CN108214729A - A kind of enhanced glued board in surface layer and preparation method - Google Patents

A kind of enhanced glued board in surface layer and preparation method Download PDF

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Publication number
CN108214729A
CN108214729A CN201810064452.4A CN201810064452A CN108214729A CN 108214729 A CN108214729 A CN 108214729A CN 201810064452 A CN201810064452 A CN 201810064452A CN 108214729 A CN108214729 A CN 108214729A
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China
Prior art keywords
veneer
wooden veneer
water
surface layer
glued board
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CN201810064452.4A
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CN108214729B (en
Inventor
詹天翼
张耀丽
张海洋
卢晓宁
丁涛
何倩
张小进
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Nanjing Forestry University
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Nanjing Forestry University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27DWORKING VENEER OR PLYWOOD
    • B27D1/00Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04Joining 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
    • B27D1/08Manufacture of shaped articles; Presses specially designed therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27DWORKING VENEER OR PLYWOOD
    • B27D5/00Other working of veneer or plywood specially adapted to veneer or plywood
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood

Abstract

The invention discloses a kind of enhanced glued board in surface layer and preparation methods, belong to wood materials production technical field.The present invention during glued board assembly, realizes that slab surface layer moisture content is high, core moisture content is low, it is ensured that the surface layer rigidity of slab is low before glue laminated, and core rigidity is high by regulating and controlling the moisture content of each layer Wooden veneer of glued board, particularly upper and lower two surface woods veneer;In autoclaving process, there is damp and hot ruckbildung in surface wood veneer, and then under pressure, the compression ratio of upper and lower two surface woods veneer is noticeably greater than the compression ratio of each layer Wooden veneer of core;By glued board made from the preparation method, surface layer density is significantly higher than core density, efficient, the enhanced glued board in surface layer at low cost and small Volume Loss simple for process and preparation method thereof.

Description

A kind of enhanced glued board in surface layer and preparation method
Technical field
The invention belongs to wood materials production technical field, specifically, being related to a kind of enhanced glued board in surface layer and system Preparation Method.
Background technology
Glued board is a kind of artificial board formed by Wooden veneer by the mutual assembly of adjacent layer grain direction, glue laminated.Glue Plywood remains the native texture and quality of timber, has many advantages, such as that even structure, to be not easy warpage, breadth big, can substitute reality Wooden class products application is in fields such as building, decoration, Furniture manufacture and packagings.The development of glued board using for alleviating timber with supplying Need contradiction, protecting forest resources has important practical significance.In order to widen the use field of glued board, it usually needs enhance it Mechanical property, such as intensity, rigidity and hardness.Common method is to carry out chemical modification increasing to forming the Wooden veneer of glued board It manages strength;Or place other reinforcing materials on the surface layer of glued board (or secondary surface layer).Pavlo Bekhta et al. (Effects of short-term thermomechanical densification on the structure and properties Of wood veneers, Wood Material Science and Engineering, 2017,12:40-54) report one The Enhancement Method of kind glued board carries out compression compact processing first to each layer veneer for forming glued board, later again will compression Enhanced glued board is made in veneer assembly afterwards and hot pressing.But this method needs to carry out hot pressing twice, reduces production efficiency; And each layer veneer is compressed, make glued board Volume Loss obtained larger.In addition, in patent " light weight high strength wood The manufacturing method of matter composite plywood plate and its structure (application number:201010017212.2 disclosure/notification number:CN 101716787A) " and " metal reinforced wood composite board and its processing method (application number:200910014240.6 disclosure/bulletin Number:CN 101811313A) " in, glass fiber laminates or basalt continuous fiber are added in glued board slab respectively, from And improve the integral strength of glued board;But the complex process of this method, and increase the cost of manufacture of glued board.
The prior art is all to realize the defects of overcoming bending, deformation and degumming by eliminating moisture gradient, such as specially Sharp application number 201110109359.9, open notification number CN 102229162A, discloses a kind of wood-based plate balance humidifying technology side Method:It is that wood-based plate is placed in balance dry kiln or dedicated balance damping, by adjusting kiln temperature and humidity, warp Heating humidification, balance damping and the balance conditioning for being aged health are crossed, the moisture content of effective uniformly wood-based plate eliminates moisture content Gradient and the residual stress for discharging timber, entire processing procedure are completed in -5 days 3 days, and the wood-based plate that makes that treated is subsequent No longer occur the defects of bending, deformation and degumming in production and processing, effectively increase the quality of manufactured goods, improve wood-based plate Service life, while also reduce and the consumption of timber but the invention are had the following disadvantages:Steam unit and wind turbine are needed to people Plate is made to carry out the pre-heat treatment and need the processing such as heating humidification, balance damping profit and ageing health, process processing procedure week Phase is longer and needs wood-based plate being put into kiln and handles, while needs the moisture content of balanced wood-based plate, eliminates moisture gradient To realize the defects of overcoming bending, deformation and degumming.
