Supercritical carbon dioxide dyeing system having online detection function, and online detection method

Abstract

Disclosed are a supercritical carbon dioxide dyeing system having an online detection function, and an online detection method. The system comprises a dyeing autoclave and a spectrophotometer, wherein the spectrophotometer comprises a detection probe, a data cable and a spectrophotometer main unit; a detection port is formed in the autoclave wall of the dyeing autoclave; the detection probe is mounted at the detection port; the detection probe transmits color information of dyed cloth in the dyeing autoclave to the spectrophotometer main unit by means of the data cable; and the spectrophotometer main unit detects the color of the dyed cloth in the dyeing autoclave on line. In the present application, by mounting the detection probe in the spectrophotometer on the autoclave wall of the dyeing autoclave, the online color detection of the dyed cloth in the dyeing autoclave is realized, reducing the number of loadings and unloadings of the dyed cloth, thereby solving the problems in the prior art of large labor amount and low dyeing working efficiency. In the online detection method of the present application, a standard sample is placed in the dyeing autoclave for detection, so as to ensure that a detection environment for color parameters of the standard sample is identical to an online detection environment, thereby improving the accuracy of online detection.

Description

Online detection type supercritical carbon dioxide dyeing system and online detection method TECHNICAL FIELD

[0001] The present application relates to the technical field of supercritical carbon dioxide dyeing equipment, in particular to an online detection type supercritical carbon dioxide dyeing system and an online detection method. BACKGROUND

[0002] Supercritical carbon dioxide fluid dyeing is an environmentally friendly technology that has attracted much attention in the current dyeing process. Generally, when the temperature and pressure of a substance exceed the critical temperature and critical pressure, it will enter the state of supercritical fluid. Supercritical fluid has the characteristics of low viscosity, high diffusion coefficient and low surface tension like gas, and also has the characteristics of high density and high solubility like liquid, and different substances will have different chemical properties after forming supercritical fluid. The solubility of carbon dioxide supercritical fluid to substances will change with the change of the temperature and pressure of the environment, and carbon dioxide can increase lipophilicity after entering the supercritical fluid state, thereby having the ability to dissolve organic matter. Therefore, supercritical carbon dioxide can dissolve non-polar dyes, and then through the low surface tension characteristics of supercritical fluid, it can easily penetrate into porous tissues. Carbon dioxide supercritical fluid dyeing does not need to use water as a medium and is non-toxic, which can solve the environmental pollution caused by the existing dyeing process.

[0003] Polyester synthetic chemical long fiber textile fabric, in the traditional water medium dyeing process (belongs to chemical reaction dyeing), nylon needs to use about 60% acid auxiliary mixed colorant to adhere to color, polyester uses about 50% dispersion auxiliary mixed colorant to adhere to dyeing. The supercritical carbon dioxide fluid (gas medium instead of water medium) belongs to the colorant mixed fluid filled with colorant to achieve the color effect, which uses micron-level high-density fine primary color masterbatch as colorant, belongs to physical filling coloring, and does not distinguish the fiber composition attribute and needs to use auxiliary to adjust the affinity of coloring. For dyeing process, each time the large cargo dyeing is according to the colorant formula, according to the weight proportion of the dyeing fabric, the colorant is put into the dyeing kettle, the supercritical carbon dioxide mixed colorant fluid (belongs to the atomized superhigh pressure fluid), which is not in liquid state, after the coloration process is completed, the pressure is released, in principle, the colorant in the dyeing kettle has been used up, because the colorant powder is only suspended in the fluid, the fluid is discharged to low pressure, the carbon dioxide is restored to gas, and after filtration in the separation kettle, the pure carbon dioxide is pressurized to subcritical at normal temperature and recycled to flush, the residual floating color powder on the fabric is removed, the temperature is lowered, the pressure is released, and the kettle is evacuated to normal atmospheric pressure, and detection before the kettle is discharged is a necessary link. The traditional water dyeing is to cut small fabric pieces to dry and check the color, which is due to many reasons such as fabric type, yarn count, weaving style, weaving process, colorant compatibility, pipe bends, tees, valve scale and the like, which can cause the color of the fabric to not reach the expected value, so the detection of the dyed fabric is needed. Since the dyed fabric is in the dyeing kettle, it is very dark and has no light, and the dyeing kettle is in a high temperature and high pressure working environment during the dyeing process, so the supercritical carbon dioxide dyeing system currently does not have an online detection function. In the prior art, when the color of the dyed fabric is detected, the dyed fabric is taken out from the dyeing kettle after the dyeing process of the supercritical carbon dioxide dyeing system is completed, and then the color of the dyed fabric is detected in the environment outside the kettle. When it is found that the dyed fabric does not meet the requirements, the fabric needs to be put into the dyeing kettle again for secondary dyeing treatment. The above detection method has great disadvantages, such as large labor intensity and low dyeing work efficiency. SUMMARY

