High-elasticity dyed terylene tatted gray fabric and low-tension setting process thereof

Abstract

The invention provides a high-elasticity dyed terylene woven gray fabric and a low-tension setting process thereof.The high-elasticity dyed terylene woven gray fabric comprises warp yarn of special-shaped section terylene filament yarn and weft yarn of terylene textured yarn, the surface of the gray fabric is of a three-dimensional corrugated structure, the main axis direction of three-dimensional corrugations and the warp direction of the gray fabric are obliquely crossed by 15-30 degrees, and the main axis direction of the three-dimensional corrugations is perpendicular to the warp direction of the gray fabric. The wave height of the three-dimensional ripples is 0.2 to 0.5 mm, and the wavelength of the three-dimensional ripples is The crystallinity of the fiber surface layer of the gray fabric in the direction from the surface layer to the core layer is in gradient change, the crystallinity of the surface layer is 58%, and the crystallinity of the core layer is 62%; and the porosity of the gray fabric is 32-38%.

Description

Technical Field

[0001] The invention relates to the technical field of fabric production technology, in particular to a high-elasticity dyed polyester woven grey fabric and a low-tension shaping process thereof. Background Art

[0002] The core goal of the traditional polyester woven grey fabric shaping process is to eliminate the internal stress of the fabric, stabilize the size and improve the surface properties. The process chain can be divided into four key stages: preheating stage, high temperature shaping stage, tension maintenance stage, and rapid cooling stage.

[0003] In the preheating stage, the grey cloth enters the setting machine at a speed of 5-8m / min and is pre-dried by steam or infrared to remove surface moisture. At this stage, the hydrogen bonds inside the fiber begin to dissociate, but the molecular chains have not yet moved.

[0004] In the high-temperature setting stage, after the grey cloth enters the main setting area, the fabric is heated at a high temperature of 200-220℃, and at the same time, it is subjected to a warp tension of 300-500N under the mechanical stretching of the cloth clip chain. At this time, the fiber glass transition temperature is exceeded, and the molecular chain segments move violently. The high temperature causes the polyester molecular chain to de-orient, but the mechanical tension forces the molecular chain to rearrange along the stretching direction. For every 10℃ increase in temperature, the molecular chain movement speed increases by 2-3 times, resulting in rapid reconstruction of the crystallization area.

[0005] In the tension maintenance stage, stay in the high temperature zone for 30-60 seconds, and maintain the temperature fluctuation of ±3°C through the PID temperature control system. Under high tension, the fiber undergoes the following physical changes: 1. The molecular chains in the amorphous region are oriented along the tension direction; 2. The thickness of the lamellae increases; 3. The volume fraction of the crystalline region increases from the initial 55% to ≥65%.

[0006] In the rapid cooling stage, a high-pressure axial flow fan is used for forced air cooling, which reduces the fabric temperature to below 50°C within 5-8 seconds. The rapid cooling causes a temperature gradient between the surface layer and the core layer, resulting in residual thermal stress.

[0007] However, the traditional polyester woven fabric shaping process has the following phenomena: high tension affects the orientation of molecular chains, resulting in increased crystallinity, which ultimately leads to decreased elasticity of the fabric. High temperature gradient leads to non-equilibrium crystallization, resulting in internal stress accumulation, which ultimately leads to dimensional instability. Rapid cooling leads to glassification of the surface layer, resulting in decreased permeability, which ultimately leads to uneven dyeing.

[0008] Therefore, the performance contradiction of traditional grey fabrics is: the pursuit of dimensional stability requires increasing tension, but leads to loss of elasticity. Improving dyeing uniformity requires reducing crystallinity, but sacrificing dimensional stability. Improving production efficiency (shortening shaping time) exacerbates uneven thermal stress distribution. Summary of the invention

[0009] The present invention aims to solve the above technical problems and provides a high-elasticity dyed polyester woven grey fabric and a low-tension shaping process thereof.

[0010] A technical solution of the present invention is a high-elastic dyed polyester woven grey fabric, comprising warp yarns of polyester filaments with special cross-sections and weft yarns of polyester textured yarns, the surface of the grey fabric presents a three-dimensional corrugated structure, the main axis direction of the three-dimensional corrugation is oblique to the warp direction of the grey fabric at 15°-30°, the wave height of the three-dimensional corrugation is 0.2-0.5 mm, and the wavelength is 1.2-2.0 mm;

[0011] The crystallinity of the fiber surface layer of the grey cloth changes gradually towards the core layer, with the surface layer crystallinity being 58% and the core layer crystallinity being 62%.

