CN116494344A - ENF-grade bamboo-wood composite mixed artificial board and continuous flat pressing method thereof - Google Patents
ENF-grade bamboo-wood composite mixed artificial board and continuous flat pressing method thereof Download PDFInfo
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- CN116494344A CN116494344A CN202310313019.0A CN202310313019A CN116494344A CN 116494344 A CN116494344 A CN 116494344A CN 202310313019 A CN202310313019 A CN 202310313019A CN 116494344 A CN116494344 A CN 116494344A
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- 239000002023 wood Substances 0.000 title claims abstract description 64
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000003825 pressing Methods 0.000 title claims abstract description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 claims abstract description 53
- 241001330002 Bambuseae Species 0.000 claims abstract description 52
- 239000011425 bamboo Substances 0.000 claims abstract description 52
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 51
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 51
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 51
- 239000010410 layer Substances 0.000 claims abstract description 35
- 239000012792 core layer Substances 0.000 claims abstract description 32
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 22
- 239000003292 glue Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 230000002452 interceptive effect Effects 0.000 claims abstract description 8
- 239000012948 isocyanate Substances 0.000 claims abstract description 8
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 7
- 238000009417 prefabrication Methods 0.000 claims abstract description 7
- 230000006798 recombination Effects 0.000 claims abstract description 7
- 238000005215 recombination Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims abstract 2
- 238000004026 adhesive bonding Methods 0.000 claims description 30
- 238000007731 hot pressing Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 14
- 239000002028 Biomass Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 9
- 239000004202 carbamide Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229920000877 Melamine resin Polymers 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 235000011609 Pinus massoniana Nutrition 0.000 claims description 4
- 241000018650 Pinus massoniana Species 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 235000013312 flour Nutrition 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 241000218631 Coniferophyta Species 0.000 claims description 3
- 244000166124 Eucalyptus globulus Species 0.000 claims description 3
- 241000218652 Larix Species 0.000 claims description 3
- 235000005590 Larix decidua Nutrition 0.000 claims description 3
- 235000011611 Pinus yunnanensis Nutrition 0.000 claims description 3
- 241000018652 Pinus yunnanensis Species 0.000 claims description 3
- 241000219000 Populus Species 0.000 claims description 3
- 229930006000 Sucrose Natural products 0.000 claims description 3
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 238000007037 hydroformylation reaction Methods 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000005720 sucrose Substances 0.000 claims description 3
- 229920001864 tannin Polymers 0.000 claims description 3
- 239000001648 tannin Substances 0.000 claims description 3
- 235000018553 tannin Nutrition 0.000 claims description 3
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 claims description 2
- 241000218657 Picea Species 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 2
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 2
- 230000008521 reorganization Effects 0.000 claims 1
- 241000238631 Hexapoda Species 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 239000011120 plywood Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000005034 decoration Methods 0.000 abstract 1
- 241000218602 Pinus <genus> Species 0.000 description 5
- 235000005205 Pinus Nutrition 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000256602 Isoptera Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention provides a continuous flat pressing method for an ENF-level bamboo-wood composite mixed artificial board, and relates to the technical field of artificial board manufacturing. The continuous automatic production line is characterized by comprising the working procedures of core layer prefabrication, interactive recombination, continuous hot-press forming and the like, wherein the working procedures are sequentially connected through a conveying device to form an ENF-level bamboo-wood composite mixed artificial board continuous automatic production line, the core layer prefabrication is prepared by taking bamboo shavings and isocyanate adhesives as raw materials and using a continuous flat-press production technology, the interactive recombination is formed by taking a prefabricated core layer as a base material and biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin as an adhesive, the upper layer rotary cut veneers and the lower layer rotary cut veneers are crisscross formed according to a symmetry principle, at least 2 layers of rotary cut veneers in the upper layer and the lower layer rotary cut veneers are subjected to hot-press forming, and the continuous flat-press production technology and a high-temperature low-pressure technology are used. The invention solves the technical problem that bamboo is difficult to glue by reasonably selecting the adhesive, and can ensure that the product meets the ENF-level formaldehyde release limit requirement, the prepared ENF-level bamboo-wood composite hybrid artificial board avoids the defect that the bamboo is easy to mildew and insect, the product can be used in the field of construction, and can also replace plywood for household manufacturing and indoor decoration.
