A manufacturing method of a bamboo-wood composite cylinder

Abstract

The present invention provides a manufacturing method for a bamboo-wood composite cylinder, which relates to the technical field of bamboo processing and comprises the following steps: Step 1, processing a bamboo blank into a cylinder blank with a specified length; Step 2, applying glue to a wooden veneer with a specific thickness and then winding and fixing it around the cylinder blank under pressure, and obtaining an equal-diameter cylinder after curing; Step 3, applying glue to multiple wooden veneers with a specific thickness one by one and then winding and fixing them around the equal-diameter cylinder to obtain a formed cylinder blank; Step 4, placing the formed cylinder blank in a hot press for hot pressing and curing to obtain a formed cylinder. The bamboo-wood composite cylinder obtained by the manufacturing method provided by the present invention retains the natural hollow structure of bamboo, has a light weight, a high static bending modulus of elasticity, and high strength, and can be not only applied to interior decoration but also used as building structure members.

Description

Technical Field

[0001] The present invention relates to the technical field of bamboo processing, and particularly to a manufacturing method of a bamboo-wood composite cylinder. Background Art

[0002] Humans have used bamboo as a building material for thousands of years, and the Chinese nation has the longest history of planting and using bamboo. In recent years, the diameter of raw logs has been continuously decreasing and the quality of wood has been continuously deteriorating, so bamboo has attracted much attention as a building material. In addition to raw bamboo and bamboo plywood, bamboo laminated lumber and recombined bamboo are the most common bamboo building materials at present. Among them, the processing method of bamboo laminated lumber is similar to that of wood laminated lumber. First, raw bamboo is processed into bamboo strips, and after drying, gluing, and assembling the blanks, square timbers and boards are formed by gluing and pressing. Recombined bamboo uses moso bamboo with a growth period of more than three years and a diameter of less than 80 mm as raw materials, and is processed into bamboo bundles that are continuously unbroken transversely and loosely and cross-connected longitudinally by a rolling and rubbing device, and then dried, sized, and hot-pressed into materials. Both bamboo laminated lumber and recombined bamboo have excellent physical and mechanical properties, and have the advantages of small water absorption expansion coefficient, no cracking, and no deformation, and are excellent building materials.

[0003] Common bamboo building materials such as bamboo plywood, bamboo laminated lumber, recombined bamboo, and bamboo oriented strand board that has emerged in recent years all damage the natural hollow structure of bamboo, and the characteristics and advantages of raw bamboo itself are not retained and fully utilized.

[0004] Large clumping bamboos are bamboo species with unique characteristics and advantages in China, especially in provinces such as Yunnan. For example, the giant bamboo is the largest bamboo in the world, with a culm height of more than 40 meters, a diameter of up to 30 cm, and an annual bamboo yield per mu of up to 5 tons. It is known as the "king of bamboos and the world's best", with extremely high economic value and broad development prospects. If traditional bamboo processing technology is used, not only the natural hollow structure of bamboo is damaged, but also the processing difficulty is large, the production efficiency is low, and the production cost is high.

[0005] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] The purpose of the present invention is to provide a manufacturing method of a bamboo-wood composite cylinder to solve the problems existing in the above-mentioned prior art, retain the hollow structure of bamboo, and have a simple and feasible process, high efficiency.

[0007] To achieve the above purpose, the present invention provides the following solution:

[0008] The present invention provides a manufacturing method of a bamboo-wood composite cylinder, including the following steps:

[0009] Step 1: Process a bamboo blank into a cylinder blank with a specified length;

[0010] Step 2: Apply glue to the wooden veneer with a specific thickness, then wrap and form it around the cylindrical blank and press to fix it. After curing, an equal-diameter cylinder is obtained.

[0011] Step 3: Apply glue to multiple wooden veneers with a specific thickness one by one, then wrap and form them around the equal-diameter cylinder and fix them to obtain a formed cylindrical blank.

[0012] Step 4: Place the formed cylindrical blank in a hot press for hot pressing and curing to obtain a formed cylinder.

[0013] Preferably, when the diameter of the required bamboo-wood composite cylinder is relatively large, repeat the operations of Step 3 and Step 4 multiple times until a bamboo-wood composite cylinder with the target diameter is obtained.

