A method of manufacturing a continuous wide bamboo winding strip with variable fiber angle and a bamboo winding product

Abstract

The present application relates to the technical field of materials, and particularly relates to a preparation method for manufacturing continuous wide bamboo winding strips with variable fiber angles and a bamboo winding product. The preparation method comprises the following steps: cutting fresh bamboo canes into arc-shaped bamboo pieces, and then performing softening treatment, removing green bamboo skin and pith, and flattening treatment to obtain bamboo flattened plates; string direction planing of the bamboo flattened plates to obtain thin bamboo pieces; drying the thin bamboo pieces, parallelly splicing the thin bamboo pieces in the width direction, and parallelly lengthening the thin bamboo pieces in the length direction to obtain a large-format rectangular thin bamboo piece mat; cutting the large-format rectangular thin bamboo piece mat into wide bamboo strips with a cutting angle of; and lengthening the wide bamboo strips into continuous long wide bamboo winding strips. The wide bamboo winding strips obtained by using the preparation method can be used to manufacture winding products with any angle of fiber orientation angle at any constant winding angle, so that the fiber orientation angle of the bamboo winding product is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to a preparation method for manufacturing a continuous wide bamboo winding strip with variable fiber angles and a bamboo winding product. BACKGROUND

[0002] Bamboo is a material with both flexibility and rigidity, which leads to the fact that bamboo cannot change the winding angle of the winding product as flexibly as traditional fibers. In the prior art, the invention patents with publication numbers CN105711161A and CN105729594A respectively design axial and annular bamboo lath curtains, and propose a method suitable for bamboo winding, that is, fixing the feeding port and winding through the rotation and reciprocating motion of the mandrel. However, due to the inherent rigidity of bamboo, only large winding angles or are currently available for continuous winding of bamboo, because the smaller the winding angle, the greater the mismatch between the winding product and the core mold, which makes the bamboo lath curtain easily slide off the core mold and increases the waste at both ends of the winding product. Therefore, in actual production, large winding angles are usually used for winding, which leads to the fact that only two fiber angles, longitudinal and annular, are available in the current bamboo winding products, limiting the optimization of the fiber orientation angle of the bamboo winding product.

[0003] Overall, compared with synthetic fiber winding, the development and application of bamboo winding products are still very limited, mainly due to the following reasons: first, the optimization of fiber orientation in the existing bamboo winding products is greatly limited; second, the types of bamboo winding units are limited, which restricts the diversified development of bamboo winding products. SUMMARY

[0004] The present application provides a preparation method for manufacturing a continuous wide bamboo winding strip with variable fiber angles and a bamboo winding product to solve the above technical problems existing in the prior art. The preparation method obtains a wide bamboo winding strip with a slitting angle for any fiber orientation angle by changing the included angle between the slitting direction and the fiber longitudinal direction. Using the wide bamboo winding strip for winding, a bamboo winding product with a fiber orientation angle of can be prepared at any constant winding angle, solving the problem of the inability to optimize the fiber orientation in the bamboo winding product.

[0005] According to a first aspect of the present application, the present application provides a preparation method for manufacturing a continuous wide bamboo winding strip with variable fiber angles, comprising the following steps:

[0006] Step S1, selecting a fresh bamboo cylinder, radially splitting it into an arc-shaped bamboo sheet, and obtaining a bamboo flat plate after softening treatment, removing the bamboo green and pith yellow treatment, and flattening treatment of the arc-shaped bamboo sheet;

[0007] Step S2, flattening the bamboo plate obtained in step S1 to obtain thin bamboo pieces by planing along the chord direction of the bamboo plate;

[0008] Step S3, drying the thin bamboo pieces obtained in step S2 to obtain a moisture content of less than 10%, and then parallelly splicing the thin bamboo pieces in the width direction of the thin bamboo pieces by using a gluing method, and parallelly lengthening the thin bamboo pieces in the length direction of the thin bamboo pieces by using a finger jointing method and a gluing reinforcing method, to obtain a large-format rectangular thin bamboo piece mat;

[0009] Step S4, cutting the large-format rectangular thin bamboo piece mat obtained in step S3 into wide bamboo strips, and obtaining a cutting angle by changing the included angle between the cutting direction and the fiber longitudinal direction;

[0010] Step S5, according to the cutting angle , the wide bamboo strips obtained in step S4 are classified and lengthened into continuous wide bamboo winding strips according to the lengthening mode of step S3.

