CN111300575A - Processing method of compressed reinforced fast growing wood - Google Patents
Processing method of compressed reinforced fast growing wood Download PDFInfo
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- CN111300575A CN111300575A CN202010182257.9A CN202010182257A CN111300575A CN 111300575 A CN111300575 A CN 111300575A CN 202010182257 A CN202010182257 A CN 202010182257A CN 111300575 A CN111300575 A CN 111300575A
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- test piece
- pressing
- fast
- fast growing
- pressing plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/06—Softening or hardening of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
Abstract
The invention discloses a processing method of a compressed reinforced fast growing wood, which comprises the following steps: s1, softening the pretreated fast growing wood test piece; s2, placing the fast growing wood test piece in a hot-pressing mold for hot-pressing and shaping treatment, and obtaining a compressed reinforced fast growing wood after pressure relief and cooling; the hot pressing die comprises two pressing plates which are symmetrically arranged, the fast growing material test piece is positioned between the two pressing plates, the upper surface and the lower surface of the fast growing material test piece are in direct contact with the two pressing plates respectively, a plurality of release holes are formed in one surface, close to the fast growing material test piece, of each pressing plate, the other end, away from one side direction of the fast growing material test piece, of each release hole is communicated with a groove, and water on the surface of the fast growing material test piece is discharged to the groove through the release holes. The invention has simple operation and can quickly release the water of the compressed wood.
Description
Technical Field
The invention relates to the field of furniture, in particular to a processing method of a compressed reinforced fast growing wood.
Background
Compression densification is a very common strengthening method when strengthening fast growing wood. The method is characterized in that softening treatment is required before compression, the most environment-friendly and common physical softening method is hydrothermal treatment or steam, the elastic modulus of the treated material is greatly reduced, the plasticity is increased, the densification of the wood is realized under the pressurization condition, but the moisture in the wood cannot be discharged, the wood has the defects of springback or bubbling and the like under the action of residual stress after pressure relief, the moisture content in the treated wood is high, and the use of a final product is influenced. The rebound rate after compression can be reduced by prolonging the hot pressing time or carbonization treatment, but the process treatment time is long, the production efficiency is low, and the production cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a processing method of compressed reinforced fast growing wood, which is simple to operate and can quickly release the moisture of the compressed wood.
In order to solve the technical problems, the invention adopts the following technical scheme:
a processing method of a compressed reinforced fast growing wood comprises the following steps
S1, softening the pretreated fast growing wood test piece;
s2, placing the fast growing wood test piece in a hot-pressing mold for hot-pressing and shaping treatment, and obtaining a compressed reinforced fast growing wood after pressure relief and cooling;
the hot pressing die comprises two pressing plates which are symmetrically arranged, the fast growing material test piece is positioned between the two pressing plates, the upper surface and the lower surface of the fast growing material test piece are in direct contact with the two pressing plates respectively, a plurality of release holes are formed in one surface, close to the fast growing material test piece, of each pressing plate, the other end, away from one side direction of the fast growing material test piece, of each release hole is communicated with a groove, and water on the surface of the fast growing material test piece is discharged to the groove through the release holes.
As a further improvement of the above technical solution:
the pressure plate comprises an inner pressure plate and an outer pressure plate, the inner pressure plate is positioned between the fast growing wood test piece and the outer pressure plate, the release holes are positioned on the inner pressure plate and run through the upper surface and the lower surface of the inner pressure plate, and the grooves are positioned on the outer pressure plate and are communicated with the release holes.
The release holes are arranged on one surface of the pressing plate at intervals in a longitudinal and transverse mode and are close to one side of the fast growing wood test piece, and the grooves are arranged on the other surface of the pressing plate at intervals in a longitudinal and transverse mode and are far away from one side of the fast growing wood test piece.
The hot-pressing die further comprises a thickness gauge, and the thickness gauge is located between the two pressing plates and is close to the end portions of the two pressing plates.
The thickness of the thickness gauge in the pressure direction is D, the thickness of the fast growing material test piece in the pressure direction is D, and D is 1.4-2D.
