CN104626292B - One can facing oriented wood chipboard and preparation technology thereof - Google Patents

One can facing oriented wood chipboard and preparation technology thereof Download PDF

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Publication number
CN104626292B
CN104626292B CN201510061938.9A CN201510061938A CN104626292B CN 104626292 B CN104626292 B CN 104626292B CN 201510061938 A CN201510061938 A CN 201510061938A CN 104626292 B CN104626292 B CN 104626292B
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layer
sandwich layer
raw
wood chipboard
oriented wood
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CN104626292A (en
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钟笃章
国智武
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Shouguang Luli Wood Co Ltd
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Shouguang Luli Wood Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/10Moulding of mats
    • B27N3/14Distributing or orienting the particles or fibres
    • B27N3/143Orienting the particles or fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08Moulding or pressing
    • B27N3/20Moulding or pressing characterised by using platen-presses
    • B27N3/203Moulding or pressing characterised by using platen-presses with heating or cooling means
    • 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
    • B32B21/02Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • 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
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284Application of adhesive

Abstract

The present invention relates to one can facing oriented wood chipboard and preparation technology thereof, sandwich layer and top layer can be comprised by facing oriented wood chipboard, core layer raw material selects remaining rotary cut venner leftover bits and pieces in plywood production process, top layer raw material choose integrated timber, core-board, the sawdust produced in particieboard or MDF production process, wood shavings, useless fiber, sanding powder, described raw material drying, screening, applying glue, mat formation, slab saw is cut out and obtained after hot pressing can facing oriented wood chipboard, the MOR of oriented wood chipboard parallel direction can reach 22 ~ 30MPa, elastic modelling quantity can reach 3500 ~ 4800MPa, surface roughness is less than 0.8 μm, processing facing can be directly used in, extensively can also replace glued board, core-board, particieboard, the wood-based plates such as MDF.

Description

One can facing oriented wood chipboard and preparation technology thereof
Technical field
The present invention relates to a kind of particieboard and preparation technology thereof, be applicable to oriented wood chipboard, be particularly useful for the oriented wood chipboard higher to top layer sophistication requirement, specifically, relating to one can facing oriented wood chipboard and preparation technology thereof, belongs to particieboard technical field.
Background technology
Oriented wood chipboard is one of particieboard new varieties.When wood shavings are mated formation shaping, glue mixing wood shavings arrange by its machine direction stringer by two top layers up and down of oriented wood chipboard, and sandwich layer wood shavings are transversely arranged, composition three-decker plate embryo, and then oriented wood chipboard is made in hot pressing.The wood shavings shape need length-width ratio of this particieboard is comparatively large, and the wood shavings of Thickness Ratio ordinary particle board are slightly thick.
Oriented wood chipboard is that log is through removing the peel, being cut into the flaking with certain geometrical shape along grain direction, flaking size is generally long 40 ~ 140mm, wide 5 ~ 20mm, thick 0.40 ~ 0.60mm, drying apply synthetic resin gum and waterproofing agent again, the fiber direction of simulation natural timber becomes after slab through orienting spreading, then through a kind of artificial engineering structural panel that high temperature hot pressing is made.
The shape of oriented wood chipboard watch core layer wood shavings, size is the same, just adopt orienting spreading, sandwich layer wood shavings are transversely arranged, top layer wood shavings longitudinal arrangement, watch core layer wood shavings form certain directed angle, thus make the mechanical property of oriented wood chipboard all directions identical, it is high that the orienting spreading of oriented wood chipboard makes oriented wood chipboard have intensity, good stability of the dimension, the features such as good processability, the advantage of glued board and ordinary particle board is united two into one, both the wooden unit having merged glued board is longer, well arranged, feature arranged in a uniform, drawn again ordinary particle board process simple and easy to operate simultaneously, the feature be produced on a large scale, normal replacement glued board does structural wood and uses.
