CN104441102A - Manufacturing method for composite density board - Google Patents

Manufacturing method for composite density board Download PDF

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Publication number
CN104441102A
CN104441102A CN201410557454.9A CN201410557454A CN104441102A CN 104441102 A CN104441102 A CN 104441102A CN 201410557454 A CN201410557454 A CN 201410557454A CN 104441102 A CN104441102 A CN 104441102A
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CN
China
Prior art keywords
slab
substrate layer
density board
composite density
conductive carbon
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410557454.9A
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Chinese (zh)
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CN104441102B (en
Inventor
姚越凡
胡成孟
钟韦红
林成官
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liuzhou Purple Rabbit Wood Industry Co ltd
Original Assignee
GUIZHOU HENGLIYUAN FORESTRY TECHNOLOGY Co Ltd
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Application filed by GUIZHOU HENGLIYUAN FORESTRY TECHNOLOGY Co Ltd filed Critical GUIZHOU HENGLIYUAN FORESTRY TECHNOLOGY Co Ltd
Priority to CN201710997411.6A priority Critical patent/CN107791343A/en
Priority to CN201710997404.6A priority patent/CN107627409A/en
Priority to CN201410557454.9A priority patent/CN104441102B/en
Publication of CN104441102A publication Critical patent/CN104441102A/en
Application granted granted Critical
Publication of CN104441102B publication Critical patent/CN104441102B/en
Expired - Fee Related legal-status Critical Current
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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
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
    • 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
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/142—Laminating of sheets, panels or inserts, e.g. stiffeners, by wrapping in at least one outer layer, or inserting into a preformed pocket
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/18—Handling of layers or the laminate
    • B32B38/1808—Handling of layers or the laminate characterised by the laying up of the layers
    • B32B38/1816—Cross feeding of one or more of the layers
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B32B2262/062—Cellulose fibres, e.g. cotton
    • B32B2262/067—Wood fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/14—Mixture of at least two fibres made of different materials
    • 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
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding

Abstract

The invention provides a manufacturing method for a composite density board. The manufacturing method includes the following steps that step A, wood or plant raw material is manufactured into dry fibers, 4%-6% of chopped fibers are added into the dry fibers according to the weight ratio, and then stirring and mixing are performed; step B, mixed material obtained in the step A is used for laying a first slab layer, then electric conduction carbon fiber net-shaped fabric is laid on the first slab layer, and finally a second slab layer is laid on the electric conduction carbon fiber net-shaped fabric; step C, an integrated slab obtained in the step B is hot pressed, and then the composite density board is obtained through manufacturing. The manufacturing method for the composite density board can greatly improve the comprehensive performance of a beaver board and lower the production cost.

