CN113459238B - Low-density veneerable oriented strand board and preparation method thereof - Google Patents

Low-density veneerable oriented strand board and preparation method thereof Download PDF

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Publication number
CN113459238B
CN113459238B CN202110718027.4A CN202110718027A CN113459238B CN 113459238 B CN113459238 B CN 113459238B CN 202110718027 A CN202110718027 A CN 202110718027A CN 113459238 B CN113459238 B CN 113459238B
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layer
surface layer
accounting
oriented strand
density
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CN113459238A (en
Inventor
葛立军
李佰志
李晓升
刘晓攀
胡立鹏
张秀南
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Hunan Luli Wood Industry Co ltd
Jiangxi Luli Wood Co ltd
Shouguang Luli Wood Co ltd
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Shouguang Luli Wood Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/10Moulding of mats
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27LREMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/02Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N1/00Pretreatment of moulding material
    • B27N1/02Mixing the material with binding agent
    • B27N1/0209Methods, e.g. characterised by the composition of the agent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/10Moulding of mats
    • B27N3/14Distributing or orienting the particles or fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/18Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/18Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B27N3/183Forming the mat-edges, e.g. by cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/20Moulding or pressing characterised by using platen-presses
    • B27N3/203Moulding or pressing characterised by using platen-presses with heating or cooling means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10Inorganic fibres
    • B32B2262/101Glass fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/06Vegetal particles
    • B32B2264/062Cellulose particles, e.g. cotton
    • B32B2264/067Wood particles

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

The invention provides a low-density veneerable oriented strand board which is of an eight-layer structure, wherein a middle core layer is of two layers, the middle core layer is an upper surface layer, an upper glass fiber layer and an upper fine material surface layer in sequence from top to bottom, and the middle core layer is a lower surface layer, a lower glass fiber layer and a lower fine material surface layer in sequence from bottom to top. The invention also provides a low-density veneered oriented strand board and a preparation method thereof, and the method comprises the steps of slicing, slicing drying, gluing, paving and forming, prepressing, hot pressing and the like. The low-density veneerable oriented strand board prepared by the invention has small density, good bonding strength, static bending strength, elastic modulus and water absorption expansion rate, and does not use an aldehyde-containing adhesive and cause damage to human bodies.

Description

Low-density veneerable oriented strand board and preparation method thereof
Technical Field
The invention relates to a low-density veneered oriented strand board and a preparation method thereof, belonging to the field of oriented strand boards.
Background
But veneer oriented strand board is the novel panel in the china panel market, and its stable performance can direct secondary veneer, and not only the environmental protection has oriented strand board and ordinary shaving board each item advantage concurrently, when making each item performance obtain optimizing, more accords with the house market actual need.
The group standard of faced oriented strand board is formally implemented in 2018, 2 months and 1 day, the boards sold in the market at present are mainly made of pine wood, the density of the boards produced by the tree is higher, and the density is generally 610-700 kg/cm 3 The color of the board is darker and blue-turning is easy to occur. Pine wood is long in production period and high in price, does not belong to fast growing wood encouraged by the state, and is high in production cost. In addition, at present, the surface material of the faced oriented strand board is produced by using a sieve ring type grinding machine, a mechanical or mechanical aerated flow spreading machine is used for spreading, the surface fine material of the produced product is similar to the surface of a common strand board, and the surface of the product has a larger difference with the surface of a fiber board.
CN211941327U discloses a veneer multilayer structure shaving board, the middle core layer uses straw material, under the condition of ensuring that the product quality is equivalent to the prior art, the wood raw material is saved, the manufacturing cost is reduced, but the strength is still poor, and the water absorption expansion rate is high. CN109624016A discloses a manufacturing process of super-strong shaving board for changing the shape and structure of wood shavings, the strength of the super-strong shaving board is close to or even reaches the strength level of a block board or a plywood, besides the obvious characteristics of saving more materials due to the highest mechanical strength of boards with the same density and the lowest density of boards with the same density, the mechanical property of the shaving board is greatly improved due to the uniform and compact structure of the product, therefore, the super-strong shaving board has the advantages of stable size, no deformation, small thickness tolerance and the like, and the transformation and upgrading of the artificial board industry, particularly the shaving board industry, are greatly promoted. But the density is too high, the bonding strength and the static bending strength are too low, and the use of the adhesive containing aldehyde can cause damage to human bodies.
