CN117484632A - Paving hot-pressing moisture-removing method for three-layer bamboo oriented strand board - Google Patents
Paving hot-pressing moisture-removing method for three-layer bamboo oriented strand board Download PDFInfo
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- CN117484632A CN117484632A CN202311631927.0A CN202311631927A CN117484632A CN 117484632 A CN117484632 A CN 117484632A CN 202311631927 A CN202311631927 A CN 202311631927A CN 117484632 A CN117484632 A CN 117484632A
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 103
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 103
- 241001330002 Bambuseae Species 0.000 title claims abstract description 103
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 103
- 239000011425 bamboo Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000007731 hot pressing Methods 0.000 title claims abstract description 40
- 239000002023 wood Substances 0.000 claims abstract description 32
- 239000002344 surface layer Substances 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 21
- 239000012792 core layer Substances 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 36
- 230000008569 process Effects 0.000 abstract description 16
- 239000003292 glue Substances 0.000 abstract description 6
- 238000005187 foaming Methods 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000003892 spreading Methods 0.000 abstract description 2
- 230000007480 spreading Effects 0.000 abstract description 2
- 102000010637 Aquaporins Human genes 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 238000004026 adhesive bonding Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- 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
- B27N3/14—Distributing or orienting the particles or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane 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
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a paving hot-pressing moisture-removing method of a bamboo oriented strand board, which comprises the following steps: s1, sorting bamboo shavings; s2, paving to form a plate blank; s3, carrying out compression roller fluffing on the bamboo shavings on the surface layer along the length direction to form filiform cracks, paving the filiform cracks on the surface layers on two sides of the slab, and covering a wood veneer on the surface layers; s4, hot pressing. According to the invention, the surface layer wood shavings are provided with the cracks and are covered with the single plate for compounding, so that the surface layer forms the channels, water vapor can be effectively discharged through the channels formed by the cracks under the assistance of an internal wood shavings arrangement mode and a hot pressing temperature control mode in the hot pressing process, and the problem of foaming and glue spreading of the plate blank caused by the explosion of the water vapor due to the pressure release of the plate blank is avoided.
Description
Cross Reference to Related Applications
The application is based on application number 2022113819241, and the application date is: the invention discloses a method for paving, hot-pressing and dehumidifying oriented strand boards of bamboo, which is a divisional application of China patent application, namely, 11-07-2022.
Technical Field
The invention relates to the technical field of bamboo processing, in particular to a paving, hot-pressing and moisture-removing method for oriented strand boards of bamboo.
Background
The oriented strand board is prepared by processing wood into wood shavings with specific forms and directionally paving, and because the wood shavings have larger structures, the bending resistance of wood chips is fully exerted, so that the manufactured board has good physical and mechanical properties and processability, and the oriented strand board gradually replaces multi-layer boards and jointer boards, so that the oriented strand board becomes a main material for building decoration materials.
Bamboo is the forestry resource with the most resource advantage in China, and in recent years, the country continuously advocates transformation and upgrading of the bamboo industry and promotes the building material development of the bamboo; at present, the prior art can prepare bamboo shavings with specific specifications to replace wood shavings, so that the bamboo oriented strand board is prepared, and the prepared bamboo shavings are sliced along the growth direction of the bamboo because the bamboo fibers are of a longitudinal structure, and the bamboo shavings are of a strip shape, so that the bending resistance of the fibers is fully utilized; in order to pursue high static bending and high elastic modulus, the density of the bamboo oriented strand board can reach over 900g/cm, the internal compactness of the board is high, and the compression ratio is large.
The process of the bamboo oriented strand board comprises the steps of flaking acquisition, drying, glue mixing, paving, prepressing, hot press forming, cooling forming, thickness fixing sanding, edge cutting and packaging, wherein hot press is a key process in the whole process, and mainly the problems of influence of hot press temperature, pressure and time on moisture content, uniformity, thermocurability and stability are mainly related, and if the process is not good, the problems of plate glue opening, poor gluing, plate frying, plate blank foaming and the like are caused; for example, the problem of exhausting the water vapor of the bamboo shavings during hot pressing, the problem of curing air clusters in a plate blank when the treatment is poor, and the problem of plate frying and poor gluing when the plate is opened is caused.