[0011] The preparation method for manufacturing the continuous wide bamboo winding strips with variable fiber angles has the characteristics of systematization and strong operability, and by precisely controlling the process parameters of each step, the fiber orientation optimization problem in the bamboo winding product can be effectively solved, the mechanical properties of the product are improved, and a foundation is laid for the wide application of bamboo in the field of winding products.

[0012] Further, in step S4, the cutting angle is determined by the following formula (1) or (2):

[0013] (1);

[0014] (2);

[0015] In the formula, is the cutting angle, is the included angle between the cutting direction and the fiber longitudinal direction; is the winding angle; is the fiber orientation angle in the bamboo winding product. According to the winding angle and the target fiber orientation angle, the determination method of the cutting angle is determined, the precise matching of the fiber orientation angle and the cutting angle under different winding angles can be realized, so that the fiber orientation angle is precisely controlled, the fiber orientation angle of the bamboo winding product is optimized, and the requirements of diversified application scenarios on the performance of the product are met.

[0016] Further, in step S4, the cutting width of the wide bamboo strip can be determined by the following formula (3):

[0017]

[0018] (3); ​​

[0019] In the formula, is the slitting width of the wide bamboo strip; is the thickness of the wide bamboo strip; is the winding angle; is the mandrel radius; is the number of winding layers.

[0020] That is, formula (3) takes into account the thickness of the wide bamboo strip, the winding angle, the mandrel radius, and the number of winding layers, and specifies the basis for determining the slitting width of the wide bamboo strip. Such a determination method can ensure that there is no overlap or gap between adjacent winding spirals during winding, improving the quality and stability of the wound product, while reducing material waste, improving production efficiency and resource utilization.

[0021] Further, in step S3, the width and length of the large-format rectangular thin bamboo sheet are determined by the following formulas (4) and (5), respectively:

[0022] (4);

[0023] (5);

[0024] wherein, , ;

[0025] In the formula, and represent the width and length of the large-format rectangular thin bamboo sheet, respectively; and represent the width and length of the large-format rectangular thin bamboo sheet required to slit a wide bamboo strip with a slitting width of under a given slitting angle ; and represent the number of slittings in the width and length directions of the large-format rectangular thin bamboo sheet, respectively; is the single slitting allowance; is the remaining allowance after slitting.

[0026] Further refines the determination method of the width and length of the large-format rectangular thin bamboo sheet, i.e., formulas (4) and (5), which combines the parameters of slitting angle, slitting width, slitting frequency, and allowance. Using such a determination method can minimize the loss of raw materials during the slitting process, reduce production costs, while ensuring the dimensional accuracy of the bamboo strip, which is conducive to the smooth progress of the subsequent winding process and the improvement of product quality.

[0027] Further, in step S3, the method of splicing by gluing is as follows: after coating the side of the thin bamboo strip with urea-formaldehyde glue, the two thin bamboo strips are spliced ​​together, and the heating temperature is 140-170℃.

[0028] The adhesive splicing method includes applying urea-formaldehyde glue and heating within a specific temperature range. This method achieves a firm splicing of thin bamboo strips in the width direction, ensuring the flatness and integrity of the large-format rectangular thin bamboo strip mat. It provides high-quality raw materials for subsequent cutting and winding processes, which helps improve the performance and reliability of the final product.

