CN110948630A - Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board - Google Patents
Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board Download PDFInfo
- Publication number
- CN110948630A CN110948630A CN201911331584.XA CN201911331584A CN110948630A CN 110948630 A CN110948630 A CN 110948630A CN 201911331584 A CN201911331584 A CN 201911331584A CN 110948630 A CN110948630 A CN 110948630A
- Authority
- CN
- China
- Prior art keywords
- surface layer
- oriented strand
- strand board
- wood shavings
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention provides an oriented strand board with an ultrathin large-piece wood shaving surface layer and a preparation process thereof, wherein the method comprises the steps of preparation of a core layer and a sub-surface layer of wood shaving, preparation of surface layer wood shaving, drying of raw materials, gluing, paving, hot pressing and post-treatment; the obtained oriented strand board with the surface layer being ultrathin large-piece wood shavings has the advantages that the mechanical property of the whole board is greatly improved: low density, smooth surface, roughness of 0.02-0.30 μm; the internal bonding strength is 2.0-2.5 MPa; the adopted raw materials are three residues such as branch materials, sheet skins, rotary-cut leftovers and the like, so that the comprehensive utilization of resources is promoted, the value is increased efficiently, and the production cost is reduced by more than 30%; the density of the plate is reduced by 10 percent, and raw materials are saved; the size stability is good, the water absorption thickness expansion rate is reduced by 20% compared with a fiberboard, the processing performance is good, and the surface can be directly processed by impregnated paper, PVC, veneer and the like; the product has wide application, and can be used for decoration of wood structure buildings, furniture, floors, container bottom plates and the like.
Description
Technical Field
The invention belongs to the technical field of artificial boards, relates to an oriented shaving board with an ultrathin large-piece wood shaving surface layer, and particularly relates to an oriented shaving board with an ultrathin large-piece wood shaving surface layer and a preparation process thereof.
Background
Oriented strand board is one of the new shaving board varieties. When the wood shavings are paved and formed, the glue-mixed wood shavings are longitudinally arranged according to the fiber direction of the wood shavings on the upper surface layer and the lower surface layer of the oriented strand board, the wood shavings on the core layer are transversely arranged to form a three-layer structure plate blank, and then the oriented strand board is manufactured through hot pressing. The shaving board has the advantages that the length and the width of the shaving shape are required to be larger, and the thickness of the shaving shape is slightly thicker than that of the shaving shape of the common shaving board. The oriented strand board is an artificial engineering structural board which is made up by peeling small-diameter log, cutting into pieces (usually 40-140mm in length, 5-20 mm in width and 0.40-0.60 mm in thickness) with certain geometric shape along the wood grain direction, drying, applying synthetic resin adhesive and water-proofing agent, simulating the fibre arrangement direction of natural wood, laying them in an oriented mode to form a board blank, and hot-pressing at high temperature. The upper and lower layers of the core layer are symmetrical to the middle surface of the core layer, the surface wood shavings are longitudinally arranged, and the core layer wood shavings are transversely arranged; oriented paving of the oriented strand board enables the oriented strand board to have the characteristic of higher strength in a certain direction, and the oriented strand board is often used as a structural material instead of plywood.
The existing oriented strand board has the characteristics of high strength, good dimensional stability, good processability and the like, the design concept of the oriented strand board is to combine the advantages of plywood and a common strand board into one, the characteristics of longer wood units, distinct layers and uniform arrangement of the plywood are fused, the characteristics of simple and convenient operation and large-scale production in the processing process of the common strand board are taken, and finally, the board which has high strength, strong shearing resistance, large static bending strength and excellent performance and can be industrially produced on a large scale is produced. The oriented shaving board is produced with small-diameter material, and has wood shavings of length 40-140mm, width 5-20 mm and thickness 0.20-0.60 mm, and the surface layer wood shavings in the same shape and size are laid in certain orientation mode, the core layer wood shavings are arranged transversely, the surface layer wood shavings are arranged longitudinally, and the surface layer wood shavings form certain oriented angle. However, such oriented strand board has two limitations, firstly, in the aspect of raw material preparation, the oriented strand board has a large requirement on the size of the strands, so the required log diameter level cannot be too small, generally more than 150mm, and the strands are prepared after peeling. Therefore, the raw material purchase has certain limitation, the price is higher than that of the common small-diameter material, the raw material purchase cost is increased, and the plate cost is higher. Secondly, because the surperficial wood shavings size is great, and is little different with the sandwich layer wood shavings, the panel unevenness of the panel of making, if be used for interior decoration or make furniture, need carry out the secondary operation after surface treatment, just can carry out the veneer decoration, like sand light, two-sided veneer of pasting certain thickness etc. can improve the processing cost in later stage like this, has also increased manufacturing procedure, has restricted its scope of use to a certain extent. The above two points limit the application range of the artificial board under the condition of intense market competition of the artificial board at present, and reduce the market competitiveness. With the increasingly fierce market competition of artificial boards, the above disadvantages of the common oriented strand boards need to be solved urgently.
