High-strength silk and hemp blended fabric and manufacturing process thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUJIANG XINSHEN WEAVING FACTORY
- Filing Date
- 2026-03-09
- Publication Date
- 2026-05-29
Smart Images
Figure CN121802604B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of blended fabric technology, specifically relating to a high-strength silk-linen blended fabric and its manufacturing process. Background Technology
[0002] Silk-linen blends and interwoven fabrics, as a high-performance biomass structural material, aim to combine the high toughness and biocompatibility of silk with the high stiffness and excellent support of linen fibers through the spatial interlacing of warp and weft yarns. Currently, these fabrics have transcended traditional apparel applications, demonstrating enormous potential in fields requiring high dimensional stability and specific mechanical responses.
[0003] To achieve specific properties in silk and linen fabrics, current technologies primarily rely on altering the arrangement density of warp and weft yarns or employing basic plain or twill weave structures. In terms of weaving processes, traditional single-warp beam feeding systems and constant tension take-up patterns are typically used. However, relying solely on existing conventional weaving methods and simple two-dimensional structures presents significant structural and mechanical bottlenecks in the preparation of high-strength, fatigue-resistant engineering-grade silk and linen fabrics.
[0004] First, the single-weaving tension field suffers from modulus mismatch. There are fundamental differences in the tensile modulus and elongation at break between silk and hemp fibers. In existing single-warp beam weaving processes, yarns with different mechanical properties are forcibly constrained under the same weft tension during opening and bedding. When the finished fabric is subjected to external loads, the internal stress state left by this equal-tension weaving causes the low-elongation hemp fibers to break before the silk fibers, failing to achieve coordinated load-bearing between the skeleton and matrix, leading to structural brittleness of the entire fabric. Second, the constraint force of conventional interlacing topologies is insufficient. Silk has an extremely low surface friction coefficient, while hemp fibers are highly rigid and resilient. In conventional fabric structures, warp and weft yarns are interlocked only by simple geometric buckling. Under complex stress fields or dynamic friction, this simple interlacing point cannot provide sufficient normal constraint force, causing smooth silk yarns to easily slip macroscopically on the surface of rigid hemp yarns, resulting in a loose fabric structure, uncontrollable porosity, and severely affecting the material's physical strength and dimensional stability.
[0005] To address the issues of insufficient strength and poor functional modification effects in existing silk-linen blended fabrics, a high-strength silk-linen blended fabric and its manufacturing process are proposed. Summary of the Invention
[0006] The purpose of this invention is to provide a high-strength silk-linen blended fabric and its manufacturing process. This invention involves swelling and activating linen fibers, then padding them and blending them with silk fibers to obtain modified blended fibers. The fabric is blended using silk fibers as warp A and the modified blended fibers as warp B. During the blending process, the weft yarn uses the modified blended fibers, and the warp A and weft yarns interweave to form a mesh frame. Different density manufacturing zones are set along the warp direction and arranged at intervals. These manufacturing zones include a high-density reinforcement zone and a low-density breathable zone. After blending, the fabric is washed, desized, and stretched to obtain a high-strength silk-linen blended fabric.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A high-strength silk-linen blended fabric and its manufacturing process include the following steps:
[0009] Unless otherwise specified, the parts in this invention refer to parts by mass.
[0010] The hemp fiber was swollen and activated by immersing it in an ionic liquid and heating it to 55-60℃ for 30 minutes. Then, 2 g / L of pectinase and 0.5 g / L of xylanase were added to the ionic liquid, the pH was adjusted to 5.0-5.5, and the mixture was treated with ultrasound at 25-30 kHz for 50 minutes. Specifically, the hemp fiber was raw flax with a metric count of 2000-2500 Nm; the ionic liquid was an aqueous solution of 1-butyl-3-methylimidazolium chloride, with a mass concentration of 5 wt%; and the bath ratio of hemp fiber to ionic liquid was 1:15.
[0011] After swelling and activation, the hemp fibers are washed twice with hot water at 80°C and once with cold water at 25°C. Then, they are dried until the moisture regain of the hemp fibers is in the range of 10-12%.
