air etc.
Moisture content before the boiling is adjusted in the operation (P2), and the moisture content (dry basis) of the wood materials that uses as the raw material of xylon molded body preferably is adjusted to below 20%.Be adjusted to below 20% by moisture content wood materials, make it (promptly near the equilibrium moisture content of timber, only be moisture content in conjunction with water) 15%, free water can be adjusted to below 5% the smell of the xylon molded body that can be reduced and the good result that water absorption rate is reduced.In boiling engineering (P3) after this, the steam that comes to life owing to the heating to free water is penetrated in the wood materials, the excessive decomposition that can suppress hemicellulose or lignin, the outflow of the decomposition composition that consequently can suppress to produce in the wood materials is with plasticization and liquidation and improve the necessary hemicellulose of hydrophobicity or lignin is retained in the wood materials.And, can suppress the hemicellulose that steam caused that comes to life owing to heating or the excessive decomposition of lignin to free water, thereby organic compounds such as organic acid gas such as the acetate that suppresses to produce as the product of described decomposition, formic acid and formaldehyde reduce the smell of xylon molded body.
If by the adjustment of the moisture content before boiling operation (P2), the moisture content of wood materials is adjusted to below 15%, there is not free water in the wood materials, thereby can obtains better effect.
And, for example, under 130 ℃ temperature, carry out drying by using the jacket type drying machine, the moisture content of wood materials is adjusted to below 5%, can obtain splendid effect for reducing water absorption rate and smell.Suppose in the moisture content adjustment operation (P2) before boiling that even if the moisture content of wood materials is become 0%, after taking out, wood materials absorbs airborne moisture, can reach 1～2% moisture content at short notice again from drying machine.Therefore, the desired value of the moisture content in the adjustment operation of the moisture content before the boiling (P2) also can be more than 3%.If the desired value of moisture content more than 3%, does not then need to use the expensive drying machine that possesses the formation that wood materials and air is isolated, and processing also can be carried out at short notice.
Next, describe with regard to cooking process (P3).
In the cooking process (P3),, the wood materials as raw material is contacted with the water vapour of saturated vapor or heating steam etc. in order to make the xylon molded body that forms by wood materials.Among the present invention, described processing is called boiling handles.
In the cooking process (P3), particularly, to adjust operation (P2) by the moisture content before the above-mentioned boiling and adjust the wood materials of moisture content and put in the pressure vessel of tool resistance to pressure, and in described pressure vessel, carry out boiling and handle by supply with water vapour by supply sources such as for example steam ovens with the state that is loaded in the raw material accommodating container.
During described boiling is handled, preferably make vapor (steam) temperature at the contact of the water vapour more than 180 ℃, below 230 ℃ wood materials.By wood materials is contacted with the water vapour of described temperature range, can decompose hemicellulose contained in the described wood materials, lignin etc.
By making water vapour contact reasonable time (for example tens seconds to about dozens of minutes) with wood materials, handle thereby finish boiling.When the pressure of water vapour or temperature are low, preferably prolong the time of contact of water vapour and wood materials.And, when wood materials is not segmented,, then can make efficient good if use pulverizer etc. carry out fragmentation, sectionalization.
The temperature of water vapour contacts with wood materials about tens seconds to 20 minutes by making water vapour more than 200 ℃, below 230 ℃ the time, can finish boiling and handle.In order to improve the efficient of cooking process, for example, following ventilation servicing unit 10 can be assemblied among the raw material accommodating container C and use.
Fig. 2 (a) is the oblique view that expression is assemblied in the user mode of the ventilation servicing unit 10 among the raw material accommodating container C.Shown in Fig. 2 (a), raw material accommodating container C is a cube shaped, and towards the top opening, bottom surface and side are made of mesh, have gas permeability.In cooking process (P3), from the top opening input wood materials of raw material accommodating container C.Subsequently, described raw material accommodating container C is placed the pressure vessel that is not illustrated in figure, supply with water vapour, the wood materials in the raw material accommodating container C is carried out boiling handle by for example using supply sources such as steam oven.Among Fig. 2 (a), illustration be equipped with the state of 2 ventilation servicing units 10 in the raw material accommodating container C.
