CN104339435A - Hot pressing process for medium density fiberboards - Google Patents
Hot pressing process for medium density fiberboards Download PDFInfo
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- CN104339435A CN104339435A CN201410701175.5A CN201410701175A CN104339435A CN 104339435 A CN104339435 A CN 104339435A CN 201410701175 A CN201410701175 A CN 201410701175A CN 104339435 A CN104339435 A CN 104339435A
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- hot press
- hot pressing
- pressing process
- slab
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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
- B27N3/12—Moulding of mats from fibres
-
- 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
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
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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 hot pressing process for medium density fiberboards. The hot pressing process comprises feeding, a first hot pressing stage, a second hot pressing stage, a third hot pressing stage and discharging. The hot pressing process is reasonable; by effectively controlling pressurizing time, pressure releasing time and pressure maintaining time of a hot press, the hot pressing time is shortened by 30-50 seconds compared with the time in the traditional hot pressing process, and the internal bond strength of slabs is improved by 20-30 percent; moreover, performance indexes of boards are strictly controlled, so that the thickness of the hot-pressed slabs is more accurate, the thickness of solidified layers of the boards after solidification is 0.3-0.8mm, and the manufacturing cost is reduced to the greatest degree; meanwhile, the problem of negative influence of steam pressure in core layers of the slabs on the performance of the boards is avoided, the stability of product quality is improved, the rejection rate of products is greatly reduced, and the production efficiency is improved; the method is also suitable for the hot pressing process for medium density fiberboards in different thicknesses, and is easily promoted on a large scale.
Description
Technical field
The invention belongs to wood-based plate manufacturing technology field, be specifically related to a kind of heat pressing process of medium density fibre board (MDF).
Background technology
Medium density fibre board (MDF) is that one is widely used in Furniture manufacture, the product of the industries such as indoor decoration, building, packaging, household electrical appliances.The production line of medium density fibre board (MDF) is divided into section workshop section, defibrator process workshop section and hot press period, and heat pressing process is the important procedure that medium density fibre board (MDF) is produced, the general principle of heat pressing process is: closed by pressing plate, the fiberboard executing adhesive is compressed to the thickness of formulation, and heated by the contact of pressing plate, make the wooden structures unit in slab and adhesive that some physical change arranged and chemical changes occur, make adhesive complete solidification, thus form the density fiber board having and specify physical mechanics.After traditional heat pressing process is generally slab loading, hot press quick-make is to final position, open hot press after pressurize a period of time and complete hot pressing, in above-mentioned hot pressing, after slab is heated, the steam gasification of steel slab surface easily carries a large amount of heats and shifts from sandwich layer, make the heat that sandwich layer accumulated inside is a large amount of, produce larger vapour pressure, and the vapour pressure produced is difficult to discharge in sandwich layer, easily the performance of sheet material is impacted, cause the slab performance difference of production large, be exactly that traditional heat pressing process only controls the pressure of hot pressing in addition, and the hot press pressurization ignored, pressure release, the time of pressurize and the control of slab thickness, not only cause the time of hot pressing long, the inefficiency of hot pressing, and state is blindly in for a long time to the technological parameter of slab thickness, easily make the density of slab too high, raw materials consumption is large, the consumption of adhesive is large, the cost manufactured is high, cured layer is blocked up, after hot pressing, the waste rate of slab is 10 ~ 20%, as can be seen here, to raw-material norm controlling in heat pressing process, pressure during hot pressing, temperature, time is the key factor affecting product quality.Therefore, develop that a kind of rational technology, hot pressing efficiency are high, low cost of manufacture, the heat pressing process that effectively can improve the stability of slab and the medium density fibre board (MDF) of production capacity be desirability.
Summary of the invention
In order to solve Problems existing in background technology, the object of the present invention is to provide that a kind of rational technology, hot pressing efficiency are high, low cost of manufacture, effectively can improve the heat pressing process of the stability of slab and the medium density fibre board (MDF) of production capacity.
