CN111805624A - Production process of small-diameter wood integrated material - Google Patents
Production process of small-diameter wood integrated material Download PDFInfo
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- CN111805624A CN111805624A CN202010726028.9A CN202010726028A CN111805624A CN 111805624 A CN111805624 A CN 111805624A CN 202010726028 A CN202010726028 A CN 202010726028A CN 111805624 A CN111805624 A CN 111805624A
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- drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B13/00—Band or strap sawing machines; Components or equipment therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
- B27C1/00—Machines for producing flat surfaces, e.g. by rotary cutters; Equipment therefor
- B27C1/08—Machines for working several sides of work simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention belongs to the technical field of laminated wood, and particularly relates to a production process of small-diameter wood laminated wood, which comprises the following steps: (1) selecting materials; (2) sawing a frame; (3) drying, the drying process comprising: a. building a material pile, b, preheating at low temperature, c, pretreating for the first time, d, performing intermediate treatment, e, pretreating for the second time, f, pretreating for the third time, and g, performing final treatment; (4) planing the side surface; (5) a jigsaw. The production process of the invention reduces the processes of multi-blade sawing, marking optimization, finger joint and the like, has simple operation steps, adopts intermittent drying in the drying process, can avoid end crack, surface crack, internal crack and deformation of sawn timber in the drying process, ensures the drying quality, shortens the drying time, reduces the drying cost, has high outturn percentage, is not easy to generate cracks on the timber, greatly saves labor, has small glue application amount in the use process and reduces pollution.
Description
Technical Field
The invention belongs to the technical field of laminated wood, and particularly relates to a production process of small-diameter wood laminated wood.
Background
The small-diameter wood refers to log with a small diameter grade, mainly comes from intermediate cutting operation during the tending period of the artificial forest and is a natural resource with low price. The small-diameter wood in China has high yield, but low utilization efficiency and poor economic benefit, and is mainly used as raw materials for producing non-structural plates and papermaking, even directly used as fuel.
With the rapid development of the wood processing technology in China in recent years, a large amount of forestry resources are consumed, natural forest resources are deficient, large-diameter-grade high-quality wood is in short supply, and small-diameter wood occupies a higher proportion in the whole wood yield and becomes an important source of wood supply.
At present, the production process of the small-diameter wood integrated material is complex, the outturn rate is low, and the production cost is high.
Disclosure of Invention
The invention aims to provide a production process of a small-diameter wood integrated material, which has the advantages of simple process, high material yield and low production cost, and aims to solve the problems in the background technology.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the raw wood into sawn timber by using a frame saw;
(3) and (3) drying: and conveying the sawn timber into a drying kiln for drying, wherein the drying process comprises the following steps:
a. building a material pile: building by adopting a filler strip stacking method, and pressing a heavy object on the top of the material stack;
b. low-temperature preheating: drying the above materials at 60-65 deg.C for 15-20 hr;
c. first pretreatment: raising the temperature to 70-75 ℃, and continuously drying for 10-12h to ensure that the water content of the sawn timber reaches 30-50%;
d. intermediate treatment: raising the temperature to 90-95 ℃, and continuously drying for 12-15h to make the water content of the sawn timber reach 25-30%;
e. and (3) second pretreatment: reducing the temperature to 70-75 ℃, and continuously drying for 8-12h to enable the water content of the sawn timber to reach 20-25%;
f. and (3) third pretreatment: heating to 80-90 deg.C, and continuously drying for 12-15 hr to make the water content of sawn timber reach 15-20%;
g. and (3) final treatment: heating to 95-100 deg.C, and continuously drying for 6-8 hr to make the water content of sawn timber reach 9-11%;
(4) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(5) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
As an improvement, the temperature rise rate in the low-temperature preheating is controlled to be 2-3 ℃/h. The temperature rise rate is controlled so that the temperature rise cannot be too fast, and the cracking phenomenon of sawn timber can be reduced or avoided.
As an improvement, the dried sawn timber is placed for 2 to 3 days at the temperature of between 14 and 16 ℃ and the relative humidity of between 50 and 55 percent, and then the side surface is peeled and sanded. The dried sawn timber is balanced for a period of time at the temperature of 14-16 ℃ and the relative humidity of 50-55 percent, so that the residual stress in the sawn timber can be further eliminated, and the water content is uniform.
As an improvement, the thickness of the sawn timber is 12-24 mm.
As a further improvement, when the material pile is built, the interval between two adjacent sawn materials is 60-75% of the width of the sawn materials, and the distance between two adjacent filler strips is 50-60 cm.