[0004] The purpose of the present application is to provide an online detection type supercritical carbon dioxide dyeing system and an online detection method to solve the problem of large labor intensity and low dyeing work efficiency in the prior art.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] The online detection type supercritical carbon dioxide dyeing system comprises a dyeing kettle and a spectrophotometer, the spectrophotometer comprises a detection probe, a data line and a spectrophotometer main body, a detection port is formed in the kettle wall of the dyeing kettle, the detection probe is installed at the detection port, the detection probe transmits the color information of the dyed cloth in the dyeing kettle to the spectrophotometer main body through the data line, and the spectrophotometer main body performs online detection on the color of the dyed cloth in the dyeing kettle.

[0007] Further, the detection probe comprises a high-temperature and high-pressure light-transmitting plate, a sealing ring, a probe shell, a condenser lens cover, a scattering light source and a light information sensor, the center of the condenser lens cover is provided with a reflected light passing hole, the reflected light passing hole is provided with a light filtering device, a plurality of light source mounting holes are distributed along the periphery of the reflected light passing hole on the condenser lens cover, the scattering light source is mounted at the light source mounting hole, the condenser lens cover is arranged in the probe shell, the probe shell is fixed on the dyeing kettle, and the light information sensor is arranged in the probe shell and located above the light filtering device; the high-temperature and high-pressure light-transmitting plate and the sealing ring are arranged in the detection port; the light emitted by the scattering light source passes through the condenser lens cover to form a condensing light, the condensing light passes through the high-temperature and high-pressure light-transmitting plate to irradiate on the dyed cloth in the dyeing kettle, the reflected light of the dyed cloth passes through the light filtering device to irradiate on the light information sensor, and the light information sensor transmits to the spectrophotometer main body through the data line.

[0008] Further, the detection port is a circular hole provided with an internal thread, an annular boss is arranged in the detection port, the sealing ring is arranged on the annular boss, the high-temperature and high-pressure light-transmitting plate is pressed on the sealing ring, and an annular pressing plate with an external thread is matched with the internal thread of the detection port to press and fix the high-temperature and high-pressure light-transmitting plate.

[0009] Further, the scattering light source is an LED lamp or a xenon lamp.

[0010] Further, the light information sensor is a fiber probe, and the data line is a light guide fiber bundle, the reflected light received by the light information sensor is transmitted through the light guide fiber bundle.

[0011] Further, the system further comprises a dye kettle, the dye kettle is provided with a red, yellow and blue three primary color mixer, the red, yellow and blue three primary color mixer is used for mixing micron-level color master dyes of different colors, and the mixed micron-level color master dyes are sent into the dye kettle, and the dye kettle is communicated with the dyeing kettle through a pipeline.

[0012] Further, the dyed cloth is a micro-honeycomb cloth implanted with electric charges through a micro-honeycomb electric charge technology, and the micron-level color master dye has electric charges which are attracted to the electric charges on the dyed cloth.

[0013] Further, the online detection type supercritical carbon dioxide dyeing system further comprises a circulating storage tank, a cooler, a high-pressure pump, a heater, an evaporator, a resolving kettle and a condenser, the circulating storage tank is used to store carbon dioxide gas, the carbon dioxide gas in the circulating storage tank sequentially passes through the cooler, the high-pressure pump and the heater, and becomes high-temperature supercritical fluid, the high-temperature supercritical fluid enters the dyeing kettle, passes through the cloth to be dyed, and then the high-temperature supercritical fluid flowing out of the dyeing kettle sequentially passes through the evaporator and the resolving kettle, the micron-sized color master dye separated is recycled for standby use, and the separated carbon dioxide gas is sent into the circulating storage tank through the condenser.

