Wood-based veneer light-weight high-strength hollow column and preparation method thereof

Abstract

The application discloses a light-weight high-strength hollow cylinder of wood veneer, which is composed of 2-16 same arc-shaped wood veneers, 2-16 same arc-shaped fiberboards, plastic boards, metal plates and inorganic plates as structural units; the arc-shaped wood veneers and other arc-shaped material plates are alternately arranged or alternately staggered to form 2-16 cylinder components; and the cylinder components are connected through tenon and groove or staggered joint to form a hollow cylinder; the application improves the bonding strength and reduces the amount of glue through plasma treatment; the hollow cylinder has better comprehensive performance through combination of different materials; the manufacturing difficulty and cost of the hollow cylinder are reduced based on the manufacturing of 1 / 2-1 / 16 cylinder; the production efficiency is improved through hot-pressing curing technology; the manufacturing process is simple and efficient; the product is light in weight, high in strength, easy to process and assemble; the product can be used for indoor decoration and building components, and can also be used for pipe manufacturing, and can replace traditional pipes made of steel, cement and plastic.

Description

Technical Field

[0001] This invention relates to a lightweight, high-strength hollow column made of wood veneer and its preparation method, belonging to the field of wood processing technology. Background Technology

[0002] Cylindrical wooden materials are widely used in interior decoration and building components. However, worldwide, the diameter and quality of logs are declining year by year, and the supply-demand imbalance is becoming increasingly prominent. It is becoming increasingly difficult to obtain large-diameter logs and high-quality logs with uniform texture that can be used for building support. By using modern wood processing technology to obtain large-diameter wooden cylinders, it is possible to make the most of small materials and optimize inferior materials.

[0003] There are existing technologies for manufacturing glued-laminated cylinders using engineered wood or glued laminated timber. Square engineered wood or glued laminated timber can be machined into cylinders, or strip finger-jointed wood can be glued together to obtain large-diameter hollow cylinders. However, in general, the processing is complex, the production cost is high, and the production efficiency is low.

[0004] Rotary-cut wood veneers are mainly used in plywood manufacturing. How to utilize existing wood veneer raw material resources to meet the demand for cylindrical wood materials is an urgent problem to be solved. This invention aims to provide a technical solution to this problem.

[0005] Because plywood uses veneer as its structural unit, it retains the porous characteristics of wood. At the same time, due to the cross-linking of wood grain during the installation process, the mechanical properties of the board are significantly better than those of particleboard and medium-density fiberboard. Solving the problem of homogenization through the research and development of new products, new technologies and new processes and promoting the high-quality development of the plywood industry is an urgent task for the industry. This invention aims to provide a technical solution to this technical problem.

[0006] Chinese Patent 200510088940.1 discloses artificial logs and their manufacturing methods. The artificial logs include a cylindrical wood core and multiple layers of veneer rolled and pressed around the wood core into a cylindrical shape. However, the artificial logs prepared by the above patent are not only heavy and inconvenient to transport, but also have poor bonding strength between the multiple layers of veneer, resulting in large warping of the artificial logs and poor aesthetics and practicality.

[0007] Chinese Patent 202211318364.5 discloses a hollow artificial log and its manufacturing method. The patent describes a process where a veneer is wound around a molding mold to form a shaped body. The shaped body is then hot-pressed and cured in a hot-pressing mold to obtain a hollow artificial log. However, the manufacturing method of the above patent is relatively complex and difficult. Summary of the Invention

[0008] To date, there is a lack of mature methods for producing lightweight, high-strength hollow columns made of wood veneer, and the related industry has been underdeveloped. In response to this situation, this invention provides a lightweight, high-strength hollow column made of wood veneer and its preparation method.

[0009] The lightweight, high-strength hollow column of the present invention is composed of 2-16 identical arc-shaped wood veneers, 2-16 identical arc-shaped fiberboard, plastic board, metal board, and inorganic board as structural units. The arc-shaped wood veneers are arranged alternately or staggeredly with other arc-shaped material boards to assemble 2-16 column components. The column components are assembled by mortise and tenon joints or staggered lap joints to form a hollow column with a diameter of 100-5000 mm and a wall thickness of 10-100 mm.

[0010] The column can be a cylinder, a cone, or a frustum.

[0011] This invention utilizes dried rotary-cut wood veneer as the main structural unit to produce lightweight, high-strength hollow columns. The wood veneer, after being spliced ​​into a single sheet, can meet the conventional length and diameter requirements of a cylinder. For example, it can be spliced ​​along the grain to the target length of the artificial log using a veneer splicing machine, and then spliced ​​across the grain to the target diameter of the artificial log using a veneer splicing machine. The veneer width is πd, where d is the diameter of the hollow cylinder.

