CN106272873A - A kind of preparation method of oriented multilayer wood-plastic clad plate - Google Patents
A kind of preparation method of oriented multilayer wood-plastic clad plate Download PDFInfo
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- CN106272873A CN106272873A CN201610813575.4A CN201610813575A CN106272873A CN 106272873 A CN106272873 A CN 106272873A CN 201610813575 A CN201610813575 A CN 201610813575A CN 106272873 A CN106272873 A CN 106272873A
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- wood
- clad plate
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- oriented
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE 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
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE 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
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE 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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0218—Mixing the material with binding agent in rotating drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE 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
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2200/00—Wooden materials to be treated
- B27K2200/15—Pretreated particles or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
- B27K2240/10—Extraction of components naturally occurring in wood, cork, straw, cane or reed
Abstract
A kind of preparation method of oriented multilayer wood-plastic clad plate, the present invention solves because wood material size is little, content is low, the uneven utilization of resources brought of Vertical density gradient is unreasonable, production cost is high, energy consumption is big, the problem of wood-plastic clad plate comprehensive mechanical property difference present in prior art wood-plastic clad plate preparation process, and then propose the preparation method of a kind of oriented multilayer wood-plastic clad plate.The present invention is with large scale wood particle and thermoplastic plastic foil as primary raw material, plastic tab is used after mixing, to be layered the production technology of orienting spreading with large scale wood particle again, overcome Traditional Wood plastic composite materials preparation technology and the defect of product, can prepare that wood material size is big, content is high, the large format orientation wood-plastic clad plate that product physical and mechanical property is good.
Description
Technical field
The present invention relates in the preparation method of a kind of wood plastic composite, be specifically related to a kind of oriented multilayer wood-plastic clad plate
Preparation method, the especially preparation method of large scale wood particle oriented multilayer wood-plastic clad plate.
Background technology
Wood plastic composite is one of fastest-rising advanced polymer composites of field of compound material.Extrusion, injection
It is three kinds of main methods producing wood plastic composite with hot pressing, but extrusion and injection limits the size of its product,
Therefore pressure sintering is the best practice producing large format wood plastic composite.
The wooden raw-material size of existing wood plastic composite manufacturing requirements is sufficiently small, industry generally use 40～
The powdery wood fibre of 100 mesh, raw-material pulverizing not only increases energy consumption, and is the source of dust pollution and sound pollution
Spring.Use large scale raw material, the prototype structure of raw material can be kept to be destroyed less, thus be conducive to increasing the properties of product,
And the effect of energy-saving and noise-reducing can be played.
The primary raw material of wood plastic composite includes wood material and plastics, and on cost, the price of plastics is higher than wooden
The price of raw material, because in a little raising products, the content of wood material can reduce the cost of product.But, existing wood and plastic composite
In material, the mass fraction of wood material is typically 20% to 70%, and when wood material content is higher than 70%, wood material mixes with plastics
The poor fluidity of compound, relatively big with the frictional resistance of equipment tube wall, cause the defects such as product lack of homogeneity and face checking, therefore
How to improve the content of wood material in wood plastic composite by new technique and become emphasis and the focus of research.
During conventional thermal platen press produces wood-plastic composite (WPC), the density of plastic grain is close more than wood material
Degree, thus in mixed process, the fiber that plastics that density is big are little with density is difficult to mix homogeneously, and is even mating formation and hot pressing
Cheng Zhong, the plastic grain that density is big will be slided leakage to the bottom of slab, thus caused plastic content and density in product thickness direction
Upper skewness.Although long size wood material be conducive to increase final products performance, but use grain plastic cause upper
State sliding leakage and skewness phenomenon becomes apparent from.Chinese invention patent CN103659946 disclosed orientation wood-plastic clad plate, it uses
Plastic sheeting substituted for plastic granule avoids the sliding leakage of grain plastic to a certain extent, but plastic sheeting is moulded multiple being used for manufacturing wood
Easily occur during plywood material assembling on the thickness direction of slab, thus undaform end face distribution (VDP) can be formed, the most equally
It is difficult to prepare homogeneous wood-plastic composite panel.