Specifically, due to the physiological characteristics of the bamboo fiber, the water in the fiber bundle tube is easy to dry and discharge, and the rest is the combined water in the bamboo fiber cells; in the wood shavings drying process, the water content of the dried bamboo shavings is 8+/-1%, when the drying is too low, the bamboo shavings are curled and transversely broken, paving and prepressing are caused, particularly the bamboo shavings curl, the bamboo shavings cannot be effectively lapped, plate blank gaps are easily formed, and the hot pressing quality is seriously affected; therefore, when hot pressing is carried out, along with continuous penetration and replacement of heat, water vapor in the wood shavings is gradually separated out, and because the bamboo shavings have high density, the water vapor cannot be laterally led out, more water vapor is gathered up and down to form clusters, and once the slab releases pressure, the water vapor can be exploded.
Disclosure of Invention
In order to solve at least one technical problem in the background art, the invention aims to provide a paving hot-pressing moisture-discharging method for a bamboo oriented strand board, which aims to solve the problems that the density of the bamboo oriented strand board is high, water vapor cannot be discharged due to the compactness of the board, and the paving density is uneven, so that the board is foamed, glued, and the board is uneven and bad in gluing.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a paving, hot-pressing and moisture-removing method for oriented strand boards of bamboo comprises the following steps:
s1, sorting bamboo shavings;
s2, paving to form a plate blank;
s3, carrying out compression roller fluffing on the bamboo shavings on the surface layer along the length direction to form filiform cracks, paving the filiform cracks on the surface layers on two sides of the slab, and covering a wood veneer on the surface layers;
s4, hot pressing.
Compared with the prior art, the invention has the beneficial effects that: by arranging the surface wood shavings to press cracks and covering the veneers for compounding, the surface forms channels, so that water vapor can be effectively discharged through the channels formed by the cracks under the assistance of an internal wood shavings arrangement mode and a hot pressing temperature control mode in the hot pressing process, and the problem of foaming and glue spreading of the plate blank caused by explosion of the water vapor due to plate blank pressure release is avoided.
Further, step S4 includes the following stages:
s41, a pre-pressing stage: the pressure is 0.5-1Mpa, and the stage maintaining time is 1-2min;
s42, pressurizing: the pressure is 4-5Mpa, the slab is close to the size of the thickness gauge, and the stage maintaining time is 2-3min;
s43, moisture removal stage: the pressure is 3-4Mpa, and the stage maintaining time is 5-6min;
s44, a pressure release stage: the pressure is reduced, the reducing speed in the first two minutes is 1Mpa/min, the reducing speed in the second two minutes is 0.5Mpa/min, the pressure is reduced to 0Mpa, and the stage maintaining time is 5-6min.
Further, in step S4, the hot pressing temperature is 140 ℃ to 160 ℃.
Further, in step S3, the depth of the crack of the press roll fluffing is 5% -10% of the thickness of the bamboo shavings, and the distance between adjacent cracks is 20% -30% of the width of the bamboo shavings.
Further, both sides of the bamboo shavings are subjected to compression roller fluffing.
In the step S1, the bamboo shavings are screened according to the length, wherein the screening size is 5-8cm, 8-12cm and 12-15cm.
Further, in step S2, the bamboo shavings with the length of 5-8cm are placed on the core layer of the slab, and the slab is paved with the bamboo shavings with the length of 8-12cm and the bamboo shavings with the length of 12-15cm from the core layer outwards in sequence.
In step S2, the bamboo shavings are laid in a layered and staggered orientation with alternating transverse and longitudinal directions.