The prior art has the following problems:
(1) the density of the plate is high;
(2) the static bending strength is low;
(3) the elastic modulus is small;
(4) the bonding strength is insufficient;
(5) the expansion rate is high after water absorption;
(6) the use of adhesives containing aldehydes causes damage to human health.
Disclosure of Invention
The invention solves the defects of the prior art, provides a low-density veneerable oriented strand board and a preparation method thereof, and realizes the following purposes:
(1) the density of the plate is low;
(2) the static bending strength is high;
(3) the elastic modulus is large;
(4) the bonding strength is high;
(5) the expansion rate is small after water absorption;
(6) the aldehyde-containing adhesive is not used, so that the harm to the health of human bodies is avoided.
In order to solve the technical problems, the invention adopts the following technical scheme:
the low-density veneerable oriented strand board is characterized in that the low-density veneerable oriented strand board is of an eight-layer structure, a middle core layer is of two layers, the middle core layer is sequentially a last surface layer, an upper glass fiber layer and an upper fine material surface layer from top to bottom, and the middle core layer is sequentially a next surface layer, a lower glass fiber layer and a lower fine material surface layer from bottom to top.
The following is a further improvement of the above technical solution:
the preparation method specifically comprises the following steps:
(1) planing piece
Respectively sending poplar, fir, pine and bamboo into a flaker for flaking to obtain poplar, fir, pine and bamboo flakes, and obtaining poplar and fir flakes: length 50-70mm, width 15-25mm, thickness 0.6-0.8 mm; pine and bamboo shavings: length 80mm-120mm, width 20mm-30mm, thickness 0.3-0.5 mm;
feeding sorghum stalks into a pulverizer to be pulverized to obtain sorghum stalk powder;
after all the chips and the powder are produced, the chips and the powder are respectively transferred to a wet wood shaving bin.
(2) Drying of the flakes
The drying system is started to preheat, feeding is started when the drying inlet temperature is 240-260 ℃, the outlet temperature is 100-120 ℃, prepared chips and powder are conveyed into the drying machine from the wet wood shaving bin by the belt conveyor, the rotating speed of the drying cylinder is set to be 1.5-2.5r/min during feeding, and the discharging amount of the wet wood shaving bin is 13-17T/h. The outlet temperature cannot exceed 120 ℃ and 140 ℃ in the drying process to obtain dried sliced pieces and crushed powder, and the moisture content of the dried sliced pieces and the dried crushed powder is 2.2-2.7%;
and after drying, the poplar and fir chips are sent into a sublayer shaving dry bin, the pine and bamboo chips are sent into a middle core layer shaving dry bin, and the crushed sorghum stalks are sent into a fine material surface layer dry bin for storage.
(3) Sizing
Feeding the subsurface wood shavings into a roller type subsurface wood shavings blender, adding 2.0-3.0% of isocyanate, 1.0-2.0% of ethyl acetate, 1.5-2.5% of epoxy resin, 1.5-2.5% of talcum powder, 0.7-1.5% of hydrated alumina, 0.5-1.0% of paraffin emulsion and 0.3-0.7% of palm wax;
putting the middle core layer wood shavings into a roller type middle core layer wood shavings mixing machine, adding 3.0-4.0% of isocyanate, 1.5-2.5% of ethyl acetate, 1.5-2.5% of dibutyl phthalate, 1.0-2.0% of talcum powder, 1.0-2.0% of hydrated alumina, 0.3-0.5% of paraffin emulsion and 0.3-0.7% of palm wax;
feeding the fine material surface layer into a spiral stirring type glue mixer, and adding 2.5-3.0% of isocyanate, 1.5-2.5% of ethyl acetate, 1.0-2.0% of dibutyl phthalate, 1.5-2.5% of talcum powder, 0.7-1.5% of hydrated alumina, 0.3-0.7% of paraffin emulsion and 0.5-1.0% of palm wax;
spraying water to the wood shavings after glue mixing. The water content of the fine material surface layer wood shavings is 9-11%, the water content of the subsurface layer wood shavings is 4-5%, and the water content of the middle core layer wood shavings is 4.5-5.5%;
and conveying the glued wood shavings to each paving metering bin through a scraper conveyor and a belt conveyor for storage so as to prepare for paving.