But such oriented wood chipboard has two limitation, and first aspect prepared by raw material, oriented wood chipboard requires comparatively large because of Flake geometry, and the former size class therefore needed can not be too small, generally at more than 60mm, need be prepared into wood shavings after peeling.In the purchasing of raw materials, have certain restriction like this, the more general small dimension wood of price wants high, improves the cost of the purchasing of raw materials, thus makes board cost higher.
Secondly, because top layer Flake geometry is larger, little with sandwich layer wood shavings difference, the sheet material panel made is uneven, as interior decoration or manufacture furniture, after need secondary operations surface treatment being carried out, just can carry out facing decoration, as sanding, the certain thickness veneer of Double-face adhesive etc., the processing cost in later stage can be improved like this, too increase manufacturing procedure, limit the scope that it uses to a certain extent.
Above 2 make, at present when wood-based plate Market competition, to limit its scope of application, reduce the market competitiveness.Along with the fierceness day by day of wood-based plate market competition, the above deficiency that common oriented wood chipboard exists is badly in need of being resolved.
Chinese patent CN201110084640 discloses a kind of to particieboard and preparation technology.Oriented wood chipboard described in this invention is by adhesive bond three-decker together, comprises upper and lower two top layers and a middle sandwich layer; Described preparation technology for raw material, replaces path dimension stock with rotary cut venner leftover bits and pieces remaining in plywood production process, and its table, sandwich layer take all waste single boards as raw material, cannot solve the problem of oriented wood chipboard surface irregularity.
Chinese patent CN201220536276 discloses a kind of production method of extraordinary oriented wood chipboard.Extraordinary oriented wood chipboard described in this invention comprises top layer, sandwich layer and bottom, and described bottom, sandwich layer and top layer are arranged in order from bottom to top through glue is glued together, and described bottom and top layer are wood wool; The raw material of what this extraordinary oriented wood chipboard used be ordinary particle board, large wood shavings and wood shavings in small, broken bits are obtained for comprehensive utilization, improve the utilization rate of timber, save timber, and wood shavings in small, broken bits are used for top layer, the top finishing performance of enhancing sheet material.This production method still uses common raw material, and core layer raw material source is still small diameter grade dimension stock, cannot reduce costs.Top layer uses the raw material of ordinary particle board, still needs to carry out raw material preparation, and uses wood shavings to be raw material, cannot reach the quality requirement that oriented wood chipboard top layer is fine and close, fine and smooth.
Summary of the invention
The problem to be solved in the present invention is for above deficiency, provides one can facing oriented wood chipboard, have top layer compact, fine and smooth, surface flatness can be better than medium density fibre board (MDF), and surface roughness is less than 0.8 μm, is smooth to the touch; Intensity is high, and MOR, elastic modelling quantity all exceed particieboard and the medium density fibre board (MDF) more than 15% of same size, and the MOR of oriented wood chipboard parallel direction can reach 22 ~ more than 30MPa, and elastic modelling quantity can reach 3500 ~ more than 4800MPa; Good stability of the dimension, thickness swelling rate comparatively same size particieboard and medium density fibre board (MDF) low by 20%; Good processability, can be used for the Surface Machining such as veneer overlay, facing paper veneer, directly japanning; The advantage that applicability is wide, can be used for furniture, wooden building, interior decoration, car and boat interior trim etc.; Processing facing can be directly used in, can also extensively replace the wood-based plates such as glued board, core-board, particieboard, MDF.
Simultaneously, the present invention also provides a kind of preparation technology of oriented wood chipboard, adopt preparation technology of the present invention, sandwich layer adopts rotary cut venner waste material to be raw material, top layer uses sawdust, the wood shavings produced in the building board production process such as integrated timber, core-board, particieboard, MDF, the waste material such as fiber, sanding powder that gives up is raw material, improves the utilization rate of timber, saves timber resources, cost of material is low, can reduce at least 50%; Manufacturing procedure is simple, rationally, processing cost is low, and energy consumption reduces at least 10%, and cost of labor reduces at least 5%, and crudy is high, is applicable to suitability for industrialized production.