[0014] The method for online detection by using the online detection type supercritical carbon dioxide dyeing system comprises the following steps:

[0015] S1, obtaining the color parameter of a standard sample: the dyed cloth with a color meeting the requirements is taken as a standard sample and is placed into the dyeing kettle, the color parameter of the standard sample is obtained by the spectrophotometer through the detection probe, and the standard sample is taken out of the dyeing kettle after the detection is completed;

[0016] S2, preparing the micron-sized color master dye: the pre-dyed cloth is placed into the dyeing kettle, the red, yellow and blue three primary color controllers are regulated according to the color parameter of the standard sample detected outside the dyeing kettle, the micron-sized color master dye with the required color is prepared, and the prepared micron-sized color master dye is sent into the dyeing kettle;

[0017] S3, cloth dyeing: the supercritical carbon dioxide dyeing system is started, the pre-dyed cloth is subjected to supercritical carbon dioxide dyeing, the dyeing kettle is depressurized after the dyeing process is completed, and the pre-dyed cloth is circularly flushed with high-pressure and normal-temperature pure carbon dioxide to remove the residual floating powder on the cloth, the dyeing kettle is depressurized again to make the dyeing kettle in the state of the external normal atmospheric pressure;

[0018] S4, obtaining the color parameter of the dyed cloth: the spectrophotometer is started, and the color parameter of the dyed cloth in the dyeing kettle is obtained by the spectrophotometer through the detection probe;

[0019] S5, judging whether the color of the dyed cloth is qualified: the color parameter of the dyed cloth is compared with the color parameter of the standard sample, if the difference between the two is within a predetermined range, the color of the dyed cloth is qualified, and the dyed cloth is taken out of the dyeing kettle, if the difference between the two exceeds the predetermined range, the color of the dyed cloth is unqualified, and the dyed cloth in the dyeing kettle is subjected to secondary dyeing treatment.

[0020] Further, in the step S1, the spectrophotometer adopts the L*a*b coordinate system to represent different colors, and the color parameter of the L*a*b coordinate system is as follows: L: the lightness axis, representing black and white, 0 is black and 100 is white;

[0021] a: red-green axis, positive value for red, negative value for green, 0 for neutral; b: yellow-blue axis, positive value for yellow, negative value for blue, 0 for neutral;

[0022] In the step S5, the predetermined range is -2≤ΔL≥2; -1≤Δa≥1; -1≤Δa≥1; -2≤ΔEab≥2; wherein, ΔL=L sample-L standard; Δa=a sample-a standard; Δb=b sample-b standard; ΔEab=ΔL+Δa+Δb, ΔEab is the total color difference.

[0023] The present application has the following beneficial effects:

[0024] The present application installs the detection probe in the spectrophotometer on the wall of the dyeing kettle, realizes online color detection of the dyed cloth in the dyeing kettle, and reduces the mounting and unloading times of the dyed cloth, so as to solve the problems of large labor amount and low dyeing work efficiency in the prior art.

[0025] In the online detection method of the present application, the standard sample is placed in the dyeing kettle for detection before dyeing, so that the detection environment of the color parameters of the standard sample is the same as the online detection environment, and the precision of online detection is greatly improved.

[0026] The online detection environment of the present application is very special, the inside of the dyeing kettle is a high-temperature and high-pressure environment before detection, and there is almost no light in the dyeing kettle, which is very dark. The detection probe with a conventional integrating sphere structure cannot meet the requirements of color detection. The detection probe in the present application changes the scattered light illumination into spotlight illumination to improve the illumination effect in the dyeing kettle.

