Preparation method for manufacturing continuous wide bamboo winding belt with variable fiber angle and bamboo winding product

Abstract

The invention relates to the technical field of materials, in particular to a preparation method for manufacturing a continuous wide bamboo winding belt with variable fiber angles and a bamboo winding product. The preparation method comprises the following steps: cutting a fresh bamboo tube into arc-shaped bamboo chips, and then carrying out softening treatment, bamboo green and marrow yellow removal treatment and flattening treatment to obtain a bamboo flattened plate; slicing the flattened bamboo plate in the chordwise direction to obtain thin bamboo chips; drying the thin bamboo chips, widening the thin bamboo chips in parallel in the width direction, and lengthening the thin bamboo chips in parallel in the length direction to obtain a large-breadth rectangular thin bamboo chip mat; the large-breadth rectangular thin bamboo sheet mat is cut into wide bamboo belts with the component cutting angle # imgabs 0 # being # imgabs 1 #; and the wide bamboo belts are lengthened to form the wide bamboo winding belts with continuous lengths. The wide bamboo winding belt obtained through the preparation method can be used for preparing a winding product with the fiber orientation angle of # imgabs2 at any constant winding angle, so that the fiber orientation angle of the bamboo winding product is optimized.

Description

Technical Field

[0001] The invention relates to the field of material technology, in particular to a preparation method for a continuous wide bamboo winding belt with variable fiber angle and a bamboo winding product. Background Art

[0002] Bamboo is a material that is both flexible and rigid, which means that the winding angle of bamboo products cannot be changed flexibly like traditional fibers. In the prior art, the invention patents with publication numbers CN105711161A and CN105729594A respectively designed two types of bamboo strip curtains, axial and circumferential, and proposed a method suitable for bamboo winding, that is, a fixed feed port and winding through the rotation and reciprocating motion of the core shaft. However, due to the inherent rigidity of bamboo, only large winding angles are currently available. or Used for continuous bamboo winding, the smaller the winding angle, the greater the mismatch between the wound product and the core mold, making it easy for the bamboo strip curtain to slip off the core mold and increasing waste at both ends of the wound product. Therefore, large winding angles are commonly used in actual production. As a result, the current bamboo winding products only have two fiber angles: longitudinal and circumferential, which limits the optimization of fiber orientation angles in bamboo winding products.

[0003] Overall, compared with synthetic fiber winding, the development and application of bamboo winding products are still very limited. The main reasons are: first, the optimization of fiber orientation in existing bamboo winding products is greatly restricted; second, the types of bamboo winding units are limited, which restricts the diversified development of bamboo winding products. Summary of the Invention

[0004] The present invention provides a method for manufacturing a continuous wide bamboo winding tape with variable fiber angle and a bamboo winding product to solve the above technical problems existing in the prior art. The preparation method obtains a slitting angle by changing the angle between the slitting direction and the longitudinal direction of the fiber. for Wide bamboo winding tape. By using this wide bamboo winding tape, fibers with a fiber orientation angle of The bamboo wrapped products solve the problem that the fiber orientation in bamboo wrapped products cannot be optimized.

[0005] According to a first aspect of the present invention, the present invention provides a method for manufacturing a continuous wide bamboo wrapping tape with a variable fiber angle, comprising the following steps: Step S1: selecting a fresh bamboo tube, radially dividing it into arc-shaped bamboo slices, softening the arc-shaped bamboo slices, removing the bamboo green and yellow pith, and flattening them to obtain a bamboo flat plate; Step S2, slicing the bamboo flat plate obtained in step S1 in the tangential direction to obtain thin bamboo slices; Step S3, drying the thin bamboo sheets obtained in step S2 to reduce the moisture content to less than 10%, then gluing the thin bamboo sheets in parallel along the width direction, and lengthening the thin bamboo sheets in parallel along the length direction by finger-joining and gluing, to obtain a large rectangular thin bamboo sheet mat; Step S4: Cut the large rectangular thin bamboo mat obtained in step S3 into wide bamboo strips, and obtain the cutting angle by changing the angle between the cutting direction and the longitudinal direction of the fiber. for wide bamboo belts; Step S5: According to the cutting angle The wide bamboo strips obtained in step S4 are classified and spliced into continuous wide bamboo wrapping strips according to the splicing method of step S3.