Number of patent application 201310029781.2, open notification number CN 103072159A, discloses with creep resistant deforming Prestressing force laminated wood of performance and its preparation method and application:It include the top compressive region along wooden frame short transverse, middle part by Cut area, bottom tensile region and gluing oxidant layer, the top compressive region, middle part by cut inside area and bottom tensile region and between floor Molding is mutually adhesively fixed by gluing oxidant layer in plate, it is described containing top compressive region, middle part by the glue for cutting area and bottom tensile region Wooden component is closed, the final moisture content of three part timber is identical, is 10%-12%;Its principle be laminated wood wooden frame tension, High stress hierarchical organization timber is configured in compressive region, and the timber along three parts of member height sets moisture gradient, different After moisture content timber reaches balance unanimously, since the dehydration drying shrinkage of timber and moisture expantion are suppressed, it is impossible to fully freely stretch Compression deformation and generate prestressing force, under action of long-term load the creep-resistant property of laminated wood wooden frame be improved significantly, and in structure Part preparation initial stage controls the intrinsic natural defect to affect the mechanical properties in timber, and product structure is stable and reliable for performance, just Degree is high, and creep-resistant property is excellent, can be used as plate for timber-construction load-bearing wooden frame.But the invention has the following disadvantages:By advance Moisture gradient and then disappearing to the progress later stage moisture gradient of timber are set in laminated wood wooden frame short transverse laminate It removes to enhance wooden frame, operationally brings complexity, production cost is high;Different range wood is carried out according to strength grade simultaneously The control of material moisture content, purpose it is final or in order to using moisture content gradient of wood generate prestressing force improve wooden deflection of beam, Deformation and degumming structural behaviour.
Number of patent application 201010614301.5, open notification number CN 102554992A, discloses a kind of Surface Enhanced Wood section bar and its manufacturing method;Enhancement layer and internal natural layer including general wood surface, the enhancement layer is described The surface of natural layer, the density of the enhancement layer are 1.3-3 times of the density of nature layer, and the moisture content of the enhancement layer is more natural The low 1-6% of layer, the thickness of the enhancement layer is 0.2-10mm.The enhancement layer is by being obtained after the surface hot pressing by natural layer 's;The surface enhanced type wood section bar of the invention can be used for manufacture solid wooden floor board, solid wood furniture or solid wooden compound floor panel, Timber, furniture panel;Operating procedure is complicated and also needs to be uniformly controlled the testing and debugging of water content and water content, is not suitable for large quantities of The wood single-plate drying of amount, is substantially still that traditional hot pressing leads to dense surface mode;Hot pressing temperature is excessively high, time mistake It is long, the density of wood surface can be had an impact, its superficial density is caused to be unevenly distributed, anti-bending strength is bad, and the later stage can go out Phenomena such as existing wood surface fracture or wood surface are detached with core.The setting of the moisture gradient of prior art phase behind Hot-pressing processing temperature is excessively high, generates destroying infection to the density of wood surface, cannot solve current face veneer mechanics instead The problem of performance is bad
Invention content
1st, it to solve the problems, such as
In being prepared for the enhanced glued board in existing surface layer there are face veneer mechanical property it is bad the problem of, the present invention A kind of efficient, enhanced glued board in surface layer at low cost and small Volume Loss simple for process and preparation method thereof is disclosed, is passed through Regulate and control the moisture content (particularly upper and lower two surface woods veneer) of each layer Wooden veneer of glued board, during glued board assembly, Realize that slab surface layer moisture content is high, core moisture content is low, it is ensured that the surface layer rigidity of slab is low before glue laminated, and core rigidity is high;In heat It presses in processing procedure, damp and hot ruckbildung, then under pressure, upper and lower two surface woods list occurs in surface wood veneer The compression ratio of plate is noticeably greater than the compression ratio of each layer Wooden veneer of core;Pass through glued board, surface layer made from the preparation method Density is significantly higher than core density, and with good intensity, rigidity and case hardness, and realizes and overcome bending, deformation and take off The defects of glue.2nd, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of preparation method of the enhanced glued board in surface layer, includes the following steps:
(1) Wooden veneer surface is subjected to water spray processing, high-moisture percentage Wooden veneer is made, the high-moisture percentage is 10%-30%;When glued board is prepared, the moisture content of every layer of veneer is the same the prior art;The present invention is by changing Become face ply moisture content, make it more compressible, can finally obtain the enhanced glued board in surface layer;
(2) processing is dried in odd number Wooden veneer, low-water-content Wooden veneer is made, the low-water-content is 5%-8%;
(3) by odd number Zhang Mu described made from high-moisture percentage Wooden veneer and step (2) described made from step (1) Matter veneer carries out both side surface gluing and then carries out assembly, and the technique of the assembly is as follows:The high-moisture percentage is wooden Veneer is arranged in parallel to form surface layer up and down mutually, and then the parallel height being placed in described in two of the low-water-content Wooden veneer contains The centre of water rate Wooden veneer and parallel with the high-moisture percentage Wooden veneer described in two and form core while adjacent described Low-water-content Wooden veneer between be mutually perpendicular to carry out to place according to texture the slab with moisture gradient be made;
(4) to the progress hot-pressing processing of the slab with moisture gradient obtained in step (3), after hot-pressing processing Release, cooling, cutting edge and sanding processing are carried out, the enhanced glued board in surface layer is made.
