Manufacturing method of special-shaped decorative engineering round bamboo

Abstract

The invention provides a method for manufacturing special-shaped decorative engineering round bamboos. The method comprises the steps that fixed-thickness bamboo jointed boards are sequentially subjected to steam injection treatment to obtain bent fixed-thickness bamboo jointed boards; then, the thickness of the fixed-thickness bamboo jointed board is not changed into the standard, the special-shaped bamboo jointed board is divided into bent round bamboo units with different widths in a parallel sawing mode, and a plurality of round bamboo design units used for assembling and splicing the special-shaped decoration engineering round bamboo are designed; and according to the width of each round bamboo design unit, sawing the bent fixed-thickness bamboo jointed board to obtain a plurality of bent bamboo units, then carrying out fixed-arc milling to obtain a plurality of special-shaped bamboo units, and finally, gluing, assembling and carrying out hot press molding to obtain the special-shaped decorative engineering round bamboo. The manufactured special-shaped decorative engineering round bamboo is a bent solid or hollow round bamboo component, the round bamboo component is a concentric round bamboo component or an eccentric round bamboo component, and the problems that the round bamboo is poor in shape designability, prone to rebound after being shaped, non-adjustable in density, non-adjustable in gravity center and the like are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bamboo material processing, and in particular relates to a method for manufacturing special-shaped decorative engineering round bamboo. Background Art

[0002] The processing of round bamboo components has a very long history, and there are mainly three forms: direct heating bending method, slotting bending method and industrial drying, bending and shaping integrated method.

[0003] Direct heating bending is suitable for processing bamboo bending parts with smaller diameters. Fire heating is one of the oldest processing methods. The round bamboo needs to be straightened before bending. Sometimes the bamboo partition needs to be opened and then filled with diamond sand to prevent the hot air in the cavity from expanding and damaging the round bamboo during the heating process. At the same time, the inner wall of the bent bamboo is not easy to be crushed during bending. When heating, the convex surface of the bending part should be heated. When the part to be bent is heated to produce bamboo oil, it should be bent slowly and forcefully into place, and immediately cooled and shaped with cold water.

[0004] With the development of science and technology, the traditional method of making round bamboo curved components is no longer suitable for the development requirements of modern furniture, decoration and other industries. The materials and properties of round bamboos with different outer diameters and different bamboo species vary greatly. The existing technology uses industrial processing tanks for drying and modification, and sets up processing workbenches in the processing tanks to prefabricate and shape straight and curved parts of round bamboo materials, process prefabricated components, and store the processed standard parts, etc., to achieve standardized and serialized production of round bamboo components. The existing engineering round bamboo is generally made of bamboo strips, which are directly cut according to the Figure 1 Assemble the blanks, mostly by hand, and then heat-press them into shape using a circular mold.

[0005] In addition, processing bamboo into round bamboo has high requirements for bamboo. For example, for bamboo ladders, the bamboo needs to be straightened and processed into round bamboo with good straightness; for round bamboo furniture, the bamboo needs to be processed into round bamboo components with different curvatures. In the prior art, round bamboo is usually bent or straightened by direct fire baking, or softening, heating bending, cooling and other methods such as those used in the patent with application number CN202010710898.7. This method of directly processing round bamboo has problems such as low industrialization level, low processing efficiency, and high defect rate of finished products. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for manufacturing special-shaped round bamboo for decorative engineering in view of the deficiencies of the above-mentioned prior art. The method can design single-arc, S-arc round bamboo components, solid or hollow, concentric circle or eccentric circle round bamboo components, and solves the problems of poor shape design of round bamboo, easy rebound after shaping, non-adjustable density, and non-adjustable center of gravity.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for manufacturing special-shaped decorative engineering round bamboo, characterized in that the special-shaped decorative engineering round bamboo is a curved solid or hollow round bamboo component, and the round bamboo component is a concentric round bamboo component or an eccentric round bamboo component, and the method comprises:

