Sound-absorbing flame-retardant multi-layer woven fabric, method for manufacturing the same, and application thereof in interior decoration fabric

Abstract

This invention discloses a sound-absorbing and flame-retardant multilayer woven fabric, its preparation method, and its application in interior decorative fabrics, relating to the field of functional textile materials technology. The multilayer woven fabric comprises a surface layer, a middle layer, and an inner layer, which are integrally connected via a bottom-to-top joint. The surface layer employs a honeycomb weave based on a twill weave, characterized by a regular, convex-concave cell structure. The middle and inner layers employ a plain weave. The interlayer joints between the surface, middle, and inner layers are periodically distributed along the warp or weft direction. Each period includes several consecutive non-jointed areas with no joints and at least one joined area with a joint, forming a periodic strip-shaped hollow layer between the three layers. Through the synergistic design of the honeycomb surface structure, the multilayer porous weave structure, and the periodic hollow layer structure, the multilayer woven fabric of this invention creates multi-level sound energy dissipation paths within the fabric, thereby improving the overall sound absorption performance of the fabric.

Description

Technical Field

[0001] This invention belongs to the field of functional textile materials technology, and particularly relates to sound-absorbing and flame-retardant multilayer woven fabrics, their preparation methods, and their application in interior decorative fabrics. Background Technology

[0002] With the continuous advancement of urbanization, noise pollution in building interiors is becoming increasingly prominent. Environmental noise generated by traffic, commercial, and public activities easily enters indoor spaces through building envelopes such as doors and windows, affecting not only the comfort of living and working environments but also potentially causing adverse effects on human psychological and physiological health. Commonly used hard materials in interiors, such as glass and concrete, have a strong reflective effect on sound waves, easily creating reverberation fields. Therefore, it is necessary to introduce flexible materials with sound-absorbing functions to regulate the indoor acoustic environment. Curtains, as decorative fabrics with a large area of ​​use indoors and located near doors and windows, possess both decorative and functional attributes, making them one of the important carriers for achieving flexible sound absorption indoors.

[0003] Meanwhile, curtain fabrics, as soft furnishing materials used extensively in building interiors, also pose a certain risk of combustion under fire conditions. Traditional textile decorative materials are mostly made of ordinary polyester, cotton, or blended materials, which are easily ignited or melt and drip when exposed to fire. The flames spread rapidly and may release large amounts of smoke, posing significant safety hazards. Therefore, in addition to sound absorption properties, curtain fabrics also need to possess good flame-retardant properties to meet the fire safety requirements for building interior decoration materials.

[0004] To address these needs, various sound-absorbing materials have been developed in existing technologies, such as foam materials, mineral wool, non-woven composite materials, and porous sound-absorbing panels. While these materials possess certain sound-absorbing properties, they typically suffer from drawbacks such as excessive thickness, poor flexibility, or insufficient decorative appeal, making them unsuitable for direct use as curtain fabrics. To improve sound absorption, existing technologies often achieve sound energy dissipation by increasing material thickness, incorporating interlayers, or using composite porous materials. However, these structures tend to result in a heavy and rigid overall material, failing to meet the requirements of curtain fabrics for softness, drape, and decorative appeal.

[0005] For example, patent CN104746238A discloses a meltblown nonwoven sound-absorbing material that improves the internal structure of the material by adjusting the fiber packing density to enhance its sound absorption performance. However, this solution belongs to the nonwoven material structure, and its internal structure is formed by random fiber packing, resulting in a relatively loose overall structure. It is difficult to achieve the desired decorative properties, drape, and structural stability of a fabric, and therefore it is not suitable for direct use as a curtain fabric.