Preferably, the Wooden veneer described in step (1) and step (2) is rotary cut venner, sliced veneer or sawn veneer In one kind, water spray before density be not more than 0.5g/cm3.If Wooden veneer density is excessively high, surface layer High water cut can not be ensured The compression effectiveness of rate Wooden veneer.
Preferably, the water spray processing described in step (1), concrete operation step are as follows:Under the conditions of 20 DEG C -30 DEG C, away from It is alternately sprayed water with a distance from the Wooden veneer surface 10cm-50cm described in two to its surface using pneumatic water pistol, gas Nozzle inside diameter 3mm-10mm, the operating pressure 0.7MPa-0.8MPa of dynamic water pistol, water spray quality are the Wooden veneer over dry The 12%-32% of quality during state;After reaching scheduled water spray quality, pneumatic water pistol stops water spray and immediately by the wood Matter veneer places 20s-200s.The setting of water spray distance, nozzle inside diameter and pressure is in order to ensure liquid water atomization and can be equal It is even to be distributed in Wooden veneer surface;If technological parameter goes beyond the scope, it is impossible to ensure being uniformly distributed for water, can not realize the later stage Effect.
Preferably, the drying process described in step (2) carries out in drying box;Wherein drying temperature is 50 DEG C -70 DEG C, Drying time is 20min-60min.Drying process is in order to obtain the Wooden veneer that moisture content is 5%-8%, and temperature is too low Drying time can be made long, if temperature is excessively high, it is possible to the high temperature degradation of wood component or the damage of physical arrangement can be caused.
Preferably, the adhesive used during gluing described in step (3) for phenolic resin, consolidate by the phenolic resin Content is 30%-50%, and the molar ratio of formaldehyde and phenol in raw material for preparing of the phenolic resin is 2:1, sodium hydroxide matter 40% for phenol quality is measured, the glue-spread of the both side surface is 200g/m2-280g/m2
Preferably, the condition of the hot-pressing processing described in step (4) is:140 DEG C -160 DEG C of temperature, hot pressing time 50s/ Mm-65s/mm, the thickness of finger gauge are the 60%-80% of the thickness of the slab with moisture gradient.Hot-pressing processing Parameter Conditions not only to ensure being fully cured for adhesive, and according to the density of material, adhesive and moisture content The factors such as gradient, it is ensured that bending strength, Deflection Modulus of Elasticity and the case hardness of the enhanced glued board in surface layer improve, and other models Enclosing can not realize.
3rd, advantageous effect
Compared with the prior art, beneficial effects of the present invention are:
(1) raw materials for production of preparation method are only Wooden veneer, adhesive and water in the present invention, at low cost, and technique walks It is rapid simple, to the treatment effect highly significant of low-density timber, density is suitble to be less than 0.5g/cm3Timber processing;
(2) in the present invention preparation method only need to before assembly to the moisture content of surface wood veneer and core Wooden veneer into Row otherness adjusts, and only improves the moisture content of surface wood veneer, simple and convenient and water spray by spraying water under room temperature The condition of technique causes Wooden veneer to fully absorb moisture, does not need to addition chemical modifier;Core Wooden veneer drying simultaneously Processing is handled only with drying box, and the treatment process of entire surface layer Wooden veneer and core Wooden veneer is simple, production effect Rate is high;
(3) preparation method only carries out a hot pressing in the present invention and hot pressing temperature only needs control at 140 DEG C -160 DEG C, simultaneously Realize face ply compression compact and adhesive by heat cure;Wherein adhesive uses the phenolic aldehyde tree that special ratios are prepared Fat, and bonding of the glue-spread of phenolic resin between core Wooden veneer and between core Wooden veneer and face ply has Further facilitation;
(4) the enhanced glued board in surface layer obtained in the present invention, the compression ratio and density of surface layer plank are significantly higher than core Portion's plank during glued board assembly, realizes that slab surface layer moisture content is high, core moisture content is low, it is ensured that slab before glue laminated Surface layer rigidity is low, and core plank rigidity is high;In autoclaving process, the Wooden veneer on upper and lower two surface layer of slab by high temperature, Under the coupling of high-moisture, glass transition occurs for hemicellulose and lignin in chemical composition, makes surface wood list There is damp and hot ruckbildung in plate, so as to show as:Under pressure, the compression ratio of upper and lower two surface woods veneer is significantly big In the compression ratio of each layer Wooden veneer of core;
(5) the enhanced glued board in surface layer obtained has good intensity, rigidity and case hardness in the present invention, and common Glued board prepared by method is compared, bending strength, Deflection Modulus of Elasticity and the case hardness point of the enhanced glued board in this kind of surface layer It is indescribably high by 30%, 50% and more than 100%, realize bending, deformation and overcoming the defects of degumming;It can be applied to intensity requirement In higher timber or floor etc.;
(6) adjustment that pneumatic water pistol carries out moisture content is used (to limit temperature, water spray distance, nozzle inside diameter, work when spraying water Make pressure and standing time), the condition of temperature-time, the component content of adhesive, glue-spread and hot-pressing processing that is dried, Synergistic effect all is played to the surface enhanced of glued board, the glued board density for being particularly suitable for cannot be used for manufacture high intensity is less than 0.5g/cm3Timber processing.
