CN104608211A - Plywood with super-thick core layer and preparation process thereof - Google Patents
Plywood with super-thick core layer and preparation process thereof Download PDFInfo
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- CN104608211A CN104608211A CN201510061762.7A CN201510061762A CN104608211A CN 104608211 A CN104608211 A CN 104608211A CN 201510061762 A CN201510061762 A CN 201510061762A CN 104608211 A CN104608211 A CN 104608211A
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- veneer
- glued board
- sandwich layer
- preparation technology
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- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000012792 core layer Substances 0.000 title claims abstract description 10
- 239000011120 plywood Substances 0.000 title abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 62
- 238000007731 hot pressing Methods 0.000 claims abstract description 49
- 238000001035 drying Methods 0.000 claims abstract description 30
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims description 25
- 239000007787 solid Substances 0.000 claims description 18
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical class OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims description 5
- 235000019270 ammonium chloride Nutrition 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002344 surface layer Substances 0.000 abstract 2
- 238000005452 bending Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 241000219000 Populus Species 0.000 description 7
- 239000004744 fabric Substances 0.000 description 7
- 239000002023 wood Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 235000019256 formaldehyde Nutrition 0.000 description 3
- 238000012913 prioritisation Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 244000166124 Eucalyptus globulus Species 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 239000002365 multiple layer Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000009423 ventilation 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention relates to plywood with a super-thick core layer and a preparation process of the plywood. The plywood is composed of the core layer, a surface layer and a bottom layer. The thickness of the core layer ranges from 8 mm to 12 mm. The thickness of the surface layer and the thickness of the bottom layer each ranges from 4 mm to 6 mm. The overall thickness of the plywood can reach 16-24 mm. The preparation process includes the steps of veneer preparation, selection, hot-press drying, sorting and gluing, prepressing, hot-pressing and the like. The prepared plywood is less in adhesive consumption, and the adhesive consumption can reduce by 20%-50%. The plywood is healthy and environmentally friendly, the formaldehyde emission content reaches and even exceeds the E0 level. All strength indexes of the plywood are increased to different degrees compared with common plywood, the static bending intensity, the strength modulus and the bonding strength are high, and the bonding strength is improved by 10% compared with the common plywood.
Description
Technical field
The present invention relates to a kind of glued board and preparation technology thereof, be applicable to the glued board that core layer thickness is larger, specifically, relate to a kind of glued board and preparation technology thereof of sandwich layer super thick, belong to glued board technical field.
Background technology
Glued board, refers to by a kind of wood-base fibre and particle panel material of the Veneer gluing in different texture direction.Its adjacent layer veneer texture usually mutually at an angle of 90.Glued board is peeled into veneer by juggle or becomes veneer by flitch slicing, then stick with glue three layers or the board-like material of multilayer of agent gummed, and structure mostly is odd-level, in particular cases also has and make the even levels such as 4 layers, 6 layers.Due to glued board have that little, the breadth of distortion is large, the feature such as easy construction, not easily warpage, tensile strength perpendicular to grain are large, obtain extensive use at furniture, compartment, shipbuilding, military project, packaging and other industrial departments.
The outermost layer veneer of composition glued board claims dash board, and the dash board in front is called panel, and the dash board of reverse side is called backboard, and the thickness of dash board and backboard is generally respectively 0.6 ~ 1.6 mm, and the veneer of internal layer is called central layer or middle plate, and core thickness is generally 1.0 ~ 1.8 mm.Veneer is the thin plate made with rotary-cut, slicing, sawing method.The production process of glued board has: log blocks, log hydrothermal treatment consists, peeling, determine juggle center, veneer cutting, veneer drying, veneer shear with splicing, veneer shaping processing, veneer gluing, assembly, precompressed and hot pressing, cutting edge, scrape light or polishing, check, grade and packaging etc.
Normal plywood veneer thickness is thinner, and the mode that veneer drying adopts steam drying machine to carry out drying is dry.
Such glued board has several limitation, and when first will produce the thicker glued board of thickness, if thickness is more than the glued board of 10mm, thin veneer will multiple-layer stacked, nearly tens layers, adds the amount of labour of workman, reduces efficiency.Secondly the veneer bonding of multiple-layer stacked, need every layer of coating adhesive, adhesive large usage quantity, increases considerably production cost, and the feature of environmental protection is poor, the formaldehyde in adhesive etc., and volatile materials affects environment for use.Veneer drying adopts steam drying mode, consumes energy higher.