Description
Technical Field
The invention relates to a continuous flat pressing manufacturing method of an ENF-level bamboo-wood composite mixed artificial board, and belongs to the technical field of artificial board production.
Background
Compared with wood, the bamboo has the advantages of one-time forestation, quick growth, long fiber, high strength and the like, and is feasible to implement 'replace wood with bamboo' in part of fields.
In China, the report of industrial production of bamboo wood-based panels such as oriented strand boards and the like is made, and at present, the main defects of the bamboo wood-based panels include: 1) Mildewing and insect growth. The bamboo wood contains rich nutrition components, and the bamboo artificial board can be mildewed under certain temperature, humidity and other conditions, the phenomenon is caused by mold breeding, and meanwhile, certain components of the bamboo species are nourishments of insects such as moths, termites and the like, so that the bamboo wood is easily damaged due to insect damage. Although the problem of mildew and moth of the artificial bamboo board is relieved by heat treatment or addition of chemical additives and the like, the problem is not thoroughly solved. 2) In the manufacturing process of the bamboo wood-based panels such as the oriented strand boards, the bamboo is cut into smaller structural units, the static bending strength of the bamboo wood-based panels such as the oriented strand boards is close to that of the normal wood oriented strand boards, the large-piece strand boards and the like, and the advantages of the bamboo are not obvious. Due to these drawbacks, the production and use of bamboo wood-based panels is limited.
The patent publication No. CN101214669A provides a bamboo oriented strand board as a container and a carriage bottom plate of a sandwich layer and a manufacturing method thereof, wherein the method uses a hot press with a multi-layer or pressure function reaching more than 400 tons for hot pressing for more than 10-30 minutes, is an intermittent process flow, cannot realize continuous automatic production, has low production efficiency, and the sandwich layer is formed in an oriented manner, so that the production process is complex, the production cost is high, meanwhile, the thickness of the sandwich layer is 12-30 mm, compaction is difficult in the production process, and in addition, clone wood or other hardwood veneers are selected for the method, so that market acquisition is difficult.
Patent application number CN201010597353.6 provides a wood-bamboo composite shaving board and a process, which adopt bamboo splits and wood veneers for compounding, and continuous large-scale industrial production cannot be realized because the manufacturing process of the bamboo splits is complex.
New national standard of artificial board and its product formaldehyde emission grading (GB/T39600-2021) and artificial board indoor bearing based on limiting formaldehyde emissionThe standard quantity-carrying guidelines (GB/T39598-2021) are formally implemented on the 10 th month 1 of 2021, and the formaldehyde release quantity of the indoor board is divided into three grades of E1, E0 and ENF (no aldehyde addition) according to the standard quantity: e1 (. Ltoreq.0.124 mg/m) 3 )、E0(≤0.050mg/m 3 ) And ENF (less than or equal to 0.025 mg/m) 3 ) However, the mature technology for producing ENF-grade bamboo-wood composite mixed artificial boards is not yet available at present, and particularly the technical problem of producing ENF-grade artificial boards by using formaldehyde series resin is to be overcome.
Therefore, the above problems need to be solved.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the present invention provides a continuous flat pressing method for an ENF-grade bamboo-wood composite hybrid artificial board, which at least partially overcomes the defects of the existing bamboo wood artificial board manufacturing method, and ensures that the formaldehyde release amount of the manufactured artificial board reaches the ENF grade through reasonable adhesive selection and the design of hot pressing technology, and is also conducive to the improvement of the performance of the manufactured artificial board.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
prefabricating a core layer. Cutting or rotary-cutting raw bamboo into large pieces, drying, mixing with glue, paving into plate blank, preheating, and continuously hot-pressing to obtain prefabricated core layer.