Fig. 2 (b) is the front elevation of ventilation servicing unit 10, and Fig. 2 (c) is the side view of ventilation servicing unit 10.Will be from the front of the observed state of IIb direction shown in Fig. 2 (a) as ventilation servicing unit 10.
Shown in Fig. 2 (a), ventilation servicing unit 10 has following structure: promptly possess pair of posts 12 and be set up in the ladder-shaper structure of a plurality of crossbearer parts 14 between the described pair of posts 12.
The upper end of pillar 12 is bent downwardly and constitutes hook 12a.Be sticked in the edge of the opening M of raw material accommodating container C by a pair of hook 12a, pillar 12 is inboard sagging along the side of raw material accommodating container C.
Crossbearer parts 14 are elongated member, and the distance between the relative side of its length and raw material accommodating container C is roughly the same, between pair of posts 12, with the longitudinal direction vertical engagement (with reference to Fig. 2 (c)) of pillar 12.Therefore, when the servicing unit 10 of will ventilating is installed among the raw material accommodating container C, crossbearer parts 14 transverse strands are located between the side of raw material accommodating container C.Shown in Fig. 2 (c), crossbearer parts 14 are set up in the raw material accommodating container C, make perpendicular to described parts longitudinally section with the chevron protruded opening M towards raw material accommodating container C top.Therefore, if drop into wood materials under the described state above raw material accommodating container C, then wood materials can be to the landing of the both sides of crossbearer parts 14, and wood materials is difficult to be piled up in the mountain top portion under each crossbearer parts 14.Therefore, can form the space between mountain top portion under each crossbearer parts 14 and the wood materials piled up.Consequently the space of the mountain top portion of crossbearer parts 14 becomes the passage of steam.And the shape of the section longitudinally of crossbearer parts 14 is open downwards, so can make the wood materials of raw material accommodating container C inside fully be exposed to steam by the mountain top portion under the crossbearer parts 14.Therefore, can improve the efficient of cooking process (P2).
Described crossbearer parts 14 following installations: on the above-below direction of the lower end of pillar 12 and pillar 12, replace mutually with the interval of equalization and with the both sides of pillar 12.By the average like this path that steam is set, can further improve the efficient of cooking process (P3).In Fig. 2 (c),, also can be curved surface though the inclined plane of crossbearer parts 14 is illustrated as the plane.
When boiling is finished dealing with, raw material accommodating container C of taking in wood materials etc. can be discharged back under the atmospheric pressure.When use was higher than atmospheric high-pressure water vapor, both falling pressure slowly also can sharply be released into atmospheric pressure.When sharply being released into atmospheric pressure, the water vapour volume of the organization internal of wood materials sharply expands, therefore, wood materials can be ground into fibrous or Powdered etc. (hereinafter, will be called quick-fried broken to the pulverizing of wood materials) from the rapid release pressure of high pressure conditions.By quick-fried broken, can when handling, the boiling of wood materials carry out sectionalization.Wood materials is because of quick-fried broken sectionalization, thus can be in operation after this dry effectively wood materials.
Get back to Fig. 1, adjust operation (P4) with regard to the moisture content before the preform and describe.But it is not necessary operation that the moisture content adjustment operation (P4) before the preform, following pulverizing process (P5), preform operation (P6) and the preceding moisture content that is shaped are eventually adjusted operation (P7), can according to circumstances omit.