[0012] The preparation method of the lightweight, high-strength hollow column of wood veneer of the present invention is as follows: (1) Process wood veneer, fiberboard, plastic board, metal board, and inorganic board into arc-shaped structural units; (2) The surface of the arc-shaped structural unit is treated with plasma, coated with glue, laid out and assembled, and hot-pressed to solidify and form 2-16 column components; (3) After applying glue, 2-16 column components are assembled into a cylinder by mortise and tenon joints or staggered overlapping, and then fixed and shaped by circumferential pressure. (4) The column is wrapped and covered with conventional kraft paper, impregnated paper, engineered wood or solid wood veneer.

[0013] The shaping process, specifically how wood veneer is constructed into cylinders, is one of the key aspects of this invention. This invention employs a step-by-step construction strategy, significantly reducing the manufacturing difficulty of the cylinders. First, based on the final diameter of the cylinder, 2-16 cylindrical components are manufactured. This process can be smoothly implemented using conventional plywood manufacturing technology, replacing the flatbed press with an arc-shaped press. Second, the cylindrical components are integrated through a circumferential connection, further simplifying the manufacturing process and reducing manufacturing difficulty.

[0014] Another technical challenge this invention addresses is how to avoid the defect of concentrated seams during the forming process of a cylinder. This invention avoids this defect by using mortise and tenon joints or staggered overlapping joints. For small-diameter cylinders, mortise and tenon joints are generally used, while for large-diameter cylinders, staggered overlapping joints with misaligned seams are generally used.

[0015] The main problem in the fabrication of large solid wood hollow cylinders based on engineered wood production technology is low production efficiency. The cylindrical components of this invention utilize thermosetting curing technology, which significantly improves production efficiency.

[0016] The beneficial effects of this invention are: 1. This invention uses solid wood veneer as raw material to manufacture hollow cylinders, which has low raw material cost and is easy to obtain.

[0017] 2. This invention is based on plywood production technology, which is mature and easy to industrialize.

[0018] 3. Currently, the equipment and technology for single-sheet assembly are relatively mature, and single-sheet splicing can meet the requirements of any diameter and any length of hollow cylinder.

[0019] 4. The cylindrical parts are formed in one piece according to the diameter and length requirements of the hollow cylinder. The production method and process are simple, the manufacturing cost is low, and the use of hot pressing curing technology improves production efficiency.

[0020] 5. The hollow cylindrical product of the present invention is lightweight, high-strength, easy to process and assemble. It can be used for interior decoration, building components, and pipe manufacturing. It can replace traditional pipes made of steel, cement, plastic and other materials, which is conducive to expanding the application market of single-panel products and improving the energy-saving and environmental protection performance of building materials. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a staggered, overlapping, wraparound integrated structure. Figure 2 This is a schematic diagram of a tenon-groove type encircling integration. Detailed Implementation

[0022] To better understand the technical solutions of the present invention, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0023] Example 1: As Figure 1As shown, 16 curved column components made of wood veneer and fiberboard are used to create hollow cylinders with a diameter of 5000 mm and a wall thickness of 100 mm, which are fabricated by staggered overlapping. 1. Structural unit preparation Wood veneer and fiberboard are produced by conventional methods. The wood veneer is 1.9 mm thick and is spliced ​​longitudinally and transversely according to conventional techniques. The fiberboard is 2.1 mm thick. The width of the wood veneer and fiberboard is 1 / 16 of the circumference of the cylinder and is pre-formed into an arc shape. 2. Preparation of cylindrical components After plasma-treated wood veneer and fiberboard are glued and laid out to form a blank, the grain of the two adjacent wood veneer layers is perpendicular, and the fiberboard and wood veneer are laid out in a staggered manner to form an overlap with the staggered seams evenly distributed. After hot pressing and curing, a 1 / 16 cylindrical part with a thickness of 100 mm is obtained. 3. Cylindrical integration Eight 1 / 16 cylindrical parts, after being glued at the overlapping parts, are assembled into a hollow semi-cylinder by overlapping. Two hollow semi-cylinders are then wrapped around each other and pressed to fix them into shape, thus producing a hollow cylinder. 4. Wrapping By wrapping impregnated paper around the surface of a hollow cylinder using conventional techniques, a hollow semi-cylinder with a diameter of 5000 mm and a wall thickness of 100 mm is obtained.

[0024] The resulting hollow cylinder can be applied in fields such as construction, water conservancy, municipal engineering, and transportation.