Further, in step S2, the overlapping and overlapping distance of the bamboo shavings in the length direction is 1/4-1/3 of the length of the bamboo shavings, and the overlapping and overlapping distance in the width direction is 1/5-1/4 of the width of the bamboo shavings.
Drawings
FIG. 1 is a schematic illustration of a process flow of the present invention;
FIG. 2 is a schematic diagram of a stage flow in a hot pressing process according to the present invention;
fig. 3 is a graph showing the temperature profile of the core layer of the slab in the hot pressing process according to the present invention.
In the figure: 1. the direction of water vapor; 2. a water vapor form; 3. temperature field strength; A. an initial state; B. a pre-pressing stage; C. a pressurizing stage; D. a moisture removal stage; E. and a pressure release stage.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment provides a paving hot-pressing moisture-removing method for bamboo oriented strand boards.
The oriented strand board is prepared by processing wood into wood shavings with specific forms and directionally paving, and because the wood shavings have larger structures, the bending resistance of wood chips is fully exerted, so that the manufactured board has good physical and mechanical properties and processability, and the oriented strand board gradually replaces multi-layer boards and jointer boards, so that the oriented strand board becomes a main material for building decoration materials.
Bamboo is the forestry resource with the most resource advantage in China, and in recent years, the country continuously advocates transformation and upgrading of the bamboo industry and promotes the building material development of the bamboo; at present, the prior art can prepare bamboo shavings with specific specifications to replace wood shavings, so that the bamboo oriented strand board is prepared, and the prepared bamboo shavings are sliced along the growth direction of the bamboo because the bamboo fibers are of a longitudinal structure, and the bamboo shavings are of a strip shape, so that the bending resistance of the fibers is fully utilized; in order to pursue high static bending and high elastic modulus, the density of the bamboo oriented strand board can reach over 900g/cm, the internal compactness of the board is high, and the compression ratio is large.
The process of the bamboo oriented strand board comprises the steps of flaking acquisition, drying, glue mixing, paving, prepressing, hot press forming, cooling forming, thickness fixing sanding, edge cutting and packaging, wherein hot press is a key process in the whole process, and mainly the problems of influence of hot press temperature, pressure and time on moisture content, uniformity, thermocurability and stability are mainly related, and if the process is not good, the problems of plate glue opening, poor gluing, plate frying, plate blank foaming and the like are caused; for example, the problem of exhausting the water vapor of the bamboo shavings during hot pressing, the problem of curing air clusters in a plate blank when the treatment is poor, and the problem of plate frying and poor gluing when the plate is opened is caused.
Therefore, the invention aims to solve the problems that when the density of the oriented strand board made of bamboo is designed to be more than 900g/cm, the density of a plate blank is high, water vapor cannot be discharged due to compaction in the plate blank, and the problem that the plate blank is foamed, gummed, uneven and poor in bonding caused by uneven paving density and the like.
Specifically, the invention provides a paving method, wherein the bamboo oriented strand board is of a multi-layer 3-layer or 5-layer structure, the shape of bamboo shavings is 5-15cm in length, 0.8-3cm in width and 0.6-1.2mm in thickness; the method for obtaining the bamboo shavings is to cut the fixed length bamboo tube in the longitudinal direction, and adopts the technical mode of rotary cutting and thickness fixing, and the width of the bamboo shavings is the radial wall thickness and the chord direction layer thickness of the bamboo tube, so that the shavings with different widths are formed, but the distribution is relatively uniform; meanwhile, because the bamboo tubes are not bent uniformly and bamboo joints exist, the bamboo shavings can be in an unstable state during cutting, the obtained bamboo shavings change within a certain range, the length direction can be decomposed, and the uniformity of the thickness is relatively consistent.
The specific implementation is as follows: screening bamboo shavings with different lengths, sorting according to the lengths of 5-8cm, 8-12cm and 12-15cm, layering and paving according to different lengths, layering and staggered orientation of paved shavings, namely a transverse-longitudinal-transverse staggered structure, wherein an inner core layer is short shavings, and long shavings are paved on a surface layer, so that bending resistance and tensile property of bamboo can be well utilized; and the paved flaking of each layer is lapped to be 1/4-1/3 of the length in the paving direction, namely the length direction, and paved and lapped to be 1/5-1/4 of the width in the width direction.