[0006] Furthermore, patent CN105463687A discloses a warp-knitted sound-absorbing material that uses a warp-knitted spacer fabric structure to form a spatially structured fabric, thereby improving the propagation path of sound waves within the material. However, this solution belongs to a warp-knitted three-dimensional spacer fabric structure, whose structure mainly relies on spacer yarns to form a thick spatial structure. The overall fabric thickness is relatively large, and the structure is relatively loose, making it more suitable for functional filling materials or sound insulation pads. Compared with the layered structure formed by the interlacing of warp and weft yarns in woven fabrics, this type of warp-knitted structure has certain limitations in terms of fabric surface morphology control, designability of the weave structure, and the softness and drape required for curtain fabrics.

[0007] For example, patent CN220500182U discloses a sound-absorbing wall covering that enhances sound wave scattering and absorption by setting protrusions or pores on the material surface. However, this solution mainly relies on the non-woven material and its surface structure design to achieve sound absorption. Its sound absorption mechanism is mainly concentrated on the scattering effect of the fabric surface, lacking overall control over the pore distribution and interlayer structure in the fabric thickness direction. At the same time, non-woven materials are usually formed by random stacking of fibers, and their structural stability and designability are low, making it difficult to achieve precise control over the pore structure.

[0008] In summary, existing sound-absorbing material technologies mainly focus on optimizing the structure of nonwoven materials and designing warp-knitted spacing or surface structures, while structural sound-absorbing designs for woven curtain fabrics remain relatively limited. Furthermore, regarding flame retardancy, existing curtain fabrics often achieve fire resistance through flame-retardant finishing or coatings. These finishing processes may block or fill the fabric's pore structure, thus affecting its original breathability and sound absorption. Therefore, it is necessary to propose a structurally sound, technologically feasible woven curtain fabric that combines sound absorption and flame retardancy to meet the comprehensive needs of interior decorative fabrics in terms of acoustic environment improvement and fire safety.

[0009] This invention proposes a sound-absorbing and flame-retardant three-layer integrated woven fabric and its preparation method. The fabric is formed integrally by connecting the outer layer, middle layer, and inner layer in the same weaving process through a bottom-to-top bonding method. All three layers are woven with inherently flame-retardant yarns, thereby achieving flame-retardant properties of the fabric without the need for flame-retardant coatings or finishing treatments. Summary of the Invention

[0010] The purpose of this invention is to provide a sound-absorbing and flame-retardant multilayer woven fabric and its preparation method, as well as its application in interior decorative fabrics, to solve the problems mentioned in the background art, such as the lack of structured sound-absorbing design in existing sound-absorbing material technologies and the lack of curtain woven fabrics that have both sound-absorbing and flame-retardant properties.

[0011] To achieve the above objectives, the present invention employs the following technical solution:

[0012] The present invention provides a sound-absorbing and flame-retardant multilayer woven fabric in a first aspect, the multilayer woven fabric comprising a top layer, a middle layer and an inner layer from top to bottom, the top layer, the middle layer and the inner layer being integrally connected by a bottom-to-top connection method; The surface layer uses a honeycomb structure formed by variations of a twill weave, which has a regular, uneven cell structure to enhance the incidence of sound waves and surface scattering; the middle and inner layers use a plain weave. The interlayer joints between the outer, middle, and inner layers are periodically distributed along the warp or weft direction. Each period includes several consecutive weave cycles without joints and at least one weave cycle with joints, forming a periodic strip-shaped hollow layer between the three layers to extend the sound wave propagation path and enhance the sound absorption effect of the fabric. The periodic strip-shaped hollow layer is located in the cell interlacing area of ​​the honeycomb weave to achieve the connection of the three layers while maintaining the surface structure of the honeycomb cells.

[0013] The present invention employs a honeycomb structure on the surface of the fabric to form a regular concave-convex cell structure on the fabric surface, thereby improving the sound wave incident conditions and enhancing the sound wave scattering effect on the fabric surface. This invention utilizes the differential configuration of yarn linear density and weave structure in a three-layer woven structure to create a multi-layer porous woven structure with progressively varying airflow resistance in the fabric thickness direction, thereby facilitating the propagation of sound waves layer by layer within the fabric and generating energy dissipation. This invention controls the periodic distribution of indirect nodes in the control layers to form a periodic strip-shaped hollow layer between the three layers, thereby extending the propagation path of sound waves inside the fabric and enhancing the sound absorption effect.