[0012] Silk fibroin and nanocellulose were dispersed in water to obtain a modified solution. The mass concentration of silk fibroin was 2 wt%, and the mass ratio of nanocellulose to silk fibroin was 1:8. Specifically, after the silk fibroin and nanocellulose were dispersed in water, 0.5% glycerol was added according to the total mass of the liquid, and the mixture was stirred for 30 min and then ultrasonically dispersed for 10 min to obtain the modified solution.
[0013] The hemp fiber was impregnated with a modified liquid using a two-dip, two-roll process with a roll-off rate of 75-80%. After impregnation, the hemp fiber was dried with hot air at 105°C for 5 minutes.
[0014] Hemp and silk fibers are blended at a ratio of 35-47:60, with a roving weight of 4.0-5.0 g / 10m and a yarn twist coefficient of 340-360. The blended fabric is then fed into a double-tank impregnation section. The first impregnation tank uses pre-hydrolyzed KH-560 coupling agent sol, and the second impregnation tank uses a mixture of modified starch and PVA sizing agent.
[0015] After drying, modified blended fibers are obtained.
[0016] The specific operating parameters for the dual-tank impregnation section are as follows: the KH-560 concentration of the slurry in the first impregnation tank is 2.0 wt%, and it is put into use after hydrolysis for 4 hours under conditions of pH = 4-4.5; the viscosity of the mixed slurry in the second impregnation tank is controlled at 12-16 mPa·s (95℃), and the working temperature of the second impregnation tank is set at 90-100℃. The PVA used in the mixed slurry is PVA-1799, the modified starch is phosphate starch, the dry weight ratio of PVA and modified starch is 65:35, and the total solids content of the mixed slurry is maintained between 6.0-7.5%.
[0017] Fabric blending: Silk fibers are used as warp A, and modified blended fibers are used as warp B. Warp A and warp B are wound on warp A beams and warp B beams, respectively. High warp A tension is applied to warp A beams, and low warp B tension is applied to warp B beams. Warp A and warp B are arranged alternately. The low warp B tension is mainly achieved by overfeeding to keep warp B beams in a relaxed state. The tension of single yarns on warp A beams is 28-35 cN / yarn, and the tension of single yarns on warp B beams is 4-8 cN / yarn.
[0018] The weft yarn uses modified blended fibers, and the warp and weft yarns interweave to form a grid frame. By adjusting the take-up speed, weaving zones of different densities are set in the warp direction: a 2cm high-density reinforcement zone and a 4-6cm low-density breathable zone are arranged alternately. The weft yarn density in the high-density reinforcement zone is controlled at 34-36 yarns / cm, and the weft yarn density in the low-density breathable zone is controlled at 24-27 yarns / cm.
[0019] After the blended fabric is washed and desized in hot water at 80-90℃, it is stretched and set at 160℃ with a machine speed of 30m / min and an overfeed rate of 10%, resulting in a high-strength silk-linen blended fabric.
[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0021] By using a specific ionic liquid to swell and activate hemp fibers, damage to cellulose from a strongly alkaline environment is avoided, effectively improving the retention rate of the single fiber breaking strength of the hemp fibers. Simultaneously, low-frequency ultrasonic cleaning is used during the treatment process for cavitation cleaning, which, with the help of the pre-swelling effect of the ionic liquid, effectively promotes the activation process and enhances the cleaning effect.
[0022] A modified liquid was prepared by blending waste silk protein from silk processing with nanocellulose. This liquid was then rapidly impregnated onto hemp fibers, causing the nanocellulose to fill the surface cracks of the hemp fibers, while the silk protein partially coated the surface. After drying, the silk protein underwent secondary structure rearrangement on the hemp fiber surface, making the surface properties of the hemp fibers more similar to those of silk fibers. This optimized the bonding properties of the blended fabric, improving its strength and comfort.
[0023] The silk-linen blended fabric is first impregnated in a tank containing a pre-hydrolyzed coupling agent sol, and then transferred to an impregnation tank containing a high-viscosity main sizing agent. After the fabric is dried following the two impregnations, the silanol groups that have penetrated into the yarn form chemical bonds with the hydroxyl groups on the surface of the linen fibers and the amino groups on the surface of the silk fibers. The silanols condense to form a polysiloxane skeleton, which restricts the relative slippage of the silk and linen fibers, thereby improving the strength of the fabric. At the same time, the sizing film formed by the main sizing agent also ensures smoothness during the high-speed weaving process.