The water in the fiber bundles is easy to dry and drain due to the physiological characteristics of the bamboo fiber, and the rest is the combined water in the bamboo fiber cells; in the wood shavings drying process, the water content of the dried bamboo shavings is 8+/-1%, when the drying is too low, the bamboo shavings are curled and transversely broken, paving and prepressing are caused, particularly the bamboo shavings curl, the bamboo shavings cannot be effectively lapped, plate blank gaps are easily formed, and the hot pressing quality is seriously affected; therefore, when hot pressing is carried out, along with continuous deep penetration and replacement of heat, water vapor in the wood shavings is gradually separated out, and because the bamboo shavings have high density, the water vapor cannot be transversely led out, more water vapor is gathered up and down to form clusters, and once the slab is released, the water vapor can be exploded, so that the slab is scrapped.
In order to avoid the problem of water vapor explosion, the invention provides a moisture removal method, which comprises the steps of firstly obtaining separated bamboo shavings according to the method, respectively selecting the bamboo shavings on the surface layer to be subjected to compression roller fluffing along the length direction, so that filiform cracks are formed on the surface of the bamboo shavings, paving the treated bamboo shavings on the surface layer of a plate blank, and respectively adding a wood veneer; the depth of cracks of the press roll fluffing is 5% -10% of the thickness of the bamboo shavings, and the adjacent cracks are 20% -30% of the width; the bamboo shavings are treated by two-sided fracturing.
Paving the bamboo shavings subjected to the fracturing treatment on the surface layer of the plate blank according to the method, paving a wood veneer, wherein the thickness of the veneer is 1.2-1.8mm; the processing can keep the bamboo surface shavings and the surface of the veneer to form a specific air cavity structure, and the water vapor can find an external exhaust channel along with the heating of the slab.
The slab is then hot pressed, and the hot pressing process includes 4 stages, including pre-pressing stage, pressurizing stage, moisture eliminating stage and pressure releasing stage at 140-160 deg.c.
The bamboo wood is different from the wood in that the whole material is hard, the heat transfer coefficient is low, and the bamboo wood needs to be heated longer than the wood to soften the wood, so that according to the high-strength performance index of the product, the hot-pressing time and the hot-pressing pressure are required to be kept, and the method specifically comprises the following steps:
the pre-pressing stage is 0.5-1Mpa, the cutting is to compress bamboo shavings, so that the curled or unevenly paved part in the plate blank is in a slow and flat state for 1-2min;
the pressurizing stage, namely, directly and rapidly increasing the pressure to 4-5Mpa to enable the slab to approach the size of the thickness gauge, wherein the stage is key for slab molding, and the heat conduction is enhanced while the slab is rapidly compressed, so that the heat conduction efficiency is improved, and the time is 2-3min;
in the moisture removal stage, as the temperature of the plate blank gradually reaches the design temperature and the bamboo is gradually plastically softened, the volume of the plate blank gradually reduces, when the thickness gauge is reached, the plate blank is in a stable heated and pressed state, the pressure is controlled to be 3-4Mpa, when the plate blank is completely within the thickness gauge range, the heat field of the plate blank is consistent, the moisture is completely vaporized after being heated, the steam at the boundary of the plate blank is directly discharged, the internal steam moves transversely or up and down, and when the plate blank moves to the surface layer, the steam is discharged through an air cavity for 5-6min;
and in the pressure release stage, after the plate blank is subjected to hot pressing, certain volume rebound occurs along with pressure release, meanwhile, as part of water vapor of the plate blank can be discharged, the pressure is reduced in the pressure release stage in a step shape, 1Mpa/min is reduced every first 2 minutes, 0.5Mpa/min is reduced in the last 2 minutes until the pressure is reduced to 0Mpa, and the time is 5-6 minutes.