For overcoming the above problems, the present invention by the following technical solutions: one can facing oriented wood chipboard, comprises sandwich layer and top layer, it is characterized in that: top layer and sandwich layer wood shavings form the directed angle of 60 ° ~ 90 °.
A kind of prioritization scheme, the MOR of described oriented wood chipboard parallel direction can reach 22 ~ 30MPa, and elastic modelling quantity can reach 3500 ~ 4800MPa;
Described oriented wood chipboard surface roughness is less than 0.8 μm.
Can the preparation technology of facing oriented wood chipboard, comprise the following steps:
1) raw material preparation;
2) raw material drying;
3) raw material screening;
4) applying glue;
5) mat formation;
6) slab saw is cut out;
7) hot pressing.
A kind of prioritization scheme, described raw material preparation comprises the preparation of sandwich layer and top layer raw material;
Core layer raw material selects remaining rotary cut venner leftover bits and pieces in plywood production process;
The sawdust produced in top layer raw material choose integrated timber, core-board, particieboard or MDF production process, wood shavings, useless fiber, sanding powder.
Another kind of prioritization scheme, described applying glue step comprises:
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies melamine adhesive, and resin added is 5% ~ 9%, and sandwich layer applies modified urea-formaldehyde resin adhesive, and applied amount is 4% ~ 8%.
Another prioritization scheme, described applying glue step comprises:
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies MDI isocyanate adhesive, and resin added is 4% ~ 8%, and sandwich layer applies MDI isocyanate adhesive, and applied amount is 3% ~ 6%.
Further prioritization scheme, described applying glue step comprises:
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies synvaren, and resin added is 5% ~ 8%, and sandwich layer applies synvaren, and applied amount is 4% ~ 7%.
Further prioritization scheme, described in step of mating formation comprise:
Material after applying glue step being completed is mated formation by five layers of spreading head, its center core layer is divided into three-decker, comprise sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer, to mat formation core material, sandwich layer intermediate layer is for laterally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, for longitudinally mating formation, the upper and lower Surface pavement top layer wood shavings of sandwich layer, obtain slab.
Further prioritization scheme, described heat-press step comprises:
Slab after being cut out by saw adopts the hot pressing of continous way spreader bar, press length is 39.5m, hot pressing temperature is followed successively by 220 ~ 250 DEG C, 200 ~ 230 DEG C, 200 ~ 230 DEG C, 190 ~ 220 DEG C, 160 ~ 180 DEG C, the hot pressing factor 5 ~ 8s/mm, pressure is followed successively by 1.2 ~ 1.6MPa, 0.8 ~ 1.5MPa, 0.8 ~ 1.0MPa, 0.2 ~ 0.6MPa, 0.6 ~ 1.0MPa, five sections of pressure curves carry out hot pressing.
Further prioritization scheme, when top layer applies MDI isocyanate adhesive, first to press steel belt spraying remover, then carries out hot pressing.
The present invention adopts above technical scheme, compared with prior art, tool has the following advantages: described oriented wood chipboard sandwich layer uses rotary cut venner waste material to be raw material, top layer uses sawdust, the wood shavings produced in the building board production process such as integrated timber, core-board, particieboard, MDF, the waste material such as fiber, sanding powder that gives up is raw material, coordinate specific preparation process and parameter, the oriented wood chipboard top layer of producing is fine and close, fine and smooth, and surface flatness can reach suitable with medium density fibre board (MDF); Intensity is high, and MOR, elastic modelling quantity all exceed particieboard and the medium density fibre board (MDF) more than 15% of same size, and the MOR of oriented wood chipboard parallel direction can reach 22 ~ more than 30MPa, and elastic modelling quantity can reach 3500 ~ more than 4800MPa; Good stability of the dimension, thickness swelling rate comparatively same size particieboard and medium density fibre board (MDF) low by 20%; Good processability, can be used for the Surface Machining such as veneer overlay, facing paper veneer, directly japanning; The advantage that applicability is wide, can be used for furniture, wooden building, interior decoration, car and boat interior trim etc., can adapt to various different processing mode, and applicability is wide, can extensively replace the wood-based plates such as glued board, core-board, particieboard, MDF.