[0029] Further, in step S3, the splicing method is as follows: first, use a knife to prepare finger joint teeth at the end of the thin bamboo strip for finger jointing, and then hot-press a hot melt adhesive film on one side of the finger-jointed thin bamboo strip, with the hot press plate temperature being 150-250℃.

[0030] In the above solution, the splicing method involves first finger-jointing followed by hot-pressing with hot melt adhesive film, and the temperature range of the hot-pressing plate is specified. This allows the thin bamboo strips to be firmly connected in the length direction, forming a continuous large-format rectangular thin bamboo strip mat, which enhances the overall strength and stability of the material, ensures the durability and reliability of the wrapping tape during use, and improves production efficiency.

[0031] Furthermore, in step S3, the drying process is performed using a flatbed dryer at a temperature of 80-100℃. Drying with a flatbed dryer effectively reduces the moisture content of the thin bamboo strips, ensuring they reach a suitable level of dryness and maintaining their flatness. This facilitates subsequent processes such as splicing, joining, and winding, improves bonding strength and product quality, prevents deformation and delamination caused by excessive moisture content, and guarantees the product's performance and lifespan.

[0032] Furthermore, in step S1, the fresh bamboo tubes are taken from 3-5 year old moso bamboo, the wall thickness of the bamboo tubes is >10mm, and the outer diameter is >120mm; the bamboo tubes are radially divided into 3-4 parts. By limiting the source, size, and number of divisions of the fresh bamboo tubes, the quality and consistency of the raw materials can be ensured. Selecting 3-5 year old moso bamboo and specifying its wall thickness and outer diameter can ensure that the mechanical properties and fiber characteristics of the bamboo meet the preparation requirements, providing a basic guarantee for the production of high-quality bamboo winding tape. At the same time, a reasonable number of divisions is beneficial to subsequent processing.

[0033] Furthermore, in step S1, the softening treatment is performed using high-temperature steam softening at a temperature of 150-200℃ for 5-10 minutes. High-temperature steam softening makes the curved bamboo strips soft and easy to process, facilitating subsequent removal of the bamboo green and pith, as well as flattening. This improves the material's workability and processing precision. Simultaneously, a suitable softening temperature and time prevent damage to the bamboo, ensuring its mechanical properties.

[0034] Furthermore, in step S2, the thickness of the thin bamboo strip is 0.2-0.6 mm, and the width is 60-100 mm. By limiting the thickness and width of the thin bamboo strip to a reasonable range, it is ensured that the thin bamboo strip has suitable size and flexibility, which facilitates subsequent processes such as widening, lengthening, and cutting. At the same time, it helps to control the performance and quality of the final bamboo winding tape, so that it meets the size and performance requirements of bamboo winding tape in different application scenarios.

[0035] According to a second aspect of the present invention, the present invention also provides a bamboo winding product, which is prepared from a wide bamboo winding strip prepared by the above-described preparation method.

[0036] In some specific embodiments, the bamboo-wound product is made by winding multiple layers of bamboo wrapping strips of different widths. The bamboo-wound product can be made by winding bamboo wrapping strips of any number of layers of different widths, such as 1 layer, 2 layers, 5 layers, 10 layers, 20 layers, 50 layers, 100 layers, etc. In some specific embodiments, the bamboo-wound product is made by winding 10 layers of bamboo wrapping strips of different widths.

[0037] Preferably, the winding angle of the bamboo winding product The range is 75°-90°.

[0038] Preferably, from the inside out, the cutting width of the wide bamboo strips used for different layers of wide bamboo wrapping gradually increases in increments of 0-3 mm. When the cutting angle... As the angle decreases from 90° to 0°, the fiber orientation angle... The temperature ranges from -15° to 0° to 75° to 90°, or from 165° to 180° to 75° to 90°.

