CN103600380A - Plasticized scrimber made of bamboo and wood with mould self-generation treatment - Google Patents
Plasticized scrimber made of bamboo and wood with mould self-generation treatment Download PDFInfo
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- CN103600380A CN103600380A CN201310594927.8A CN201310594927A CN103600380A CN 103600380 A CN103600380 A CN 103600380A CN 201310594927 A CN201310594927 A CN 201310594927A CN 103600380 A CN103600380 A CN 103600380A
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Abstract
The invention discloses a plasticized scrimber made of bamboo and wood with mould self-generation treatment and relates to a process for producing the plasticized scrimber made of the bamboo and the fast-growing wood with mould self-generation treatment. The process includes the steps 1), allowing a bamboo bundle and a wood bundle to naturally mould for 2-3 days under an environment liable to mould growth or till a weight loss ratio reaches 10-15%; 2), subjecting the mouldy bamboo bundle and the wood bundle to mould removing cleaning and drying; 3), soaking dried bamboo bundle and wood bundle in phenolic resin glue different in molecular weight prior to drying till to be 6-14% in moisture content; 4), paving and pressing to obtain a finished plate. The plasticized scrimber has the advantages of being large in material density, high in strength, good in tenacity, good in dimensional stability, anticorrosive, resistant to insects, large in resistance and higher than an ordinary scrimber in strength. The plasticized scrimber can be used for outdoor decks in an architectural structure, automobile dies, train base plates, bearing materials and the like.
Description
Technical field
What the present invention relates to is a kind of method that adopts spontaneous mould to process bamboo wood and fast growing wood manufacture plasticizing recombinant material, belongs to the wood-based plate manufacturing technology field in wood working industry.
Background technology
Bamboo wood is rich in the nutriments such as starch and is easy to go mouldy because of it, fast growing wood also easily attracts the infringement of stain fungus.The biohazard initial stage of mould is almost on not impact of material, just influential to presentation quality.Owing to going mouldy, make us being difficult to accepting, people stop the generation of going mouldy by various technology, and but having ignored goes mouldy can improve the permeability of bamboo wood and timber, and the initial stage of especially going mouldy does not affect this advantage to fundamental strength.Based on this principle, the present invention utilizes the effect of going mouldy of spontaneous mould, improves bamboo wood permeability, increases resin impregnation, has designed the bamboo wood bundle plasticizing recombinant material that impregnation is suppressed again after naturally going mouldy.The plasticizing recombinant material intensity that this method is manufactured is larger, and water proofing property is better, and density reachable is to 1.2-1.35g/cm
3, not only can be used as construction timber, can also be used as automobile die, the manufacture of housing pressing mold, and bearing, bush material etc.
Summary of the invention
What the present invention proposed is a kind of method that adopts spontaneous mycotic culture to process bamboo wood and fast growing wood manufacture plasticizing recombinant material, its objective is bamboo wood and fast growing wood are made to easy-to-handle pencil unit, by spontaneous mould, process, improve unit permeability, and then with pf resin of low molecular weight to wooden Shu Jinhang soaking, pass through again higher molecular weight phenolic resins to bamboo bundle impregnation, after dry hot pressing, make highdensity plasticizing recombinant material.The plasticizing recombinant material of this technology manufacture both can be used for construction material, also can be used for bearing, bush material, also can be used for wear-resisting and shock proof die-pressing section for car and boat manufacture.