The production technology Raw of described oriented wood chipboard all adopts various wood machining residues; effectively utilize the waste material in timber process; form the zero-emission of timber waste; cost of material reduces about 50%; both resource had been saved; protect environment again; in today that wood raw material lacks day by day; be the Resource comprehensive utilization method that a kind of benefit is very high, and manufacturing procedure is simple, rationally, processing cost is low; energy consumption reduces at least 10%; cost of labor reduces at least 5%, and crudy is high, is applicable to suitability for industrialized production.
Below in conjunction with embodiment, the present invention is described in detail.
Detailed description of the invention
Embodiment 1, one can facing oriented wood chipboard, and comprise sandwich layer and top layer, top layer comprises upper epidermis and layer, and upper epidermis is connected with the upper surface of sandwich layer, and layer is connected with the lower surface of sandwich layer.
Sandwich layer wood shavings are transversely arranged, top layer wood shavings longitudinal arrangement, and top layer and sandwich layer wood shavings form the directed angle of 60 ° ~ 90 °.
Described sandwich layer accounts for 70% ~ 80% of oriented wood chipboard gross thickness, and top layer accounts for 30% ~ 20% of oriented wood chipboard gross thickness.
The preparation technology of described oriented wood chipboard comprises the following steps:
1) raw material preparation.
(1) core layer raw material preparation.
In plywood production process, remaining rotary cut venner leftover bits and pieces is 15% ~ 30% through the naturally ventilated moisture content that is dried to of preliminary airing, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm, wood shavings are transported to wet wood shavings feed bin through belt conveyer and store.
(2) top layer raw material preparation.
The sawdust produced in the building board production process such as integrated timber, core-board, particieboard, MDF, wood shavings, the useless waste material such as fiber, sanding powder are through collecting, the naturally ventilated moisture content that is dried to of preliminary airing is 15% ~ 30%, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm.
Be that the ratio of 1:3 together be delivered to wet wood shavings feed bin for subsequent use by top layer and sandwich layer according to weight ratio according to need of production.
2) raw material drying.
By the raw material prepared in step 1) by blower fan Geldart-D particle to single channel roller drier, use the mixed flue gas of 400 ~ 500 DEG C to carry out drying to raw material, drying time 5 ~ 8s, after dry, material water ratio is 2% ~ 4%.
3) raw material screening.
By mechanical grading, sandwich layer is separated with skin-material, and removes the impurity such as metallics, sandstone, plastics contained in raw material.
4) applying glue.
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies melamine adhesive, and resin added is 5% ~ 9%, and sandwich layer applies modified urea-formaldehyde resin adhesive, and applied amount is 4% ~ 8%.
5) mat formation.
Material after applying glue step being completed is mated formation by five layers of spreading head, its center core layer is divided into three-decker, comprise sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer, to mat formation core material, sandwich layer intermediate layer is for laterally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, for longitudinally mating formation, the upper and lower Surface pavement skin-material of sandwich layer, obtains slab.
6) slab saw is cut out.
After mating formation, slab is by preformer compacting, then is cut into the width of plate slab of needs through slab edge saw.
7) hot pressing.
Slab after being cut out by saw adopts the hot pressing of continous way spreader bar, press length is 39.5m, hot pressing temperature is followed successively by 220 ~ 250 DEG C, 200 ~ 230 DEG C, 200 ~ 230 DEG C, 190 ~ 220 DEG C, 160 ~ 180 DEG C, the hot pressing factor 5 ~ 8s/mm, pressure is followed successively by 1.2 ~ 1.6MPa, 0.8 ~ 1.5MPa, 0.8 ~ 1.0MPa, 0.2 ~ 0.6MPa, 0.6 ~ 1.0MPa, five sections of pressure curves carry out hot pressing.