[0008] S1. According to the curvature of the round bamboo for special-shaped decorative engineering to be manufactured, the fixed-thickness bamboo plywood after the steaming treatment is required to be bent and shaped by hot pressing to obtain a curved fixed-thickness bamboo plywood;

[0009] When the round bamboo used for the special-shaped decorative project is a hollow round bamboo component, the thickness of the fixed-thickness bamboo splicing board is not less than the wall thickness of the hollow round bamboo component;

[0010] S2. According to the structure of the special-shaped decorative engineering round bamboo to be manufactured, the thickness of the curved fixed-thickness bamboo piecing board is used as a reference to split the special-shaped decorative engineering round bamboo by multi-layer parallel sawing, and multiple round bamboo design units for assembling the special-shaped decorative engineering round bamboo to be manufactured are designed; if the special-shaped decorative engineering round bamboo to be manufactured is a solid round bamboo component, after the multi-layer parallel sawing, it is necessary to saw again in the vertical direction to obtain multiple round bamboo design units of smaller specifications;

[0011] The plane of multi-layer parallel sawing is parallel to the bending axial plane of the special-shaped decorative engineering round bamboo;

[0012] According to the width of each round bamboo design unit, the curved fixed-thickness bamboo panels are sawed to obtain a plurality of curved bamboo units, and then according to the two side structures of each round bamboo design unit in the length direction, the two sides of the curved bamboo unit are selectively milled to obtain a plurality of special-shaped bamboo units, the special-shaped bamboo units having a structure similar to that of the round bamboo design unit;

[0013] S3, applying glue to each of the special-shaped bamboo units, assembling them in a mold according to the structure of the special-shaped decorative engineering round bamboo to be manufactured after the glue is dry, and hot-pressing them after the assembly is completed to obtain the special-shaped decorative engineering round bamboo.

[0014] Preferably, the plane of the multi-layer parallel sawing is parallel to the plane where the bending center axis of the special-shaped decorative engineering round bamboo is located.

[0015] Preferably, the curved hollow round bamboo component may be a hollow round bamboo component with a curved outer surface, a hollow round bamboo component with a curved inner surface, or a hollow round bamboo component that is curved as a whole, and the curved shape may be a single arc curve or an S-arc curve; the curved hollow round bamboo component may be a hollow round bamboo component with a curved outer surface, a hollow round bamboo component with a curved inner surface, or a hollow round bamboo component that is curved as a whole.

[0016] Preferably, in S1, the bamboo panels are flat-pressed bamboo panels and side-pressed bamboo panels. The thickness of the fixed-thickness bamboo panels is 3-5 mm. If the bamboo panels are flat-pressed bamboo panels, they can be divided into single-layer flat-pressed bamboo panels or multi-layer flat-pressed bamboo panels. The single-layer flat-pressed bamboo panels can be assembled and shaped to prepare multi-layer flat-pressed bamboo panels, thereby meeting the wall thickness requirements of the round bamboo for special-shaped decorative engineering.

[0017] The use of flat-pressed bamboo panels is suitable for manufacturing special-shaped decorative engineering round bamboos with small diameters, large deformation, large diameter-to-thickness ratio, good outer surface wear resistance, weak interface bonding performance, and low radial compressive resistance.

[0018] The side-pressed bamboo panels are suitable for manufacturing round bamboos with large diameters, small deformation, small diameter-to-thickness ratio, different outer surface hardness, striped colors, good decorative properties, stable interface bonding properties, and relatively high radial compressive resistance.

[0019] The combination of flat-pressed bamboo panels and side-pressed bamboo panels is suitable for manufacturing hollow special-shaped decorative engineering round bamboo with adjustable center of gravity.

[0020] Preferably, the bamboo plywood of fixed thickness can be manufactured into bamboo plywood of thickness 3-5mm from bamboo pieces of width 10-30mm and thickness 3-5mm according to the manufacturing process of bamboo integrated materials. The bamboo plywood is assembled in a single-layer manner, and the glue application amount of the single-layer flat-pressed bamboo plywood is 150-200g / m 2 , the glue amount of side pressed bamboo plywood is 250-300g / m 2 , in order to obtain better bonding performance and control formaldehyde emission.