(4) Paving, forming and prepressing
And conveying the glued wood shavings to a paving machine from a paving metering bin for paving, wherein the mass ratio of the paving wood shavings is 45-55% of the subsurface layer, 20-25% of the middle core layer, 20-30% of the fine material surface layer, the mass ratio of the wood shavings of the subsurface layer to the poplar shavings of the China fir is 0.5-1.2:1, and the mass ratio of the pine shavings of the middle core layer to the bamboo shavings of the China fir is 1-2: 1.
The paving sequence is that the middle core layer is upward sequentially a last surface layer, an upper glass fiber layer and an upper fine material surface layer, and the middle core layer is downward sequentially a next surface layer, a lower glass fiber layer and a lower fine material surface layer. The cross section of the paved plate blank is uniform in thickness, the upper and lower fine material surface layers cover the upper and lower glass fiber layers and the upper and lower secondary surface layers, the middle core layer is two layers, pavement is carried out twice in the same direction, the last time surface layer sliced piece faces one direction, the included angle between the last time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, the next time surface layer sliced piece faces one direction, the included angle between the next time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, the fine material surface layer powder is uniformly distributed, the plate blank moving speed is 170 plus 220mm/s, and the metal impurities in the paved plate blank are adsorbed, separated and removed by permanent magnets in the transportation process;
paving and forming, and then performing prepressing to obtain a plate blank;
the mesh size of the glass fiber layer is 0.5 x 0.5mm, and the thickness is 0.1 mm.
(5) Hot pressing
The slab after pavement molding enters a continuous press through belt transportation, the frame temperature of the press is 240 ℃ in the first area 220, 230 ℃ in the second area 200, 230 ℃ in the third area 200, 220 ℃ in the fourth area 190, 200 ℃ in the fifth area 180, the hot pressing time (the hot pressing factor is 8-12 s/mm), the pressure in the first area is 2.0-2.4N/mm, the pressure in the second area is 1.0-1.4N/mm, the pressure in the third area is 0.8-1.2N/mm, the pressure in the fourth area is 0.6-0.9N/mm and the pressure in the fifth area is 0.4-0.7N/mm;
the plate blank is subjected to a series of physical and chemical changes through high temperature and high pressure to obtain the formed plain plate.
(6) Post-treatment
And the formed plain plate after hot pressing is sent into a plate airing frame for cooling after being sawed longitudinally and transversely. And cutting the cooled plain board again by a center saw, sanding the plain board in a sander, and stacking the plain board in a stacking station after sanding to obtain a formed board, namely the veneerable oriented strand board, wherein the thickness of the board of the veneerable oriented strand board is 18.32-18.47 mm.
The invention has the beneficial effects that:
(1) the density of the low-density veneered oriented strand board prepared by the method is 0.45-0.49g/cm in the year;
(2) the static bending strength of the low-density veneered oriented strand board prepared by the invention is parallel to 35.2-36.2MPa and vertical to 19.7-20.1 MPa;
(3) the elastic modulus of the low-density veneered oriented strand board prepared by the method is parallel to 4732-2958 MPa and perpendicular to 2898-2934 MPa;
(4) the internal bonding strength of the low-density veneered oriented strand board prepared by the invention is 1.45-1.54 MPa;
(5) the surface bonding strength of the low-density veneerable oriented shaving board prepared by the invention is 1.41-1.44 MPa;
(6) the low-density veneered oriented strand board prepared by the invention has the screw holding force 1592 and 1623N;
(7) the low-density veneered oriented strand board prepared by the method has the water absorption thickness expansion rate of 4.3-4.5% after 24 hours.
Detailed Description
Example 1
(1) Planing piece
Respectively sending poplar, fir, pine and bamboo into a flaker for flaking to obtain poplar, fir, pine and bamboo flakes, and obtaining poplar and fir flakes: length 50-70mm, width 15-25mm, thickness 0.6-0.8 mm; pine and bamboo chipping: length 80mm-120mm, width 20mm-30mm, thickness 0.3-0.5 mm;
feeding sorghum stalks into a grinder to be ground to obtain sorghum stalk powder;
after all the flakes and the powder are produced, the flakes and the powder are respectively transferred to a wet wood shaving bin.
(2) Drying of the flakes
And starting a drying system to preheat, starting feeding when the drying inlet temperature is 250 ℃ and the outlet temperature is 110 ℃, conveying prepared chips and powder from a wet wood shaving bin to a dryer by a belt conveyor, setting the rotating speed of a drying cylinder at 2.0r/min during feeding, and setting the discharging amount of the wet wood shaving bin at 15T/h. The outlet temperature cannot exceed 130 ℃ in the drying process, dried sliced sheets and dried powder are obtained, and the water content of the dried sliced sheets and the dried powder is 2.5%;
and after drying, the poplar and fir chips are sent into a sublayer shaving dry bin, the pine and bamboo chips are sent into a middle core layer shaving dry bin, and the crushed sorghum stalks are sent into a fine material surface layer dry bin for storage.