[0014] The above structure, through the synergistic design of honeycomb surface structure, multi-layer porous woven structure and periodic hollow layer structure, forms a multi-level sound absorption mechanism of "surface scattering - interlayer transmission - cavity dissipation", forming a multi-level sound energy dissipation path inside the fabric, thereby improving the overall sound absorption performance of the fabric.

[0015] Preferably, the linear density of the yarns used in the outer layer, middle layer and inner layer increases sequentially. The three layers of yarns are configured with different linear densities, and the linear density of the yarns used increases layer by layer from the outer layer to the inner layer, so that the fabric thickness direction forms a multi-layer porous woven structure with gradually changing air flow resistance, which is conducive to the propagation and dissipation of sound waves in the fabric layer by layer.

[0016] More preferably, the yarn count of the outer layer is 18s to 24s, the yarn count of the middle layer is 14s to 18s, and the yarn count of the inner layer is 10s to 14s, with corresponding yarn linear densities (tex) of 25 to 33 tex, 33 to 42 tex, and 42 to 60 tex, respectively.

[0017] Preferably, the outer, middle, and inner layers are all woven from flame-retardant chemical fiber yarns, thereby achieving flame-retardant properties of the fabric without the need for flame-retardant coatings or finishing treatments. The use of inherently flame-retardant fiber materials allows the fabric to maintain stable flame-retardant properties while preserving the integrity of its pore structure.

[0018] More preferably, the outer layer, middle layer and inner layer are all woven from flame-retardant polyester fiber yarn; More preferably, the flame-retardant polyester fiber yarn is a phosphorus-containing flame-retardant polyester fiber yarn with a phosphorus content of 6500–6800 ppm. More specifically, its phosphorus content is approximately 6700 ppm. This type of flame-retardant fiber introduces flame-retardant components into the polyester molecular structure, giving the fiber stable, inherently flame-retardant properties.

[0019] This invention uses inherently flame-retardant chemical fibers as weaving raw materials, enabling the fabric to obtain stable flame-retardant properties without the need for flame-retardant coatings or flame-retardant finishing. This avoids the blockage or filling of the fabric's pore structure by post-finishing processes, allowing the fabric to maintain its porous structure while also possessing good sound absorption and flame-retardant properties.

[0020] Preferably, the honeycomb tissue has a tissue cycle number of 8 to 16, a float length range of 6 to 12, and a cell size of 3 to 10 mm.

[0021] Preferably, the honeycomb structure is formed by variations based on 1 / 2 twill or 1 / 3 twill.

[0022] Preferably, the periodic strip-shaped hollow layer includes, in each cycle, a non-connected region consisting of n consecutive non-connected tissue cycles and a connected region consisting of m consecutive connected tissue cycles, wherein n is 4 to 12 and m is 1 to 3.

[0023] Preferably, the distribution density of the joints in the plane of the multilayer woven fabric is 3 to 8 per square centimeter.

[0024] Preferably, the thickness of the multilayer woven fabric is 1.5 to 6 mm, more preferably 1.5 to 4 mm; and the areal density is 200 to 450 g / m².

[0025] In a second aspect, this invention provides a method for preparing a sound-absorbing and flame-retardant multilayer woven fabric, comprising the following steps: S1. Raw material preparation; Three different specifications of flame-retardant polyester fiber yarn were selected as weaving raw materials. The finest specification of flame-retardant polyester fiber yarn was used to weave a honeycomb structure formed by the variation of the twill structure as the outer layer. The medium specification of flame-retardant polyester fiber yarn was used to weave a plain weave structure as the middle layer. The coarsest specification of flame-retardant polyester fiber yarn was used to weave a plain weave structure as the inner layer. S2, Weaving on a loom; The outer, middle, and inner layers of fabric are connected by a bottom-to-top joint method, so that the three layers of fabric form an integrated woven structure in the same weaving process; the weaving process controls the interlayer areas to not set joints, so that the three layers of fabric form a strip-shaped hollow layer structure; the surface of the prepared fabric forms a regular concave-convex cell structure. S3. Post-processing; The woven fabric is then subjected to a shaping process to improve the dimensional stability and structural integrity of the fabric, resulting in the sound-absorbing and flame-retardant three-layer woven curtain fabric.