[0021] Preferably, the temperature of the steaming treatment in S1 is 140°C-200°C, and the treatment time is 10-30min; during the steaming treatment, the steaming temperature of the bamboo green surface is 20°C higher than that of the bamboo yellow surface.

[0022] Preferably, the curvature of the shaping hot pressing described in S1 is the same as the curvature of the special-shaped decorative engineering round bamboo to be manufactured, and the pressure of the special-shaped hot pressing molding is 0.8-1.2MPa, the temperature is 130-145℃, and the insulation time is 30-40min; wherein the temperature of the fixed thickness bamboo panels entering and exiting during the special-shaped hot pressing molding does not exceed 110℃.

[0023] Preferably, the sawing plane in S2 is perpendicular to the curved surface of the special-shaped decorative engineering round bamboo to be manufactured; during milling, the moisture content of the curved bamboo unit is 3-8%, and the milling speed is 2000 rpm.

[0024] Preferably, the pressure of the hot pressing in S3 is 0.8-1.2 MPa, the temperature is 130-145° C., and the insulation time is 30-40 min. During the hot pressing, the temperature of the blank of the special-shaped decorative engineering round bamboo does not exceed 110° C. when entering and exiting.

[0025] Preferably, the special-shaped decorative engineering round bamboo is a single arc-shaped or S-shaped round bamboo component, or a solid or hollow round bamboo component, or a concentric circle or eccentric circle round bamboo component.

[0026] Preferably, the outer diameter of the special-shaped decorative engineering round bamboo to be manufactured is generally 50-150mm, and the 3-5mm fixed thickness bamboo plywood is used as a reference for multi-layer sawing and dividing the special-shaped decorative engineering round bamboo, and the number of sawing layers is between 15-50 layers, so as to obtain multiple round bamboo design units that can be assembled into special-shaped decorative engineering round bamboo.

[0027] Preferably, the mold in S3 consists of a mold base and a mold cover, and a mold cavity with the same shape as the special-shaped decorative engineering round bamboo blank is opened on the mold. The mold cavity is arranged in a horizontal direction, and the mold cavity consists of an upper mold cavity and a lower mold cavity. The upper mold cavity is arranged on the mold cover, and the lower mold cavity is arranged on the mold base. The circumferential angle of the lower mold cavity is 210°~270°.

[0028] Preferably, during the assembly in S3, when the special-shaped decorative engineering round bamboo is a hollow structure, a plurality of special-shaped bamboo units are assembled in the lower mold cavity from bottom to top along the horizontal direction to fit the inner wall of the lower mold cavity, and the assembly of the upper half of the blank is supported by a support hoop, and the shape of the support hoop matches the cross-sectional shape of the vertical center axis of the special-shaped decorative engineering round bamboo to be manufactured.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The present invention can design the round bamboo into a curved solid or hollow round bamboo component according to the application requirements of the special-shaped decorative engineering. The round bamboo component is a concentric round bamboo component or an eccentric round bamboo component. The curved hollow round bamboo component can be a hollow round bamboo component with a curved outer surface or a hollow round bamboo component with a curved inner surface or a hollow round bamboo component that is curved as a whole. The curved shape can be a single arc curve or an S-arc curve, which solves the problems of poor round bamboo shape design, easy rebound after shaping, non-adjustable density, and non-adjustable center of gravity. In addition, the assembly method is changed to a multi-layer segmentation design of round bamboo units, which is convenient for continuous layering and paving of round bamboos. It is also suitable for round bamboo components of various sizes and characteristics, and is expected to achieve industrial production.

[0031] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The following are pictures of three types of assembling methods used in the prior art to form round bamboo.