Summary of the invention
In order to overcome present in prior art wood-plastic clad plate preparation process because wood material size is little, content is low, mould
The utilization of resources that material and Density Distribution inequality are brought is unreasonable, energy expenditure big, the problem of Wood plastic boards comprehensive mechanical property difference,
Disclosure sets forth the hot pressing method for preparing of a kind of large scale wood particle oriented multilayer wood-plastic clad plate, with the wooden plane of large scale
Flower and thermoplastic plastic foil are primary raw material, the most multi-layer oriented paving after using plastic tab to mix with large scale wood particle
The production technology of dress, overcomes Traditional Wood plastic composite materials preparation technology and the defect of product, prepares that wood material size is big, content
Height, the large format orientation wood-plastic clad plate that product physical and mechanical property is good, this sheet material has in building, furniture and packaging material field
It is widely applied potentiality.
The technical solution adopted in the present invention is: the preparation method of a kind of oriented multilayer wood-plastic clad plate, including following step
Rapid:
(1) get the raw materials ready: by timber and straw by flaking, chip, roll, one or more modes in sawing and screening are processed into
Long by 20～200mm, wide 2～20mm, the wood material of thick 0.1～2mm；Owing to timber size is big, by sawing, flaking with chip
Mode is processed as veneer sheet-shaped material；It, if any juice, other branch and leaf, is squeezed and removes by straw, by sawing and
The mode of rolling is processed into elongated wood shavings；Wood material after above-mentioned processing, as containing tiny fiber, is removed by screening；
(2) pretreatment of raw material: wood material is carried out high temperature drying or hot-water extraction processes or combination, and by wooden former
The moisture content of material is dried to less than 5%, reduces the surface energy of wood material simultaneously；Hot-water extraction can be by the portion in wood material
Divide hemicellulose and lignin extraction out, thus increase the infiltration of the voidage within wood material, beneficially plastics and fill out
Fill；High temperature drying makes the lignin in wood materials and hemicellulose generation thermal degradation, is also beneficial to increase the sky within raw material
Gap rate；Owing to plastics do not engage with water, the moisture content reducing wood material is conducive to increase wood material to connect with the interface of plastics
Close；
(3) plastic tab is prepared: it is 0.02～0.8mm, a length of 50～120mm, width that thermoplastics processing becomes thickness
It it is the plastic tab of 10～25mm；
(4) coupling agent is added: use spraying method to be applied to by the liquid coupling agent accounting for orientation wood-plastic clad plate quality 0.5～4%
On pretreated wood material；Liquid coupling agent can be chosen to be isocyanate coupler；
(5) cylinder mixing: oriented multilayer wood-plastic clad plate quality 5～the described thermoplastic plastic foil of 30% and described wood will be accounted for
Raw material is collectively disposed at mix homogeneously in cylinder, it is thus achieved that raw mixture；
(6) multi-layer oriented mat formation: carry out raw mixture being layered orienting spreading, it is thus achieved that multiple-layer stacked orientation slab；At slab
Upper layer place processing release paper, prevent haftplatte in slab hot pressing；
(7) hot pressing and colding pressing: multiple-layer stacked is oriented slab and puts in flat-bed press at 120～220 DEG C hot pressing 3～20 points
Clock, is passed through 5～25 DEG C of cold water to hot press heating plate afterwards or proceeds to slab cold pressing to room temperature press, treating slab temperature
Degree is down to when 50～60 DEG C take out；In hot pressing, plastic tab melted by heat, flows under the effect of the pressure and fills wooden
Space between raw material and wood material within, cools and solidifies afterwards in cold pressure procedure, thus plastics and wood material it
Between form stronger mechanical interlocked combination；
(8) post-production: display after carrying out cutting edge and surface process.
