Non-woven geotextile

Abstract

The utility model relates to a non-woven geotextile. The non-woven geotextile comprises an upper-row spun yarn and a lower-row spun yarn, and the upper-row spun yarn swings in the first direction; the lower-row spun yarns swing in the second direction, and the lower-row spun yarns and the upper-row spun yarns are fixedly connected with each other; wherein the second direction is different from the first direction, and the fineness of monofilament fibers of the lower-row spinning is different from that of monofilament fibers of the upper-row spinning. The geotextile provided by the utility model has high water permeability and drainage performance, and the service life of an engineering main body can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical materials technology, and more specifically, to a nonwoven geotextile. Background Technology

[0002] Currently, various geotechnical materials are used in civil engineering to cope with complex construction conditions. In water conservancy projects and rainy environments, if the main structure is not drained in time, the internal pressure gradually increases as rainwater continues to flow in, leading to the collapse of the structure, thereby reducing its service life and increasing project costs.

[0003] Therefore, there is an urgent need to design a geotextile material with high permeability. Utility Model Content

[0004] One object of this invention is to provide a nonwoven geotextile to at least solve one of the problems in the prior art.

[0005] According to a first aspect of the present invention, a nonwoven geotextile is provided, comprising:

[0006] Upper row of spinning, wherein the upper row of spinning is oscillating along a first direction;

[0007] The lower row of spinning is spun along a second direction, and the lower row of spinning is fixedly connected to the upper row of spinning.

[0008] Wherein, the second direction is different from the first direction, and the fineness of the monofilament fibers in the lower row of spinning is different from that in the upper row of spinning.

[0009] Optionally, the second direction forms an angle of 30° to 90° with the first direction.

[0010] Optionally, the second direction is perpendicular to the first direction.

[0011] Optionally, the fineness of the monofilament fibers in the upper row of spinning is smaller than that in the lower row of spinning, and the strength ratio of the geotextile along the first direction to the second direction is (0.9~1.1):1.

[0012] Optionally, the fineness of the monofilament fibers in the upper row of spinning is 5D to 7D, and the fineness of the monofilament fibers in the lower row of spinning is 9D to 12D.

[0013] Optionally, the strength of the monofilament fibers in the upper row of spinning is ≥3.5 CN / dtex.

[0014] Optionally, the monofilament fiber strength of the lower row of spinnerets is ≥3CN / dtex.

[0015] Optionally, both the upper and lower spinning rows are made of polypropylene filaments.

[0016] Optionally, the upper spinning row and the lower spinning row are either single-layer spinning or multi-layer spinning, respectively.

[0017] Optionally, the upper spinning row and the lower spinning row are connected and fixed by a needle punching process.

[0018] One technical advantage of this utility model is:

[0019] This invention improves the drainage and permeability of the entire nonwoven geotextile by setting up double rows of spinning with different spinning directions and different fiber fineness, so that the coarser row of spinning can form a wider drainage channel. When applied to water conservancy projects, the drainage channels formed by the nonwoven geotextile can achieve the purpose of rapid drainage and permeability, thereby improving the service life of the project and reducing the project cost.

[0020] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0022] Figure 1 This is a structural schematic diagram of the nonwoven geotextile provided by this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Bottom row spinning; 2. Top row spinning. Detailed Implementation

[0025] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0026] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0027] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0028] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] like Figure 1 As shown, according to a first aspect of the present invention, a nonwoven geotextile is provided, comprising: an upper row of spinning fibers 2 and a lower row of spinning fibers 1; the upper row of spinning fibers 2 is spun along a first direction; the lower row of spinning fibers 1 is spun along a second direction, and the lower row of spinning fibers 1 and the upper row of spinning fibers 2 are fixedly connected to each other; wherein, the second direction is different from the first direction, and the fineness of the monofilament fibers of the lower row of spinning fibers 1 is different from the fineness of the monofilament fibers of the upper row of spinning fibers 2.

[0031] Specifically, in this embodiment, the provided nonwoven geotextile is composed of double-row spinning with different spinning directions and different fiber fineness, which are fixedly connected to each other. The upper row of spinning filaments 2 spinning along the first direction means that multiple monofilaments are adjacent to each other in a row and extend uniformly along the first direction (i.e., the length direction of the fibers in the upper row of spinning filaments 2 is all in the first direction); while the lower row of spinning filaments 1 spinning along the second direction means that multiple monofilaments are adjacent to each other in a row and extend uniformly along the second direction (i.e., the length direction of the fibers in the lower row of spinning filaments 1 is all in the second direction).