Technical solution of the present invention: adopt spontaneous mould to process the method for bamboo wood and fast growing wood manufacture plasticizing recombinant material, comprise following processing step:
1) fresh mao bamboon material and fast growing wood are rolled into the bamboo bundle that thickness is less than 2mm, bamboo bundle and wooden bundle can be through being processed into thin microscler, laterally to separate continuous bamboo and wood bundle sheet can be also narrower single bamboo and wood bundle, width should be the more than 4 times of thickness, and thickness is less than 2mm, bamboo bundle and wood bundle are microsclerly conducive to mould within the shortest time for thin, be penetrated into 30% of bamboo bundle and wooden Shu Houdu, and consume nutriment and not deface and intensity; Thickness is greater than the bamboo wood bundle fungus growth of 2mm to 30% overlong time, easily causes surface strength and destroys, thereby reduce bamboo wood Shu Benshen intensity, and the moisture content of the bamboo bundle that processing obtains and wood bundle is answered more than 15%;
2) in above-mentioned bamboo and wood Shu culturing room, carry out mould and naturally cultivate, humidity 90 ± 5%, temperature 25-35 ℃, the time is that after 2-3 days, stopping or the maximum over dry weight-loss ratio 8-15% of bamboo wood bundle appears in surface mould; While avoiding weight-loss ratio excessive, inner generation degraded, and causes bamboo wood beam intensity to decline, and reduces manufactured goods intensity; According to the characteristic of going mouldy of different fast growing wood seeds, regulate humiture and time, to the fast growing wood that is difficult in a short time going mouldy, can omit this step, directly carry out next step; Rotproofness good fast-growing Chinese fir do not need mycotic culture, can be directly mix use with the bamboo bundle going mouldy after processing;
3) the bamboo bundle after going mouldy and wood are restrainted into the washing of 0.5-1% sodium acid carbonate, removed the mycelia of surface attachment and metabolite thereof and the intensity of damaging cells wall not; To the fast growing wood of processing without spontaneous mould, if timber self contains resin or the more assortment of inclusion, adopt the extracting of 0.5-1% NaOH to process; After above-mentioned processing, bamboo wood bundle is dried to moisture content 12-14%; Dried wood bundle, adopt solid content 33-70%, pH value 7-8.7, host molecule amount is the pf resin of low molecular weight impregnation of 500-850, bamboo Shu Caiyong molecular weight 1500-2800, solid content is impregnation after one times of the phenolic resins dilution of 45-60%, dilutes one times of liquid-solid ratio while having increased impregnation process, is conducive to glue being uniformly distributed on bamboo bundle surface; Wood Shu Caiyong is low-molecular-weight can increase cell membrane infiltration, improves cell wall hardness, makes the hardening of software wood bundle, is to strengthen to process; The phenolic resins that bamboo Shu Caiyong molecular weight is higher utilizes larger molecule to strengthen macroscopical cell membrane parcel property, it is processing toughness reinforcing and that strengthen, the toughness that has retained bamboo wood, plasticizing recombinant material after processing has advantages of high-strength and high ductility like this, avoided that unimodal molecular weight processes the shortcoming of single enhancing toughness deficiency; After impregnation, drain glue gain in weight 18-35%; 50-80 ℃ is dried to moisture content 6-14%, moisture content 10-14% as skin-material, moisture content 6-10% as core material, while being beneficial to hot pressing, the steam-energy rapid osmotic on top layer is to sandwich layer, form the technique of steam injection pressing, greatly shorten hardening time, prevent the long superficial charring of hot pressing time simultaneously;
4) impregnation dry after in a certain proportion of layer of bamboo wood Shu Jinhang or interlayer mixings assembly can pressing board length direction orientation or mat formation at random and be pressed into plate; Paving structure comprises following five types: 1) bamboo bundle is upper and lower surface layer, and wood bundle is three layers of parallel orientation structure of sandwich layer; 2) the upper and lower surface layer of bamboo bundle, sandwich layer is that three layers of bamboo wood bundle mixing orientation are parallel to structure; 3) wood bundle is upper and lower surface layer, three layers of parallel orientation structure that bamboo bundle is sandwich layer; 4) wooden bundle as upper and lower surface layer, sandwich layer is that three layers of bamboo wood bundle mixing orientation are parallel to structure; 5) after bamboo bundle and wood bundle mix, parallel orientation or random paving structure;
5) by the slab of the above-mentioned moulding of mating formation at 140-150 ℃, pressure 8.0-20MPa, time: 1.1-1.8min/mm is hot pressed into plate or the employing heat cure moulding of colding pressing, the plasticizing recombinant material ageing-resistant performance that this heat pressing process is made is better, high and low temperature resistance is better, and in-130 ℃ of-130 ℃ of temperature, performance is more stable;
Cold pressing curing, that the bamboo bundle of impregnation and wood bundle are dried to 150 ℃, before resin solidification, proceed to immediately cold press, under 8.0-10.0MPa pressure, be pressed into mould pressurize, pressing mold is fixedly heated to resin solidification, the cooling rear taking-up finished product of pressing mold, finished product needs health 7 days above with balance internal moisture, discharges internal stress.The product density that pressure presses out lower than 8.0MPa does not reach plasticizing density, hypertonia is densification too early, hinder the discharge of this moisture, while making the later stage be heating and curing moulding, in sheet material, local moisture cannot be discharged smoothly and glue together bad, cold pressing heat cure mainly for the production of shaped form moulded parts, and it is better that cold-press process goes out efficiency height and the shape conservation rate of curve parts.