The object of the present invention is achieved like this, a kind of heat pressing process of medium density fibre board (MDF), comprises that hot press closes, the operation of hot-press gluing and unlatching press, and concrete steps are as follows:
1. described hot press opens shelves to full-size, after slab loads and puts in place on hot press, opens hot press;
2. described hot press rapid pressure in 2 ~ 10s also applies the pressure of 165 ~ 175MPa gradually to slab, and when the top board being pressurized to hot press is closed to distance slab 0.6 ~ 6mm, stop pressurization, pressurize 28 ~ 32s, now the first hot press period completes;
3. described hot press starts again, and in 5 ~ 20s, reduction of blood pressure in high-speed also unloads gradually and is depressed into 2.5 ~ 3.0MPa, and stop release, pressurize 80 ~ 100s, now the second hot press period completes;
4. described hot press starts again, and rapid pressure in 2 ~ 10s also gradually to the pressure of slab applying 6 ~ 10MPa, now stops pressurization, and pressurize 50 ~ 70s Post RDBMS voltage stabilizing process completes i.e. the 3rd hot press period and completes;
5. described hot press unloads gradually and presses off shelves in 2 ~ 100s, until hot press open grade size restoration to maximum open grade size time, release completes taking-up sheet material.
Heat pressing process of the present invention is reasonable, by effectively controlling the pressurization of hot press, release, the time of pressurize, the time of hot pressing is compared traditional heat pressing process and shortens 30 ~ 50s, the internal bond strength of slab improves 20 ~ 30, also have is exactly by carrying out strict control to the performance indications of sheet material, make the thickness of slab after hot pressing more accurate, after solidification, the thickness of its cured layer is at 0.3 ~ 0.8mm, farthest reduce the cost of manufacture, slab sandwich layer steam inside pressure can be avoided the negative problem that can affect of sheet material simultaneously, change the distribution of slab end face density, improve the performance of sandwich layer, thus improve the stability of product quality, greatly reduce the percent defective of product, improve production efficiency, and the method is also applicable to the heat pressing process of the medium-density plate of more thickness, be easy to large-scale popularization.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further illustrated, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or replacement, all belong to protection scope of the present invention.
embodiment 1:
A heat pressing process for medium density fibre board (MDF), comprises that hot press closes, the operation of hot-press gluing and unlatching press, and concrete steps are as follows:
1. described hot press opens shelves to full-size, after slab loads and puts in place on hot press, opens hot press;
2. described hot press rapid pressure in 2s also applies the pressure of 165MPa gradually to slab, and before hot pressing, the moisture control of slab is 9%, and resin added controls at 168kg/m
3, hot pressing temperature controls at 168 DEG C, and when the top board being pressurized to hot press is closed to distance slab 0.6mm, stop pressurization, pressurize 28s, now the first hot press period completes;
3. described hot press starts again, and hot pressing temperature controls at 170 DEG C, and in 5s, reduction of blood pressure in high-speed also unloads gradually and is depressed into 2.5MPa, and stop release, pressurize 80s, now the second hot press period completes;
4. described hot press starts again, and hot pressing temperature controls at 175 DEG C, and rapid pressure in 2s also gradually to the pressure of slab applying 60MPa, now stops pressurization, and pressurize 50s Post RDBMS voltage stabilizing process completes i.e. the 3rd hot press period and completes;
5. described hot press unloads gradually and presses off shelves in 2s, until hot press open grade size restoration to maximum open grade size time, release completes taking-up sheet material.
Adopt the medium density fibre board (MDF) that the heat pressing process described in embodiment 1 is obtained, the steady quality of sheet material, percent defective is 1.2%, and internal bond strength improves 22%, and cured layer thickness is 0.6mm, and the time of hot pressing is compared traditional heat pressing process and shortens 30s.
