A short process dyeing and finishing method of regenerated polyester fiber elastic knitted fabric blank

Abstract

The application discloses a short-process dyeing and finishing production method of a regenerated polyester fiber elastic knitted fabric blank, and belongs to the technical field of knitted fabric printing and dyeing processing. The regenerated polyester fiber elastic knitted fabric blank is put into a dyeing solution, and then the temperature is raised to 75-85 DEG C at a speed of 1.5-2.5 DEG C / min, and the temperature is kept for 15-25 min; the temperature is continuously raised to 125-135 DEG C, and the temperature is kept for 25-35 min; the temperature is reduced to 55-65 DEG C, and the color is checked by sampling; and when the color is qualified, the dyeing solution is not discharged. The dyeing residual solution is used for reduction cleaning, then the dyeing solution is discharged, and the fabric is taken out by using acetic acid neutralization; the fabric is shaped, and the shaping process temperature is 175-195 DEG C. The application has the beneficial effects that: under the premise of guaranteeing the quality requirements of excellent color fastness, smooth fabric surface, no color flower, no oil stain and the like of the regenerated polyester fiber elastic knitted fabric, the target of water saving, emission reduction, energy consumption reduction and carbon emission reduction of the regenerated polyester fiber fabric dyeing and finishing production is simply and effectively achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of knitted fabric dyeing and printing, in particular to a short process dyeing and finishing production method of regenerated polyester fiber elastic knitted grey fabric. BACKGROUND

[0002] Recycled polyester fiber is one of the important ways for China's chemical fiber industry and even the textile industry to achieve low carbon emission and sustainable development. The current main source of regenerated polyester raw materials is waste polyester bottles, sheets, films, polyester block materials, waste silk, polyester fiber clothing and other waste polyester fiber production. Turning waste into treasure can not only solve the problem of raw material source of polyester fiber, but also alleviate the pressure of garbage disposal of most polyester fiber waste clothing, waste plastic bottles and other garbage.

[0003] The patent application with publication number CN110055769A discloses a dyeing method of regenerated polyester fiber fabric, which includes a pretreatment stage, a dyeing stage and a washing and setting stage. The pretreatment stage includes the following steps: a1, sending the grey fabric to be dyed composed of regenerated polyester fiber into the dyeing bath of the dyeing machine; a2, adding soda ash, oil removal agent and softener into the dyeing bath, and heating the bath liquid in the dyeing bath to 110±3℃, and keeping the temperature for 30±3min; a3, washing the grey fabric treated by step a2 in circulating water, and naturally cooling the bath liquid in the dyeing bath to room temperature, and making the bath liquid in the dyeing bath show weak alkaline property. It sets a pretreatment process before dyeing, and multiple heating and cooling occurs during the dyeing process, which is complex, consumes a large amount of water and has high energy consumption.

[0004] In view of this, the present inventors have carried out in-depth research on this demand, and thus the present application is produced. SUMMARY

[0005] In order to overcome the problems of poor dyeing and finishing effect of regenerated polyester fiber elastic knitted grey fabric, large wastewater discharge and high energy consumption in the prior art, the present application provides a dyeing and finishing production method of elastic knitted grey fabric composed of regenerated polyester fiber, which obviously reduces the printing and dyeing energy consumption, and achieves the purpose of saving energy and reducing carbon emission. The specific technical scheme is as follows:

[0006] A short process dyeing and finishing production method of regenerated polyester fiber elastic knitted grey fabric, including the following steps:

[0007] Step one, dyeing, putting the regenerated polyester fiber elastic knitted grey fabric into the dyeing liquid, heating to 75-85℃ at a speed of 1.5-2.5℃ / min, keeping the temperature for 15-25min, continuing to heat to 125-135℃, keeping the temperature for 25-35min, cooling to 55-65℃ for sampling and color matching, and not discharging the liquid after the color is qualified;

[0008] Step two, reduction cleaning, using the residual liquid in step one for reduction cleaning, then draining, then water, using acetic acid to neutralize the cloth;

[0009] Step three, finished product setting, setting process temperature is 175-195℃.