The temperature is 160-190 ℃, the pressure is 0.5-3.0MPa, and the time is 10min-2h when the hot pressing and setting treatment is performed in the step S2.
And during the hot-pressing setting treatment, the pressure rising time is 60-500 s, and the pressure relief time is 60-500 s.
The medium for softening treatment is water at 80-100 deg.C for 10-30 min.
The pretreatment is to carry out end-capping treatment on the side wall of the fast-growing wood test piece; the end-capping medium is polypropylene wax.
The groove width of the groove is s, the aperture of the release hole is r, and s is larger than r.
Compared with the prior art, the invention has the advantages that:
the invention carries out surface compression on the fast growing wood aiming at the furniture material, the hot pressing die is adopted during hot pressing and shaping, the pressure plate is provided with the release holes and the grooves, the moisture on the surface of the fast growing wood is discharged to the grooves through the release holes during hot pressing and shaping, the discharge of the moisture on the surface of the wood during hot pressing can be promoted, the hot pressing and shaping of the wood are accelerated, the hot pressing efficiency is improved, the surface compression quality of the wood is improved, the rebound rate of the compressed wood is reduced by more than 25%, the drying and shaping of the wood are accelerated, and the process time is shortened.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention.
Fig. 2 is a schematic structural view of a hot press mold in embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of the hot press mold according to embodiment 1 of the present invention (with one of the press plates removed).
Fig. 4 is a side view of the hot press mold in example 1 of the present invention.
Fig. 5 is a schematic structural view of an outer platen in embodiment 1 of the present invention.
Fig. 6 is a schematic structural view of an inner platen in embodiment 1 of the present invention.
Fig. 7 is a schematic structural view of a hot press mold in embodiment 2 of the present invention.
Fig. 8 is a schematic structural view of a hot press mold according to embodiment 2 of the present invention (with one of the press plates removed).
Fig. 9 is a side view of the hot press mold in embodiment 2 of the present invention.
The reference numerals in the figures denote:
1. pressing a plate; 11. an inner pressure plate; 111. a release aperture; 12. an outer pressing plate; 121. a groove; 2. and (4) a thickness gauge.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples. Unless otherwise specified, the instruments or materials employed in the present invention are commercially available.
Example 1:
as shown in fig. 1, the processing method of the compressed reinforced fast growing wood of the embodiment includes the following steps:
s1: end capping: drying and sawing the fast growing wood test piece after water content balance treatment, and sealing the periphery (referring to the side wall and two ends of the fast growing wood test piece, the upper surface and the lower surface are not sealed and used for exhausting steam) of the fast growing wood test piece by using polypropylene wax; in the embodiment, the fast growing wood is poplar, the water content of the fast growing wood before the end sealing is 12% -14%, the end sealing is beneficial to reducing the water content of the fast growing wood, and the hot pressing time is reduced.
S2: boiling in water for softening: boiling fast growing wood test piece with 100 deg.C water for 20 min; the surface is softened by adopting boiling water, so that the softening time is shortened, and the softening efficiency is improved.
In other embodiments, the end-capping step may not be performed, and the dry material or the wet material may be directly softened by water boiling, but the time for hot press forming is increased compared to the embodiment in the subsequent hot press forming.
In other embodiments, the medium for softening treatment is water with a temperature of 80-100 ℃ for 10-30min, and the same or similar technical effects can be obtained.
S3: hot pressing: placing the softened fast growing wood test piece in a hot-pressing die, placing the fast growing wood test piece on a hot press, setting the compression ratio of the wood (controlled by a thickness gauge) to be 50%, and setting the parameters of the press: the hot pressing temperature is 170 ℃, the pressure of the press is 3.0MPa, the pressure is increased for 60s, and the hot pressing is carried out for 30 min.
S4: shaping: and continuously keeping the hot pressing temperature, keeping the pressure, shaping for 2 hours (the total time of hot pressing and shaping is 2 hours), and cooling to room temperature after pressure relief (the pressure relief time is 60 seconds) to obtain the compressed reinforced fast growing wood.