[0012] The porosity of the grey cloth is 32-38%.

[0013] As an embodiment, the corrugation density of the three-dimensional corrugation is 4-6 / cm 2 .

[0014] Another technical solution of the present invention is a low tension shaping process for high elastic dyed polyester woven fabric, which is used to produce the high elastic dyed polyester woven fabric as described above.

[0015] In the established gradient temperature-tension coupling field, the grey cloth is crystallized in stages.

[0016] The gradient temperature-tension coupling field includes a 160°C preheating zone, a 185°C main shaping zone, and a 195°C stabilization zone for the grey cloth to pass through in sequence, and the time for the grey cloth to pass through the preheating zone, the main shaping zone, and the stabilization zone is 30s, 60s, and 30s, respectively;

[0017] The gradient temperature-tension coupling field also includes a tension control system, which controls the warp tension of the grey cloth to be 50-80N and the weft tension to be 30-50N. The tension control system is equipped with a strain sensor array to monitor the deformation of the grey cloth in real time, and adjusts the warp tension according to the monitoring results of the strain sensor array;

[0018] In the established stress relaxation-rebalancing system, the grey cloth is subjected to graded cooling and stress release;

[0019] The stress relaxation-rebalancing system includes a primary slow cooling zone from 190°C to 160°C, a secondary slow cooling zone from 160°C to 100°C, and a tertiary slow cooling zone from 100°C to 50°C, the cooling rates of the primary slow cooling zone and the secondary slow cooling zone are 3°C / s and 1°C / s respectively, and the tertiary slow cooling zone adopts spray cooling; the stress relaxation-rebalancing system also includes a rotary swing frequency mechanism, which is used to apply periodic strain to the grey cloth;

[0020] Establish a chemical-physical synergistic modification mechanism, spray SiO2 with a particle size of no more than 30 nm in the preheating zone. 2 -PDMS composite sol, nano-SiO 2 A mesoporous structure is constructed in the amorphous region of the grey fabric fiber, and the PDMS flexible chain segments are inserted into the gaps in the crystalline region to form a "rigid-flexible" interpenetrating network;

[0021] A multi-physical field coupling mechanism is established. A plurality of infrared thermal imagers are respectively arranged in the main shaping area and the stabilization area. When the infrared thermal imager detects that the local temperature of the grey cloth is greater than a first set value, a nitrogen curtain arranged at a corresponding position is started. A plurality of spectrophotometers are arranged at intervals on the path through which the grey cloth passes. When the DE values ​​of multiple consecutive detection points are greater than a second set value, the SiO 2 -Injection volume of PDMS composite sol.

[0022] As an embodiment, the preheating zone adopts far-infrared radiation heating, which penetrates 5-8 μm of the fiber surface layer of the grey cloth.

[0023] As an embodiment, nitrogen is introduced into the main shaping zone so that the oxygen content is less than 50 ppm.

[0024] As an embodiment, the warp tension and weft tension of the grey cloth are respectively provided by two groups of cloth clip chain machines distributed along the warp direction of the grey cloth and along the weft direction of the grey cloth, wherein one group of cloth clip chain machines distributed along the warp direction of the grey cloth responds to the piezoelectric ceramics in the strain sensor array to automatically adjust the warp tension.

[0025] As an embodiment, the three-stage slow cooling zone adopts spray cooling, and the droplet size is less than 20 μm.

[0026] As an implementation manner, the frequency of the rotary pendulum mechanism is 5-15 Hz, and the amplitude of the rotary pendulum mechanism is 0.5-1.5% of the circumference.

[0027] As an embodiment, SiO is injected into the preheating zone. 2 -The injection amount of PDMS composite sol is 0.5-1.2g / m 2 , so that its penetration depth on the fiber surface of the grey cloth is greater than 80μm.