[0006] The present invention provides a preparation method for a continuous wide bamboo winding belt with variable fiber angle, which is systematic and highly operable. By precisely controlling the process parameters of each step, it can effectively solve the problem of optimizing the fiber orientation in bamboo winding products, improve the mechanical properties of the products, and lay the foundation for the widespread application of bamboo in the field of winding products.

[0007] Furthermore, in step S4, the cutting angle Determine by the following formula (1) or (2): (1); (2); In the formula, is the slitting angle, which is the angle between the slitting direction and the longitudinal direction of the fiber; is the winding angle; It is the fiber orientation angle in bamboo winding products.

[0008] The method for determining the slitting angle is clarified based on the winding angle and the target fiber orientation angle, which can achieve precise matching of the fiber orientation angle and the slitting angle at different winding angles, thereby accurately controlling the fiber orientation angle and optimizing the fiber orientation angle of bamboo-wrapped products to meet the performance requirements of products in diverse application scenarios.

[0009] Furthermore, in step S4, the slitting width of the wide bamboo strip can be determined by the following formula (3): (3); In the formula, is the slitting width of wide bamboo strips; is the thickness of the wide bamboo strip; is the winding angle; is the core mold radius; is the number of winding layers.

[0010] Formula (3) takes into account factors such as the thickness of the wide bamboo strip, the winding angle, the core mold radius, and the number of winding layers, and provides a basis for determining the slitting width of the wide bamboo strip. This determination method ensures that there is neither overlap nor separation between adjacent winding spirals during the winding process, improving the quality and stability of the wound product, while reducing material waste and improving production efficiency and resource utilization.

[0011] Furthermore, in step S3, the width and length of the large rectangular thin bamboo mat are determined by the following formulas (4) and (5), respectively: , (4); , (5); in, , ; In the formula, and Respectively represent the width and length of a large rectangular thin bamboo mat; and Respectively represent the given cutting angle Next, cut out a slitting width of The width and length of the large rectangular thin bamboo mat required for the wide bamboo strips; and Respectively represent the number of cuts in the width and length directions of a large rectangular thin bamboo mat; It is the single cutting allowance; It is the remaining amount after cutting is completed.

[0012] The method for determining the width and length of large rectangular thin bamboo mats was further refined, namely formulas (4) and (5), which combined parameters such as slitting angle, slitting width, number of slitting times, and margin. This determination method can minimize the loss of raw materials during the slitting process, reduce production costs, and ensure the dimensional accuracy of the bamboo strips, which is conducive to the smooth progress of the subsequent winding process and the improvement of product quality.

[0013] Furthermore, in step S3, the widening method of the adhesive bonding method is: after coating urea-formaldehyde adhesive on the side edges of the thin bamboo sheets, the two thin bamboo sheets are widened and the heating temperature is 140-170°C.

[0014] The gluing method includes coating urea-formaldehyde glue and heating to a certain temperature range, which realizes the firm splicing of the thin bamboo sheets in the width direction, ensures the flatness and integrity of the large-format rectangular thin bamboo sheet mat, provides high-quality raw materials for subsequent slitting and winding processes, and helps to improve the performance and reliability of the final product.

[0015] Furthermore, in step S3, the method of extending is: first, finger-joining teeth are prepared at the ends of the thin bamboo pieces using a tool for finger-joining, and then a hot-melt adhesive film is hot-pressed on one side of the finger-joined thin bamboo pieces, with the temperature of the hot-pressing plate being 150-250°C.

[0016] In the above scheme, the method of splicing is to first finger-join and then hot-press the hot-melt adhesive film, and the temperature range of the hot pressing plate is given. This can make the thin bamboo strips firmly connected in the length direction to form a continuous large-scale rectangular thin bamboo mat, enhance the overall strength and stability of the material, ensure the durability and reliability of the wrapping tape during use, and improve production efficiency.

[0017] Furthermore, in step S3, the drying process is performed using a flat plate dryer at a drying temperature of 80-100°C. Drying in a flat plate dryer effectively reduces the moisture content of the bamboo veneers, achieving an appropriate dryness level and ensuring the smoothness of the veneers. This facilitates subsequent processes such as splicing, lengthening, and winding, improves bonding strength and product quality, prevents deformation and debonding of the product caused by excessive moisture content, and ensures product performance and service life.