The existing oriented strand board does not have an oriented strand board with an ultrathin large-piece wood chip on the surface layer because the following technical problems cannot be solved: (1) the mechanical properties of the existing oriented strand board cannot be improved simultaneously: the elastic modulus and the internal bonding strength are low; (2) the increase in strength is premised on an increase in density; (3) the surface is uneven and easy to bubble and burst.
Disclosure of Invention
Aiming at the defects, the invention aims to provide an oriented shaving board with an ultrathin large-piece shaving surface layer and a preparation process thereof. The invention can realize the following purposes:
(1) the oriented strand board with the ultrathin large-piece wood shavings on the surface layer improves the overall mechanical property of the board, and simultaneously improves the elastic modulus and the internal bonding strength;
(2) the oriented shaving board with the ultrathin large-piece wood shavings on the surface layer has low density and high internal bonding strength;
(3) the surface layer of the oriented shaving board is an ultrathin large-piece shaving oriented shaving board, and the surface is smooth and not rough; no bubbling and low bursting rate.
In order to solve the problems, the invention adopts the following technical scheme:
the invention provides a method for preparing large wood shavings by using rotary-cut veneer leftovers, twigs, veneers and the like as raw materials for a central layer and a sub-surface layer, and preparing ultrathin large wood shavings by using small-diameter-grade specifications as raw materials for the surface layer.
The invention relates to a preparation process of an oriented strand board with an ultrathin large-piece wood shavings surface layer, which comprises the following steps: preparing core layer and subsurface layer wood shavings, preparing surface layer wood shavings, drying raw materials, gluing, paving, hot pressing and post-treating.
The following are more preferred embodiments/technical solutions of the present invention:
the hot pressing adopts five sections of different hot pressing temperatures and pressures, the length of the press is 64.4m, and the hot pressing factor is 4-8 mm/s.
The hot pressing is carried out, the five-stage hot pressing pressure is respectively 2.6-3MPa, 1.8-2.5MPa, 1.0-1.7MPa, 0.5-0.9MPa and 0.1-0.4MPa, the hot pressing temperature is respectively 230-.
The sizing comprises 2.6 percent of surface MDI glue and 2.5 percent of core layer and subsurface layer.
The preparation of core layer and subsurface layer wood shavings, core layer and subsurface layer wood shavings size is: 60-120mm, 5-40 mm wide and 0.5-1.0mm thick.
The preparation of the surface layer wood shavings comprises the following steps: 120mm, 160mm in width, 20-50mm in width and 0.1-0.5mm in thickness.
The glue is a composite modified resin adhesive, and the composite modified resin adhesive comprises MDI glue, melamine, a natural elm bark extract, a waterproof agent 1.8%, calcium chloride and a curing agent.
The composite modified resin adhesive comprises the following components in parts by weight: 40-50 parts of MDI glue, 20-30 parts of melamine, 5-20 parts of natural elm bark extract, 1.8-10 parts of waterproof agent, 2-5 parts of calcium chloride and 6-25 parts of curing agent.
The MDI glue has CAS number of 9017-23-8, effective component content of more than or equal to 99 percent and density of 1.22-1.24g/cm3。
The preparation process of the oriented shaving board with the surface layer made of ultrathin large-piece wood shavings comprises the steps of preparing wood shavings by using rotary cutting leftovers, branch materials, board skins and the like through sawing, circular planing again and directional paving, wherein the core layer is paved transversely, and the surface layer is paved longitudinally; and preparing ultrathin large-piece wood shavings on the surface layer by using small-diameter-grade dimension materials and using long-material shavings, and paving in a longitudinal directional paving manner. The product has a five-layer structure.
The obtained oriented strand board with the surface layer of ultrathin large-piece wood chips has the parallel bending elastic modulus of 7514-9980MPa and the internal bonding strength of 2.0-2.5 MPa.
The obtained oriented strand board with the surface layer of ultrathin large-piece wood chips has the internal bonding strength of 2.0-2.5MPa and the density of 548-3The density deviation was. + -. 0.01%.
