CN103171002A - Solid wood veneer wet combining method and veneering intermediate plate - Google Patents
Solid wood veneer wet combining method and veneering intermediate plate Download PDFInfo
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- CN103171002A CN103171002A CN2013101264746A CN201310126474A CN103171002A CN 103171002 A CN103171002 A CN 103171002A CN 2013101264746 A CN2013101264746 A CN 2013101264746A CN 201310126474 A CN201310126474 A CN 201310126474A CN 103171002 A CN103171002 A CN 103171002A
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Abstract
The invention provides a solid wood veneer wet combining method through which the flatness of the veneer can be increased, the phenomena of ring shake around knots and knot crack are reduced and the production cost is reduced. The method comprises the following steps of: coating a thermosetting adhesive on the surface of a base material of a solid wood veneer to be pre-adhered; laminating two ends of the solid wood veneer of which the moisture content is more than or equal to 40 percent on the surface of the base material, wherein an arched part is formed between two ends of the solid wood veneer, the length of the arched part is 1/4-1/3 of the length of the solid wood veneer, and the largest height of the arched part is 0.5-1 percent of the length between two ends of the solid wood veneer; and carrying out seamless butt joint between two adjacent solid wood veneers, and performing hot press molding. The invention also provides a veneering intermediate plate, a laminated board manufactured by performing hot-pressing on the veneering intermediate plate is high in surface flatness, and the ring shake around knots and knot crack are reduced. The veneering intermediate plate comprises a base material, and a solid wood veneer which is laminated on the surface of the base material and has the moisture content of more than or equal to 40 percent, wherein two ends of the solid wood veneer are laminated on the surface of the base material, the arched part is formed between two ends of the solid wood veneer, the height of the arched part is 1/4-1/3 of the length of the solid wood veneer, and seamless butt joint between two adjacent solid wood veneers is realized.
Description
Technical field
Present technique relates to a kind of hot pressing veneer method of solid wood veneer and is covered with the veneer intermediate plate of solid wood veneer, specifically a kind of veneer method of high-moisture percentage solid wood veneer and the veneer intermediate plate that is covered with high-moisture percentage solid wood veneer.
Background technology
Current, the veneer application of solid wood veneer is more and more wider, comprises the veneer of solid wooden compound floor, furniture surface veneer, decorations veneer etc.But present solid wood veneer facing technology mainly adopts the veneer method of dried veneer, will carry out veneer after solid wood veneer drying specifically again.This method has three kinds of drawbacks, the one, needed to carry out the solid wood veneer is carried out the dry plate drying before veneer, this has increased production cost, the 2nd, the solid wood veneer after drying is because the distortion flexural deformation that seasoning defect drying defect produces causes the veneer out-of-flatness, and the 3rd, the solid wood veneer of drying can produce the phenomenon that ring crack and knot ftracture around knot carrying out veneer after.
Technology contents
The purpose of present technique is to provide a kind of flatness that can increase veneer, reduces the generation of ring crack and knot cracking phenomena around the knot, the wet combining method of the solid wood veneer that reduces production costs simultaneously.
The wet combining method of this solid wood veneer comprises the steps: to be coated with the agent of thermosetting gluing at the substrate surface of pre-sturdy wooden veneer; The two ends of solid wood veneer are pasted at substrate surface, arched part between the two ends of the solid wood veneer that pastes mutually with base material, the length of this arched part is the 1/3-1/4 of length between solid wood veneer two ends, and the maximum height of arched part is the 0.5%-1% of length between solid wood veneer two ends; The moisture content of the solid wood veneer before pasting 〉=40%; Seamless docking between the adjacent two solid wood veneers that paste, then hot-forming in hot press the base material that is covered with the solid wood veneer.