[0026] Preferably, in the raw material preparation in S1, the yarn counts of the three different specifications of flame-retardant polyester fiber yarns are 21s, 16s, and 12s, respectively, so that the fabric thickness direction forms a multi-layer woven structure with different structural densities.

[0027] Preferably, the weaving process in S2 is as follows: the three-layer fabric structure is woven on a weaving machine by threading heddles, reeds, and pattern boards, so that the outer layer, middle layer, and inner layer form an integrated three-layer woven structure through preset joints.

[0028] In a third aspect, this invention proposes the application of a sound-absorbing and flame-retardant multilayer woven fabric in interior decorative fabrics, using the sound-absorbing and flame-retardant multilayer woven fabric as the base fabric to prepare a sound-absorbing and flame-retardant curtain fabric.

[0029] This invention achieves synergistic control of the fabric's surface morphology, internal porous structure, and interlayer hollow structure through woven structure design. While maintaining the softness, drape, and decorative properties of the curtain fabric, it also improves the fabric's sound absorption performance and endows it with stable flame retardant properties.

[0030] Compared with the prior art, the beneficial effects of the present invention are: (1) This invention forms a multi-level sound energy regulation structure to improve the overall sound absorption performance of the fabric. This invention forms a multi-level sound energy regulation structure in the fabric thickness direction through the synergistic design of a honeycomb surface structure, a three-layer woven structure, and a periodic hollow layer structure. The honeycomb surface layer improves the sound wave incident conditions and enhances surface scattering, making it easier for sound waves to enter the fabric interior; the three-layer woven structure creates a multi-layered porous structure that gradually changes from the surface to the inside of the fabric; the periodic strip-shaped hollow layer provides additional air space and extends the sound wave propagation path. Through the synergistic effect of the above structures, the overall sound absorption performance of the fabric can be effectively improved and the effective sound absorption frequency band can be broadened.

[0031] (2) The honeycomb surface structure in this invention has good structural controllability. The concave and convex cell interfaces formed by the honeycomb structure can increase the effective specific surface area of ​​the fabric surface and enhance the sound wave scattering effect. At the same time, structural parameters such as honeycomb structure cycle and warp and weft density can control cell size, porosity and average pore size, thereby realizing the structural control of the sound absorption performance of the fabric.

[0032] (3) The hollow layer structure in this invention is beneficial to improving the sound absorption performance in the mid-to-low frequency range. By controlling the periodic distribution of the indirect nodes between the layers, a strip-shaped hollow layer is formed between the three woven structures, so that a structural region with air space is formed inside the fabric, thereby extending the propagation path of sound waves inside the fabric and enhancing the sound energy dissipation effect, which is beneficial to improving the sound absorption performance of the fabric in the mid-to-low frequency range.

[0033] (4) The flame-retardant fiber material in this invention helps to maintain the integrity of the porous structure of the fabric. This invention uses inherently flame-retardant chemical fibers as weaving raw materials, so that the fabric can obtain stable flame-retardant properties without flame-retardant coatings or flame-retardant finishing, thereby avoiding the blocking or filling effect of traditional flame-retardant finishing on the internal structure of the fabric, and enabling the porous structure and hollow layer structure of the fabric to fully exert their sound absorption function.

