Process for the production of a radial fiber reinforced bamboo filament wound pipe

Abstract

The present application belongs to the technical field of bamboo winding pipe production, and in particular to a bamboo winding pipe production process with radial fiber reinforced bars, which comprises the following detailed steps: bamboo pretreatment and processing step: select raw bamboo, remove knots and impurities, and process the raw bamboo into uniform bamboo strips with a width of 3-5 mm and a thickness of 0.8-1.2 mm by mechanical cutting or manual splitting; then, basalt fiber ropes are used as weaving materials, and the bamboo strips are tightly woven into bamboo canes with a width of 10-20 cm by double-lock plain weave technology; the present application introduces high-strength fiber axial "main bars", which greatly improves the axial bearing capacity of the pipeline, easily meeting the requirements of high ring stiffness and complex load. This innovative structure breaks through the performance bottleneck of traditional bamboo winding pipes due to the upper limit of the mechanical properties of bamboo, significantly improves the overall mechanical properties of the pipeline, and widens the application range of bamboo winding pipes in high-end engineering fields such as high pressure and large diameter.

Description

Technical Field

[0001] This invention relates to the field of bamboo winding pipe production technology, and in particular to a bamboo winding pipe production process with radial fiber reinforcement. Background Technology

[0002] Bamboo-wound composite material technology, as a green and sustainable engineering solution, has been widely used in the pipeline field. Traditional bamboo-wound pipe production processes primarily use bamboo strips wound in a staggered circumferential and radial pattern as a reinforcing skeleton, utilizing the longitudinal fiber characteristics of bamboo to provide both circumferential and axial strength. However, with the increasing demands for pipeline performance in engineering fields, traditional processes are gradually revealing their inherent limitations, specifically in the following aspects: Bamboo's mechanical properties have limitations, particularly its relatively low axial tensile strength. When pipe specifications increase or design requirements rise (such as achieving high ring stiffness above 30 kN / m²), traditional structures often require a significant increase in wall thickness to meet these requirements. This not only leads to a substantial increase in material consumption and costs but also makes the pipe bulky, failing to meet the demands of modern engineering for lightweight and high-strength materials. Therefore, how to overcome the limitations of bamboo's inherent mechanical properties while maintaining the environmental advantages of bamboo winding technology has become a pressing technical challenge for the industry.

[0003] The preparation of radial (longitudinal) bamboo strips requires high-quality bamboo and involves significant losses during processing, resulting in higher costs compared to circumferential bamboo strips. Furthermore, traditional bidirectional winding processes demand stringent equipment precision and operational requirements, hindering improvements in production efficiency. In addition, because traditional structures completely bind load-bearing capacity and matrix function to the bamboo, the potential for performance optimization through material combinations is limited. To address extreme loads in specific directions (especially the axial direction), it is difficult to flexibly introduce higher-performance reinforcing materials, leading to insufficient design flexibility. Therefore, how to optimize material cost structure, improve production efficiency, and enhance design flexibility while ensuring pipe performance is another significant technical challenge facing the industry.

[0004] Traditional bamboo-wound pipes have a rigid structural design, with load-bearing capacity and matrix function entirely dependent on the bamboo material. This makes them unsuitable for complex loads and high ring stiffness requirements in various application scenarios. For example, in projects requiring high axial tensile forces, traditional structures often fail to meet the requirements, necessitating increased wall thickness or the use of other high-cost materials. This not only increases engineering costs but also limits the wider application of bamboo-wound pipes. Therefore, developing a new composite pipe structure with greater design freedom and load-bearing efficiency to meet diverse engineering needs is a pressing technical challenge for the industry. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a manufacturing process for bamboo winding tubes with radial fiber reinforcement, which more precisely solves the problems mentioned in the background art.