The beneficial effect of this wet combining method: present technique is the wet combining technology of solid wood veneer, namely at the solid wood veneer before undried, moisture content when above, carries out the solid wood veneer overlay 40%.When the solid wood veneer is attached to substrate surface, with the solid wood veneer veneer length 1/3-1/4 that arches upward, the maximum height of arched part is the 0.5%-1% of length between solid wood veneer two ends, to replenish its amount of contraction that produces in the hot-pressing drying process, there is no ring crack and knot cracking phenomena around the surfacing no wrinkle that pastes the solid wood veneer of the thick china of finally making, the knot on the solid wood veneer.Arching upward, it is too high highly to be difficult for, and too high meeting surpasses its amount of contraction in follow-up hot-pressing drying process, and the surface also can out-of-flatness.Arching upward, it is too low highly to be difficult for, and too low meeting is less than its amount of contraction in follow-up hot-pressing drying process, also easily causes cracking.
The wet combining method of above-mentioned solid wood veneer, arched part is positioned at the centre position of solid wood veneer length direction, and the highest point of arched part is positioned at the length direction centre position of arched part.
The wet combining method of above-mentioned solid wood veneer, three hot pressing before and after the hot pressing time-division after each hot pressing, is unloaded pressure and is depressed into zero, does not keep 30-60 second but heating platen does not break away from veneer.After each hot pressing, pressure is unloaded be depressed into zero, but heating platen does not break away from veneer, purpose so that the moisture in the solid wood veneer can distribute more fully.The selection of hot pressing time temperature, pressure and adhesive is relevant.Preferred each hot pressing time is 1-2min, and pressure is 1-2.5MPa, and temperature is 120-130 ℃, and back pressure once is greater than previous pressure.
The wet combining method of above-mentioned solid wood veneer, base material are medium density fibre board (MDF) or glued board.
Present technique provides a kind of veneer intermediate plate simultaneously, and is high the thick china surface smoothness that makes after this veneer intermediate plate hot pressing, and around knot, ring crack and knot cracking is few.
This veneer intermediate plate, comprise base material, paste the solid wood veneer at substrate surface, the two ends of solid wood veneer paste at substrate surface, arched part between the two ends of the solid wood veneer that pastes mutually with base material, the length of this arched part is the 1/3-1/4 of length between solid wood veneer two ends, and the maximum height of arched part is the 0.5%-1% of length between solid wood veneer two ends; Described solid wood veneer moisture content 〉=40%; Seamless docking between the adjacent two solid wood veneers that paste.
The beneficial effect of this veneer intermediate plate: moisture content is pasted at substrate surface at the undried solid wood veneer more than 40% formed the veneer intermediate plate.Again the veneer intermediate plate is carried out hot pressing and namely get thick china.With the arch upward height of length 1/3-1/4 of solid wood veneer, to replenish its amount of contraction that produces in postorder hot-pressing drying process, there is no ring crack and knot cracking phenomena around the surfacing no wrinkle that pastes the solid wood veneer of the thick china of finally making, the knot on the solid wood veneer.Arching upward, it is too high highly to be difficult for, and too high meeting surpasses its amount of contraction in follow-up hot-pressing drying process, and the surface also can out-of-flatness.Arching upward, it is too low highly to be difficult for, and too low meeting is less than its amount of contraction in follow-up hot-pressing drying process, also easily causes cracking.
Above-mentioned veneer intermediate plate, arched part is positioned at the centre position of solid wood veneer length direction, and the highest point of arched part is positioned at the length direction centre position of arched part.
Above-mentioned veneer intermediate plate, base material are medium density fibre board (MDF) or glued board.
Description of drawings
Fig. 1 is veneer intermediate plate schematic diagram.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, present technique is described further.
Embodiment 1: the preparation of thick china
A, preparation veneer intermediate plate: referring to Fig. 1, be coated with urea-formaldehyde resin adhesive on medium density fibre board (MDF) (base material) 2 surfaces of pre-sturdy wooden veneer 1; The two ends 11,12 of solid wood veneer are pasted on the medium density fibre board (MDF) surface, arched part 13 between the two ends of the solid wood veneer that pastes mutually with base material, the maximum height T of this arched part is length (length between the two ends when the solid wood veneer is set level between solid wood veneer two ends, T is less because of maximum height, between two ends when the solid wood veneer is set level, length approximates the L that marks in figure) 0.8% left and right, the length of arched part (T is less because of maximum height, and the length of arched part approximates the M that marks in figure) be between solid wood veneer two ends length 1/3; Arched part is positioned at the centre position of solid wood veneer length direction.The highest point of this arched part is positioned at the arched part centre position of solid wood veneer length direction.Seamless docking between the adjacent two solid wood veneers 1 that paste.Generally, solid wood veneer length L=30cm, T=2.4mm, M=10cm.