Description of the drawings
The structural decomposition diagram of the enhanced glued board in surface layer that Fig. 1 is prepared for the present invention, 1- high-moisture percentage Wooden veneers, 2- low-water-content Wooden veneers;
Fig. 2 is the density profile of the enhanced glued board in surface layer prepared by the present invention and normal plywood in thickness direction.
Specific embodiment
The present invention is further described below with reference to specific embodiment.
Embodiment 1
A kind of preparation method of the enhanced glued board in surface layer, includes the following steps:
1) rotary-cut:Board using poplar board (the density 0.4g/cm that thickness is 1.8mm is made in rotary-cut3):Selection wherein 2 is wooden Veneer, at 25 DEG C, using pneumatic water pistol to two surface alternating water deliveries of every veneer, wooden described in distance two It is alternately sprayed water at the 10cm distances of veneer surface to its surface using pneumatic water pistol, the nozzle inside diameter 3mm of pneumatic water pistol, Operating pressure 0.7MPa displays 120s after 17% of water spray quality for over dry Wooden veneer quality, obtains whole moisture content and is 15% surface wood veneer;Other 5 Wooden veneers are chosen, dry 20min, is obtained in the drying box for being 70 DEG C in steady temperature Obtain the core Wooden veneer that whole moisture content is 6%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 200g/m2, it is 2 that the addition of formaldehyde and phenol, which is compared, in phenolic resin:1, sodium hydroxide quality is the 40% of phenol quality;Phenolic aldehyde tree The solid content of fat is 45%.
3) assembly:The technique of the assembly is as follows:Shape is arranged in parallel up and down mutually in the high-moisture percentage Wooden veneer Into surface layer, then the parallel centre for being placed in the high-moisture percentage Wooden veneer described in two of the low-water-content Wooden veneer and with High-moisture percentage Wooden veneer described in two is parallel and forms core, while between the adjacent low-water-content Wooden veneer It is mutually perpendicular to place according to texture that the slab with moisture gradient is made;By 7 Wooden veneers after gluing according to it is vertical- Horizontal-vertical mode (texture of timber) assembly, wherein the surface wood veneer that whole moisture content is 15% is placed in upper and lower two table of slab Face.
4) hot pressing:After slab is put into press, finger gauge of the difference placing height for 80mm, hot pressing temperature in slab both sides It is 140 DEG C, hot pressing time 50s/mm.
5) release:After reaching hot pressing time, hot pressing terminates, and pressure is gradually decrease to 0, takes out slab, 6 hours to be cooled Afterwards, cutting edge and sanding (being handled through 60 mesh sand paper), are made the enhanced glued board in surface layer.
Embodiment 2
A kind of preparation method of the enhanced glued board in surface layer, includes the following steps:
1) rotary-cut:Thickness is made in rotary-cut (can also use slicing or sawing), and for the board using poplar board of 1.8mm, (density is 0.3g/cm3):Wherein 2 Wooden veneers are chosen, at 30 DEG C, are replaced using pneumatic water pistol to two surfaces of every veneer Water spray is alternately sprayed its surface using pneumatic water pistol at the Wooden veneer surface 50cm distances described in distance two Water, the nozzle inside diameter 10mm of pneumatic water pistol, operating pressure 0.8MPa, until 32% of water quality for over dry Wooden veneer quality After display 150s, obtain the surface wood veneer that whole moisture content is 30%;Other 5 Wooden veneers are chosen, are in steady temperature Dry 60min in 60 DEG C of drying box obtains the core Wooden veneer that whole moisture content is 5%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 220g/m2, it is 2 that the addition of formaldehyde and phenol, which is compared, in phenolic resin:1, sodium hydroxide quality is the 40% of phenol quality;Phenolic aldehyde tree The solid content of fat is 45%.