[0039] The beneficial effects of this invention are:

[0040] The present invention provides a method for preparing continuous wide bamboo winding tape with variable fiber angles, which obtains the slitting angle by changing the angle between the slitting direction and the longitudinal direction of the fibers. for The wide bamboo strips enable the preparation of fibers with an orientation angle of [value missing] at any constant winding angle. This invention provides a solution to the problem of optimizing the fiber orientation angle in bamboo winding products, thus offering favorable conditions for the development and application of bamboo winding products. The preparation method of this invention has broad applicability and is expected to be extended to other winding units with a single fiber orientation. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is one of the wide bamboo strips with different cutting angles constructed in the embodiments of the present invention.

[0043] Figure 2 This is one of the wide bamboo strips with different cutting angles constructed in the embodiments of the present invention.

[0044] Figure 3 This is the third type of wide bamboo strip with different cutting angles constructed according to an embodiment of the present invention.

[0045] Figure 4 This is the fourth type of wide bamboo strips with different cutting angles constructed according to an embodiment of the present invention.

[0046] Figure 5 This is the fifth type of wide bamboo strip with different cutting angles constructed according to an embodiment of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] According to some specific embodiments of the present invention, the present invention provides a method for preparing a continuous wide bamboo winding tape with variable fiber angle, comprising the following steps:

[0049] Step S1: Select fresh bamboo tubes and radially split them into arc-shaped bamboo strips. Soften the arc-shaped bamboo strips, remove the bamboo green and pith, and flatten them to obtain bamboo flat sheets. Fresh bamboo tubes are taken from 3-5 year old moso bamboo, with a tube wall thickness >10mm and an outer diameter >120mm. The bamboo tubes are radially split into 3-4 parts. The softening treatment is high-temperature steam softening at a temperature of 150-200℃ for 5-10 minutes.

[0050] Step S2: Cut the bamboo flat plate obtained in step S1 into thin bamboo strips along the tangential direction; the thickness of the thin bamboo strips is 0.2-0.6mm and the width is 60-100mm.

[0051] Step S3: Dry the thin bamboo strips obtained in Step S2 until the moisture content is less than 10%. Then, use adhesive bonding to widen the strips in parallel along their width, and use finger jointing and adhesive bonding to lengthen them in parallel along their length to obtain a large-format rectangular thin bamboo mat. The drying process is performed using a flatbed dryer at 90℃. The adhesive bonding method involves applying urea-formaldehyde resin to the sides of the thin bamboo strips and then joining two strips together at a heating temperature of 140-170℃. The lengthening method involves first creating finger joints at the ends of the bamboo strips using a knife, then hot-pressing a hot-melt adhesive film onto one side of the finger-jointed bamboo strip at a temperature of 150-250℃.

[0052] The width and length of the large-format rectangular thin bamboo mat are determined by the following formulas (4) and (5):

[0053] (4);

[0054] (5);

[0055] in, , ;

[0056] In the formula, and These represent the width and length of a large-format rectangular thin bamboo mat, respectively. and These represent the values ​​at a given slitting angle. Below, a cutting width of [width value missing] is cut out. The width and length of the large rectangular thin bamboo strips required for the wide bamboo strips; and These represent the number of cuts in the width and length directions of a large-format rectangular thin bamboo mat, respectively; It is the remaining amount after a single cut; It is the remaining amount after the cutting is completed.

[0057] Step S4: Cut the large rectangular thin bamboo strips obtained in step S3 into wide bamboo strips. Different cutting angles are obtained by changing the angle between the cutting direction and the longitudinal direction of the fibers. Wide bamboo strips.

[0058] In step S4, the cutting angle is determined. Determined by the following formula (1) or (2):

[0059] (1);

[0060] (2);

[0061] In the formula, It is the cutting angle, which is the angle between the cutting direction and the longitudinal direction of the fiber. It is the winding angle; It is the fiber orientation angle in bamboo winding products.

[0062] In step S4, the cutting width of the wide bamboo strip can be determined by the following formula (3):

[0063] (3);

[0064] In the formula, It refers to the cutting width of the wide bamboo strip; It refers to the thickness of the wide bamboo strip; It is the winding angle; It is the core mold radius; It refers to the number of winding layers.

