CN112643838A - Co-extruded artificial board and manufacturing method thereof - Google Patents
Co-extruded artificial board and manufacturing method thereof Download PDFInfo
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- CN112643838A CN112643838A CN202011535366.0A CN202011535366A CN112643838A CN 112643838 A CN112643838 A CN 112643838A CN 202011535366 A CN202011535366 A CN 202011535366A CN 112643838 A CN112643838 A CN 112643838A
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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
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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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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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
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- Forests & Forestry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The application discloses crowded wood-based plate altogether and manufacturing method thereof, including the intensity layer, at least the processing layer that the surface covering on intensity layer set up, the intensity layer is wooden material layer, the processing layer is crowded material layer altogether, just the intensity layer with combine through crowded technology altogether between the processing layer. The co-extrusion artificial board can improve the production efficiency and simplify the production process to a certain extent.
Description
Technical Field
The application relates to the technical field of wood board products, in particular to a co-extrusion artificial board and a manufacturing method of the co-extrusion artificial board.
Background
Artificial boards are commonly used in the fields of building structure construction, indoor and outdoor decoration, furniture manufacture and the like. The co-extruded material layer has the advantages of hard strength, good weather resistance, good dimensional stability and the like, and the surface processability of the material is strong, so that the material can adapt to modeling processing such as routing, carving, cutting and the like, but the mechanical property of the material is relatively weak; the wood material has relatively good mechanical property and dimensional stability, but the surface processability is relatively poor, and when the wood material is subjected to modeling processing such as routing, carving and the like, the glue layer is easily exposed at a cut line, so that the attractiveness is affected.
Therefore, the prior art provides an artificial board formed by coating a co-extrusion material layer on the surface of a wood material layer. For example, the invention of chinese patent CN 201410057895.2 provides "a wood-plastic composite material veneered plywood and a method for manufacturing the same", which is to compound the manufactured wood-plastic composite sheet (one of the co-extruded material layers) with the non-woven fabric and the wood plywood by hot-pressing adhesive (in the prior art, a cold-pressing compounding process is also adopted), so as to manufacture the wood-plastic composite material veneered plywood. The artificial board after being compounded has the structural strength of the wood veneer and the surface of the wood veneer has the modeling treatment performance, thereby solving the contradiction.
However, the use of the above product structure and production process has the technical problems of relatively low production efficiency and relatively complicated production process.
Disclosure of Invention
It is a technical object of the present application to overcome the above technical problems, and to provide a co-extruded artificial board, which is compounded by co-extruding and connecting a processing layer and a wood material layer, thereby improving production efficiency to a certain extent and simplifying production process; the application also provides a manufacturing method for preparing the co-extrusion artificial board.
For realizing the first technical purpose of this application, this application provides a crowded wood-based plate altogether, include the intensity layer, be in at least the processing layer that the surface covering on intensity layer set up, the intensity layer is wooden material layer, the processing layer is crowded material layer altogether, just the intensity layer with combine through crowded technology altogether between the processing layer.
By the product, the strength layer is a wood material layer and is mainly used for providing mechanical strength, such as tensile strength and bending strength, of the co-extruded artificial board; the processing layer is a co-extrusion material layer and covers the strength layer, and is mainly used for providing the surface processing capacity of the co-extrusion artificial board, so that the surface processing capacity of the co-extrusion artificial board is relatively high, the surface processing capacity and the surface hardness of the co-extrusion artificial board can be better adapted to surface modeling processing such as routing and carving, and the dimensional stability of the co-extrusion artificial board is provided, and the dimensional stability of the co-extrusion artificial board is lower in water absorption and better in anti-mildew performance.
The processing layer is connected with the strength layer in a co-extrusion mode while being extruded, so that compared with the connection process in the prior art, the production efficiency can be effectively improved, and the production process is simplified.
