CN115008559A - Process method for hot-pressing high-water-content plywood - Google Patents
Process method for hot-pressing high-water-content plywood Download PDFInfo
- Publication number
- CN115008559A CN115008559A CN202210745355.8A CN202210745355A CN115008559A CN 115008559 A CN115008559 A CN 115008559A CN 202210745355 A CN202210745355 A CN 202210745355A CN 115008559 A CN115008559 A CN 115008559A
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- hot
- hot press
- pressure
- plywood
- pressing
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Links
- 238000007731 hot pressing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000011120 plywood Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 4
- 238000004026 adhesive bonding Methods 0.000 description 7
- 239000002023 wood Substances 0.000 description 6
- 239000003292 glue Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Classifications
-
- 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
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention belongs to the technical field of hot pressing processes of plywood, and particularly relates to a process method for hot pressing of plywood with high water content, which comprises the following steps: s1, pressurizing stage: pressurizing to 13-20Mpa in 10s by the hot press, wherein the temperature of a hot pressing plate is 100-; s2, high-pressure stage: the hot press is kept at 13-20Mpa for hot pressing, the temperature is kept unchanged as a whole, and the hot press occupies one third of the total hot press time; s3, low-pressure maintaining stage: the hot press gradually reduces the pressure to 5-8Mpa, the temperature is kept unchanged, the pressure of the hot press is kept unchanged, and the pressure of the hot press accounts for one third of the total hot pressing time; s4, low-pressure moisture removal stage: and reducing the total pressure of the hot press to 0.1-2Mpa, keeping the temperature and the pressure of the hot press constant, wherein the pressure of the hot press accounts for one third of the total hot pressing time, starting the hot press within 1s, keeping the pressure at 0Mpa, and taking the plate. The invention eliminates the processing procedure of the veneer by manufacturers, reduces the production cost and greatly improves the production efficiency of the plywood.
Description
Technical Field
The invention relates to the technical field of plywood hot pressing processes, in particular to a process method for hot pressing plywood with high water content.
Background
Plywood, also called plywood, multi-layer material is the first invented artificial board. The wood grain adhesive is coated between the wood chips, and is formed by vertically laminating two adjacent layers of single wood grains and pressing the laminated wood grains at a certain temperature and under a certain pressure.
In the production process of the board, because the water content of the purchased veneer is too high, a manufacturer needs to dry the veneer and use the veneer in a short time, the production time is greatly prolonged, the secondary processing cost is increased, and the defect that the product percent of pass is low frequently appears in the manufacturer due to insufficient control on glue, the physical characteristics of wood and temperature and pressure in the traditional hot pressing stage of the veneer.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the plywood hot-pressing process which can directly produce the veneers without secondary processing treatment, ensure the yield of the plates and improve the production efficiency of a factory, and solves the problem of low plate gluing hot-pressing processing efficiency caused by the need of drying the veneers in advance.
(II) technical scheme
The invention specifically adopts the following technical scheme for realizing the purpose:
a process method for hot-pressing plywood with high water content comprises the following steps:
s1, pressurizing stage: pressurizing to 13-20Mpa by the hot press within 10s, controlling the temperature of a hot pressing plate to be 100-180 ℃, and starting the pressurization of the hot press in a pressurizing stage without calculating the total hot pressing time;
s2, high-pressure stage: the hot press is kept at 13-20Mpa for hot pressing, the temperature is kept unchanged as a whole, and the hot press occupies one third of the total hot press time;
s3, low-pressure maintaining stage: the hot press gradually reduces the pressure to 5-8Mpa, the temperature is kept unchanged, the pressure of the hot press is kept unchanged, and the stage accounts for one third of the total hot pressing time;
s4, low-pressure moisture removal stage: and reducing the total pressure of the hot press to 0.1-2Mpa, keeping the temperature and the pressure of the hot press constant, wherein the pressure of the hot press accounts for one third of the total hot pressing time, starting the hot press within 1s, keeping the pressure at 0Mpa, and taking the plate.
Further, the total hot pressing time of the plywood is plate thickness (1.0-2.2) min, wherein the plywood thickness is millimeter.
Furthermore, the hot press is a multilayer hot press which is normally produced and used in a factory, so that the temperature around the hot press plate is uniform, and the pressure of the oil hydraulic cylinder is sufficient.
Further, the hot press is a plc control system unit, and the hot pressing pressure, the hot pressing time and the hot pressing temperature are controlled by a control and calculation system beside the hot press.
Further, the water content of the plywood can be 0-40%, when the water content is larger than 15%, the hot pressing time is correspondingly increased according to the actual situation, and the hot pressing time is longer when the water content is larger.
