Shangri-La curtain fabric made of natural material and preparation method of Shangri-La curtain fabric

Abstract

The invention discloses a Shangri-La curtain fabric made of natural materials and a preparation method of the Shangri-La curtain fabric, and particularly relates to the field of Shangri-La curtains. The natural material fabric is obtained by weaving one of the following five fiber raw materials in percentage by weight: a fiber raw material I: 70% of paper fiber and 30% of Bengal hemp fiber; a fiber raw material II: 50% of linen fiber and 50% of Manila hemp fiber; the third fiber raw material comprises 80% of linen fiber and 20% of ramie fiber and polyester cotton blended fiber; a fourth fiber raw material: 70% of paper fiber and 30% of ramie fiber; and a fiber raw material V: 100% of rose-bengal jute fibers. Sacrificial filaments with a shape memory effect or a strain hardening effect are introduced into a fiber system of a natural material blade strip, the sacrificial filaments, ground yarns and surface yarns form an integrated laminated structure, crack propagation and interface stripping are actively inhibited in the service process, and therefore the anti-fatigue capacity of the structure and the interface is improved.

Description

Technical Field

[0001] This invention relates to the field of Shangri-La curtain technology, and more specifically, to a Shangri-La curtain fabric made of natural materials and its preparation method. Background Technology

[0002] Shangri-La blinds are a type of light-controlling blind. These blinds consist of a pair of parallel panels (such as a base layer and a face layer) with multiple slats. When the blinds are closed, the slats are essentially parallel to the paired panels, while when open, the slats extend to a position essentially perpendicular to the paired panels. In actual production, the slats, base layer, and face layer are integrated into a single unit through weaving or other processes. When fully open, the slats are perpendicular to the two layers of sheer fabric. Adjusting the height of one side of the sheer fabric reduces the amount of light entering the blinds. When the two layers of sheer fabric are pressed together, all light is blocked. Further adjustment of the blind height causes it to roll up along the top axis, thus achieving excellent light control.

[0003] There are two main approaches to manufacturing Shangri-La blind fabrics: one is to cut the warp threads section by section after multi-weft rapier weaving to form an opening structure. This method creates continuous gaps and free fiber ends at the cut warp threads after weaving. During the high-frequency bending of the slats during opening, closing, and winding, stress concentration easily occurs at the gaps. Accompanied by fiber pulling and inter-yarn wear, cracks are generated and propagate longitudinally along the slats, leading to a rapid decrease in fatigue life. The other approach involves arranging nonwoven strips parallel between the base yarn and the face yarn and bonding them with hot melt adhesive on both sides. The nonwoven fabric itself has low in-plane tensile and right-angle tear strength, and there is a mismatch in modulus and thickness between it and the base fabric. Under cyclic loads, the interface is subjected to alternating peeling and shearing, resulting in micro-debonding. Moisture and temperature fluctuations further aggravate the creep and embrittlement of the adhesive layer, which then evolves into delamination, edge lifting, and strip breakage. Therefore, although both processes can achieve the opening shape, the common bottleneck lies in the insufficient fatigue resistance of the structure and interface during the service life, and the core problem is "poor durability". Summary of the Invention

[0004] To overcome the aforementioned deficiencies of the prior art, embodiments of the present invention provide a Shangri-La curtain fabric made of natural materials and its preparation method. By introducing sacrificial yarns with shape memory effect or strain hardening effect into the fiber system of natural material blade strips, and forming an integrated composite structure with the base yarn and face yarn, the fabric actively inhibits crack propagation and interface peeling during service, thereby improving the fatigue resistance of the structure and interface, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a Shangri-La curtain fabric made of natural materials, comprising:

[0006] The Shangri-La curtain fabric comprises leaf strips, a base gauze, and a face gauze made of natural materials, which are woven from one of the following five fiber raw materials by weight percentage:

[0007] Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber;

[0008] Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber;

[0009] Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber;

[0010] Fiber raw material four: 70% paper fiber and 30% ramie fiber;

[0011] Fiber raw material five: 100% Bengal jute fiber;

[0012] The warp and weft directions of the blade strip are interchanged so that the warp direction during weaving is used as the transverse direction of the blade in the finished product. The two sides of the blade strip are coated with hot melt adhesive with a width of not less than 1.5mm and bonded to the base yarn and face yarn respectively.

