CN114393665A - Medium-density fiberboard and preparation method thereof - Google Patents
Medium-density fiberboard and preparation method thereof Download PDFInfo
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- CN114393665A CN114393665A CN202111556841.7A CN202111556841A CN114393665A CN 114393665 A CN114393665 A CN 114393665A CN 202111556841 A CN202111556841 A CN 202111556841A CN 114393665 A CN114393665 A CN 114393665A
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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
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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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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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
- B27N3/143—Orienting the particles or fibres
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a medium-density fiberboard and a preparation method thereof, wherein the medium-density fiberboard comprises, by weight, 100-106 parts of wood fibers, 30-48 parts of bamboo fibers, 20-34 parts of sisal, 6-16 parts of bagasse, 5-13 parts of corn straws, 15-33 parts of an adhesive and 10-20 parts of a waterproof agent. The preparation method of the medium-density fiberboard comprises the following steps: preparing materials, drying, mixing materials, paving, hot pressing and post-processing. The medium-density fiberboard and the preparation method thereof provided by the invention improve the toughness and the elastic modulus of the board.
Description
Technical Field
The invention relates to the technical field of medium-density fiberboards, in particular to a medium-density fiberboard and a preparation method thereof.
Background
Medium-density fiberboard (MDF) is one kind of artificial board, and is produced with plant fiber or timber fiber as main material and through fiber separation, material preparation, gluing, drying, spreading, pre-pressing, hot pressing, quality inspection and other steps to produce medium-density fiberboard with density of 0.65-0.80 g/cm3Between the plates. Compared with other boards, the MDF has excellent performance, has the characteristics of uniform internal structure, moderate density, light weight, high strength, good dimensional stability, flat and smooth surface and the like, and has high wood utilization rate, low product cost, excellent physical and mechanical properties and machining performance, and can be used for surface decoration in various modes, which is more close to natural wood. Therefore, the material is widely applied to building materials, furniture manufacturing, interior decoration, television shell and sound equipment manufacturing, is also an ideal material for vehicle and ship decoration, and the demand is continuously increased.
Disclosure of Invention
Aiming at the problems, the invention provides a medium-density fiberboard and a preparation method thereof, which improve the toughness and the elastic modulus of the board.
The invention adopts the following technical scheme to realize the purpose:
the medium-density fiberboard comprises, by weight, 100-106 parts of wood fibers, 30-48 parts of bamboo fibers, 20-34 parts of sisal, 6-16 parts of bagasse, 5-13 parts of corn straws, 15-33 parts of an adhesive and 10-20 parts of a waterproof agent.
Preferably, the wood fiber is one or a combination of more than two of eucalyptus fiber, poplar fiber, pine fiber, maple fiber and fir fiber in any proportion.
Preferably, the adhesive is one or a combination of more than two of urea-formaldehyde resin adhesive, melamine modified urea-formaldehyde resin adhesive, melamine formaldehyde resin adhesive, phenol-formaldehyde resin adhesive, resorcinol resin adhesive, isocyanate resin adhesive and amino resin adhesive in any proportion.
A preparation method of a medium-density fiberboard comprises the following steps:
(1) preparing materials: respectively preheating, cooking and softening sisal hemp, bagasse and corn straw, and then respectively separating by a separator to obtain sisal hemp fiber, bagasse fiber and corn straw fiber;
(2) drying: the temperature of the dryer is controlled to be 150-200 ℃, and the wood fiber, the bamboo fiber, the sisal fiber, the bagasse fiber and the corn straw fiber are respectively dried;
(3) mixing and paving: mixing wood fiber, bamboo fiber, sisal fiber, bagasse fiber, corn straw fiber, an adhesive and a waterproof agent in proportion to obtain a mixed material, preliminarily forming the mixed material by a vacuum airflow method from a feeding fan to a spreading machine to obtain a plate blank, and pressing the plate blank into a plate shape by a sweeping roller and a prepressing machine;
(4) hot pressing: the plate obtained by prepressing is put into a hot press for hot press forming to obtain a plate, and the temperature of the hot press is adjusted to 160-220 ℃;
(5) and (3) post-treatment: the plate coming out of the hot press is cooled for 20-36 hours by a plate cooling machine, and then edge sawing is carried out to saw the plate into a plate with a standard breadth; finally, directly warehousing or sending into a sander for surface treatment.
Preferably, in the step (2), the wood fiber is dried until the water content is between 8% and 10%.
Preferably, in the step (2), the bamboo fibers, the bagasse fibers and the corn straw fibers are all dried until the moisture content is between 4% and 7%.