The preparation process of the oriented strand board with the surface layer made of ultrathin large-piece wood shavings specifically comprises the following steps: (1) preparation of core layer and subsurface layer wood shavings: cutting waste veneers, twigs, slabs and the like into sections by a saw, then making the sections into wood shavings with the length of 60-120mm, the width of 5-40 mm and the thickness of 0.5-1.0mm by a ring type wood shavings machine, and transporting the wood shavings to a wet wood shavings bin for storage;
(2) preparing surface layer wood shavings: the surface layer is made of small-diameter-sized wood and is prepared into ultrathin large-piece wood shavings with the length of 120-160mm, the width of 20-50mm and the thickness of 0.1-0.5mm by a long-material flaker;
(3) drying raw materials: respectively drying the raw materials by adopting a single-channel roller type dryer until the water content is below 3%;
(4) screening raw materials: separating the core, subsurface and skin materials by mechanical screening, and removing impurities contained in the raw materials;
(5) sizing: and the surface layer, the secondary surface layer and the core layer are respectively mixed with glue by a roller glue mixer, and the glue application amount is selected according to different glue types. 2.6 percent of surface MDI glue, 2.5 percent of core layer and subsurface layer;
(6) paving: five layers of oriented pavement are adopted, a core layer is transversely paved, a surface layer of the core layer is longitudinally paved, and the upper surface and the lower surface of the core layer are also longitudinally paved with ultrathin wood shavings in an oriented mode to obtain a plate blank;
(7) hot pressing: a continuous flat press is adopted, the length of the press is 64.4m, the hot pressing temperature is respectively 230-;
(8) and the hot-pressed plate is subjected to cross cutting by a cross cutting saw, plate turning and cooling, plate cutting according to specifications, grading, packaging and warehousing.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the oriented shaving board with the surface layer made of ultrathin large-piece wood shavings has the advantages that the mechanical property of the whole board is greatly improved: the parallel static bending strength is 43.2-60.00MPa, and the water absorption thickness expansion rate in 24 hours is 9-15%; the parallel bending elastic modulus is 7514-;
(2) the oriented strand board with the surface layer of ultrathin large-piece wood chips has low density of 548-3The density deviation is small, and the density deviation is +/-0.01%;
(3) the surface layer of the oriented shaving board is made of ultrathin large-piece wood shavings, the surface is smooth, and the surface roughness is 0.02-0.30 mu m;
(4) the surface layer of the oriented strand board is made of ultrathin large-piece wood shavings, the number of bubbles in unit area is 0/m 2, the surface bursting rate after post treatment is small, the bursting parts exceeding 0.5cm in unit area are smaller than 5 parts on average, and the thickness of the minimum value in example 2 is 1 part/m 2 of 15 mm.
(5) The oriented shaving board with the ultrathin large-piece wood shavings on the surface layer adopts three residues of branch materials, board skins, rotary-cut leftovers and the like as raw materials, adopts small-diameter-grade materials on the surface layer, promotes the comprehensive utilization of resources, increases the value with high efficiency, and reduces the production cost by more than 30 percent; the density of the board is reduced by about 10% by the ultrathin large-piece wood shavings, so that raw materials are saved; the dimensional stability is good, the dimensional stability is averagely +/-0.001%, the water absorption thickness expansion rate is reduced by 20% compared with that of a fiberboard, the processability is good, and the surface can be directly processed by impregnated paper, PVC, veneer and the like; the product has wide application, and can be used for decoration of wood structure buildings, furniture, floors, container bottom plates and the like.
Detailed Description
Example 1 an oriented strand board having a surface layer of ultra-thin large strands and a process for preparing the same
The invention relates to an oriented shaving board with a surface layer made of ultrathin large-piece wood shavings, and a preparation process of the oriented shaving board, which comprises the following steps: preparing core layer and subsurface layer wood shavings, preparing surface layer wood shavings, drying raw materials, screening raw materials, gluing, paving, hot pressing and post-treatment. The method comprises the following specific steps:
(1) preparation of core layer and subsurface layer wood shavings:
the core layer and the subsurface layer are made of rotary-cut waste veneers, twigs, veneers and the like, are manufactured into wood shavings with the length of 60-120mm, the width of 5-40 mm and the thickness of 0.5-1.0mm by a saw segment and a ring type flaking machine, and are transported to a wet wood shavings storage bin for storage.
(2) Preparing surface layer wood shavings:
the surface layer wood shavings are prepared into ultrathin large-piece wood shavings with the length of 120-160mm, the width of 20-50mm and the thickness of 0.1-0.5mm by adopting small-diameter-grade dimension wood materials and a long-material flaker.
(3) Drying raw materials:
and respectively drying the raw materials by adopting a single-channel roller type dryer until the water content is 1.7%.
(4) Screening raw materials:
the core layer, subsurface layer, and skin layer materials are separated by mechanical screening, and impurities contained in the raw materials are removed.
(5) Sizing:
surface layer, subsurface layer, sandwich layer adopt cylinder glue mixer to carry out the glue mixing respectively, and the volume of gluing selects according to gluing the kind difference, and the glue that this embodiment adopted is compound modified resin gluing agent, and the volume of gluing on concrete every layer is: 2.6% of surface layer, 2.5% of core layer and subsurface layer.
The composite modified resin adhesive comprises MDI adhesive, melamine, a natural elm bark extract, a waterproof agent, calcium chloride and a curing agent.
Specifically, the composite modified resin adhesive comprises the following components in parts by weight: 40 parts of MDI glue, 30 parts of melamine, 5 parts of natural elm bark extract, 5 parts of waterproof agent, 2 parts of calcium chloride and 25 parts of curing agent.