Advantage of the present invention: bamboo wood and fast growing wood roll when fresh state makes pencil unit, kept the unimpeded of pit passage, adopt spontaneous mycotic culture to improve the permeability of bamboo bundle and wood bundle, improved resin penetrating power, the plasticizing recombinant material density made is large, intensity is high, good toughness, good stability of the dimension, strength ratio common wood are high; There is better high low temperature intensity and resistance to elevated temperatures, the higher reliability of tool in-130 ℃ of-130 ℃ of temperature ranges; Can be used for the outdoor use deck that building structure is used, automobile die, train backing plate, bearing material etc.
The specific embodiment
Embodiment 1:
Adopt spontaneous mould to process the method for bamboo wood and fast growing wood manufacture plasticizing recombinant material, comprise following processing step:
1) adopt fresh mao bamboon radial thin bamboo strip to roll well-thought-out plan bundle, width is wall thickness, and length is 50-220cm, the thin rectangular bamboo bundle that thickness is 0.35-2.00mm; With fresh poplar sawn timber leftover pieces or brush wood, roll out the poplar wood bundle of equal-specification, as the Component units of plasticizing recombinant material;
2) in above-mentioned bamboo and wood Shu culturing room, carry out mould and naturally cultivate, humidity 90 ± 5%, temperature 25-35 ℃, cultivating appears stopping for latter 2 days in surface mould, takes out;
3) the bamboo bundle after going mouldy and wood are restrainted into 0.75% sodium acid carbonate washing, after processing, be dried to moisture content 12-14%; Dried wood bundle, adopts solid content 33%, pH value 7-8.7, and the pf resin of low molecular weight impregnation of host molecule amount 500-850, bamboo Shu Caiyong molecular weight 1500-2000, the phenolic resins impregnation that solid content is 45-60%, drains after impregnation, glue rate of body weight gain 20%;
4) the bamboo bundle after impregnation and wood bundle are dried to moisture content 6-14%, the moisture content 10-14% of skin-material, core material 6-10% under 50-80 ℃ of condition; After dry, bamboo wood is restrainted according to 2: 1 three layers of parallel orientations of weight ratio or evenly mixes assembly, pressing board length direction orienting spreading;
5) by the slab of the above-mentioned moulding of mating formation at 140-150 ℃, pressure 8.0-10MPa, the time: 1.2-1.8min/mm is hot pressed into plate, the cooling rear ejecting plate of step-down, the plasticizing recombinant material temperature tolerance that hot pressing is produced is good, thermal creep is less.
The physical and mechanical property of plate is as follows:
Size: 1220 * 2440 * 10-22mm
The averag density of plate: 1.2-1.35g/cm
3
MOR
//：≥100MPa
MOR
⊥：≥30MPa
MOE
//：≥11000MPa
MOE
⊥：≥3500MPa
Embodiment 2:
1) fresh cizu is that raw material is made bamboo bundle, and wood bundle is fast-growing masson pine with material;
2) bamboo Shu Zisheng mycotic culture is the same; Pinus massoniana bundle, adopts 1%NaOH degreasing, bamboo bundle and the about 15-18% of wood bundle moisture content:
3) the bamboo bundle after going mouldy and pinus massoniana bundle are entered to 0.75% sodium acid carbonate washing, after processing, be dried to moisture content 12-14%; Dried wood bundle, adopts solid content 33%, pH value 7-8, and the pf resin of low molecular weight impregnation that host molecule amount is 500-650, bamboo Shu Caiyong molecular weight 2000-2500, the phenolic resins impregnation that solid content is 45-60%, drains after impregnation, glue rate of body weight gain 20-25%; Bamboo bundle and wood bundle are under 50-80 ℃ of condition, and pneumatic conveying drying is to moisture content 6-14%, the moisture content 10-14% of top layer bamboo bundle, sandwich layer pinus massoniana bundle moisture content 6-10%;
4) the dry rear bamboo wood bundle of impregnation is according to weight 1:1 proportioning, and bamboo bundle is on upper and lower top layer, and pinus massoniana bundle is at sandwich layer pressing board length direction orienting spreading; Bamboo bundle and wood bundle are dried to 140-150 ℃, when resin is uncured, sends into mould and cold pressing, pressure 8.0-10.0MPa, fixedly after patrix, heating mould or send into heating clamber curing molding, heating-up temperature 110-120 ℃, time 5-10min/mm, solidify cooling after, remove mould and take out goods; It is better that this technique extrudes efficiency height and the shape conservation rate of curve parts.