[0013] In a preferred embodiment, the fiber system of the blade strip contains 1%-5% by mass of shape memory sacrificial yarns along the blade width direction. The linear density of the sacrificial yarns is 0.8-1.7 dtex, and the spacing between them is 1-3 yarns / cm. The sacrificial yarns generate a shrinkage strain of not less than 3% along the axial direction when the temperature is 40-65℃ or the relative humidity is not less than 60%. When cracks appear in the right-angle direction of the blade strip, a pulling force is applied to reduce the crack opening to less than 0.2 mm and maintain the shape.

[0014] In a preferred embodiment, the fiber system of the blade strip contains strain-hardening sacrificial fibers with a mass fraction of 2%-6% along the blade width direction. The sacrificial fibers are a composite structure of natural fiber shells encapsulating ruptureable capsules. The capsules contain a coordination system of plant polyphenols and trivalent metal ions or a bio-based curable resin. When the sacrificial fibers are tensilely broken in a right-angle direction, they release the contents of the capsules and form a hardened bridging layer at the crack edge, thereby increasing the energy storage modulus of the triggering region by no less than 200% and limiting the crack propagation rate to below 0.5 mm / s.

[0015] A method for preparing a Shangri-La curtain fabric made of natural materials, comprising:

[0016] Step 1: Preparation of the roll material:

[0017] Cut the roll of natural material fabric into a standard size of 60cm in width along the weft direction;

[0018] Replace the weft direction of the cut natural material fabric with the warp direction, and splice the short side together with paper tape with a width of not less than 5cm.

[0019] At the joint, a zigzag sewing machine is used to sew along the center line of the paper tape to reinforce it, forming a reinforced roll.

[0020] The reinforced roll material is cut into strips with a width of 8.6cm using a slitting machine;

[0021] Step 2: Applying glue, stretching, and pressing to shape:

[0022] Apply hot melt adhesive with a width of not less than 1.5mm to both sides of the fabric strip, with the hot melt adhesive on both sides located on the upper and lower sides of the fabric strip respectively.

[0023] Cut the fabric strips to a length equal to 3.25m in width to the base yarn or face yarn;

[0024] Fabric strips are placed tightly on the base yarn in sequence, and then the face yarn is covered on top to form an overlay structure consisting of the base yarn, fabric strips and face yarn.

[0025] The overlapping structure is placed in a heat press device and heat-pressed at a temperature of 135℃-145℃ for 4-6 seconds, so that one side of the fabric strip is bonded to the base yarn and the other side is bonded to the face yarn, thus obtaining the Shangri-La curtain fabric.

[0026] In a preferred embodiment, during the weaving process of the natural material fabric in step one, shape memory sacrificial yarns with a mass fraction of 1% to 5%, a linear density of 0.8 to 1.7 dtex, and an arrangement spacing of 1 to 3 yarns / cm are pre-placed along the width direction of the leaf strip. After weaving, the sacrificial yarns, together with the natural fibers, enter the subsequent weft direction cutting, replacement, splicing, sewing reinforcement, and slitting steps. During the use of the finished Shangri-La curtain fabric, at a temperature of 40°C to 65°C or a relative humidity of not less than 60%, a shrinkage strain of not less than 3% is generated along the axial direction to apply a pulling force and maintain the shape when a right-angle crack appears.