[0034] (5) The present invention takes into account both structural stability and process feasibility. Based on the woven structure design, the present invention forms a stable three-layer structure system through the interlacing of warp and weft yarns. While achieving sound absorption and flame retardant functions, it can still maintain the softness, drape and decorative appearance required for curtain fabrics. It can be woven using ordinary sample looms or conventional weaving equipment, and has good process feasibility and application prospects. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the weave structure and weaving process of the three-layer woven fabric in this invention. Figure 1 (a) is a woven fabric with a honeycomb weave structure based on a 1 / 2 right-hand oblique base. Figure 1 (b) is a woven fabric with a honeycomb weave structure based on a 1 / 3 right-hand oblique base. Figure 2 This is a schematic diagram of the sound absorption mechanism of the three-layer woven structure in this invention. Figure 2 (a) is a three-layer woven structure without a hollow layer. Figure 2 (b) is a three-layer woven structure with a hollow layer). Figure 3 This is a schematic diagram of the fabric microstructure and multilayer pore distribution in this invention; Figure 4 This is a schematic diagram of the multilayer pore distribution and porosity in this invention. Figure 4 (a) is a woven structure with an upper layer porosity of 68.67%. Figure 4(b) is a woven structure with a middle layer porosity of 43.57%. Figure 4 (c) is a woven structure with a lower porosity of 24.78%). Figure 5 This is a cross-sectional topography of the fabric in the thickness direction in this invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: The preparation method of the sound-absorbing and flame-retardant three-layer woven fabric includes the following steps: (1) Raw material preparation Three types of flame-retardant polyester yarns with different linear densities were selected as weaving materials, among which: The first layer uses 21s flame-retardant polyester yarn; The second layer uses 16s flame-retardant polyester yarn; The third layer uses 12s flame-retardant polyester yarn.

[0038] Flame-retardant polyester yarn is a phosphorus-containing flame-retardant polyester fiber yarn. The flame-retardant components in the yarn are introduced into the polyester molecular structure through copolymerization, giving the yarn inherent flame-retardant properties and good durable flame-retardant characteristics.

[0039] (2) Organizational structure design The three-layer fabric structure is designed as follows: The first layer, as the surface layer of the fabric, uses a honeycomb structure formed by variations based on 1 / 2 twill. Both the second and third layers use a plain weave.

[0040] The honeycomb weave creates a regular, undulating structure on the fabric surface, which helps increase the fabric's surface area and improves sound wave incidence conditions. Because the three layers of fabric are woven with yarns of different linear densities, a multi-layered woven structure with gradually changing structural density is formed along the fabric's thickness direction, such as... Figure 1 As shown in (a).

[0041] (3) Connection method design The three layers of fabric are connected by a bottom-to-top joint.

[0042] During the weaving process, a strip-shaped hollow layer is formed in the fabric structure through an incomplete splicing method. That is, no splicing points are set in the first 8 consecutive weave cycles, so that a hollow structure is formed between the three layers of fabric. A splicing point is set only at the 9th weave cycle position, so that the three layers of fabric are reconnected. The distribution density of splicing points in the fabric is 8 splicing points per weave cycle (4 at the bottom and 4 at the top). After the splicing is completed, the above structural cycle is repeated, thus forming a three-layer woven structure with a periodic strip-shaped hollow layer.

[0043] (4) Weaving process Based on the designed three-layer weave structure diagram, the heddles, reeds, and weave patterns are configured, and the weaving is carried out on a weaving machine. Preferably, an 8-page heddle frame is used during the weaving process, the reed number is selected as No. 40, and the weaving is carried out using a one-reed-two-insertion method.

[0044] (5) Post-processing The woven fabric is then subjected to a shaping process to improve the dimensional stability and structural integrity of the fabric, thereby obtaining a sound-absorbing and flame-retardant three-layer woven fabric.

[0045] (6) Structural effect description Through the above structural design, the honeycomb weave surface layer enhances the surface texture of the fabric and improves the conditions for sound wave incidence, making it easier for sound waves to penetrate the fabric interior. The three-layer woven structure creates a multi-layered, porous structure within the fabric, which facilitates the propagation and gradual dissipation of sound waves within the fabric, thereby improving the fabric's sound absorption performance. Simultaneously, because all three layers are woven with flame-retardant yarns, the fabric as a whole possesses stable flame-retardant properties.