[0028] Compared with the prior art, the beneficial effect of the present invention is that the low-tension shaping process of the high-elastic dyed polyester woven grey fabric breaks through the single field action mode and realizes the coordinated regulation of the tension field, temperature field, and chemical field. A gradient temperature-tension coupling field, a stress relaxation-rebalance system, a chemical-physical coordinated modification mechanism, and a multi-physical field coupling mechanism are established. The originally coupled crystallization process is decomposed into three stages: orientation relaxation (thermal field dominance), structural stability (force field regulation), and functional modification (chemical field intervention). Coordinated regulation is achieved from the molecular scale (cross-linked network) to the mesoscopic scale (pore structure), so that the elastic recovery rate of the process grey fabric is improved compared with the traditional process, the thermal shrinkage rate is reduced, and the dyeing uniformity is also better than the traditional process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A multi-field spatial distribution diagram of a low-tension shaping process for high-elastic dyed polyester woven fabric provided in an embodiment of the present invention;

[0030] Figure 2 A simplified view of a high-elasticity dyed polyester woven fabric provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0032] In one embodiment, the low-tension shaping process of the high-elastic dyed polyester woven grey fabric is as follows: in an established gradient temperature-tension coupling field, the grey fabric is subjected to staged crystallization control; the gradient temperature-tension coupling field includes a 160°C preheating zone, a 185°C main shaping zone, and a 195°C stabilization zone for the grey fabric to pass through in sequence, and the time for the grey fabric to pass through the preheating zone, the main shaping zone, and the stabilization zone is 30s, 60s, and 30s, respectively; the gradient temperature-tension coupling field also includes a tension control system, the tension control system controls the warp tension of the grey fabric to be 50-80N and the weft tension to be 30-50N, and the tension control system is configured with a strain sensor array to monitor the deformation of the grey fabric in real time, and according to The warp tension is adjusted based on the monitoring results of the strain sensor array; in the established stress relaxation-rebalancing system, the grey cloth is subjected to graded cooling and stress release; the stress relaxation-rebalancing system comprises a primary slow cooling zone from 190°C to 160°C, a secondary slow cooling zone from 160°C to 100°C, and a tertiary slow cooling zone from 100°C to 50°C, the cooling rates of the primary slow cooling zone and the secondary slow cooling zone are 3°C / s and 1°C / s respectively, and the tertiary slow cooling zone adopts spray cooling; the stress relaxation-rebalancing system also comprises a rotary pendulum frequency mechanism, which is used to apply periodic strain to the grey cloth; a chemical-physical synergistic modification mechanism is established, and SiO2 with a particle size of not more than 30nm is sprayed in the preheating zone. 2 -PDMS composite sol, nano-SiO 2 A mesoporous structure is constructed in the fiber amorphous region of the grey cloth, and the PDMS flexible chain segments are inserted into the gaps in the crystalline region to form a "rigid-flexible" interpenetrating network; a multi-physical field coupling mechanism is established, and a plurality of infrared thermal imagers are respectively arranged in the main shaping region and the stabilization region, and when the infrared thermal imager detects that the local temperature of the grey cloth is greater than a first set value, a nitrogen curtain arranged at a corresponding position is started; a plurality of spectrophotometers are arranged at intervals on the path through which the grey cloth passes, and when the DE values ​​of multiple consecutive detection points are greater than a second set value, the SiO 2 -Injection volume of PDMS composite sol.

[0033] In this embodiment, the performance contradiction existing in the traditional process grey cloth is to be solved, namely: the pursuit of dimensional stability requires increasing tension, but leads to elasticity loss. Improving dyeing uniformity requires reducing crystallinity, but sacrificing dimensional stability. Improving production efficiency exacerbates the uneven distribution of thermal stress. As a result, the traditional process grey cloth usually has problems such as excessive fiber orientation and elasticity loss, abnormal crystallization and mechanical degradation, and uneven thermal shrinkage. Fundamentally, the essence of this multi-objective conflict stems from the fact that the traditional process forcibly couples the thermodynamic equilibrium process (crystallization) with the non-equilibrium process (cooling), and fails to establish a gradient regulation mechanism.

[0034] To this end, the low-tension shaping process provided in this embodiment breaks through the single field action mode and realizes the coordinated regulation of tension field, temperature field and chemical field.