Meanwhile, the processing layer and the strength layer are combined through a co-extrusion process, so that the quality problem caused by the combination of the pressure process can be effectively avoided. Specifically, when the combination of the treatment layer and the strength layer is realized by adopting a hot pressing process (such as the process adopted in patent CN 201410057895.2), the co-extruded material of the treatment layer is heated for the second time, so that the mechanical properties of the co-extruded material are affected, and the co-extruded material is more easily aged; when the cold pressing process is adopted to realize the combination of the treatment layer and the strength layer, although the secondary heating of the treatment layer can be avoided, the relatively good gluing performance is difficult to obtain, and the problem of degumming is easy to occur. In the application, the processing layer and the strength layer are combined through a co-extrusion process, so that the processing layer and the strength layer are relatively firmly connected, secondary heating of the processing layer can be avoided, the mechanical property of the processing layer is prevented from being damaged, and the service life of the co-extruded artificial board is prolonged.
As a preferred embodiment, the co-extruded artificial board further comprises a bonding layer for connecting the strength layer and the treatment layer, and the strength layer and the bonding layer, and the bonding layer and the treatment layer are combined through a co-extrusion process.
In this technical scheme, adopt the tie coat with joint strength layer and processing layer, can improve the joint strength between the two comparatively effectively. Meanwhile, the bonding layer is combined with the strength layer and the processing layer through a co-extrusion process, so that the quality of the processing layer and the strength layer is not affected by the formation of the bonding layer in the manufacturing process, for example, the processing layer is heated secondarily through hot pressing used for forming the bonding layer.
In a preferred embodiment, the treatment layer is provided so as to cover the surface, the bottom surface, and both side surfaces of the strength layer.
In order to avoid the problems that the co-extruded artificial board is deformed and even the joint is peeled off due to different size variation of the strength layer and the processing layer of the co-extruded artificial board in the using process, the water content of the strength layer is adjusted to be within a target range in advance, so that the size variation of the strength layer and the processing layer in the using process is basically consistent. In the prior art, the strength layer and the processing layer are connected through hot pressing, the water content of the strength layer changes in the hot pressing process, and the change is difficult to quantify and depends on experience, so that the deformation and glue line peeling of the co-extrusion material-wood material composite artificial board prepared by the hot pressing process are still technical difficulties.
In the technical scheme, the processing layer surrounds the cladding strength layer, namely the processing layer covers the surface, the bottom surface and the two side surfaces of the strength layer, so that in the co-extrusion process, the cladding of the strength layer is heated (the co-extrusion process is a high-temperature processing process), and the water in the strength layer is not lost due to heating. Such advantage is, the process of crowded altogether can not make the moisture content of intensity layer change to the moisture content of control intensity layer that can be accurate relatively, the moisture content of intensity layer remains throughout in predetermined within range, and the stability of product is easily controlled in addition, thereby the technology degree of difficulty simplified on this one hand.
In a preferred embodiment, the treatment layer is disposed to cover the surface and the bottom surface of the strength layer.
As a preferred embodiment, the strength layer is a plywood layer, and the treatment layer is a wood-plastic material layer.
In a preferred embodiment, the thickness of the strength layer is 8.0 to 40.0mm, and the thickness of the treatment layer is 1.0 to 8.0 mm.
In order to achieve the second technical object of the present application, the present application further provides a method for manufacturing a co-extruded artificial board, in which the strength layer is continuously fed into the center of a co-extrusion mold, and a co-extruded material for forming the treatment layer is continuously fed into the mold, so that the co-extruded material at least flows to the surface of the strength layer in the mold, and the co-extruded material and the surface of the strength layer are extruded together to form the treatment layer connected with the strength layer.
By means of the method, the processing layer (co-extrusion material) is co-extruded and simultaneously the co-extrusion compounding with the strength layer is realized, so that compared with the pressing and pasting type connecting process in the prior art, the production efficiency can be effectively improved, and the production process is simplified.
On the other hand, the co-extrusion of the treatment layer (co-extrusion material) and the compounding of the treatment layer and the strength layer are completed simultaneously, so that the secondary heating of the treatment layer can be avoided, and the original mechanical property and aging resistance of the co-extrusion material layer of the treatment layer of the prepared co-extrusion artificial board can be maintained.
In a preferred embodiment, an adhesive is continuously fed into the mold, and the adhesive flows between the strength layer and the co-extruded material and is co-extruded with the strength layer and the co-extruded material to form a bonding layer for connecting the strength layer and the treatment layer.