3) assembly:The technique of the assembly is as follows:Shape is arranged in parallel up and down mutually in the high-moisture percentage Wooden veneer Into surface layer, then the parallel centre for being placed in the high-moisture percentage Wooden veneer described in two of the low-water-content Wooden veneer and with High-moisture percentage Wooden veneer described in two is parallel and forms core, while between the adjacent low-water-content Wooden veneer It is mutually perpendicular to place according to texture that the slab with moisture gradient is made;By 7 Wooden veneers after gluing according to it is vertical- Horizontal-vertical mode assembly, wherein the surface wood veneer that whole moisture content is 30% is placed in upper and lower two surface of slab.
4) hot pressing:After slab is put into press, finger gauge of the difference placing height for 80mm, hot pressing temperature in slab both sides It is 150 DEG C, hot pressing time 65s/mm.
5) release:After reaching hot pressing time, hot pressing terminates, and pressure is gradually decrease to 0, takes out slab, 6 hours to be cooled Afterwards, cutting edge and sanding (being handled through 60 mesh sand paper), are made the enhanced glued board in surface layer.
Embodiment 3
A kind of preparation method of the enhanced glued board in surface layer, includes the following steps:
1) rotary-cut:Board using poplar board (the density 0.4g/cm that thickness is 1.8mm is made in rotary-cut3):Selection wherein 2 is wooden Veneer, at 25 DEG C, using pneumatic water pistol to two surface alternating water deliveries of every veneer, wooden described in distance two It is alternately sprayed water at the 10cm distances of veneer surface to its surface using pneumatic water pistol, the nozzle inside diameter 3mm of pneumatic water pistol, Operating pressure 0.7MPa displays 150s after 32% of water quality for over dry Wooden veneer quality, obtains whole moisture content and is 30% surface wood veneer;Other 5 Wooden veneers are chosen, dry 20min, is obtained in the drying box for being 70 DEG C in steady temperature Obtain the core Wooden veneer that whole moisture content is 6%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 200g/m2, it is 2 that the addition of formaldehyde and phenol, which is compared, in phenolic resin:1, sodium hydroxide quality is the 40% of phenol quality;Phenolic aldehyde tree The solid content of fat is 45%.
3) assembly:The technique of the assembly is as follows:Shape is arranged in parallel up and down mutually in the high-moisture percentage Wooden veneer Into surface layer, then the parallel centre for being placed in the high-moisture percentage Wooden veneer described in two of the low-water-content Wooden veneer and with High-moisture percentage Wooden veneer described in two is parallel and forms core, while between the adjacent low-water-content Wooden veneer It is mutually perpendicular to place according to texture that the slab with moisture gradient is made;By 7 Wooden veneers after gluing according to it is vertical- Horizontal-vertical mode assembly, wherein the surface wood veneer that whole moisture content is 30% is placed in upper and lower two surface of slab.
4) hot pressing:After slab is put into press, finger gauge of the difference placing height for 80mm, hot pressing temperature in slab both sides It is 160 DEG C, hot pressing time 60s/mm.
5) release:After reaching hot pressing time, hot pressing terminates, and pressure is gradually decrease to 0, takes out slab, 6 hours to be cooled Afterwards, cutting edge and sanding (being handled through 60 mesh sand paper), are made the enhanced glued board in surface layer.
Comparative example:
A kind of preparation method of normal plywood, includes the following steps:
1) rotary-cut:The board using poplar board that thickness is 1.8mm is made in rotary-cut:7 Wooden veneers therein are chosen, in steady temperature For 20min dry in 70 DEG C of drying boxes, the Wooden veneer that whole moisture content is 6% is obtained.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 200g/m2, it is 2 that the addition of formaldehyde and phenol, which is compared, in phenolic resin:1, sodium hydroxide quality is the 40% of phenol quality;Phenolic aldehyde tree The solid content of fat is 45%.
3) assembly:By 7 Wooden veneers after gluing according to vertical-horizontal-vertical mode assembly.
4) hot pressing:After slab is put into press, finger gauge of the difference placing height for 80mm, hot pressing temperature in slab both sides It is 140 DEG C, hot pressing time 60s/mm.
5) release:After reaching hot pressing time, hot pressing terminates, and pressure is gradually decrease to 0, takes out slab, 6 hours to be cooled Afterwards, cutting edge and sanding (being handled through 60 mesh sand paper), are made the enhanced glued board in surface layer.
The standard specimen that glued board is made according to above three embodiments and comparative example is tested, test result is as follows Table 1.