The MDI glue has CAS number of 9017-23-8, active ingredient content of 99.4 percent and density of 1.24g/cm3。
The natural elm bark extract is packaged in a 25KG paperboard bucket, the content of the extract is 99%, and the particle size is 80 meshes.
The waterproof agent is a water-based organic silicon fluororesin waterproof agent and sodium dodecyl benzene sulfonate, and the mass ratio of the waterproof agent to the sodium dodecyl benzene sulfonate is 15: 1.
The curing agent is a medium-high temperature curing agent, and has the indexes of: the molecular formula is as follows: c11H14O398.5 percent of effective component, 0.1 percent of tert-butyl hydroperoxide, 0.05 percent of acidity (calculated by benzoic acid), 0.1 percent of moisture, 1.036-1.045 g/cm3 of density, 1.495-1.505 of refractive index, less than or equal to 0.005 percent of total hydrolysable chlorine and less than or equal to 0.0005 percent of Fe.
The preparation method of the composite modified resin adhesive comprises the following steps:
(a) pre-emulsification: putting the above components into a sealed container according to the above proportion, adjusting pressure to 17MPa, heating to 55 deg.C, stirring, starting high pressure homogenizer, homogenizing for 20min, and keeping the container temperature at 55 deg.C.
(b) Step heating: and (b) preserving the mixture in the step (a) for 1.5h at the temperature of 55 ℃, preserving the heat for 2h at the temperature of 62 ℃, preserving the heat for 2.3h at the temperature of 66 ℃, and preserving the heat for 1h at the temperature of 56 ℃.
(c) And (3) cooling: and cooling to room temperature after the heat preservation is finished.
(6) Paving:
five layers of oriented pavement are adopted, the middle core layer is paved transversely, the subsurface layer is paved longitudinally, and the upper and lower surface layers are paved with ultrathin wood shavings in the same longitudinal orientation manner to obtain the slab.
(7) Hot pressing:
A. pre-pressing: uniformly coating 0.2% of deionized water on the upper side and the lower side of a paved plate blank, placing the plate blank on a conveyor belt, conveying the plate blank to a prepressing frame, adjusting the distance between the upper clamping roller and the lower clamping roller of the prepressing frame to be 95% of the thickness of the plate blank, controlling the pressure between the two clamping rollers to be 1.5MPa, and controlling the temperature of the plate blank when the plate blank passes through the upper clamping roller and the lower clamping roller to be 115 ℃ to obtain the prepressing plate blank.
B. Flat pressing: and flatly pressing the pre-pressed slab, and carrying out hot pressing by adopting a continuous flatting press, wherein the length of the press is 64.4m, the hot pressing temperature is 230-.
(8) And (3) post-treatment:
and the hot-pressed plate is subjected to cross cutting by a cross cutting saw, plate turning and cooling, plate cutting according to specifications, grading, packaging and warehousing.
Example 2 oriented strand board having ultra-thin large strands on the surface layer and process for preparing the same
The invention relates to an oriented shaving board with a surface layer made of ultrathin large-piece wood shavings, and a preparation process of the oriented shaving board, which comprises the following steps: preparing core layer and subsurface layer wood shavings, preparing surface layer wood shavings, drying raw materials, screening raw materials, gluing, paving, hot pressing and post-treatment. The method comprises the following specific steps:
(1) preparation of core layer and subsurface layer wood shavings:
the core layer and the subsurface layer are made of rotary-cut waste veneers, twigs, veneers and the like, are manufactured into wood shavings with the length of 60-120mm, the width of 5-40 mm and the thickness of 0.5-1.0mm by a saw segment and a ring type flaking machine, and are transported to a wet wood shavings storage bin for storage.
(2) Preparing surface layer wood shavings:
the surface layer wood shavings are prepared into ultrathin large-piece wood shavings with the length of 120-160mm, the width of 20-50mm and the thickness of 0.1-0.5mm by adopting small-diameter-grade dimension wood materials and a long-material flaker.
(3) Drying raw materials:
and respectively drying the raw materials by adopting a single-channel roller type dryer until the water content is below 3 percent.
(4) Screening raw materials:
the core layer, subsurface layer, and skin layer materials are separated by mechanical screening, and impurities contained in the raw materials are removed.
(5) Sizing:
surface layer, subsurface layer, sandwich layer adopt cylinder glue mixer to carry out the glue mixing respectively, and the volume of gluing selects according to gluing the kind difference, and the glue that this embodiment adopted is compound modified resin gluing agent, and the volume of gluing on concrete every layer is: 2.6% of surface layer, 2.5% of core layer and subsurface layer.
The composite modified resin adhesive comprises MDI adhesive, melamine, a natural elm bark extract, a waterproof agent, calcium chloride and a curing agent.
Specifically, the composite modified resin adhesive comprises the following components in parts by weight: 42 parts of MDI glue, 21 parts of melamine, 6 parts of natural elm bark extract, 2.0 parts of a waterproof agent, 2.5 parts of calcium chloride and 12 parts of a curing agent.