In this technical scheme, use gluing agent can further strengthen handling layer and the linking (combination) intensity of intensity layer, and gluing agent and handling layer, the interlinkage between the intensity layer also realizes through crowded altogether, consequently, compare with prior art, even used gluing agent, can avoid handling the secondary of layer to be heated.
In a preferred embodiment, the co-extruded material is wrapped around the strength layer in the mold and is extruded together to form the treatment layer wrapped around the surface, bottom, and two sides of the strength layer.
As known by persons skilled in the art, the size variation of the strength layer and the processing layer of the co-extruded artificial board is different along with the change of the temperature and the humidity of the environment, so that the co-extruded artificial board is deformed, and the joint of a serious person is peeled. To avoid this, the manufacturer adjusts the moisture content of the strength layer to a target range in advance so that the dimensional change of the strength layer and the processing layer during use is substantially the same. However, in the hot-pressing connection process of the strength layer and the processing layer, the moisture content of the strength layer changes, and the change is difficult to quantify and is mostly based on experience, so that the deformation and glue line peeling of the co-extrusion material-wood material composite artificial board prepared by the hot-pressing process are still technical difficulties.
In the technical scheme, the processing layer surrounds the cladding strength layer, the strength layer is heated under the cladding of the co-extrusion material in the co-extrusion process, moisture in the strength layer migrates to the core layer but cannot leave the strength layer, and after cooling, the moisture content of the strength layer is restored to balance again. The method has the advantages that firstly, the water content of the strength layer is not changed in the co-extrusion process, so that the water content of the strength layer can be controlled relatively accurately, the water content of the strength layer is always kept in a preset range, and the stability of the product is easy to control, so that the process difficulty is simplified; secondly, the prepared co-extruded artificial board does not need long-time balance, health preservation and natural cooling.
As a preferred embodiment, before the co-extrusion, the method further comprises a pretreatment of at least the surface and the bottom surface of the strength layer, wherein the pretreatment comprises the following process steps:
s1, carrying out heat treatment on the surface and the bottom surface of the strength layer to enable the temperature of 0.5-1.5 mm thickness on the surface and the bottom surface of the strength layer to reach a heat treatment temperature, wherein the heat treatment temperature is lower than the co-extrusion temperature by 20-50 ℃;
s2, carrying out wet treatment on the surface and the bottom surface of the strength layer;
and S3, carrying out connection surface roughening treatment on the surface and the bottom surface of the strength layer.
In the technical scheme, the connection strength between the processing layer and the strength layer can be effectively improved by pretreating the connection surface (the surface and the bottom surface) of the strength layer, and the connection strength meeting the use requirement can be obtained even in the process without an adhesive. The principle may be that after the bonding surface of the strength layer has a certain thickness and a certain temperature, the effect of wet treatment is facilitated, the bonding surface of the strength layer is wetted on a certain thickness, and after the bonding surface is roughened, pores are formed on the bonding surface of the strength layer. When the strength layer and the co-extrusion material (raw material of the processing layer) are co-extruded simultaneously, the surface layer of the strength layer with a certain temperature is further heated, the core layer is not heated, and a temperature difference of high surface layer and low core layer is formed in the thickness direction of the strength layer. At the moment, the processing layer covers the surface of the strength layer and is not completely formed, the surface layer with a certain temperature of the strength layer is cooled along with the joint extrusion and leaves the die, and the moisture moving from the surface layer to the core layer is not reset, so that negative pressure is formed in the pores formed by rough processing, the co-extruded material which is not completely formed enters the pores, the auxiliary processing layer is combined with the strength layer, and the connection strength is improved.
In summary, the co-extrusion artificial board and the manufacturing method thereof provided by the application are compounded by co-extrusion connection of the processing layer and the wood material layer, so that the production efficiency is improved to a certain extent, and the production process is simplified.
