CN101367217B - Heat pressing novel method for manufacturing wood veneer/laminated veneer lumber - Google Patents
Heat pressing novel method for manufacturing wood veneer/laminated veneer lumber Download PDFInfo
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- CN101367217B CN101367217B CN2007100261707A CN200710026170A CN101367217B CN 101367217 B CN101367217 B CN 101367217B CN 2007100261707 A CN2007100261707 A CN 2007100261707A CN 200710026170 A CN200710026170 A CN 200710026170A CN 101367217 B CN101367217 B CN 101367217B
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Abstract
The present invention provides a hot pressing method for producing a veneer/laminated veneer lumber so as to solve the problems of long period, low wood utilization rate, uneven thickness of products, great compression loss, easy bubbling, variation of heat-pressing process along with tree species, veneer density and water ratio and the like, existing in the prior hot pressing process. In the method, pressure control and thickness control simultaneously act on a hot pressing period, and the first phase of hot pressing is controlled by constant pressure which is 0.1 to 1.0Mpa higher than the prior hot pressing pressure so as to accelerate heat transfer and plate blank compression; when the plate achieves the target thickness, the system automatically enters the second phase, namely the thickness control phase, herein the thickness of the plate whose control is in hot pressing does not change, but the hot pressing pressure automatically drops; and when a glue film in the center of the plate reaches the temperature of solidification, the system enters pressure relief phase. The method can effectively improve the evenness of the plate thickness and the utilization rate of wood, shorten hot pressing period, improve the production efficiency of a hot press, ensure product quality, simplify the operation of the hot press, and improve the stability of hot pressing process.
Description
Technical field
The present invention relates to the hot-press method of a kind of manufacturing glued board and laminated veneer lumber (LVL), belong to wood-based plate manufacturing and automatic field.
Background technology
Hot pressing is one of operation most important and the most expensive in the Wood-based Panel Production.Present non-Monoplacophora composite adopts the heat pressing process of thickness (or position) control as oriented wood chipboard (OSB) and medium density fibre board (MDF) (MDF); And Monoplacophora composite such as glued board and laminated veneer lumber (LVL) conventional hot-press adopts the heat pressing process of relatively low constant pressure control usually.When adopting product such as this conventional hot-press method compacting glued board, hot pressing time length depends primarily on the speed that the slab central core is warming up to the adhesive curing temperature, and the optimal heat pressure pressure depends primarily on the uniformity of seeds, thickness of slab, veneer density and moisture content, therefore not only hot pressing time is long for this conventional hot-press method, and have that thickness of slab is irregular, the sheet material compression excessively or the remarkable problems such as loss and the easy bubbling of product of thickness, this is extremely unfavorable for effective raising timber utilization rate and factory economy benefit.For overcoming the conventional hot-press method above shortcomings that adopted in present glued board and the laminated veneer lumber production, invent this hot-press method.
Summary of the invention
The present invention controls two kinds of hot pressing modes-pressure and thickness (or position) control technology is combined in the middle of the pressing cycle.In the phase I, adopt pressure to compress slab usually than the high 0.1-1.0MPa of conventional hot-press pressure.Under this pressure effect, the roughness by overcoming the veneer surface fast is to obtain the tight contact between the veneer; Because heat and moisture reduce slab thickness rapidly to the synergy softening and creep of timber.In case sheet metal thickness reaches target, the automatic primer fluid compressing cylinder of second stage is kept the pressing plate position.In this stage, the slab internal temperature continue to rise so that adhesive curing, and simultaneously warm and humid synergy softening and stress relaxation causes hot pressing pressure to descend automatically, and the sheet material internal stress is also descended, and this helps to form enough bonding strengths.Compare the phase I, the permeability of sheet material is constant substantially, and this helps internal gas discharges, and forms bubbling when avoiding press to open.In case the temperature of plank thickness direction center glue-line reaches solidification temperature, the release stage begins.Because this moment, hot pressing pressure was lower, this stage also can correspondingly shorten, up to finishing whole hot pressing.