[0027] In a preferred embodiment, during the weaving process of the natural material fabric in step one, a strain-hardening sacrificial yarn with a mass fraction of 2% to 6% is pre-placed along the width direction of the blade strip. The sacrificial yarn is a composite structure in which a natural fiber shell is covered with a ruptureable capsule. The capsule contains a plant polyphenol and trivalent metal ion coordination system or a bio-based curable resin. After weaving, the sacrificial yarn enters the subsequent weft direction cutting, replacement, splicing, sewing reinforcement and slitting steps together with the natural fiber. When the Shangri-La curtain fabric is used and breaks under tension in the right-angle direction, the contents of the capsule are released, forming a hardened bridging layer at the crack edge, increasing the energy storage modulus of the triggering area by no less than 200%, and limiting the crack propagation rate to below 0.5 mm / s.

[0028] In a preferred embodiment, the natural material fabric is woven from one of five fiber raw materials in weight percentages:

[0029] Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber;

[0030] Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber;

[0031] Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber;

[0032] Fiber raw material four: 70% paper fiber and 30% ramie fiber;

[0033] Fiber raw material five: 100% Bengal jute fiber.

[0034] The technical effects and advantages of this invention are as follows:

[0035] 1. By replacing the weft direction of the natural material fabric with the warp direction, the fibers with higher longitudinal strength are arranged in the transverse direction of the finished blade strip, which improves the crack resistance of the blade in the right-angle direction and solves the core problem of transverse cracking.

[0036] 2. Use paper tape with a width of not less than 5cm to splice the short side, and use zigzag sewing to reinforce the splicing point to form a stable splicing connection interface, reducing the risk of loosening and tearing of fibers at the seam during cutting and subsequent processing;

[0037] 3. Introduce shape memory sacrificial wires in the width direction of the blade strips to achieve shrinkage through temperature and humidity triggering. When cracks appear, they provide active pulling force to control the crack opening to below 0.2mm and prevent damage from spreading.

[0038] 4. Introducing strain-hardening sacrificial wire, utilizing the natural fiber shell and ruptureable capsule structure, releases the curing medium upon tensile fracture, forming a hardened bridging layer, which improves the local storage modulus and significantly inhibits the crack propagation rate.

[0039] 5. By applying hot melt adhesive with a width of not less than 1.5mm on both sides and bonding it to the base yarn and face yarn simultaneously under heat pressing conditions, an integrated composite structure is formed, which improves the structural stability and dimensional retention of the blade strip during use. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the joint structure of the present invention.

[0041] The attached diagram is labeled as follows: 1 represents natural fabric; 2 represents natural fabric; 3 represents washi tape; 4 represents the seam of a zigzag sewing machine; 5 represents the seam of the fabric. Detailed Implementation

[0042] 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.

[0043] Refer to the instruction manual appendix Figure 1 An embodiment of the present invention provides a Shangri-La curtain fabric made of natural materials, comprising:

[0044] The Shangri-La curtain fabric comprises leaf strips, a base gauze, and a face gauze made of natural materials, which are woven from one of the following five fiber raw materials by weight percentage:

[0045] Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber;

[0046] Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber;

[0047] Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber;

[0048] Fiber raw material four: 70% paper fiber and 30% ramie fiber;

[0049] Fiber raw material five: 100% Bengal jute fiber;

[0050] The warp and weft directions of the blade strip are interchanged so that the warp direction during weaving is used as the transverse direction of the blade in the finished product. The two sides of the blade strip are coated with hot melt adhesive with a width of not less than 1.5mm and bonded to the base yarn and face yarn respectively.

[0051] The fiber system of the blade strip contains 1%-5% by mass of shape memory sacrificial yarns along the width direction of the blade. The linear density of the sacrificial yarns is 0.8-1.7 dtex, and the spacing between them is 1-3 yarns / cm. When the temperature is 40-65℃ or the relative humidity is not lower than 60%, the sacrificial yarns generate a shrinkage strain of not less than 3% along the axial direction. When cracks appear in the right-angle direction of the blade strip, a pulling force is applied to reduce the crack opening to below 0.2mm and maintain the shape.