The MDI glue has a product number of 563254, a CAS number of 9017-23-8, an effective component content of 99.7 percent and a density of 1.23g/cm3。
The natural elm bark extract is packaged in a 25KG paperboard bucket, the content of the extract is 99%, and the particle size is 80 meshes.
The waterproof agent is a water-based organic silicon fluororesin waterproof agent and sodium dodecyl benzene sulfonate, and the mass ratio of the waterproof agent to the sodium dodecyl benzene sulfonate is 15: 1.
The curing agent is a medium-high temperature curing agent, and has the indexes of: the molecular formula is as follows: c11H14O398.5 percent of effective component, 0.1 percent of tert-butyl hydroperoxide, 0.05 percent of acidity (calculated by benzoic acid), 0.1 percent of moisture, 1.036-1.045 g/cm3 of density, 1.495-1.505 of refractive index, less than or equal to 0.005 percent of total hydrolysable chlorine and less than or equal to 0.0005 percent of Fe.
The preparation method of the composite modified resin adhesive comprises the following steps:
(a) pre-emulsification: putting the above components into a sealed container according to the above proportion, adjusting pressure to 20.5MPa, heating to 55 deg.C, stirring, starting high pressure homogenizer, homogenizing for 25min, and keeping the temperature of the container at 52 deg.C.
(b) Step heating: and (b) preserving the heat of the mixture in the step (a) for 1.5h at the temperature of 52 ℃, preserving the heat for 1.5h at the temperature of 65 ℃, then preserving the heat for 2.5h at the temperature of 70 ℃, and preserving the heat for 1h at the temperature of 60 ℃.
(c) And (3) cooling: and cooling to room temperature after the heat preservation is finished.
(6) Paving:
five layers of oriented pavement are adopted, the middle core layer is paved transversely, the subsurface layer is paved longitudinally, and the upper and lower surface layers are paved with ultrathin wood shavings in the same longitudinal orientation manner to obtain the slab.
(7) Hot pressing:
A. pre-pressing: uniformly coating 0.35% of deionized water on the upper side and the lower side of a paved plate blank, placing the plate blank on a conveyor belt, conveying the plate blank to a prepressing frame, adjusting the distance between the upper clamping roller and the lower clamping roller of the prepressing frame to be 92% of the thickness of the plate blank, controlling the pressure between the two clamping rollers to be 2.0MPa, and controlling the temperature of the plate blank when the plate blank passes through the upper clamping roller and the lower clamping roller to be 110 ℃ to obtain the prepressing plate blank.
B. Flat pressing: and flatly pressing the pre-pressed slab, and carrying out hot pressing by adopting a continuous flatting press, wherein the length of the press is 64.4m, the hot pressing temperature is 230-.
(8) And (3) post-treatment:
and the hot-pressed plate is subjected to cross cutting by a cross cutting saw, plate turning and cooling, plate cutting according to specifications, grading, packaging and warehousing.
Example 3 oriented strand board having ultra-thin large strands as the surface layer and Process for preparing the same
The invention relates to an oriented shaving board with a surface layer made of ultrathin large-piece wood shavings, and a preparation process of the oriented shaving board, which comprises the following steps: preparing core layer and subsurface layer wood shavings, preparing surface layer wood shavings, drying raw materials, screening raw materials, gluing, paving, hot pressing and post-treatment. The method comprises the following specific steps:
(1) preparation of core layer and subsurface layer wood shavings:
the core layer and the subsurface layer are made of rotary-cut waste veneers, twigs, veneers and the like, are manufactured into wood shavings with the length of 60-120mm, the width of 5-40 mm and the thickness of 0.5-1.0mm by a saw segment and a ring type flaking machine, and are transported to a wet wood shavings storage bin for storage.
(2) Preparing surface layer wood shavings:
the surface layer wood shavings are prepared into ultrathin large-piece wood shavings with the length of 120-160mm, the width of 20-50mm and the thickness of 0.1-0.5mm by adopting small-diameter-grade dimension wood materials and a long-material flaker.
(3) Drying raw materials:
and respectively drying the raw materials by adopting a single-channel roller type dryer until the water content is 2.2%.
(4) Screening raw materials:
the core layer, subsurface layer, and skin layer materials are separated by mechanical screening, and impurities contained in the raw materials are removed.
(5) Sizing:
surface layer, subsurface layer, sandwich layer adopt cylinder glue mixer to carry out the glue mixing respectively, and the volume of gluing selects according to gluing the kind difference, and the glue that this embodiment adopted is compound modified resin gluing agent, and the volume of gluing on concrete every layer is: 2.6% of surface layer, 2.5% of core layer and subsurface layer.
The composite modified resin adhesive comprises MDI adhesive, melamine, a natural elm bark extract, a waterproof agent, calcium chloride and a curing agent.