[0065] like Figure 1 The image shows a large rectangular thin bamboo mat before slicing and the mat after slicing at different angles. Wide strips of bamboo, cut into sections. (Example) Figure 2 The image shows a large rectangular thin bamboo mat before slicing and the mat after slicing at different angles. Wide strips of bamboo, cut into sections. (Example) Figure 3 The image shows a large rectangular thin bamboo mat before slicing and the mat after slicing at different angles. Wide strips of bamboo, cut into sections. (Example) Figure 4 The image shows a large rectangular thin bamboo mat before slicing and the mat after slicing at different angles. Wide strips of bamboo, cut into sections. (Example) Figure 5 The image shows a large rectangular thin bamboo mat before slicing and the mat after slicing at different angles. Wide strips of bamboo cut into strips.

[0066] Step S5: Based on the cutting angle The wide bamboo strips obtained in step S4 are sorted and joined together in the same way as in step S3 to form continuous wide bamboo winding strips.

[0067] Example 1

[0068] This embodiment provides a method for preparing a continuous wide bamboo winding tape with variable fiber angle, wherein the wide bamboo winding tape is used for winding angle... The first layer of the bamboo winding product is 80°, the target fiber orientation angle α is 20°, the radius r of the core mold used in the bamboo winding product is 75mm, and the thickness of the wide bamboo winding strip is 0.5mm.

[0069] The preparation method of this wide bamboo winding strip includes the following steps:

[0070] Step S1: Select fresh bamboo tubes and radially split them into arc-shaped bamboo strips. Soften the arc-shaped bamboo strips, remove the bamboo green and pith, and flatten them to obtain bamboo flat sheets. Fresh bamboo tubes are taken from 3-5 year old moso bamboo, with a tube wall thickness >10mm and an outer diameter >120mm. The bamboo tubes are radially split into 3-4 parts. The softening treatment is high-temperature steam softening at 180℃ for 6 minutes.

[0071] Step S2: Cut the bamboo flat plate obtained in step S1 into thin bamboo strips along the tangential direction; the thickness of the thin bamboo strips is 0.5 mm and the width is 100 mm.

[0072] Step S3: Dry the thin bamboo strips obtained in Step S2 until the moisture content is less than 10%. Then, use adhesive bonding to widen the strips in parallel along their width, and use finger jointing and adhesive bonding to lengthen them in parallel, obtaining a large-format rectangular thin bamboo mat. The drying process is performed using a flatbed dryer at 90℃. The adhesive bonding method involves applying urea-formaldehyde resin to the sides of the thin bamboo strips and then joining two strips together at 150℃. The lengthening method involves first creating finger joints at the ends of the bamboo strips using a knife, then hot-pressing a hot-melt adhesive film onto one side of the joined strips at 200℃.

[0073] The width and length of the large-format rectangular thin bamboo mat are determined by the following formulas (4) and (5):

[0074] (4);

[0075] (5);

[0076] in, , ;

[0077] In the formula, and These represent the width and length of a large-format rectangular thin bamboo mat, respectively. and These represent the values ​​at a given slitting angle. Below, a cutting width of [width value missing] is cut out. The width and length of the large rectangular thin bamboo strips required for the wide bamboo strips; and These represent the number of cuts in the width and length directions of a large-format rectangular thin bamboo mat, respectively; It is the remaining amount after a single cut; This refers to the remaining amount after the bamboo strips have been cut. The cutting width of the wide bamboo strips is also included. =82mm. Cutting angle. =164mm, =95mm, =17, =20, =3mm, =5mm, obtained =2680mm, =1870mm.

[0078] Step S4: Cut the large rectangular thin bamboo strips obtained in step S3 into wide bamboo strips. Different cutting angles are obtained by changing the angle between the cutting direction and the longitudinal direction of the fibers. Wide bamboo strips.

[0079] Step S5: Based on the cutting angle The wide bamboo strips obtained in step S4 are sorted and joined together in the same way as in step S3 to form continuous wide bamboo winding strips.