[0033] Figure 2 This is a schematic diagram of a bamboo plywood of fixed thickness in Example 1 of the present invention.

[0034] Figure 3 This is a schematic diagram of a curved bamboo board of fixed thickness in Example 1 of the present invention.

[0035] Figure 4 It is a schematic diagram of the sawing method in Example 1 of the present invention.

[0036] Figure 5 Schematic diagram of the special-shaped bamboo unit in Example 1 of the present invention.

[0037] Figure 6 This is an exploded view of the special-shaped bamboo unit assembly in Example 1 of the present invention.

[0038] Figure 7 This is an assembly diagram of the special-shaped decorative engineering round bamboo in Example 1 of the present invention.

[0039] Figure 8 Schematic diagram of the structure of the grinding tool used in Example 1 of the present invention.

[0040] Fig. 9 Schematic diagram of the structure of the mold base and the lower mold cavity in Example 1 of the present invention.

[0041] Fig.10 This is a real photo of the curved solid round bamboo according to Example 3 of the present invention.

[0042] Description of reference numerals:

[0043] 1—Mold base; 2—Mold upper cover; 3—Lower mold cavity; 4—Lower mold cavity. DETAILED DESCRIPTION

[0044] Example 1

[0045] This embodiment discloses a method for manufacturing a special-shaped decorative engineering round bamboo, wherein the special-shaped decorative engineering round bamboo is a single-arc hollow round bamboo component. The method for manufacturing the single-arc hollow round bamboo component includes:

[0046] S1, such as Figure 2 The fixed thickness bamboo plywood shown in the figure is first subjected to a steam spraying treatment, and then subjected to bending and shaping hot pressing according to the curvature requirements of the round bamboo for the special-shaped decorative engineering to be manufactured, to obtain the following Figure 3 The curved fixed thickness bamboo panels shown;

[0047] The fixed-thickness bamboo plywood is selected to have a thickness of 4 mm, and the bamboo plywood is a flat-pressed bamboo plywood;

[0048] The temperature of the steaming treatment is 170° C., and the treatment time is 20 minutes; during the steaming treatment, the steaming temperature of the bamboo green surface is 20° C. higher than that of the bamboo yellow surface.

[0049] The curvature of the shaping hot pressing is the same as the curvature of the special-shaped decorative engineering round bamboo to be manufactured. The pressure of the special-shaped hot pressing molding is 1.4MPa, the temperature is 140°C, and the insulation time is 35min; wherein the temperature of the fixed-thickness bamboo panels entering and exiting during the special-shaped hot pressing molding does not exceed 110°C.

[0050] S2, according to the structure of the special-shaped decorative engineering round bamboo to be manufactured, the thickness of the fixed-thickness bamboo plywood is 4mm as the reference, and multi-layer parallel sawing (specifically, parallel sawing 29 layers) is adopted (such as Figure 4 As shown in the figure, the special-shaped decorative engineering round bamboo is divided, and a plurality of round bamboo design units for assembling the special-shaped decorative engineering round bamboo are designed; the plane of the multi-layer parallel sawing is parallel to the plane where the bending center axis of the special-shaped decorative engineering round bamboo is located;

[0051] According to the width of each round bamboo design unit, the curved fixed thickness bamboo board is sawed to obtain a plurality of curved bamboo units, and then according to the two side structures of each round bamboo design unit, the two sides of the curved bamboo unit are fixed arc milled to obtain the following Figure 5 and Figure 6 The multiple special-shaped bamboo units shown have a similar structure to the multiple round bamboo design units;

[0052] The sawing plane is perpendicular to the curved surface of the special-shaped decorative engineering round bamboo to be manufactured; when milling, the moisture content of the curved bamboo unit is 5%, and the milling speed is 2000 rpm.