After finishing dealing with as the boiling of the processing that makes wood materials contact water vapour, adjust the dry wood materials of operation (P4) by the moisture content before the preform, adjust its moisture content.It is below 15% that preferred dry wood materials makes its moisture content.This is because if the moisture in the wood materials is particularly a lot of in conjunction with water, then with the wood materials compression molding time, moisture can take place from the wood materials interior evaporation, pollutes the surface of formed body or is broken to the undesirable condition of body inside etc.The desired value that moisture content before the preform is adjusted the moisture content in the operation (P4) is getting final product more than 3%.In the case, do not need to use the expensive drying machine that possesses the formation that wood materials and air is isolated.
Next, describe with regard to pulverizing process (P5).
After adjusting operation (P4) and make the wood materials drying that boiling handled by the moisture content before the preform, as required, preferred further enforcement is ground into wood materials the operation (pulverizing process) of trickle shape.Though according to circumstances can omit described pulverizing process (P5), by pulverizing the further miniaturization of wood materials, described wood materials is easy to show flowability and plasticity when pressurizeing in heating.In order to pulverize the wood materials that boiling was handled, can use for example pulverizing means of ウ ィ レ-ミ Le (Wiley mill), ball mill, boundary's thunder machine, mixer etc.
In the present embodiment, to describing by the method for the wood materials compression molding being made xylon molded body, but when the wood materials after using pulverizing carries out extrusion molding or injection moulding, if consider the melt flows that is used for extrusion molding or injection moulding, below the preferred 800 μ m of the particle diameter of wood materials, more preferably below the 200 μ m.
Next, describe with regard to preform operation (P6).
In preform operation (P6), wood materials is carried out described wood materials being carried out preform manufacturing preform after boiling handles.The wood materials of boiling being handled by described operation is pre-formed into the degree that can keep reservation shape.For with wood materials " preform ", but working pressure machine etc. are with the wood materials compression molding.For example, the wood materials compression molding that can use mould that boiling was handled.
Below the preferred 1.0MPa of the pressure condition of preform operation, more than the 20MPa.By under the pressure more than the 1.0MPa with the wood materials compression molding, wood materials is mutually combined reach the degree that can keep reservation shape.And, pressure is set at below the 20MPa, therefore needn't apply the pressure that exceeds needs.Preferred pressure condition is more than the 1.5MPa, below the 8MPa.If use described pressure, can be with the wood materials preform under pressure more suitably.
Because wood materials contains a large amount of air, thermal conductivity is low.Therefore, if the heating wood materials in the formed body compression molding, need expend time in but then make wood materials reach forming temperature.Therefore, in the present embodiment, in whole forming process (P8) preform operation (P6) is set before, by carrying out preform at normal temperatures, the volume that reduces wood materials carries out carrying out whole shaping again after the densification, improves heat transfer efficiency, shortens curring time.
Even also can make preform at normal temperatures, therefore need not heat wood materials.Yet, before with the wood materials preform, can be the situation that in described wood materials, adds a spot of thermosetting resin as required, or according to other needs, with wood materials compression molding in heating, shaping preform.Described heating-up temperature is preferred more than 80 ℃, below 120 ℃.
Next, the moisture content adjustment operation (P7) that just is shaped preceding eventually describes.
Moisture content adjustment operation (P7) before being shaped eventually is meant passed through the drying machine drying before inserting preformed formed body in the whole shaping dies, adjust the operation of the moisture content (dry basis) of wood materials.The moisture content of wood materials is adjusted to below 2%, preferred below 1%.
In the described operation, use dehumidifying heat pump, remain on below the predetermined value for moisture content simultaneously, dehumidifying heat pump is connected with forming machine, also can utilize the mechanism of direct supply preform with pneumatic hose with preform.
If operate by above-mentioned, though when preform takes out from mould owing to stress expands, by removing moisture, also can dwindle preform, in whole forming process, preform can be accommodated in the mould then.
Next, the whole forming process (P8) with the preform compression molding is described.
For preform is carried out whole shaping, can be by forcing press etc. with the preform compression molding.For example, preform can be placed in the inside of mould, under high pressure described preform being pressurizeed prepares whole formed body.