[0018] Furthermore, in step S1, the fresh bamboo tube is taken from a 3-5 year old moso bamboo, the bamboo tube has a wall thickness greater than 10 mm and an outer diameter greater than 120 mm, and the bamboo tube is radially split into 3-4 portions. By specifying the source, size, and number of portions of the fresh bamboo tube, 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 ensures that the mechanical properties and fiber characteristics of the bamboo meet preparation requirements, providing a foundation for producing high-quality bamboo wrapping tape. Furthermore, a reasonable number of portions facilitates subsequent processing.

[0019] Furthermore, in step S1, the softening treatment is performed using high-temperature steam softening at a softening temperature of 150-200°C for a softening time of 5-10 minutes. High-temperature steam softening softens the curved bamboo strips, making them softer and easier to process, facilitating subsequent removal of the bamboo green and pith yellow, as well as flattening. This improves the material's workability and processing accuracy. Furthermore, a reasonable softening temperature and time can avoid damage to the bamboo material and ensure its mechanical properties.

[0020] Furthermore, in step S2, the bamboo sheets have a thickness of 0.2-0.6 mm and a width of 60-100 mm. By limiting the thickness and width of the bamboo sheets to a reasonable range, the sheets can be ensured to have appropriate size and flexibility, facilitating handling in subsequent processes such as widening, lengthening, and slitting. This also helps control the performance and quality of the final bamboo wrapping tape, ensuring that it meets the size and performance requirements of the bamboo wrapping tape in different application scenarios.

[0021] According to a second aspect of the present invention, the present invention further provides a bamboo winding product, which is prepared using the wide bamboo winding tape prepared by the above-mentioned preparation method.

[0022] In some specific embodiments, the wrapped bamboo product is formed by wrapping multiple layers of bamboo wrapping tapes of different widths. The wrapped bamboo product can be formed by wrapping any number of layers of bamboo wrapping tapes 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 wrapped bamboo product is formed by wrapping 10 layers of bamboo wrapping tapes of different widths.

[0023] Preferably, the winding angle of the bamboo winding product is It is 75°-90°.

[0024] Preferably, from inside to outside, the slitting width of the wide bamboo tape used for the different layers of wide bamboo wrapping tape increases gradually in increments of 0-3 mm. From 90° to 0°, the fiber orientation angle Changes from -15°~0° to 75°~90° or from 165°~180° to 75°~90°.

[0025] Beneficial effects of the present invention: The present invention provides a method for preparing a continuous wide bamboo winding tape with variable fiber angle, which obtains a slitting angle by changing the angle between the slitting direction and the longitudinal direction of the fiber. for The wide bamboo tape can produce a fiber orientation angle of The invention solves the problem of bamboo-wrapped products being unable to optimize fiber orientation angles, providing favorable conditions for the development and application of bamboo-wrapped products. The preparation method of the invention has wide applicability and is expected to be expanded to other winding units with a single fiber orientation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 One of the wide bamboo strips with different slitting angles constructed in an embodiment of the present invention.

[0028] Figure 2 This is the second wide bamboo strip with different cutting angles constructed in an embodiment of the present invention.

[0029] Figure 3 This is the third wide bamboo strip with different cutting angles constructed in an embodiment of the present invention.

[0030] Figure 4 This is the fourth wide bamboo strip with different cutting angles constructed in an embodiment of the present invention.

[0031] Figure 5 This is the fifth wide bamboo strip with different cutting angles constructed in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] According to some specific embodiments of the present invention, the present invention provides a method for manufacturing a continuous wide bamboo winding tape with a variable fiber angle, comprising the following steps: Step S1: Select a fresh bamboo tube, radially split it into arc-shaped bamboo slices, soften the arc-shaped bamboo slices, remove the bamboo green and yellow medullary, and flatten them to obtain a bamboo flat plate; the fresh bamboo tube is taken from a 3-5 year old moso bamboo, the bamboo tube wall thickness is greater than 10 mm, and the outer diameter is greater than 120 mm; the bamboo tube is radially split into 3-4 pieces; the softening method is high-temperature steam softening, the softening temperature is 150-200° C., and the softening time is 5-10 minutes.

[0034] Step S2: Slice the bamboo flat plate obtained in step S1 in the tangential direction to obtain thin bamboo slices; the thin bamboo slices have a thickness of 0.2-0.6 mm and a width of 60-100 mm.