Preferably, in the step (2), the sisal fibers are dried until the water content is between 3% and 6%.
Preferably, in step (4), the hot pressing process is as follows: boosting the pressure to 2.5-10.5 MPa within 8-26 s, and maintaining the pressure for 5-25 s; reducing the pressure to 1.0-4.0 MPa within 10-20 s, and maintaining the pressure for 50-250 s; boosting the pressure to 2.6-6 MPa within 10-32 s, and maintaining the pressure for 30-260 s; reducing the pressure to 0.6-2.6 MPa within 10-20 s; reducing the pressure to 0MPa within 20-50 s.
The invention has the beneficial effects that:
in the preparation raw materials of the medium-density fiberboard provided by the invention, the sisal fiber product has the effects of toughness, wear resistance, rigid and flexible texture, high elasticity, no hardening and brittle fracture at low temperature, no mildew, corrosion resistance, no toxicity, no allergy, cleanness, no pollution, static electricity prevention and the like. The bagasse has small specific gravity and good fiber quality, the prepared plate has high strength and light weight, and the produced plate and section bar are not damaged by organisms, have low water absorption and are not corroded by seawater; good fire resistance, good flame retardant property, good machining property and decorative property. Therefore, the medium-density fiberboard prepared by using the raw materials provided by the invention improves the toughness and the elastic modulus of the board.
According to the preparation method of the medium-density fiberboard, the medium-density fiberboard is dried to different water contents according to the characteristics of wood fiber, bamboo fiber, sisal fiber, bagasse fiber and corn straw fiber, so that the performances of various materials are exerted to the utmost extent, and the toughness and the elastic modulus of the board are further improved.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The medium-density fiberboard comprises, by weight, 100 parts of wood fiber, 30 parts of bamboo fiber, 20 parts of sisal, 6 parts of bagasse, 5 parts of corn straw, 15 parts of an adhesive and 10 parts of a waterproof agent. Wherein the wood fiber is the combination of eucalyptus fiber and poplar fiber in any proportion. The adhesive is the combination of urea-formaldehyde resin adhesive, melamine modified urea-formaldehyde resin adhesive and melamine formaldehyde resin adhesive in any proportion. The adhesive has low cost and good storage stability.
A preparation method of a medium-density fiberboard comprises the following steps:
(1) preparing materials: respectively preheating, cooking and softening the sisal, the bagasse and the corn straw, and then respectively separating the sisal, the bagasse and the corn straw by a separator to obtain sisal fibers, bagasse fibers and corn straw fibers.
(2) Drying: controlling the temperature of the dryer at 150 ℃, and respectively drying the wood fiber, the bamboo fiber, the sisal fiber, the bagasse fiber and the corn straw fiber; the method specifically comprises the following steps: drying the wood fiber until the water content is 8 percent. And drying the bamboo fibers, the bagasse fibers and the corn straw fibers until the water content is 4%. Drying the sisal fibers until the water content is 3%.
(3) Mixing and paving: mixing wood fiber, bamboo fiber, sisal fiber, bagasse fiber, corn straw fiber, an adhesive and a waterproof agent in proportion to obtain a mixed material, feeding the mixed material to a spreading machine by a feeding fan, preliminarily forming the mixed material by adopting a vacuum airflow method to obtain a plate blank, and pressing the plate blank into a plate shape by a sweeping roller and a prepressing machine.
(4) Hot pressing: placing the plate obtained by prepressing into a hot press for hot press forming to obtain a plate, and adjusting the temperature of the hot press to 160 ℃; the hot pressing process comprises the following steps: boosting the pressure to 2.5MPa within 8s, and maintaining the pressure for 5 s; reducing the pressure to 1.0MPa within 10s, and maintaining the pressure for 50 s; boosting the pressure to 2.6MPa within 10s, and maintaining the pressure for 30 s; reducing the pressure to 0.6MPa within 10 s; reducing the pressure to 0MPa within 20 s.
(5) And (3) post-treatment: the plate from the hot press is cooled for 20 hours by a plate cooling machine, and then edge sawing is carried out to saw the plate into a plate with standard breadth; finally, directly warehousing or sending into a sander for surface treatment.
Example 2
The medium-density fiberboard comprises, by weight, 103 parts of wood fiber, 39 parts of bamboo fiber, 27 parts of sisal, 11 parts of bagasse, 9 parts of corn straw, 24 parts of an adhesive and 15 parts of a waterproof agent. Wherein the wood fiber is the combination of pine fiber, maple fiber and fir fiber in any proportion. The adhesive is the combination of phenolic resin adhesive, resorcinol resin adhesive, isocyanate resin adhesive and amino resin adhesive in any proportion. The adhesive has low cost and good storage stability.