[0024] The fabric employs a double-warp beam weaving method. Warp A is wound with fibrous fibers and subjected to high machine tension, while warp B is wound with pre-treated modified blended fibers and subjected to low machine tension. During weaving, warp A is kept in a pre-stretched state, and the mesh frame formed by the modified blended fibers and warps A and B restricts the slippage of the hemp fibers. Furthermore, the existence of tiny movement spaces between the hemp fibers within the mesh frame effectively releases the point load on the fabric, improving its tear resistance.
[0025] During the weaving process, the fabric is controlled to form a cyclic structure of high-density reinforcement zones and low-density breathable zones along the warp direction. In the section weaving the high-density reinforcement zone, the take-up speed is adjusted to increase the weft density, causing the hemp fibers to form a locally highly filled state. The resulting blended fabric acts as a reinforcing rib, preventing the extension of crack lines, while the low-density breathable zones ensure the excellent breathability of the blended fabric. Attached Figure Description
[0026] Figure 1 This is a flowchart illustrating the manufacturing process of silk-linen blended fabrics in this invention. Detailed Implementation
[0027] The technical solution of the present invention will be clearly and completely described below through some embodiments and experimental examples. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0028] Reference Figure 1 The process flow diagram shown illustrates that this invention provides a high-strength silk-linen blended fabric and its manufacturing process. The technical solution is as follows:
[0029] Example 1
[0030] The hemp fiber was swollen and activated by immersing it in an ionic liquid and heating it to 55-60℃ for 30 minutes. Then, 2 g / L of pectinase and 0.5 g / L of xylanase were added to the ionic liquid, the pH was adjusted to 5.0-5.5, and the mixture was treated with ultrasound at 25-30 kHz for 50 minutes. Specifically, the hemp fiber was raw flax with a metric count of 2000-2500 Nm; the ionic liquid was an aqueous solution of 1-butyl-3-methylimidazolium chloride, with a mass concentration of 5 wt%; and the ratio of hemp fiber to ionic liquid was 1:15.
[0031] After swelling and activation, the hemp fibers are washed twice with hot water at 80°C and once with cold water at 25°C. Then, they are dried until the moisture regain of the hemp fibers is in the range of 10-12%.
[0032] Silk fibroin and nanocellulose were dispersed in water to obtain a modified solution. The mass concentration of silk fibroin was 2 wt%, and the mass ratio of nanocellulose to silk fibroin was 1:8. Specifically, after the silk fibroin and nanocellulose were dispersed in water, 0.5% glycerol was added according to the total mass of the liquid, and the mixture was stirred for 30 min and then ultrasonically dispersed for 10 min to obtain the modified solution.
[0033] The hemp fiber was impregnated with a modified liquid using a two-dip, two-roll process with a roll-off rate of 75-80%. After impregnation, the hemp fiber was dried with hot air at 105°C for 5 minutes.
[0034] Hemp and silk fibers are blended at a ratio of 35:60, with a roving weight of 4.0-5.0 g / 10m and a yarn twist coefficient of 340-360. The blended fabric is then fed into a double-tank impregnation section. The first impregnation tank uses pre-hydrolyzed KH-560 coupling agent sol, and the second impregnation tank uses a mixture of modified starch and PVA sizing agent.
[0035] After drying, modified blended fibers are obtained.
[0036] The specific operating parameters of the dual-tank impregnation section are as follows: the mass concentration of KH-560 in the slurry in the first impregnation tank is 2.0wt%, and it is put into use after hydrolysis for 4 hours under the condition of pH value = 4-4.5; the viscosity of the mixed slurry in the second impregnation tank is controlled at 12-16mPa·s (95℃), and the working temperature of the second impregnation tank is set at 90-100℃.
[0037] Fabric blending: Silk fiber is used as warp A, and modified blended fiber is used as warp B. Warp A is subjected to high machine tension, and warp B is subjected to low machine tension. Warp A and warp B are wound on warp A and warp B beams respectively, with the warp A and warp B beams arranged alternately. The low machine tension is mainly achieved by overfeeding to keep warp B beam in a relaxed state. The single yarn tension of warp A is 28 cN / yarn, and the single yarn tension of warp B is 4 cN / yarn.