[0035] First, the low-tension shaping process provided in this embodiment establishes a gradient temperature-tension coupling field, which is divided into three levels of gradient temperature control, namely, preheating zone (160°C / 30s), main shaping zone (185°C / 60s), and stabilization zone (195°C / 30s), and is configured with intelligent tension control to control the warp tension to 50-80N and the weft tension to 30-50N, and adopts a strain sensor array (100 points / m 2 ) Real-time monitoring of fabric deformation. By constructing a temperature gradient, staged crystallization control can be achieved. Preheating at 160°C allows the molecular chains in the amorphous area to relax initially. During the main shaping at 185°C, the dipole molecules are oriented. During the stabilization stage at 195°C, the high crystallization area is heated to promote the perfection of the crystal area. The tension control system is adjusted according to real-time strain feedback. For example, when the warp elongation >2% is detected, the piezoelectric ceramic automatically releases the tension to prevent excessive orientation of the molecular chains. In this stage, the crystallinity gradient is distributed (58% for the surface layer and 62% for the core layer), which increases the elastic recovery rate to ≥92% while ensuring dimensional stability (heat shrinkage ≤1.5%).

[0036] Then, the low-tension shaping process provided in this embodiment establishes a stress relaxation-rebalancing system, which is equipped with three-stage slow cooling and stress release, wherein the first-stage slow cooling is from 190°C to 160°C (cooling rate 3°C / s), the second-stage slow cooling is from 160°C to 100°C (cooling rate 1°C / s), and the third-stage slow cooling is from 100°C to 50°C (spray cooling, droplet size 20μm). Stress release is achieved by a rotary pendulum mechanism (frequency 5-15Hz), which applies a periodic microstrain of 0.5-1.5%. The rapid cooling of the traditional process causes the surface layer to vitrify before the core layer, generating residual stress. The stress relaxation-rebalancing system controls the molecular mobility of different temperature zones through graded cooling, wherein the first-stage slow cooling allows the molecular chains in the amorphous zone to rearrange, the second-stage slow cooling promotes the improvement of the crystal zone structure, and the spray cooling forms a uniform vaporization layer. The swing frequency mechanism produces a mechanical annealing effect, and applying periodic strain can shorten the stress relaxation time by 40%. Actual measurements show that this technology reduces the thermal stress CV value from 8.2% to 2.5%, while controlling the total cooling time within 90s (the traditional process requires 120s).

[0037] In addition, the low tension setting process provided in this embodiment also establishes a chemical-physical synergistic modification mechanism and a multi-physical field coupling mechanism. In the traditional process, high crystallinity (≥65%) makes it difficult for dye molecules to penetrate. This chemical-physical synergistic modification mechanism is achieved by nano-SiO 2A mesoporous structure (pore size 2-5nm) is constructed in the amorphous region of the fiber to increase the dye adsorption sites. The PDMS flexible chain segments are inserted into the gaps in the crystalline region to form a "rigid-flexible" interpenetrating network. The so-called "rigid-flexible" interpenetrating network refers to a topological structure formed by two polymers with different moduli interpenetrating each other at the nanoscale. The rigid phase is nano-SiO 2 The three-dimensional inorganic network formed is an organic network composed of long chains of polydimethylsiloxane (PDMS) in the flexible phase. As a result, the surface layer of the grey cloth has low crystallinity (58%) and high porosity (38%), which greatly improves the K / S value (dye adsorption index). The core layer of the grey cloth has high crystallinity (62%) and a cross-linked network, which reduces the thermal shrinkage rate. A multi-physical field coupling mechanism is established to collect sensor data in real time and update the process parameter optimization plan. Taking the spectrophotometer as an example, when the risk of uneven dyeing is predicted (DE value>1.5), the SiO 2 Injection amount + 0.2g / m 2 Taking the infrared thermal imager as an example, when local overheating (>200°C) is detected, the emergency nitrogen curtain is activated to achieve rapid cooling.

[0038] In summary, the low-tension setting process provided in this embodiment decomposes the originally coupled crystallization process into three stages: orientation relaxation (dominated by thermal field), structural stabilization (force field regulation), and functional modification (chemical field intervention), and realizes coordinated regulation from the molecular scale (cross-linked network) to the mesoscopic scale (pore structure), so that the elastic recovery rate of the process grey cloth is improved compared with the traditional process, the thermal shrinkage rate is reduced, and the dyeing uniformity is also better than the traditional process.