Preferably, the thickness of the bamboo shavings is 0.5-1.1 mm, the length is 60-110 mm, the width is 20-50 mm,
preferably, the water content of the dried bamboo shavings is 10-20%,
preferably, a drum-type glue mixer is used for mixing glue, the used adhesive is isocyanate adhesive, the glue application amount is 3-8% of the weight of the large bamboo chips,
preferably, a conventional mechanical mat is used for random mat formation, forming a continuous uniform mat,
preferably, the core temperature of the slab is increased to 90 c in 30 seconds by steam preheating,
preferably, a continuous hot press is used for hot pressing, the hot pressing time is 5-15 s/mm,
preferably, the thickness of the preformed core layer is 5-11 mm.
And (5) interactive recombination. The wood section is made into a wood veneer by rotary cutting, the wood veneer is dried and is coated with glue on two sides, the glued veneer, a glue coated prefabricated core layer and a long veneer are assembled according to the principle that the symmetry and the fiber grain direction of the adjacent layers are mutually perpendicular, and the bamboo-wood composite mixed artificial board slab is obtained.
Preferably, the thickness of the wood veneer is 0.7-2.5 mm, the wood veneer is selected from the conifer species veneers such as poplar, eucalyptus, etc., and the pinus species veneers such as pinus massoniana, pinus yunnanensis, pinus larch, pinus pinnatifida, etc.,
preferably, the water content of the dried veneer is 8-12%,
preferably, the dried wood veneer or the prefabricated core layer is glued on both sides by a roll-type glue coater, and the adhesive component used is biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin: flour: curing agent = 100: 15-30: 1 to 3, wherein the double-sided gluing amount is 280 to 320g/m 2 ，
Preferably, firstly paving a lower surface long single board, paving a lower surface gluing single board, then paving a prefabricated core layer after cooling and sanding treatment, and then paving an upper surface gluing single board and an upper surface long single board, wherein the fiber texture direction of the long single board is parallel to the direction of a production line, and the fiber texture direction of the gluing single board is perpendicular to the direction of the production line;
preferably, the lower surface long single board is paved firstly, the lower surface gluing single board and the inner layer long single board are paved, then the gluing is paved to obtain a prefabricated core layer, and then the inner layer long single board, the upper surface gluing single board and the upper surface long single board are paved, wherein the fiber texture direction of the long single board is parallel to the direction of a production line, and the fiber texture direction of the gluing single board is perpendicular to the direction of the production line.
And (5) continuously hot-press molding. A continuous hot press is used, and a sectional type high-temperature low-pressure process is adopted.
Preferably, the hot pressing temperature is 160-210 ℃, the pressure in the first stage is 1.5-2.0MPa, the pressure in the second stage is 0.1-0.2MPa, and the pressure in the third stage is 1.0-1.5MPa.
The working procedures of core layer prefabrication, interactive recombination, hot press forming and the like are sequentially connected through a conveying device to form the ENF-level bamboo-wood composite hybrid artificial board continuous automatic production line.
According to the manufacturing method of the ENF-level bamboo-wood composite mixed artificial board, the prefabricated core layer of the bamboo large-piece shaving board is made of isocyanate adhesives, the interaction layer of the bamboo large-piece shaving board and the wood veneer layer are made of biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin serving as adhesives, and a roller coating mode with higher adaptability is selected.
Preferably, the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin, wherein biomass:
melamine: urea: the formaldehyde mass ratio is 10: 3-10: 60:30,
the preparation method of the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin comprises the following steps:
1) Under the stirring state, adding the biomass component, 45 percent urea and formaldehyde into a reaction kettle, slowly heating,
2) Adjusting the pH to 5.5-6.5, heating to 75 ℃, adding melamine, preserving heat and reacting for 30 minutes,
3) Adjusting the pH value to 4.5-5.5, heating to 90-95 ℃, preserving heat and reacting for 90 minutes,
4) Quickly regulating pH to 7.0-7.5, quickly cooling to 65-70 deg.C, adding 55% urea, thermal-insulating reaction for 30 min,
5) Rapidly cooling to 25-35 ℃ for standby;
wherein the biomass component comprises hydroformylation-treated cellulose, industrial lignin, tannins, and sucrose.
The biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin has the following performance indexes:
solids content%: 55 to 65 percent of the total weight of the composite,
viscosity mpa.s:80 to 300 percent of the total weight of the composite,
pH value: 7.1 to 7.6 percent of the total weight of the composite,
free formaldehyde content%: is less than 0.01 of the total weight of the composite material,
storage period: for more than 15 days;
preferably, the curing agent is obtained by uniformly mixing the following components in parts by weight:
water: 100g of the total weight of the powder,
ammonium sulfate or ammonium chloride: 35g of the total weight of the powder,
n-methylolacrylamide: 0.5g to 1.5g of the total weight of the composition,
ammonium persulfate: 0.1-0.5 g;
(III) beneficial effects
The beneficial effects of the invention are as follows:
1. the aim of producing the ENF grade artificial board is fulfilled. The produced bamboo-wood composite artificial board meets the limit standard of ENF-level formaldehyde release through two paths. Firstly, the adhesive is reasonably selected, the isocyanate adhesive is selected as the prefabricated core layer of the bamboo large-piece shaving board, the problem that bamboo is difficult to glue is solved, the total formaldehyde release amount of the artificial board can be reduced, the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin is used as the adhesive for the interaction layer of the bamboo large-piece shaving board and the wood veneer layer, the production cost can be reduced, the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin is connected with the existing production technology, and secondly, the biomass modified formaldehyde resin is prepared, and the free formaldehyde content in the resin is further reduced by adding active biomass components.
2. The production efficiency of the bamboo-wood composite mixed artificial board is improved. After the prefabricated core layer is prepared by the continuous flat pressing technology, the prefabricated core layer is assembled again and subjected to the second continuous flat pressing hot pressing, so that the process stagnation in the intermittent production technology is eliminated, meanwhile, the production efficiency is improved by the multi-strategy combination of the steam preheating technology and the like, and the hot pressing period can be shortened to 5-15 s/mm from more than 60 s/mm.
3. Simplifying the production technology. The invention selects the conifer species single boards of poplar, eucalyptus, etc. and the pinus species single boards of pinus massoniana, yunnan pine, larch, pinus pinnatifida, spruce, etc. and the raw materials are easy to obtain, and meanwhile, the production technology does not change the equipment and the technological process of the shaving board production line, and the production of the bamboo-wood composite mixed artificial board can be realized only by adding related equipment in the existing production line.
4. Overcomes the defect that bamboo is easy to generate mildew and insect. The outer layer of the mixed artificial board is a wooden veneer through bamboo-wood combination, so that the bamboo is effectively isolated from the outside, the influence of temperature and humidity in the air on the bamboo is isolated, and no mildew preventive is required to be added or mildew-proof technology is used for treatment.
5. The artificial board has excellent performance. Through the combination with the wood veneer and the design of the hot pressing process parameters, the static bending strength of the artificial board is effectively improved, the assembly process follows the principle of cross symmetry, the performance of the bamboo-wood composite artificial board is ensured to be more similar to that of a plywood, the number of layers of the wood veneer can be adjusted according to the requirement, and the performance of the artificial board is improved.
Drawings
FIG. 1 is a schematic flow chart of a continuous flat pressing method for manufacturing an ENF-grade bamboo-wood composite mixed artificial board
FIG. 2 is a schematic diagram of an ENF-grade bamboo-wood composite hybrid artificial board structure prepared by the invention
In the figure, 1-1, a long veneer is arranged on the lower surface; 1-2, a long veneer is arranged on the upper surface; 2-1, gluing a veneer on the lower surface; 2-2, gluing a veneer on the upper surface; 3-1, a long veneer on the lower inner surface; 3-2, a long veneer on the upper inner surface; 4, prefabricating the core layer.