[0053] S3, apply glue to each of the special-shaped bamboo units, and after the glue is dry, assemble them in a mold in accordance with the structure of the special-shaped decorative engineering round bamboo, assemble multiple special-shaped bamboo units in the lower mold cavity from bottom to top along the horizontal direction to fit the inner wall of the lower mold cavity, and use a support hoop, the shape of the support hoop matches the cross-sectional shape of the vertical central axis of the special-shaped decorative engineering round bamboo to be manufactured, and the support hoop is convenient for fixing the special-shaped bamboo units of the upper half of the blank and supporting the special-shaped bamboo units of the upper half of the blank. Figure 7 As shown, after the assembly is completed, hot pressing is performed to obtain a special-shaped decorative engineering round bamboo, and then the end is cut and polished to obtain a qualified special-shaped decorative engineering round bamboo.

[0054] The pressure of hot pressing in S3 is 1 MPa, the temperature is 137°C, and the insulation time is 35 minutes. During hot pressing, the temperature of the blank of the special-shaped decorative engineering round bamboo does not exceed 110°C when entering and exiting.

[0055] The special-shaped decorative engineering round bamboo described in this embodiment is a single arc-shaped round bamboo component.

[0056] In this embodiment, Figure 8 and Fig. 9As shown, the mold in S3 is composed of a mold base 1 and a mold upper cover 2, and a mold cavity with the same shape as the special-shaped decorative engineering round bamboo blank is opened on the mold, and the mold cavity is arranged in a horizontal direction. The mold cavity is composed of an upper mold cavity 4 and a lower mold cavity 3. The upper mold cavity 4 is arranged on the mold upper cover 2, and the lower mold cavity 3 is arranged on the mold base 1. The circumferential angle of the lower mold cavity is 270°.

[0057] In this embodiment, the performance index of the prepared single arc round bamboo component is: using flat pressed bamboo plywood as raw material, the inner diameter of the manufactured product is 80mm-100mm, the product has good continuity of apparent bending lines, and the body density is 80-120kg / cm 3 According to the national standard GB / T 17657-2022 "Test methods for physical and chemical properties of artificial boards and veneer artificial boards - formaldehyde climate chamber test", the shear strength of the product glue layer is tested to be above 4.5MPa, and the formaldehyde emission is 0.8-1.1mg / L. According to the forestry industry standard "LY / T 2564-2015 Test methods for physical and mechanical properties of round bamboo", the radial load capacity of the product is tested to be 400-600N, and the ring stiffness is 500-750N / mm 2 The bending strength is 60-90MPa, and the mechanical properties become stronger as the diameter increases. The surface has good wear resistance like bamboo.

[0058] Example 2

[0059] This embodiment discloses a method for manufacturing a special-shaped decorative engineering round bamboo, wherein the special-shaped decorative engineering round bamboo is a hollow eccentric round bamboo component that is curved as a whole. The manufacturing method comprises:

[0060] S1, the fixed thickness bamboo plywood is first subjected to spray steaming treatment, and then bent and shaped according to the curvature requirements of the special-shaped decorative engineering round bamboo to be manufactured. Hot pressing to obtain a curved fixed thickness bamboo plywood;

[0061] The thickness of the fixed-thickness bamboo plywood is 3 mm; the bamboo plywood is a flat-pressed bamboo plywood and a side-pressed bamboo plywood, and there is a difference in density between the two bamboo plywoods, which is convenient for manufacturing an eccentric structure during the assembly process;

[0062] The temperature of the steaming treatment is 140° C., and the treatment time is 30 minutes; during the steaming treatment, the steaming temperature of the bamboo green surface is 20° C. higher than that of the bamboo yellow surface.

[0063] The curvature of the shaping hot pressing is the same as the curvature of the special-shaped decorative engineering round bamboo to be manufactured. The pressure of the special-shaped hot pressing molding is 1.2MPa, the temperature is 145°C, and the insulation time is 30min; wherein the temperature of the fixed-thickness bamboo panels entering and exiting during the special-shaped hot pressing molding does not exceed 110°C.