Described as required whole formed body can also be by preparing preform compression molding in heating.
In whole forming process (P8), the pressure condition during with the preform compression molding is more than the 10.0MPa, below the 40.0MPa.In addition, be more than 160 ℃, below 230 ℃ with preform heating condition during compression molding in heating.That is,, can prepare the surface as the level and smooth and glossiness whole formed body of plasticlike by under the described conditions with the preform compression molding.
According to the present invention, can use the formed body that forms by wood materials to replace the existing parts that form by metal or engineering plastics etc.Therefore, effective utilization of not only can promote all the time all the to go out of use waste material handled or thinnings etc., also because wood materials can biodegradation in soil, processings of need not burning, so can expect to reduce the effect of emission amount of carbon dioxide.
Next, the 2nd embodiment to the manufacture method of xylon molded body of the present invention describes.In the manufacture method of the 2nd embodiment, the enforcement of adjusting operation (P2), cooking process (P3) owing to the wood materials preparatory process (P1) that describes with reference to Fig. 1, the preceding moisture content of boiling is identical with the manufacture method of the 1st embodiment, therefore omits explanation.
Next, in the wood materials that boiling was handled, add thermoplastic resin, make with respect to 100 weight portion moulding materials and contain thermoplastic resin, obtain moulding material (resin interpolation operation) with the ratio more than 5 weight portions, below 35 weight portions.According to described moulding material,, can contain the wood materials that 65 weight portions are above, 95 weight portions are following with respect to 100 weight portion moulding materials.
Making the component of thermoplastic resin with respect to 100 weight portion moulding materials is more than 5 weight portions, can on the flowability that derives from lignin or hemicellulose, increase the flowability of thermoplastic resin thus, make moulding material have sufficient flowability, even therefore complicated structure also can injection moulding.And the component by making thermoplastic resin can reduce the use amount of resin material below 35 weight portions.As thermoplastic resin, preferably use for example olefin-based resin, PLA, acrylic resin, the thermoplastic elastomer (TPE) of polypropylene, polyethylene etc.Especially preferably use forming temperature to be about 200 ℃ olefin-based resin.But wood materials liquidation under about 200 ℃ temperature, but, may produce harmful effect to xylon molded body if heating-up temperature far above described temperature, then can produce decomposition gas.
Moisture content can carry out shaping shown in Figure 1 before resin adds operation before is adjusted operation (P4).And, as required, also can before adding operation, resin carry out pulverizing process shown in Figure 1 (P5).
Next, make the moulding material that has mixed thermoplastic resin solidify, pulverize, be formed on the form that can drop in the injection process after this thus.As the form that in injection process, can drop into, for example can enumerate sheet (tip), laminar, partical, blank shape (tablet) etc.For example, can be that long limit is that the following laminar or long limit of 1.5mm is the following sheet of 5.0mm, partical or the blank shape that diameter is about 5.0mm.As required, moulding material further can also be ground into trickle shape.When pulverizing moulding material, can use for example pulverizing means of ウ イ レ-ミ Le, ball mill, boundary's thunder machine, mixer etc.
Next, carry out injection forming process (1 example of forming process).In injection forming process, utilize injection device that plasticization is carried out in moulding material pressurization in heating, by under predetermined injection pressure, being expelled in the mould injection moulding xylon molded body.Ram temperature is 180 ℃, and mold temperature is for example 100 ℃, and injection pressure is for example 16MPa.As injection machine, can use for example 200 tons of horizontal injection forming machines of HAITIAN HTF-200X.
Preferred 180 ℃～230 ℃ of the heating-up temperature of moulding material.By making heating-up temperature, can improve the thermal fluidity that makes wood materials, even complicated structure also can injection moulding more than 180 ℃.And, by making heating-up temperature below 230 ℃, can suppress decomposition gas that the decomposition owing to hemicellulose etc. produces and the shaping that produces owing to decomposition gas bad.