[0032] By setting the spun yarn direction of the upper row of yarns 2 to be different from that of the lower row of yarns 1, the upper row of yarns 2 and the lower row of yarns 1 can intersect each other at a set angle, ultimately forming a geotextile with a relatively uniform fiber web in the same direction. This allows rainwater to flow out along a first or second direction, and facilitates the passage of accumulated water through the gaps in the intersecting mesh. Furthermore, the fiber fineness of the lower row of yarns 1 is different from that of the upper row of yarns 2, allowing the coarser fiber row to form wider drainage channels, further improving the drainage speed of the geotextile along the set direction.

[0033] When the aforementioned geotextiles with high permeability and drainage properties are applied to water conservancy projects, accumulated water in the main structure can be drained in a timely manner, preventing excessive internal pressure that could lead to project collapse, thus extending the project's service life and reducing costs. Furthermore, the filament arrangement of the upper spinning layer 2 and the lower spinning layer 1 allows the resulting fiber web geotextile to simultaneously filter granular materials such as sand and gravel, reducing the risk of sand and gravel loss and ensuring the reliability of the project.

[0034] In the above embodiments, fiber fineness refers to the weight in grams of a 9000-meter-long fiber at a standard moisture regain, which is an important indicator for measuring the fineness of fibers. In this application, fiber fineness refers to the fineness of the monofilament fibers of the upper spinning row 2 or the lower spinning row 1.

[0035] In practical applications, the difference in fiber fineness in different directions of the geotextile allows the coarser fiber fineness of the upper row of spindles 2 (or lower row of spindles 1) to form rapid drainage channels, thereby improving the overall drainage and permeability of the geotextile. Meanwhile, the finer fiber fineness of the lower row of spindles 1 (or upper row of spindles 2) provides greater fiber strength. Furthermore, the upper row of spindles 2 and lower row of spindles 1 are fixedly connected, enhancing the overall strength of the geotextile and making it less susceptible to damage. This ensures the reliability of the geotextile in engineering applications from both drainage and strength perspectives. It should be noted that the terms "upper" and "lower" in "upper row of spindles 2" and "lower row of spindles 1" in this application are only used to distinguish the two rows of spindles and do not limit their specific orientation in practice.

[0036] In one embodiment, the upper row of spinning filaments 2 and the lower row of spinning filaments 1, respectively, are spun along a first direction and a second direction using a double-row spinning mechanism, with a spacing of 4-5 meters between the two rows. One row employs airflow stretching to form the lower row of spinning filaments 1 with relatively thicker monofilaments, serving as drainage channels aligned with the geotextile skeleton. The other row of spinning filaments employs a composite stretching method combining airflow stretching and mechanical stretching. The mechanical stretching can be staged stretching, using varying stretching conditions such as speed and temperature to form the upper row of spinning filaments 2 with finer monofilaments, which possess strong fiber strength, providing strength to the geotextile. Furthermore, the upper row of spinning filaments 2 and the lower row of spinning filaments 1 can be reinforced by needle punching or weaving to form a uniform fiber web geotextile with certain mechanical properties.

[0037] In the above embodiments, other production processes can be added to improve the geotextile according to actual needs. For example, the geotextile can be bidirectionally stretched to form a fixed width by using a tenter frame to adapt to different application environments. An automatic winding device can also be used to complete the winding and packaging of the product according to customer needs for engineering use. This application does not limit these aspects.

[0038] Optionally, the second direction forms an angle of 30° to 90° with the first direction.

[0039] Specifically, the upper row of spindles 2 and the lower row of spindles 1, with different fiber fineness, are laid at a certain predetermined angle to each other, which is beneficial for the formation of drainage channels and the improvement of overall strength. However, if the angle between the two rows of spindles is too small, it will affect drainage performance and is not conducive to setting the drainage direction of the geotextile. In this embodiment, by setting the angle between the second direction and the first direction to 30°–90°, such as 50°, 60°, or 80°, it can be ensured that the drainage channels formed between the coarser spindles can discharge rainwater and other accumulated water into the designated area along the predetermined direction, minimizing the discharge of accumulated water from between the finer spindles into other areas of the project, thus optimizing the drainage performance of the geotextile.

[0040] In the above embodiments, the fiber fineness of the multiple monofilaments in the upper row of spinning 2 can be the same or different, and the fiber fineness of the multiple monofilaments in the lower row of spinning 1 can be the same or different. However, the overall fiber fineness of the monofilaments in the upper row of spinning 2 needs to be greater than or less than the fiber fineness of the monofilaments in the lower row of spinning 1. This allows the geotextile to prioritize drainage performance in one direction and strength enhancement in the other, thereby ensuring both drainage and strength performance and improving the reliability of its application in engineering projects.