As a further improvement, the thickness of the cushion strip is 30 mm. The thickness of the spacer is preferably greater than the thickness of the sawn timber, so as to provide better support for the sawn timber.
As a modification, the length of the sawn timber is 2500 mm.
As a refinement, the transverse distance between the stacks is 10-30 cm.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the production process of the small-diameter wood integrated material provided by the invention reduces the processes of multi-blade sawing, scar and knot removal and the like, is simple in operation steps, adopts intermittent drying in the drying process, can avoid end cracking, surface cracking, internal cracking and deformation of the sawn wood in the drying process, ensures the drying quality, shortens the drying time, reduces the drying cost, is high in outturn rate, is not easy to generate cracks in the wood, greatly saves labor, is small in glue application amount in the use process, and reduces pollution.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 20mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material pile by using a filler strip stacking method, wherein when the material pile is built, the interval between two adjacent sawn materials is 60% of the width of the sawn materials, the distance between two adjacent filler strips is 50cm, the transverse distance between the material piles is 10cm, the material piles in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material piles, a heavy object is pressed on the top of each material pile, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the sawn timber pile at 60 ℃ for 20h, and controlling the heating rate at 2 ℃/h during low-temperature preheating to enable the water content of the sawn timber to reach 30-50%;
c. first pretreatment: raising the temperature to 70 ℃, and continuing to dry for 12 hours to enable the water content of the sawn timber to reach 25-30%;
d. intermediate treatment: raising the temperature to 90 ℃, and continuously drying for 15h to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 75 ℃, and continuously drying for 8 hours to ensure that the water content of the sawn timber reaches 15-20%;
f. and (3) third pretreatment: heating to 80 ℃, and continuously drying for 15h to enable the water content of the sawn timber to reach 10-15%;
g. and (3) final treatment: the temperature is increased to 95 ℃, and the drying is continued for 8 hours, so that the water content of the sawn timber is 10 percent;
(4) placing the dried sawn timber at 14 deg.C and 55% relative humidity for 3 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
Example 2
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 12mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material stack by using a filler strip stacking method, wherein when the material stack is built, the interval between two adjacent sawn materials is 66% of the width of the sawn materials, the distance between two adjacent filler strips is 54cm, the transverse distance between the material stacks is 18cm, the material stacks in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material stacks, a heavy object is pressed on the top of each material stack, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the timber pile at 61 ℃ for 19h, and controlling the temperature rise rate in low-temperature preheating at 2 ℃/h to enable the water content of the sawn timber to reach 30-50%;
c. first pretreatment: raising the temperature to 71 ℃, and continuously drying for 12 hours to ensure that the water content of the sawn timber reaches 25-30%;
d. intermediate treatment: raising the temperature to 91 ℃, and continuing to dry for 14h to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 74 ℃, and continuously drying for 9 hours to ensure that the water content of the sawn timber reaches 15-20%;
f. and (3) third pretreatment: the temperature is raised to 82 ℃, and the drying is continued for 14 hours, so that the water content of the sawn timber reaches 10 to 15 percent;
g. and (3) final treatment: heating to 96 ℃, and continuously drying for 8 hours to ensure that the water content of the sawn timber is 10%;
(4) placing the dried sawn timber at 15 deg.C and 54% relative humidity for 3 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
Example 3
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 15mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material stack by using a filler strip stacking method, wherein when the material stack is built, the interval between two adjacent sawn materials is 63% of the width of the sawn materials, the distance between two adjacent filler strips is 52cm, the transverse distance between the material stacks is 15cm, the material stacks in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material stacks, a heavy object is pressed on the top of each material stack, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the timber pile at 62 ℃ for 18h, and controlling the heating rate at 2 ℃/h during low-temperature preheating to ensure that the water content of the sawn timber reaches 30-50%;
c. first pretreatment: raising the temperature to 72 ℃, and continuing to dry for 11h to enable the water content of the sawn timber to reach 25-30%;
d. intermediate treatment: raising the temperature to 92 ℃, and continuously drying for 13h to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 73 ℃, and continuously drying for 10 hours to ensure that the water content of the sawn timber reaches 15-20%;