Can suitably adjust heating-up temperature according to the kind of material.For example, when using coniferous tree such as Chinese fir as host material (as the material on basis), preferred 200 ℃～210 ℃ of heating-up temperature.On the other hand, the broad leaf tree of using maple etc. is during as host material, preferred 180 ℃～200 ℃ of heating-up temperature.
Manufacture method according to the xylon molded body of the 2nd embodiment can obtain the effect identical with the manufacture method of the 1st embodiment.That is, adjust operation, can keep hemicellulose wooden in the cooking process or lignin, do not make the outflow of its surplus through the moisture content before the boiling.Therefore, can think relevant with following principle, polymerization takes place in the heating pressurization when promptly hemicellulose that decomposes owing to boiling or lignin are by injection moulding, improves hydrophobicity, thereby has improved water absorption rate.
And, according to the 2nd embodiment, because the mixing of resin can further improve flowability, therefore, even, also can will contain the xylon molded body injection moulding of a large amount of wood materials as complicated structure as the gear.
Embodiment
Below, just the embodiment that further the present invention is specialized describes.Below Shuo Ming embodiment 1 and embodiment 2 are the overall processes through the operation shown in Figure 1 that does not contain pulverizing process (P5), with the example of xylon molded body compression molding.And embodiment 3 to embodiment 5 adjusts the overall process of operation (P4) to the operation shown in Figure 1 of preform operation (P6) through not containing from the moisture content before the preform, with the example of xylon molded body compression molding.
At first, prepare the sawdust when wood-working factory's sawing China fir, produce wood powder as raw material-wood materials.Adjust the moisture content to 12% of described wood materials.Subsequently, after 215 ℃ of following boilings were handled 6 minutes, carrying out drying, to make the moisture content of wood powder be 8%.Subsequently,, be shaped for 30 seconds, obtain preform in the pressure lower compression of room temperature, 20MPa with described Wood flour filled in the shaping dies of φ 140mm.Once more described preform is placed in the shaping dies of φ 140mm, was shaped 2 minutes in the condition lower compression of 30MPa.The surface of the xylon molded body that obtains by described operation does not have because the stain that the generation of gas forms is the formed body with gloss.Soak water absorption rate in 24 hours also below 1%, and do not have the organic acid smell.
The shavings of preparing the Japan cypress material is as formed body raw material-wood materials.Adjust the moisture content to 12% of described wood materials.Subsequently, after 215 ℃ of following boilings are handled 6 minutes, fill it in the shaping dies of φ 140mm, be shaped 3 minutes, obtain preform in the pressure lower compression of room temperature, 30MPa.Once more described preform is placed in the shaping dies of φ 140mm, was shaped 2 minutes at 200 ℃, the condition lower compression of 30MPa.In this case, it is low also can to obtain water absorption rate, and organic acid produces few formed body.
Comparative example 1
In comparative example 1,, make the moisture content of described material rise to 100% in wood materials, to add the moisture content adjustment operation (P2) before water replaces boiling shown in Figure 1.Subsequently, after 200 ℃ of following boilings were handled 20 minutes, the internal diameter that is filled into mould was in the shaping dies of φ 140mm with described wood materials, was shaped 3 minutes at 180 ℃, the condition lower compression of 30MPa.
Experimental example 1
In order to verify effect of the present invention, measure the smell of the xylon molded body that derives from embodiment 1,2 and comparative example 1.Particularly, mensuration is as the organic acid amount of diffusing in the source of smell.Table 1 expression is by the acetate of each xylon molded body of embodiment 1,2 and comparative example 1 preparation, the amount of the diffusing μ g/L of formic acid.