8) post processing.
Production board after hot pressing is transversal, turnover panel cooling, ageing storage, specification cut out plate, inspection grade and pack warehouse-in.
The oriented wood chipboard adopting the preparation technology of the present embodiment to obtain is mainly used in the environmental protection of general room type can facing oriented wood chipboard.
The detection method that oriented wood chipboard prepared by the present embodiment specifies according to GB/T17657 detects, and obtains property indices and sees the following form:
Table 1: the environmental protection of general room type can facing oriented wood chipboard performance indications
Embodiment 2, one can facing oriented wood chipboard, and comprise sandwich layer and top layer, top layer comprises upper epidermis and layer, and upper epidermis is connected with the upper surface of sandwich layer, and layer is connected with the lower surface of sandwich layer.
Sandwich layer wood shavings are transversely arranged, top layer wood shavings longitudinal arrangement, and top layer and sandwich layer wood shavings form the directed angle of 60 ° ~ 90 °.
Described sandwich layer accounts for 70% ~ 80% of oriented wood chipboard gross thickness, and top layer accounts for 30% ~ 20% of oriented wood chipboard gross thickness.
The preparation technology of described oriented wood chipboard comprises the following steps:
1) raw material preparation.
(1) core layer raw material preparation.
In plywood production process, remaining rotary cut venner leftover bits and pieces is 15% ~ 30% through the naturally ventilated moisture content that is dried to of preliminary airing, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm, wood shavings are transported to wet wood shavings feed bin through belt conveyer and store.
(2) top layer raw material preparation.
The sawdust produced in the building board production process such as integrated timber, core-board, particieboard, MDF, wood shavings, the useless waste material such as fiber, sanding powder are through collecting, the naturally ventilated moisture content that is dried to of preliminary airing is 15% ~ 30%, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm.
Be that the ratio of 1:3 together be delivered to wet wood shavings feed bin for subsequent use by top layer and sandwich layer according to weight ratio according to need of production.
2) raw material drying.
By the raw material prepared in step 1) by blower fan Geldart-D particle to single channel roller drier, use the mixed flue gas of 400 ~ 500 DEG C to carry out drying to raw material, drying time 5 ~ 8s, after dry, material water ratio is 8% ~ 11%.
3) raw material screening.
By mechanical grading, sandwich layer is separated with skin-material, and removes the impurity such as metallics, sandstone, plastics contained in raw material.
4) applying glue.
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies MDI isocyanate adhesive, and resin added is 4% ~ 8%, and sandwich layer applies MDI isocyanate adhesive, and applied amount is 3% ~ 6%.
5) mat formation.
Material after applying glue step being completed is mated formation by five layers of spreading head, its center core layer is divided into three-decker, comprise sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer, to mat formation core material, sandwich layer intermediate layer is for laterally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, for longitudinally mating formation, the upper and lower Surface pavement skin-material of sandwich layer, obtains slab.
6) slab saw is cut out.
After mating formation, slab is by preformer compacting, then is cut into the width of plate slab of needs through slab edge saw.
7) hot pressing.
Slab after being cut out by saw adopts the hot pressing of continous way spreader bar, press steel belt spraying remover is to prevent MDI isocyanate adhesive steel bonding band, press length is 39.5m, hot pressing temperature is followed successively by 220 ~ 250 DEG C, 200 ~ 230 DEG C, 200 ~ 230 DEG C, 190 ~ 220 DEG C, 160 ~ 180 DEG C, the hot pressing factor 5 ~ 8s/mm, pressure is followed successively by 1.2 ~ 1.6MPa, 0.8 ~ 1.5MPa, 0.8 ~ 1.0MPa, 0.2 ~ 0.6MPa, 0.6 ~ 1.0MPa, five sections of pressure curves carry out hot pressing.