Detailed Description
Example ENF-grade bamboo-wood composite hybrid artificial boards with different thicknesses and manufacturing methods thereof (wherein A is 18mm, B is 16mm, C is 15mm, D is 13 mm)
First, prefabrication of core layer
1. Preparation of bamboo shavings
The specification of the bamboo big chip shavings is as follows:
a: the thickness is 0.5mm, the length is 60mm, the width is 20mm, and the water content of the wood shavings is 20%.
B: the thickness is 0.7mm, the length is 90mm, the width is 40mm, and the water content of the wood shavings is 10%.
C: the thickness is 1.1mm, the length is 110mm, the width is 50mm, and the water content of the wood shavings is 6%.
D: the thickness is 0.9mm, the length is 70mm, the width is 30mm, and the water content of the wood shavings is 15%.
2. Glue for mixing bamboo big chip shavings
The bamboo shavings are evenly mixed with the spray isocyanate adhesive by a roller-type glue mixer.
3. Paving of bamboo large wood shaving plate blank
Paving by using a mechanical paving head to obtain a continuous and uniform plate blank,
4. preheating
The plate blank is preheated by steam before entering the hot press,
5. hot pressing
The slab enters a continuous hot press for hot pressing to obtain a prefabricated core layer 4 with target thickness, wherein:
A：11mm
B：10mm
C：5mm
D：6mm
(II) Interactive recombination
1. Preparation of biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin:
biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin, wherein biomass: melamine: urea:
the formaldehyde mass ratio is 10: 3-10: 60:30, the preparation method is as follows:
1) Adding biomass components, 45% urea and formaldehyde into a reaction kettle under stirring, slowly heating,
2) Adjusting the pH to 5.5-6.5, heating to 75 ℃, adding melamine, preserving heat and reacting for 30 minutes,
3) Adjusting the pH value to 4.5-5.5, heating to 90-95 ℃, preserving heat and reacting for 90 minutes,
4) Quickly regulating pH to 7.0-7.5, quickly cooling to 65-70 deg.C, adding 55% urea, thermal-insulating reaction for 30 min,
5) Rapidly cooling to 25-35 ℃ for standby;
wherein the biomass component comprises hydroformylation-treated cellulose, industrial lignin, tannins, and sucrose.
The biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin has the following performance indexes:
solids content%: 55 to 65 percent of the total weight of the composite,
viscosity mpa.s:80 to 300 percent of the total weight of the composite,
pH value: 7.1 to 7.6 percent of the total weight of the composite,
free formaldehyde content%: 0.01 to 0.08 percent of the total weight of the composite material,
storage period: for more than 15 days;
2. veneer preparation and drying
The wood section is subjected to rotary cutting to prepare a wood veneer, and the veneer has the specification of:
a: the thickness of the glued single plate is 1.6mm, the thickness of the long single plate is 1.9mm, and the water content after drying is 8%.
B: the thickness of the glued single plate is 1.6mm, the thickness of the long single plate is 0.7mm, and the water content after drying is 12%.
C: the thickness of the glued single plate and the long single plate is 2.5mm, and the water content of the dried single plate is 10%.
D: the thickness of the glued single plate is 1.5mm, the thickness of the long single plate is 2.0mm, and the water content after drying is 12%.
3. Gluing
According to biomass-melamine-urea-formaldehyde multicomponent copolycondensation resins: flour: curing agent = 100: 15-30: 1 to 3, mixing to obtain the adhesive for gluing,
coating the coated single plate with a roll coater, wherein the double-sided coating amount is 280-320 g/m 2 。
4. Assembly
A. C, D group blank: firstly, paving a lower surface long single plate 1-1, paving a lower surface gluing single plate 2-1, paving a prefabricated core layer 4 after cooling and sanding treatment, and paving an upper surface gluing single plate 2-2 and an upper surface long single plate 1-2 successively, wherein the fiber texture direction of the long single plate is parallel to the direction of a production line, and the fiber texture direction of the gluing single plate is perpendicular to the direction of the production line;
and B, assembling: firstly, paving a lower surface long single plate 1-1, paving a lower surface gluing single plate 2-1, paving a lower inner surface long single plate 3-1, paving a glued prefabricated core layer 4, and sequentially paving an upper inner surface long single plate 3-2, an upper surface gluing single plate 2-2 and an upper surface long single plate 1-2, wherein the fiber texture direction of the long single plate is parallel to the direction of a production line, and the fiber texture direction of the gluing single plate is perpendicular to the direction of the production line;
(III) continuous hot press molding
And a continuous hot press is used, a sectional high-temperature low-pressure process is adopted, wherein the hot pressing temperature is 160-210 ℃, the pressure in the first stage is 1.5-2.0MPa, the pressure in the second stage is 0.1-0.2MPa, and the pressure in the third stage is 1.0-1.5MPa.