Table 1
| Acetate (μ g/L) | Formic acid (μ g/L) | |
| |
<0.5 | 0.6 |
| |
<0.5 | 0.8 |
| Comparative example | 9.2 | 10.2 |
As shown in Table 1, according to before cooking process, the moisture content of wood materials being adjusted to the embodiment 1,2 that forms after 8%, 12% respectively,, can obtain the little xylon molded body of smell because the organic acid amount is few.With inferior opposite, before boiling, do not carry out in the dry comparative example 1, produced acetate, the formic acid in a large amount of sources as smell.And, according to embodiment 1,2, can also obtain the glossiness xylon molded body of surface smoothing.
As sensory testing, sex and 10 all different people of age have been carried out the test of smell, the result is that 10 people all do not feel offending smell.
At first, preparation use broad leaf tree is cut the wood chip (composite material of maple and Chinese ash) of system bat generation as formed body raw material-wood materials, and dry described wood materials is adjusted its moisture content (the moisture content adjustment operation (P2) before the boiling).
Subsequently, handle (P3), the condition lower compression of wood materials at 180 ℃ of heating-up temperatures, pressure 30MPa was shaped 2 minutes, make xylon molded body through boiling.
In embodiment 3, the moisture content before the boiling is adjusted in the operation (P2), use drying machine that the moisture content of wood materials is adjusted to 3% after, the shaping xylon molded body is called sample S3-1 with described xylon molded body.And the moisture content before boiling is adjusted in the operation (P2), and after just the moisture content of wood materials was adjusted to 15% by the air drying, the shaping xylon molded body was called sample S3-2 with described xylon molded body.
Comparative example 2
In the comparative example 2,, the moisture content of described material is risen in wood materials, to add the moisture content adjustment operation (P2) before water replaces boiling.Other operation is identical with embodiment 3.Wherein, the sample that adds the water of 130% (weight) and obtain in wood materials is called comparative sample H2-1, the sample that adds the water of 200% (weight) and obtain in wood materials is called comparative sample H2-2.
Experimental example 2
Under 23 ℃ condition, based on the K7209A method of JIS each sample that derives from embodiment 3 and comparative example 2 is carried out water absorption test respectively, it the results are shown in Fig. 3 (a).Shown in Fig. 3 (a), to compare with comparative sample H2-1, the H2-2 of the comparative example 2 that before boiling, added water, the water absorption rate that moisture content is reduced to sample S3-1, the S3-2 of the embodiment 3 below 15% before boiling reduces.And if the sample S3-1 of comparing embodiment 3, the experimental result of S3-2, it is lower to recognize that before boiling moisture content with wood materials is reduced to the water absorption rate of 3% sample S3-1, and effect is more obvious.
The foregoing description 3, comparative example 2 are shapings of carrying out xylon molded body under 180 ℃, and the forming temperature of embodiment 4, comparative example 3 is 210 ℃.And embodiment 4 is only different with embodiment 3 on forming temperature, and other condition is identical with embodiment 3.Equally, comparative example 3 is only different with comparative example 2 on forming temperature, and other condition is identical with comparative example 2.
In embodiment 4, the moisture content before the boiling is adjusted in the operation (P2), use drying machine that the moisture content of wood materials is adjusted to 3% after, the shaping xylon molded body is called sample S4-1 with described xylon molded body.And the moisture content before boiling is adjusted in the operation (P2), and after just the moisture content of wood materials was adjusted to 15% by the air drying, the shaping xylon molded body was called sample S4-2 with described xylon molded body.
And, the sample that adds the water of 130% (weight) and obtain in wood materials is called comparative sample H3-1 for comparative example 3, the sample that adds the water of 200% (weight) and obtain in wood materials is called comparative sample H3-2.
Experimental example 3
Next, the experiment of the relation between the water absorption rate of the moisture content of wood materials and xylon molded body being carried out with regard to inventor etc. describes.Experiment 3 is identical with experiment 2, under 23 ℃ condition, carries out the water absorption test of water logging in 24 hours bubble based on the K7209A method of JIS.Experiment 3 the results are shown in Fig. 3 (b).By Fig. 3 (b) as can be known, be that each sample S3-1, the S3-2 of 180 ℃ experiment 2 compares (with reference to Fig. 3 (a)) with forming temperature, forming temperature is that the water absorption rate of each sample S4-1, S4-2 of 210 ℃ experiment 3 reduces.Therefore, can obtain to draw a conclusion: promptly, forming temperature is high more, can reduce water absorption rate more.