Preferably: orienting spreading described in (6th) step includes step in detail below:
A, orienting spreading bottom: raw mixture is oriented acquisition of mating formation there is certain thickness orienting spreading bottom；
B, orienting spreading last layer: on described orienting spreading bottom, change orienting spreading direction, with described orienting spreading bottom
The perpendicular relation of angle continues superposition orienting spreading last layer；
C, completing slab orienting spreading: repeat b step several times, until completing to have mating formation of certain thickness and the number of plies, then entering
Mating formation in row top layer, is finally completed plate blank paving.
Preferably: the thickness of multi-layer oriented middle monolayer of mating formation described in adjustable during orienting spreading described in (6th) step, and
Described multi-layer oriented mat formation in the number of plies mated formation be odd-level.
Preferably: wood material described in (1st) step is divided into wood-based wood material and stalk base wood raw material；The
(6) the multi-layer oriented bottom mated formation described in step and top layer use for wood-based wood material, remainder layer use for straw
Sill raw material.
Preferably: in step (6), raw mixture is oriented to mat formation and refers to mutually be overlapped by raw mixture and fold
Add, mat formation with axially becoming 0～30 degree of angle with raw mixture length direction.
Preferably: thermoplastic plastic foil described in (5th) step is collectively disposed at tiltedly with the wood material of orienting spreading
In axle cylinder, mix, to mix homogeneously with per minute 10 speed going to 60 turns.
Preferably: described in (6th) step multi-layer oriented mat formation in each layer orientation direction of raw mixture when mating formation
Being parallel or perpendicular to slab axial, overlaying structure is symmetrical at slab central plane simultaneously.
Preferably: the thermoplastic described in (6th) step is high density polyethylene (HDPE), Low Density Polyethylene, high density
Polypropylene, polrvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene resin, nylon, polylactic acid, polyhydroxyalkanoate
In one or more.
Preferably: described thermoplastic is virgin material or the waste material of recovered acquisition or combination.
Preferably: described in (6th) step, orient the breadth a length of 400～2440mm of slab, width be 400～
1220mm；Multiple-layer stacked is oriented slab when putting in flat-bed press described in (7th) step, limit flat-bed press pressing plate
Thickness be 6～55mm.
Use the method for the invention can improve the usage amount of wood material, it is achieved the big use of little material, the excellent use of bad material, available
In preparing high performance wood plastic composite, wood material and plastics are evenly dispersed simultaneously, and interior mechanics performance is more stable, has
Imitate avoids plastic sheeting gathering and the undaform Vertical density gradient that slab thickness direction easily occurs, overcomes prior art
Present in wood-plastic clad plate preparation process because wood material size is little, content is low, the money brought of plastics and Density Distribution inequality
Source utilizes problem unreasonable, that energy expenditure big, Wood plastic boards comprehensive mechanical property is poor.
Accompanying drawing explanation
Fig. 1 is the preparation section of oriented multilayer wood-plastic clad plate.
Fig. 2 is that orientation wood-plastic clad plate oriented multilayer is mated formation structure of plate slab schematic diagram.
Fig. 3 is the slab schematic diagram after wood-plastic clad plate oriented multilayer has been mated formation.
Detailed description of the invention
The detailed description of the invention of the present invention is described below in conjunction with the accompanying drawings.