Chinese patent CN103406951A discloses the production method of a kind of protection against the tide full Eucalyptus lamination decoration panel, the base material that this wood-based plate is bondd by adhesive by multilayer Eucalyptus veneer and melamine gum dipped paper high temperature overlay and form, comprise veneer sorting, gluing, cold pressing, hot pressing, stacking health and paste melamine gum dipped paper step, it is characterized in that: adopt and cold pressing for three times and three hot pressing, twice thermostatic chamber leaves standstill health and twice heat radiation health; Described temperature of colding pressing is room temperature, and pressure is 0.8 ~ 1.0MPa, and hot pressing pressure is 1.5 ~ 2.0MPa; The temperature of first time hot pressing is 120 ~ 125 DEG C; The temperature of second time hot pressing is 115 ~ 120 DEG C, and the temperature of third time hot pressing is 125 ~ 130 DEG C; It is 80 ~ 90 DEG C that described thermostatic chamber leaves standstill health temperature, and the time is 4 ~ 6h; Described heat radiation health is that thermostatic chamber gravity-flow ventilation is cooled to room temperature, and the time is 3 ~ 4h.This kind of method produces the veneer that glued board still uses general thickness, when producing thicker sheet material, still needs, with multilayer single plate superposition, cannot save artificial and adhesive cost.
Chinese patent CN104191471A discloses a kind of high strength poplar laminated veneer lumber and manufacture method thereof, this Wood-based Panel Production method is a kind of high strength poplar laminated veneer lumber, its structure stacks gradually gummed by board using poplar board and glass fabric and carbon cloth to form, glass fabric is on the upper strata of carbon cloth, and dash board and base plate are board using poplar board.The invention also discloses the manufacture method of this high strength poplar laminated veneer lumber, comprising: the preparation of raw material board using poplar board, fiber cloth dipping, board using poplar board gluing, short grain assembly and add fiber cloth, stage hot pressing, cooling with rebuild.The present invention, by the humidification of two kinds of fiber cloth, improves the intensity of laminated veneer lumber, obviously improves weatherability, make laminated veneer lumber size more stable.Adopt stage hot-pressing technique to carry out twice hot pressing stage by stage to laminated veneer lumber, shorten pressing cycle, improve productivity ratio, a part has carried out secondary hot pressing between layers simultaneously, is conducive to the mechanical property improving laminated veneer lumber.This kind of method produces the veneer that glued board still uses general thickness, need superpose, cannot save artificial and adhesive cost with multilayer single plate.
At present, cost of labor is more and more higher, and the health environment-friendly of people consciousness also day by day strengthens, and therefore, is badly in need of that a kind of cost of labor of research and development is low, adhesive consumption is few, and health environment-friendly, consume energy low plywood production technology.
Summary of the invention
The problem to be solved in the present invention is for above deficiency, a kind of glued board of sandwich layer super thick is provided, by sandwich layer, top layer and bottom three-decker are formed, wherein core layer thickness is 8 ~ 12 mm, top layer and underlayer thickness are respectively 4 ~ 6 mm, the integral thickness of glued board can reach 16 ~ 24 mm, adhesive consumption is few, adhesive consumption reduces 20% ~ 50%, health environment-friendly, burst size of methanal reaches the even super E0 level of E0 level, the every intensity index of sheet material all has lifting in various degree compared with normal plywood, MOR and epistasis modulus high, bonding strength is high, bonding strength comparatively normal plywood improves 10%,
Wide adaptability, extensively can replace core-board, integrated timber, solid wood board etc. to make furniture, also can use as engineering material.
The present invention also provides a kind of preparation technology of glued board of sandwich layer super thick, and have simple, the rational advantage of production process, efficiency improves 30% ~ 60%, and energy consumption reduces by 20% compared with the energy consumption of normal plywood, is applicable to suitability for industrialized production.
For overcoming the above problems, the present invention by the following technical solutions: a kind of glued board of sandwich layer super thick, is made up of sandwich layer, top layer and bottom three-decker, it is characterized in that: described core layer thickness is 8 ~ 12 mm, and top layer and underlayer thickness are respectively 4 ~ 6 mm.
A kind of prioritization scheme, the bonding strength of described glued board improves 10%.