Description

A kind of manufacture method of composite density board
Technical field
The present invention relates to a kind of manufacture method of wood-based plate, particularly a kind of manufacture method of composite density board.
Background technology
Fiberboard has another name called density board, is with wood fibre or other plant cellulose fiber for raw material, applies the wood-based plate that Lauxite or other adhesive be suitable for are made.Development Fibreboard Production is the effective way of timber resources comprehensive utilization.The shortcoming of fiberboard because producing expansive force difference, bow warping is out of shape after moisture absorption; Hard plate material surface is hard, nail nail difficulty, poor water resistance.Along with domestic construction decoration marked and furniture manufacturing industry are to the growth of beaver board demand, in order to improve the combination property of beaver board, also there is a lot of method, such as, Chinese patent CN2320409Y just provides and a kind ofly arranges glass fabric to improve the technical scheme of MOR and elastic modelling quantity at fiberboard upper and lower surface, but, as Chinese patent CN2320409Y, the existing technical scheme improving beaver board is all after beaver board creates often, final products are obtained as raw material secondary operations using beaver board, therefore there is production cost high, the problems such as complex procedures.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of manufacture method of composite density board, to reduce or to avoid problem noted earlier.
Specifically, the invention provides a kind of manufacture method of composite density board, described composite density board comprises the first substrate layer, second substrate layer of integrated hot pressing formed, enhancement Layer is provided with between described first substrate layer and described second substrate layer, described first substrate layer and described second substrate layer material are the chopped carbon fiber mixing 4%-6% weight ratio in wood fibre or string, described enhancement Layer comprises conductive carbon fibre reticulated, and it comprises the steps
Steps A, after wooden or plant material are made dried fibres, adds the chopped carbon fiber of 4%-6% according to weight ratio wherein and is uniformly mixed;
Step B, the mixed material in steps A is used to lay ground floor slab, then on described first time slab, conductive carbon fibre reticulated is laid, on described conductive carbon fibre reticulated, lay second layer slab again, described ground floor slab and described second layer slab tundish clip described conductive carbon fibre reticulated and form overall slab;
Step C, the described overall slab completed by step B carries out hot pressing, completes the manufacture of described composite density board.
The present invention proposes a kind of manufacture method of composite density board, it is compounded in beaver board by nested for the enhancement Layer be made up of conductive carbon fibre reticulated, also just can in staple fibre board manufacturing process, conductive carbon fibre reticulated is laid in advance between two-layer slab, and then by hot pressing, two-layer slab and conductive carbon fibre reticulated are complex as a whole, thus only need use production line can produce described composite density board, greatly can improve the combination property of beaver board and can production cost be reduced.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 display be the structural representation of composite density board manufactured by the method for a specific embodiment of the present invention;
The manufacturing theory schematic diagram that Fig. 2 is the composite density board shown in Fig. 1.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.Wherein, identical parts adopt identical label.
Fig. 1 display be the structural representation of composite density board manufactured by the method for a specific embodiment of the present invention, shown in Figure 1, the invention provides a kind of manufacture method of composite density board, described composite density board comprises the first substrate layer 1 of integrated hot pressing formed, second substrate layer 2, enhancement Layer 3 is provided with between described first substrate layer 1 and described second substrate layer 2, described first substrate layer 1 and described second substrate layer 2 material are the chopped carbon fiber mixing 4%-6% weight ratio in wood fibre or string, described enhancement Layer 3 comprises conductive carbon fibre reticulated, described method comprises the steps,
Steps A, after wooden or plant material are made dried fibres, adds the chopped carbon fiber of 4%-6% according to weight ratio wherein and is uniformly mixed;
In the present invention, first utilize existing technique by wooden or plant material by chipping-screening machine-washing-defibrator-glue compounding and applying-drying after make dried fibres, then add according to the weight of described dried fibres the chopped carbon fiber that weight is described dried fibres weight 4%-6%, and utilize mixing plant to stir, make it mix.
Step B, uses the mixed material in steps A to lay ground floor slab, then on described first time slab, lays conductive carbon fibre reticulated, then lay second layer slab on described conductive carbon fibre reticulated; Described ground floor slab and described second layer slab tundish clip described conductive carbon fibre reticulated and form overall slab;
Described enhancement Layer 3 due to described composite density board is arranged between described first substrate layer 1 and described second substrate layer 2, therefore, the present invention and the maximum difference of prior art are also just, prior art is all first slab is made fiberboard, and then at fibreboard surface by reinforcement material in the mode compounds such as hot pressing.And composite density board provided by the invention, the described enhancement Layer 3 of its inside is in board making process, with described first substrate layer 1 and described second substrate layer 2 integrated hot pressing formed.That is to say, when slab is laid, in steps A, the fibre blank of output is laid at twice.
First, lay the blank for the formation of described second substrate layer 2, i.e. ground floor slab, then stop toppling over blank, lay described conductive carbon fibre reticulated at the blank for the formation of described second substrate layer 2, then continue on described conductive carbon fibre reticulated, to lay the blank for the formation of described first substrate layer 1, i.e. second layer slab, so far, the laying of overall slab is completed.
The thickness of described ground floor slab and described second layer slab can be laid according to the thickness of final described first substrate layer 1 and described second substrate layer 2.Described first substrate layer 1 is greater than 3mm with the thickness of described second substrate layer 2, can ensure like this in hot pressing recombination process, slab for the formation of described first substrate layer 1 and described second substrate layer 2 can be good at being complex as a whole with the conductive carbon fibre reticulated forming described enhancement Layer 3, and bonding firmly.
In order to ensure that described conductive carbon fibre reticulated can utilize the composite joint of the adhesive glue in the fibre blank of steps A output and described first substrate layer 1 and described second substrate layer 2 enough tight, described conductive carbon fibre reticulated can be the ready-made hollow reticulated woven by conductive carbon fibre silk, and use geotextiles bound edge in its surrounding, such as, the manufacturing theory schematic diagram that Fig. 2 is the composite density board shown in Fig. 1, in figure, dotted line represents the size of overall slab, solid line represents described conductive carbon fibre reticulated, shown in Figure 2, the longitudinal size of described overall slab is L1, lateral dimension is W1, the longitudinal size of described conductive carbon fibre reticulated is L2, lateral dimension is W2, the size of mesh opening size of described conductive carbon fibre reticulated can be 5x5-10x10mm, the width W 3 of described geotextiles bound edge can be 8-15mm, the size of described conductive carbon fibre reticulated is greater than the size of described overall slab in the longitudinal direction of described overall slab direction of transfer, that is to say that L2 is greater than L1, be less than the size of described overall slab in the horizontal, that is to say that W2 is less than W1, so just can ensure that described overall slab is in transport process, both sides can not have described conductive carbon fibre reticulated to spill, also would not blank be caused to be scattered before carrying out hot pressing.The width W 3 of described geotextiles bound edge can be 8-15mm, utilize described geotextiles bound edge, the carbon fiber wire being woven into described conductive carbon fibre reticulated can be made in process of deployment to keep size, can not be misplaced distortion, and, when laying described conductive carbon fibre reticulated, can, so that geotextiles bound edge described in holder, avoid causing damage to the grid of described conductive carbon fibre reticulated.The geotextiles bound edge of described conductive carbon fibre reticulated both sides also can be compound in described composite density board, but due to its width less, therefore can't bring impact to the performance of described composite density board.Described conductive carbon fibre reticulated stretches out the part of described overall slab in the vertical, only needs to excise after described composite density board is made.
Step C, the described overall slab completed by step B carries out hot pressing, completes the manufacture of described composite density board.
Described enhancement Layer 3 is made up of conductive carbon fibre reticulated, while improving described composite density board combination property, after described composite density board manufacture completes, can also be energized to described enhancement Layer 3, heat from described composite denseness intralamellar part, thus accelerate the Form aldehyde release of described composite density board, in addition, described enhancement Layer 3 is owing to having conducting function, can also apply and special environment, such as, use composite density board provided by the invention, can be made into the container that the furniture etc. that can carry out electromagnetic shielding has certain spatial accommodation.
Described first substrate layer 1 and the described chopped carbon fiber in described second substrate layer 2 can promote the combination property of described beaver board further, such as, when described composite density board is in hot environment, described first substrate layer 1 can effectively avoid described composite density board to deform with the chopped carbon fiber of described second substrate layer 2.
The present invention proposes a kind of manufacture method of composite density board, it is compounded in beaver board by nested for the enhancement Layer be made up of conductive carbon fibre reticulated, also just can in staple fibre board manufacturing process, conductive carbon fibre reticulated is laid in advance between two-layer slab, and then by hot pressing, two-layer slab and conductive carbon fibre reticulated are complex as a whole, thus only need use production line can produce described composite density board, greatly can improve the combination property of beaver board and can production cost be reduced.
Although it will be appreciated by those skilled in the art that the present invention is described according to the mode of multiple embodiment, not each embodiment only comprises an independently technical scheme.So describe in description be only used to clear for the purpose of; description should integrally be understood by those skilled in the art, and regards technical scheme involved in each embodiment as the mode that mutually can be combined into different embodiment to understand protection scope of the present invention.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.