(3) Sizing
Feeding the subsurface wood shavings into a roller type subsurface wood shavings mixing machine, and adding isocyanate accounting for 2.5 percent of the mass of the subsurface wood shavings, 1.5 percent of ethyl acetate, 2 percent of epoxy resin, 2 percent of talcum powder, 1 percent of hydrated alumina, 0.7 percent of paraffin emulsion and 0.5 percent of palm wax;
putting the middle core layer wood shavings into a roller type middle core layer wood shavings mixing machine, and adding isocyanate accounting for 3.5% of the mass of the middle core layer wood shavings, 2% of ethyl acetate, 2% of dibutyl phthalate, 1.5% of talcum powder, 1.5% of hydrated alumina, 0.4% of paraffin emulsion and 0.5% of palm wax;
feeding the fine material surface layer into a spiral stirring type glue mixer, and adding isocyanate accounting for 2.8% of the fine material surface layer, 2% of ethyl acetate, 1.5% of dibutyl phthalate, 2% of talcum powder, 1% of hydrated alumina, 0.5% of paraffin emulsion and 0.7% of palm wax;
spraying water to the wood shavings after glue mixing. The water content of the fine material surface layer wood shavings is 10%, the water content of the subsurface layer wood shavings is 4.5%, and the water content of the middle core layer wood shavings is 5%;
and conveying the glued wood shavings to each paving metering bin through a scraper conveyor and a belt conveyor for storage so as to prepare for paving.
(4) Paving, forming and prepressing
And conveying the glued wood shavings to a paving machine from a paving metering bin for paving, wherein the mass ratio of the paving wood shavings is 50% of the subsurface layer, 20% of the middle core layer and 30% of the fine material surface layer, the mass ratio of the subsurface layer poplar wood shavings to the cedar wood shavings is 1:1, and the mass ratio of the middle core layer pine wood shavings to the bamboo shavings is 1.5: 1.
The paving sequence is that the middle core layer is upward sequentially a last surface layer, an upper glass fiber layer and an upper fine material surface layer, and the middle core layer is downward sequentially a next surface layer, a lower glass fiber layer and a lower fine material surface layer. The cross section of the paved plate blank is uniform in thickness, the upper and lower fine material surface layers cover the upper and lower glass fiber layers and the upper and lower secondary surface layers, the middle core layer is two layers, paving is carried out twice in the same direction, the last time surface layer sliced piece faces one direction, the included angle between the last time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, the next time surface layer sliced piece faces one direction, the included angle between the next time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, fine material surface layer powder is uniformly distributed, the plate blank moving speed is 200mm/s, and metal impurities in the paved plate blank are adsorbed, separated and removed by permanent magnets in the transportation process;
paving and forming, and then performing prepressing to obtain a plate blank;
the mesh size of the glass fiber layer is 0.5 x 0.5mm, and the thickness is 0.1 mm.
(5) Hot pressing
The formed slab is transported into a continuous press through a belt, the frame temperature of the press is first 230 ℃, second 220 ℃, third 220 ℃, fourth 210 ℃, fifth 190 ℃, the hot pressing time (hot pressing factor 10 s/mm), first 2.2N/mm pressure, second 1.2N/mm pressure, third 1.0N/mm pressure, fourth 0.7N/mm pressure and fifth 0.5N/mm pressure;
the plate blank is subjected to a series of physical and chemical changes through high temperature and high pressure to obtain the formed plain plate.
(6) Post-treatment
And the formed plain plate after hot pressing is sent into a plate airing frame for cooling after being sawed longitudinally and transversely. And cutting the cooled plain board again by a center saw, sanding the plain board in a sander, and stacking the plain board in a stacking station to obtain a formed board, namely the veneer-faced oriented strand board, wherein the thickness of the veneer-faced oriented strand board is 18.37 mm.