8) post processing.
Production board after hot pressing is transversal, turnover panel cooling, ageing storage, specification cut out plate, inspection grade and pack warehouse-in.
The oriented wood chipboard adopting the preparation technology of the present embodiment to obtain is mainly used in zero formaldehyde water proof type can facing oriented wood chipboard.
The detection method that oriented wood chipboard prepared by the present embodiment specifies according to GB/T17657 detects, and obtains property indices and sees the following form:
Table 2: zero formaldehyde water proof type can facing oriented wood chipboard performance indications
Embodiment 3, one can facing oriented wood chipboard, and comprise sandwich layer and top layer, top layer comprises upper epidermis and layer, and upper epidermis is connected with the upper surface of sandwich layer, and layer is connected with the lower surface of sandwich layer.
Sandwich layer wood shavings are transversely arranged, top layer wood shavings longitudinal arrangement, and top layer and sandwich layer wood shavings form the directed angle of 60 ° ~ 90 °.
Described sandwich layer accounts for 70% ~ 80% of oriented wood chipboard gross thickness, and top layer accounts for 30% ~ 20% of oriented wood chipboard gross thickness.
The preparation technology of described oriented wood chipboard comprises the following steps:
1) raw material preparation.
(1) core layer raw material preparation.
In plywood production process, remaining rotary cut venner leftover bits and pieces is 15% ~ 30% through the naturally ventilated moisture content that is dried to of preliminary airing, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm, wood shavings are transported to wet wood shavings feed bin through belt conveyer and store.
(2) top layer raw material preparation.
The sawdust produced in the building board production process such as integrated timber, core-board, particieboard, MDF, wood shavings, the useless waste material such as fiber, sanding powder are through collecting, the naturally ventilated moisture content that is dried to of preliminary airing is 15% ~ 30%, by desintegrator and chipper flaking, make long 40 ~ 140mm, wide 5 ~ 20mm, the wood shavings of thick 0.20 ~ 0.60mm.
Be that the ratio of 1:3 together be delivered to wet wood shavings feed bin for subsequent use by top layer and sandwich layer according to weight ratio according to need of production.
2) raw material drying.
By the raw material prepared in step 1) by blower fan Geldart-D particle to single channel roller drier, use the mixed flue gas of 400 ~ 500 DEG C to carry out drying to raw material, drying time 5 ~ 8s, after dry, material water ratio is 2% ~ 4%.
3) raw material screening.
By mechanical grading, sandwich layer is separated with skin-material, and removes the impurity such as metallics, sandstone, plastics contained in raw material.
4) applying glue.
Adopt mechanical type glue mixing to carry out applying glue to top layer and sandwich layer respectively, top layer applies synvaren, and resin added is 5% ~ 8%, and sandwich layer applies synvaren, and applied amount is 4% ~ 7%.
5) mat formation.
Material after applying glue step being completed is mated formation by five layers of spreading head, its center core layer is divided into three-decker, comprise sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer, to mat formation core material, sandwich layer intermediate layer is for laterally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, for longitudinally mating formation, the upper and lower Surface pavement skin-material of sandwich layer, obtains slab.
6) slab saw is cut out.
After mating formation, slab is by preformer compacting, then is cut into the width of plate slab of needs through slab edge saw.
7) hot pressing.
Slab after being cut out by saw adopts the hot pressing of continous way spreader bar, press length is 39.5m, hot pressing temperature is followed successively by 220 ~ 250 DEG C, 200 ~ 230 DEG C, 200 ~ 230 DEG C, 190 ~ 220 DEG C, 160 ~ 180 DEG C, the hot pressing factor 5 ~ 8s/mm, pressure is followed successively by 1.2 ~ 1.6MPa, 0.8 ~ 1.5MPa, 0.8 ~ 1.0MPa, 0.2 ~ 0.6MPa, 0.6 ~ 1.0MPa, five sections of pressure curves carry out hot pressing.