embodiment 2
A heat pressing process for medium density fibre board (MDF), comprises that hot press closes, the operation of hot-press gluing and unlatching press, and concrete steps are as follows:
1. described hot press opens shelves to full-size, after slab loads and puts in place on hot press, opens hot press;
2. described hot press rapid pressure in 6s also applies the pressure of 170MPa gradually to slab, and before hot pressing, the moisture control of slab is 9.5%, and resin added controls at 170kg/m
3, hot pressing temperature controls at 175 DEG C, and when the top board being pressurized to hot press is closed to distance slab 3mm, stop pressurization, pressurize 30s, now the first hot press period completes;
3. described hot press starts again, and hot pressing temperature controls at 172 DEG C, and in 13s, reduction of blood pressure in high-speed also unloads gradually and is depressed into 2.8MPa, and stop release, pressurize 90s, now the second hot press period completes;
4. described hot press starts again, and hot pressing temperature controls at 168 DEG C, and rapid pressure in 6s also gradually to the pressure of slab applying 8MPa, now stops pressurization, and pressurize 65s Post RDBMS voltage stabilizing process completes i.e. the 3rd hot press period and completes;
5. described hot press unloads gradually and presses off shelves in 55s, until hot press open grade size restoration to maximum open grade size time, release completes taking-up sheet material.
Adopt the medium density fibre board (MDF) that the heat pressing process described in embodiment 2 is obtained, the steady quality of sheet material, percent defective is 0.8%, and internal bond strength improves 28%, and cured layer thickness is 0.3mm, and the time of hot pressing is compared traditional heat pressing process and shortens 40s.
embodiment 3:
A heat pressing process for medium density fibre board (MDF), comprises that hot press closes, the operation of hot-press gluing and unlatching press, and concrete steps are as follows:
1. described hot press opens shelves to full-size, after slab loads and puts in place on hot press, opens hot press;
2. described hot press rapid pressure in 10s also applies the pressure of 175MPa gradually to slab, and before hot pressing, the moisture control of slab is 10%, and resin added controls at 172kg/m
3, hot pressing temperature controls at 171 DEG C, and when the top board being pressurized to hot press is closed to distance slab 6mm, stop pressurization, pressurize 32s, now the first hot press period completes;
3. described hot press starts again, and hot pressing temperature controls at 175 DEG C, and in 20s, reduction of blood pressure in high-speed also unloads gradually and is depressed into 3.0MPa, and stop release, pressurize 100s, now the second hot press period completes;
4. described hot press starts again, and hot pressing temperature controls at 168 DEG C, and rapid pressure in 10s also gradually to the pressure of slab applying 10MPa, now stops pressurization, and pressurize 70s Post RDBMS voltage stabilizing process completes i.e. the 3rd hot press period and completes;
5. described hot press unloads gradually and presses off shelves in 100s, until hot press open grade size restoration to maximum open grade size time, release completes taking-up sheet material.
Adopt the medium density fibre board (MDF) that the heat pressing process described in embodiment 3 is obtained, the steady quality of sheet material, percent defective is 1.3%, and internal bond strength improves 25%, and cured layer thickness is 0.6mm, and the time of hot pressing is compared traditional heat pressing process and shortens 32s.
Claims (4)
1. a heat pressing process for medium density fibre board (MDF), comprises that hot press closes, the operation of hot-press gluing and unlatching press, and it is characterized in that, concrete steps are as follows:
1. described hot press opens shelves to full-size, after slab loads and puts in place on hot press, opens hot press;
2. described hot press rapid pressure in 2 ~ 10s also applies the pressure of 165 ~ 175MPa gradually to slab, and when the top board being pressurized to hot press is closed to distance slab 0.6 ~ 6mm, stop pressurization, pressurize 28 ~ 32s, now the first hot press period completes;
3. described hot press starts again, and in 5 ~ 20s, reduction of blood pressure in high-speed also unloads gradually and is depressed into 2.5 ~ 3.0MPa, and stop release, pressurize 80 ~ 100s, now the second hot press period completes;
4. described hot press starts again, and rapid pressure in 2 ~ 10s also gradually to the pressure of slab applying 6 ~ 10MPa, now stops pressurization, and pressurize 50 ~ 70s Post RDBMS voltage stabilizing process completes i.e. the 3rd hot press period and completes;
5. described hot press unloads gradually and presses off shelves in 2 ~ 100s, until hot press open grade size restoration to maximum open grade size time, release completes taking-up sheet material.