[0041] Optionally, such as Figure 1 As shown, the second direction is perpendicular to the first direction.

[0042] Specifically, the second direction being perpendicular to the first direction means that the swaying direction of the upper spinning layer 2 is at 90° to the swaying direction of the lower spinning layer. In this embodiment, this angle can improve the consistency of the drainage direction of rainwater and other accumulated water, maximize the drainage capacity of the geotextile, and further ensure the drainage performance of the geotextile.

[0043] Optionally, such as Figure 1 As shown, the fineness of the monofilament fibers in the upper row of spinning 2 is smaller than that in the lower row of spinning 1, and the strength ratio of the geotextile along the first direction to the second direction is (0.9~1.1):1.

[0044] Specifically, in practical applications, the overall strength of the geotextile can prevent damage during engineering projects, ensuring its drainage and permeability performance. In this embodiment, a large difference in strength between the geotextile along the first and second directions can lead to insufficient strength in one direction, making the geotextile susceptible to damage in that direction, or excessive strength in another direction, increasing the cost of the geotextile. Setting the strength ratio between the first and second directions to (0.9–1.1):1, such as (0.9:1), (1:1), or 1.1:1, minimizes the strength difference in each direction, meeting engineering strength requirements while reducing production costs.

[0045] Optionally, such as Figure 1 As shown, the fineness of the monofilament fibers in the upper row of spinning 2 is 5D to 7D, and the fineness of the monofilament fibers in the lower row of spinning 1 is 9D to 12D.

[0046] Specifically, in this embodiment, the fiber strength of the lower row of spun fibers 1 is set to be greater than that of the upper row of spun fibers 2. This means that the monofilaments of the lower row of spun fibers 1 can form drainage channels to ensure excellent drainage and permeability of the geotextile. Meanwhile, the monofilaments of the upper row of spun fibers 2 have a higher fiber strength to ensure the overall strength of the geotextile. The fiber fineness of the upper row of spun fibers 2 is 5D–7D, and that of the lower row of spun fibers 1 is 9D–12D. This ensures that the difference in strength between the geotextile in the first and second directions is small, thus simultaneously satisfying both drainage and strength performance requirements.

[0047] In the above embodiments, the fiber fineness of the upper row of spinning 2 is 5D to 7D, which means that when the length of the monofilament of the upper row of spinning 2 is 9000 meters, its weight is 5g to 7g. This indicates higher fiber strength compared to the fiber fineness of the lower row of spinning 1, which is 9D to 12D. Conversely, the fiber fineness of the lower row of spinning 1 is 9D to 12D, which means that when the length of the monofilament of the upper row of spinning 2 is 9000 meters, its weight is 9g to 12g. This indicates that the lower row of spinning 1 is thicker than the upper row of spinning 2 monofilaments, which is beneficial for forming drainage channels and meeting the drainage and permeability requirements of the geotextile.

[0048] In practical applications, the above values ​​can be adjusted adaptively according to actual needs. Specifically, the fineness of the monofilament fibers in the upper row of spinning filaments 2 can be the same value (5D to 7D) or different values, while the fineness of the monofilament fibers in the lower row of spinning filaments 1 can be the same value (9D to 12D) or different values, to ensure the difference in fiber fineness along the first and second directions of the geotextile. Furthermore, selecting the monofilament fiber fineness in each direction within the above range can meet the drainage and strength requirements of most projects, reducing project costs.

[0049] Optionally, the monofilament fiber strength of the upper row of spinning 2 is ≥3.5 CN / dtex.

[0050] Specifically, fiber strength typically refers to the maximum load a fiber can withstand under continuously increasing load until it breaks, and it largely determines the durability of the geotextile. Setting the monofilament fiber strength of the upper row of spinnerets 2 to ≥3.5 CN / dtex means that the maximum tensile force per unit linear density of the monofilaments in the upper row of spinnerets 2 can withstand is 3.5 CN, ensuring the overall strength of the geotextile in the first direction. Since the fiber fineness of the upper row of spinnerets 2 is 5D–7D and the lower row of spinnerets 1 is 9D–12D respectively, the fiber strength of the lower row of spinnerets 1 can also be guaranteed within the set range, ensuring the strength of the geotextile in the second direction.