[0052] The fiber system of the blade strip contains strain-hardening sacrificial fibers with a mass fraction of 2%-6% along the blade width direction. The sacrificial fibers are a composite structure in which a natural fiber shell covers a ruptureable capsule. The capsule contains a coordination system of plant polyphenols and trivalent metal ions or a bio-based curable resin. When the sacrificial fibers are tensilely broken in a right-angle direction, they release the contents of the capsule and form a hardened bridging layer at the crack edge, which increases the energy storage modulus of the triggering region by no less than 200% and limits the crack propagation rate to below 0.5 mm / s.

[0053] A method for preparing a Shangri-La curtain fabric made of natural materials, comprising:

[0054] Step 1: Preparation of the roll material:

[0055] Cut the roll of natural material fabric into a standard size of 60cm in width along the weft direction;

[0056] Replace the weft direction of the cut natural material fabric with the warp direction, and splice the short side together with paper tape with a width of not less than 5cm.

[0057] At the joint, a zigzag sewing machine is used to sew along the center line of the paper tape to reinforce it, forming a reinforced roll.

[0058] The reinforced roll material is cut into strips with a width of 8.6cm using a slitting machine;

[0059] Step 2: Applying glue, stretching, and pressing to shape:

[0060] Apply hot melt adhesive with a width of not less than 1.5mm to both sides of the fabric strip, with the hot melt adhesive on both sides located on the upper and lower sides of the fabric strip respectively.

[0061] Cut the fabric strips to a length equal to 3.25m in width to the base yarn or face yarn;

[0062] Fabric strips are placed tightly on the base yarn in sequence, and then the face yarn is covered on top to form an overlay structure consisting of the base yarn, fabric strips and face yarn.

[0063] The overlapping structure is placed in a heat press device and heat-pressed at a temperature of 135℃-145℃ for 4-6 seconds, so that one side of the fabric strip is bonded to the base yarn and the other side is bonded to the face yarn, thus obtaining the Shangri-La curtain fabric.

[0064] Furthermore, during the weaving process of the natural material fabric mentioned in step one, shape memory sacrificial yarns with a mass fraction of 1% to 5%, a linear density of 0.8 to 1.7 dtex, and an arrangement spacing of 1 to 3 yarns / cm are pre-placed along the width direction of the leaf strips. After weaving, the sacrificial yarns, together with the natural fibers, enter the subsequent weft direction cutting, replacement, splicing, sewing reinforcement, and slitting steps. During the use of the finished Shangri-La curtain fabric, at a temperature of 40℃ to 65℃ or a relative humidity of not less than 60%, a shrinkage strain of not less than 3% is generated along the axial direction to apply a pulling force and maintain the shape when a right-angle crack appears.

[0065] Furthermore, during the weaving process of the natural material fabric mentioned in step one, a strain-hardening sacrificial yarn with a mass fraction of 2% to 6% is pre-placed along the width direction of the leaf strip. The sacrificial yarn is a composite structure in which a natural fiber shell is covered with a ruptureable capsule. The capsule contains a plant polyphenol and trivalent metal ion coordination system or a bio-based curable resin. After weaving, the sacrificial yarn enters the subsequent weft direction cutting, replacement, splicing, sewing reinforcement and slitting steps together with the natural fiber. When the Shangri-La curtain fabric is used and breaks under tension in the right-angle direction, the contents of the capsule are released, forming a hardened bridging layer at the crack edge, which increases the energy storage modulus of the triggering area by no less than 200% and limits the crack propagation rate to below 0.5 mm / s.

[0066] The natural material fabric is woven from one of the following five fiber raw materials by weight percentage:

[0067] Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber;

[0068] Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber;

[0069] Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber;

[0070] Fiber raw material four: 70% paper fiber and 30% ramie fiber;

[0071] Fiber raw material five: 100% Bengal jute fiber.