Embodiment 3:
1) adopt the fresh tangential cizu thin bamboo strip to roll well-thought-out plan bundle, width 5-18mm, length is 50-220cm, the thin rectangular bamboo bundle that thickness is 0.35-2.00mm, goes blue or green de-etiolation; With fresh poplar sawn timber leftover pieces or brush wood, roll out the poplar wood bundle of equal-specification, as the Component units of plasticizing recombinant material;
2) in above-mentioned bamboo and wood Shu culturing room, carry out mould and naturally cultivate, humidity 90 ± 5%, temperature 25-35 ℃, cultivating appears stopping for latter 2 days in surface mould, takes out;
3) the bamboo bundle after going mouldy and wood are restrainted into 0.75% sodium acid carbonate washing, after processing, be dried to moisture content 12-14%; Dried wood bundle, adopts solid content 33%, pH value 7-8.7, and the pf resin of low molecular weight impregnation of host molecule amount 500-850, bamboo Shu Caiyong molecular weight 1500-2000, the phenolic resins impregnation that solid content is 45-60%, drains after impregnation, glue rate of body weight gain 20%;
4) the bamboo bundle after impregnation and wood bundle are dried to moisture content 6-14%, the moisture content 10-14% of skin-material, core material 6-10% at 50-80 ℃ of temperature; After dry, bamboo wood is restrainted according to tri-layers of parallel orientation of weight ratio 2:1 or evenly mixes assembly, pressing board length direction orienting spreading;
5) by the slab of the above-mentioned moulding of mating formation at 140-150 ℃, pressure 8.0-10MPa, the time: 1.2-1.8min/mm is hot pressed into plate, the cooling rear ejecting plate of step-down, the plasticizing recombinant material temperature tolerance that hot pressing is produced is good, thermal creep is less.
Embodiment 4:
1) adopt the fresh tangential cizu thin bamboo strip to roll well-thought-out plan bundle, width 5-18mm, length is 50-220cm, the thin rectangular bamboo bundle that thickness is 0.35-2.00mm, goes blue or green de-etiolation; With fresh poplar sawn timber leftover pieces or brush wood, roll out the poplar wood bundle of equal-specification, as the Component units of plasticizing recombinant material;
2) in above-mentioned bamboo and wood Shu culturing room, carry out mould and naturally cultivate, humidity 90 ± 5%, temperature 25-35 ℃, cultivating appears stopping for latter 2 days in surface mould, takes out;
3) the bamboo bundle after going mouldy and wood are restrainted into 0.85% sodium acid carbonate washing, after processing, be dried to moisture content 6-10%; Employing 0.5% reduction is black greatly or alkaline large black solution is restrainted by dried wood or bamboo Shu Jinhang dyes, and dyeing is temperature 60-90 ℃, time 6-12 hour, and rear taking-up of dyeing is dried to moisture content 6-14%; Adopt solid content 33%, pH value 7-8.7, the pf resin of low molecular weight impregnation of host molecule amount 500-850, bamboo Shu Caiyong molecular weight 2000-2500, the phenolic resins impregnation that solid content is 45-60%, drains after impregnation, glue rate of body weight gain 20%;
4) the bamboo bundle after impregnation and wood bundle are dried to moisture content 6-14%, the moisture content 10-14% of skin-material, core material 6-10% at 50-80 ℃ of temperature; After dry, bamboo wood bundle evenly mixes assembly according to weight ratio, pressing board length direction orienting spreading at 1: 1;
5) by the slab of the above-mentioned moulding of mating formation at 140-150 ℃, pressure 8.0-10MPa, time: 1.2-1.8min/mm is hot pressed into plate, the cooling rear ejecting plate of step-down, the alternate cross lamination of the black Huang of plasticizing recombinant material tool that hot pressing is produced, like tiger fur line or leopard line, outward appearance is beautiful.