Drawings
FIG. 1 is a schematic structural diagram of a co-extruded artificial board according to embodiment 1 of the present application;
FIG. 2 is a schematic view of a production process of a co-extruded artificial board according to example 2 of the present application;
FIG. 3 is a schematic structural diagram of a co-extruded artificial board according to embodiment 3 of the present application;
FIG. 4 is a schematic view of a production process of a co-extruded artificial board according to embodiment 3 of the present application;
FIG. 5 is a schematic structural diagram of a co-extruded artificial board according to embodiment 4 of the present application;
FIG. 6 is a schematic view of a production process of a co-extruded artificial board according to embodiment 4 of the present application;
in the above drawings:
110-strength layer, 120-treatment layer, 130-bonding layer, 210-mixing tank, 220-glue storage tank, 300-dispenser, 400-mould, 500-heat, roller, 600-sponge roller and 700-polishing head.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments thereof, with reference to the accompanying drawings.
Example 1: referring to fig. 1, the specification of the co-extruded artificial board is 1024 × 2048 × 10mm, and a single-sided co-extrusion process is adopted, that is, the co-extruded artificial board includes a strength layer 110 and a treatment layer 120 covering the surface of the strength layer 110, and the strength layer 110 and the treatment layer 120 are combined through the co-extrusion process. The strength layer 110 is a wood material layer, in this embodiment, the strength layer 110 is a plywood layer, and the thickness is 8.0 mm; the processing layer 120 is a co-extrusion material layer, in this embodiment, the processing layer 120 is a wood-plastic material layer, and the thickness is 2.0 mm.
In other embodiments, a double-sided co-extrusion process may be used, in which the treatment layer 120 is attached to the surface and bottom of the strength layer 110 by co-extrusion. In this case, the thickness of the strength layer 110 was 8.0mm, the thickness of the treated layer 120 coated on the surface was 1.0mm, and the thickness of the treated layer 120 coated on the bottom surface was 1.0 mm.
Example 2: example 2 is different from example 1 in that the treated layer 120 is connected to the surface and the bottom surface of the strength layer 110 by co-extrusion, the thickness of the strength layer 110 is 12.0mm, the thickness of the treated layer 120 coated on the surface is 3.5mm, and the thickness of the treated layer 120 coated on the bottom surface is 2.5 mm; or the strength layer 110 may have a thickness of 14.0mm, the surface treatment layer 120 may have a thickness of 5.5mm, and the bottom treatment layer 120 may have a thickness of 2.5 mm.
The production flow of the strength layer 110 with the treatment layer 120 on both the front and back sides is shown in fig. 2. The strength layers 110(11 layers of plywood) having a specification of 1024 x 2048 x 12mm are continuously fed into the mold 400 by a main conveyor line. In this embodiment, the co-extruded material is wood fiber powder (e.g., wood powder), thermoplastic plastic (e.g., polyethylene) or other ingredients used for manufacturing co-extruded wood-plastic material in the prior art, the wood fiber powder and the thermoplastic plastic (including ingredients) in the co-extruded material are respectively fed into the mixing tank 210, and are pre-mixed in the mixing tank 210 to form a pre-mixture, and the pre-mixture is continuously conveyed to the mold 400 by the twin-screw conveyor, and is located on the surface and the bottom surface of the strength layer 110; finally, in a mold 400, the premix and the strength layer 110 are extruded together, the temperature in the mold 400 is 150-160 ℃, and a co-extrusion artificial board is formed, wherein the co-extrusion artificial board sequentially comprises a surface treatment layer 120 with the thickness of 3.5mm, the strength layer 110 with the thickness of 12mm and a bottom treatment layer 120 with the thickness of 2.5mm from top to bottom.
Example 3: the difference between embodiment 3 and embodiment 1 is that, referring to fig. 3, the processing layer 120 covers the surface and the bottom surface of the strength layer 110, the bonding layer 130 is disposed between the strength layer 110 and the processing layer 120, the bonding layer 130 is an adhesive layer, and the strength layer 110 and the bonding layer 130, and the bonding layer 130 and the processing layer 120 are combined through a co-extrusion process. In this example, the strength layer 110 was 12.0mm thick, the treated layer 120 coated on the surface was 3.5mm thick, and the treated layer 120 coated on the bottom was 2.5mm thick.