[0010] On the premise of ensuring the dyeing and finishing production of stretch knitted fabric of recycled polyester fiber with excellent color fastness, smooth surface, no color spot, no oil stain and other quality requirements, the target of water saving, emission reduction, energy saving and carbon emission reduction in the dyeing and finishing production of recycled polyester fiber fabric is achieved simply and effectively.

[0011] Here, the dyeing and finishing method is very suitable for dyeing and setting of stretch knitted fabric of recycled polyester fiber, and the required mass dosage of dye is owf≤5.0%, and the new process dyeing of deep colored recycled polyester fiber knitted fabric needs to add one more reduction cleaning due to the fastness requirement.

[0012] Because the breaking strength and breaking elongation of recycled polyester fiber are lower than those of traditional polyester fiber, the stretch knitted fabric composed of recycled polyester fiber and spandex should avoid repeated high temperature heat setting, and reducing heat setting once is also beneficial to ensuring the dyeing and finishing quality of recycled polyester fiber.

[0013] The setting temperature of finished product is increased from about 160℃ to 175-195℃, and 175-195℃ is a temperature range, and the specific temperature should be combined with the unit area mass of the fabric, and the larger the unit area mass of the fabric, the higher the temperature design.

[0014] Preferably, in step one, the stretch knitted fabric of recycled polyester fiber is put into a dyeing solution of 25-30℃, and high temperature oil removal agent, anti-wrinkle agent, emulsifying dispersant, leveling agent and dye are added before the dyeing solution is warmed up, and acetic acid-sodium acetate solution is added to adjust the pH value.

[0015] Preferably, in step one, 1.0-2.0g / l of high temperature oil removal agent, 2.0-3.0g / l of anti-wrinkle agent, 0.5-2.0g / l of emulsifying dispersant, 2.0-3.0% owf of leveling agent and 0-5.0% owf of dye are added before the dyeing solution is warmed up.

[0016] Preferably, in step one, the temperature is increased to 75-85℃ at a speed of 2.0℃ / min for 15-25min, then the temperature is increased to 125-135℃ at a speed of 1.2℃ / min for 25-35min, and then the temperature is decreased to 55-65℃ at a speed of 2.0℃ / min for sampling.

[0017] Preferably, in step two, soda is added to the residual liquid, the temperature is increased to 75-85℃, then sodium hyposulfite is added, the temperature is kept for 25-35min, the temperature is decreased to 50-60℃, then the liquid is drained.

[0018] Preferably, in step two, 1.5-2.5g / l of caustic soda is added to the residual liquid, the temperature is raised to 75-85℃, then 2.0-4.0% owf of sodium hydrosulfite is added, the temperature is maintained for 25-35min, the temperature is lowered to 50-60℃, then the liquid is discharged, clean water is introduced, and 0.5-2.0g / l of acetic acid is used to neutralize the cloth.

[0019] Preferably, in step two, caustic soda is added to the residual liquid, the temperature is raised to 75-85℃ at a rate of 2.5℃ / min, then sodium hydrosulfite is added, the temperature is maintained for 25-35min, the temperature is lowered to 50-60℃ at a rate of 2.0℃ / min, then the liquid is discharged, clean water is introduced, and acetic acid is used to neutralize the cloth.

[0020] Preferably, in step three, the setting process conveying speed is 21-25m / min, and the overfeed is 2-5%.

[0021] Preferably, in step three, the setting process conveying speed is 21-25m / min, and the overfeed is 3%.

[0022] Preferably, in step three, the temperatures of the first eight setting ovens are 185℃, 195℃, 195℃, 195℃, 195℃, 195℃, 195℃, 185℃, respectively; the upper and lower air flow rates are 50-70%; and the oven chain sequence strip is set as:

[0023] 140cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm.

[0024] Beneficial effects:

[0025] The beneficial effects produced by adopting the technical scheme of the present application are as follows:

[0026] (1) On the premise of ensuring that the dyeing and finishing production of stretch knitted fabrics composed of regenerated polyester fibers has excellent color fastness, a smooth surface, no color spots, and no oil stains, etc., the goal of water saving, energy saving, and carbon emission reduction in the dyeing and finishing production of regenerated polyester fiber fabrics is simply and effectively achieved.