A preparation method of a medium-density fiberboard comprises the following steps:
(1) preparing materials: respectively preheating, cooking and softening the sisal, the bagasse and the corn straw, and then respectively separating the sisal, the bagasse and the corn straw by a separator to obtain sisal fibers, bagasse fibers and corn straw fibers.
(2) Drying: controlling the temperature of the dryer at 175 ℃, and respectively drying the wood fiber, the bamboo fiber, the sisal fiber, the bagasse fiber and the corn straw fiber; the method specifically comprises the following steps: drying the wood fiber until the water content is 9 percent. And drying the bamboo fibers, the bagasse fibers and the corn straw fibers until the water content is 5.5%. Drying the sisal fibers until the water content is 4.5%.
(3) Mixing and paving: mixing wood fiber, bamboo fiber, sisal fiber, bagasse fiber, corn straw fiber, an adhesive and a waterproof agent in proportion to obtain a mixed material, feeding the mixed material to a spreading machine by a feeding fan, preliminarily forming the mixed material by adopting a vacuum airflow method to obtain a plate blank, and pressing the plate blank into a plate shape by a sweeping roller and a prepressing machine.
(4) Hot pressing: placing the plate obtained by prepressing into a hot press for hot press forming to obtain a plate, and adjusting the temperature of the hot press to 190 ℃; the hot pressing process comprises the following steps: increasing the pressure to 6.5MPa within 17s, and maintaining the pressure for 15 s; reducing the pressure to 2.5MPa within 15s, and maintaining the pressure for 150 s; boosting the pressure to 4.3MPa within 21s, and maintaining the pressure for 145 s; reducing the pressure to 1.6MPa within 15 s; the pressure is reduced to 0MPa for 35 s.
(5) And (3) post-treatment: the plate from the hot press is cooled for 28 hours by a plate cooling machine, and then edge sawing is carried out to saw the plate into a plate with standard breadth; finally, directly warehousing or sending into a sander for surface treatment.
Example 3
The medium-density fiberboard comprises, by weight, 106 parts of wood fiber, 48 parts of bamboo fiber, 34 parts of sisal, 16 parts of bagasse, 13 parts of corn straw, 33 parts of an adhesive and 20 parts of a waterproof agent. Wherein the wood fiber is the combination of eucalyptus fiber, poplar fiber, pine fiber, maple fiber and fir fiber in any proportion. The adhesive is a combination of urea-formaldehyde resin adhesive, melamine modified urea-formaldehyde resin adhesive, melamine formaldehyde resin adhesive, phenol-formaldehyde resin adhesive, resorcinol resin adhesive, isocyanate resin adhesive and amino resin adhesive in any proportion. The adhesive has low cost and good storage stability.
A preparation method of a medium-density fiberboard comprises the following steps:
(1) preparing materials: respectively preheating, cooking and softening the sisal, the bagasse and the corn straw, and then respectively separating the sisal, the bagasse and the corn straw by a separator to obtain sisal fibers, bagasse fibers and corn straw fibers.
(2) Drying: controlling the temperature of the dryer at 200 ℃, and respectively drying the wood fiber, the bamboo fiber, the sisal fiber, the bagasse fiber and the corn straw fiber; the method specifically comprises the following steps: drying the wood fiber until the water content is 10 percent. And drying the bamboo fibers, the bagasse fibers and the corn straw fibers until the water content is 7%. Drying the sisal fibers until the water content is 6%.
(3) Mixing and paving: mixing wood fiber, bamboo fiber, sisal fiber, bagasse fiber, corn straw fiber, an adhesive and a waterproof agent in proportion to obtain a mixed material, feeding the mixed material to a spreading machine by a feeding fan, preliminarily forming the mixed material by adopting a vacuum airflow method to obtain a plate blank, and pressing the plate blank into a plate shape by a sweeping roller and a prepressing machine.
(4) Hot pressing: placing the plate obtained by prepressing into a hot press for hot press forming to obtain a plate, and adjusting the temperature of the hot press to 220 ℃; the hot pressing process comprises the following steps: boosting the pressure to 10.5MPa within 26s, and maintaining the pressure for 25 s; reducing the pressure to 4.0MPa within 20s, and maintaining the pressure for 250 s; increasing the pressure to 6MPa within 32s, and maintaining the pressure for 260 s; reducing the pressure to 2.6MPa within 20 s; the pressure is reduced to 0MPa for 50 s.
(5) And (3) post-treatment: the plate from the hot press is cooled for 36 hours by a plate cooling machine, and then edge sawing is carried out to saw the plate into a plate with standard breadth; finally, directly warehousing or sending into a sander for surface treatment.