Specifically, the composite modified resin adhesive comprises the following components in parts by weight: 50 parts of MDI glue, 20 parts of melamine, 20 parts of natural elm bark extract, 1.8 parts of waterproof agent, 5 parts of calcium chloride and 6 parts of curing agent.
The MDI glue has a product number of 563254, a CAS number of 9017-23-8, an effective component content of 99.1 percent and a density of 1.22-1.23g/cm3。
The natural elm bark extract is packaged in a 25KG paperboard bucket, the content of the extract is 99%, and the particle size is 80 meshes.
The waterproof agent is a water-based organic silicon fluororesin waterproof agent and sodium dodecyl benzene sulfonate, and the mass ratio of the waterproof agent to the sodium dodecyl benzene sulfonate is 15: 1.
The curing agent is a medium-high temperature curing agent, and has the indexes of: the molecular formula is as follows: c11H14O398.5 percent of effective component, 0.1 percent of tert-butyl hydroperoxide, 0.05 percent of acidity (calculated by benzoic acid), 0.1 percent of moisture, 1.036-1.045 g/cm3 of density, 1.495-1.505 of refractive index, less than or equal to 0.005 percent of total hydrolysable chlorine and less than or equal to 0.0005 percent of Fe.
The preparation method of the composite modified resin adhesive comprises the following steps:
(a) pre-emulsification: putting the above components into a sealed container according to the above proportion, adjusting pressure to 22MPa, heating to 52 deg.C, stirring, starting high pressure homogenizer, homogenizing for 27min, and keeping the temperature of the container at 48 deg.C.
(b) Step heating: and (b) preserving the heat of the mixture in the step (a) for 1h at the temperature of 52 ℃, preserving the heat for 1h at the temperature of 66 ℃, preserving the heat for 2h at the temperature of 72 ℃, and preserving the heat for 1h at the temperature of 60 ℃.
(c) And (3) cooling: and cooling to room temperature after the heat preservation is finished.
(6) Paving:
five layers of oriented pavement are adopted, the middle core layer is paved transversely, the subsurface layer is paved longitudinally, and the upper and lower surface layers are paved with ultrathin wood shavings in the same longitudinal orientation manner to obtain the slab.
(7) Hot pressing:
A. pre-pressing: uniformly coating 0.5% of deionized water on the upper side and the lower side of a paved plate blank, placing the plate blank on a conveyor belt, conveying the plate blank to a prepressing frame, adjusting the distance between an upper clamping roller and a lower clamping roller of the prepressing frame to be 90% of the thickness of the plate blank, controlling the pressure between the two clamping rollers to be 2.2MPa, and controlling the temperature of the plate blank when the plate blank passes through the upper clamping roller and the lower clamping roller to be 105 ℃ to obtain the prepressing plate blank.
B. Flat pressing: and flatly pressing the pre-pressed slab, and carrying out hot pressing by adopting a continuous flatting press, wherein the length of the press is 64.4m, the hot pressing temperature is 230-.
(8) And (3) post-treatment:
and the hot-pressed plate is subjected to cross cutting by a cross cutting saw, plate turning and cooling, plate cutting according to specifications, grading, packaging and warehousing.
The oriented strand board with the surface layer made of ultrathin large-piece wood shavings has the technical effects that:
the raw materials used in the invention are twigs, slabs, rotary-cut leftovers and other three residues, and the surface layer is made of small-diameter-grade standard materials, so that the comprehensive utilization of resources is promoted, the value is increased efficiently, and the production cost is reduced by more than 30%; the density of the board is reduced by about 10% by the ultrathin large-piece wood shavings, so that raw materials are saved; the parallel static bending can reach 43.2-60.00MPa, and the elastic modulus can reach 7514-9980 MPa; the size stability is good, the water absorption thickness expansion rate is reduced by 20% compared with a fiberboard, the processing performance is good, and the surface can be directly processed by impregnated paper, PVC, veneer and the like; the product has wide application, and can be used for decoration of wood structure buildings, furniture, floors, container bottom plates and the like.
The oriented shaving board with the surface layer made of ultrathin large shavings, disclosed by the invention, has the advantages that the surface layer is made of the ultrathin large shavings, the defect that the shavings on the surface layer are ultrathin and are easy to bubble after hot pressing is overcome, the uniformity of the water content of the shavings is difficult to control uniformly, and the heated surface layer is especially easy to crack.