[0035] Step S3: Dry the thin bamboo strips obtained in step S2 to a moisture content of less than 10%. The strips are then joined together in parallel widthwise directions using adhesive bonding, and lengthwise lengthwise using finger-joining and adhesive reinforcement, to produce a large rectangular thin bamboo mat. Drying is performed in a flatbed dryer at a temperature of 90°C. The widening method for adhesive bonding involves applying urea-formaldehyde adhesive to the sides of the strips and then joining the strips together at a heating temperature of 140-170°C. The lengthening method involves first using a tool to create finger-joining teeth on the ends of the strips for finger-joining. A hot-melt adhesive film is then applied to one side of the finger-joined strips at a temperature of 150-250°C.

[0036] The width and length of a large rectangular thin bamboo mat are determined by the following formulas (4) and (5), respectively: , (4); , (5); in, , ; In the formula, and Respectively represent the width and length of a large rectangular thin bamboo mat; and Respectively represent the given cutting angle Next, cut out a slitting width of The width and length of the large rectangular thin bamboo mat required for the wide bamboo strips; and Respectively represent the number of cuts in the width and length directions of a large rectangular thin bamboo mat; It is the single cutting allowance; It is the remaining amount after cutting is completed.

[0037] Step S4: Cut the large rectangular thin bamboo mat obtained in step S3 into wide bamboo strips, and obtain different cutting angles by changing the angle between the cutting direction and the longitudinal direction of the fiber. Wide bamboo belt.

[0038] In step S4, the cutting angle Determine by the following formula (1) or (2): (1); (2); In the formula, is the slitting angle, which is the angle between the slitting direction and the longitudinal direction of the fiber; is the winding angle; It is the fiber orientation angle in bamboo winding products.

[0039] In step S4, the slitting width of the wide bamboo strip can be determined by the following formula (3): (3); In the formula, is the slitting width of wide bamboo strips; is the thickness of the wide bamboo strip; is the winding angle; is the core mold radius; is the number of winding layers.

[0040] like Figure 1 Shown is a large rectangular thin bamboo mat before slitting and the one cut at the slitting angle. Slit into wide bamboo strips. Figure 2Shown is a large rectangular thin bamboo mat before slitting and the one cut at the slitting angle. Slit into wide bamboo strips. Figure 3 Shown is a large rectangular thin bamboo mat before slitting and the one cut at the slitting angle. Slit into wide bamboo strips. Figure 4 Shown is a large rectangular thin bamboo mat before slitting and the one cut at the slitting angle. Slit into wide bamboo strips. Figure 5 Shown is a large rectangular thin bamboo mat before slitting and the one cut at the slitting angle. Cut into wide bamboo strips.

[0041] Step S5: According to the cutting angle The wide bamboo strips obtained in step S4 are classified and spliced into continuous wide bamboo wrapping strips according to the splicing method of step S3.

[0042] Example 1 This embodiment provides a method for producing a continuous wide bamboo winding belt with variable fiber angle, wherein the wide bamboo winding belt is used for winding angle The first layer of the bamboo wrapped product with an angle of 80°, the target fiber orientation angle α is 20°, the radius r of the core mold used in the bamboo wrapped product is 75 mm, and the thickness of the wide bamboo wrapping tape is 0.5 mm.

[0043] The preparation method of the wide bamboo winding belt comprises the following steps: Step S1: Select a fresh bamboo tube, radially split it into arc-shaped bamboo slices, soften the arc-shaped bamboo slices, remove the bamboo green and yellow medullary, and flatten them to obtain a bamboo flat plate; the fresh bamboo tube is taken from a 3-5 year old moso bamboo, the bamboo tube wall thickness is greater than 10 mm, and the outer diameter is greater than 120 mm; the bamboo tube is radially split into 3-4 parts; the softening method is high-temperature steam softening, the softening temperature is 180° C., and the softening time is 6 minutes.

[0044] Step S2: Slice the bamboo flat plate obtained in step S1 in the tangential direction to obtain thin bamboo slices; the thin bamboo slices have a thickness of 0.5 mm and a width of 100 mm.

[0045] Step S3: Dry the bamboo sheets obtained in Step S2 to a moisture content of less than 10%. The sheets are then joined together in parallel widthwise directions using adhesive bonding, and lengthwise lengthwise using finger-joining and adhesive reinforcement, to produce a large rectangular bamboo sheet mat. Drying is performed in a flatbed dryer at a temperature of 90°C. The widening bonding method involves applying urea-formaldehyde adhesive to the sides of the bamboo sheets, then joining the two sheets together at a heating temperature of 150°C. The lengthening method involves first using a tool to create finger-joining teeth on the ends of the bamboo sheets for finger-joining. Then, a hot-melt adhesive film is applied to one side of the finger-joined bamboo sheets using a hot-pressing plate at a temperature of 200°C.