The formaldehyde emission detection results of the obtained bamboo-wood composite mixed artificial board are shown in Table 1
TABLE 1
The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (10)
1. The continuous flat pressing manufacturing method of the ENF-level bamboo-wood composite mixed artificial board is characterized by sequentially comprising core layer prefabrication, interactive recombination and continuous hot-press forming processes, wherein the processes are sequentially connected through a conveying device to form an ENF-level bamboo-wood composite mixed artificial board continuous automatic production line, the core layer prefabrication is prepared by using bamboo large wood shavings and isocyanate adhesives as raw materials and using a continuous flat pressing production technology, the interactive recombination is performed by using a prefabricated core layer as a base material and biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin as an adhesive, the upper layer rotary-cut veneers and the lower layer rotary-cut veneers are crisscross according to a symmetry principle, the veneers in the upper layer and the lower layer are at least 2 layers, and the hot-press forming uses a continuous flat pressing production technology and a segmented high-temperature low-pressure technology.
2. The method of manufacturing of claim 1, wherein the core prefabrication comprises the steps of:
(1) Preparing large bamboo shavings, namely cutting or rotary-cutting raw bamboo into large bamboo shavings, wherein the thickness of the large bamboo shavings is 0.5-1.1 mm, the length is 60-110 mm, and the width is 20-50 mm;
(2) Drying the bamboo shavings, wherein the water content of the dried shavings is 10-20%;
(3) Glue mixing, namely mixing the dried bamboo shavings with an isocyanate adhesive uniformly by a roller-type glue mixer, wherein the glue application amount is 3-8% of the weight of the bamboo shavings;
(4) Paving, namely forming a continuous and uniform plate blank by using conventional mechanical paving and random paving;
(5) Steam preheating to raise the core layer temperature of the slab to 90 ℃ within 30 seconds;
(6) Hot pressing, namely, the plate blank enters a continuous hot press for hot pressing, wherein the hot pressing time is 5-15 s/mm;
the prefabricated core layer is obtained, and the thickness of the prefabricated core layer is 5-11 mm.
3. The method of manufacturing of claim 1, wherein the interactive reorganization comprises the steps of:
(1) Preparing a veneer, namely preparing a wood veneer by rotary cutting a wood section, wherein the thickness of the wood veneer is 0.7-2.5 mm, and selecting conifer species veneers such as poplar, eucalyptus, pinus massoniana, yunnan pine, larch, pinus massoniana, spruce and the like;
(2) Drying the single board, wherein the water content of the dried single board is 8-12%;
(3) Gluing the veneer, gluing the dried wood veneer on the double sides of a roller type gluing machine, wherein the adhesive component is biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin: flour: curing agent = 100: 15-30: 1 to 3, wherein the double-sided gluing amount is 280 to 320g/m 2 ；
(4) Coating the prefabricated core layer, wherein the prefabricated core layer is coated on both sides by a roller type coating machine, and the adhesive component is biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin: flour: curing agent = 100: 15-30: 0.5 to 3, wherein the double-sided gluing amount is 280 to 320g/m 2 ；
(5) Firstly, paving a lower surface long single plate, paving a lower surface gluing single plate, paving a cooled and sanded prefabricated core layer, and paving an upper surface gluing single plate and an upper surface long single plate successively, wherein the fiber texture direction of the long single plate is parallel to the direction of a production line, and the fiber texture direction of the gluing single plate is perpendicular to the direction of the production line; or assembling II, firstly paving the lower surface long single plate, paving the lower surface gluing single plate and the inner layer long single plate, then paving the gluing to obtain a prefabricated core layer, and then paving the inner layer long single plate, the upper surface gluing single plate and the upper surface long single plate, wherein the fiber texture direction of the long single plate is parallel to the direction of the production line, and the fiber texture direction of the gluing single plate is perpendicular to the direction of the production line;
and obtaining the bamboo-wood composite mixed artificial board blank.
