Preparation method of plastic shaving board capable of being routed and milled

Abstract

The invention belongs to the technical field of artificial boards, and relates to a preparation method of a plastic shaving board capable of being routed and milled, which comprises the following steps: raw wood preparation, chipping, screening, flaking, drying, screening, gluing, paving, pre-pressing, hot pressing, cooling, sanding, inspection and warehousing, the thickness of the surface layer accounts for 25-40% of the total thickness of the slab, and the thickness of the core layer accounts for 20-50% of the total thickness of the slab; in the flaking process, the screening value of the wood flour or the fine wood shavings is 100-300 meshes; in the sizing process, a surface layer adhesive is one or more of a water-based hot melt adhesive, urea-formaldehyde resin and isocyanate, and a core layer adhesive is one or more of urea-formaldehyde resin and isocyanate. According to the prepared plastic shaving board capable of being routed and milled, the proportion of the surface layer breaks through the traditional limit, meanwhile, the water-based hot melt adhesive is adopted, 3D mold pressing molding can be conducted while the routing effect is achieved, and the strength and the mechanical property of the board are guaranteed through large wood shavings in the core layer.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial boards, relates to particle boards, and in particular to a preparation method of a plastic and millable particle board. Background Art

[0002] Particleboard is a type of man-made board made by processing wood or non-wood plant fiber raw materials into shavings (or fragments), applying adhesives (and other additives), assembling and forming, and hot pressing. According to the China Wood-Based Panel Industry Report, China's particleboard production in 2022 was 38.79 million cubic meters, accounting for 13.5% of the country's total wood-based panel production, an increase of 1.7% year-on-year. In the past ten years, China's particleboard production has grown at an average annual rate of 5.1%. Particleboard has a small amount of glue applied during the production process, low density, and lower energy consumption than other types of boards. At the same time, the surface is flat and smooth, and the load-bearing capacity is good, so it is widely used in home manufacturing and interior decoration.

[0003] The particleboard on the market is basically only suitable for flat decoration and modeling. Due to the influence of its particle structure and sheet size, the particleboard cannot be milled and processed, which limits its development. At present, the demand for millable particleboard in the custom home furnishing industry is growing rapidly, which further puts forward higher requirements on the surface performance of particleboard. In addition to being environmentally friendly and having excellent mechanical properties, it should also have good milling and surface 3D modeling effects. Therefore, it is very necessary to develop a new type of particleboard that can be milled and has 3D modeling.

[0004] The present invention develops a novel preparation method of particleboard, and the prepared particleboard can be milled and 3D-shaped and finished, thereby further expanding the application of particleboard in the field of home furnishing. Summary of the invention

[0005] In order to enhance the surface mechanical properties of particleboard, the invention discloses a method for preparing plasticity and millable particleboard.

[0006] Technical Solution

[0007] A method for preparing a plastic and millable particleboard, comprising: logs → chipping → screening → slicing → drying → screening → gluing → paving → pre-pressing → hot pressing → cooling → sanding → inspection → storage, wherein:

[0008] In the paving process, the slab is paved in layers according to the surface layer, the core layer, and the surface layer, wherein the surface layer is wood powder or fine wood shavings, the core layer is large wood shavings, the thickness of the surface layer accounts for 25-40% of the total thickness of the slab, preferably 30%, and the thickness of the core layer accounts for 20-50% of the total thickness of the slab, preferably 40%;

[0009] In the flaking process, the screening value of the wood powder or fine shavings is 100-300 meshes, preferably 200 meshes, and the core layer large shavings are 40-70 mm long, 0.5-60 mm wide, and 0.5-8 mm thick;

[0010] In the gluing process, the surface adhesive is one or more of water-based hot melt adhesive, urea-formaldehyde resin, and isocyanate, preferably water-based hot melt adhesive, wherein the water-based hot melt adhesive is applied in an amount of 2% to 10%, and the urea-formaldehyde resin and isocyanate are applied in an amount of 0% to 5%; the core layer adhesive is one or more of urea-formaldehyde resin and isocyanate, which are conventionally applied.

[0011] In the preferred disclosed examples of the present invention, in the gluing process, the water-based hot melt adhesive is one or more of water-based polyurethane hot melt adhesive, water-based EVA hot melt adhesive, water-based polyacrylate hot melt adhesive, water-based polyester resin hot melt adhesive, and water-based polyamide resin hot melt adhesive, preferably water-based polyacrylate hot melt adhesive.

[0012] In traditional three-layer particleboard, the ratio of surface layer: core layer: surface layer is basically 13% to 25%: 50% to 74%: 13% to 25%, and the thickness of the surface layer is generally not more than half of the thickness of the core layer. Therefore, the surface layer of the particleboard cannot achieve the 3D finishing effect of milling and molding. The particleboard prepared by the present invention further increases the proportion of the surface layer in the three-layer structure, and the use of wood powder or fine shavings can achieve the decorative effect of milling thick surface smooth and burr-free. At the same time, the surface layer adopts water-based hot melt adhesive, which can make the surface layer change from flat to 3D decorative effect during the post-processing molding process, realize the plasticity function of the particleboard, and expand the application of particleboard in the field of home decoration. The use of large shavings in the core layer can reduce the impact of the reduction of mechanical strength due to the increase in the proportion of the surface layer, and meet the basic mechanical performance indicators of the particleboard.