[0080] Example 2

[0081] This embodiment provides a bamboo-wound product, which is formed by winding multiple layers of wide bamboo winding tape onto a mandrel. The wide bamboo winding tape is prepared using the method of this invention, and the winding angle of the bamboo-wound product... The angle is 75°, the radius r of the mandrel used is 75mm, and the number of winding layers is... The thickness of each layer of wide bamboo wrapping tape is 0.5mm. The cutting width d of the wide bamboo tape used in each layer of wide bamboo wrapping tape and the cutting angle of the wide bamboo tape that matches the fiber orientation angle α of the bamboo wrapping product are also specified. As shown in Table 1 below.

[0082] Table 1

[0083]

[0084] As shown in Table 1, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is required to be wound on a mandrel with a radius of 75 mm, if the winding angle of the bamboo-wound product is 75°, the slitting width of the wide bamboo tape needs to increase from 123 mm to 130 mm as the number of winding layers increases from the 1st to the 10th layer. As the slitting angle β of the wide bamboo tape decreases from 90° to 0° in 10° increments, the fiber orientation angle α in the bamboo-wound product changes from 165° or -15° to 75° in 10° increments, achieving the desired fiber orientation angle. Any angle.

[0085] Example 3

[0086] This embodiment provides a bamboo-wound product, which is formed by winding multiple layers of wide bamboo winding tape onto a mandrel. The wide bamboo winding tape is prepared using the method of this invention, and the winding angle of the bamboo-wound product... The angle is 80°, the radius r of the mandrel used for fabrication is 75 mm, and the number of winding layers is... It is 10. The thickness of each layer of wide bamboo wrapping tape is 0.5mm. The cutting width d of the wide bamboo tape used in each layer of wide bamboo wrapping tape and the fiber orientation angle with the bamboo wrapping product are also specified. Matching wide bamboo strip cutting angle As shown in Table 2 below.

[0087] Table 2

[0088]

[0089] As shown in Table 2, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is required to be wound on a mandrel with a radius of 75 mm, if the winding angle of the bamboo-wound product is 80°, the slitting width of the wide bamboo tape needs to increase from 82 mm to 87 mm as the number of winding layers increases from the 1st to the 10th layer. As the slitting angle of the wide bamboo tape decreases from 90° to 0° in 10° increments, the fiber orientation angle in the bamboo-wound product changes from 170° or -10° to 80° in 10° increments, achieving the desired fiber orientation angle. Any angle.

[0090] Example 4

[0091] This embodiment provides a bamboo-wound product, which is formed by winding multiple layers of wide bamboo winding tape onto a mandrel. The wide bamboo winding tape is prepared using the method of this invention, and the winding angle of the bamboo-wound product... The angle is 85°, the radius r of the mandrel used for fabrication is 75 mm, and the number of winding layers is... The thickness of each layer of wide bamboo wrapping tape is 0.5mm. The cutting width d of the wide bamboo tape used in each layer of wide bamboo wrapping tape and the cutting angle of the wide bamboo tape that matches the fiber orientation angle α of the bamboo wrapping product are also specified. As shown in Table 3 below.

[0092] Table 3

[0093]