The oriented strand board with the surface layer of ultrathin large flakes is detected according to the detection method specified by LY/T1580-2010, and the detection results are shown in the following table 1:
table 1: the invention discloses a detection result of an oriented shaving board with ultrathin large-piece wood shavings on the surface layer
As can be seen from the above table, the oriented strand board with the surface layer of ultrathin large flakes according to the present invention has the following beneficial effects:
(1) the oriented shaving board with the surface layer made of ultrathin large-piece wood shavings has the advantages that the mechanical property of the whole board is greatly improved: the parallel static bending strength is 43.2-60.00MPa, and the water absorption thickness expansion rate in 24 hours is 9-15%; the parallel bending elastic modulus is 7514-;
(2) the oriented strand board with the surface layer of ultrathin large-piece wood chips has low density of 548-3The density deviation is small, and the density deviation is +/-0.01%;
(3) the surface layer of the oriented shaving board is made of ultrathin large-piece wood shavings, the surface is smooth, and the surface roughness is 0.02-0.30 mu m;
(4) the oriented shaving board with the surface layer made of ultrathin large-piece wood shavings has the number of bubbles per unit area of 0/m2And the surface after post-treatment has a small rate of cracks, the average number of cracks exceeding 0.5cm per unit area is less than 5, and the minimum number of cracks is 0/m of 15mm in example 22。
All percentages used herein are weight percentages and all ratios described herein are mass ratios, unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A process for preparing an oriented strand board with a surface layer of ultrathin large flakes,
the preparation process comprises the steps of preparation of the core layer and the subsurface layer wood shavings, preparation of the surface layer wood shavings, raw material drying, gluing, paving, hot pressing and post-treatment.
2. The process of claim 1, wherein the hot pressing is carried out at five different temperatures and pressures, the length of the press is 64.4m, and the hot pressing factor is 4-8 mm/s.
3. The process for preparing an oriented strand board with an ultrathin large-piece shaving surface layer as claimed in claim 2, wherein the hot-pressing pressure of the five stages of hot-pressing is 2.6-3MPa, 1.8-2.5MPa, 1.0-1.7MPa, 0.5-0.9MPa, 0.1-0.4MPa, and the hot-pressing temperature is 230-.
4. The process of claim 1, wherein said sizing is carried out in a manner such that said surface layer is made of ultra-thin strands of wood, said surface layer being made of MDI glue 2.6%, and said core layer and said subsurface layer being made of 2.5%.
5. A process according to claim 1, wherein the core and the sublayer strands are prepared in a size such that: 60-120mm, 5-40 mm wide and 0.5-1.0mm thick.
6. The process of claim 1, wherein the surface layer is made of ultra-thin large flakes, and the surface layer is made of the following size: 120mm, 160mm in width, 20-50mm in width and 0.1-0.5mm in thickness.
7. The process for preparing an oriented strand board with an ultrathin large-piece wood shaving surface layer as claimed in claim 1, wherein the glue used for sizing is a composite modified resin adhesive, and the composite modified resin adhesive comprises MDI glue, melamine, a natural elm bark extract, a waterproof agent 1.8%, calcium chloride and a curing agent.
8. The process for preparing the oriented strand board with the ultrathin large-sized wood shavings as the surface layer as claimed in claim 7, wherein the composite modified resin adhesive comprises the following components in parts by weight: 40-50 parts of MDI glue, 20-30 parts of melamine, 5-20 parts of natural elm bark extract, 1.8-10 parts of waterproof agent, 2-5 parts of calcium chloride and 6-25 parts of curing agent.
9. The process for preparing the oriented strand board with the ultrathin large-piece wood shavings as the surface layer according to claim 7, wherein the MDI glue has the CAS number of 9017-23-8, the content of active ingredients of more than or equal to 99 percent, and the density of 1.22-1.24g/cm3。
10. The oriented strand board with the surface layer made of ultrathin large-piece wood chips is characterized by comprising the oriented strand board with the surface layer made of the ultrathin large-piece wood chips, wherein the parallel bending elastic modulus is 7514-9980MPa, and the internal bonding strength is 2.0-2.5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911331584.XA CN110948630A (en) | 2019-12-21 | 2019-12-21 | Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911331584.XA CN110948630A (en) | 2019-12-21 | 2019-12-21 | Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110948630A true CN110948630A (en) | 2020-04-03 |
Family
ID=69983353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911331584.XA Pending CN110948630A (en) | 2019-12-21 | 2019-12-21 | Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110948630A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116175725A (en) * | 2023-02-24 | 2023-05-30 | 巴中建丰新材料有限公司 | LSB board production method and LSB board |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1768388A1 (en) * | 1989-02-15 | 1992-10-15 | Volgodonskij Kom Drevesnykh Pl | Method of producing chip boards |