Claims (7)
1. adopt spontaneous mould to process the method for bamboo wood and fast growing wood manufacture plasticizing recombinant material, it is characterized in that comprising following processing step:
1) fresh bamboo wood and fast growing wood are rolled into bamboo bundle and the wood bundle that thickness is less than 2mm, the moisture control of the bamboo bundle processing and wood bundle is more than 15%;
2) in above-mentioned bamboo and wood Shu culturing room, carry out mould and naturally cultivate, humidity 90 ± 5%, temperature 25-35 ℃, surface mould occurs stopping after 2-3 days or the maximum weight-loss ratio of bamboo wood bundle over dry stops cultivating when 8-15%;
3) by the bamboo bundle after going mouldy and the washing of wooden Shu Jinhang 0.5-1% sodium acid carbonate, be then dried to moisture content 12-14%; Dried wood bundle, adopts solid content 33-70%, pH value 7-8.7, host molecule amount is the pf resin of low molecular weight impregnation of 500-850, bamboo Shu Caiyong molecular weight 1500-2800, impregnation after the phenolic resins of solid content 45-60% dilutes a times, after impregnation, drain glue weightening finish dose rate 18-35%; At 50-80 ℃ of temperature, be dried to moisture content 6-14%, be used as the moisture content 12-16% of the top layer bamboo wood beam material of goods surface layer, for being core material 6-10%;
4) impregnation dry after in a certain proportion of layer of bamboo and wood Shu Jinhang or interlayer mixings assembly, pressing board length direction orientation or mat formation at random and be pressed into plate;
5) by the slab of the above-mentioned moulding of mating formation at 140-150 ℃, pressure 8.0-20MPa, the time, under 1.1-1.8min/mm parameter, hot pressing making sheet or the employing heat cure moulding of colding pressing.
2. according in claim 1 1) described bamboo bundle be through being processed into thin microscler, laterally separate continuous bamboo bundle sheet or narrower single bamboo bundle, width should be the more than 4 times of thickness, and thickness is less than 2mm; The tangential bamboo bundle of making that rolls need go blue or green de-etiolation, radially rolls the bamboo bundle of making, and does not go blue or green de-etiolation.
3. according in claim 1 2) described in, bamboo bundle and the spontaneous mycotic culture of wooden Shu Caiyong, wood bundle selects with material the fast growing wood that is easy to go mouldy; Rotproofness good fast-growing Chinese fir do not need mycotic culture, can be directly mix use with the bamboo bundle going mouldy after processing.
4. according in claim 1 3) described in, go mouldy and process rear bamboo bundle and the cleaning of wooden Shu Caiyong 0.5-1% sodium bicarbonate aqueous solution, according to fungus growth density or surperficial mould variability, adjust, stand density be greater than or mould variability higher than the 50% corresponding raising sodium bicarbonate aqueous solution of need concentration, otherwise reduce sodium bicarbonate aqueous solution concentration or directly washing.
5. according in claim 1 4) described in, the bamboo bundle after cleaning-drying and wood bundle, dyeing or do not dye after impregnation respectively again, to increase the aesthetic property of material; During assembly by weight bamboo bundle: wood bundle=1: 4-4: 1, adopting bamboo bundle is upper and lower top layer, wood bundle is sandwich layer three layers of oriented structure or bamboo bundle and wood bundle directly mixes rear assembly and becomes hybrid structure.
6. according in claim 1 5), hot pressing back segment takes out into plate after being down to 40 ℃; Cold pressing curing, the bamboo bundle after impregnation and wood bundle are dried to 150 ℃, before resin solidification, proceed to immediately cold press, under 8.0-10.0MPa pressure, be pressed into mould pressurize, be fixedly heated to resin solidification, the cooling rear taking-up finished product of pressing mold, finished product needs health more than 7 days.
7. according to the spontaneous mould of the employing of one of claim 1-6, process the bamboo wood plasticizing recombinant material of the method production of bamboo wood and fast growing wood manufacture plasticizing recombinant material, it is characterized in that: bamboo bundle and wood bundle that the thickness of take is less than 2mm are Component units, after spontaneous mould is processed, wood bundle dipping 500-850 pf resin of low molecular weight, the phenolic resin glue of bamboo bundle dipping 1500-2800 higher molecular weight, the dry compacting of mating formation forms.Its paving structure comprises following five types, 1) bamboo bundle is upper and lower surface layer, and wood bundle is three layers of parallel orientation structure of sandwich layer; 2) the upper and lower surface layer of bamboo bundle, sandwich layer is that three layers of bamboo wood bundle mixing orientation are parallel to structure; 3) wood bundle is upper and lower surface layer, three layers of parallel orientation structure that bamboo bundle is sandwich layer; 4) wooden bundle as upper and lower surface layer, sandwich layer is that three layers of bamboo wood bundle mixing orientation are parallel to structure; 5) after bamboo bundle and wood bundle mix, parallel orientation or random paving structure.