Beneficial effect
The present invention can use on production line, can effectively improve timber utilization rate, shortens hot pressing time, guarantees product quality, improve the factory economy benefit.
Compare with the conventional hot-press method of constant pressure control, this hot-press method reduces greatly to the sensitiveness of seeds, veneer thickness, moisture content and density variability, and the thickness of slab of acquisition accurately and has evenly been simplified the hot press operation of factory greatly.Because thickness deviation reduces between plate, can reduce Veneer Cutting thickness, reduce and satisfy the target thickness of slab that current standard requires, improve stock utilization.Because heat can be delivered to the veneer and the glue-line of internal layer fast from pressing plate, hot pressing time can shorten relatively, and press output can correspondingly improve; Simultaneously in the hot pressing later stage because hot pressing pressure reduces, and sheet metal thickness and permeability and do not become, and bubbling can farthest be controlled, buck stage also can correspondingly shorten, thereby has further shortened hot pressing time, improves the production efficiency of hot press.Evidence, this hot-press method can shorten hot pressing time 5-15% than conventional hot-press method, for enterprise creates considerable economic.
Description of drawings
The non-single board quasi-artificial board conventional hot-press of Fig. 1 method
Adopt thickness (or position) control heat pressing process, owing to cause pressure sharply to increase in the hot press closing course usually, pressure can cause wood cell wall fold and/or destruction by height.Hydraulic jack pressure that such material hot pressing is had relatively high expectations usually and expensive press.
Fig. 2 single board quasi-artificial board conventional hot-press method
The heat pressing process that glued board and laminated veneer lumber usually adopt relatively low pressure to carry out constant voltage control, this method be easy to carry out and the hot press structure simple relatively.
This hot-press method of Fig. 3 heat pressing process control schematic diagram
This hot-press method is controlled pressure and thickness (or position) control mode is combined in the middle of the pressing cycle.In the phase I, adopt usually and compress slab, be i.e. pressure control mode than the high pressure of the high 0.1-1.0MPa of the used pressure of conventional hot-press; Second stage is sheet metal thickness (or pressing plate position) control model, in case thickness direction center glue-line reaches the adhesive curing temperature, promptly enters buck stage.
This hot-press method of Fig. 4 is applied to the suitability for industrialized production hot pressing curve
To single drylight presses, use the phase I that maximum pressure that factory's press can improve carries out constant voltage control usually, decide according to seeds, veneer, moisture content, thickness and hot pressing pressure this pressing time in stage; Second stage is after the sheet material target thickness reaches, and the automatic primer fluid compressing cylinder of system enters thickness (or pressing plate position) control model, in case thickness direction center glue-line reaches solidification temperature, promptly enters and unloads buck stage.To multidaylight press, the position that compressing control unit is controlled pressing plate should be installed, other operations are identical with single drylight presses.
The specific embodiment
Example 1: length and width are 83.8cm * five layers of glued board of 61.0cm pine, nominal thickness 15.5mm;
● veneer is prepared: peeling thickness is 3.175mm, and average moisture content is 3.5%, 5.5%;
● glue kind and resin added: phenolic resin glue (PF), single face resin added 157g/m
2
● press: breadth is 91cm * 91cm single-layer hot press;
◆ common process (hot pressing control curve such as accompanying drawing 2): hot pressing pressure 1.31MPa, 155 ℃ of hot pressing temperatures;
◆ the technology of this hot-press method correspondence (hot pressing control curve is as shown in Figure 3): hot pressing pressure
Exceed conventional hot-press 0.3-0.8MPa respectively according to veneer moisture content difference, 155 ℃ of hot pressing temperatures;
To two kinds of technologies, when being 110 ℃, sheet metal thickness direction bosom glue-line temperature begins release, and the time is 30 seconds;
● sheet material is handled: ageing is cutting sample mensuration bonding strength and bending strength after 48 hours;
● interpretation of result
◆ compare with the conventional hot-press method, this pressure sintering is that moisture content is 3.5% and 5.5% o'clock at veneer, and average hot pressing time reduces 15.5% and 9.5% respectively, and the plank thickness evenness significantly improves, and sheet material gummed and bending property are had no adverse effect.