[0027] (2) Under the premise of the same quality, water saving, heat energy and time required for one-time high-temperature setting, one-time flat washing time of gray cloth, steam and heating time required for heating one tank of water from room temperature to 60℃, etc. are achieved.

[0028] (3) cancel the traditional process of open-width washing, pre-shaping process, the blank cloth is directly dyed, mainly through appropriate extension of the dyeing 80℃ temperature rising time and holding time, so as to achieve the effect of pre-shrinking of the blank cloth in the dyeing cylinder before dyeing; also adjust the temperature rising speed of the front section from 3℃ / min to 2℃ / min, while holding at 80℃ for 20min, which is 15min longer than before, which not only meets the requirement of rapid temperature rising, but also reserves a certain time for relaxation of regenerated polyester fiber knitted blank.

[0029] (4) by adding high-temperature oil removal agent, emulsifying dispersant and high-temperature anti-wrinkle agent in the dyeing cylinder, the effect of dyeing, oil removal and anti-wrinkle is achieved, and the shortcomings of conventional oil removal agent, such as emulsion breaking caused by high temperature, dispersion dye aggregation and easy to produce stains, are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation to the scope, for those skilled in the art, on the premise of not paying creative labor, other related drawings can also be obtained according to these drawings.

[0031] Figure 1 is the dyeing process flow chart of the preferred knitted blank cloth of the present application;

[0032] Figure 2 is the dyeing temperature rising process curve chart in example 1;

[0033] Figure 3 is the reduction cleaning temperature rising process curve chart in example 1;

[0034] Figure 4 is the dyeing temperature rising process curve chart in comparative example 1;

[0035] Figure 5 is the reduction cleaning temperature rising process curve chart in comparative example 1. DETAILED DESCRIPTION

[0036] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] As shown in Figure 1 A short process dyeing and finishing production method of a regenerated polyester fiber elastic knitted fabric blank, comprising the following steps:

[0038] Step S101, dyeing, putting the regenerated polyester fiber elastic knitted fabric blank into a dyeing solution, heating to 75-85℃ at a speed of 1.5-2.5℃ / min, then keeping the temperature for 15-25min, continuing to heat to 125-135℃ and keeping the temperature for 25-35min, cooling to 55-65℃ for sampling and color matching, and discharging the solution after the color is qualified;

[0039] Step S102, reduction cleaning, using the residual solution in step one for reduction cleaning, then discharging the solution, and using clean water, and using acetic acid to neutralize the fabric;

[0040] Step S103, product setting, the setting process temperature is 175-195℃.

[0041] The pre-setting process in the traditional process is cancelled, mainly adjusting the product setting process, and the product setting temperature is increased from the traditional temperature of about 160℃ to 175-195℃, and the one-time setting can meet the internal quality requirements such as flat fabric surface, specifications and stretching, and at the same time, because the regenerated polyester fiber knitted fabric cannot be heat finished as well as the ordinary polyester fiber, and the breaking strength and breaking elongation of the regenerated polyester fiber are lower than those of the traditional polyester fiber, omitting the one-time heat setting is beneficial to the elastic quality of the regenerated polyester fiber knitted fabric.

[0042] As a preferred embodiment, in step S101, the regenerated polyester fiber elastic knitted fabric blank is put into a dyeing solution at 25-30℃, and high-temperature oil removal agent, anti-wrinkle agent, emulsifying dispersant, leveling agent and dye are added before the dyeing solution is heated, and acetic acid-sodium acetate solution is added to adjust the pH value.

[0043] As a preferred embodiment, in step S101, 1.0-2.0g / l of high-temperature oil removal agent, 2.0-3.0g / l of anti-wrinkle agent, 0.5-2.0g / l of emulsifying dispersant, 2.0-3.0%owf of leveling agent and 0-5.0%owf of dye are added before the dyeing solution is heated.