[0064] S2. According to the structure of the special-shaped decorative engineering round bamboo to be manufactured, the special-shaped decorative engineering round bamboo is divided by multi-layer parallel sawing based on the thickness of the fixed-thickness bamboo piecing board, and a plurality of round bamboo design units for assembling the special-shaped decorative engineering round bamboo are designed;

[0065] According to the width of each round bamboo design unit, the curved fixed-thickness bamboo panels are sawed to obtain a plurality of curved bamboo units, and then according to the two side structures of each round bamboo design unit, the two sides of the curved bamboo units are subjected to arc milling to obtain a plurality of special-shaped bamboo units, wherein the structures of the plurality of special-shaped bamboo units are similar to those of the plurality of round bamboo design units;

[0066] The sawing plane is perpendicular to the curved surface of the special-shaped decorative engineering round bamboo to be manufactured; when milling, the moisture content of the curved bamboo unit is 3%, and the milling speed is 2000 rpm.

[0067] S3, applying glue to each of the special-shaped bamboo units, and then assembling them in a mold according to the structure of the special-shaped decorative engineering round bamboo, hot pressing them after the assembly is completed to obtain the special-shaped decorative engineering round bamboo, and then cutting and polishing them to obtain qualified special-shaped decorative engineering round bamboo.

[0068] The pressure of hot pressing in S3 is 0.8MPa, the temperature is 145°C, and the insulation time is 30min. During hot pressing, the temperature of the blank of the special-shaped decorative engineering round bamboo does not exceed 110°C when entering and exiting.

[0069] The special-shaped decorative engineering round bamboo described in this embodiment is a single arc-shaped or S-shaped round bamboo component, or a solid or hollow round bamboo component, or a concentric circle or eccentric circle round bamboo component.

[0070] In this embodiment, the mold described in S3 is composed of a mold base and a mold cover, and a mold cavity with the same shape as the special-shaped decorative engineering round bamboo blank is opened on the mold. The mold cavity is composed of an upper mold cavity and a lower mold cavity. The upper mold cavity is arranged on the mold cover, and the lower mold cavity is arranged on the mold base. The circumferential angle of the lower mold cavity is 270°.

[0071] In this embodiment, the performance index of the prepared single arc round bamboo component is as follows. The flat pressed bamboo plywood and the side pressed bamboo plywood are used as raw materials to manufacture the product with an inner diameter of 80mm-100mm. The product has good continuity of the apparent bending line and a body density of 100-130kg / cm 3According to the national standard GB / T 17657-2022 "Test methods for physical and chemical properties of artificial boards and veneer artificial boards - formaldehyde climate chamber test", the shear strength of the product glue layer is tested to be above 5.2-5.5MPa, and the formaldehyde emission is 1.2-1.3mg / L. According to the forestry industry standard "LY / T 2564-2015 Test methods for physical and mechanical properties of round bamboo", the radial load capacity of the product is tested to be 600-700N, and the ring stiffness is 450--600N / mm 2 And the bending strength is 55-70MPa. The larger the diameter, the stronger the mechanical properties. The material appearance is good, but the force uniformity is poor.

[0072] Example 3

[0073] This embodiment discloses a method for manufacturing a special-shaped decorative engineering round bamboo, wherein the special-shaped decorative engineering round bamboo is a curved solid round bamboo component, and the round bamboo component is a concentric round bamboo component. The manufacturing method comprises:

[0074] S1, the fixed thickness bamboo plywood is first subjected to spray steaming treatment, and then bent and shaped according to the curvature requirements of the special-shaped decorative engineering round bamboo to be manufactured. Hot pressing to obtain a curved fixed thickness bamboo plywood;

[0075] The thickness of the fixed-thickness bamboo plywood is 5 mm; the bamboo plywood is a flat-pressed bamboo plywood;

[0076] The temperature of the steam spraying treatment is 200° C., and the treatment time is 10 minutes; during the steam spraying treatment, the steam spraying temperature of the bamboo green surface is 20° C. higher than that of the bamboo yellow surface.