The present invention also provides a kind of preparation technology of glued board of sandwich layer super thick, comprises veneer hot-pressing drying step.
In veneer hot-pressing drying step: adopt multi-daylight press to carry out hot pressing oven dry to qualified veneer, the platen temperature that hot pressing is dried is 180 DEG C, platen pressure is 0.2 MPa, and in hot-pressing drying process, release exhaust is 60 ~ 120 s with the interval time of pressurization pressurize, and drying time is 20 ~ 60 min.
Another kind of prioritization scheme, described preparation technology also comprises veneer and arranges glue application step.
Veneer arranges in glue application step: after the veneer after hot-pressing drying arranges, gluing is carried out above to the upper surface of sandwich layer veneer and bottom veneer, gluing adopts the mode of roller coat, apply modified urea-formaldehyde resin adhesive, adhesive solid content is 40% ~ 52%, add the starch of 10% as filler, glue-spread is 200 ~ 250 g/m
2, add ammonium chloride as curing agent, the addition of chloride solid is 3% of adhesive solid gross mass.
Another prioritization scheme, described preparation technology also comprises precompressed, heat-press step.
In described precompressed, heat-press step: hot pressing temperature is: 120 DEG C ~ 145 DEG C, pressure is high pressure: 10 ~ 12 MPa, and the time is: 15 ~ 25 minutes.
The present invention adopts above technical scheme, compared with prior art, tool has the following advantages: described glued board is three-decker, and sandwich layer uses thickness at the rotary cut venner of 8 ~ 12 mm, top layer and bottom use the rotary cut venner of 4 ~ 6 mm respectively, become glued board through high pressure, high-temperature high-pressure.The glued board good stability of the dimension produced, MOR, epistasis modulus are high, nail-holding ability is good, bonding strength comparatively normal plywood improves 10%, various different processing mode can be adapted to, applicability is wide, can extensively replace solid wood board, integrated timber, core-board etc. with for making solid wood furniture or for engineering material.
The preparation technology of the glued board of sandwich layer super thick provided by the invention, have production technology rationally, simple, efficiency is high, it is low to consume energy, and is applicable to the feature of suitability for industrialized production.
This method has saved cost of labor, reduces energy consumption, improves the intensity index of product, and reducing burst size of methanal, comparatively normal plywood more health environment-friendly, in today that wood raw material lacks day by day, is the Resource comprehensive utilization method that a kind of benefit is very high.
Below in conjunction with embodiment, the present invention is described in detail.
Detailed description of the invention
Embodiment 1, a kind of glued board of sandwich layer super thick, is made up of sandwich layer, top layer and bottom three-decker, and wherein core layer thickness is 8 ~ 12 mm, and top layer and underlayer thickness are respectively 4 ~ 6 mm, and the integral thickness of glued board can reach 16 ~ 24 mm.
The preparation technology of described glued board comprises the following steps:
1) veneer preparation.
Choose the log of length more than 6 m, carry out sawed-off according to the length of technological requirement and quality, the juggle of intercepting should be the length of the additional allowance of glued board finished size.
Be described for the finished product glued board of breadth 1220 mm × 2440 mm, the juggle length of intercepting is 2600 mm.
Sawed log carries out softening and increasing plasticity through humid heat treatment, and the temperature of humid heat treatment is 50 ~ 100 DEG C, and the time of humid heat treatment is 72 hours.
Log after humid heat treatment is through peeling, carry out rotary-cut again and be produced into veneer, according to the requirement of glued board appearance ratings standard, the good rounding of defect is few, presentation quality is top layer or bottom, thickness is 4 ~ 6 mm, common or have the rounding of open defect to be sandwich layer, thickness is 8 ~ 12 mm.
2) veneer is selected.
The veneer good to rotary-cut is selected, and qualified veneer enters subsequent processing.
3) veneer hot-pressing drying.
Adopt multi-daylight press to carry out hot pressing oven dry to qualified veneer, the platen temperature that hot pressing is dried is 180 DEG C, and platen pressure is 0.2 MPa, and in hot-pressing drying process, release exhaust is 60 ~ 120 s with the interval time of pressurization pressurize, and drying time is 20 ~ 60 min.
Adopt this step both can make veneer drying, also can realize the shaping of thick veneer, eliminate the internal stress of veneer.