The beneficial effects of this embodiment:
(1) the density of the low-density veneered oriented strand board prepared in this example was 0.45g/cm thin shoots;
(2) the static bending strength of the low-density veneered oriented strand board prepared by the embodiment is parallel to 36.2MPa and vertical to 20.1 MPa;
(3) the elastic modulus of the low-density veneered oriented strand board prepared by the embodiment is parallel to 4758MPa and perpendicular to 2934 MPa;
(4) the bonding strength in the low-density veneered oriented strand board prepared by the embodiment is 1.54 MPa;
(5) the surface bonding strength of the low-density veneerable oriented shaving board prepared by the embodiment is 1.44 MPa;
(6) the low density veneered oriented strand board prepared in this example had a screw grip 1623N;
(7) the low-density veneered oriented strand board prepared in the embodiment has a water absorption thickness expansion rate of 4.3% after 24 h.
Example 2
(1) Planing piece
Respectively sending poplar, fir, pine and bamboo into a flaker for flaking to obtain poplar, fir, pine and bamboo flakes, and obtaining poplar and fir flakes: length 50-70mm, width 15-25mm, thickness 0.6-0.8 mm; pine and bamboo chipping: length 80mm-120mm, width 20mm-30mm, thickness 0.3-0.5 mm;
feeding sorghum stalks into a pulverizer to be pulverized to obtain sorghum stalk powder;
after all the chips and the powder are produced, the chips and the powder are respectively transferred to a wet wood shaving bin.
(2) Drying of the flakes
And starting a drying system to preheat, starting feeding when the drying inlet temperature is 240 ℃ and the outlet temperature is 100 ℃, conveying prepared chips and powder into a dryer from a wet wood shaving bin by a belt conveyor, setting the rotating speed of a drying cylinder at 1.5r/min during feeding, and setting the discharging amount of the wet wood shaving bin at 13T/h. The outlet temperature cannot exceed 120 ℃ in the drying process, dried sliced sheets and dried powder are obtained, and the water content of the dried sliced sheets and the dried powder is 2.2%;
and after drying, the poplar and fir chips are sent into a sublayer shaving dry bin, the pine and bamboo chips are sent into a middle core layer shaving dry bin, and the crushed sorghum stalks are sent into a fine material surface layer dry bin for storage.
(3) Sizing
Feeding the subsurface wood shavings into a roller type subsurface wood shavings blender, and adding isocyanate accounting for 2.0 percent of the mass of the subsurface wood shavings, 1.0 percent of ethyl acetate, 1.5 percent of epoxy resin, 1.5 percent of talcum powder, 0.7 percent of hydrated alumina, 0.5 percent of paraffin emulsion and 0.3 percent of palm wax;
putting the middle core layer wood shavings into a roller type middle core layer wood shavings mixing machine, and adding isocyanate accounting for 3.0 percent of the mass of the middle core layer wood shavings, 1.5 percent of ethyl acetate, 1.5 percent of dibutyl phthalate, 1.0 percent of talcum powder, 1.0 percent of hydrated alumina, 0.3 percent of paraffin emulsion and 0.3 percent of palm wax;
feeding the fine material surface layer into a spiral stirring type glue mixer, and adding isocyanate accounting for 2.5 percent of the mass of the fine material surface layer, 1.5 percent of ethyl acetate, 1.0 percent of dibutyl phthalate, 1.5 percent of talcum powder, 0.7 percent of hydrated alumina, 0.3 percent of paraffin emulsion and 0.5 percent of palm wax;
spraying water to the wood shavings after glue mixing. The water content of the fine material surface layer wood shavings is 9 percent, the water content of the subsurface layer wood shavings is 4.0 percent, and the water content of the middle core layer wood shavings is 4.5 percent;
and conveying the glued wood shavings to each paving metering bin through a scraper conveyor and a belt conveyor for storage so as to prepare for paving.
(4) Paving, forming and prepressing
And conveying the glued wood shavings to a paving machine from a paving metering bin for paving, wherein the mass ratio of the paving wood shavings is 55% of the subsurface layer, 25% of the middle core layer and 20% of the fine material surface layer, the mass ratio of the subsurface layer poplar wood shavings to the cedar wood shavings is 0.5:1, and the mass ratio of the middle core layer pine wood shavings to the bamboo shavings is 1: 1.