[0038] The weft yarn uses modified blended fibers, and the warp and weft yarns interweave to form a grid frame. By adjusting the take-up speed, weaving zones of different densities are set in the warp direction: a 2cm high-density reinforcement zone and a 4cm low-density breathable zone are arranged alternately. The weft yarn density in the high-density reinforcement zone is controlled at 34-36 yarns / cm, and the weft yarn density in the low-density breathable zone is controlled at 24-27 yarns / cm.
[0039] After the blended fabric is washed and desized in hot water at 80-90℃, it is stretched and set at 160℃ with a machine speed of 30m / min and an overfeed rate of 10%, resulting in a high-strength silk-linen blended fabric.
[0040] Examples 2-16 differ from Example 1 in operating parameters, but the other process steps and the range of raw material selection are the same.
[0041] The specific changes in operating parameters are summarized in Table 1.
[0042] Table 1. Changes in operating parameters in Examples 1-16
[0043] Modified blended fiber hemp fiber blend ratio Tension of single yarn on warp beam A (cN / yarn) Tension of single yarn on warp beam (cN / yarn) Width of low-density breathable zone (cm) Example 1 35 28 4 4 Example 2 47 35 8 6 Example 3 41 31 6 5 Example 4 38 33 5 4 Example 5 44 29 7 6 Example 6 36 34 4 5 Example 7 45 30 8 4 Example 8 40 32 5 6 Example 9 43 28 7 5 Example 10 37 35 4 4 Example 11 46 31 8 6 Example 12 39 33 6 4 Example 13 42 29 5 6 Example 14 35 34 7 5 Example 15 47 30 4 4 Example 16 41 32 8 6
[0044] Comparative Example 1
[0045] Unlike Example 1, ionic liquid treatment was not used. Instead, the mixture was boiled in a 10 g / L sodium hydroxide aqueous solution at 100°C for 60 min. All other process parameters remained the same.
[0046] Comparative Example 2
[0047] Unlike Example 1, enzymatic hydrolysis and ultrasonic treatment were not performed, but all other process parameters remained the same.
[0048] Comparative Example 3
[0049] Unlike Example 5, no silk protein was added to the modified solution, but all other process parameters remained the same.
[0050] Comparative Example 4
[0051] Unlike Example 5, the drying temperature after padding of the hemp fiber was set to 60°C, while all other process parameters remained the same.
[0052] Comparative Example 5
[0053] Unlike Example 8, the first immersion treatment is not performed, but all other process parameters are the same.
[0054] Comparative Example 6
[0055] Unlike Example 8, the second immersion treatment is not performed, but all other process parameters are the same.
[0056] Comparative Example 7
[0057] Unlike Example 11, both warp shaft A and warp shaft B use a tension of 20 cN / shaft, while other process parameters are the same.
[0058] Comparative Example 8
[0059] Unlike Example 11, the tension of warp shaft A was set to 8 cN / shaft, and the tension of warp shaft B was set to 31 cN / shaft, while other process parameters remained the same.
[0060] Comparative Example 9
[0061] Unlike Example 14, no zonal weaving was performed, and the weft density of the entire fabric was 34-36 threads / cm, while other process parameters remained the same.
[0062] Comparative Example 10
[0063] Unlike Example 14, no zonal weaving was performed, and the weft density of the entire fabric was 24-27 threads / cm, while other process parameters remained the same.
[0064] Experimental Example 1
[0065] The residual glue rate and breaking strength of the silk-linen blended fabrics prepared in Examples 1-4 and Comparative Examples 1-2 were tested, and the relevant results are summarized in Table 2.
[0066] The test method for residual glue rate is as follows: refer to the relevant test methods of GB / T 5881-2024 standard, take a 50cm×50cm silk-linen blended fabric sample, and calculate the residual glue rate R (%) by the difference in dry weight before and after acid and alkali boiling treatment. The lower the residual glue rate, the better the product quality of the fabric.