[0013] Beneficial Effects

[0014] Compared with the traditional three-layer particleboard, the plastic and millable particleboard prepared by the present invention has a surface ratio that breaks through the traditional limit, and uses water-based hot melt adhesive, which can achieve the milling effect and 3D molding at the same time. The large pieces of shavings in the core layer ensure the strength and mechanical properties of the board, while the production cost and formaldehyde emission are low, the operation is simple and easy to implement, and the use scope of particleboard in the field of surface decoration and modeling can be expanded. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0016] Example 1

[0017] A production process of plastic and millable particleboard, including: logs → chipping → screening → flaking → drying → screening → gluing → paving → pre-pressing → hot pressing → cooling → sanding → inspection → storage, wherein: in the paving process, the surface layer, core layer, and surface layer are layered and paved, the surface layer is wood powder, and the core layer is large flakes. The thickness of the surface layer accounts for 30% of the total thickness of the slab, and the thickness of the core layer accounts for 40% of the total thickness of the slab. In the flaking process, the screening value of the wood powder is below 200 mesh, and the length of the large flakes of the core layer is 50-65mm, the width is 1-25mm, and the thickness is 5-8mm. In the gluing process, the surface layer adhesive is a water-based polyacrylate hot melt adhesive, the gluing amount is 4.2%, and the core layer adhesive is isocyanate.

[0018] The manufactured particleboard has up to standard mechanical properties and is plastic enough for engraving and milling.

[0019] Example 2

[0020] A production process of plastic and millable particleboard, including: logs → chipping → screening → flaking → drying → screening → gluing → paving → pre-pressing → hot pressing → cooling → sanding → inspection → storage, wherein: in the paving process, the surface layer, core layer, and surface layer are layered and paved, the surface layer is wood powder, and the core layer is large shavings. The thickness of the surface layer accounts for 38% of the total thickness of the slab, and the thickness of the core layer accounts for 24% of the total thickness of the slab. In the flaking process, the screening value of the wood powder is below 300 mesh, the length of the large shavings in the core layer is 45 to 70 mm, the width is 20 to 55 mm, and the thickness is 1 to 4 mm. In the gluing process, the surface layer adhesive is water-based polyurethane hot melt adhesive, the gluing amount is 3.5%, the gluing amount of urea-formaldehyde resin is 1%, and the core layer adhesive is urea-formaldehyde resin.

[0021] The manufactured particleboard has up to standard mechanical properties and is plastic enough for engraving and milling.

[0022] Example 3

[0023] A production process of plastic and millable particleboard, including: logs → chipping → screening → flaking → drying → screening → gluing → paving → pre-pressing → hot pressing → cooling → sanding → inspection → storage, wherein: in the paving process, the surface layer, core layer, and surface layer are layered and paved, the surface layer is wood powder, and the core layer is large shavings. The thickness of the surface layer accounts for 40% of the total thickness of the slab, and the thickness of the core layer accounts for 20% of the total thickness of the slab. In the flaking process, the screening value of the wood powder is below 150 mesh, the length of the large shavings in the core layer is 60-70 mm, the width is 5-35 mm, and the thickness is 1-4 mm. In the gluing process, the surface layer adhesive is a water-based polyamide hot melt adhesive, the glue application amount is 5%, and the core layer adhesive is isocyanate.

[0024] The manufactured particleboard has up to standard mechanical properties and is plastic enough for engraving and milling.

[0025] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing a plastic and millable particleboard, comprising: Logs → chipping → screening → flaking → drying → screening → gluing → laying → pre-pressing → hot pressing → cooling → sanding → inspection → storage, characterized by: In the paving process, the slab is paved in layers according to the surface layer, the core layer, and the surface layer, wherein the surface layer is wood powder or fine shavings, the core layer is large shavings, the thickness of the surface layer accounts for 25-40% of the total thickness of the slab, and the thickness of the core layer accounts for 20-50% of the total thickness of the slab, preferably 40%; In the flaking process, the screening value of the wood powder or fine shavings is 100-300 meshes, the core layer large shavings are 40-70 mm long, 0.5-60 mm wide, and 0.5-8 mm thick; In the gluing process, the surface adhesive is one or more of water-based hot melt adhesive, urea-formaldehyde resin, and isocyanate, wherein the water-based hot melt adhesive is applied in an amount of 2% to 10%, and the urea-formaldehyde resin and isocyanate are applied in an amount of 0% to 5%; the core layer adhesive is one or more of urea-formaldehyde resin and isocyanate, which are conventionally applied.

2. The method for preparing the plasticity-millable particleboard according to claim 1, characterized in that: During the paving process, the surface layer thickness accounts for 30% of the total thickness of the slab.

3. The method for preparing the plastic millable particleboard according to claim 1, characterized in that: During the paving process, the core layer thickness accounts for 40% of the total thickness of the slab.

4. The method for preparing the plasticity-millable particleboard according to claim 1, characterized in that: In the flaking process, the screening value of the wood powder or fine shavings is 200 meshes.

5. The method for preparing the plasticity-millable particleboard according to claim 1, characterized in that: In the gluing process, the surface adhesive is a water-based hot melt adhesive.

6. The method for preparing the plasticity-millable particleboard according to claim 1, characterized in that: In the gluing process, the water-based hot melt adhesive is one or more of water-based polyurethane hot melt adhesive, water-based EVA hot melt adhesive, water-based polyacrylate hot melt adhesive, water-based polyester resin hot melt adhesive, and water-based polyamide resin hot melt adhesive.

7. The method for preparing the plasticity-millable particleboard according to claim 6, characterized in that: In the gluing process, the water-based hot melt adhesive is a water-based polyacrylate hot melt adhesive.

8. A plastic, millable particleboard prepared according to the method of any one of claims 1 to 7.