[0014] Preferably, between Step 1 and Step 2, there is also a carbonization step for the cylindrical blank: subject the cylindrical blank to high-temperature carbonization treatment.

[0015] Preferably, in Step 1, after sawing the bamboo blank into bamboo segments with a specified length, place the bamboo segments on a non-card shaft veneer lathe for fixed-axis rotation to obtain a cylindrical blank.

[0016] Preferably, the length of the cylindrical blank is 2.5 - 5 m, and the diameter is 10 - 30 cm.

[0017] Preferably, the length of the wooden veneer is the same as that of the bamboo segment, the width is 3.14 times the diameter of the cylindrical blank, the thickness is 0.5 - 3.0 mm, the moisture content is 6 - 15%, and the single-sided glue application amount of the wooden veneer is 100 - 200 g / m 2 。

[0018] Preferably, the adhesive for gluing the wooden veneer is one or more of isocyanate adhesives, melamine-modified urea formaldehyde resin adhesives, and phenolic resin adhesives.

[0019] Preferably, the pressing method used in Step 2 is clamp pressing, and through environmental curing, the curing environmental temperature is 60 - 200 °C.

[0020] Preferably, the unit pressure of the hot press for hot pressing is 1.5 - 5 MPa, the hot pressing temperature is 150 - 200 °C, and the hot pressing time is 10 - 60 seconds per millimeter.

[0021] Preferably, the hot press is a cylindrical hot press, and the hot press is composed of two semi-circular pressing plates up and down, with its length being the length of the bamboo segment and the radius being the radius of the formed cylinder.

[0022] The present invention has achieved the following technical effects compared with the prior art:

[0023] The bamboo-wood composite cylinder obtained by the manufacturing method provided by the present invention retains the natural hollow structure of bamboo, is light in weight, has a high static bending elastic modulus and high strength, and can be applied not only to interior decoration but also to building structural components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagrams in each manufacturing process when making a bamboo-wood composite cylinder from a bamboo blank;

[0026] Figure 2 For Figure 1 front view;

[0027] In the figure: 1 - bamboo blank; 2 - bamboo section; 3 - cylindrical blank; 4 - equal-diameter cylinder; 5 - formed cylindrical blank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a manufacturing method for a bamboo-wood composite cylinder to solve the problems existing in the above-mentioned prior art, retain the hollow structure of bamboo, and have a simple and feasible process and high efficiency.

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0031] The present invention provides a manufacturing method for a bamboo-wood composite cylinder, as shown in Figure 1 and Figure 2 shown, including the following steps:

[0032] Step 1: Process the bamboo blank 1 into a cylindrical blank 3 with a specified length; specifically, after sawing the bamboo blank 1 into bamboo sections 2 with a specified length, place the bamboo sections 2 on a non-card shaft rotary cutting machine for fixed-axis rotation to obtain the cylindrical blank 3, and the cutting method is not limited to sawing.

[0033] The cylindrical blank 3 is used to eliminate the shape differences of the raw bamboo and remove the bamboo green, providing a cylinder with a consistent shape and an easily glueable surface for subsequent processing.

[0034] Preferably, the length of the cylindrical blank 3 is 2.5 - 5 m, and the diameter is 10 - 30 cm.

[0035] Step 2: After applying glue to a wooden veneer with a specific thickness, it is wound around the cylindrical blank 3 to form a shape and fixed under pressure. After curing, an equal-diameter cylinder 4 is obtained. Through equal-diameter processing, the efficiency of subsequent processing techniques can be improved.

[0036] Step 3: After applying glue to multiple wooden veneers with a specific thickness one by one, they are wound around the equal-diameter cylinder 4 to form a shape and fixed, obtaining a formed cylindrical blank 5.

[0037] Step 4: The formed cylindrical blank 5 is placed in a hot press for hot pressing and curing to obtain a formed cylinder.

[0038] The bamboo blank 1 itself has a hollow structure. Therefore, the bamboo-wood composite cylinder obtained by the manufacturing method provided by the present invention retains the natural hollow structure of the bamboo, and has a light weight, a high static bending modulus of elasticity, and high strength. It can be used not only for interior decoration but also for building structural components.