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Cited By (10)
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| CN104015238A (en) * | 2014-06-23 | 2014-09-03 | 福建农林大学 | Mildew-proof retreatment method of mildewed bamboo chips |
| CN104070571A (en) * | 2014-06-17 | 2014-10-01 | 福建农林大学 | Method for preventing bamboo from mildewing by using aspergillus flavus |
| CN109304776A (en) * | 2018-08-03 | 2019-02-05 | 南京林业大学 | A kind of friction welding circle bamboo tenon manufacturing process and its manufacturing equipment |
| CN111483033A (en) * | 2020-04-29 | 2020-08-04 | 广东省林业科学研究院 | Method for preparing recombined bamboo by adopting radial bamboo skin and recombined bamboo obtained by method |
| CN112659279A (en) * | 2020-12-04 | 2021-04-16 | 中国林业科学研究院木材工业研究所 | Wood recombinant material and preparation method thereof |
| CN112895048A (en) * | 2021-01-18 | 2021-06-04 | 浙江农林大学 | Method for recycling mildewed dried bean curd stick wood |
| CN114536503A (en) * | 2022-02-28 | 2022-05-27 | 宜丰县永安建材有限责任公司 | Production method of heavy bamboo wide-breadth board |
| CN114714459A (en) * | 2022-04-07 | 2022-07-08 | 湖南桃花江竹材科技股份有限公司 | Outdoor high-weather-resistance bamboo reconstituted material and manufacturing method thereof |
| CN115091565A (en) * | 2022-07-15 | 2022-09-23 | 浙江农林大学 | Method for preparing large shaving board by using moldy waste raw bamboo |
| CN115401758A (en) * | 2022-09-26 | 2022-11-29 | 江西米来竹业有限公司 | Impregnation liquid for outdoor heavy bamboo products and processing technology thereof |
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| CN104070571B (en) * | 2014-06-17 | 2016-04-06 | 福建农林大学 | A kind ofly utilize Aspergillus flavus to the method preventing bamboo wood from going mouldy |
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| CN104015238A (en) * | 2014-06-23 | 2014-09-03 | 福建农林大学 | Mildew-proof retreatment method of mildewed bamboo chips |
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| CN112659279A (en) * | 2020-12-04 | 2021-04-16 | 中国林业科学研究院木材工业研究所 | Wood recombinant material and preparation method thereof |
| CN112895048A (en) * | 2021-01-18 | 2021-06-04 | 浙江农林大学 | Method for recycling mildewed dried bean curd stick wood |
| CN114536503A (en) * | 2022-02-28 | 2022-05-27 | 宜丰县永安建材有限责任公司 | Production method of heavy bamboo wide-breadth board |
| CN114536503B (en) * | 2022-02-28 | 2023-01-10 | 宜丰县永安建材有限责任公司 | Production method of heavy bamboo wide-breadth board |
| WO2023193740A1 (en) * | 2022-04-07 | 2023-10-12 | 湖南桃花江竹材科技股份有限公司 | Outdoor high-weather-resistance bamboo scrimber, and manufacturing method therefor |
| CN114714459A (en) * | 2022-04-07 | 2022-07-08 | 湖南桃花江竹材科技股份有限公司 | Outdoor high-weather-resistance bamboo reconstituted material and manufacturing method thereof |
| CN115091565A (en) * | 2022-07-15 | 2022-09-23 | 浙江农林大学 | Method for preparing large shaving board by using moldy waste raw bamboo |
| CN115091565B (en) * | 2022-07-15 | 2023-09-01 | 浙江农林大学 | Method for preparing large-piece shaving board by using mildewed and abandoned bamboo |
| CN115401758A (en) * | 2022-09-26 | 2022-11-29 | 江西米来竹业有限公司 | Impregnation liquid for outdoor heavy bamboo products and processing technology thereof |
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