The boiling under the cooking pressure of 1.8MPa, 220 ℃ boiling temperature of the wood powder of yellow poplar was handled 20 minutes, subsequently, under moulding pressure 25MPa, 80 ℃ of mold cools down temperature, the hot pressing condition of 3 minutes heat time heating times, carry out compression molding, being shaped obtains 12 test films that formed by xylon molded body.Each test film is called test film No.i (i is 1～12 integer) to show differentiation.Test film No.1～4th is shaped under 170 ℃ forming temperature.Test film No.5～8th is shaped under 190 ℃ forming temperature.And test film No.9～12nd is shaped under 210 ℃ forming temperature.And the moisture content before the shaping of each test film has nothing in common with each other.
Experimental example 4
Next, use the relation between the water absorption rate of the moisture content of the wood materials before the test film No.1～12 pair shaping derive from embodiment 5 and forming temperature and xylon molded body to experimentize.Experiment 4 is identical with experiment 2, under 23 ℃ condition, carries out the water absorption test of water logging in 24 hours bubble based on the K7209A method of JIS.
Fig. 4 is the figure of the result of the test of expression experiment 4.By Fig. 4 (a)～Fig. 4 (c) as can be known, there is tangible dependency relation between the expansion rate after the water absorption rate of xylon molded body and the suction, but do not have tangible dependency relation between the water absorption rate of moisture content before being shaped and xylon molded body and between the expansion rate after moisture content before being shaped and the suction.Therefore, according to experimental result shown in Figure 3 and experimental result shown in Figure 4 as can be known, in order to improve water absorption rate, compare with the moisture content of adjusting before being shaped, the moisture content of adjusting before boiling is handled is more important.
And, Fig. 4 (a) is the experimental result that is illustrated in 170 ℃ the following test film group that is shaped of forming temperature, Fig. 4 (b) is the experimental result that is illustrated in 190 ℃ the following test film group that is shaped of forming temperature, and Fig. 4 (c) is the experimental result that is illustrated in 210 ℃ the following test film group that is shaped of forming temperature.By these results as can be known, forming temperature is high more, can reduce water absorption rate more, also can reduce the expansion rate after absorbing water more.
Claims (11)
1. the manufacture method of xylon molded body is characterized in that comprising following operation: dry wood materials is adjusted operation before adjusting the boiling of its moisture content; To adjusting the cooking process that the wood materials of moisture content carries out the boiling processing by adjusting operation before the described boiling; With the forming process that will be shaped by the wood materials that described cooking process boiling was handled.
2. the manufacture method of the xylon molded body of claim 1 is characterized in that: adjust before above-mentioned boiling in the operation, the moisture content of wood materials is adjusted to below 20%.
3. the manufacture method of claim 1 or 2 xylon molded body is characterized in that: above-mentioned forming process comprises the whole forming process with the preformed preform operation of the wood materials of handling by above-mentioned cooking process boiling and the preform compression molding that will be shaped by described preform operation; After above-mentioned cooking process and before any at least operation of above-mentioned preform operation or above-mentioned whole forming process, comprise that dry above-mentioned wood materials adjusts drying process before the shaping of its moisture content.
4. the manufacture method of the xylon molded body of claim 3, it is characterized in that: drying process is dried to below 15% the moisture content of above-mentioned wood materials when carrying out before the above-mentioned preform operation and before the pulverizing process of pulverizing wood materials before the above-mentioned shaping; When carrying out before above-mentioned whole forming process, making the preform that is made of above-mentioned wood materials be dried to moisture content is below 2%.