In the present embodiment, multi-daylight press adopts veneer hot-pressing drying machine, compared with traditional guipure, roller dryer, have power saving, economize heat energy, workshop floor space is few, and production efficiency is high, Operation and Maintenance is simple, the advantages such as day-to-day loss is low, power is 15 kW, thermal energy consumption only 1,600,000 kilojoules, workshop floor space 10 square metres, every day can dry 20m
3.
4) veneer arranges gluing.
After veneer after hot-pressing drying arranges, carry out gluing above to the upper surface of sandwich layer veneer and bottom veneer, gluing adopts the mode of roller coat, apply modified urea-formaldehyde resin adhesive, adhesive solid content is 52%, adds the starch of 10% as filler, and glue-spread is 250 g/m
2, add ammonium chloride as curing agent, the addition of chloride solid is 3% of adhesive solid gross mass.
5) precompressed, hot pressing.
Glue-coated veneer is superposed by bottom, sandwich layer, three layers, top layer veneer, machine direction is vertical, be transported into preformer and carry out precompressed, precompressed makes slab stick into entirety before entering hot pressing and is convenient to put into fast hot press, thus can shortening heat press idle time, the loss due to spoiled work caused because dash board moves dislocation, lap seam etc. when reducing installation, and adjustable Veneer moisture, improve the quality of products.
Slab after precompressed is transported multi-daylight press and is carried out hot pressing, and hot pressing temperature is: 120 DEG C ~ 135 DEG C, and pressure is high pressure: 10 ~ 12 MPa, and the time is: 15 ~ 20 minutes.
6) cutting edge, sanding.
The hair plates that hot pressing is good is cut into stock board.
Sanding is carried out to face veneer, makes plate face bright and clean attractive in appearance.
7) inspection grades, packs warehouse-in.
According to national standard, the glued board produced is graded inspection, packaging warehouse-in.
The glued board adopting the preparation technology of the present embodiment to obtain is mainly used in indoor type E0 level environment-friendly plywood, and its Testing index is as shown in the table.
Table 1 indoor type E0 level environment-friendly plywood Testing index
Embodiment 2, a kind of glued board of sandwich layer super thick, is made up of sandwich layer, top layer and bottom three-decker, and wherein core layer thickness is 8 ~ 12 mm, and top layer and underlayer thickness are respectively 4 ~ 6 mm, and the integral thickness of glued board can reach 16 ~ 24 mm.
The preparation technology of described glued board comprises the following steps:
1) veneer preparation.
Choose the log of length more than 6 m, carry out sawed-off according to the length of technological requirement and quality, the juggle of intercepting should be the length of the additional allowance of glued board finished size.
Be described for the finished product glued board of breadth 1220 mm × 2440 mm, the juggle length of intercepting is 2600 mm.
Sawed log carries out softening and increasing plasticity through humid heat treatment, and the temperature of humid heat treatment is 50 ~ 100 DEG C, and the time of humid heat treatment is 72 hours.
Log after humid heat treatment is through peeling, carry out rotary-cut again and be produced into veneer, according to the requirement of glued board appearance ratings standard, the good rounding of defect is few, presentation quality is top layer or bottom, thickness is generally 4 ~ 6 mm, common or have the rounding of open defect to be sandwich layer, thickness is 8 ~ 12 mm.
2) veneer is selected.
The veneer good to rotary-cut is selected, and qualified veneer enters subsequent processing.
3) veneer hot-pressing drying.
Adopt multi-daylight press to carry out hot pressing oven dry to qualified veneer, the platen temperature that hot pressing is dried is 180 DEG C, and platen pressure is 0.2 MPa, and in hot-pressing drying process, release exhaust is 60 ~ 120 s with the interval time of pressurization pressurize, and drying time is 20 ~ 60 min.
Adopt this step to make veneer drying, also can realize the shaping of thick veneer, eliminate the internal stress of veneer.
In the present embodiment, multi-daylight press adopts veneer hot-pressing drying machine, compared with traditional guipure, roller dryer, have power saving, economize heat energy, workshop floor space is few, and production efficiency is high, Operation and Maintenance is simple, the advantages such as day-to-day loss is low, power is 15 kW, thermal energy consumption only 1,600,000 kilojoules, workshop floor space 10 square metres, every day can dry 20m
3.
4) veneer arranges gluing.