[0077] The curvature of the shaping hot pressing is the same as the curvature of the special-shaped decorative engineering round bamboo to be manufactured. The pressure of the special-shaped hot pressing molding is 1.5MPa, the temperature is 130℃, and the insulation time is 40min; wherein the temperature of the fixed-thickness bamboo panels entering and exiting during the special-shaped hot pressing molding does not exceed 110℃.

[0078] S2. According to the structure of the special-shaped decorative engineering round bamboo to be manufactured, the special-shaped decorative engineering round bamboo is divided by horizontal multi-layer parallel sawing based on the thickness of the fixed-thickness bamboo piecing board, wherein the plane of the multi-layer parallel sawing is parallel to the plane where the bending center axis of the special-shaped decorative engineering round bamboo is located, and then vertical sawing is carried out to divide it into multiple round bamboo design units of smaller specifications for assembling the special-shaped decorative engineering round bamboo to be manufactured;

[0079] According to the width of each round bamboo design unit, the curved fixed-thickness bamboo panels are sawed to obtain a plurality of curved bamboo units, and then according to the two side structures of the round bamboo design unit, the two sides of the curved bamboo unit are selectively milled to obtain a plurality of special-shaped bamboo units, and the structures of the plurality of special-shaped bamboo units are similar to those of the plurality of round bamboo design units;

[0080] The sawing plane is perpendicular to the curved surface of the special-shaped decorative engineering round bamboo to be manufactured; during milling, the moisture content of the curved bamboo unit is 8%, and the milling speed is 2000 rpm.

[0081] S3, applying glue to each of the special-shaped bamboo units, and then assembling them in a mold according to the structure of the special-shaped decorative engineering round bamboo, hot pressing them after the assembly is completed to obtain the special-shaped decorative engineering round bamboo, and then cutting and polishing them to obtain qualified special-shaped decorative engineering round bamboo.

[0082] The pressure of hot pressing in S3 is 1.2MPa, the temperature is 130℃, and the insulation time is 40min. During hot pressing, the temperature of the blank of the special-shaped decorative engineering round bamboo does not exceed 110℃ when entering and exiting.

[0083] In this embodiment, the mold described in S3 is composed of a mold base and a mold cover, and a mold cavity with the same shape as the special-shaped decorative engineering round bamboo blank is opened on the mold. The mold cavity is composed of an upper mold cavity and a lower mold cavity. The upper mold cavity is arranged on the mold cover, and the lower mold cavity is arranged on the mold base. The circumferential angle of the lower mold cavity is 270°.

[0084] Fig.10 This is a real-object photo of the curved solid round bamboo of Example 3 of the present invention. From the cross section of the picture, it can be seen that many rectangular curved bamboo strips are spliced ​​together to form a curved solid round bamboo component, and the overall curved structure is compact.

[0085] In this embodiment, the performance index of the prepared single arc round bamboo component is as follows: using flat pressed bamboo plywood and side pressed bamboo plywood as raw materials, the concentric solid round bamboo component with an inner diameter of 80mm-100mm is manufactured, the product has good continuity of apparent bending lines, and a bulk density of 700-750kg / cm 3 According to the national standard GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Artificial Boards and Faced Artificial Boards - Formaldehyde Climate Chamber Test", the shear strength of the product's glue layer is tested to reach 5.9-6.3MPa, and the formaldehyde release is 1.1mg / L. According to the forestry industry standard "LY / T 2564-2015 Test Methods for Physical and Mechanical Properties of Round Bamboo", the product's radial load-bearing capacity is 5000-6500N, and the bending strength is 165-170MPa. The larger the diameter, the stronger the mechanical properties, the better the appearance of the material, but the uniformity of force is poor.