f. and (3) third pretreatment: heating to 84 ℃, and continuously drying for 13h to enable the water content of the sawn timber to reach 10-15%;
g. and (3) final treatment: the temperature is increased to 97 ℃, and the drying is continued for 7 hours, so that the water content of the sawn timber is 10 percent;
(4) placing the dried sawn timber at 14 deg.C and 53% relative humidity for 3 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
Example 4
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 18mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material pile by using a filler strip stacking method, wherein when the material pile is built, the interval between two adjacent sawn materials is 69% of the width of the sawn materials, the distance between two adjacent filler strips is 56cm, the transverse distance between the material piles is 20cm, the material piles in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material piles, a heavy object is pressed on the top of each material pile, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the timber pile at 63 ℃ for 17h, and controlling the heating rate at 3 ℃/h during low-temperature preheating to ensure that the water content of the sawn timber reaches 30-50%;
c. first pretreatment: raising the temperature to 73 ℃, and continuously drying for 11h to ensure that the water content of the sawn timber reaches 25-30%;
d. intermediate treatment: raising the temperature to 93 ℃, and continuously drying for 13h to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 72 ℃, and continuously drying for 10h to enable the water content of the sawn timber to reach 15-20%;
f. and (3) third pretreatment: heating to 86 ℃, and continuously drying for 14h to enable the water content of the sawn timber to reach 10-15%;
g. and (3) final treatment: heating to 98 ℃, and continuously drying for 7h to ensure that the water content of the sawn timber is 10%;
(4) placing the dried sawn timber at 16 deg.C and 50% relative humidity for 2 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
Example 5
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 22mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material stack by using a filler strip stacking method, wherein when the material stack is built, the interval between two adjacent sawn materials is 72% of the width of the sawn materials, the distance between two adjacent filler strips is 58cm, the transverse distance between the material stacks is 25cm, the material stacks in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material stacks, a heavy object is pressed on the top of each material stack, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the timber pile at 64 ℃ for 16h, and controlling the heating rate at 3 ℃/h during low-temperature preheating to ensure that the water content of the sawn timber reaches 30-50%;
c. first pretreatment: raising the temperature to 74 ℃, and continuing to dry for 11 hours to enable the water content of the sawn timber to reach 25-30%;
d. intermediate treatment: raising the temperature to 94 ℃, and continuously drying for 13h to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 71 ℃, and continuously drying for 11h to enable the water content of the sawn timber to reach 15-20%;
f. and (3) third pretreatment: heating to 88 ℃, and continuously drying for 12h to enable the water content of the sawn timber to reach 10-15%;
g. and (3) final treatment: heating to 99 ℃, and continuously drying for 6h to ensure that the water content of the sawn timber is 10%;
(4) placing the dried sawn timber at 15 deg.C and 55% relative humidity for 2 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
Example 6
The production process of the small-diameter wood integrated material comprises the following steps:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the log into sawn timber with the thickness of 24mm and the length of 2500mm by using a frame saw;
(3) and (3) drying: the sawn timber is sent into a drying kiln for drying, and the drying process is as follows:
a. building a material pile: the method comprises the following steps of building a material stack by using a filler strip stacking method, wherein when the material stack is built, the interval between two adjacent sawn materials is 75% of the width of the sawn materials, the distance between two adjacent filler strips is 60cm, the transverse distance between the material stacks is 30cm, the material stacks in the same row are connected along the length direction of the sawn materials, no gap or 10mm of gap is left between two adjacent material stacks, a heavy object is pressed on the top of each material stack, and the heavy object is generally a cement block;
b. low-temperature preheating: drying the sawn timber pile at 65 ℃ for 15h, and controlling the heating rate at 3 ℃/h during low-temperature preheating to enable the water content of the sawn timber to reach 30-50%;
c. first pretreatment: raising the temperature to 75 ℃, and continuously drying for 10 hours to ensure that the water content of the sawn timber reaches 25-30%;
d. intermediate treatment: raising the temperature to 95 ℃, and continuing to dry for 12 hours to enable the water content of the sawn timber to reach 20-25%;
e. and (3) second pretreatment: reducing the temperature to 70 ℃, and continuously drying for 12h to enable the water content of the sawn timber to reach 15-20%;
f. and (3) third pretreatment: heating to 90 ℃, and continuously drying for 12h to enable the water content of the sawn timber to reach 10-15%;