[0046] The width and length of a large rectangular thin bamboo mat are determined by the following formulas (4) and (5), respectively: , (4); , (5); in, , ; In the formula, and Respectively represent the width and length of a large rectangular thin bamboo mat; and Respectively represent the given cutting angle Next, cut out a slitting width of The width and length of the large rectangular thin bamboo mat required for the wide bamboo strips; and Respectively represent the number of cuts in the width and length directions of a large rectangular thin bamboo mat; It is the single cutting allowance; It is the remaining margin after slitting. =82mm. Cutting angle =164mm, =95mm, =17, =20, =3mm, =5mm, we get =2680mm, =1870mm.

[0047] Step S4: Cut the large rectangular thin bamboo mat obtained in step S3 into wide bamboo strips, and obtain different cutting angles by changing the angle between the cutting direction and the longitudinal direction of the fiber. Wide bamboo belt.

[0048] Step S5: According to the cutting angle The wide bamboo strips obtained in step S4 are classified and spliced into continuous wide bamboo wrapping strips according to the splicing method of step S3.

[0049] Example 2 This embodiment provides a bamboo wrapped product, which is formed by winding multiple layers of wide bamboo wrapped tape on a core mold. The wide bamboo wrapped tape is prepared by the preparation method of the present invention, and the winding angle of the bamboo wrapped product is The angle is 75°, the radius r of the core mold is 75mm, and the number of winding layers is The thickness of each layer of wide bamboo wrapping tape is 0.5 mm, the slitting width d of each layer of wide bamboo wrapping tape and the slitting angle of the wide bamboo tape are matched with the fiber orientation angle α of the bamboo wrapping product. As shown in Table 1 below.

[0050] Table 1

[0051] As can be seen from Table 1, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is required to be wound on a core mold with a radius of 75 mm, if the winding angle of the bamboo wrapped product is 75°, as the number of winding layers increases from the 1st layer to the 10th layer, the slitting width of the wide bamboo tape needs to increase from 123 mm to 130 mm. As the slitting angle β of the wide bamboo tape decreases from 90° to 0° at intervals of 10°, the fiber orientation angle α in the bamboo wrapped product changes from 165° or -15° to 75° at intervals of 10°, and the fiber orientation angle can be achieved. any angle of .

[0052] Example 3 This embodiment provides a bamboo wrapped product, which is formed by winding multiple layers of wide bamboo wrapped tape on a core mold. The wide bamboo wrapped tape is prepared by the preparation method of the present invention, and the winding angle of the bamboo wrapped product is The radius r of the core mold used in the preparation is 75 mm, and the number of winding layers is The thickness of each layer of wide bamboo wrapping tape is 0.5 mm, the slitting width d of the wide bamboo tape used in each layer of wide bamboo wrapping tape and the fiber orientation angle of the bamboo wrapping product are Matching the slitting angle of wide bamboo strips As shown in Table 2 below.

[0053] Table 2

[0054] As can be seen from Table 2, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is required to be wound on a core mold with a radius of 75 mm, if the winding angle of the bamboo wrapped product is 80°, as the number of winding layers increases from the 1st layer to the 10th layer, the slitting width of the wide bamboo tape needs to increase from 82 mm to 87 mm. As the slitting angle of the wide bamboo tape decreases from 90° to 0° at intervals of 10°, the fiber orientation angle in the bamboo wrapped product changes from 170° or -10° to 80° at intervals of 10°. The fiber orientation angle can be achieved. any angle of .

[0055] Example 4 This embodiment provides a bamboo wrapped product, which is formed by winding multiple layers of wide bamboo wrapped tape on a core mold. The wide bamboo wrapped tape is prepared by the preparation method of the present invention, and the winding angle of the bamboo wrapped product is The radius of the core mold used in the preparation is 75 mm, and the number of winding layers is The thickness of each layer of wide bamboo wrapping tape is 0.5 mm, the slitting width d of each layer of wide bamboo wrapping tape and the slitting angle of the wide bamboo tape are matched with the fiber orientation angle α of the bamboo wrapping product. As shown in Table 3 below.