[0067] The test method for breaking strength is as follows: referring to the relevant test methods of GB / T 3923.1-2013, warp and weft samples are cut separately, with an effective width of 50 mm, a spacing of 200 mm, a tensile speed of 100 mm / min, and a pretension of 5 N. The maximum breaking strength (N) when the fabric breaks is recorded.
[0068] Table 2. Residual glue content and tensile strength of silk-linen blended fabrics prepared in Examples 1-4 and Comparative Examples 1-2
[0069] Residual glue rate R (%) Maximum meridional fracture strength (N) Maximum latitudinal fracture strength (N) Example 1 3.1 1050 985 Example 2 2.9 1065 990 Example 3 3.3 1045 985 Example 4 3.0 1055 995 Comparative Example 1 1.8 865 835 Comparative Example 2 9.4 925 900
[0070] As shown in Table 2, the maximum breaking strength of the silk-linen blended fabrics prepared in Examples 1 to 4 was significantly higher than that of Comparative Example 1 and Comparative Example 2 in both the warp and weft directions, and the residual glue rate remained at a low level. This indicates that the linen fiber pretreatment process used in the examples has significant advantages in protecting the fiber strength and improving the mechanical properties of the fabric while efficiently degumming the fibers.
[0071] Comparative Example 1 used high-temperature, strong-alkali scouring instead of mild ionic liquid treatment. Although the strong corrosive chemical action reduced the residual gum rate, it damaged the cellulose structure inside the hemp fibers, leading to a decrease in fiber polymerization and ultimately a significant reduction in the fabric's tensile strength. Comparative Example 2 did not undergo enzymatic hydrolysis and ultrasonic treatment, thus lacking the specific degradation effect of biological enzymes on impurities such as pectin. It also lacked the physical promotion of the treatment solution penetration by the ultrasonic cavitation effect, resulting in incomplete gum removal, a high residual gum rate, and insufficient activation of the hemp fibers, limiting the improvement of the final fabric strength.
[0072] In summary, this invention utilizes a specific ionic liquid to pre-swell and activate hemp fibers under mild conditions, fundamentally avoiding the damage to cellulose caused by traditional strongly alkaline environments, thus effectively preserving the single-fiber breaking strength of the hemp fibers. Building upon this, the invention combines enzymatic hydrolysis with low-frequency ultrasonic treatment, leveraging the cavitation effect generated by ultrasound to assist ionic liquid penetration and accelerate the enzyme's contact and decomposition of deep-seated gums. This synergistic effect of chemical swelling, biodegradation, and physical cleaning ensures excellent cleaning and activation effects while maximizing the retention of fiber strength, significantly improving the overall quality and mechanical properties of silk-hemp blended fabrics.
[0073] Experiment Example 2
[0074] The surface friction coefficient and breaking strength of the silk-linen blended fabrics prepared in Examples 5-7 and Comparative Examples 3-4 were tested, and the relevant results are summarized in Table 3.
[0075] The test method for the surface friction coefficient is as follows: using a fixed load of 50N and a wool felt friction head, the dynamic friction coefficient μ of the fabric product surface is tested at a sliding speed of 20cm / min.
[0076] The method for testing the breaking strength of fabrics is described in Experimental Example 1.
[0077] Table 3. Surface friction coefficient and breaking strength of silk-linen blended fabrics prepared in Examples 5-7 and Comparative Examples 3-4
[0078] Coefficient of kinetic friction μ Maximum meridional fracture strength (N) Maximum latitudinal fracture strength (N) Example 5 0.18 1040 980 Example 6 0.20 1060 990 Example 7 0.20 1050 990 Comparative Example 3 0.31 1020 975 Comparative Example 4 0.33 945 885
[0079] As shown in Table 3, the surface dynamic friction coefficient of the silk-linen blended fabrics prepared in Examples 5 to 7 was significantly lower than that of Comparative Examples 3 and 4. At the same time, they showed significant advantages in the maximum breaking strength in both the warp and weft directions. This indicates that the silk protein and nanocellulose blending modification liquid used in the examples, combined with a specific high-temperature drying process, plays a key role in improving the smoothness of the fiber surface and enhancing the overall mechanical properties of the fabric.