[0046] Furthermore, through the above structural design, a strip-shaped hollow layer structure is formed inside the three-layer fabric. This hollow structure can form an air cavity inside the fabric. When sound waves enter the fabric, they can undergo multiple reflections and resonances in the cavity, thereby extending the sound wave propagation path and enhancing sound energy dissipation, which is beneficial to further improving the sound absorption performance of the fabric. Figure 2 This is a schematic diagram illustrating the sound absorption mechanism of the three-layer woven structure of the present invention. The surface layer of the fabric has a honeycomb structure with an uneven surface morphology, which facilitates the entry of incident sound waves into the fabric interior. The three layers of fabric use yarns of different linear densities to form a multi-layer woven structure. The hollow structure can create air cavities within the fabric. The dashed circles in the figure represent the equivalent pore size inside the fabric. Sound waves undergo multiple scattering, reflection, and viscous friction dissipation within the fabric, thereby achieving gradual attenuation of sound energy.

[0047] See Figure 3-5 The sound-absorbing and flame-retardant three-layer woven fabric prepared in this embodiment has a honeycomb structure on the surface and uses yarns of different linear densities to form a multi-layer woven structure. The hollow structure can form an air cavity inside the fabric. Figure 3This is a schematic diagram of the microstructure and multilayer pore distribution of the woven structure of the present invention. T1 represents the surface pores, T2 represents the middle pores, and T3 represents the bottom pores. The blue dashed area represents the pore structure that is not directly observed from the front. This part of the pores can be observed from the reverse side of the fabric. Figure 4 The red area represents the pore distribution characteristics of the woven structure of the present invention at different layers, with the red area being the pore region identified through image processing. Figure 5 The image shows a cross-sectional view of the woven structure of the present invention in the thickness direction. The fabric consists of a surface layer, a hollow structure layer, and an inner layer. The hollow structure layer contains multiple air cavities (circled in red). This structure helps to enhance the multiple reflections and dissipation of sound waves inside the fabric.

[0048] Comparative Example 1: The preparation method of the sound-absorbing and flame-retardant three-layer woven fabric includes the following steps: (1) Raw material preparation Consistent with Example 1.

[0049] (2) Organizational structure design The three-layer fabric structure is designed as follows: The first layer, as the surface layer of the fabric, uses a honeycomb structure formed by variations based on 1 / 2 twill. Both the second and third layers use a plain weave.

[0050] The honeycomb weave creates a regular, undulating structure on the fabric surface, which helps increase the fabric's surface area and improves sound wave incidence conditions. Because the three layers of fabric are woven with yarns of different linear densities, a multi-layered woven structure with gradually changing structural density is formed along the fabric's thickness direction, such as... Figure 1 As shown in (a).

[0051] (3) Connection method design The three layers of fabric are connected by a bottom-to-top splicing method. The distribution density of splicing points in the fabric is 4 splicing points per weave cycle, approximately 36 splicing points per square centimeter, thus forming a stable integrated three-layer woven structure.

[0052] (4) Weaving process Based on the designed three-layer weave structure diagram, the heddles, reeds, and weave patterns are configured, and the weaving is carried out on the loom. During the weaving process, an 8-page heddle frame is used, with a reed size of 40, and a two-in-one-reed weaving method is employed.

[0053] (5) Post-processing The woven fabric is then subjected to a shaping process to improve the dimensional stability and structural integrity of the fabric, thereby obtaining a sound-absorbing and flame-retardant three-layer woven fabric.