Fig. 4 shows the production flow of the co-extruded artificial board of example 3. The difference from the production flow of embodiment 1 is that the production line is further provided with a glue storage tank 220, and the glue storage tank 220 stores thermosetting adhesives (such as phenolic resin adhesives) and continuously conveys the thermosetting adhesives to the distributor 300 through a screw conveyor; the premix in the mixing tank 210, strength layer 110, is also delivered to the dispenser 300. In the dispenser 300, the raw materials are distributed in the order of the pre-mixture, the adhesive, the strength layer, the adhesive, and the pre-mixture, and then conveyed to the mold 400 to be extruded together, and finally, in the mold 400, a co-extruded artificial board is formed, which sequentially includes the surface treatment layer 120, the adhesive layer 130, the strength layer 110, the adhesive layer 130, and the bottom treatment layer 120 from top to bottom.
Of course, in this manufacturing method, instead of using the dispenser 300, the premix, the adhesive, and the strength layer 110 may be directly fed into the mold 400.
Example 4: embodiment 4 is different from embodiment 1 in that, referring to fig. 5, the treated layer 120 is disposed around the longitudinal direction of the strength layer 110 so as to cover the strength layer 110, that is, the surface, the bottom, and both side surfaces of the strength layer 110. In this embodiment, the thickness of the strength layer 110 is still 12.0mm, the thickness of the treated layer 120 covering the surface is 3.0mm, and the thickness of the treated layer 120 covering the bottom surface is 3.0 mm.
FIG. 6 shows the production process of the co-extruded wood-based panel of example 4. The co-extruded material surrounds the strength layer 110 in the mold 400, and when the two are co-extruded, the treatment layer 120 covering the surface, the bottom, and the two sides of the strength layer 110 is formed.
In a preferred embodiment, before the die 400 completes the co-extrusion, the die further comprises a pretreatment of at least the surface and the bottom surface of the strength layer 110, wherein the pretreatment comprises the following process steps:
s1, passing the strength layer 110 through a hot roller 500, and carrying out heat treatment on the surface and the bottom of the strength layer 110, wherein the heat treatment temperature is 20-50 ℃ lower than the co-extrusion temperature, for example, when the extrusion temperature is 150 ℃, the heat treatment (hot roller 500) temperature is 100 ℃, or when the extrusion temperature is 160 ℃, the heat treatment (hot roller 500) temperature is 140 ℃; the feeding speed of the main conveying line is 0.15-0.25 m/s, so that the temperature of the thickness of 1 +/-0.2 mm on the surface and the bottom of the strength layer 110 reaches the heat treatment temperature.
S2, enabling the strength layer 110 to pass through a sponge roller 600, collecting room-temperature water on the sponge roller 600, and carrying out wet treatment on the surface and the bottom of the strength layer 110 with certain temperature.
And S3, the strength layer 110 is subjected to polishing head 700, and the surface and the bottom surface of the strength layer 110 are subjected to connection surface roughening treatment, wherein in the embodiment, the polishing head 700 is a polishing head with 4 DuPont wire balls, and the diameter of the DuPont wire of each DuPont wire ball is 0.2 mm.
Table 1 is a comparison table of the product performance of the co-extruded artificial board manufactured by the single-sided co-extrusion process and the co-extruded artificial board manufactured by the double-sided co-extrusion process in example 1.
Table 2 is a comparison table of the product performance of the co-extruded wood-based panels of examples 2 to 4. To facilitate comparison of the properties, the product of the three examples was selected to have a total thickness of 18 mm. One of ordinary skill in the art will recognize from the above explanation that other combinations of thickness specifications are possible. For example, the strength layer 110 may have a thickness of 23.0mm, the finish layer 120 on the surface may have a thickness of 5.5mm, and the finish layer 120 on the bottom may have a thickness of 3.5 mm; or the strength layer 110 may have a thickness of 40.0mm, the treated layer 120 coated on the surface may have a thickness of 8.0mm, and the treated layer 120 coated on the bottom surface may have a thickness of 5.0 mm.