The enhanced plywood character index in 1 surface layer of table
Consolidated statement 1, Fig. 1 and Fig. 2 are analyzed, the enhanced glued board in surface layer and common glue prepared using the method for the present invention Plywood is compared, although averag density is essentially identical, the surface layer density of the enhanced glued board in surface layer has aobvious compared with plain edition glued board Writing increases, and the densification effect on surface layer significantly improves bending strength, Deflection Modulus of Elasticity and the case hardness of glued board.
Embodiment 4
1) rotary-cut:Board using poplar board (the density 0.4g/cm that thickness is 1.8mm is made in rotary-cut3):Selection wherein 2 is wooden Veneer, at 20 DEG C, using pneumatic water pistol to two surface alternating water deliveries of every veneer, wooden described in distance two It is alternately sprayed water at the 10cm distances of veneer surface to its surface using pneumatic water pistol, the nozzle inside diameter 3mm of pneumatic water pistol, Operating pressure 0.7MPa displays 140s after 17% of water spray quality for over dry Wooden veneer quality, obtains whole moisture content and is 10% surface wood veneer;Other 5 Wooden veneers are chosen, dry 20min, is obtained in the drying box for being 50 DEG C in steady temperature Obtain the core Wooden veneer that whole moisture content is 5%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 200g/m2, it is 2 that the addition of formaldehyde and phenol, which is compared, in phenolic resin:1, sodium hydroxide quality is the 40% of phenol quality;Phenolic aldehyde tree The solid content of fat is 45%.
3) assembly:The technique of the assembly is as follows:Shape is arranged in parallel up and down mutually in the high-moisture percentage Wooden veneer Into surface layer, then the parallel centre for being placed in the high-moisture percentage Wooden veneer described in two of the low-water-content Wooden veneer and with High-moisture percentage Wooden veneer described in two is parallel and forms core, while between the adjacent low-water-content Wooden veneer It is mutually perpendicular to place according to texture that the slab with moisture gradient is made;By 7 Wooden veneers after gluing according to it is vertical- Horizontal-vertical mode (texture of timber) assembly, wherein the surface wood veneer that whole moisture content is 15% is placed in upper and lower two table of slab Face.
4) hot pressing:After slab is put into press, finger gauge of the difference placing height for 80mm, hot pressing temperature in slab both sides It is 140 DEG C, hot pressing time 50s/mm.
5) release:After reaching hot pressing time, hot pressing terminates, and pressure is gradually decrease to 0, takes out slab, 6 hours to be cooled Afterwards, cutting edge and sanding (being handled through 60 mesh sand paper), are made the enhanced glued board in surface layer.
Embodiment 5
With embodiment 4, difference is at 21 DEG C step, is replaced using pneumatic water pistol to two surfaces of every veneer Water spray displays 160s after 17% of water spray quality for over dry Wooden veneer quality, obtains the surface layer that whole moisture content is 11% Wooden veneer;Other 5 Wooden veneers are chosen, dry 20min in the drying box for being 70 DEG C in steady temperature obtains whole moisture content For 6% core Wooden veneer.
Embodiment 6
With embodiment 4, difference is at 22 DEG C step, is replaced using pneumatic water pistol to two surfaces of every veneer Water spray displays 180s after 17% of water spray quality for over dry Wooden veneer quality, obtains the surface layer that whole moisture content is 12% Wooden veneer;Other 5 Wooden veneers are chosen, dry 20min in the drying box for being 70 DEG C in steady temperature obtains whole moisture content For 6% core Wooden veneer.
Embodiment 7
With embodiment 4, difference is at 23 DEG C step, is replaced using pneumatic water pistol to two surfaces of every veneer Water spray displays 200s after 17% of water spray quality for over dry Wooden veneer quality, obtains the surface layer that whole moisture content is 13% Wooden veneer;Other 5 Wooden veneers are chosen, dry 20min in the drying box for being 70 DEG C in steady temperature obtains whole moisture content For 6% core Wooden veneer.
Embodiment 8
With embodiment 4, difference is at 24 DEG C step, is replaced using pneumatic water pistol to two surfaces of every veneer Water spray displays 200s after 17% of water spray quality for over dry Wooden veneer quality, obtains the surface layer that whole moisture content is 14% Wooden veneer;Other 5 Wooden veneers are chosen, dry 20min in the drying box for being 70 DEG C in steady temperature obtains whole moisture content For 6% core Wooden veneer.