In other embodiments, the temperature is 160-.
In step S3, the ordinary press plate of the laboratory press is a 500 × 500 × 2mm steel plate, the surface is flat and smooth, and only the heat transfer function and the smooth and flat wood surface guarantee are performed during hot pressing.
As shown in fig. 2 to 6, the hot pressing mold is composed of two symmetrically arranged pressing plates 1, the fast growing material test piece is located between the two pressing plates 1, the upper surface and the lower surface of the fast growing material test piece are respectively in direct contact with the two pressing plates 1, a plurality of release holes 111 are formed in one surface of each pressing plate 1, which is close to the fast growing material test piece, one end of each release hole 111, which is far away from the fast growing material test piece, is communicated with a groove 121, and moisture on the surface of the fast growing material test piece is discharged to the groove 121 through the release holes 111.
In this embodiment, the pressing plate 1 includes an inner pressing plate 1 and an outer pressing plate 12, the inner pressing plate 11 is located between the fast growing material test piece and the outer pressing plate 12, the release hole 111 is located on the inner pressing plate 11 and runs through the upper and lower surfaces of the inner pressing plate 11, and the groove 121 is located on the outer pressing plate 12 and is communicated with the release hole 111.
In this embodiment, the inner pressing plate 1 is a 1mm thick steel plate which is fully provided with the release holes 111 arranged at the longitudinal and transverse intervals, the outer pressing plate 12 is a 4mm thick steel plate which is fully provided with the criss-cross grooves 121, and the two steel plates are combined for use, so that the function of a common pressing plate is achieved, the moisture on the surface of the wood can be promoted to be discharged in the hot pressing process to accelerate the hot pressing and shaping of the wood, and the compression quality of the wood is improved.
In the present embodiment, the size of the outer platen 12: breadth: 500 × 500 × 4mm (length × width × thickness), groove 121: 500 × 1.5 × 2mm (length × width × depth), and adjacent grooves 121 are spaced 5mm apart. The groove 121 has a V-shaped cross section with an opening facing the release hole 111, and the groove 121 extends from one end of the outer pressing plate 12 to the opposite end and penetrates the entire surface of the outer pressing plate 12. In other embodiments, the cross section of the groove 121 may be rectangular, trapezoidal, or other patterns, and the same or similar technical effects may be obtained.
Size of the inner pressing plate 11: breadth: 500X 4mm (length X width X thickness), diameter of the release hole 111 is 1mm, and interval is 5 mm.
In the embodiment, the inner pressing plate 11 and the outer pressing plate 12 are both made of 304 stainless steel, grooves 121 with the width of 1.5mm are milled on the outer pressing plate 12 by using a milling cutter, the interval of each groove 121 is 5mm, and the surfaces of the grooves are fully distributed in a grid shape; the inner platen 11 is perforated with laser light to penetrate the plate surface.
When in use: 1. the two groups of pressing plates 1 are symmetrically arranged, so that the moisture on the upper surface and the lower surface of the fast growing wood test piece can be effectively discharged;
2. the position of the release hole 111 of the inner pressure plate 11 needs to be aligned and communicated with the position of the groove 121, so that the water vapor released from the release hole 111 can enter the groove 121 and be further released.
In the present embodiment, the thickness of the thickness gauge 2 in the pressure direction is D, the thickness of the fast growing material specimen in the pressure direction is D, and D is 2D, and in other embodiments, the size of the thickness gauge 2 is determined according to the compression ratio of the fast growing material specimen.
Example 2:
this embodiment is substantially the same as embodiment 1 except that the platen 1:
unlike the embodiment 1 in which the pressing plate 1 is composed of the inner pressing plate 11 and the outer pressing plate 12 and is a composite plate, the pressing plate 1 of the embodiment is a single plate as shown in fig. 7 to 9, and the arrow in fig. 8 indicates the pressing direction.
The release hole 111 is opened on one side of the pressing plate 1 and is arranged close to one side of the fast growing material test piece, and the groove 121 is opened on the other side of the pressing plate 1 and is arranged far away from one side of the fast growing material test piece.