Detailed description of the invention 1: combine Fig. 1 and present embodiment is described, described in present embodiment, a kind of oriented multilayer wood is moulded multiple
The preparation method of plywood comprises the following steps:
Step one, get the raw materials ready: by timber and straw by flaking, chip, roll, one or more modes in sawing and screening add
Work growth 20～200mm, wide 2～20mm, the wood material of thick 0.1～2mm；
Step 2, pretreatment of raw material: wood material is carried out high temperature drying or hot-water extraction processes or combination, and by wood
The moisture content of raw material is dried to less than 5%, reduces the surface energy of wood material simultaneously；
Step 3, prepare plastic tab: thermoplastics processing is become thickness be 0.02～0.8mm, a length of 50～120mm,
Width is the plastic tab of 10～25mm；
Step 4, add coupling agent: use spraying method to be executed by the liquid coupling agent accounting for orientation wood-plastic clad plate quality 0.5～4%
It is added on pretreated wood material；
Step 5, cylinder mix: will account for oriented multilayer wood-plastic clad plate quality 5～the described thermoplastic plastic foil of 30% and institute
State wood material and be collectively disposed at mix homogeneously in cylinder, it is thus achieved that raw mixture；
Step 6, multi-layer oriented mat formation: carry out raw mixture being layered orienting spreading, it is thus achieved that multiple-layer stacked orientation slab；
Step 7, hot pressing and cold pressing: multiple-layer stacked is oriented slab put in flat-bed press at 120～220 DEG C hot pressing 3～
20 minutes, it is passed through 5～25 DEG C of cold water to hot press heating plate afterwards or proceeds to slab cold pressing to room temperature press, treating plate
Base temperature is down to when 50～60 DEG C take out；
Step 8, post-production: display after carrying out cutting edge and surface process.
Wood material and plastic tab have been carried out getting the raw materials ready due to the present invention and have located in advance by having the technical effect that of present embodiment
Reason, and obtain uniform raw material through cylinder mixing, then carry out this uniform raw material multi-layer oriented mating formation so that with described side
Method can improve the usage amount of wood material, it is achieved the big use of little material, the excellent use of bad material, can be used for preparing high performance wood and plastic composite
Material；Simultaneously because wood material and plastics are evenly dispersed, interior mechanics performance is more stable, effectively avoids slab thickness side
Assemble and undaform Vertical density gradient to the plastic sheeting easily occurred, overcome in prior art wood-plastic clad plate preparation process
Exist because wood material size is little, content is low, the utilization of resources that brings of plastics and Density Distribution inequality is unreasonable, energy expenditure
Greatly, the problem of Wood plastic boards comprehensive mechanical property difference.
Detailed description of the invention 2: combine Fig. 1 and Fig. 2 and present embodiment is described, a kind of oriented multilayer wood described in present embodiment
The preparation method of plastic clad plate, orienting spreading described in described step 6 includes step in detail below:
A, orienting spreading bottom: raw mixture is oriented acquisition of mating formation there is certain thickness orienting spreading bottom；
B, orienting spreading last layer: on described orienting spreading bottom, change orienting spreading direction, with described orienting spreading bottom
The perpendicular relation of angle continues superposition orienting spreading last layer；
C, completing slab orienting spreading: repeat b step several times, until completing to have mating formation of certain thickness and the number of plies, then entering
Mating formation in row top layer, is finally completed plate blank paving.Other are identical with detailed description of the invention 1.
Present embodiment have the technical effect that due to use the multi-layer oriented mode mated formation, from macroscopically making wood plastics composite
The mechanical index such as the MOR of sheet material, the modulus of elasticity in static bending, internal bond strength have obtained comprehensive improvement, and the water suction making sheet material is thick
Degree expansion rate decreases, and then makes the performance of wood-plastic composite panel more superior.
Detailed description of the invention 3: combine Fig. 1 and Fig. 2 and present embodiment is described, a kind of oriented multilayer wood described in present embodiment
The preparation method of plastic clad plate, the thickness of multi-layer oriented middle monolayer of mating formation described in adjustable during orienting spreading in described step 6,
And described multi-layer oriented mat formation in the number of plies mated formation be odd-level.Other are identical with detailed description of the invention 1 or 2.
Present embodiment have the technical effect that orienting spreading become odd-level be possible not only to improve the mechanical property of sheet material, letter
Metallization processes, improve apparent mass, it is also possible to reduce the probability of sheet material generation buckling deformation.
Detailed description of the invention 4: combine Fig. 1, Fig. 2 and Fig. 3 and present embodiment is described, described in present embodiment, a kind of orientation is many
The preparation method of layer wood-plastic clad plate, wood material described in step one is divided into wood-based wood material and stalk base wood raw material；
The multi-layer oriented bottom mated formation described in step 6 and top layer use for wood-based wood material, remainder layer use for straw base
Wood material or wood-based wood material.Other are identical any one of with detailed description of the invention 1～3.