[0056] Table 3

[0057] As can be seen from Table 3, when a continuous wide bamboo wrapping tape with a thickness of 0.5 mm is used for wrapping on a core mold with a radius of 75 mm, if the wrapping angle of the bamboo wrapping product is 85°, as the number of wrapping layers increases from the 1st layer to the 10th layer, the slitting width of the wide bamboo tape needs to increase from 41 mm to 44 mm. As the slitting angle of the wide bamboo tape decreases from 90° to 0° at intervals of 10°, the fiber orientation angle in the bamboo wrapping product changes from 175° or -5° to 85° at intervals of 10°. The fiber orientation angle can be achieved. any angle of .

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for producing a continuous wide bamboo winding tape with variable fiber angle, characterized in that: The steps include: Step S1: selecting a fresh bamboo tube, radially dividing it into arc-shaped bamboo slices, softening the arc-shaped bamboo slices, removing bamboo green and yellow marrow, and flattening them to obtain a bamboo flat plate; Step S2, slicing the bamboo flat plate obtained in step S1 in the tangential direction to obtain thin bamboo slices; Step S3, drying the thin bamboo sheets obtained in step S2 to reduce the moisture content to less than 10%, then gluing the thin bamboo sheets in parallel along the width direction, and lengthening the thin bamboo sheets in parallel along the length direction by finger-joining and gluing, to obtain a large rectangular thin bamboo sheet mat; Step S4: Cut the large rectangular thin bamboo mat obtained in step S3 into wide bamboo strips, and obtain the cutting angle by changing the angle between the cutting direction and the longitudinal direction of the fiber. for wide bamboo belts; Step S5: According to the cutting angle The wide bamboo strips obtained in step S4 are classified and spliced into continuous wide bamboo wrapping strips according to the splicing method of step S3.

2. The preparation method according to claim 1, characterized in that In step S4, the cutting angle Determine by the following formula (1) or (2): （1）； （2）； In the formula, is the slitting angle, which is the angle between the slitting direction and the longitudinal direction of the fiber; is the winding angle; It is the fiber orientation angle in bamboo winding products.

3. The preparation method according to claim 1, characterized in that In step S4, the slitting width of the wide bamboo strip can be determined by the following formula (3): （3）； In the formula, is the slitting width of wide bamboo strips; is the thickness of the wide bamboo strip; is the winding angle; is the core mold radius; is the number of winding layers.

4. The preparation method according to claim 3, characterized in that In step S3, the width and length of the large rectangular thin bamboo mat are determined by the following formulas (4) and (5), respectively: ，（4）； ，（5）； in, , ; In the formula, and Respectively represent the width and length of a large rectangular thin bamboo mat; and Respectively represent the given cutting angle Next, cut out a slitting width of The width and length of the large rectangular thin bamboo mat required for the wide bamboo strips; and Respectively represent the number of cuts in the width and length directions of a large rectangular thin bamboo mat; It is the single cutting allowance; It is the remaining amount after cutting is completed.

5. The preparation method according to claim 1, characterized in that In step S3, the widening method of the adhesive bonding method is as follows: urea-formaldehyde adhesive is applied to the sides of the thin bamboo sheets and then the two thin bamboo sheets are widened, and the heating temperature is 140-170° C.; And / or, the method of extending the length is: first, using a cutter to prepare finger-joining teeth on the ends of the thin bamboo pieces for finger-joining, and then hot-pressing a hot-melt adhesive film on one side of the finger-joined thin bamboo pieces, with the temperature of the hot-pressing plate being 150-250° C.; And / or, the drying treatment is carried out by using a flat plate dryer at a drying temperature of 80-100°C.

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

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

8. A bamboo wrapped product, characterized in that: The wide bamboo winding belt is prepared by the preparation method according to any one of claims 1 to 7.

9. The bamboo wrapped product according to claim 8, characterized in that: The bamboo wrapped product is made of multiple layers of bamboo wrapped tapes of different widths; preferably, the winding angle of the bamboo wrapped product is It is 75°-90°.

10. The bamboo wrapped product according to claim 9, characterized in that: From the inside to the outside, the slitting width of the wide bamboo tape used for different layers of wide bamboo wrapping tape gradually increases in increments of 0-3mm; when the slitting angle From 90° to 0°, the fiber orientation angle Changes from -15°~0° to 75°~90° or from 165°~180° to 75°~90°.

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