The change of the water vapor direction 1, the water vapor form 2, the temperature field intensity 3 and the change flow of the hot press molding of the plate blank are marked in fig. 2.
In the hot pressing process, the air pressure of the surface layer rises firstly at the beginning, and is larger than that of the core layer at the beginning, and then the air pressure of the core layer rises sharply to exceed the surface layer; the time for the temperature of the core layer to reach 100 ℃ is almost equal to the time of the balancing period before the pressure of the core layer starts to rise; the higher the density of the plate is, the more stable the air pressure is, the higher the highest air pressure value of the surface core layer is, and the more the appearance time is pushed; the water content of the slab is high, and the duration time of the short balancing section is slightly short; in the rapid pressure increasing section, the plate blank with high water content has high pressure increasing speed, and the highest core layer pressure value is large; the higher the pressure of the high-density core layer is, the higher the vaporization temperature is; in the depressurization stage, the core layer pressure is always larger than the surface layer pressure, and the slab pressure with high water content is always larger than the slab with low water content.
The central vapor pressure of the slab is divided into three sections: the partial pressure of the water vapor and the air is increased, and the total pressure is gradually increased; the partial pressure of the water vapor is increased to be stable, the partial pressure of the air is reduced, and the total pressure is firstly increased to a peak value and then slowly reduced; the partial pressure of both water vapor and air decreases slowly and the total pressure decreases slowly.
Example 1
Adopting the paving method, wherein the bamboo oriented strand board is of a three-layer structure, wood shavings with the length of 5-8cm are placed in the core layer, and the other two are separately placed in the surface layer; adopting the moisture removing method to carry out treatment; carrying out hot pressing by adopting the hot pressing method; details are shown in Table 1.
Example 2
Adopting the paving method, wherein the bamboo oriented strand board has a five-layer structure, and comprises 1-5 layers from bottom to top, wherein the wood shavings with the length of 5-8cm are arranged on the core layer, namely the 3 rd layer, the wood shavings with the length of 8-12cm are arranged on the 2 nd layer and the 4 th layer, and the wood shavings with the length of 12-15cm are arranged on the surface layer, namely the 1 st layer and the 5 th layer; adopting the moisture removing method to carry out treatment; carrying out hot pressing by adopting the hot pressing method; details are shown in Table 1.
Table 1 results data for example 1 and example 2
The details of the temperature of the slab core layer in the hot pressing process are shown in fig. 3, and temperature change curves in an initial state A, a pre-pressing stage B, a moisture removal stage C and a pressure release stage D are marked.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. The hot-pressing and moisture-removing method for paving the three-layer bamboo oriented strand boards is characterized by comprising the following steps of:
s1, sorting bamboo shavings; the bamboo shavings are screened according to the length, and the screening size is 5-8cm, 8-12cm and 12-15cm;
s2, paving to form a plate blank; placing 5-8cm long shavings on the core layer, and placing 8-12cm long shavings and 12-15cm long shavings on the surface layer respectively;
s3, carrying out compression roller fluffing on the bamboo shavings on the surface layer along the length direction to form filiform cracks, paving the filiform cracks on the surface layers on two sides of the slab, and covering a wood veneer on the surface layers;
s4, hot pressing, wherein the temperature of the hot pressing is 140-160 ℃;
step S4 comprises the following phases:
s41, a pre-pressing stage: the pressure is 1Mpa, and the stage maintaining time is 1-2min;
s42, pressurizing: the pressure is 5Mpa, so that the slab approaches the size of the thickness gauge, and the stage maintaining time is 2-3min;
s43, moisture removal stage: the pressure is 4Mpa, and the stage maintaining time is 5-6min;
s44, a pressure release stage: the pressure was reduced at a rate of 1MPa/min in the first two minutes and at a rate of 0.5MPa/min in the second two minutes until it was reduced to 0MPa, with a period of 6 minutes.