[0044] As a preferred embodiment, in step S101, after the temperature is raised to 75-85°C at a rate of 2.0°C / min and maintained for 15-25 min, the temperature is continued to be raised to 125-135°C at a rate of 1.2°C / min and maintained for 25-35 min, and then the temperature is lowered to 55-65°C at a rate of 2.0°C / min and sampling is performed.

[0045] As a preferred embodiment, in step S102, soda is added to the residual liquid, and after the temperature is raised to 75-85°C, sodium bisulfite is added, and maintained for 25-35 min, and then the temperature is lowered to 50-60°C, and then the liquid is discharged.

[0046] As a preferred embodiment, in step S102, 1.5-2.5 g / l of soda is added to the residual liquid, and after the temperature is raised to 75-85°C, 2.0-4.0% owf of sodium bisulfite is added, and maintained for 25-35 min, and then the temperature is lowered to 50-60°C, and then the liquid is discharged, and clean water is introduced, and 0.5-2.0 g / l of acetic acid is used to neutralize the cloth.

[0047] As a preferred embodiment, in step S102, soda is added to the residual liquid, and after the temperature is raised to 75-85°C at a rate of 2.5°C / min, sodium bisulfite is added, and maintained for 25-35 min, and then the temperature is lowered to 50-60°C at a rate of 2.0°C / min, and then the liquid is discharged, and clean water is introduced, and acetic acid is used to neutralize the cloth.

[0048] As a preferred embodiment, in step S103, the conveying speed of the setting process is 21-25 m / min, and the overfeed is 2-5%.

[0049] As a preferred embodiment, in step S103, the conveying speed of the setting process is 21-25 m / min, and the overfeed is 3%.

[0050] As a preferred embodiment, in step S103, the temperatures of the first 8 setting ovens are 185°C, 195°C, 195°C, 195°C, 195°C, 195°C, 195°C, and 185°C, respectively; the upper and lower air flow rates are 50-70%; and the oven chain sequence strip is set as:

[0051] 140 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm.

[0052] The beneficial effects of the dip dyeing process in the present embodiment are further described below through examples and comparative examples.

[0053] Example 1:

[0054] As Figure 2 and 3As shown in the figure, a dyeing and finishing production method comprises the following steps:

[0055] Step one, dyeing, put the regenerated polyester fiber elastic knitted fabric blank into a dyeing solution at 25-30°C, add 1.0-2.0 g / l of high-temperature oil removal agent, 2.0-3.0 g / l of anti-wrinkle agent, 0.5-2.0 g / l of emulsified dispersant, 2.0-3.0% owf of leveling agent, and 0-5.0% owf of dye, add acetic acid-sodium acetate solution to adjust the pH value; heat to 80°C at a rate of 2.0°C / min, keep for 20 min, continue to heat to 130°C at a rate of 1.2°C / min, keep for 30 min, cool to 60°C at a rate of 2.0°C / min, take a sample for color matching, and after the color is qualified, do not drain the liquid; the time consumption is about 160 min.

[0056] Step two, reduction cleaning, add 2.0 g / l of flake alkali to the residual liquid, heat to 80°C at a rate of 2.5°C / min, add 3.0% owf of sodium hydrosulfite, keep for 30 min, cool to 55°C at a rate of 2.0°C / min, then drain the liquid, enter clean water, and use 1.0 g / l of acetic acid to neutralize the fabric; the time consumption is about 70 min.

[0057] Step three, product setting, the setting process temperature is 175-195°C, the setting process conveying speed is 21-25 m / min, and the overfeed is 3%; the time consumption is 12.5 min.

[0058] The temperatures of the first eight setting ovens are 185°C, 195°C, 195°C, 195°C, 195°C, 195°C, 195°C, and 185°C, respectively; the upper and lower air flow rates are 50-70%; and the oven chain sequence strip is set as: 140 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm-145 cm. Comparative Example 1:

[0059] As shown in the figure, Figure 4 and 5 a dyeing and finishing production method comprises the following steps:

[0060] Step one, open-width washing, the standard water amount, water temperature, and materials in the preheating tank and washing tank are shown in Table 1; because the open-width washing is a continuous production mode, the water and additives are reused, so only the saved production time is calculated when calculating, according to the speed of 25 m / min, 100 kg of blank fabric, the conventional fabric width is 1.60 M, and the grammage is 200 g / m2 (all subsequent comparisons are made according to this specification and quality), the time consumption is 12.5 min.