The medium-density fiberboard produced by the invention has the density of 0.67-0.7 g/cm3And the thickness is 13-19 mm, and the performance of the material is tested to obtain the following performance detection results:
the static bending strength of the product is 29.2MPa, the internal bonding strength is 0.96MPa, the surface bonding strength is 1.02MPa, the water absorption thickness expansion rate is 7.3 percent, and the elastic modulus is 2730MPa, so that the product meets the specification of high-class products of medium-density fiberboard products.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The medium-density fiberboard is characterized by comprising, by weight, 100-106 parts of wood fibers, 30-48 parts of bamboo fibers, 20-34 parts of sisal, 6-16 parts of bagasse, 5-13 parts of corn straws, 15-33 parts of an adhesive and 10-20 parts of a waterproof agent.
2. The medium density fiberboard of claim 1, wherein the wood fiber is one or a combination of two or more of eucalyptus fiber, poplar fiber, pine fiber, maple fiber and fir fiber in any ratio.
3. The medium density fiberboard of claim 1, wherein the adhesive is one or a combination of two or more of urea-formaldehyde resin adhesive, melamine-modified urea-formaldehyde resin adhesive, melamine-formaldehyde resin adhesive, phenol-formaldehyde resin adhesive, resorcinol resin adhesive, isocyanate resin adhesive, and amino resin adhesive in any ratio.
4. A method of making a medium density fiberboard according to any one of claims 1 to 3, comprising the steps of:
(1) preparing materials: respectively preheating, cooking and softening sisal hemp, bagasse and corn straw, and then respectively separating by a separator to obtain sisal hemp fiber, bagasse fiber and corn straw fiber;
(2) drying: the temperature of the dryer is controlled to be 150-200 ℃, and the wood fiber, the bamboo fiber, the sisal fiber, the bagasse fiber and the corn straw fiber are respectively dried;
(3) mixing and paving: mixing wood fiber, bamboo fiber, sisal fiber, bagasse fiber, corn straw fiber, an adhesive and a waterproof agent in proportion to obtain a mixed material, preliminarily forming the mixed material by a vacuum airflow method from a feeding fan to a spreading machine to obtain a plate blank, and pressing the plate blank into a plate shape by a sweeping roller and a prepressing machine;
(4) hot pressing: the plate obtained by prepressing is put into a hot press for hot press forming to obtain a plate, and the temperature of the hot press is adjusted to 160-220 ℃;
(5) and (3) post-treatment: the plate coming out of the hot press is cooled for 20-36 hours by a plate cooling machine, and then edge sawing is carried out to saw the plate into a plate with a standard breadth; finally, directly warehousing or sending into a sander for surface treatment.
5. The method for preparing the medium-density fiberboard of claim 4, wherein in the step (2), the wood fiber is dried until the water content is between 8% and 10%.
6. The preparation method of the medium-density fiberboard of claim 4, wherein in the step (2), the bamboo fiber, the bagasse fiber and the corn stalk fiber are all dried until the moisture content is between 4% and 7%.
7. The method for preparing the medium-density fiberboard of claim 4, wherein in the step (2), the sisal fibers are dried until the water content is between 3% and 6%.
8. The method for preparing a medium density fiberboard of claim 4, wherein in the step (4), the hot pressing process is as follows: boosting the pressure to 2.5-10.5 MPa within 8-26 s, and maintaining the pressure for 5-25 s; reducing the pressure to 1.0-4.0 MPa within 10-20 s, and maintaining the pressure for 50-250 s; boosting the pressure to 2.6-6 MPa within 10-32 s, and maintaining the pressure for 30-260 s; reducing the pressure to 0.6-2.6 MPa within 10-20 s; reducing the pressure to 0MPa within 20-50 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111556841.7A CN114393665A (en) | 2021-12-18 | 2021-12-18 | Medium-density fiberboard and preparation method thereof |
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| CN202111556841.7A CN114393665A (en) | 2021-12-18 | 2021-12-18 | Medium-density fiberboard and preparation method thereof |
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| CN114393665A true CN114393665A (en) | 2022-04-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115609721A (en) * | 2022-11-01 | 2023-01-17 | 佳诺威集团股份有限公司 | Low-formaldehyde-emission fiberboard and production method thereof |
-
2021
- 2021-12-18 CN CN202111556841.7A patent/CN114393665A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115609721A (en) * | 2022-11-01 | 2023-01-17 | 佳诺威集团股份有限公司 | Low-formaldehyde-emission fiberboard and production method thereof |
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