[0094] As shown in Table 3, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is required to be wound on a mandrel with a radius of 75 mm, if the winding angle of the bamboo-wound product is 85°, the slitting width of the wide bamboo tape needs to increase from 41 mm to 44 mm as the number of winding layers increases from the 1st to the 10th layer. As the slitting angle of the wide bamboo tape decreases from 90° to 0° in 10° increments, the fiber orientation angle in the bamboo-wound product changes from 175° or -5° to 85° in 10° increments, achieving the desired fiber orientation angle. Any angle.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a continuous wide bamboo winding tape with variable fiber angle, characterized in that, Includes the following steps: Step S1: Select fresh bamboo tubes, radially split them into arc-shaped bamboo strips, soften the arc-shaped bamboo strips, remove the bamboo green and pith yellow, and flatten them to obtain bamboo flat sheets. Step S2: Cut the bamboo flat plate obtained in step S1 into thin bamboo strips by tangential cutting; Step S3: Dry the thin bamboo strips obtained in step S2 so that the moisture content is less than 10%. Then, use glue to splice the strips in parallel along the width direction and use finger joint and glue to reinforce them in parallel along the length direction to obtain a large rectangular thin bamboo strip mat. Step S4: Cut the large rectangular thin bamboo strips obtained in step S3 into wide bamboo strips. The cutting angle is obtained by changing the angle between the cutting direction and the longitudinal direction of the fibers. for Wide bamboo strips; Step S5: Based on the cutting angle The wide bamboo strips obtained in step S4 are sorted and joined together in the same way as in step S3 to form continuous wide bamboo winding strips. In step S4, the cutting angle Determined by the following formula (1) or (2): （1）； （2）； In the formula, It is the cutting angle, which is the angle between the cutting direction and the longitudinal direction of the fiber. It is the winding angle; It is the fiber orientation angle in bamboo winding products; In step S4, the cutting width of the wide bamboo strip can be determined by the following formula (3): （3）； In the formula, It refers to the cutting width of the wide bamboo strip; It refers to the thickness of the wide bamboo strip; It is the winding angle; It is the core mold radius; It refers to the number of winding layers; In step S3, the width and length of the large-format rectangular thin bamboo mat are determined by the following formulas (4) and (5): ，（4）； ，（5）； in, , ; In the formula, and These represent the width and length of a large-format rectangular thin bamboo mat, respectively. and These represent the values ​​at a given slitting angle. Below, a cutting width of [width value missing] is cut out. The width and length of the large rectangular thin bamboo strips required for the wide bamboo strips; and These represent the number of cuts in the width and length directions of a large-format rectangular thin bamboo mat, respectively; It is the remaining amount after a single cut; It is the remaining amount after the cutting is completed.

2. The preparation method according to claim 1, characterized in that, In step S3, the glued splicing method is as follows: after applying urea-formaldehyde glue to the side of the thin bamboo strip, the two thin bamboo strips are spliced ​​together, and the heating temperature is 140-170℃. And / or, the splicing method is as follows: first, use a knife to prepare finger joint teeth at the end of the thin bamboo strip for finger jointing, and then hot-press a hot melt adhesive film on one side of the finger-jointed thin bamboo strip, with the hot press plate temperature being 150-250℃. And / or, the drying process is performed using a plate dryer at a temperature of 80-100℃.

3. The preparation method according to claim 1, characterized in that, In step S1, the fresh bamboo tube is taken from 3-5 year old moso bamboo, the wall thickness of the bamboo tube is >10mm, and the outer diameter is >120mm; the bamboo tube is radially divided into 3-4 parts; And / or, the softening treatment is high-temperature steam softening, with a softening temperature of 150-200℃ and a softening time of 5-10 minutes.

4. The preparation method according to claim 1, characterized in that, In step S2, the thickness of the thin bamboo strip is 0.2-0.6 mm and the width is 60-100 mm.

5. A bamboo-wrapped product, characterized in that, The wide bamboo winding tape is prepared by the preparation method described in any one of claims 1-4.

6. The bamboo winding product according to claim 5, characterized in that, Bamboo-wrapped products are made by wrapping multiple layers of bamboo wrapping strips of different widths.

7. The bamboo winding product according to claim 6, characterized in that, The winding angle of the bamboo-wrapped product The range is 75°-90°.

8. The bamboo-wound product according to claim 6, characterized in that, From the inside out, the cutting width of the wide bamboo strips used for different layers of wide bamboo wrapping gradually increases in increments of 0-3mm; when the cutting angle... From 90° to 0°, the fiber orientation angle The temperature ranges from -15° to 0° to 75° to 90°, or from 165° to 180° to 75° to 90°.

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