[0054] (6) Structural effect description Through the above structural design, the honeycomb weave surface layer enhances the surface texture of the fabric and improves the conditions for sound wave incidence, making it easier for sound waves to penetrate the fabric interior. The three-layer woven structure creates a multi-layered, porous structure within the fabric, which facilitates the propagation and gradual dissipation of sound waves within the fabric, thereby improving the fabric's sound absorption performance. Simultaneously, because all three layers are woven with flame-retardant yarns, the fabric as a whole possesses stable flame-retardant properties.

[0055] Comparative Example 2: The preparation method of the sound-absorbing and flame-retardant three-layer woven fabric includes the following steps: (1) Raw material preparation Consistent with Example 1.

[0056] (2) Organizational structure design The three-layer fabric structure is designed as follows: The first layer, as the surface layer of the fabric, uses a honeycomb structure formed by variations based on 1 / 3 twill. Both the second and third layers use a plain weave structure, such as Figure 1 As shown in (b).

[0057] (3) Connection method design The three layers of fabric are connected by a bottom-to-top splicing method. The distribution density of splicing points in the fabric is 4 splicing points per tissue cycle, approximately 36 splicing points per square centimeter.

[0058] (4) Weaving process Based on the designed three-layer weave structure diagram, the heddles, reeds, and weave patterns are configured, and the weaving is carried out on the loom. During the weaving process, a 9-page heddle frame is used, and a No. 40 reed is selected. The weaving method is a one-reed-two-insertion technique.

[0059] (5) Post-processing The woven fabric is then subjected to a shaping process to improve the dimensional stability and structural integrity of the fabric, thereby obtaining a sound-absorbing and flame-retardant three-layer woven fabric.

[0060] (6) Structural effect description Due to the different cell structures of honeycomb tissues, the honeycomb cell area in Comparative Example 1 is smaller and the porosity is more reasonable, so its sound absorption performance is better than that of Comparative Example 2.

[0061] Comparative Example 3: The preparation method of the sound-absorbing and flame-retardant three-layer woven fabric includes the following steps: (1) Raw material preparation Consistent with Example 1.

[0062] (2) Organizational structure design The three-layer fabric structure is designed as follows: The first, second, and third layers all use a plain weave.

[0063] (3) Connection method design During the weaving process, a strip-shaped hollow layer is formed in the fabric structure through an incomplete splicing method. That is, no splicing points are set in the first 8 consecutive weave cycles, so that a hollow structure is formed between the three layers of fabric. A splicing point is set only at the 9th weave cycle position, so that the three layers of fabric are reconnected. The distribution density of splicing points in the fabric is 8 splicing points per weave cycle (4 at the bottom and 4 at the top). After the splicing is completed, the above structural cycle is repeated, thus forming a three-layer woven structure with a periodic strip-shaped hollow layer.

[0064] (4) Weaving and finishing Based on the designed structure, the heddles, reeds, and pattern boards are configured, and the fabric is woven on a machine. The woven fabric is then set to obtain a three-layer woven fabric.

[0065] (5) Structural effect description Compared with Example 1, the difference of Comparative Example 3 is that the surface layer does not use a honeycomb structure, but a conventional plain weave structure. Therefore, the overall surface of the fabric is relatively flat and lacks the uneven structure formed by the honeycomb structure.

[0066] The tissue structure and connection method of Example 1 and Comparative Examples 1-3 are shown in Table 1.

[0067] Table 1. Structure of the sound-absorbing and flame-retardant three-layer woven fabrics of Example 1 and Comparative Examples 1-3

[0068] Compared with Example 1, Comparative Examples 1-2 did not have a strip-shaped hollow layer designed. The strip-shaped hollow layer caused the sound waves to be scattered, reflected, and dissipated by viscous friction multiple times inside the fabric, thus achieving a gradual attenuation of sound energy. Therefore, the sound wave attenuation effect inside the fabric was poor, and the overall sound absorption performance of Comparative Examples 1-2 was lower than that of the honeycomb structure fabric described in Example 1.

[0069] Compared with Example 1, Comparative Example 3 has a flat plain weave structure on the surface, which makes the fabric surface less able to scatter sound waves and the efficiency of sound waves entering the fabric is relatively low. Therefore, its overall sound absorption performance is lower than that of the honeycomb weave structure fabric described in Example 1.