Embodiment 9
A kind of preparation method of the enhanced glued board in surface layer, with embodiment 2, difference is at 26 DEG C step, utilizes gas Dynamic two surface alternating water deliveries of the water pistol to every veneer are handed at the Wooden veneer surface 50cm distances described in distance two It is sprayed water for its surface using pneumatic water pistol, the nozzle inside diameter 5mm of pneumatic water pistol, operating pressure 0.8MPa, until Water quality displays 120s after being the 24% of over dry Wooden veneer quality, obtains the surface wood veneer that whole moisture content is 16%;Choosing Other 5 Wooden veneers are taken, dry 20min in the drying box for being 62 DEG C in steady temperature obtains the core that whole moisture content is 8% Wooden veneer.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 240g/m2;Hot pressing:After slab is put into press, in slab both sides, finger gauge of the difference placing height for 80mm, hot pressing temperature are 155 DEG C, hot pressing time 50s/mm.
Embodiment 10
A kind of preparation method of the enhanced glued board in surface layer, with embodiment 2, difference is at 27 DEG C step, utilizes gas Dynamic two surface alternating water deliveries of the water pistol to every veneer are handed at the Wooden veneer surface 50cm distances described in distance two It is sprayed water for its surface using pneumatic water pistol, the nozzle inside diameter 6mm of pneumatic water pistol, operating pressure 0.8MPa, until Water quality displays 130s after being the 26% of over dry Wooden veneer quality, obtains the surface wood veneer that whole moisture content is 17%;Choosing Other 5 Wooden veneers are taken, (62 DEG C, 63 DEG C, 64 DEG C, 65 DEG C, 66 DEG C, 67 DEG C, 68 DEG C can also be taken for 63 DEG C in steady temperature And 69 DEG C) drying box in dry 60min, obtain the core Wooden veneer that whole moisture content is 7%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 260g/m2;Hot pressing:After slab is put into press, in slab both sides, finger gauge of the difference placing height for 80mm, hot pressing temperature are 160 DEG C, hot pressing time 60s/mm.
Embodiment 11
A kind of preparation method of the enhanced glued board in surface layer, with embodiment 2, difference is at 28 DEG C step, utilizes gas Dynamic two surface alternating water deliveries of the water pistol to every veneer are handed at the Wooden veneer surface 50cm distances described in distance two It is sprayed water for its surface using pneumatic water pistol, the nozzle inside diameter 8mm of pneumatic water pistol, operating pressure 0.8MPa, until Water quality displays 180s after being the 28% of over dry Wooden veneer quality, obtains the surface wood veneer that whole moisture content is 26%;Choosing Other 5 Wooden veneers are taken, dry 40min in the drying box for being 66 DEG C in steady temperature obtains the core that whole moisture content is 7% Wooden veneer.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 270g/m2;Hot pressing:After slab is put into press, in slab both sides, finger gauge of the difference placing height for 80mm, hot pressing temperature are 160 DEG C, hot pressing time 55s/mm.
Embodiment 12
A kind of preparation method of the enhanced glued board in surface layer, with embodiment 2, difference is at 29 DEG C step, utilizes gas Dynamic two surface alternating water deliveries of the water pistol to every veneer are handed at the Wooden veneer surface 50cm distances described in distance two It is sprayed water for its surface using pneumatic water pistol, the nozzle inside diameter 9mm of pneumatic water pistol, operating pressure 0.8MPa, until Water quality displays 190s after being the 30% of over dry Wooden veneer quality, and it is 29% to obtain whole moisture content;Choose other 5 wooden lists Plate, in the drying box that steady temperature is 69 DEG C (can also take 62 DEG C, 63 DEG C, 64 DEG C, 65 DEG C, 66 DEG C, 67 DEG C, 68 DEG C and 69 DEG C) Middle dry 20min obtains the core Wooden veneer that whole moisture content is 7%.
2) gluing:Covering with paint adhesive is carried out to above-mentioned 7 Wooden veneers, adhesive is phenolic resin, and double spread amount is 280g/m2;Hot pressing:After slab is put into press, in slab both sides, finger gauge of the difference placing height for 80mm, hot pressing temperature are 160 DEG C, hot pressing time 60s/mm.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in attached drawing What is shown is also one of embodiments of the present invention, and practical implementation process is not limited thereto.So if this field it is general Logical technical staff is enlightened by it, without departing from the spirit of the invention, is not inventively designed and the technology The similar frame mode of scheme and embodiment, are within the scope of protection of the invention.

Claims (10)

1. a kind of preparation method of the enhanced glued board in surface layer, which is characterized in that include the following steps:
(1) high-moisture percentage Wooden veneer is prepared, the high-moisture percentage is 10%-30%;
(2) low-water-content Wooden veneer is prepared, the low-water-content is 5%-8%;
(3) low-water-content Wooden veneer made from high-moisture percentage Wooden veneer made from step (1) and step (2) is subjected to surface Gluing simultaneously then carries out assembly, and the flow of the assembly is as follows:The high-moisture percentage Wooden veneer is disposed in parallel relation to one another shape Into surface layer, then the low-water-content Wooden veneer is placed in the high-moisture percentage Wooden veneer centre and with it is described High-moisture percentage Wooden veneer is parallel and forms core, and the slab with moisture gradient is made;
(4) hot-pressing processing is carried out to the slab obtained in step (3) with moisture gradient, carried out after hot-pressing processing release, Cooling, cutting edge and sanding processing, are made the enhanced glued board in surface layer.