Present embodiment have the technical effect that top layer use wood-based wood material be conducive to improve wood plastics composite further
The shock resistance of sheet material, and surface smoothness and the aesthetic property of wood-plastic composite panel can be effectively improved, improve Wood plastic boards
The comprehensive mechanical property of product and achieve bad material excellent with, add added value of product；When remainder layer uses straw base wooden former
Be conducive to during material improving the ratio of strength to weight of sheet material and improving the comprehensive mechanical property of sheet material.
Detailed description of the invention 5: combine Fig. 1, Fig. 2 and Fig. 3 and present embodiment is described, described in present embodiment, a kind of orientation is many
The preparation method of layer wood-plastic clad plate, in step 6, raw mixture is oriented to mat formation and refers to mutually overlap raw mixture
And superposition, mat formation with axially becoming 0～30 degree of angle with raw mixture length direction.Other are with detailed description of the invention 1～4
Any one of identical.
Present embodiment have the technical effect that mutually overlap joint superposition can increase raw mixture machine in hot pressing
Tool interlocks, and also can further rely on the chemical bond between wood material and wooden raw material and realize the lifting of sheet material mechanical property.
Detailed description of the invention 6: combine Fig. 1 and present embodiment is described, described in present embodiment, a kind of oriented multilayer wood is moulded multiple
The preparation method of plywood, thermoplastic plastic foil described in step 5 is collectively disposed at inclined shaft cylinder with the wood material of orienting spreading
In, mix, to mix homogeneously with per minute 10 speed going to 60 turns.Other are any one of with detailed description of the invention 1～5
Identical.
Present embodiment have the technical effect that employing inclined shaft cylinder can with the quality of Appropriate application wood materials itself and heavily
Power realizes mixing, and using per minute 10 speed going to 60 turns to avoid and decrease as far as possible, that mechanical mixture is likely to result in is wooden former
The probability that material is the most damaged, and then ensure that the physical and mechanical property of wood material does not decline in mixed process, with
Time can mix homogeneously by plastic tab and wood material.
Detailed description of the invention 7: combine Fig. 1, Fig. 2 and Fig. 3 and present embodiment is described, described in present embodiment, a kind of orientation is many
The preparation method of layer wood-plastic clad plate, described in step 6 multi-layer oriented mat formation in each layer orientation side of raw mixture when mating formation
Axial to being parallel or perpendicular to slab, overlaying structure is symmetrical at slab central plane simultaneously.Other are with detailed description of the invention 1～6
Any one of identical.
Having the technical effect that of present embodiment is improving the machining that can improve sheet material while sheet material physical property
Performance.
Detailed description of the invention 8: combine Fig. 1, Fig. 2 and Fig. 3 and present embodiment is described, described in present embodiment, a kind of orientation is many
The preparation method of layer wood-plastic clad plate, the thermoplastic described in step 6 is high density polyethylene (HDPE), Low Density Polyethylene, highly dense
Degree polypropylene, polrvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene resin, nylon, polylactic acid, poly-hydroxy fatty acid
One or more in ester.Other are identical any one of with detailed description of the invention 1～7.
Having the technical effect that of present embodiment uses thermoplastic to be processed being effectively ensured the processing of the present invention
Performance, chooses the combination of one or more in above-mentioned plastics and can improve the combination property of sheet material, and sheet material can be made to have spy
Different purposes.
Detailed description of the invention 9: combine Fig. 1 and present embodiment is described, described in present embodiment, a kind of oriented multilayer wood is moulded multiple
The preparation method of plywood, described thermoplastic is virgin material or the waste material of recovered acquisition or combination.Other with
Any one of detailed description of the invention 1～8 identical.
Having the technical effect that of present embodiment only uses virgin material to be conducive to making material property controlled；And use recovered
Waste or used plastics or use the compound of virgin material and recovered waste or used plastics that waste or used plastics can be made to be used appropriately, decreases resource
Waste, it is to avoid unnecessary environmental pollution, it is achieved that waste or used plastics and the comprehensive utilization of wooden resource.