g. and (3) final treatment: the temperature is increased to 100 ℃, and the drying is continued for 6 hours, so that the water content of the sawn timber is 10 percent;
(4) placing the dried sawn timber at 16 deg.C and 52% relative humidity for 3 days;
(5) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(6) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
In the above embodiment, the gap between the stacks placed in the kiln in the longitudinal direction should not be too large, and preferably should be so large that it can be engaged, thus preventing the ends of the sawn timber from cracking. The intermediate treatment prevents the sawn timber from cracking and surface hardening. The top of the stack is provided with a weight to prevent the upper sawn timber from warping.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The production process of the small-diameter wood integrated material is characterized by comprising the following steps of:
(1) selecting materials: selecting logs with the diameter of 16-24 cm;
(2) frame sawing: processing the raw wood into sawn timber by using a frame saw;
(3) and (3) drying: and conveying the sawn timber into a drying kiln for drying, wherein the drying process comprises the following steps:
a. building a material pile: building by adopting a filler strip stacking method, and pressing a heavy object on the top of the material stack;
b. low-temperature preheating: drying the above materials at 60-65 deg.C for 15-20 hr;
c. first pretreatment: raising the temperature to 70-75 ℃, and continuously drying for 10-12h to ensure that the water content of the sawn timber reaches 30-50%;
d. intermediate treatment: raising the temperature to 90-95 ℃, and continuously drying for 12-15h to make the water content of the sawn timber reach 25-30%;
e. and (3) second pretreatment: reducing the temperature to 70-75 ℃, and continuously drying for 8-12h to enable the water content of the sawn timber to reach 20-25%;
f. and (3) third pretreatment: heating to 80-90 deg.C, and continuously drying for 12-15 hr to make the water content of sawn timber reach 15-20%;
g. and (3) final treatment: heating to 95-100 deg.C, and continuously drying for 6-8 hr to make the water content of sawn timber reach 9-11%;
(4) planing the side surface: planing the side surfaces of the dried sawn timber by using a double-sided planer;
(5) splicing: and splicing the sawn timber with the well planed side surfaces into a large plate.
2. The small-diameter wood integrated timber production process as claimed in claim 1, wherein the temperature rise rate during low-temperature preheating is controlled to be 2-3 ℃/h.
3. The process for producing small-diameter wood integrated timber as claimed in claim 1, wherein the dried sawn timber is subjected to side surface planing after being placed at a temperature of 14-16 ℃ and a relative humidity of 50-55% for 2-3 days.
4. The process for producing small-diameter wood laminated wood according to claim 1, wherein the sawn wood has a thickness of 12-24 mm.
5. A production process of a small-diameter wood integrated material as claimed in claim 4, wherein when the wood pile is built, the interval between two adjacent sawn wood is 60-75% of the width of the sawn wood, and the distance between two adjacent filler strips is 50-60 cm.
6. A small-diameter wood integrated material production process according to claim 5, wherein the thickness of the filler strip is 30 mm.
7. The process for producing small-diameter wood laminated wood according to claim 1, wherein the sawn timber is 2500mm in length.
8. A process for producing a small-diameter wood veneer according to claim 1, wherein the transverse distance between the wood piles is 10-30 cm.
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| CN202010726028.9A CN111805624A (en) | 2020-07-24 | 2020-07-24 | Production process of small-diameter wood integrated material |
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| CN202010726028.9A CN111805624A (en) | 2020-07-24 | 2020-07-24 | Production process of small-diameter wood integrated material |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4351680A (en) * | 1978-04-06 | 1982-09-28 | Baltek Corporation | Technique for converting balsa logs into contourable panels |
| CN1709666A (en) * | 2005-06-13 | 2005-12-21 | 浙江林学院 | Small-diameter wood sheared integrating timber production method |
| CN1923478A (en) * | 2006-09-27 | 2007-03-07 | 云南辉龙木材开发有限公司 | Bamboo wood and preparation method thereof |
| CN101417451A (en) * | 2008-11-20 | 2009-04-29 | 北华大学 | The manufacture method of small wood integrated shaving thin-wood and leveling drying device thereof |
| CN101450495A (en) * | 2008-12-22 | 2009-06-10 | 国际竹藤网络中心 | Eucalypt artificial wood drying method |
-
2020
- 2020-07-24 CN CN202010726028.9A patent/CN111805624A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4351680A (en) * | 1978-04-06 | 1982-09-28 | Baltek Corporation | Technique for converting balsa logs into contourable panels |
| CN1709666A (en) * | 2005-06-13 | 2005-12-21 | 浙江林学院 | Small-diameter wood sheared integrating timber production method |
| CN1923478A (en) * | 2006-09-27 | 2007-03-07 | 云南辉龙木材开发有限公司 | Bamboo wood and preparation method thereof |
| CN101417451A (en) * | 2008-11-20 | 2009-04-29 | 北华大学 | The manufacture method of small wood integrated shaving thin-wood and leveling drying device thereof |
| CN101450495A (en) * | 2008-12-22 | 2009-06-10 | 国际竹藤网络中心 | Eucalypt artificial wood drying method |
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Application publication date: 20201023 |