(III) advantageous effects
Compared with the prior art, the invention provides a process method for hot-pressing the plywood with high water content, which has the following beneficial effects:
compared with the traditional hot pressing process, the invention eliminates the treatment process of a manufacturer on the veneer, improves the production efficiency, reduces the heat energy loss and the investment cost of the oven chamber, has high qualification rate of the hot-pressed veneer, does not have the conditions of plate explosion, surface bulge and the like, greatly improves the production efficiency of the veneer, and reduces the production cost.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
For further illustration of the objects, aspects and advantages of the present invention, the following description is provided with reference to specific embodiments. The specific process comprises the following steps:
uniformly roll-coating the glue on the veneer according to the glue application amount of 150 plus 250 g/square meter, wherein the water content of the veneer is between 0 and 35 percent, and no additional process treatment is needed. The method comprises the following steps of (1) carrying out conventional processes of an artificial board factory: gluing, splicing, cold pressing and hot pressing.
Example 1: 9mm, 5 layers of plywood.
And (3) feeding the board with the size of 1220cm by 2440cm into a hot press, wherein the water content of the single board before gluing is 10%.
Step 1: sending the plate into a hot press, starting a plc program, controlling the temperature of the hot press at 100-130 ℃, closing the hot press within 10s, and increasing the pressure to 13-20 Mpa;
step 2: the hot press keeps 13-20Mpa to pressurize, the temperature keeps unchanged, the high pressure time: 3 min;
and step 3: the hot press starts to release pressure to 5-8Mpa, the temperature is unchanged, and the low-pressure time is as follows: 5 min;
and 4, step 4: the hot press carries out pressure relief and moisture removal, the pressure is reduced to 0.1-2Mpa, the temperature is kept unchanged, and the moisture removal time is as follows: 1 min;
and 5: and opening the hot pressing plate by the hot press, and taking out the plate.
Example 2: 9mm, 5 layers of plywood.
And (3) feeding the board with the size of 1220cm by 2440cm into a hot press, wherein the water content of the single board before gluing is 20%.
Step 1: feeding the board into a hot press, starting a plc program, controlling the temperature of the hot press at 100-;
step 2: the hot press is kept at 13-18Mpa for pressurization, the temperature is kept unchanged, and the high-pressure time is as follows: 3 min;
and step 3: the hot press starts to release pressure to 4-7Mpa, the temperature is unchanged, and the low-pressure time is as follows: 6 min;
and 4, step 4: the hot press carries out pressure relief and moisture removal, the pressure is reduced to 0.1-3Mpa, the temperature is kept unchanged, and the moisture removal time is as follows: 4 min;
and 5: and opening the hot pressing plate by the hot press, and taking out the plate.
Example 3: 9mm, 5 layers of plywood.
And (3) feeding the board with the size of 1220cm by 2440cm into a hot press, wherein the water content of the single board before gluing is 30%.
Step 1: feeding the board into a hot press, starting a plc program, controlling the temperature of the hot press at 100-;
step 2: the hot press keeps 15-18Mpa to pressurize, the temperature keeps unchanged, the high pressure time: 3 min;
and step 3: the hot press starts to release pressure to 5-8Mpa, the temperature is unchanged, and the low-pressure time is as follows: 5 min;
and 4, step 4: the hot press carries out pressure relief and moisture removal, the pressure is reduced to 0.1-2Mpa, the temperature is kept unchanged, and the moisture removal time is as follows: 7 min;
and 5: and opening the hot pressing plate by the hot press, and taking out the plate.
Example 4: 9mm, 5 layers of plywood.
And (3) feeding the board with the size of 1220cm by 2440cm into a hot press, wherein the water content of the single board before gluing is 40%.
Step 1: feeding the board into a hot press, starting a plc program, controlling the temperature of the hot press at 160 ℃ below zero, closing the hot press within 10s, and increasing the pressure to 13-20 Mpa;
step 2: the hot press keeps 13-18Mpa to pressurize, the temperature keeps unchanged, the high pressure time: 3 min;
and step 3: the hot press starts to release pressure to 4-7Mpa, the temperature is unchanged, and the low-pressure time is as follows: 4 min;
and 4, step 4: the hot press carries out pressure relief and moisture removal, the pressure is reduced to 0.1-3Mpa, the temperature is kept unchanged, and the moisture removal time is as follows: 10 min;
and 5: and opening the hot pressing plate by the hot press, and taking out the plate.
The plywood sheets produced in examples 1, 2, 3 and 4 were subjected to property measurements with the property parameters given in the following table:
wherein, the standard of the qualified plate is as follows: when the plate is hot-pressed and taken out, whether the plate is exploded or not and whether the surface of the plate is bulged or not are judged, and when the plate is cooled completely, a wood hammer is used for beating the plate, so that whether the sound is dry and crisp or not is judged.