[0006] This invention is achieved through the following technical solution: This invention proposes a production process for bamboo-wound tubes with radial fiber reinforcement, comprising the following detailed steps: Raw bamboo pretreatment and processing: Selecting raw bamboo, removing knots and impurities, and processing the raw bamboo into uniform bamboo strips with a width of 3mm to 5mm and a thickness of 0.8mm to 1.2mm by mechanical cutting or manual splitting; subsequently, using basalt fiber rope as the weaving material, the bamboo strips are tightly woven into bamboo strips with a width of 10cm to 20cm using a double-lock plain weave weaving technique, serving as a reserve material for subsequent circumferential winding; Inner lining preparation and laying: Selecting impregnated... Epoxy-resin-coated fiberglass felt is used as the inner lining material. It is evenly and tightly wound onto the surface of a pre-prepared mold using a winding machine to form the inner lining of the pipe. The inner lining is made smooth and free of air bubbles to provide good inner wall support and impermeability. The first winding step of the circumferential bamboo strip layer is as follows: the pre-treated bamboo strips are impregnated in phenolic resin. After ensuring full penetration, they are wound circumferentially onto the mold by mechanical or manual means to form the initial circumferential bamboo strip layer. The thickness of this layer is set to 60mm to 100mm according to the pipe design requirements, focusing on providing circumferential pressure resistance and forming the pipe base.

[0007] Preferably, the method also includes an axial reinforcement layer laying step: laying a longitudinal main "main reinforcement layer", in which high-performance fiber strips impregnated with phenolic resin are evenly laid longitudinally onto the already wound circumferential bamboo strip layer as the core "ribs" to provide axial tensile strength and circumferential bending strength. The laying thickness is precisely calculated and adjusted to 1mm to 5mm according to the mechanical performance requirements of the pipeline.

[0008] Preferably, when laying the high-performance fiber strips of the axial reinforcement layer, the fiber direction is ensured to be consistent with the axial direction of the pipe, and there is no overlap or gap between the strips, so as to maximize the axial reinforcement effect.

[0009] Preferably, the process also includes an overall binding reinforcement step: after the axial reinforcement layer is laid, basalt fiber cloth or other high-performance fiber cloth impregnated with phenolic resin is used to wrap the laid layers in a circumferential manner, and the layers are bound mechanically or manually to enhance the integrity and shear resistance of the pipeline. The thickness of the binding layer is 0.5 mm to 2 mm.

[0010] Preferably, the method further includes a secondary circumferential bamboo strip winding step: after the overall binding and reinforcement step, the bamboo strips impregnated with phenolic resin are wound circumferentially onto the mold again to form a second circumferential bamboo strip layer. The thickness of this layer is set to 40mm to 60mm according to the pipe design requirements to further enhance the circumferential strength and stability of the pipe.

[0011] Preferably, the process also includes an outer surface protective layer coating step: a layer of polyurethane resin or other high-performance waterproof and anti-corrosion material is evenly coated on the outer surface of the wound bamboo pipe to form a waterproof and anti-corrosion protective layer. The coating thickness is set to 0.2mm to 1mm according to the usage environment and requirements to ensure the durability of the pipe for long-term use.

[0012] The layered manufacturing method for bamboo winding tube production is characterized by the fact that each step is independent yet closely coordinated through precise mechanical control or strict manual operation specifications, ensuring a high degree of controllability of the production process and stability of product quality, while also facilitating the construction and upgrading of automated or semi-automated production lines.

[0013] Preferably, the fiber type, number of layers or laying thickness of the axial reinforcement layer, as well as the number and thickness of the circumferential bamboo strip layer, can be flexibly adjusted and replaced according to specific engineering needs and pipeline usage conditions, so as to customize the mechanical properties of the pipeline and meet the requirements of complex loads and high ring stiffness in different application scenarios.

[0014] Preferably, inexpensive circumferential bamboo strips are used as the main structural material, combined with a small amount of high-efficiency fiber reinforcement material, which effectively reduces the overall material cost under the same performance requirements, while avoiding the impact of radial bamboo strip price fluctuations on production costs in traditional processes.

[0015] Preferably, the selected materials are all green renewable resources or recyclable materials, and the emission of harmful substances and energy consumption are reduced during the production process, which meets the requirements of modern engineering for green building materials and low-carbon production.