Detailed description of the invention 10: combine Fig. 1, Fig. 2 and Fig. 3 and present embodiment is described, a kind of orientation described in present embodiment
The preparation method of multilayer wood-plastic composite plate, orients the breadth a length of 400～2440mm of slab described in step 6, and width is 400
～1220mm；Multiple-layer stacked is oriented slab when putting in flat-bed press described in step 7, limit flat-bed press pressing plate
Thickness be 6～55mm.Other are identical any one of with detailed description of the invention 1～9.
Large-scale industrial production is easy in having the technical effect that of present embodiment, is also beneficial to utilize existing furniture system
Make pushing away of industry, packaging industry, machining equipment that woodwork processing industry is general, beneficially oriented multilayer wood-plastic composite panel
Wide and universal.
Use following embodiment verify effect of the present invention:
Embodiment one:
The present embodiment is prepared for orienting sweet Sorghum vulgare Pers.-high-density polyethylene plastics composite plate, and processing step is:
Step one, getting the raw materials ready: remove the leaf of sweet Sorghum vulgare Pers. after results, the method rolled by cylinder is by ironed for sweet Sorghum vulgare Pers. and cut
Disconnected, while rolling, the syrup in sweet Sorghum vulgare Pers. is extruded.Remove tiny residue by mechanical grading after rolling, obtain a length of 20
～80mm, wide 5～15mm, the sweet Sorghum vulgare Pers. wood shavings of thick 1～2mm.
Step 2, pretreatment of raw material: sweet Sorghum vulgare Pers. wood shavings are put into heat treatment 2 hours in the drying baker at 140 DEG C, and it contains
Water rate is down to less than 3%.
Step 3, interpolation coupling agent: use the poly-methyl diphenylene diisocyanate of liquid (pMDI) as coupling agent, coupling
Agent addition is the 2% of sweet Sorghum vulgare Pers. wood shavings weight.By target product size (long: 2440mm, wide: 1220mm, thick: 15mm),
Density (800kg/m3) and material loss rate (10%) calculate the weight of slab, further according to sweet Sorghum vulgare Pers. wood shavings and coupling agent
Gross weight is the weight that the 90% of slab weight calculates sweet Sorghum vulgare Pers. wood shavings and pMDI respectively, rear by cylinder rotary spraying
Mode pMDI is applied on wood shavings, take out afterwards raw material is divided into 5 parts stand-by.
Step 4, cylinder mix: weigh high density polyethylene (HDPE) (HDPE) plastic tab, thin slice by the 10% of slab gross weight
Length with width identical with the length and width of slab, thickness is 0.1mm；HDPE plastic thin slice and wood material are collectively disposed at inclined shaft cylinder
In mix with per minute 10 speed going to 60 turns, it is thus achieved that raw mixture.
Step 5, orienting spreading bottom: on forming cauls, lay silicon dioxide processing release paper (thickness is 0.76mm), by former
Material mixture is oriented acquisition of mating formation and has certain thickness orienting spreading layer, the length direction of fiber and slab in wood shavings
Axially becoming the angle of 0～30 degree, the size of angle is determined by the spacing of orienting spreading equipment upper spacer.
Step 6, orienting spreading intermediate layer: change orienting spreading direction on previous orienting spreading layer, with previous orientation paving
Dress layer continues superposition at an angle and is oriented and mats formation.
Step 7, complete slab orienting spreading: carry out completing after mating formation in top layer plate blank paving, thus form sweet Sorghum vulgare Pers. plane
Flower and HDPE thin slice mix and are layered the structure of plate slab mated formation.Finally the upper surface at slab adds release paper, prevent slab and
Shaped article and hot press adhesion.