[0025] Example 2: As Figure 2 As shown, two cylindrical components made of wood veneer and thin steel sheet are joined together using mortise and tenon joints to create a hollow cylinder with a diameter of 100 mm and a wall thickness of 10 mm. 1. Structural unit preparation Wood veneer and thin steel plate are made by conventional methods. The wood veneer is 2.1 mm thick and is spliced ​​longitudinally and transversely according to conventional technology. The thin steel plate is 1.6 mm thick. The width of the wood veneer is 1 / 2 of the circumference of the cylinder and is pre-made into a semi-circle. The thin steel plate is also pre-made into a semi-circle. 2. Preparation of cylindrical components After plasma-treated surface treatment, wood veneer and thin steel plate are glued and then laid out to form a blank. Wood veneer is symmetrically laid with thin steel plate as core layer and the grain of adjacent wood veneer layers is perpendicular. The thin steel plate and wood veneer are offset by 10-20 mm to form a tenon and groove. After hot pressing and curing, a 1 / 2 cylindrical part with a wall thickness of 10 mm is obtained. 3. Cylindrical integration After the mortise and tenon joints are coated with glue, the half-cylinder component is assembled into a hollow cylinder through the mortise and tenon joints, and then fixed in shape after being wrapped and pressed. 4. Surface coating By applying impregnated paper to the surface of a hollow cylinder using conventional techniques, a hollow cylinder with a diameter of 100 mm and a wall thickness of 10 mm is obtained.

[0026] The resulting hollow cylinder can be used in the fields of decoration and construction.

[0027] Example 3: A hollow cylinder with a diameter of 300 mm and a wall thickness of 20 mm was prepared by staggered overlapping of a 1 / 3 cylindrical component made of wood veneer and fiberboard. 1. Structural unit preparation Wood veneer and fiberboard are produced by conventional methods. The wood veneer is 2.0 mm thick and is spliced ​​longitudinally and transversely according to conventional techniques. The fiberboard is 2.0 mm thick. The width of the wood veneer and fiberboard is 1 / 3 of the circumference of the cylinder and is pre-formed into an arc shape. 2. Preparation of cylindrical components After plasma-treated wood veneer and fiberboard are coated with adhesive, they are laid out and assembled symmetrically with the grain of adjacent wood veneer layers perpendicular. The fiberboard and wood veneer are uniformly staggered to form overlapping layers. The mixture is then hot-pressed and cured to form a 1 / 3 cylindrical component with a wall thickness of 30 mm.

[0028] 3. Cylindrical integration After the mortise and tenon joints are coated with glue, the 1 / 3 cylindrical component is assembled into a hollow cylinder through the mortise and tenon joints, and then fixed in shape after being wrapped and pressed.

[0029] 3. Surface lamination. Using conventional techniques, engineered wood is laminated onto the surface of the hollow cylinder to obtain a hollow cylinder with a diameter of 300 mm and a wall thickness of 30 mm.

[0030] The resulting hollow cylinder can be used in the fields of decoration and construction.

[0031] Example 4: A hollow cylinder with a diameter of 3000 mm and a wall thickness of 50 mm was prepared by staggered overlapping of a 1 / 8 cylindrical component made of wood veneer and plastic. 1. Structural unit preparation The wood veneer and plastic board are made using conventional methods. The wood veneer is 2.1 mm thick and is spliced ​​longitudinally and transversely using conventional techniques. The plastic board is 1.9 mm thick. The width of the wood veneer is 1 / 8 of the circumference of the cylinder and is pre-formed into an arc shape. The plastic board is pre-formed into an arc shape of 1 / 8 of the cylinder.

[0032] 2. Preparation of cylindrical components After plasma-treated wood veneer and curved plastic sheet are glued together, they are laid out to form a blank. The grain of the two adjacent wood veneer layers is perpendicular, and the curved plastic sheet is laid out in a staggered manner with the wood veneer overlapping and the staggered seams are evenly distributed. After hot pressing and curing, a 1 / 8 cylindrical part with a thickness of 50 mm is obtained.

[0033] 3. Cylindrical integration After the 1 / 8 cylindrical component with glue applied to the overlapping part is assembled into a hollow cylinder, it is then fixed in place by applying pressure around it.

[0034] 4. Wrapping. Using conventional techniques, wrap kraft paper around the surface of the hollow cylinder to obtain a hollow cylinder with a diameter of 3000 mm and a wall thickness of 50 mm.

[0035] The resulting hollow cylinder can be applied in fields such as water conservancy, municipal engineering, and transportation.