8) post processing.
Production board after hot pressing is transversal, turnover panel cooling, ageing storage, specification cut out plate, inspection grade and pack warehouse-in.
The oriented wood chipboard adopting the preparation technology of the present embodiment to obtain is mainly used in outdoor ageing-resistant waterproof type can facing oriented wood chipboard.
The detection method that oriented wood chipboard prepared by this example specifies according to GB/T17657 detects, and obtains property indices and sees the following form:
Table 3: outdoor ageing-resistant waterproof type can facing oriented wood chipboard performance indications
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 (6)

1. can a facing oriented wood chipboard, comprise sandwich layer and top layer, it is characterized in that:
Top layer and sandwich layer wood shavings form the directed angle of 60 ° ~ 90 °;
Sandwich layer wood shavings are transversely arranged, top layer wood shavings longitudinal arrangement;
The sawdust produced in top layer raw material choose integrated timber, core-board, particieboard or MDF production process, wood shavings, useless fiber, sanding powder;
Its center core layer is divided into three-decker, comprises sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer,
Top layer comprises upper epidermis and layer;
Mechanical type glue mixing is adopted to carry out applying glue to top layer and sandwich layer respectively;
Top layer applies melamine adhesive, and resin added is 5% ~ 9%, and sandwich layer applies modified urea-formaldehyde resin adhesive, and applied amount is 4% ~ 8%;
Or top layer applies MDI isocyanate adhesive, and resin added is 4% ~ 8%, sandwich layer applies MDI isocyanate adhesive, and applied amount is 3% ~ 6%;
Or top layer applies synvaren, and resin added is 5% ~ 8%, sandwich layer applies synvaren, and applied amount is 4% ~ 7%;
The MOR of described oriented wood chipboard parallel direction is 22 ~ 30MPa, and elastic modelling quantity is 3500 ~ 4800MPa;
Described oriented wood chipboard surface roughness is less than 0.8 μm.
2. a kind of as claimed in claim 1 can the preparation technology of facing oriented wood chipboard, it is characterized in that: described preparation technology comprises the following steps:
1) raw material preparation;
2) raw material drying;
3) raw material screening;
4) applying glue;
5) mat formation;
6) slab saw is cut out;
7) hot pressing.
3. a kind of as claimed in claim 2 can the preparation technology of facing oriented wood chipboard, it is characterized in that: described raw material preparation comprises the preparation of sandwich layer and top layer raw material;
Core layer raw material selects remaining rotary cut venner leftover bits and pieces in plywood production process.
4. a kind of as claimed in claim 3 can the preparation technology of facing oriented wood chipboard, it is characterized in that: described in step of mating formation comprise:
Material after applying glue step being completed is mated formation by five layers of spreading head, core material of mating formation, and sandwich layer intermediate layer is for laterally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, and for longitudinally mating formation, the upper and lower Surface pavement top layer wood shavings of sandwich layer, obtain slab.
5. a kind of as claimed in claim 3 can the preparation technology of facing oriented wood chipboard, it is characterized in that: described heat-press step comprises:
Slab after being cut out by saw adopts the hot pressing of continous way spreader bar, press length is 39.5m, hot pressing temperature is followed successively by 220 ~ 250 DEG C, 200 ~ 230 DEG C, 200 ~ 230 DEG C, 190 ~ 220 DEG C, 160 ~ 180 DEG C, the hot pressing factor 5 ~ 8s/mm, pressure is followed successively by 1.2 ~ 1.6MPa, 0.8 ~ 1.5MPa, 0.8 ~ 1.0MPa, 0.2 ~ 0.6MPa, 0.6 ~ 1.0MPa, five sections of pressure curves carry out hot pressing.
6. a kind of as claimed in claim 3 can the preparation technology of facing oriented wood chipboard, it is characterized in that: described heat-press step also comprises: press steel belt spraying remover.
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