B, hot-forming: hot-forming in hot press the veneer intermediate plate.Hot pressing divides 3 sections hot pressing, phase I pressure is 1.5MPa, hot pressing temperature is 120 ℃, hot pressing time is 2min, reach release after the phase I hot pressing time, heating platen does not break away from top layer pine veneer, so that the aqueous dispersion in pine veneer veneer sends out, urea-formaldehyde resin adhesive obtains precuring simultaneously, keeps entering second stage hot pressing after 60 seconds; Second stage hot pressing pressure 2.0Mpa, 120 ℃ of hot pressing temperatures, hot pressing time is 1min, reach release after the second stage hot pressing time, heating platen does not break away from top layer pine veneer, kept 30 seconds, and so that the moisture in the veneer veneer further distributes, and urea-formaldehyde resin adhesive was further solidified; Phase III hot pressing pressure 2.5MPa, 120 ℃ of hot pressing temperatures, hot pressing time 2min.Reach release after hot pressing time, heating platen breaks away from top layer pine veneer, and wet combining technique is completed.The thick china surfacing that makes is without cracking phenomena.
In this embodiment 1, the solid wood veneer is that pine is carried out the veneer (pine rotary-cut veneer) that rotary-cut is made, and thickness is 0.3-0.4mm.The moisture content 100% of the pine rotary-cut veneer before pasting.
Embodiment 2: the preparation of thick china
A, preparation veneer intermediate plate: referring to Fig. 1, be coated with phenolic resin adhesive after glued board (base material) 2 sanding surfaces of pre-sturdy wooden veneer 1; The two ends 11,12 of solid wood veneer are pasted at the glued board substrate surface, arched part 13 between the two ends of the solid wood veneer that pastes mutually with base material, the maximum height T of this arched part is length (length between the two ends when the solid wood veneer is set level between solid wood veneer two ends, T is less because of maximum height, between two ends when the solid wood veneer is set level, length approximates the L that marks in figure) 0.6% left and right, the length of arched part (T is less because of maximum height, and the length of arched part approximates the M that marks in figure) be between solid wood veneer two ends length 1/4; Arched part is positioned at the centre position of solid wood veneer length direction.The highest point of this arched part is positioned at the arched part centre position of solid wood veneer length direction.The texture of solid wood veneer and the mutual vertical interlaced of substrate surface texture that pastes or parallelly all can.Seamless docking between the adjacent two solid wood veneers 1 that paste.Generally, solid wood veneer length L=30cm, T=1.8mm, M=7.5cm.
B, hot-forming: hot-forming in hot press the veneer intermediate plate.Hot pressing is divided into 3 sections hot pressing, phase I pressure is 1.0MPa, hot pressing temperature is 125 ℃, hot pressing time is 1min, reach release after the phase I hot pressing time, heating platen does not break away from the husky Billy's veneer in top layer, so that the aqueous dispersion in husky Billy's veneer veneer sends out, phenolic resin adhesive obtains precuring simultaneously, keeps entering second stage hot pressing after 60 seconds; Second stage hot pressing pressure 1.5Mpa, 130 ℃ of hot pressing temperatures, hot pressing time is 1min, reach release after the second stage hot pressing time, heating platen does not break away from the husky Billy's veneer in top layer, kept 30 seconds, and so that the moisture in the veneer veneer further distributes, and phenolic resin adhesive was further solidified; Phase III hot pressing pressure 2.0MPa, 130 ℃ of hot pressing temperatures, hot pressing time 2min.Reach release after hot pressing time, heating platen breaks away from the husky Billy's veneer in top layer, and wet combining technique is completed.The thick china surfacing that makes is without cracking phenomena.