[0036] Example 5: A hollow cylinder with a diameter of 500 mm and a wall thickness of 30 mm was prepared by staggered overlapping of a 1 / 5 cylindrical component made of wood veneer, fiberboard, and gypsum board. 1. Structural unit preparation Wood veneer, fiberboard, and gypsum board are produced by conventional methods. The wood veneer is 2.0 mm thick and is spliced ​​longitudinally and transversely using conventional techniques. The fiberboard and gypsum board are 2.0 mm thick. The width of the wood veneer and fiberboard is 1 / 5 of the circumference of the cylinder and is pre-formed into an arc shape. The gypsum board is pre-formed into a 1 / 5 arc shape.

[0037] 2. Preparation of cylindrical components After plasma-treated surface treatment, wood veneer and fiberboard are glued and then laid out to form a blank. The grain of adjacent wood veneer layers is perpendicular, and the wood veneer and fiberboard are laid out in a staggered manner to form an overlap with the staggered seams evenly distributed. After hot pressing and curing, a 1 / 5 cylindrical component with a thickness of 28 mm is obtained. Then, an arc-shaped gypsum board is attached to the outermost layer to obtain a 1 / 5 cylindrical component with a thickness of 30 mm.

[0038] 3. Cylindrical integration After the 1 / 5 cylindrical component with glue applied to the overlapping part is assembled into a hollow cylinder, it is then fixed and molded by wrapping and pressing.

[0039] 4. Surface coating By applying kraft paper to the surface of a hollow cylinder using conventional techniques, a hollow cylinder with a diameter of 500 mm and a wall thickness of 30 mm is obtained.

[0040] The resulting hollow cylinder can be used in fields such as interior decoration.

[0041] Example 6: A hollow cone with a diameter of 1000 mm and a wall thickness of 36 mm was prepared by staggered overlapping of a 1 / 4 cylindrical component made of wood veneer, fiberboard, and gypsum board. 1. Structural unit preparation The wood veneer and fiberboard are produced by conventional methods. The wood veneer is 2.0 mm thick and is spliced ​​longitudinally and transversely using conventional techniques. The fiberboard is 2.0 mm thick. The bottom width of the triangular wood veneer and fiberboard is 1 / 4 of the circumference of the cone.

[0042] 2. Preparation of the conical component After plasma-treated surface treatment, wood veneer and fiberboard are glued and then laid out to form a blank. The grain of adjacent wood veneer layers is perpendicular, and the wood veneer and fiberboard are laid out in a staggered manner to form an overlap with the staggered seams evenly distributed. After hot pressing and curing, a 1 / 4 cone component with a thickness of 36 mm is obtained.

[0043] 3. Conical integration After the overlapping parts are glued, the 1 / 4 cone components are assembled into a hollow cone by overlapping, and then fixed by circumferential pressure.

[0044] 4. Surface lamination. Kraft paper is laminated onto the surface of the hollow cone using conventional techniques to obtain a hollow cone with a diameter of 1000 mm and a wall thickness of 36 mm.

[0045] The resulting hollow cone can be applied to fields such as construction, for example, it can be quickly assembled into pointed tents.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lightweight, high-strength hollow column made of wood veneer, characterized in that: The structural unit consists of one or more of the following: 2-16 identical curved wood veneers, 2-16 identical curved fiberboard, plastic board, metal board, and inorganic board. The curved wood veneers are arranged alternately or staggeredly with other curved material boards to form 2-16 column components. The column components are assembled into hollow columns with a diameter of 100-5000 mm and a wall thickness of 10-100 mm by mortise and tenon joints or staggered lap joints.

2. The lightweight, high-strength hollow column of wood veneer type according to claim 1, characterized in that: The cylinder can be a cylinder, a cone, or a frustum.

3. The method for preparing the lightweight, high-strength hollow column of wood veneer as described in claim 1 or 2, characterized in that, The steps are as follows: (1) Process wood veneer, fiberboard, plastic board, metal board, and inorganic board into arc-shaped structural units; (2) The surface of the arc-shaped structural unit is treated with plasma, coated with glue, laid out and assembled, and hot-pressed to solidify and form 2-16 column components; (3) After applying glue, 2-16 column components are assembled into a cylinder by mortise and tenon joints or staggered overlapping, and then fixed and shaped by circumferential pressure. (4) The column is wrapped and covered with conventional kraft paper, impregnated paper, engineered wood or solid wood veneer.

4. The preparation method according to claim 3, characterized in that... The hot press used for hot pressing curing molding has upper and lower pressure plates that are corresponding to each other in arc shape and whose surface shape corresponds to the overlapping method.

5. The preparation method according to claim 3, characterized in that... The surface covering and cylindrical integration can be carried out simultaneously or in stages, and the device used is an upper and lower pressure plate or a left and right pressure plate that are corresponding arc-shaped pressure devices.

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