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.