| CN103770187A (en) * | 2012-10-19 | 2014-05-07 | 北京泛欧瑞得科技有限公司 | Special type oriented strand board and manufacturing process thereof |
| CN106346589A (en) * | 2016-08-29 | 2017-01-25 | 广西横县新威林板业有限公司 | Method for manufacturing anti-insect and anti-mold oriented strand board with full eucalyptus leftover materials |
| EP3178622A1 (en) * | 2015-12-07 | 2017-06-14 | SWISS KRONO Tec AG | Wood material board with reduced emission of volatile organic compounds (vocs) and method for their preparation |
| CN107984589A (en) * | 2017-12-31 | 2018-05-04 | 寿光市鲁丽木业股份有限公司 | A kind of high-strength directional particieboard and its production method |
| CN108908646A (en) * | 2018-08-16 | 2018-11-30 | 广西横县新威林板业有限公司 | A kind of bamboo wood of high intensity and oriented wood chipboard composite plate and preparation method thereof |
| CN110091409A (en) * | 2019-06-06 | 2019-08-06 | 江苏慧典新材有限公司 | A kind of low-density can facing oriented wood chipboard |
| CN110103306A (en) * | 2018-02-01 | 2019-08-09 | 寿光市鲁丽木业股份有限公司 | A kind of surface layer is the oriented structure chipboard and its production method of fiber |
-
2019
- 2019-12-21 CN CN201911331584.XA patent/CN110948630A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1768388A1 (en) * | 1989-02-15 | 1992-10-15 | Volgodonskij Kom Drevesnykh Pl | Method of producing chip boards |
| CN103770187A (en) * | 2012-10-19 | 2014-05-07 | 北京泛欧瑞得科技有限公司 | Special type oriented strand board and manufacturing process thereof |
| EP3178622A1 (en) * | 2015-12-07 | 2017-06-14 | SWISS KRONO Tec AG | Wood material board with reduced emission of volatile organic compounds (vocs) and method for their preparation |
| CN106346589A (en) * | 2016-08-29 | 2017-01-25 | 广西横县新威林板业有限公司 | Method for manufacturing anti-insect and anti-mold oriented strand board with full eucalyptus leftover materials |
| CN107984589A (en) * | 2017-12-31 | 2018-05-04 | 寿光市鲁丽木业股份有限公司 | A kind of high-strength directional particieboard and its production method |
| CN110103306A (en) * | 2018-02-01 | 2019-08-09 | 寿光市鲁丽木业股份有限公司 | A kind of surface layer is the oriented structure chipboard and its production method of fiber |
| CN108908646A (en) * | 2018-08-16 | 2018-11-30 | 广西横县新威林板业有限公司 | A kind of bamboo wood of high intensity and oriented wood chipboard composite plate and preparation method thereof |
| CN110091409A (en) * | 2019-06-06 | 2019-08-06 | 江苏慧典新材有限公司 | A kind of low-density can facing oriented wood chipboard |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116175725A (en) * | 2023-02-24 | 2023-05-30 | 巴中建丰新材料有限公司 | LSB board production method and LSB board |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104626292B (en) | One can facing oriented wood chipboard and preparation technology thereof | |
| CN106363714B (en) | The method that environmentally friendly particieboard is produced using full Eucalyptus leftover pieces continuous hot-press | |
| US10399244B2 (en) | Method of manufacture of medium and high density fibreboard with moisture and mildew resistance and low formaldehyde level | |
| CN101456195B (en) | Structure plywood plate for timber-construction and production method thereof | |
| CN100548603C (en) | The manufacture method of high-strength anti-corrosion integrated material | |
| WO2020258682A1 (en) | Formaldehyde-free medium and high-density board supporting deep overcoating and manufacturing method thereof | |
| CN101342723B (en) | Method for manufacturing sunflower artificial board of straw | |
| CN106182328B (en) | The method that sieve method screens the production particieboard of the bark in full Eucalyptus leftover pieces twice | |
| CN100358712C (en) | Manufacturing method of high strength high wear resistant Yiyang cement mould board | |
| CN102085677A (en) | New process for producing wooden composite material by using waste and used plywood cement templates | |
| CN104493944B (en) | A kind of P2 height tabula rasa processing method | |
| CN105328762A (en) | Machining technology for shaving board | |
| CN105171883A (en) | Manufacturing method for bamboo and wood oriented strand board for bottom plates of containers | |
| CN105082316A (en) | Production process for eucalyptus veneer formaldehyde-free shaving board | |
| CN102555007A (en) | Method for manufacturing modified hard reconstituted timber | |
| CN110948630A (en) | Oriented strand board with surface layer made of ultrathin large-piece wood shavings and preparation process of oriented strand board | |
| WO2021022445A1 (en) | Wooden fireproof pressure-treated board and manufacturing method therefor | |
| CN114055591B (en) | Preparation method of bamboo-wood particle board | |
| CN101973051A (en) | Production method of poplar laminated veneer lumber composite decorative plate | |
| US10695946B2 (en) | Method of manufacture of medium and high density fibreboard with moisture and mildew resistance and low formaldehyde level | |
| CN108214796B (en) | Environment-friendly high-strength oriented strand board and production method thereof | |
| CN108214795B (en) | High-strength oriented strand board with good moisture resistance and production method thereof | |
| CN106217576A (en) | A kind of Masson Pine Mianzhu laminated particle-board | |
| CN109624014A (en) | It is a kind of can facing multiple-layered wood chipboard production technology | |
| CN110802704A (en) | Composite batten based on combination of glass fiber reinforced plastic fibers and waste wood boards and production process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200403 |