[0086] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for manufacturing special-shaped decorative engineering round bamboo, characterized in that: The special-shaped decorative engineering round bamboo is a curved solid or hollow round bamboo component, and the round bamboo component is a concentric round bamboo component or an eccentric round bamboo component; the manufacturing method comprises: S1. Taking the curvature of the special-shaped decorative engineering round bamboo to be manufactured as the standard, the fixed-thickness bamboo plywood after the spray steam treatment is required to be bent and shaped by hot pressing to obtain a curved fixed-thickness bamboo plywood; S2. According to the structure of the special-shaped decorative engineering round bamboo to be manufactured, the thickness of the curved fixed-thickness bamboo piecing board is used as a reference to split the special-shaped decorative engineering round bamboo by multi-layer parallel sawing, and multiple round bamboo design units for assembling the special-shaped decorative engineering round bamboo to be manufactured are designed; if the special-shaped decorative engineering round bamboo to be manufactured is a solid round bamboo component, after the multi-layer parallel sawing, it is necessary to saw again in the vertical direction to obtain multiple round bamboo design units of smaller specifications; According to the width of each round bamboo design unit, the curved fixed-thickness bamboo panels are sawed to obtain a plurality of curved bamboo units, and then according to the two side structures of the round bamboo design unit in the length direction, the two sides of the curved bamboo unit are selectively milled to obtain special-shaped bamboo units, and the special-shaped bamboo units have a structure similar to that of the round bamboo design unit; S3, applying glue to each of the special-shaped bamboo units, and after the glue is dry, assembling them in a mold according to the structure of the special-shaped decorative engineering round bamboo to be manufactured, wherein the mold has a mold cavity consistent with the appearance of the special-shaped decorative engineering round bamboo, and hot pressing is performed after the assembly is completed to obtain the special-shaped decorative engineering round bamboo.

2. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The bamboo panels described in S1 are flat-pressed bamboo panels and / or side-pressed bamboo panels, and the fixed-thickness bamboo panels are wide fixed-thickness bamboo panels.

3. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The temperature of the steaming treatment in S1 is 140-200° C., and the treatment time is 10-30 min. During the steaming treatment, the temperature of the bamboo green surface is 20° C. higher than that of the bamboo yellow surface.

4. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The bending and hot pressing molding described in S1 has a pressure of 1.2-1.5MPa, a temperature of 130-145°C, and a heat preservation time of 30-40min; and the temperature of the fixed-thickness bamboo panels entering and exiting during bending and hot pressing molding does not exceed 110°C.

5. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The sawing surface in S2 is carried out along the curved surface of the curved bamboo board of fixed thickness; when milling, the moisture content of the curved bamboo unit is 3-8%, and the milling speed is 2000 rpm.

6. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The pressure of hot pressing in S3 is 0.8-1.2MPa, the temperature is 130-145°C, and the insulation time is 30-40min. During hot pressing, the temperature of the blank of the special-shaped decorative engineering round bamboo does not exceed 110°C when entering and exiting.

7. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1, characterized in that: The curved hollow round bamboo component may be a hollow round bamboo component with a curved outer surface, a hollow round bamboo component with a curved inner surface, or a hollow round bamboo component that is curved as a whole.

8. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 1 or 2, characterized in that: The mold described in S3 consists of a mold base and a mold cover. The mold is provided with a mold cavity with the same shape as the special-shaped decorative engineering round bamboo blank. The mold cavity is arranged in a horizontal direction. The mold cavity consists of an upper mold cavity and a lower mold cavity. The upper mold cavity is arranged on the mold cover, and the lower mold cavity is arranged on the mold base. The circumferential angle of the lower mold cavity is 210°~270°.

9. The method for manufacturing special-shaped decorative engineering round bamboo according to claim 8, characterized in that: During the assembly in S3, when the special-shaped decorative engineering round bamboo is a hollow structure, a plurality of special-shaped bamboo units are assembled in the lower mold cavity from bottom to top along the horizontal direction to fit the inner wall of the lower mold cavity, and the assembly of the upper half of the blank is supported by a support hoop, the shape of the support hoop matches the cross-sectional shape of the vertical center axis of the special-shaped decorative engineering round bamboo to be manufactured.

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