[0039] In some embodiments, when the diameter of the required bamboo-wood composite cylinder is relatively large, the operations of Step 3 and Step 4 are repeated multiple times until a bamboo-wood composite cylinder with the target diameter is obtained.

[0040] The manufacturing method provided in this embodiment can be applied to the manufacturing of bamboo-wood composite cylinders with larger diameters.

[0041] In some embodiments, between Step 1 and Step 2, there is also a carbonization step for the cylindrical blank 3: the cylindrical blank 3 is subjected to high-temperature carbonization treatment.

[0042] The manufacturing method provided in this embodiment uses high-temperature carbonization treatment to endow the cylindrical blank 3 with excellent anti-corrosion performance and dimensional stability.

[0043] In some embodiments, the length of the wooden veneer is the same as the length of the bamboo section 2, the width is 3.14 times the diameter of the cylindrical blank 3, the thickness is 0.5 - 3.0 mm, the moisture content is 6 - 15%, preferably 10%, and the single-sided glue application amount of the wooden veneer is 100 - 200 g / m 2 。

[0044] In some embodiments, the adhesive used for gluing the wooden veneer is one or more of isocyanate adhesives, melamine-modified urea formaldehyde resin adhesives, and phenolic resin adhesives.

[0045] In some embodiments, the pressing method used in step two is fixture pressing, and through ambient curing, the ambient temperature for curing is 60 to 200 °C, preferably 120 °C.

[0046] In some embodiments, the unit pressure of hot pressing by the hot press is 1.5 to 5 MPa, the hot pressing temperature is 150 to 200 °C, preferably 180 °C, and the hot pressing time is 10 to 60 seconds per millimeter.

[0047] In some embodiments, the hot press is a cylindrical hot press, which is composed of two upper and lower semi-circular pressing plates, and its length is the length of bamboo section 2, and the radius is the radius of the formed cylinder.

[0048] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A manufacturing method of a bamboo-wood composite cylinder, characterized in that, it includes the following steps: Step 1: Process the bamboo blank into a cylinder blank with a specified length; Step 2: Apply glue to a wooden veneer with a specific thickness, then wrap and form it around the cylinder blank and press to fix it. After curing, an equal-diameter cylinder is obtained; Step 3: Apply glue to multiple wooden veneers with a specific thickness one by one, then wind and form them around the equal-diameter cylinder and fix them to obtain a formed cylinder blank; Step 4: Place the formed cylinder blank in a hot press for hot pressing and curing to obtain a formed cylinder; The length of the wood veneer is the same as that of the bamboo section, the width is 3.14 times the diameter of the cylindrical blank, the thickness is 0.5 to 3.0 mm, the moisture content is 6 to 15%, and the single-sided glue application amount of the wood veneer is 100 to 200 g / m 2 .

2. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: When the diameter of the required bamboo-wood composite cylinder is relatively large, repeat the operations of Step 3 and Step 4 multiple times until a bamboo-wood composite cylinder with the target diameter is obtained.

3. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: Between Step 1 and Step 2, it further includes a carbonization step of the cylinder blank: perform high-temperature carbonization treatment on the cylinder blank.

4. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: In Step 1, after sawing the bamboo blank into bamboo segments with a specified length, place the bamboo segments on a non-card shaft rotary cutting machine for fixed-axis rotation to obtain a cylinder blank.

5. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: For the cylinder blank, its length is 2.5 - 5 m, and its diameter is 10 - 30 cm.

6. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: The adhesive for applying glue to the wooden veneer is one or more of isocyanate adhesives, melamine-modified urea formaldehyde resin adhesives, and phenolic resin adhesives.

7. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: The pressing method used in Step 2 is fixture pressing, and through environmental curing, the curing environmental temperature is 60 - 200 °C.

8. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: The unit pressure of hot pressing of the hot press is 1.5 - 5 MPa, the hot pressing temperature is 150 - 200 °C, and the hot pressing time is 10 - 60 seconds per millimeter.

9. The manufacturing method of the bamboo-wood composite cylinder according to claim 1, characterized in that: The hot press is a cylindrical hot press, and the hot press is composed of two semi-circular pressing plates up and down, whose length is the length of the bamboo segment, and the radius is the radius of the formed cylinder.

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