Step 8, hot pressing and cold pressing: the hot press upper and lower plates temperature stabilization that oil is first heated by examination, then will step at 160 DEG C
The slab translation that in rapid seven, assembly is complete is put in flat-bed press, uses the way of THICKNESS CONTROL that slab is carried out hot pressing；Will
Slab thickness is down to 20mm with press prestissimo, then with 40s, thickness is down to target thickness 15mm, keeps a little 15mm thickness afterwards
Close heater after hot pressing 10min, and upwards lower hot pressing board is passed through the cold water of 15 DEG C, when steel slab surface temperature is down to 40 DEG C
Slowly open press, take out product.
Step 9, post-production: be placed on cooling frame by the product in step 8, treat that product temperature is down to room temperature laggard
Row surrounding cutting edge.
Embodiment 2
The present embodiment is prepared for orienting poplar-high density polyethylene (HDPE)-igelite composite plate, and processing step is:
Step one, get the raw materials ready: poplar log band saw is sawn into the thick plank of 13mm, then be cut into 150mm length and send into orientation plane
Sheet machine is made the veneer of a size of 150 × 13 × 0.4mm.
Step 2, pretreatment of raw material: poplar veneer is put into heat treatment 2 hours in the drying baker at 140 DEG C, and it is aqueous
Rate is down to less than 3%.
Step 3, prepare plastic tab: thermoplastics processing is become thickness be 0.02～0.8mm, a length of 50～
120mm, width are the plastic tab of 10～25mm.
Step 4, interpolation coupling agent: use the poly-methyl diphenylene diisocyanate of liquid (pMDI) as coupling agent, coupling
Agent addition is the 2% of wood weight.By target product size (long: 800mm, wide: 700mm, thick: 15mm), density
(800kg/m3) and material loss rate (10%) calculate the weight of slab, be slab further according to timber and coupling agent gross weight
The 90% of weight calculates the weight of poplar veneer and pMDI respectively, is applied on wood chip by pMDI with spraying method.
Step 5, cylinder mix: weigh HDPE plastic thin slice by the 8% of slab gross weight, weigh by the 2% of slab gross weight
Polrvinyl chloride (PVC) thin slice, is collectively disposed at described thermoplastic materials thin slice in cylinder with wood material and mixs homogeneously, it is thus achieved that raw material mixes
Compound.
Step 6, multi-layer oriented mat formation: on forming cauls, lay silicon dioxide processing release paper (thickness is 0.76mm), by former
Material mixture orienting spreading on silicon dioxide processing release paper, the angle axially becoming 0～30 degree of the direction of wood chip and slab, angle
Size determined by the spacing of orienting spreading equipment upper spacer.Afterwards, change orienting spreading direction, with previous pave-load layer angle in
Vertical relation continues superposition orienting spreading last layer.Repeat the above steps, until completing to have mating formation of certain thickness and the number of plies,
Carry out top layer again to mat formation, be finally completed plate blank paving.Finally the upper surface at slab adds release paper, prevents slab and molding from producing
Product and hot press adhesion.
Step 7, hot pressing and cold pressing: the hot press upper and lower plates temperature stabilization that oil is first heated by examination, then will step at 160 DEG C
The slab translation that in rapid six, assembly is complete is put in flat-bed press, uses the way of THICKNESS CONTROL that slab is carried out hot pressing.First
With press prestissimo, slab thickness being down to 20mm, then with 40s, thickness is down to target thickness 15mm, a little 15mm of rear holding are thick
Close heater after degree hot pressing 10min, and upwards lower hot pressing board is passed through the cold water of 15 DEG C, treats that steel slab surface temperature is down to 40 DEG C
Time slowly open press, take out product.
Step 8, post-production: be placed on cooling frame by the product in step 7, treat that product temperature is down to room temperature laggard
Row surrounding cutting edge.