[0039] In one embodiment, the low tension setting process of the high elastic dyed polyester woven grey fabric uses far infrared radiation heating in the preheating zone, penetrating 5-8 μm into the fiber surface of the grey fabric. In this embodiment, preheating at 160° C. causes the molecular chains in the amorphous region to initially relax.

[0040] In one embodiment, in the low tension setting process of the high elastic dyed polyester woven grey fabric, nitrogen is introduced into the main setting zone to make the oxygen content less than 50 ppm, so as to inhibit thermal oxidation.

[0041] In one embodiment, in the low-tension shaping process of the high-elasticity dyed polyester woven grey fabric, the warp tension and weft tension of the grey fabric are provided by two groups of cloth clip chain machines distributed along the warp direction of the grey fabric and along the weft direction of the grey fabric, respectively, wherein one group of cloth clip chain machines distributed along the warp direction of the grey fabric responds to the piezoelectric ceramics in the strain sensor array to automatically adjust the warp tension.

[0042] In this embodiment, the tension control system is adjusted according to real-time strain feedback. When the warp elongation is detected to be greater than 2%, the piezoelectric ceramic automatically releases the tension to prevent excessive orientation of the molecular chain. This stage makes the crystallinity gradient distributed, while ensuring dimensional stability (heat shrinkage ≤ 1.5%), the elastic recovery rate is increased to ≥ 92%.

[0043] In one embodiment, in the low-tension shaping process of the high-elasticity dyed polyester woven grey fabric, the three-stage slow cooling zone adopts spray cooling, and the droplet size is less than 20 μm.

[0044] In this embodiment, spray cooling can form a uniform vaporization layer.

[0045] In one embodiment, in the low tension shaping process of the high elastic dyed polyester woven fabric, the frequency of the rotary swing frequency mechanism is 5-15 Hz, and the amplitude of the rotary swing frequency mechanism is 0.5-1.5% of the circumference. 2 -The injection amount of PDMS composite sol is 0.5-1.2g / m 2 , so that its penetration depth on the fiber surface of the grey cloth is greater than 80μm.

[0046] In one embodiment, the high-elasticity dyed polyester woven fabric is made by the above-mentioned low-tension shaping process. Figure 2 As shown, the horizontal direction represents the weft direction, the vertical direction represents the warp direction, and the direction of the wavy lines represents the main axis direction of the three-dimensional corrugation. The high-elasticity dyed polyester woven grey cloth includes warp yarns of polyester filaments with special cross-sections and weft yarns of polyester textured yarns. The surface of the grey cloth presents a three-dimensional corrugated structure. The main axis direction of the three-dimensional corrugation is oblique to the warp direction of the grey cloth at 15°-30°. The wave height of the three-dimensional corrugation is 0.2-0.5mm, and the wavelength is 1.2-2.0mm. The crystallinity of the fiber surface layer of the grey cloth changes gradually toward the core layer, with the surface layer crystallinity being 58% and the core layer having a high crystallinity of 62%. The porosity of the grey cloth is 32-38%. Preferably, the corrugation density of the three-dimensional corrugation is 4-6 / cm 2 .

[0047] The composition of the high-elastic dyed polyester woven fabric is the warp yarn of the special-shaped cross-section polyester filament and the weft yarn of the polyester textured yarn. Its structural feature is that the surface of the fabric presents a three-dimensional corrugated structure. The wave height of the three-dimensional corrugation is 0.2-0.5mm, and its formation mechanism is the difference in the shrinkage rate of the high-elastic yarn of the weft yarn, and the wavelength is 1.2-2.0mm, and its formation mechanism is the bending stiffness of the special-shaped cross-section filament of the warp yarn. The special structure of the high-elastic dyed polyester woven fabric is that the fiber crystallinity gradient distribution and porosity, such fiber crystallinity is jointly formed by the aforementioned heating method, cooling rate, and chemical treatment, wherein the chemical treatment utilizes SiO 2The surface layer is controlled by nanoparticle surface deposition, and the core layer is controlled by PDMS segment permeation cross-linking. The low crystallinity (58%) of the surface layer improves the dye adsorption (increase in K / S value), and the high crystallinity (62%) of the core layer maintains dimensional stability (reduced thermal shrinkage). Such porosity affects air permeability and moisture permeability, and the three-dimensional corrugated gap enhances thermal resistance, thanks to the low tension setting (50-80N in the warp direction) that increases the porosity between yarns by 5-8%, and the nano-SiO 2 Filling increases the micropore ratio from 12% to 25%.