[0016] Compared with the prior art, the present invention provides a manufacturing process for bamboo winding tubes with radial fiber reinforcement, which has the following beneficial effects: The manufacturing process of this radially fiber-reinforced bamboo-wound pipe introduces high-strength fiber axial "main reinforcements," resulting in an order-of-magnitude increase in the pipe's axial load-bearing capacity, easily meeting the requirements for high ring stiffness and complex loads. This innovative structure breaks through the performance bottleneck of traditional bamboo-wound pipes caused by the upper limit of the mechanical properties of bamboo itself, significantly improving the overall mechanical properties of the pipe and broadening the application range of bamboo-wound pipes in high-pressure, large-diameter, and other high-end engineering fields.

[0017] This radial fiber reinforced bamboo winding tube manufacturing process effectively reduces overall material costs while maintaining the same performance requirements by using inexpensive pure circumferential bamboo strips as the main structural material, combined with a small amount of high-efficiency fiber reinforcement materials (such as glass fiber and basalt fiber). Compared with traditional all-bamboo winding structures, this invention not only avoids the extensive use of expensive radial bamboo strips, but also reduces the production cost risk caused by fluctuations in the price of radial bamboo strips.

[0018] The manufacturing process of this radially fiber-reinforced bamboo-wound pipe allows for flexible adjustment and replacement of the fiber type, number of layers, or laying thickness of the axial reinforcement layer, as well as the number and thickness of the circumferential bamboo strip layer, according to specific engineering needs and pipe usage conditions. This design flexibility enables the pipe's mechanical properties to be customized, much like "reinforcement," thereby meeting the complex loads and high ring stiffness requirements of different application scenarios. Attached Figure Description

[0019] Figure 1 This invention provides a schematic flowchart of a bamboo winding tube manufacturing process with radial fiber reinforcement. Figure 1 ; Figure 2 This is a schematic diagram of the pipe structure produced by the radial fiber reinforced bamboo winding pipe manufacturing process proposed in this invention. Figure 3 This invention provides a schematic flowchart of a bamboo winding tube manufacturing process with radial fiber reinforcement. Figure 2 ; Figure 4 This is a schematic diagram of the circumferential bamboo strip structure in the production process of a bamboo winding tube with radial fiber reinforcement proposed in this invention. Detailed Implementation

[0020] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings. Example

[0021] like Figures 1-4 As shown in the figure, an embodiment of the present invention proposes a production process for bamboo-wound pipes with radial fiber reinforcement. The process includes the following steps: Pre-treatment and processing of raw bamboo: Select high-quality raw bamboo, ensuring it is free from insects and cracks. Process the raw bamboo into uniform strips with a width of 3mm to 5mm and a thickness of 0.8mm to 1.2mm using mechanical cutting or manual splitting. Then, using basalt fiber rope as the weaving material, the bamboo strips are tightly woven into bamboo strips with a width of 16cm using double-lock plain weave weaving technology, serving as backup material for subsequent circumferential winding. The inner lining preparation and laying steps: Select epoxy resin-impregnated glass fiber felt as the inner lining material. Use a high-precision winding machine to evenly and tightly wind it onto the surface of a pre-prepared mold, forming a smooth, bubble-free pipe lining that provides good inner wall support and impermeability. The initial winding step of the circumferential bamboo strip layer: Pre-treated bamboo strips are impregnated in phenolic resin, ensuring full penetration. Then, they are wound circumferentially onto a mold using mechanical or manual methods to form the initial circumferential bamboo strip layer. The winding thickness is set at 80mm, focusing on providing circumferential pressure resistance and forming the tube base. A circumferential bamboo strip layer with uniform bamboo strips and tightly woven bamboo strips was successfully prepared. The inner lining is smooth and bubble-free, laying a good foundation for subsequent processing steps.

[0022] In this invention, the axial reinforcement layer laying step involves laying a longitudinal main "reinforcing layer" on the already wound circumferential bamboo strip layer. High-performance basalt fiber strips impregnated with phenolic resin are evenly laid longitudinally as the core "ribs," providing axial tensile strength and circumferential bending strength. The laying thickness is precisely calculated and adjusted to 2mm. The axial reinforcement layer is laid evenly without overlap or gaps, significantly improving the axial tensile strength and circumferential bending strength of the pipe.

[0023] In this invention, the fiber orientation of the axial reinforcement layer is controlled: when laying the high-performance fiber strips of the axial reinforcement layer, the fiber orientation is ensured to be completely consistent with the pipe axis. Through precise mechanical control or strict manual operation procedures, the strips are guaranteed to be free of overlap or gaps, maximizing the axial reinforcement effect. Accurate fiber orientation and tight, gap-free strip laying significantly improve the axial reinforcement effect.