After veneer after hot-pressing drying arranges, carry out gluing above to the upper surface of sandwich layer veneer and bottom veneer, gluing adopts the mode of roller coat, apply modified urea-formaldehyde resin adhesive, adhesive solid content is 40%, adds the starch of 10% as filler, and glue-spread is 200 g/m
2, add ammonium chloride as curing agent, the addition of chloride solid is 3% of adhesive solid gross mass.
5) precompressed, hot pressing.
Glue-coated veneer is superposed by bottom, sandwich layer, three layers, top layer veneer, machine direction is vertical, be transported into preformer and carry out precompressed, precompressed makes slab stick into entirety before entering hot pressing and is convenient to put into fast hot press, thus can shortening heat press idle time, the loss due to spoiled work caused because dash board moves dislocation, lap seam etc. when reducing installation, and adjustable Veneer moisture, improve the quality of products.
Slab after precompressed is transported multi-daylight press and is carried out hot pressing, and hot pressing temperature is: 130 DEG C ~ 145 DEG C, and pressure is high pressure: 10 ~ 12 MPa, and the time is: 20 ~ 25 minutes.
6) cutting edge, sanding.
The hair plates that hot pressing is good is cut into stock board.
Sanding is carried out to face veneer, makes plate face bright and clean attractive in appearance.
7) inspection grades, packs warehouse-in.
According to national standard, the glued board produced is graded inspection, packaging warehouse-in.
The glued board adopting the preparation technology of the present embodiment to obtain is mainly used in the ageing-resistant glued board of outdoor version, and its Testing index is as shown in the table.
The ageing-resistant glued board Testing index of outdoor version
Certainly, the above is the citing of best mode for carrying out the invention, and the part wherein do not addressed in detail is the common practise of those of ordinary skill in the art.Above-mentioned explanation is not the restriction to invention; the present invention is also not limited to above-mentioned citing; protection scope of the present invention is as the criterion with the content of claim; those skilled in the art; the change made in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (9)
1. a glued board for sandwich layer super thick, is made up of sandwich layer, top layer and bottom three-decker, it is characterized in that: described core layer thickness is 8 ~ 12 mm, and top layer and underlayer thickness are respectively 4 ~ 6 mm.
2. the glued board of a kind of sandwich layer super thick as claimed in claim 1, is characterized in that: the bonding strength of described glued board improves 10%.
3. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 1 or 2, is characterized in that: described preparation technology comprises veneer hot-pressing drying step.
4. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 3, it is characterized in that: in described veneer hot-pressing drying step: adopt multi-daylight press to carry out hot pressing oven dry to qualified veneer, the platen temperature that hot pressing is dried is 180 DEG C, platen pressure is 0.2 MPa, in hot-pressing drying process, release exhaust is 60 ~ 120 s with the interval time of pressurization pressurize, and drying time is 20 ~ 60 min.
5. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 3, is characterized in that: described preparation technology also comprises veneer and arranges glue application step.
6. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 5, it is characterized in that: described veneer arranges in glue application step: after the veneer after hot-pressing drying arranges, gluing is carried out above to the upper surface of sandwich layer veneer and bottom veneer, gluing adopts the mode of roller coat, apply modified urea-formaldehyde resin adhesive, adhesive solid content is 52%, adds the starch of 10% as filler, and glue-spread is 250 g/m
2, add ammonium chloride as curing agent, the addition of chloride solid is 3% of adhesive solid gross mass.
7. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 5, it is characterized in that: described veneer arranges in glue application step: after the veneer after hot-pressing drying arranges, gluing is carried out above to the upper surface of sandwich layer veneer and bottom veneer, gluing adopts the mode of roller coat, apply modified urea-formaldehyde resin adhesive, adhesive solid content is 40%, add the starch of 10% as filler, glue-spread is 200 g/m2, add ammonium chloride as curing agent, the addition of chloride solid is 3% of adhesive solid gross mass.
8. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 3, is characterized in that: described preparation technology also comprises precompressed, heat-press step.
9. the preparation technology of the glued board of a kind of sandwich layer super thick as claimed in claim 3, it is characterized in that: in described precompressed, heat-press step: hot pressing temperature is: 120 DEG C ~ 145 DEG C, pressure is high pressure: 10 ~ 12 MPa, and the time is: 15 ~ 25 minutes.
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