[0048] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. High elastic dyed polyester woven fabric, characterized in that: The surface of the grey fabric presents a three-dimensional corrugated structure, wherein the main axis direction of the three-dimensional corrugation is oblique to the warp direction of the grey fabric by 15°-30°, the wave height of the three-dimensional corrugation is 0.2-0.5 mm, and the wavelength is 1.2-2.0 mm; The crystallinity of the fiber surface layer of the grey cloth changes gradually towards the core layer, with the surface layer crystallinity being 58% and the core layer crystallinity being 62%. The porosity of the grey cloth is 32-38%.

2. The high elastic dyed polyester woven fabric according to claim 1, characterized in that: The corrugation density of the three-dimensional corrugation is 4-6 / cm 2 .

3. A low tension shaping process for high elastic dyed polyester woven fabric, used to produce the high elastic dyed polyester woven fabric as claimed in claim 1, characterized in that: In the established gradient temperature-tension coupling field, the grey cloth is crystallized in stages. The gradient temperature-tension coupling field includes a 160°C preheating zone, a 185°C main shaping zone, and a 195°C stabilization zone for the grey cloth to pass through in sequence, and the time for the grey cloth to pass through the preheating zone, the main shaping zone, and the stabilization zone is 30s, 60s, and 30s, respectively; The gradient temperature-tension coupling field also includes a tension control system, which controls the warp tension of the grey cloth to be 50-80N and the weft tension to be 30-50N. The tension control system is equipped with a strain sensor array to monitor the deformation of the grey cloth in real time, and adjusts the warp tension according to the monitoring results of the strain sensor array; In the established stress relaxation-rebalancing system, the grey cloth is subjected to graded cooling and stress release; The stress relaxation-rebalancing system includes a primary slow cooling zone from 190°C to 160°C, a secondary slow cooling zone from 160°C to 100°C, and a tertiary slow cooling zone from 100°C to 50°C, the cooling rates of the primary slow cooling zone and the secondary slow cooling zone are 3°C / s and 1°C / s respectively, and the tertiary slow cooling zone adopts spray cooling; the stress relaxation-rebalancing system also includes a rotary swing frequency mechanism, which is used to apply periodic strain to the grey cloth; A chemical-physical synergistic modification mechanism is established, wherein a SiO2-PDMS composite sol with a particle size of no more than 30 nm is sprayed in the preheating zone, nano-SiO2 constructs a mesoporous structure in the fiber amorphous region of the grey cloth, and the PDMS flexible chain segments are inserted into the gaps in the crystal region to form a "rigid-flexible" interpenetrating network; A multi-physical field coupling mechanism is established, and a plurality of infrared thermal imagers are respectively arranged in the main molding area and the stabilization area. When the infrared thermal imager detects that the local temperature of the grey cloth is greater than a first set value, the nitrogen curtain arranged at the corresponding position is started; a plurality of spectrophotometers are arranged at intervals on the path through which the grey cloth passes, and the injection amount of the SiO2-PDMS composite sol is adjusted when the DE values ​​of multiple consecutive detection points are greater than a second set value.

4. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: The preheating zone adopts far infrared radiation heating, which penetrates 5-8 μm into the fiber surface of the grey cloth.

5. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: Nitrogen was introduced into the main shaping zone to make the oxygen content less than 50 ppm.

6. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: The warp tension and weft tension of the grey cloth are respectively provided by two groups of cloth clip chain machines distributed along the warp direction of the grey cloth and along the weft direction of the grey cloth, wherein one group of cloth clip chain machines distributed along the warp direction of the grey cloth responds to the piezoelectric ceramics in the strain sensor array to automatically adjust the warp tension.

7. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: The three-stage slow cooling zone adopts spray cooling, and the droplet size is less than 20 μm.

8. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: The frequency of the rotary pendulum frequency mechanism is 5-15 Hz, and the amplitude of the rotary pendulum frequency mechanism is 0.5-1.5% of the circumference.

9. The low tension shaping process for high elastic dyed polyester woven fabric according to claim 3, characterized in that: The injection amount of SiO2-PDMS composite sol injected into the preheating zone is 0.5-1.2g / m 2 , so that its penetration depth on the fiber surface of the grey cloth is greater than 80μm.

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