[0080] Comparative Example 3 did not add silk fibroin to the modification solution, relying solely on nanocellulose to fill the physical cracks on the surface of the hemp fibers. While this repaired microscopic defects to some extent, the lack of a continuous lubricating coating layer formed by silk fibroin resulted in a still relatively rough fiber surface, high frictional resistance, and failed to effectively improve the interfacial compatibility between hemp and silk fibers, limiting further improvement in fabric strength. Comparative Example 4, although using a complete modification solution formulation, had a low drying temperature, failing to meet the thermodynamic conditions required for thermally induced secondary structure rearrangement of silk fibroin. This resulted in loose and weakly bonded silk fibroin molecular chains adsorbed on the fiber surface, failing to form a dense and smooth modified layer to reduce the coefficient of friction. Furthermore, the weak interfacial bonding led to a significant decrease in the fabric's tensile strength, exhibiting the lowest value among all groups.
[0081] In summary, this invention utilizes the small-size effect of nanocellulose to physically fill the micro-cracks on the surface of hemp fibers, and leverages the film-forming properties of silk fibroin to comprehensively coat the fiber surface. These two processes, driven by a specific high-temperature drying process, produce a significant synergistic effect. The filling effect of nanocellulose provides a smooth substrate for subsequent coating, while the high-temperature environment induces secondary structure rearrangement of silk fibroin molecules, achieving densification and immobilization of the modified layer structure, making the surface properties of hemp fibers highly similar to those of silk fibers. This organic combination of micro-filling and surface structure reconstruction significantly reduces the coefficient of friction on the fabric surface, giving it an excellent smooth feel, and also greatly improves the overall tensile strength of the blended fabric by optimizing the interfacial bonding performance between fibers.
[0082] Experimental Example 3
[0083] The anti-slip properties and abrasion resistance of the silk-linen blended fabrics prepared in Examples 8-10 and Comparative Examples 5-6 were tested. The relevant results are summarized in Table 4.
[0084] The test method for slip resistance refers to GB / T 13772.2-2008 standard. A load is applied to the fabric sample, and the actual slip load (N) is measured when the amount of slippage generated by the yarn at the warp seam is equal to 6 mm. The larger the slip load, the better the slip resistance.
[0085] The abrasion resistance test method refers to GB / T 21196.2-2007 standard. The abrasion test is carried out under a load of 300N. The minimum number of abrasion breaks that cause yarn breakage in the sample is recorded. The higher the number of abrasion breaks, the better the abrasion resistance.
[0086] Table 4. Fabric anti-slip properties and abrasion resistance of silk-linen blended fabrics prepared in Examples 8-10 and Comparative Examples 5-6
[0087] Sliding load (N) Minimum number of wear cycles Example 8 525 12500 Example 9 540 11900 Example 10 535 12400 Comparative Example 5 325 11300 Comparative Example 6 385 9450
[0088] As shown in Table 4, the slip load and minimum number of abrasion breaks of the silk-linen blended fabrics prepared in Examples 8 to 10 were significantly better than those in Comparative Examples 5 and 6, indicating that the dual-groove impregnation process has significant advantages in simultaneously improving the structural stability and surface abrasion resistance of the fabric.
[0089] Comparative Example 5, lacking the first impregnation treatment and the infiltration modification step of the coupling agent sol, resulted in a significant decrease in the fabric's slip load. This is because the lack of chemical bonding between silanol groups and the hydroxyl groups of hemp fibers and the amino groups of silk fibers prevents the formation of a polysiloxane skeleton within the yarn to restrict relative fiber slippage. The physical bonding of the main sizing agent alone is insufficient to resist misalignment between yarns. Comparative Example 6, lacking the second impregnation treatment and the surface coating of the high-viscosity mixed sizing agent, significantly reduced the minimum abrasion resistance of the fabric. This indicates that the lack of a tough sizing film formed on the yarn surface by the main sizing agent fails to effectively seal the fibers and provide smooth protection, causing direct damage to the fabric during mechanical friction and a significant deterioration in abrasion resistance.