2. The method for hot pressing and moisture removal of a three-layer oriented strand board according to claim 1, wherein in the step S3, the depth of cracks of the press roll fluffing is 5% -10% of the thickness of the bamboo shavings, and the distance between adjacent cracks is 20% -30% of the width of the bamboo shavings.
3. The method for hot pressing and moisture removing of a pavement of three-layer oriented strand board made of bamboo according to claim 2, wherein both sides of the bamboo shavings are subjected to compression roller fluffing.
4. The method for hot pressing and moisture removal of a mat of three-layer oriented strand board according to claim 1, wherein in step S2, the strands of bamboo are laid in alternating horizontal and vertical layered staggered orientations.
5. The method for hot pressing and moisture removing of the pavement of the three-layer bamboo oriented strand board according to claim 4, wherein in the step S2, the overlapping and overlapping distance of the bamboo shavings in the length direction is 1/4-1/3 of the length of the bamboo shavings, and the overlapping and overlapping distance in the width direction is 1/5-1/4 of the width of the bamboo shavings.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631927.0A CN117484632A (en) | 2022-11-07 | 2022-11-07 | Paving hot-pressing moisture-removing method for three-layer bamboo oriented strand board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311631927.0A CN117484632A (en) | 2022-11-07 | 2022-11-07 | Paving hot-pressing moisture-removing method for three-layer bamboo oriented strand board |
| CN202211381924.1A CN115648378B (en) | 2022-11-07 | 2022-11-07 | Paving, hot-pressing and moisture-removing method for oriented strand boards made of bamboo |
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| CN202211381924.1A Division CN115648378B (en) | 2022-11-07 | 2022-11-07 | Paving, hot-pressing and moisture-removing method for oriented strand boards made of bamboo |
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| CN202311631927.0A Pending CN117484632A (en) | 2022-11-07 | 2022-11-07 | Paving hot-pressing moisture-removing method for three-layer bamboo oriented strand board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2508628B2 (en) * | 1975-02-27 | 1977-05-26 | Mang, Josef, 8941 Holzgünz | FLOOR ELEMENT |
| DE4208263A1 (en) * | 1992-03-14 | 1993-09-16 | Siempelkamp Gmbh & Co | Continuous band press for chipboard - has direct steam/vacuum supply to material through wire mesh band held on process bars supplied through sliding joints at end of process bars |
| JP2774068B2 (en) * | 1994-08-19 | 1998-07-09 | 光洋産業株式会社 | Hot-press forming method of aggregate |
| CN101298157B (en) * | 2008-06-03 | 2011-08-17 | 中国林业科学研究院木材工业研究所 | High-hardness plate and manufacturing method thereof |
| CN101927519A (en) * | 2010-07-09 | 2010-12-29 | 南京汉青竹业有限公司 | Hot forming method for high-strength complex material particle board |
| CN202572539U (en) * | 2012-04-01 | 2012-12-05 | 诸暨市光裕竹业有限公司 | Structural composite board taking broken bamboo as raw material |
| CN102886808A (en) * | 2012-11-06 | 2013-01-23 | 江苏快乐木业集团有限公司 | Oriented shaving board and preparation method thereof |
| CN112677272B (en) * | 2020-12-05 | 2022-09-06 | 江西安竹科技有限公司 | Bamboo fiber fluffing device and fluffing process |
| CN215881943U (en) * | 2021-09-01 | 2022-02-22 | 江苏慧典新材有限公司 | Bamboo veneer oriented strand board |
| CN113681657A (en) * | 2021-09-01 | 2021-11-23 | 江苏慧典新材有限公司 | Bamboo veneer oriented strand board and preparation process thereof |
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2022
- 2022-11-07 CN CN202211381924.1A patent/CN115648378B/en active Active
- 2022-11-07 CN CN202311631927.0A patent/CN117484632A/en active Pending
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| CN115648378B (en) | 2023-12-22 |
| CN115648378A (en) | 2023-01-31 |
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