5. the manufacture method of claim 3 or 4 xylon molded body, wherein above-mentioned preform operation is that wood materials is filled in the mould, press molding under the pressure more than the 1MPa, below the 20MPa, preform is shaped.
6. the manufacture method of the xylon molded body of claim 1, it is characterized in that: comprise with respect to 100 weight portion moulding materials comprising thermoplastic resin, in the wood materials of handling by above-mentioned cooking process boiling, add the resin interpolation operation that thermoplastic resin obtains above-mentioned moulding material with the ratio more than 5 weight portions, below 35 weight portions; Above-mentioned forming process is that the moulding material that will obtain by described resin interpolation operation is expelled in the mould, with the operation of above-mentioned xylon molded body injection moulding.
7. each the manufacture method of xylon molded body of claim 1 to 6, it is characterized in that: above-mentioned cooking process is with the top opening input of above-mentioned wood materials from the container that has the gas permeability side, and the wood materials of putting in the described container is carried out the operation that boiling is handled; The crossbearer parts that in said vesse, will be set up in the strip between the said vesse inner side be configured such that perpendicular to described parts longitudinally section with the chevron protruded towards opening above the said vesse and with the state below the open shape orientation container, above-mentioned wood materials is put in the said vesse.
8. the manufacture method of xylon molded body is characterized in that: making wood materials contact water vapour, give in the manufacture method of wood materials with the wood materials of thermal fluidity, form by steam treatment, preform, the whole shaping to wood materials; Form after adjusting the moisture content that is shaped with wood materials before steam treatment and before the shaping of preform or shaping eventually.
9. the manufacture method of the xylon molded body of claim 8, it is characterized in that: the moisture content of wood materials is adjusted to more than 3%, below 20%, it is dry so that its moisture content is more than 5%, below 15% after described wood materials is contacted water vapour, carry out preform and prepare preform, it is to carry out compression molding below 2% afterwards that the gained preform is dried to moisture content.
10. the manufacture method of the xylon molded body in the claim 8 or 9, this preparation method is that the moisture content with wood materials is adjusted to more than 5%, below 15%, be filled in the mould, press molding under the pressure more than the 1MPa, below the 20MPa, preform is shaped.
11. xylon molded body is characterized in that: this xylon molded body can be made with thermal fluidity by making wood materials contact water vapour give wood materials; By to the steam treatment of wood materials, preform, be shaped and form eventually, can adjust before preform or the shaping that is shaped eventually is shaped forms with the free water of wood materials and in conjunction with the moisture content of water.
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| JP2007291298 | 2007-10-12 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104511958A (en) * | 2013-10-01 | 2015-04-15 | 小岛冲压工业株式会社 | Formed ligneous body, and method of producing the same |
| CN113696297A (en) * | 2021-08-20 | 2021-11-26 | 广州厚邦木业制造有限公司 | Floor board preparation process using composite material as core board and floor board |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5481623B2 (en) * | 2010-02-12 | 2014-04-23 | シヤチハタ株式会社 | Wood resin composition and wood pellet |
| JP6592819B2 (en) * | 2015-05-15 | 2019-10-23 | トヨタ紡織株式会社 | Wood board and manufacturing method thereof |
| JP6528670B2 (en) * | 2015-12-15 | 2019-06-12 | トヨタ車体株式会社 | Method of manufacturing molded article |
-
2008
- 2008-09-17 JP JP2008237553A patent/JP2009107331A/en active Pending
- 2008-10-13 CN CNA2008101660520A patent/CN101428431A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104511958A (en) * | 2013-10-01 | 2015-04-15 | 小岛冲压工业株式会社 | Formed ligneous body, and method of producing the same |
| US9511518B2 (en) | 2013-10-01 | 2016-12-06 | Kojima Industries Corporation | Formed ligneous body, and method of producing the same |
| CN113696297A (en) * | 2021-08-20 | 2021-11-26 | 广州厚邦木业制造有限公司 | Floor board preparation process using composite material as core board and floor board |
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