Example 2: length and width are 13 layers of pine veneer laminated timber of 83.8cm * 61.0cm, sheet material nominal thickness 38.0mm;
● veneer is prepared: peeling thickness is 3.175mm, and average moisture content is 3.5%, 5.5%, 9.0%;
● glue kind and resin added: phenolic resin glue (PF), single face resin added 171g/m
2
● press: breadth is 91cm * 91cm single-layer hot press;
◆ common process (hot pressing control curve such as accompanying drawing 2): hot pressing pressure 1.31MPa, 155 ℃ of hot pressing temperatures;
◆ the technology of this hot-press method correspondence (hot pressing control curve such as accompanying drawing 3): hot pressing pressure exceeds conventional hot-press 0.3-0.8MPa respectively according to veneer moisture content difference, 155 ℃ of hot pressing temperatures;
To two kinds of technologies, when being 105 ℃, sheet metal thickness direction bosom glue-line temperature begins release, and the time is 60 seconds;
● sheet material is handled: ageing is cutting sample mensuration bonding strength, bending strength and shear strength after 48 hours;
● interpretation of result
◆ compare with the conventional hot-press method, this pressure sintering is that moisture content is 3.5%, 5.5% and 9.0% o'clock at veneer, average hot pressing time shortens 5.0%, 6.4% and 6.5% respectively, the plank thickness evenness significantly improves, adopt this hot-press method art plate target thickness to realize easily, resilience only is 0.3-1.2% after the hot pressing.Use two kinds of its bending properties of method pressed sheet and shear strength and do not have significant difference.
Example 3: length and width are five layers of pine glued board of 1220mm * 2440mm, nominal thickness 15.5mm;
● veneer is prepared: thickness 3.338mm, moisture content are 3%;
● glue kind and resin added: phenolic resin glue (PF), single face resin added 157g/m
2
● precompressed: 3 minutes
● press: 40 layers of periodic multi-daylight press (the sheet material compressing control unit is installed on this press);
◆ common process (hot pressing control curve such as accompanying drawing 2): suppress 40 altogether, hot pressing pressure 1.31MPa, hot pressing time 285 seconds, 140.5 ℃ of hot pressing temperatures;
◆ the technology of this hot-press method correspondence: suppress 40 altogether, hot pressing pressure 1.45MPa (limited by this factory's hydraulic system of press, pressure only exceeds conventional hot-press 0.14MPa), 240 seconds constant voltage dwell times, total 275 seconds hot pressing time, 140.5 ℃ of hot pressing temperatures, hot pressing control curve is as shown in Figure 4.
● sheet material is handled: ageing is cutting sample mensuration bonding strength and bending strength after 48 hours;
● interpretation of result
◆ compare with the common process pressed sheet, thickness deviation is identical with the conventional method pressed sheet in the technology pressed sheet of this hot-press method correspondence, its plate; But deviation ratio conventional method pressed sheet reaches 30% for a short time between its plate; Both static bending modulus and intensity, shear strength, wood-breaking rate do not have marked difference; But the technology hot pressing time ratio common process of this hot-press method correspondence shortens 3.5%; If press can provide more high pressure, hot pressing time then can shorten 5-15%;
◆ economic benefit: (annual production is 8.8 ten thousand m to this family's plant layout of carrying out industrial experimentation
3), adopting the technology pressed sheet of this hot-press method correspondence, conservative estimation production capacity can promote 3%, and factory can increase by 300,000 dollars of profits every year; Sheet material compression losses reduction 1.5-3.0% (with thickness of slab 9.5mm, every 93m
2The veneer cost is 125 dollars and is benchmark calculating), then can save 150 at least every year, 000-450,000 dollar; Bubbling and layering reduce also can bring economic benefit; Therefore, the plywood factory of this scale can save 450,000 dollars every year at least.