The gluing strength in the table is determined according to the requirements of the method of the national standard GB/T17657-2013.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A process method for hot-pressing plywood with high water content is characterized by comprising the following steps:
s1, pressurizing stage: pressurizing to 13-20Mpa in 10s by the hot press, wherein the temperature of a hot pressing plate is 100-;
s2, high-pressure stage: the hot press is kept at 13-20Mpa for hot pressing, the temperature is kept unchanged as a whole, and the hot press occupies one third of the total hot press time;
s3, low-pressure maintaining stage: the hot press gradually reduces the pressure to 5-8Mpa, the temperature is kept unchanged, the pressure of the hot press is kept unchanged, and the pressure of the hot press accounts for one third of the total hot pressing time;
s4, low-pressure moisture removal stage: and reducing the total pressure of the hot press to 0.1-2Mpa, keeping the temperature and the pressure of the hot press constant, wherein the pressure of the hot press accounts for one third of the total hot pressing time, starting the hot press within 1s, keeping the pressure at 0Mpa, and taking the plate.
2. The process method for hot-pressing the plywood with the high water content according to claim 1, wherein the process method comprises the following steps: the total hot pressing time of the plywood is plate thickness (1.0-2.2) min, wherein the plywood thickness is millimeter.
3. The process method for hot-pressing the plywood with the high water content according to claim 1, wherein the process method comprises the following steps: the hot press is a multilayer hot press which is normally produced and used in a factory, the temperature around the hot press plate is uniform, and the pressure of the oil hydraulic cylinder is sufficient.
4. The process method for hot-pressing the plywood with the high water content according to claim 1, wherein the process method comprises the following steps: the hot press is a plc control system unit, and the hot pressing pressure, the hot pressing time and the temperature are controlled by a control and calculation system beside the hot press.
5. The process method for hot-pressing the plywood with the high water content according to claim 1, wherein the process method comprises the following steps: the water content of the plywood can be 0-40%, when the water content is more than 15%, the hot pressing time is correspondingly increased according to the actual situation, and the hot pressing time is longer when the water content is larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745355.8A CN115008559A (en) | 2022-06-27 | 2022-06-27 | Process method for hot-pressing high-water-content plywood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745355.8A CN115008559A (en) | 2022-06-27 | 2022-06-27 | Process method for hot-pressing high-water-content plywood |
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|---|---|
| CN115008559A true CN115008559A (en) | 2022-09-06 |
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| CN202210745355.8A Pending CN115008559A (en) | 2022-06-27 | 2022-06-27 | Process method for hot-pressing high-water-content plywood |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101214678A (en) * | 2007-12-27 | 2008-07-09 | 张胜先 | Method for producing bamboo fibre artificial board without glue glued adhesion |
| CN101214666A (en) * | 2008-01-14 | 2008-07-09 | 南京林业大学 | Skid-proof container floor and manufacturing method thereof |
| CN101259631A (en) * | 2008-04-18 | 2008-09-10 | 杭州大庄地板有限公司 | Bamboo recombination sectional material and manufacturing method thereof |
| CN101434079A (en) * | 2008-12-18 | 2009-05-20 | 延锋伟世通（重庆）汽车饰件系统有限公司 | Secondary baking and heat pressing technique of heat pressing hemp fibre board for vehicle inner decoration |
| CN101607782A (en) * | 2009-07-10 | 2009-12-23 | 黑旋风工程机械开发有限公司 | A kind of fast dewatering method of waste jet grouting cement paste and equipment thereof |
| CN108081405A (en) * | 2017-11-24 | 2018-05-29 | 南宁科天水性科技有限责任公司 | A kind of hot pressing humidity discharging method of glued board and core-board |
| CN110524646A (en) * | 2019-09-27 | 2019-12-03 | 新田县永顺木器制品有限责任公司 | A kind of plywood hot-pressing technique |
-
2022
- 2022-06-27 CN CN202210745355.8A patent/CN115008559A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101214678A (en) * | 2007-12-27 | 2008-07-09 | 张胜先 | Method for producing bamboo fibre artificial board without glue glued adhesion |
| CN101214666A (en) * | 2008-01-14 | 2008-07-09 | 南京林业大学 | Skid-proof container floor and manufacturing method thereof |
| CN101259631A (en) * | 2008-04-18 | 2008-09-10 | 杭州大庄地板有限公司 | Bamboo recombination sectional material and manufacturing method thereof |
| CN101434079A (en) * | 2008-12-18 | 2009-05-20 | 延锋伟世通（重庆）汽车饰件系统有限公司 | Secondary baking and heat pressing technique of heat pressing hemp fibre board for vehicle inner decoration |
| CN101607782A (en) * | 2009-07-10 | 2009-12-23 | 黑旋风工程机械开发有限公司 | A kind of fast dewatering method of waste jet grouting cement paste and equipment thereof |
| CN108081405A (en) * | 2017-11-24 | 2018-05-29 | 南宁科天水性科技有限责任公司 | A kind of hot pressing humidity discharging method of glued board and core-board |
| CN110524646A (en) * | 2019-09-27 | 2019-12-03 | 新田县永顺木器制品有限责任公司 | A kind of plywood hot-pressing technique |
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Application publication date: 20220906 |
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