The control group 1 is a multilayer plywood (commercially available) with the thickness of 18mm, the control group 2 is a wood-plastic board with the thickness of 18mm (commercially available, the main material and the ingredients are consistent with the main material and the ingredients adopted by the treatment layer in the embodiment of the application), and the control group 3 is a wood-plastic-plywood composite artificial board (commercially available, the main material and the ingredients of wood plastic are consistent with the main material and the ingredients adopted by the treatment layer in the embodiment of the application) with the thickness of 18 mm.
The test method of the wood breakage rate is executed by referring to JAS (first-class Standard for structural plywood).
TABLE 1 comparison table of the product Properties of the Co-extruded Artificial Board of example 1
TABLE 2 comparison table of the product performance of the co-extruded wood-based panels of examples 2 to 4
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The co-extrusion artificial board comprises a strength layer (110) and a treatment layer (120) at least covering the surface of the strength layer (110), and is characterized in that the strength layer (110) is a wood material layer, the treatment layer (120) is a co-extrusion material layer, and the strength layer (110) and the treatment layer (120) are combined through a co-extrusion process.
2. The artificial co-extruded board according to claim 1, further comprising a bonding layer (130) for bonding the strength layer (110) and the handling layer (120), wherein the strength layer (110) and the bonding layer (130) and the handling layer (120) are bonded by a co-extrusion process.
3. The artificial co-extruded board according to claim 1 or 2, wherein the treatment layer (120) covers the surface, the bottom surface, and two side surfaces of the strength layer (110).
4. The co-extruded artificial board according to claim 1 or 2, wherein the treatment layer (120) is disposed to cover the surface and bottom surface of the strength layer (110).
5. The co-extruded artificial board according to claim 1, wherein the strength layer (110) is a plywood layer and the treatment layer (120) is a wood-plastic material layer.
6. The co-extruded artificial board according to claim 1, wherein the thickness of the strength layer (110) is 8.0-40.0 mm, and the thickness of the treatment layer (120) is 1.0-8.0 mm.
7. A method for manufacturing a co-extruded artificial board according to claim 1, wherein the strength layer (110) is continuously fed into the center of a co-extrusion die (400), and simultaneously the co-extruded material for forming the treatment layer (120) is continuously fed into the die (400), and the co-extruded material flows at least to the surface of the strength layer (110) in the die (400) and is co-extruded to form the treatment layer (120) interconnected with the strength layer (110).
8. A method for manufacturing a co-extruded artificial board according to claim 7, wherein an adhesive is continuously fed into the mould (400) and flows between the strength layer (110) and the co-extruded material, and is co-extruded with the strength layer (110) and the co-extruded material to form a bonding layer (130) for connecting the strength layer (110) and the treatment layer (120).
9. The method of manufacturing a co-extruded artificial board according to claim 7, wherein the co-extruded material is wrapped around the strength layer (110) in the mold (400) and extruded together to form the treatment layer (120) wrapped around the surface, bottom and two sides of the strength layer (110).
10. A method for manufacturing a co-extruded artificial board according to claim 9, further comprising a pretreatment of at least the surface and bottom surface of the strength layer (110) before co-extrusion, wherein the pretreatment comprises the following process steps:
s1, carrying out heat treatment on the surface and the bottom surface of the strength layer (110) to enable the temperature of the thickness of 0.5-1.5 mm on the surface and the bottom surface of the strength layer (110) to reach a heat treatment temperature, wherein the heat treatment temperature is 20-50 ℃ lower than the co-extrusion temperature;
s2, carrying out wet treatment on the surface and the bottom surface of the strength layer (110);
and S3, carrying out connection surface roughening treatment on the surface and the bottom surface of the strength layer (110).
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| CN104631758A (en) * | 2015-01-13 | 2015-05-20 | 东北林业大学 | Wood-plastic composite floor and manufacturing method thereof |
| CN105150644A (en) * | 2015-07-17 | 2015-12-16 | 安徽国风木塑科技有限公司 | Co-extruded wood-plastic composite material |
| CN106515156A (en) * | 2016-10-27 | 2017-03-22 | 东北林业大学 | Extruded sandwich structure wood-plastic composite material and manufacturing method thereof |
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