[0072] Table A-1: ​​Shape Memory Sacrificial Wire - Material Parameters and Crack Closure Effect

[0073]

[0074] Table A-2: Shape Memory Sacrificial Fibers - Improved Shrinkage Strain and Tear Performance

[0075] Table B-1: Strain-hardening sacrificial wire - material parameters and capsule release reaction

[0076]

[0077] Table B-2: Strain-hardening sacrificial wire-hardening bridging effect and crack propagation control

[0078]

[0079] It is important to clarify that the combination of shape memory sacrificial wires and strain hardening sacrificial wires in the same blade strip system is essentially based on the complementarity of material response mechanisms. When the temperature or humidity reaches the triggering conditions, the shape memory sacrificial wire generates controllable shrinkage strain along the axial direction, which can form an active closing force in the early stage of cracking, limiting the crack opening and maintaining structural continuity. This process is a reversible physical deformation regulation, mainly acting on crack width control in the early stage of damage. On the other hand, when the crack continues to expand and causes the sacrificial wire to break, the strain hardening sacrificial wire releases the reactants in the capsule, forming a high-modulus bridging layer in situ at the crack edge, achieving secondary reinforcement of the structure. This process is an irreversible chemical hardening reaction, mainly acting on inhibiting the crack propagation rate and improving local rigidity. The two types of wires have different triggering conditions and staggered action times, respectively responsible for early closure and late hardening, and do not conflict in function. Instead, they form a continuous damage control chain.

[0080] From the perspective of material selection principles, shape memory sacrificial yarns typically use fibers with phase change or reversible molecular chain arrangement, such as heat-shrinkable polyester or moisture-sensitive nylon, whose triggered strain can be rapidly recovered without changing the surrounding fiber structure. The core of strain-hardening sacrificial yarns is a composite structure of a natural fiber shell and an inner reactive capsule. The shell ensures compatibility with the main fabric and adaptability to textile processing, while the polyphenol-metal coordination system or bio-based curing resin released by the capsule rupture can quickly cross-link on the fiber surface to form a high-modulus layer. This combination allows the former to play a tightening role under normal environmental fluctuations, preventing crack deterioration, while the latter provides irreversible structural curing at the moment of fracture caused by extreme load or impact, ensuring that Shangri-La blinds have both crack resistance and life extension effects in long-term use. Both types of yarns can be directly embedded in the weaving process without additional processing steps.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. 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 Shangri-La curtain fabric made of natural materials, characterized in that, include: The Shangri-La curtain fabric comprises leaf strips, a base gauze, and a face gauze made of natural materials, which are woven from one of the following five fiber raw materials by weight percentage: Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber; Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber; Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber; Fiber raw material four: 70% paper fiber and 30% ramie fiber; Fiber raw material five: 100% Bengal jute fiber; The warp and weft directions of the blade strip are interchanged so that the warp direction during weaving is used as the transverse direction of the blade in the finished product. The two sides of the blade strip are coated with hot melt adhesive with a width of not less than 1.5mm and bonded to the base yarn and face yarn respectively.

2. The Shangri-La curtain fabric made of natural materials according to claim 1, characterized in that: The fiber system of the blade strip contains 1%-5% by mass of shape memory sacrificial yarns along the width direction of the blade. The linear density of the sacrificial yarns is 0.8-1.7 dtex, and the spacing between them is 1-3 yarns / cm. When the temperature is 40-65℃ or the relative humidity is not lower than 60%, the sacrificial yarns generate a shrinkage strain of not less than 3% along the axial direction. When cracks appear in the right-angle direction of the blade strip, a pulling force is applied to reduce the crack opening to below 0.2mm and maintain the shape.