[0051] Optionally, the single filament fiber strength of the lower spinning layer 1 is ≥3CN / dtex, which not only ensures the overall strength of the geotextile, but also reduces the production cost of the lower spinning layer 1.

[0052] Optionally, both the upper spinning filament 2 and the lower spinning filament 1 are made of polypropylene filaments.

[0053] Specifically, polypropylene is a thermoplastic polymer that can withstand the erosion of most acids and alkalis, and has good heat resistance and weather resistance. Using it as a spinning material for geotextiles can improve their service life. Furthermore, polypropylene has excellent tensile strength and elongation at break, allowing it to be processed into longer fiber filaments, reducing production costs. These filaments refer to continuous filaments, a type of chemical fiber with a continuous and very long length. Compared to the short filaments used in existing geotextile processing techniques, this improves the strength of the geotextile and allows for production of geotextiles in different sizes.

[0054] Furthermore, geotextiles made from polypropylene filaments ensure overall strength and improve service life through both material and processing methods. The filaments also facilitate consistent yarn direction during the spinning of the upper or lower rows of yarns, creating drainage channels that promote rapid water discharge and enhance the geotextile's drainage performance.

[0055] Optionally, the upper spinning row 2 and the lower spinning row 1 are either single-layer spinning or multi-layer spinning, respectively.

[0056] Specifically, in practical applications, when the geotextile provided in this application has both the upper spinning layer 2 and the lower spinning layer 1 set to single layers, it can already meet the performance requirements of basic hydraulic engineering for geotextiles, greatly reducing production costs. In some projects with different performance requirements for strength or drainage, it can also be achieved by setting both the upper spinning layer 2 and / or the lower spinning layer to multi-layer spinning, and this application does not impose any restrictions on this.

[0057] Optionally, the upper spinning row 2 and the lower spinning row 1 are connected and fixed by a needle punching process.

[0058] Specifically, in actual production, needle punching is a nonwoven manufacturing process that uses forked needles to pry fiber bundles out of the fabric surface of a fiber web or nonwoven fabric, thereby reinforcing the fiber web or forming loops, nap, or patterns on the fabric surface. When needle punching is used for reinforcement, the repeated piercing of the needles effectively prys out and entangles the fiber bundles in the fiber web, improving the strength and stability of the fiber web.

[0059] In this embodiment, needle punching is used to connect and fix the upper row of spinning fibers 2 and the lower row of spinning fibers 1. This increases the number of entanglement points between the upper row of spinning fibers 2 and the lower row of spinning fibers 1, thereby improving the structural strength and stability of the geotextile. When applied to water conservancy projects, this can improve the reliability and service life of the project. In addition, needle punching reinforcement is more efficient and less costly than other connection methods such as weaving.

[0060] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0061] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A nonwoven geotextile, characterized in that, include: Upper row of spinning, wherein the upper row of spinning is oscillating along a first direction; The lower row of spinning is spun along a second direction, and the lower row of spinning is fixedly connected to the upper row of spinning. Wherein, the second direction is different from the first direction, and the fineness of the monofilament fibers in the lower row of spinning is different from that in the upper row of spinning.

2. The nonwoven geotextile according to claim 1, characterized in that, The second direction forms an angle of 30° to 90° with the first direction.

3. The nonwoven geotextile according to claim 1, characterized in that, The second direction is perpendicular to the first direction.

4. The nonwoven geotextile according to claim 1, characterized in that, The fineness of the monofilament fibers in the upper row of spinning is smaller than that in the lower row of spinning, and the strength ratio of the geotextile along the first direction to the second direction is (0.9~1.1):

1.

5. The nonwoven geotextile according to claim 1, characterized in that, The fineness of the monofilament fibers in the upper row of spinning is 5D to 7D, and the fineness of the monofilament fibers in the lower row of spinning is 9D to 12D.

6. The nonwoven geotextile according to claim 5, characterized in that, The strength of the single filament fiber in the upper row of spinning is ≥3.5 CN / dtex.

7. The nonwoven geotextile according to claim 6, characterized in that, The single filament fiber strength of the lower row of spinning is ≥3CN / dtex.

8. The nonwoven geotextile according to claim 1, characterized in that, Both the upper and lower spinning rows are made of polypropylene filaments.

9. The nonwoven geotextile according to claim 1, characterized in that, The upper spinning row and the lower spinning row are either single-layer spinning or multi-layer spinning, respectively.

10. The nonwoven geotextile according to claim 1, characterized in that, The upper row of spinning yarns and the lower row of spinning yarns are connected and fixed by a needle punching process.

Images