[0090] In summary, this invention employs a dual-tank sizing process, utilizing the chemical penetration of the pre-hydrolyzed coupling agent in the first tank and the physical coating of the high-viscosity main sizing agent in the second tank to produce a significant synergistic and complementary effect. Under specific hydrolysis conditions, the active silanol groups generated by the coupling agent penetrate deep into the fiber to establish a chemical cross-linking network, constructing a stable internal anti-slip framework, while the main sizing agent forms a dense protective film on the outer layer of the fabric. This combination of internal chemical bonding and external physical film protection effectively limits the relative slippage between silk and linen fibers, significantly improving the fabric's anti-slip capability, and also significantly enhances the wear resistance of the fabric surface, achieving a dual improvement in both the fabric's internal structural stability and external durability.
[0091] Experiment Example 4
[0092] The breaking strength and slip resistance of the silk-linen blended fabrics prepared in Examples 11-13 and Comparative Examples 7-8 were tested, and the relevant results are summarized in Table 5.
[0093] The method for testing fracture strength is the same as that in Experiment Example 1, and the method for testing slip resistance is the same as that in Experiment Example 3.
[0094] Table 5. Breaking strength and slip resistance of silk-linen blended fabrics prepared in Examples 11-13 and Comparative Examples 7-8
[0095] Maximum meridional fracture strength (N) Maximum latitudinal fracture strength (N) Sliding load (N) Example 11 1045 990 530 Example 12 1060 980 535 Example 13 1040 980 530 Comparative Example 7 880 805 410 Comparative Example 8 750 680 295
[0096] As shown in Table 5, the maximum breaking strength and slip load of the silk-linen blended fabrics prepared in Examples 11 to 13 were significantly higher than those in Comparative Examples 7 and 8, indicating that the double warp beam differentiated tension weaving process plays a decisive role in constructing the fabric skeleton structure and improving the overall mechanical stability.
[0097] Comparative Example 7 uses equal tension settings for warp axes A and B. This prevents the silk fibers of warp axis A from reaching a sufficiently pre-stretched state to act as a rigid skeleton, while also limiting the microscopic movement space of the hemp fibers of warp axis B. This results in insufficient fabric density, difficulty in effective coordination under stress, and mediocre performance in terms of breaking strength and anti-slip properties. Comparative Example 8 uses a reverse tension configuration, leaving the silk fibers, which are the main load-bearing units, in a relaxed state, while the hemp fibers with lower elongation are forced to bear high tension. This mismatch leads to extremely uneven internal stress distribution in the fabric under stress, making the structure prone to collapse, and causing both breaking strength and anti-slip load to drop to the lowest levels.
[0098] In summary, this invention employs a dual-warp beam differentiated weaving strategy. High warp beam tension locks the A-warp beam fibers in a pre-stretched state, constructing a robust mesh frame skeleton. Negative tension imparts a specific relaxation and micro-bending morphology to the B-warp beam hemp fibers. This structural design of a rigid skeleton and flexible filling produces a significant synergistic effect: the taut fiber mesh frame effectively restricts the relative displacement of the yarns, greatly improving the fabric's anti-slip capability. Simultaneously, it bears the main tensile load, significantly improving the fabric's breaking strength, thus achieving simultaneous optimization of fabric structural stability and mechanical properties.
[0099] Experimental Example 5
[0100] The air permeability and anti-slip properties of the silk-linen blended fabrics prepared in Examples 14-16 and Comparative Examples 9-10 were tested, and the relevant results are summarized in Table 6.
[0101] The test method for air permeability refers to the relevant test method of GB / T 5453-1997 standard. Under an air pressure difference of 100Pa, the airflow rate passing through a 50cm×50cm sample is measured, and the gas flow rate is recorded as the air permeability (mm / s).
[0102] For the test method of anti-slip property, refer to Experiment Example 3.
[0103] Table 6. Air permeability and anti-slip properties of silk-linen blended fabrics prepared in Examples 14-16 and Comparative Examples 9-10
[0104] Air permeability (mm / s) Sliding load (N) Example 14 184.3 525 Example 15 181.2 535 Example 16 188.7 510 Comparative Example 9 114.6 565 Comparative Example 10 202.4 480
[0105] As shown in Table 6, the silk-linen blended fabrics prepared in Examples 14 to 16 had significantly higher air permeability than Comparative Example 9, while their slip load was significantly higher than Comparative Example 10, indicating that the variable density cyclic weaving process has significant advantages in balancing the breathability and comfort of the fabric with its structural stability.