[0061] Step two, pre-setting, temperature 190-195℃, machine running speed 25m / min, overfeed 3%; because the speed is 25m / min, according to the calculation of 100kg of base cloth processing, the time consumption is 12.5min.

[0062] Step three, dyeing, the regenerated polyester fiber elastic knitted base cloth is put into a dyeing solution at 25-30℃, 1.0-2.0g / l of dispersing agent, 2.0-3.0%owf of leveling agent and 0-5.0%owf of dye are added, and acetic acid-sodium acetate solution is added to adjust the pH value; after running for 5min, the temperature is raised to 80℃ at a speed of 3.0℃ / min, and kept for 5min, then the temperature is raised to 130℃ at a speed of 1.0℃ / min and kept for 30min, and then the temperature is lowered to 60℃ at a speed of 2.0℃ / min for sampling and color matching, and the liquid is discharged after the color is qualified; the dyeing time consumption is about 150min.

[0063] Step four, reduction cleaning, 28℃ normal temperature water is added, and 1.5g / l of sodium hydroxide is added, and then the temperature is raised to 80℃ at a speed of 2.5℃ / min, 3.0% of sodium hydrosulfite is added, the temperature is kept at 80℃ for 30min, the temperature is lowered to 55℃ at a speed of 2.0℃ / min, then the residual liquid is discharged, and the cloth is washed with clean water, and 1.0g / l of acetic acid is used to neutralize the cloth; the time consumption is about 90min.

[0064] Step five, product setting, the setting process temperature is 140-180℃, the setting process conveying speed is 25m / min, and the overfeed is 3%; the time consumption is about 12.5min.

[0065] Table 1, the open-width washing process in Comparative Example 1

[0066]

[0067] The basic reduction cleaning process in Comparative Example 1 needs 2 tanks of water, and the theoretical time length needs about 90min; while the reduction cleaning two-step method in Example 1 saves 20min of production time, saves one dyeing tank of water, and saves the steam needed for heating one dyeing tank of water.

[0068] Dyeing and finishing time comparison:

[0069] The total time length of the dyeing and finishing process in Comparative Example 1 is about 277.5min, including 12.5min of open-width washing time, 12.5min of pre-setting time, about 150min of dyeing time, about 90min of reduction cleaning time, and about 12.5min of product setting time.

[0070] The total time length of the dyeing and finishing process in Example 1 is about 242.5min, including about 160min of dyeing time, about 70min of reduction cleaning time, and about 12.5min of product setting time.

[0071] Example 1 and Comparative Example 1, a total of 35 min is saved, saving time 12.6%.

[0072] Required thermal energy:

[0073] In Comparative Example 1, the open-width washing and dyeing workshop uses 0.5 MPa low-pressure steam at a speed of 1.0 tons / hour, and the heat content value is 2748 KJ / kg. It is roughly calculated that the thermal energy consumed in one hour is 2748000 KJ. According to the time speed of 1.1 tons / hour of medium-pressure steam in the setting workshop, and according to the actual steam 2.4 MPa medium-pressure steam, the heat content value is 2800 KJ / kg, and it is calculated that the thermal energy consumed in one hour is 3080000 KJ, and the saving of 20 min is about 1026666.KJ of thermal energy. The calculation is as follows:

[0074] Open-width washing (12.5 min) + pre-setting (12.5 min) + dyeing (150 min) + reduction cleaning (90 min) + product setting (12.5 min) = 12847833 KJ.

[0075] In Example 1, the thermal energy consumed in dyeing and finishing process: dyeing (160 min) + reduction cleaning (70 min) + product setting (12.5 min) = 11178666 KJ.

[0076] Example 1 and Comparative Example 1, a total of 13.0% of thermal energy is saved.