The paving sequence is that the middle core layer is upward sequentially a last surface layer, an upper glass fiber layer and an upper fine material surface layer, and the middle core layer is downward sequentially a next surface layer, a lower glass fiber layer and a lower fine material surface layer. The cross section of the paved plate blank is uniform in thickness, the upper and lower fine material surface layers cover the upper and lower glass fiber layers and the upper and lower secondary surface layers, the middle core layer is two layers, paving is carried out twice in the same direction, the last time surface layer sliced piece faces one direction, the included angle between the last time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, the next time surface layer sliced piece faces one direction, the included angle between the next time surface layer and the last time surface layer is 90 degrees, the fine material surface layer powder is uniformly distributed, the plate blank moving speed is 170mm/s, and the permanent magnet is used for adsorbing, separating and removing metal impurities in the paved plate blank in the transportation process;
paving and forming, and then performing prepressing to obtain a plate blank;
the mesh size of the glass fiber layer is 0.5 x 0.5mm, and the thickness is 0.1 mm.
(5) Hot pressing
The paved and formed slab enters a continuous press through belt transportation, the frame temperature of the press is 220 ℃ in a first region, 200 ℃ in a second region, 200 ℃ in a third region, 190 ℃ in a fourth region, 180 ℃ in a fifth region, the hot pressing time (hot pressing factor 8 s/mm), the pressure of the first region is 2.0N/mm, the pressure of the second region is 1.0N/mm, the pressure of the third region is 0.8N/mm, the pressure of the fourth region is 0.6N/mm, and the pressure of the fifth region is 0.4N/mm;
the plate blank is subjected to a series of physical and chemical changes through high temperature and high pressure to obtain the formed plain plate.
(6) Post-treatment
And the formed plain plate after hot pressing is sent into a plate airing frame for cooling after being sawed longitudinally and transversely. And cutting the cooled plain board again by a center saw, sanding the plain board in a sander, and stacking the plain board in a stacking station to obtain a formed board, namely the veneer-faced oriented strand board, wherein the thickness of the veneer-faced oriented strand board is 18.32 mm.
The beneficial effects of this embodiment:
(1) the density of the low-density veneered oriented strand board prepared in this example was 0.49g/cm thin shoots;
(2) the static bending strength of the low-density veneered oriented strand board prepared by the embodiment is parallel to 35.7MPa and vertical to 19.8 MPa;
(3) the elastic modulus of the low-density veneered oriented strand board prepared by the embodiment is parallel to 4732MPa and perpendicular to 2898 MPa;
(4) the internal bonding strength of the low-density veneered oriented strand board prepared by the embodiment is 1.47 MPa;
(5) the surface bonding strength of the low-density veneerable oriented shaving board prepared by the embodiment is 1.39 MPa;
(6) the low density veneerable oriented strand board prepared in this example held screw force 1601N;
(7) the low-density veneerable oriented strand board prepared in the embodiment has a water absorption thickness expansion rate of 4.4% after 24 h.
Example 3
(1) Planing piece
Respectively feeding poplar, fir, pine and bamboo into a flaker for flaking to obtain poplar, fir, pine and bamboo flakes, and obtaining poplar and fir flakes: length 50-70mm, width 15-25mm, thickness 0.6-0.8 mm; pine and bamboo chipping: length 80mm-120mm, width 20mm-30mm, thickness 0.3-0.5 mm;
feeding sorghum stalks into a pulverizer to be pulverized to obtain sorghum stalk powder;
after all the chips and the powder are produced, the chips and the powder are respectively transferred to a wet wood shaving bin.
(2) Drying of the flakes
And (3) starting a drying system for preheating, starting feeding when the drying inlet temperature is 260 ℃ and the outlet temperature is 120 ℃, conveying prepared chips and powder from a wet wood shaving bin to a dryer by a belt conveyor, setting the rotating speed of a drying cylinder at 2.5r/min during feeding, and setting the feeding amount of the wet wood shaving bin to be 17T/h. The outlet temperature cannot exceed 140 ℃ in the drying process, dried sliced sheets and crushed powder are obtained, and the water content of the dried sliced sheets and the dried crushed powder is 2.7%;
and after drying, the poplar and fir chips are sent into a sublayer shaving dry bin, the pine and bamboo chips are sent into a middle core layer shaving dry bin, and the crushed sorghum stalks are sent into a fine material surface layer dry bin for storage.