In this embodiment 2, the solid wood veneer is that husky Billy is carried out the veneer (husky Billy's slicing veneer) that slicing is made, and thickness is 0.4-0.5mm.The moisture content 50% of the husky Billy's slicing veneer before pasting.
Present technique is owing to having adopted solid wood veneer wet combining technology, take glued board or fiberboard as base material, the precious natural veneer of top layer veneer, can save large footpath level precious timber, the phenomenon along knot ring crack and knot cracking that not only can avoid traditional handicraft to produce in the veneer process, and can guarantee that veneer is smooth, the technique convenient operation, reduced production cost simultaneously.
Claims (8)
1. the wet combining method of solid wood veneer, is characterized in that: comprise the steps: to be coated with the agent of thermosetting gluing at the substrate surface of pre-sturdy wooden veneer; The two ends of solid wood veneer are pasted at substrate surface, arched part between the two ends of the solid wood veneer that pastes mutually with base material, the length of this arched part is the 1/3-1/4 of length between solid wood veneer two ends, and the maximum height of arched part is the 0.5%-1% of length between solid wood veneer two ends; The moisture content of the solid wood veneer before pasting 〉=40%; Seamless docking between the adjacent two solid wood veneers that paste, then hot-forming in hot press the base material that is covered with the solid wood veneer.
2. the wet combining method of solid wood veneer as claimed in claim 1, it is characterized in that: arched part is positioned at the centre position of solid wood veneer length direction, and the highest point of arched part is positioned at the length direction centre position of arched part.
3. the wet combining method of solid wood veneer as claimed in claim 1 or 2 is characterized in that: three hot pressing before and after the hot pressing time-division, and after each hot pressing, pressure is unloaded be depressed into zero, but not breaking away from veneer, heating platen keeps 30-60 second.
4. the wet combining method of solid wood veneer as claimed in claim 3 is characterized in that: each hot pressing time is 1-2min, and pressure is 1-2.5MPa, and temperature is 120-130 ℃; Back pressure once is greater than previous pressure.
5. the wet combining method of solid wood veneer as claimed in claim 1 or 2, it is characterized in that: base material is medium density fibre board (MDF) or glued board.
6. veneer intermediate plate, comprise base material, paste the solid wood veneer at substrate surface, it is characterized in that: the two ends of solid wood veneer paste at substrate surface, arched part between the two ends of the solid wood veneer that pastes mutually with base material, the length of this arched part is the 1/3-1/4 of length between solid wood veneer two ends, and the maximum height of arched part is the 0.5%-1% of length between solid wood veneer two ends; Described solid wood veneer moisture content 〉=40%; Seamless docking between the adjacent two solid wood veneers that paste.
7. veneer intermediate plate as claimed in claim 6, it is characterized in that: arched part is positioned at the centre position of solid wood veneer length direction, and the highest point of arched part is positioned at the length direction centre position of arched part.
8. veneer intermediate plate as claimed in claim 6, it is characterized in that: base material is medium density fibre board (MDF) or glued board.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101264746A CN103171002A (en) | 2013-04-12 | 2013-04-12 | Solid wood veneer wet combining method and veneering intermediate plate |
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| CN2013101264746A CN103171002A (en) | 2013-04-12 | 2013-04-12 | Solid wood veneer wet combining method and veneering intermediate plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107009448A (en) * | 2017-05-25 | 2017-08-04 | 山东立晨集团有限公司 | A kind of environment-friendly solid wood veneer overlay intermediate plate and its processing method |
| CN108927859A (en) * | 2018-08-03 | 2018-12-04 | 湖州奇士堂工业设计有限公司 | A kind of veneer patch processing method of composite plywood |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107009448A (en) * | 2017-05-25 | 2017-08-04 | 山东立晨集团有限公司 | A kind of environment-friendly solid wood veneer overlay intermediate plate and its processing method |
| CN108927859A (en) * | 2018-08-03 | 2018-12-04 | 湖州奇士堂工业设计有限公司 | A kind of veneer patch processing method of composite plywood |
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Application publication date: 20130626 |