Claims (2)
1. hot-press method of making wood veneer/laminated veneer lumber, it is characterized in that: two kinds of hot pressing modes-pressure control and THICKNESS CONTROL technology are acted on a pressing cycle simultaneously, promptly adopt constant pressure control technology earlier, use THICKNESS CONTROL technology again, finish hot press working in conjunction with the characteristic of veneer in hot pressing, wherein, the constant pressure control stage is the hot pressing phase I, and the THICKNESS CONTROL stage is the hot pressing second stage; In the hot pressing phase I, adopt and compress slab than the constant pressure of the high 0.1-1.0MPa of wood veneer/laminated veneer lumber conventional hot-press pressure, make to form closely contact between the veneer fast, under creep and warm and humid emollescence, reach target thickness up to sheet material fast; After the sheet material target thickness reaches, the phase I-the constant pressure control stage finishes, thus the automatic primer fluid compressing cylinder of system is kept pressing plate position or compressing control unit and is kept the pressing plate position and enter hot pressing second stage-THICKNESS CONTROL stage; In the hot pressing second stage, sheet metal thickness immobilizes, and descends automatically but the hot pressing pressure stress is lax.
2. hot-press method according to claim 1 is characterized in that: after the temperature of sheet metal thickness direction center glue-line reached predetermined solidification temperature, the release stage was up to finishing whole hot pressing fast.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100261707A CN101367217B (en) | 2007-08-17 | 2007-08-17 | Heat pressing novel method for manufacturing wood veneer/laminated veneer lumber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100261707A CN101367217B (en) | 2007-08-17 | 2007-08-17 | Heat pressing novel method for manufacturing wood veneer/laminated veneer lumber |
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| CN101367217A CN101367217A (en) | 2009-02-18 |
| CN101367217B true CN101367217B (en) | 2011-12-14 |
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| CN2007100261707A Expired - Fee Related CN101367217B (en) | 2007-08-17 | 2007-08-17 | Heat pressing novel method for manufacturing wood veneer/laminated veneer lumber |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107363922A (en) * | 2017-06-29 | 2017-11-21 | 广西防城港市昌海木业有限公司 | A kind of technique of glued board slab hot pressing |
| CN108214729B (en) * | 2018-01-23 | 2020-08-28 | 南京林业大学 | Surface layer enhanced plywood and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133769A (en) * | 1995-04-19 | 1996-10-23 | 王宝库 | Method for mfg. large shaving board or plywood coating face |
| CN2792736Y (en) * | 2005-04-25 | 2006-07-05 | 上海人造板机器厂有限公司 | Artificial plate slab thickness controller |
| CN1824477A (en) * | 2005-02-23 | 2006-08-30 | 华硕电脑股份有限公司 | Composite material veneer containing carbon fiber weaving cloth and its preparation method |
-
2007
- 2007-08-17 CN CN2007100261707A patent/CN101367217B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133769A (en) * | 1995-04-19 | 1996-10-23 | 王宝库 | Method for mfg. large shaving board or plywood coating face |
| CN1824477A (en) * | 2005-02-23 | 2006-08-30 | 华硕电脑股份有限公司 | Composite material veneer containing carbon fiber weaving cloth and its preparation method |
| CN2792736Y (en) * | 2005-04-25 | 2006-07-05 | 上海人造板机器厂有限公司 | Artificial plate slab thickness controller |
Non-Patent Citations (2)
| Title |
|---|
| 林利民，武广明，朱忠明，张志刚.国产木材集装箱底板用胶合板生产工艺技术.建筑人造板2001年 第2期.2001,2001年(第2期),29-31. |
| 林利民,武广明,朱忠明,张志刚.国产木材集装箱底板用胶合板生产工艺技术.建筑人造板2001年 第2期.2001,2001年(第2期),29-31. * |
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