4. The method of manufacturing as claimed in claim 1, wherein,
the continuous hot press forming is carried out by adopting a continuous hot press and adopting a sectional type high-temperature low-pressure process, wherein the hot press temperature is 160-210 ℃, the pressure in the first stage is 1.5-2.0MPa, the pressure in the second stage is 0.1-0.2MPa, and the pressure in the third stage is 1.0-1.5MPa; and obtaining the bamboo-wood composite hybrid artificial board.
5. The method of manufacturing according to claim 3, wherein,
the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin, wherein biomass: melamine: urea: the formaldehyde mass ratio is 10: 3-10: 60:30,
the preparation method of the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin comprises the following steps:
(1) Under the stirring state, adding the biomass component, 45% urea and formaldehyde into a reaction kettle, and slowly heating;
(2) Adjusting the pH to 5.5-6.5, heating to 75 ℃, adding melamine, and then preserving heat for reaction for 30 minutes;
(3) Adjusting the pH value to 4.5-5.5, heating to 90-95 ℃, and reacting for 90 minutes with heat preservation;
(4) Quickly regulating the pH value to 7.0-7.5, quickly cooling to 65-70 ℃, adding 55% urea, and carrying out heat preservation reaction for 30 minutes;
(5) Rapidly cooling to 25-35 ℃ for standby;
wherein the biomass component comprises hydroformylation-treated cellulose, industrial lignin, tannins, and sucrose;
the biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin has the following performance indexes:
solids content%: 55 to 65 percent of the total weight of the composite,
viscosity mPa.s:80 to 300 percent of the total weight of the composite,
pH value: 7.1 to 7.6 percent of the total weight of the composite,
free formaldehyde content%: 0.01 to 0.08 percent of the total weight of the composite material,
storage period: over 15 days.
6. The method of manufacturing according to claim 3, wherein,
the curing agent is obtained by uniformly mixing the following components in parts by weight:
water: 100g of the total weight of the powder,
ammonium sulfate or ammonium chloride: 35g of the total weight of the powder,
n-methylolacrylamide: 0.5g to 1.5g of the total weight of the composition,
ammonium persulfate: 0.1-0.5 g.
7. The ENF grade bamboo-wood composite artificial board according to any one of claims 1 to 6, comprising a prefabricated core layer and an upper layer and a lower layer, wherein the prefabricated core layer is formed by randomly paving large bamboo shavings, the upper layer and the lower layer are formed by crisscross and orderly crossing whole wood veneers according to a symmetry principle, the number of veneer layers of the upper layer and the lower layer is at least 2, and the grain directions of the large bamboo shavings layer and the veneer layer which are contacted with each other are mutually perpendicular.
8. The hybrid artificial board according to claim 7, wherein the thickness of the bamboo shavings is 0.5-1.1 mm and the length is 60-110 mm,
the width is 20-50 mm, and the water content of the wood shavings is 6-15%.
9. The hybrid artificial board according to claim 7, wherein the wood veneer has a thickness of 0.7 to 2.5mm and a width of 1225 to 1500mm.
10. The hybrid artificial board according to claim 7, wherein the adhesive used for mixing the bamboo shavings with the adhesive is adhesiveThe adhesive is commercial isocyanate adhesive, the glue application amount is 3-8% of the weight of the bamboo shavings, the adhesive used in the interaction layer of the bamboo shavings and the wood veneer is biomass-melamine-urea-formaldehyde multicomponent copolycondensation resin, and the double-sided glue application amount is 280-320 g/m 2 。
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