Claims (1)

1. the manufacture method of a composite density board, it is characterized in that, described composite density board comprises the first substrate layer, second substrate layer of integrated hot pressing formed, enhancement Layer is provided with between described first substrate layer and described second substrate layer, described first substrate layer and described second substrate layer material are the chopped carbon fiber mixing 4%-6% weight ratio in wood fibre or string, described enhancement Layer comprises conductive carbon fibre reticulated, and it comprises the steps
Steps A, after wooden or plant material are made dried fibres, adds the chopped carbon fiber of 4%-6% according to weight ratio wherein and is uniformly mixed;
Step B, the mixed material in steps A is used to lay ground floor slab, then on described first time slab, conductive carbon fibre reticulated is laid, on described conductive carbon fibre reticulated, lay second layer slab again, described ground floor slab and described second layer slab tundish clip described conductive carbon fibre reticulated and form overall slab;
Step C, the described overall slab completed by step B carries out hot pressing, completes the manufacture of described composite density board.
CN201410557454.9A 2014-10-20 2014-10-20 A kind of manufacture method of composite density board Expired - Fee Related CN104441102B (en)

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CN201710997411.6A CN107791343A (en) 2014-10-20 2014-10-20 A kind of composite density board
CN201710997404.6A CN107627409A (en) 2014-10-20 2014-10-20 A kind of manufacture method of composite density board
CN201410557454.9A CN104441102B (en) 2014-10-20 2014-10-20 A kind of manufacture method of composite density board

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