2. a kind of preparation method of the enhanced glued board in surface layer according to claim 1, it is characterised in that:The step (1) high-moisture percentage Wooden veneer is prepared, by carrying out water spray processing to Wooden veneer surface.
3. a kind of preparation method of the enhanced glued board in surface layer according to claim 1 or 2, it is characterised in that:The step Suddenly Wooden veneer is one kind in rotary cut venner, sliced veneer or sawn veneer in (1) and step (2), and density is not more than 0.5g/cm3
4. the preparation method of the enhanced glued board in a kind of surface layer according to claim 2, which is characterized in that in step (1) The water spray processing, concrete operation step are:Under the conditions of 20 DEG C -30 DEG C, apart from Wooden veneer surface 10cm-50cm distances Place is alternately sprayed water to its surface using pneumatic water pistol, the nozzle inside diameter 3mm-10mm of pneumatic water pistol, operating pressure 0.7MPa-0.8MPa, the 12%-32% of quality when water spray quality is the Wooden veneer absolute dry condition;Reach scheduled spray After water quality, pneumatic water pistol stops water spray and the Wooden veneer is placed 20s-200s immediately.
5. a kind of preparation method of the enhanced glued board in surface layer according to claim 1, it is characterised in that:The step (2) low-water-content Wooden veneer is prepared in, preparation method is:Wooden veneer is dried processing, it is described it is dry at Reason carries out in drying box;Wherein drying temperature is 50 DEG C -70 DEG C, drying time 20min-60min.
6. a kind of preparation method of the enhanced glued board in surface layer according to claim 1, it is characterised in that:In step (3) The adhesive used during described gluing is phenolic resin, and the solid content of the phenolic resin is 30%-50%, the phenol The molar ratio of formaldehyde and phenol in raw material for preparing of urea formaldehyde is 2:1, sodium hydroxide quality be phenol quality 40%, described two The glue-spread of side surface is 200g/m2-280g/m2
7. a kind of preparation method of the enhanced glued board in surface layer according to claim 1, it is characterised in that:In step (3) The high-moisture percentage Wooden veneer side surface coating, the odd number Wooden veneer carry out both side surface gluing, Gao Han Water rate Wooden veneer is arranged in parallel to form surface layer up and down mutually, and then the low-water-content Wooden veneer is parallel is placed in two institutes The centre of high-moisture percentage Wooden veneer stated and parallel with the Wooden veneer of high-moisture percentage up and down and form core, same to phase It is mutually perpendicular to carry out placing the plate for being made and there is moisture gradient according to texture between the adjacent low-water-content Wooden veneer Base.
8. a kind of preparation method of the enhanced glued board in surface layer according to claim 1, it is characterised in that:In step (4) The condition of the hot-pressing processing is:140 DEG C -160 DEG C, hot pressing time 50s/mm-65s/mm of temperature, the thickness of finger gauge is institute The 60%-80% of the thickness of the slab with moisture gradient stated.
9. a kind of preparation method of the enhanced glued board in surface layer according to claim 6, it is characterised in that:The veneer is Board using poplar board of the thickness for 1.8mm, density 0.4g/cm3, at 25 DEG C, using pneumatic water pistol to two of every veneer Surface alternating water delivery alternately sprays water to its surface at the Wooden veneer surface 10cm distances described in distance two, pneumatic to spray water The nozzle inside diameter 3mm of rifle, operating pressure 0.7MPa display 150s after 32% of water quality for over dry Wooden veneer quality, Obtain the surface wood veneer that whole moisture content is 30%;In addition Wooden veneer, it is dry in drying box of the steady temperature for 70 DEG C 20min obtains the core Wooden veneer that whole moisture content is 6%;Covering with paint adhesive is carried out to above-mentioned Wooden veneer, adhesive is phenol Urea formaldehyde, double spread amount are 200g/m2, the solid content of phenolic resin is 45%;By the Wooden veneer after gluing according to it is vertical- Horizontal-vertical mode assembly, wherein the surface wood veneer that whole moisture content is 30% is placed in upper and lower two surface of slab;Slab is put into After press, finger gauge of the difference placing height for 80mm in slab both sides, hot pressing temperature is 160 DEG C, hot pressing time 60s/mm.
10. a kind of table made of preparation method using the enhanced glued board in surface layer as described in any one of claims 1-9 The enhanced glued board of layer.
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