(3) Sizing
Feeding the subsurface wood shavings into a roller type subsurface wood shavings blender, and adding 3.0% of isocyanate, 2.0% of ethyl acetate, 2.5% of epoxy resin, 2.5% of talcum powder, 1.5% of hydrated alumina, 1.0% of paraffin emulsion and 0.7% of palm wax;
putting the middle core layer wood shavings into a roller type middle core layer wood shavings mixing machine, and adding isocyanate accounting for 4.0 percent of the mass of the middle core layer wood shavings, 2.5 percent of ethyl acetate, 2.5 percent of dibutyl phthalate, 2.0 percent of talcum powder, 2.0 percent of hydrated alumina, 0.5 percent of paraffin emulsion and 0.7 percent of palm wax;
feeding the fine material surface layer into a spiral stirring type glue mixer, and adding 3.0% of isocyanate, 2.5% of ethyl acetate, 2.0% of dibutyl phthalate, 2.5% of talcum powder, 1.5% of hydrated alumina, 0.7% of paraffin emulsion and 1.0% of palm wax;
spraying water to the wood shavings after glue mixing. The water content of the fine material surface layer wood shavings is 11%, the water content of the subsurface layer wood shavings is 5.0%, and the water content of the middle core layer wood shavings is 5.5%;
and conveying the glued wood shavings to each paving metering bin through a scraper conveyor and a belt conveyor for storage so as to prepare for paving.
(4) Paving, forming and prepressing
And conveying the glued wood shavings to a paving machine from a paving metering bin for paving, wherein the mass ratio of the paving wood shavings is 45% of the subsurface layer, 20% of the middle core layer and 35% of the fine material surface layer, the mass ratio of the subsurface layer poplar wood shavings to the cedar wood shavings is 1.2:1, and the mass ratio of the middle core layer pine wood shavings to the bamboo shavings is 2: 1.
The paving sequence is that the middle core layer is upward sequentially a last surface layer, an upper glass fiber layer and an upper fine material surface layer, and the middle core layer is downward sequentially a next surface layer, a lower glass fiber layer and a lower fine material surface layer. The cross section of the paved plate blank is uniform in thickness, the upper and lower fine material surface layers cover the upper and lower glass fiber layers and the upper and lower secondary surface layers, the middle core layer is two layers, paving is carried out twice in the same direction, the last time surface layer sliced piece faces one direction, the included angle between the last time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, the next time surface layer sliced piece faces one direction, the included angle between the next time surface layer sliced piece and the middle core layer sliced piece is 90 degrees, fine material surface layer powder is uniformly distributed, the plate blank moving speed is 220mm/s, and metal impurities in the paved plate blank are adsorbed, separated and removed by permanent magnets in the transportation process;
paving and forming, and then performing prepressing to obtain a plate blank;
the mesh size of the glass fiber layer is 0.5 x 0.5mm, and the thickness is 0.1 mm.
(5) Hot pressing
The paved and formed slab enters a continuous press through belt transportation, the frame temperature of the press is 240 ℃ in a first region, 230 ℃ in a second region, 230 ℃ in a third region, 220 ℃ in a fourth region, 200 ℃ in a fifth region, the hot pressing time (hot pressing factor 12 s/mm), the pressure of the first region is 2.4N/mm, the pressure of the second region is 1.4N/mm, the pressure of the third region is 1.2N/mm, the pressure of the fourth region is 0.9N/mm, and the pressure of the fifth region is 0.7N/mm;
the plate blank is subjected to a series of physical and chemical changes through high temperature and high pressure to obtain the formed plain plate.
(6) Post-treatment
And the hot-pressed formed plain plate is sent into a plate airing frame for cooling after being sawed longitudinally and transversely. And cutting the cooled plain board again by a center saw, sending the plain board into a sander for sanding, and then entering a stacking station for stacking after sanding to obtain a formed board, namely the veneer-faced oriented strand board, wherein the thickness of the veneer-faced oriented strand board is 18.47 mm.
The beneficial effects of this embodiment:
(1) the density of the low-density veneered oriented strand board prepared in this example was 0.47g/cm thin shoots;
(2) the static bending strength of the low-density veneered oriented strand board prepared by the embodiment is parallel to 35.2MPa and vertical to 19.7 MPa;
(3) the elastic modulus of the low-density veneered oriented strand board prepared by the embodiment is parallel to 4744MPa and perpendicular to 2912 MPa;
(4) the internal bonding strength of the low-density veneered oriented strand board prepared by the embodiment is 1.45 MPa;
(5) the surface bonding strength of the low-density veneerable oriented shaving board prepared by the embodiment is 1.41 MPa;
(6) the screw holding force 1592N for the low density veneered oriented strand board prepared in this example;
(7) the low-density veneerable oriented strand board prepared in the embodiment has a water absorption thickness expansion rate of 4.5% after 24 h.