2. the heat pressing process of a kind of medium density fibre board (MDF) according to claim 1, is characterized in that: controlling at 168-175 DEG C in the hot pressing temperature of whole hot press period of described hot press.
3. the heat pressing process of a kind of medium density fibre board (MDF) according to claim 1, is characterized in that: before hot pressing, the moisture control of slab is 9 ~ 10%, and resin added controls at 168 ~ 172kg/m
3.
4. the heat pressing process of a kind of medium density fibre board (MDF) according to claim 1, is characterized in that: described hot press is 170MPa at the first hot press period to the pressure of slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410701175.5A CN104339435A (en) | 2014-11-28 | 2014-11-28 | Hot pressing process for medium density fiberboards |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410701175.5A CN104339435A (en) | 2014-11-28 | 2014-11-28 | Hot pressing process for medium density fiberboards |
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| CN104339435A true CN104339435A (en) | 2015-02-11 |
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| CN201410701175.5A Pending CN104339435A (en) | 2014-11-28 | 2014-11-28 | Hot pressing process for medium density fiberboards |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105235048A (en) * | 2015-09-25 | 2016-01-13 | 华南农业大学 | High-performance wood composite material and preparation method and application thereof |
| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN106607975A (en) * | 2017-03-09 | 2017-05-03 | 江西省崇义华森竹业有限公司 | Cold press molding production process of heavy bamboo blank plate |
| CN108818874A (en) * | 2018-07-06 | 2018-11-16 | 临沂市兰山区联拓板材厂 | A kind of sandwich body of fire prevention prepared using melamine impregnated paper |
| CN109825950A (en) * | 2019-02-19 | 2019-05-31 | 福建省正士工贸有限公司 | A kind of natural fiber and chemical fibre are mixed with cloth material method |
| CN111993525A (en) * | 2020-09-01 | 2020-11-27 | 广西壮族自治区林业科学研究院 | Preparation method of light-weight shaving board |
| CN115416358A (en) * | 2022-08-24 | 2022-12-02 | 山东英乐威装备科技有限公司 | Pressing process for silicon carbide reaction plate |
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| CN102126241A (en) * | 2010-12-27 | 2011-07-20 | 山东贺友集团有限公司 | Hot press process for high-density fiberboard over 12mm |
| CN102758384A (en) * | 2012-05-24 | 2012-10-31 | 湖北工业大学 | Fabricating method of formaldehyde-free wheat straw medium density fiberboard |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105235048A (en) * | 2015-09-25 | 2016-01-13 | 华南农业大学 | High-performance wood composite material and preparation method and application thereof |
| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN106607975A (en) * | 2017-03-09 | 2017-05-03 | 江西省崇义华森竹业有限公司 | Cold press molding production process of heavy bamboo blank plate |
| CN108818874A (en) * | 2018-07-06 | 2018-11-16 | 临沂市兰山区联拓板材厂 | A kind of sandwich body of fire prevention prepared using melamine impregnated paper |
| CN108818874B (en) * | 2018-07-06 | 2021-07-06 | 临沂市兰山区联拓板材厂 | Fireproof sandwich body prepared by utilizing melamine impregnated paper |
| CN109825950A (en) * | 2019-02-19 | 2019-05-31 | 福建省正士工贸有限公司 | A kind of natural fiber and chemical fibre are mixed with cloth material method |
| CN111993525A (en) * | 2020-09-01 | 2020-11-27 | 广西壮族自治区林业科学研究院 | Preparation method of light-weight shaving board |
| CN111993525B (en) * | 2020-09-01 | 2022-03-11 | 广西壮族自治区林业科学研究院 | Preparation method of light-weight shaving board |
| CN115416358A (en) * | 2022-08-24 | 2022-12-02 | 山东英乐威装备科技有限公司 | Pressing process for silicon carbide reaction plate |
| CN115416358B (en) * | 2022-08-24 | 2024-05-28 | 山东英乐威装备科技有限公司 | Lamination process for silicon carbide reaction plate |
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Application publication date: 20150211 |
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