The pressing plates 1 are all made of 304 stainless steel materials, grooves 121 with the width of 1.5mm are milled on one surface of the pressing plate 1 by a milling cutter, the interval of each groove 121 is 5mm, and the surfaces of the grooves are fully distributed in a grid shape; release holes 111 having a diameter of 1mm were laser-drilled in the grooves 121 with a space of 5mm between the release holes 111.
Comparative example 1:
the materials and methods used in this comparative example 1 were substantially the same as in example 1, except that: this comparative example did not use the hot press mold of example 1 in hot pressing and setting.
The compression-reinforced fast growing wood obtained in example 1, the fast growing wood product and the material (fast growing wood test piece raw material) obtained in comparative example 1 were subjected to mechanical testing, and the obtained results are shown in table 1, and it can be seen from table 1 that:
(1) the processing method of the invention obviously improves various properties of the wood, wherein the bending strength is improved by 1 time compared with the material, the elastic modulus is improved by 1.2 times compared with the material, and the surface hardness is improved by 2.1 times compared with the material.
(2) The final water content of the compression-enhanced fast-growing wood obtained in the example 1 is obviously lower than that of the comparative example 1, the promotion effect of the pressing plate 1 on the surface water discharge of the fast-growing wood test piece is proved, and in addition, the dimensional stability of the fast-growing wood test piece is improved by nearly 32%.
(3) The mechanical properties of the compression reinforced fast growing wood obtained in the example 1 are slightly better than those of the comparative example 1, the bending strength is improved by 11.04%, and the elastic modulus and the surface hardness have no obvious difference.
It can be seen that the press plate 1 of the present invention provides a certain improvement in the performance of the compressed reinforced fast growing wood obtained by the present method.
TABLE 1 results of mechanical Properties test of the product of comparative example 1, the product of example 1 and the Material
Note: both the flexural strength and the elastic modulus are values converted to 12% water content.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A processing method of a compressed reinforced fast growing wood is characterized in that: comprises the following steps
S1, softening the pretreated fast growing wood test piece;
s2, placing the fast growing wood test piece in a hot-pressing mold for hot-pressing and shaping treatment, and obtaining a compressed reinforced fast growing wood after pressure relief and cooling;
the hot pressing die comprises two pressing plates (1) which are symmetrically arranged, the fast-growing material test piece is positioned between the two pressing plates (1), the upper surface and the lower surface of the fast-growing material test piece are in direct contact with the two pressing plates (1) respectively, a plurality of release holes (111) are formed in one surface, close to the fast-growing material test piece, of each pressing plate (1), one ends, far away from the fast-growing material test piece, of the release holes (111) are communicated with grooves (121), and moisture on the surface of the fast-growing material test piece is discharged to the grooves (121) through the release holes (111).
2. The processing method according to claim 1, characterized in that: the pressing plate (1) comprises an inner pressing plate (11) and an outer pressing plate (12), the inner pressing plate (11) is located between the fast growing wood test piece and the outer pressing plate (12), the release holes (111) are located in the inner pressing plate (11) and penetrate through the upper surface and the lower surface of the inner pressing plate (11), and the grooves (121) are located in the outer pressing plate (12) and are communicated with the release holes (111).
3. The processing method according to claim 1, characterized in that: the release holes (111) are arranged on one surface of the pressing plate (1) at intervals in a longitudinal and transverse mode and are close to one side of the fast growing wood test piece, and the grooves (121) are arranged on the other surface of the pressing plate (1) at intervals in a longitudinal and transverse mode and are far away from one side of the fast growing wood test piece.
4. The processing method according to claim 1, characterized in that: the hot-pressing die further comprises a thickness gauge (2), wherein the thickness gauge (2) is located between the two pressing plates (1) and is close to the end portions of the two pressing plates (1).
5. The processing method according to claim 4, characterized in that: the thickness of the thickness gauge (2) in the pressure direction is D, the thickness of the fast-growing material test piece in the pressure direction is D, and D is 1.4-2D.