[0024] In this invention, the overall binding reinforcement step involves the following: after the axial reinforcement layer is laid, basalt fiber cloth impregnated with phenolic resin is used to wrap the laid layers circumferentially. Each layer is then bound mechanically or manually, with the binding layer thickness set at 1 mm, to enhance the overall integrity and shear resistance of the pipeline. This significantly enhances the pipeline's overall integrity, greatly improves its shear resistance, and ensures a tight bond between the layers without loosening.

[0025] In this invention, the secondary circumferential bamboo strip winding step involves wrapping bamboo strips impregnated with phenolic resin around the mold again after the overall binding and reinforcement step to form a second circumferential bamboo strip layer. The winding thickness is set to 50mm to further enhance the circumferential strength and stability of the pipe. The circumferential strength of the pipe is significantly enhanced, its stability is improved, and it can withstand greater circumferential pressure.

[0026] In this invention, the outer surface protective layer coating step involves uniformly coating a layer of polyurethane resin onto the outer surface of the wound bamboo pipe as a waterproof and anti-corrosion protective layer. The coating thickness is set at 0.5 mm to ensure the long-term durability of the pipe. This forms a uniform and dense protective layer on the outer surface of the pipe, effectively preventing the intrusion of moisture and corrosive substances, thus extending the pipe's service life.

[0027] This invention employs a layered manufacturing method: Each step is independent yet closely coordinated through precise mechanical control or strict manual operation procedures, ensuring a high degree of controllability in the production process and stable product quality. Simultaneously, this method facilitates the construction and upgrading of automated or semi-automated production lines, improving production efficiency and product quality. The highly controllable production process, stable and reliable product quality, and significantly enhanced production efficiency lay a solid foundation for industrialization.

[0028] In this invention, mechanical properties are customized: based on specific engineering requirements and pipeline usage conditions, the fiber type (such as glass fiber, basalt fiber, carbon fiber), number of layers, or laying thickness of the axial reinforcement layer, as well as the number and thickness of the circumferential bamboo strip layer, can be flexibly adjusted and replaced to customize the pipeline's mechanical properties and meet the complex loads and high ring stiffness requirements of different application scenarios. The customizable mechanical properties of the pipeline adapt to different engineering needs, improving the product's applicability and market competitiveness.

[0029] In this invention, material selection and cost control are key advantages. By using inexpensive circumferential bamboo strips as the main structural material, combined with a small amount of high-efficiency fiber reinforcement (such as glass fiber and basalt fiber), the overall material cost is effectively reduced while maintaining the same performance requirements. Simultaneously, it avoids the impact of radial bamboo strip price fluctuations on production costs in traditional processes, thus improving economic efficiency. While ensuring pipe performance, the overall material cost is significantly reduced, economic benefits are enhanced, and the product's market competitiveness is strengthened.

[0030] This invention prioritizes environmental protection and sustainable development: all materials used are green and renewable resources (such as bamboo) or recyclable materials (such as fiberglass and basalt fiber), and the production process minimizes the emission of harmful substances and energy consumption. By optimizing the production process and equipment selection, the environmental impact of production is further reduced, meeting the requirements of modern engineering for green building materials and low-carbon production. The production process is environmentally friendly and sustainable, reducing environmental pollution and resource waste, aligning with the development trends and requirements of modern engineering.