3. The Shangri-La curtain fabric made of natural materials according to claim 1, characterized in that: The fiber system of the blade strip contains strain-hardening sacrificial fibers with a mass fraction of 2%-6% along the blade width direction. The sacrificial fibers are composite structures of natural fiber shells encapsulating capsules. The capsules contain plant polyphenols and trivalent metal ion coordination systems or bio-based curable resins. When the sacrificial fibers are tensilely broken in a right-angle direction, they release the contents of the capsules and form a hardened bridging layer at the crack edge, increasing the energy storage modulus of the triggering region by no less than 200% and limiting the crack propagation rate to below 0.5 mm / s.

4. A method for preparing a Shangri-La curtain fabric made of natural materials, characterized in that, include: Step 1: Preparation of the roll material: Cut the roll of natural material fabric into a standard size of 60cm in width along the weft direction; Replace the weft direction of the cut natural material fabric with the warp direction, and splice the short side together with paper tape with a width of not less than 5cm. At the joint, a zigzag sewing machine is used to sew along the center line of the paper tape to reinforce it, forming a reinforced roll. The reinforced roll material is cut into strips with a width of 8.6cm using a slitting machine; Step 2: Applying glue, stretching, and pressing to shape: Apply hot melt adhesive with a width of not less than 1.5mm to both sides of the fabric strip, with the hot melt adhesive on both sides located on the upper and lower sides of the fabric strip respectively. Cut the fabric strips to a length equal to 3.25m in width to the base yarn or face yarn; Fabric strips are placed tightly on the base yarn in sequence, and then the face yarn is covered on top to form an overlay structure consisting of the base yarn, fabric strips and face yarn. The overlapping structure is placed in a heat press device and heat-pressed at a temperature of 135℃-145℃ for 4-6 seconds, so that one side of the fabric strip is bonded to the base yarn and the other side is bonded to the face yarn, thus obtaining the Shangri-La curtain fabric.

5. The method for preparing a Shangri-La curtain fabric made of natural materials according to claim 4, characterized in that: In the weaving process of the natural material fabric mentioned in step one, a shape memory sacrificial yarn with a mass fraction of 1% to 5%, a linear density of 0.8 to 1.7 dtex, and an arrangement spacing of 1 to 3 yarns / cm is pre-placed along the width direction of the leaf strip. After weaving, the sacrificial yarn enters the subsequent weft direction cutting, replacement, splicing, sewing reinforcement and slitting steps together with the natural fibers. During the use of the finished Shangri-La curtain fabric, at a temperature of 40℃ to 65℃ or a relative humidity of not less than 60%, a shrinkage strain of not less than 3% is generated along the axial direction to apply a pulling force and maintain the shape when a right-angle crack appears.

6. The method for preparing a Shangri-La curtain fabric made of natural materials according to claim 4, characterized in that: In the weaving process of the natural material fabric described in step one, a strain-hardening sacrificial yarn with a mass fraction of 2% to 6% is pre-placed along the width direction of the leaf strip. The sacrificial yarn is a composite structure of natural fiber shells encapsulating capsules. The capsules contain plant polyphenols and trivalent metal ion coordination systems or bio-based curable resins. After weaving, the sacrificial yarn enters the subsequent weft direction cutting, replacement, splicing, sewing reinforcement and slitting steps together with the natural fibers. When the Shangri-La curtain fabric is used and breaks under tension in the right-angle direction, the contents of the capsules are released, forming a hardened bridging layer at the crack edge, increasing the energy storage modulus of the triggering area by no less than 200%, and limiting the crack propagation rate to below 0.5 mm / s.

7. A method for preparing a Shangri-La curtain fabric made of natural materials according to any one of claims 4-6, characterized in that: The natural material fabric is woven from one of the following five fiber raw materials by weight percentage: Fiber raw material 1: 70% paper fiber and 30% Bengal hemp fiber; Fiber raw material 2: 50% flax fiber and 50% Manila hemp fiber; Fiber raw material three: 80% flax fiber, 20% ramie fiber, and polyester-cotton blended fiber; Fiber raw material four: 70% paper fiber and 30% ramie fiber; Fiber raw material five: 100% Bengal jute fiber.

Images