6. The processing method according to any one of claims 1 to 5, wherein: the temperature is 160-190 ℃, the pressure is 0.5-3.0MPa, and the time is 10min-2h when the hot pressing and setting treatment is performed in the step S2.
7. The process of claim 6, wherein: and during the hot-pressing setting treatment, the pressure rising time is 60-500 s, and the pressure relief time is 60-500 s.
8. The processing method according to any one of claims 1 to 5, wherein: the medium for softening treatment is water at 80-100 deg.C for 10-30 min.
9. The processing method according to any one of claims 1 to 5, wherein: the pretreatment is to carry out end-capping treatment on the fast-growing wood test piece; the end-capping medium is polypropylene wax.
10. The processing method according to any one of claims 1 to 5, wherein: the groove width of the groove (121) is s, the aperture of the release hole (111) is r, and s is larger than r.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182257.9A CN111300575A (en) | 2020-03-16 | 2020-03-16 | Processing method of compressed reinforced fast growing wood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182257.9A CN111300575A (en) | 2020-03-16 | 2020-03-16 | Processing method of compressed reinforced fast growing wood |
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| CN111300575A true CN111300575A (en) | 2020-06-19 |
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| CN202010182257.9A Pending CN111300575A (en) | 2020-03-16 | 2020-03-16 | Processing method of compressed reinforced fast growing wood |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114311201A (en) * | 2021-12-30 | 2022-04-12 | 东莞市新崚晟机械有限公司 | High-frequency hot-pressing drying method for wood |
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| JPS5218882U (en) * | 1975-07-28 | 1977-02-10 | ||
| CN1220204A (en) * | 1997-12-19 | 1999-06-23 | 费恺 | Mould forming wooden product processing method |
| CN101380762A (en) * | 2008-10-14 | 2009-03-11 | 潍坊凤凰纸业有限公司 | Heat press plate for hot press |
| CN101407076A (en) * | 2007-10-09 | 2009-04-15 | 浙江山脉液压机有限公司 | High-density bamboo beaverboard |
| CN101633188A (en) * | 2008-07-21 | 2010-01-27 | 阎建华 | Method for manufacturing fast-growing material through modification process |
| CN201389898Y (en) * | 2009-03-16 | 2010-01-27 | 镇江中福马机械有限公司 | Thickness gage structure used for multilayer thermal press |
| CN102626941A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Fast-growing wood surface reinforcing manufacturing method and sections manufactured thereby |
| CN106426499A (en) * | 2016-11-04 | 2017-02-22 | 镇江中福马机械有限公司 | Exhaust frame of density plate pre-pressing machine |
-
2020
- 2020-03-16 CN CN202010182257.9A patent/CN111300575A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5218882U (en) * | 1975-07-28 | 1977-02-10 | ||
| CN1220204A (en) * | 1997-12-19 | 1999-06-23 | 费恺 | Mould forming wooden product processing method |
| CN101407076A (en) * | 2007-10-09 | 2009-04-15 | 浙江山脉液压机有限公司 | High-density bamboo beaverboard |
| CN101633188A (en) * | 2008-07-21 | 2010-01-27 | 阎建华 | Method for manufacturing fast-growing material through modification process |
| CN101380762A (en) * | 2008-10-14 | 2009-03-11 | 潍坊凤凰纸业有限公司 | Heat press plate for hot press |
| CN201389898Y (en) * | 2009-03-16 | 2010-01-27 | 镇江中福马机械有限公司 | Thickness gage structure used for multilayer thermal press |
| CN102626941A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Fast-growing wood surface reinforcing manufacturing method and sections manufactured thereby |
| CN106426499A (en) * | 2016-11-04 | 2017-02-22 | 镇江中福马机械有限公司 | Exhaust frame of density plate pre-pressing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114311201A (en) * | 2021-12-30 | 2022-04-12 | 东莞市新崚晟机械有限公司 | High-frequency hot-pressing drying method for wood |
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Application publication date: 20200619 |