Claims (10)
1. a preparation method for oriented multilayer wood-plastic clad plate, comprises the following steps:
Step one, get the raw materials ready: by timber and straw by flaking, chip, roll, one or more modes in sawing and screening add
Work growth 20～200mm, wide 2～20mm, the wood material of thick 0.1～2mm；
Step 2, pretreatment of raw material: wood material is carried out high temperature drying or hot-water extraction processes or combination, and by wood
The moisture content of raw material is dried to less than 5%, reduces the surface energy of wood material simultaneously；
Step 3, prepare plastic tab: thermoplastics processing is become thickness be 0.02～0.8mm, a length of 50～120mm,
Width is the plastic tab of 10～25mm；
Step 4, interpolation coupling agent: use spraying method will to account for oriented multilayer wood-plastic clad plate quality 0.5～the liquid coupling of 4%
Agent is applied on pretreated wood material；
Step 5, cylinder mix: will account for oriented multilayer wood-plastic clad plate quality 5～the described thermoplastic plastic foil of 30% and institute
State wood material and be collectively disposed at mix homogeneously in cylinder, it is thus achieved that raw mixture；
Step 6, multi-layer oriented mat formation: carry out raw mixture being layered orienting spreading, it is thus achieved that multiple-layer stacked orientation slab；
Step 7, hot pressing and cold pressing: multiple-layer stacked is oriented slab put in flat-bed press at 120～220 DEG C hot pressing 3～
20 minutes, it is passed through 5～25 DEG C of cold water to hot press heating plate afterwards or proceeds to slab cold pressing to room temperature press, treating plate
Base temperature is down to when 50～60 DEG C take out；
Step 8, post-production: display after carrying out cutting edge and surface process.
The preparation method of a kind of oriented multilayer wood-plastic clad plate, it is characterised in that described in step 6
Orienting spreading includes step in detail below:
A, orienting spreading bottom: raw mixture is oriented acquisition of mating formation there is certain thickness orienting spreading bottom；
B, orienting spreading last layer: on described orienting spreading bottom, change orienting spreading direction, with described orienting spreading bottom
The perpendicular relation of angle continues superposition orienting spreading last layer；
C, completing slab orienting spreading: repeat b step several times, until completing to have mating formation of certain thickness and the number of plies, then entering
Mating formation in row top layer, is finally completed plate blank paving.
The preparation method of a kind of oriented multilayer wood-plastic clad plate, it is characterised in that described in step 6
Adjust during orienting spreading described multi-layer oriented mat formation in the thickness of each layer.
4. according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of claim 3, it is characterised in that step
Multi-layer oriented described in rapid six mating formation, the number of plies mated formation is odd-level.
5. according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of Claims 1-4, it is characterised in that
In step 6, raw mixture is oriented to mat formation and refers to mutually be overlapped and superposition by raw mixture, with raw mixture length
Mat formation with axially becoming 0～30 degree of angle in direction.
6. according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of Claims 1-4, it is characterised in that
Thermoplastic plastic foil described in step 5 is collectively disposed in inclined shaft cylinder with the wood material of orienting spreading, with 10 turns per minute
Mix to the speed of 60 turns, to mix homogeneously.
7. according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of Claims 1-4, it is characterised in that
Described in step 6 multi-layer oriented mat formation in each layer when mating formation the orientation direction of raw mixture to be parallel or perpendicular to slab axial,
Overlaying structure is symmetrical at slab central plane simultaneously.
8. according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of Claims 1-4, it is characterised in that
Thermoplastic described in step 3 is high density polyethylene (HDPE), Low Density Polyethylene, high density poly propylene, polrvinyl chloride, polyphenyl
One or more in ethylene, acrylonitrile-butadiene-styrene resin, Buddhist nun's moon bright, polylactic acid, polyhydroxyalkanoate.
The preparation method of a kind of oriented multilayer wood-plastic clad plate, it is characterised in that described thermoplastic
Property plastics are the waste material of recovered acquisition.
10., according to the preparation method of oriented multilayer wood-plastic clad plate a kind of according to any one of Claims 1-4, its feature exists
In the breadth orienting slab described in step 6 a length of 400～2440mm, width is 400～1220mm；General described in step 7
When multiple-layer stacked orientation slab is put in flat-bed press, limit the thickness of flat-bed press pressing plate as 6～55mm.
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