Claims (6)

1. The low-density veneerable oriented strand board is characterized in that the low-density veneerable oriented strand board is of an eight-layer structure, a middle core layer is of two layers, the middle core layer is upward sequentially provided with a previous surface layer, an upper glass fiber layer and an upper fine material surface layer, and the middle core layer is downward sequentially provided with a next surface layer, a lower glass fiber layer and a lower fine material surface layer;
the glass fiber layer has a glass fiber mesh size of 0.5 x 0.5mm and a thickness of 0.1 mm;
the preparation method of the low-density veneered oriented strand board comprises the steps of slicing, slicing and drying, gluing, paving and forming, prepressing and hot pressing;
the adhesives and additives used for the surface layers of the sizing, the surface layer wood shavings, the middle core layer wood shavings and the fine materials comprise isocyanate, ethyl acetate, dibutyl phthalate, epoxy resin, talcum powder, hydrated alumina, paraffin emulsion and palm wax;
adding isocyanate accounting for 2.0-3.0% of the mass of the shaving wood chips on the subsurface layer, ethyl acetate accounting for 1.0-2.0%, epoxy resin accounting for 1.5-2.5%, talcum powder accounting for 1.5-2.5%, hydrated alumina accounting for 0.7-1.5%, paraffin emulsion accounting for 0.5-1.0% and palm wax accounting for 0.3-0.7% of the mass of the shaving wood chips on the subsurface layer;
adding 3.0-4.0% of isocyanate, 1.5-2.5% of ethyl acetate, 1.5-2.5% of dibutyl phthalate, 1.0-2.0% of talcum powder, 1.0-2.0% of hydrated alumina, 0.3-0.5% of paraffin emulsion and 0.3-0.7% of palm wax into the middle core layer wood shavings;
isocyanate accounting for 2.5-3.0% of the mass of the fine material surface layer, ethyl acetate accounting for 1.5-2.5%, dibutyl phthalate accounting for 1.0-2.0%, talcum powder accounting for 1.5-2.5%, hydrated alumina accounting for 0.7-1.5%, paraffin emulsion accounting for 0.3-0.7% and palm wax accounting for 0.5-1.0% of the mass of the fine material surface layer are added into the fine material surface layer.
2. A low density veneerable oriented strand board according to claim 1, wherein:
the middle core layer is made of pine wood chips and bamboo chips, the subsurface layer is made of poplar and cedar chips, and the fine material surface layer is made of sorghum stalk powder.
3. A low density veneerable oriented strand board according to claim 1, wherein:
two-layer flaking of well sandwich layer is towards same direction, and the top layer flaking of last time is towards a direction, is 90 with the contained angle of well sandwich layer flaking, and next time top layer flaking is towards a direction, is 90 with the contained angle of well sandwich layer flaking.
4. A low density veneerable oriented strand board according to claim 1, wherein:
the paving molding is carried out, wherein the mass ratio of the paving wood shavings to the subsurface layer is 45-55%, the mass ratio of the paving wood shavings to the core layer is 20-25%, and the mass ratio of the paving wood shavings to the fine material surface layer is 20-30%;
the mass ratio of poplar wood to cedar wood shavings in the subsurface layer is 0.5-1.2:1, and the mass ratio of pine wood to bamboo shavings in the middle core layer is 1-2: 1.
5. A low density veneerable oriented strand board according to claim 1, wherein:
the hot pressing, frame temperature of the press being 240 ℃ in the first zone 220, 230 ℃ in the second zone 200, 230 ℃ in the third zone 200, 220 ℃ in the fourth zone 190, 200 ℃ in the fifth zone 180, the hot pressing factor being 8-12s/mm, the first zone pressure being 2.0-2.4N/mm, the second zone pressure being 1.0-1.4N/mm, the third zone pressure being 0.8-1.2N/mm, the fourth zone pressure being 0.6-0.9N/mm, the fifth zone pressure being 0.4-0.7N/mm.
6. A low density veneerable oriented strand board according to claim 1, wherein:
the wood shavings are sliced by the materials to obtain poplar, fir, pine, bamboo shavings and sorghum stalk powder, wherein the poplar and fir shavings are as follows: length 50-70mm, width 15-25mm, thickness 0.6-0.8 mm; the pine and bamboo shavings: the length is 80mm-120mm, the width is 20mm-30mm, and the thickness is 0.3-0.5 mm.
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