[0106] Comparative Example 9 uses a single high weft yarn density throughout the fabric. Although the tight warp and weft interweaving structure brings high slippage load, the excessively dense yarn filling severely blocks airflow pores, causing a precipitous drop in air permeability and seriously impairing the fabric's breathability. Comparative Example 10 uses a single low weft yarn density throughout the fabric. Although the sparse structure gives the fabric excellent air permeability, the lack of sufficient weft yarn filling density results in insufficient frictional cohesion between yarns, leading to a significant reduction in slippage load and failing to meet the structural stability requirements of high-strength fabrics.
[0107] In summary, this invention employs a variable-density weaving strategy that alternates between high-density reinforcement zones and low-density breathable zones along the warp direction. The high-density zones utilize the highly filled hemp fibers to construct a rigid barrier similar to reinforcing ribs, effectively preventing yarn slippage and the extension of crack lines under stress. Simultaneously, the sparse interweaving structure retained in the low-density zones maintains excellent air conduction channels. This alternating dense and sparse structural design produces a significant synergistic and complementary effect: the high-density reinforcement zones effectively compensate for the mechanical shortcomings of the loose structure and easy slippage in the low-density zones, while the low-density breathable zones address the functional defects of the closed structure and poor breathability in the high-density zones. This achieves the optimal balance between high anti-slip structural stability and excellent breathability and comfort in silk-hemp blended fabrics.
[0108] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A manufacturing process for a high-strength silk-linen blended fabric, characterized in that: The manufacturing process is as follows: The hemp fiber was swollen and activated by immersing it in an ionic liquid and heating it to 55-60℃ for 30 minutes. Then, 2 g / L of pectinase and 0.5 g / L of xylanase were added to the ionic liquid, the pH was adjusted to 5.0-5.5, and the fiber was treated with an ultrasonic frequency of 25-30 kHz for 50 minutes. After swelling and activation, the hemp fibers are washed twice with hot water at 80°C and once with cold water at 25°C. Then they are dried until the moisture regain of the hemp fibers is in the range of 10-12%. Silk protein and nanocellulose were dispersed in water to obtain a modified solution; The hemp fiber was impregnated with the modified liquid using a two-impregnation and two-padding process. After impregnation, the hemp fiber was dried with hot air at 105°C for 5 minutes. The hot-air dried hemp fiber and silk fiber are blended in a ratio of 35-47:60 to obtain modified blended fiber. The fabric is blended using the silk fiber as warp A and the modified blended fiber as warp B, with warp A and warp B wound on warp A and warp B respectively. Wherein, the first warp shaft is subjected to high machine tension, the second warp shaft is subjected to low machine tension, and the first and second warps are arranged alternately; During the blending process of the fabric, the weft yarn uses the modified blended fiber, and the warp yarn and the weft yarn interweave to form a grid frame; different density manufacturing zones are set in the warp direction and arranged at intervals; the manufacturing zones respectively include a high-density reinforcement zone and a low-density breathable zone; After the blending process is completed, the fabric is washed, desized, and stretched to obtain the high-strength silk-linen blended fabric.
2. The manufacturing process of a high-strength silk-linen blended fabric according to claim 1, characterized in that: The tension of the single yarn of warp beam A is 28-35 cN / yarn, and the tension of the single yarn of warp beam B is 4-8 cN / yarn.
3. The manufacturing process of a high-strength silk-linen blended fabric according to claim 1, characterized in that: The width of the high-density reinforced zone is 2cm, and the width of the low-density breathable zone is 4-6cm.
4. The manufacturing process of a high-strength silk-linen blended fabric according to claim 1, characterized in that: The weft density of the high-density reinforced zone is controlled at 34-36 yarns / cm, and the weft density of the low-density breathable zone is controlled at 24-27 yarns / cm.
5. A high-strength silk-linen blended fabric, comprising: The fabric comprises warp yarns and weft yarns, wherein the warp yarns are divided into warp A and warp B, and warp A and warp B are wound on warp A beam and warp B beam respectively; it is further characterized in that the high-strength silk-linen blended fabric is prepared by the manufacturing process described in any one of claims 1-4.