[0070] The above description is only for the purpose of helping to understand the method and core essence of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, any equivalent substitutions or modifications made to the technical solution and inventive concept disclosed in the present invention within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A sound-absorbing and flame-retardant multilayer woven fabric, characterized in that, The multi-layer woven fabric includes a top layer, a middle layer, and an inner layer from top to bottom, and the top layer, middle layer, and inner layer are integrally connected by a bottom-to-top connection method; The surface layer adopts a honeycomb structure formed by variations of the twill weave, and the honeycomb structure has a regular concave-convex cell structure; The middle and inner layers are constructed with a plain weave. The interlayer nodes between the surface layer, the middle layer and the inner layer are periodically distributed along the longitudinal or latitudinal direction. Each period includes several consecutive tissue cycles without nodes and at least one tissue cycle with nodes, forming a periodic strip-shaped hollow layer between the three layers. The periodic strip-shaped hollow layer is located in the cell interweaving region of the honeycomb tissue.

2. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 1, characterized in that, The outer, middle, and inner layers are all woven from flame-retardant chemical fiber yarns, and the linear density of the yarns used in the outer, middle, and inner layers increases sequentially.

3. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 2, characterized in that, The outer layer, middle layer, and inner layer are all woven from flame-retardant polyester fiber yarns; the yarn count of the outer layer is 18s to 24s, the yarn count of the middle layer is 14s to 18s, and the yarn count of the inner layer is 10s to 14s, with corresponding yarn linear densities of 25 to 33 tex, 33 to 42 tex, and 42 to 60 tex, respectively.

4. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 3, characterized in that, The flame-retardant polyester fiber yarn is a phosphorus-containing flame-retardant polyester fiber yarn with a phosphorus content of 6500-6800 ppm.

5. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 1, characterized in that, The honeycomb tissue has a tissue cycle number of 8 to 16, a float length range of 6 to 12, and a cell size of 3 to 10 mm.

6. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 1, characterized in that, The periodic strip-shaped hollow layer includes, in each cycle, a non-connected region consisting of n consecutive non-connected tissue cycles and a connected region consisting of m consecutive connected tissue cycles, where n is 4 to 12 and m is 1 to 3.

7. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 6, characterized in that, The distribution density of the joints in the plane of the multilayer woven fabric is 3 to 8 per square centimeter.

8. The sound-absorbing and flame-retardant multilayer woven fabric according to claim 1, characterized in that, The thickness of the multilayer woven fabric is 1.5–6 mm, and the areal density is 200–450 g / m².

9. The method for preparing sound-absorbing and flame-retardant multilayer woven fabric as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Raw material preparation; Three different specifications of flame-retardant polyester fiber yarn were selected as weaving raw materials. The finest specification of flame-retardant polyester fiber yarn was used to weave a honeycomb structure formed by the variation of the twill structure as the outer layer. The medium specification of flame-retardant polyester fiber yarn was used to weave a plain weave structure as the middle layer. The coarsest specification of flame-retardant polyester fiber yarn was used to weave a plain weave structure as the inner layer. S2, Weaving on a loom; The three layers of fabric—outer layer, middle layer, and inner layer—are connected by a bottom-to-top joint method, so that the three layers of fabric form an integrated woven structure in the same weaving process. During the weaving process, no joints are set in certain areas between the layers, so that a strip-shaped hollow layer structure is formed between the three layers of fabric; The prepared fabric surface forms a regular, uneven cellular structure; S3. Post-processing; The woven fabric undergoes a shaping process.

10. The application of the sound-absorbing and flame-retardant multilayer woven fabric as described in any one of claims 1-8 in interior decorative fabrics, characterized in that, Sound-absorbing and flame-retardant curtain fabrics were prepared using sound-absorbing and flame-retardant multilayer woven fabrics as the base fabric.

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