[0077] Consumed electric energy comparison:

[0078] In Comparative Example 1, open-width washing (120 kilowatt hours*12.5 min=25 KW) + pre-setting (220 kilowatt hours*12.5 min=45.8 KW) + dyeing (26 kilowatt hours*150 min=65 KW) + reduction cleaning (26 kilowatt hours*90 min=39 KW) + product setting (220 kilowatt hours*12.5 min=45.8 KW) = 220.6 KW.

[0079] In Example 1, dyeing (26 kilowatt hours*160 min=69.3 KW) + reduction cleaning (26 kilowatt hours*70 min=30.3 KW) + product setting (220 kilowatt hours*12.5 min=45.8 KW) = 145.4 KW.

[0080] Example 1 and Comparative Example 1, a total of 34.1% of thermal energy is saved.

[0081] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank, characterized in that, The method comprises the following steps: Step one, dyeing, putting the regenerated polyester fiber elastic knitted fabric blank into a dyeing solution at 25-30℃, and adding high-temperature oil removal agent, anti-wrinkle agent, emulsifying dispersing agent, leveling agent and dye before the dyeing solution is warmed up, adding acetic acid-sodium acetate solution to adjust the pH value, warming up to 75-85℃ at a speed of 1.5-2.5℃ / min, keeping warm for 15-25min, continuously warming up to 125-135℃, keeping warm for 25-35min, and cooling down to 55-65℃ to take sample for color matching, and discharging the solution after the color is qualified; Step two, reduction cleaning, using the residual solution in step one for reduction cleaning, then discharging the solution, feeding clean water, and using acetic acid to neutralize the fabric; Step three, product setting, the setting process temperature is 175-195℃.

2. A short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step one, 1.0-2.0g / l of high-temperature oil removal agent, 2.0-3.0g / l of anti-wrinkle agent, 0.5-2.0g / l of emulsifying dispersing agent, 2.0-3.0% owf of leveling agent and 0-5.0% owf of dye are added before the dyeing solution is warmed up.

3. A short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step one, after warming up to 75-85℃ at a speed of 2.0℃ / min and keeping warm for 15-25min, the temperature is continuously increased to 125-135℃ at a speed of 1.2℃ / min and kept for 25-35min, and then the temperature is decreased to 55-65℃ at a speed of 2.0℃ / min to take sample.

4. The short process dyeing and finishing method of the regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step two, piece alkali is added in the residual solution, the temperature is increased to 75-85℃, then safety powder is added, the temperature is kept for 25-35min, the temperature is decreased to 50-60℃, and then the solution is discharged.

5. The short process dyeing and finishing method of the regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step two, 1.5-2.5g / l of piece alkali is added in the residual solution, the temperature is increased to 75-85℃, then 2.0-4.0% owf of safety powder is added, the temperature is kept for 25-35min, the temperature is decreased to 50-60℃, then the solution is discharged, clean water is fed, and 0.5-2.0g / l of acetic acid is used to neutralize the fabric.

6. The short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step two, piece alkali is added in the residual solution, the temperature is increased to 75-85℃ at a speed of 2.5℃ / min, then safety powder is added, the temperature is kept for 25-35min, the temperature is decreased to 50-60℃ at a speed of 2.0℃ / min, then the solution is discharged, clean water is fed, and acetic acid is used to neutralize the fabric.

7. The short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank according to claim 1, characterized in that, In step three, the setting process conveying speed is 21-25m / min, and the overfeed is 2-5%.

8. A short process dyeing and finishing method of a regenerated polyester fiber elastic knitted fabric blank according to claim 7, characterized in that, In step three, the setting process conveying speed is 21-25m / min, and the overfeed is 3%.

9. The short-process dyeing and finishing method for recycled polyester fiber elastic knitted fabric according to claim 1, characterized in that, In step three, the temperatures of the first eight setting ovens are 185℃, 195℃, 195℃, 195℃, 195℃, 195℃, 195℃ and 185℃ in sequence, the upper and lower air volume is 50-70%, and the oven chain sequence strip is set as: 140cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm-145cm.

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