[0031] Finally, it should be noted that the basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, and therefore remain within the spirit and scope of the exemplary embodiments of this specification. Furthermore, this specification uses specific terms to describe embodiments of this specification. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined. Moreover, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods of this specification.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing process for bamboo wound tubes with radial fiber reinforcement, characterized in that, The process includes the following detailed steps: Raw bamboo pretreatment and processing steps: Select raw bamboo, remove knots and impurities, and process the raw bamboo into uniform bamboo strips with a width of 3mm to 5mm and a thickness of 0.8mm to 1.2mm by mechanical cutting or manual splitting; then, use basalt fiber rope as weaving material, and tightly weave the bamboo strips into bamboo strips with a width of 10cm to 20cm by double-lock plain weave technique, as a spare material for subsequent circumferential winding; Inner lining preparation and laying steps: Select glass fiber felt impregnated with epoxy resin as the inner lining material, and use a winding machine to evenly and tightly wind it onto the surface of the pre-prepared mold to form the inner lining of the pipe. Ensure that the inner lining is smooth and free of air bubbles to provide good inner wall support and seepage prevention performance. The first winding step of the circumferential bamboo strip layer: The pre-treated bamboo strips are immersed in phenolic resin. After ensuring full penetration, they are wound circumferentially onto the mold by mechanical or manual means to form the initial circumferential bamboo strip layer. The thickness of this layer is set to 60mm to 100mm according to the pipe design requirements, focusing on providing circumferential pressure resistance and forming the pipe body base.

2. The bamboo winding tube production process according to claim 1, characterized in that, It also includes the axial reinforcement layer laying step: laying the longitudinal main "main reinforcement layer", in which high-performance fiber strips impregnated with phenolic resin are evenly laid longitudinally onto the already wound circumferential bamboo strip layer as the core "ribs" to provide axial tensile strength and circumferential bending strength. The laying thickness is precisely calculated and adjusted to 1mm to 5mm according to the mechanical performance requirements of the pipeline.

3. The bamboo winding tube production process according to claim 2, characterized in that, When laying the high-performance fiber strips of the axial reinforcement layer, ensure that the fiber direction is consistent with the axial direction of the pipe and that there is no overlap or gap between the strips to maximize the axial reinforcement effect.

4. The bamboo winding tube production process according to claim 3, characterized in that, It also includes an overall binding reinforcement step: after the axial reinforcement layer is laid, basalt fiber cloth or other high-performance fiber cloth impregnated with phenolic resin is used to wrap the laid layers in a circumferential manner, and the layers are bound by mechanical or manual means to enhance the integrity and shear resistance of the pipeline. The thickness of the binding layer is 0.5mm to 2mm.

5. The bamboo winding tube production process according to claim 4, characterized in that, It also includes a secondary circumferential bamboo strip winding step: after the overall binding and reinforcement step, the bamboo strips impregnated with phenolic resin are wound circumferentially onto the mold again to form a second circumferential bamboo strip layer. The thickness of this layer is set to 40mm to 60mm according to the pipe design requirements to further enhance the circumferential strength and stability of the pipe.

6. The bamboo winding tube production process according to claim 5, characterized in that, It also includes the outer surface protective layer coating step: a layer of polyurethane resin or other high-performance waterproof and anti-corrosion material is evenly coated on the outer surface of the wound bamboo pipe to form a waterproof and anti-corrosion protective layer. The coating thickness is set to 0.2mm to 1mm according to the usage environment and requirements to ensure the durability of the pipe for long-term use.

7. The layered manufacturing method of bamboo winding tube production process according to any one of claims 1 to 6, characterized in that, Each step is independent yet closely coordinated through precise mechanical control or strict manual operation procedures, ensuring a high degree of controllability in the production process and stability of product quality, while also facilitating the construction and upgrading of automated or semi-automated production lines.

8. The layered manufacturing method of the bamboo winding tube production process according to claim 7, characterized in that, Depending on specific engineering needs and pipeline usage conditions, the fiber type, number of layers, or laying thickness of the axial reinforcement layer, as well as the number and thickness of the circumferential bamboo strip layer, can be flexibly adjusted and replaced to customize the mechanical properties of the pipeline and meet the complex load and high ring stiffness requirements of different application scenarios.

9. The layered manufacturing method of the bamboo winding tube production process according to claim 8, characterized in that, By using inexpensive circumferential bamboo strips as the main structural material, combined with a small amount of high-efficiency fiber reinforcement, the overall material cost is effectively reduced under the same performance requirements, while avoiding the impact of radial bamboo strip price fluctuations on production costs in traditional processes.

10. The layered manufacturing method of the bamboo winding tube production process according to claim 9, characterized in that, All materials selected are green, renewable, or recyclable resources, and the production process reduces the emission of harmful substances and energy consumption, meeting the requirements of modern engineering for green building materials and low-carbon production.

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