[0027] The light filtering device in the present application is replaceable. The light filtering device can make the spectrum of the reflected light received by the detection probe reach the most ideal state, and achieve the best detection effect. By replacing the light filtering device, the spectral power distribution can be adjusted according to the detection needs without replacing the light source. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application is further described by using the drawings, but the embodiments in the drawings do not constitute any limitation on the present application. For ordinary skilled persons in the art, other drawings can be obtained without creative labor on the basis of the following drawings:

[0029] Fig. 1 is a structural schematic diagram of an online detection type supercritical carbon dioxide dyeing system according to the present application;

[0030] Fig. 2 is a structural schematic diagram of a detection probe shown in Fig. 1;

[0031] Fig. 3 is a flow chart of an online detection method according to the present application.

[0032] In the figure: 1, dyeing kettle; 2, circulating storage tank; 3, cooler; 4, high-pressure pump; 5, heater; 6, evaporator; 7, resolving kettle; 8, condenser; 9, dye kettle; 10, carbon dioxide storage tank; 11, delivery plunger pump; 12, detection probe; 13, data line; 14, spectrophotometer main body; 15, detection port; 16, red, yellow and blue three primary color matching device; 17, sealing ring; 18, probe shell; 19, light shield; 20, scattered light source; 21, light information sensor; 22, reflected light through hole; 23, light filtering device; 24, light source mounting hole; 25, annular boss; 26, annular pressing plate with external thread; 27, high-temperature and high-pressure light-transmitting plate; 28, circulating pump; 29, circulating heater. DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments, and it should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward rotation", "reverse rotation", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] As shown in FIG. 1, the on-line detection type supercritical carbon dioxide dyeing system includes a dyeing kettle 1 and a spectrophotometer,

[0036] It also includes a circulating storage tank 2, a cooler 3, a high-pressure pump 4, a heater 5, an evaporator 6, a resolving kettle 7, and a condenser 8. The circulating storage tank 2 is used to store carbon dioxide gas. The carbon dioxide gas in the circulating storage tank 2 passes through the cooler 3, the high-pressure pump 4, and the heater 5 in sequence, and becomes a high-temperature supercritical fluid. The high-temperature supercritical fluid enters the dyeing kettle 1 and passes through the cloth to be dyed, and then the high-temperature supercritical fluid flows out of the dyeing kettle 1 and passes through the evaporator 6 and the resolving kettle 7 in sequence. The micron-sized color master dye separated after passing through the evaporator 6 and the resolving kettle 7 is recovered for standby use, and the separated carbon dioxide gas is sent to the circulating storage tank 2 through the condenser 8. The system also includes a carbon dioxide storage tank 10 and a delivery plunger pump 11. The delivery plunger pump 11 sends the carbon dioxide gas in the carbon dioxide storage tank 10 to the pipeline of the supercritical carbon dioxide dyeing system.

[0037] In addition, a dyeing kettle 9 is further included, and a red-yellow-blue three primary color mixer 16 is arranged on the dyeing kettle 9, which is used to mix different color micron-sized color master dyes, and send the mixed micron-sized color master dyes into the dyeing kettle 9, and the dyeing kettle 9 is communicated with the dyeing kettle 1 through a pipeline.

[0038] In the embodiment, two dyeing kettles 1 are arranged in parallel, and of course, 3-6 dyeing kettles 1 can be arranged in parallel according to the working requirement, and each dyeing kettle 1 is provided with a circulating pump 28 and a circulating heater 29, and the circulating pump 28 and the circulating heater 29 form a supercritical fluid circulating system with the dyeing kettle 1. During the dyeing process, the circulating pump 28 can rotate in the forward and reverse directions, so that the supercritical fluid flows in the forward and reverse directions, so as to improve the dyeing efficiency.

[0039] The spectrophotometer includes a detection probe 12, a data line 13 and a spectrophotometer main body 14, a detection port 15 is arranged on the kettle wall of the dyeing kettle 1, the detection probe 12 is arranged at the detection port 15, the detection probe 12 transmits the color information of the dyed cloth in the dyeing kettle 1 to the spectrophotometer main body 14 through the data line 13, and the spectrophotometer main body 14 performs online detection on the color of the dyed cloth in the dyeing kettle 1. The detection probe in the spectrophotometer is arranged on the kettle wall of the dyeing kettle, so that the online color detection of the dyed cloth in the dyeing kettle is realized, and the mounting and unloading times of the dyed cloth are reduced, so as to solve the problems of large labor amount and low dyeing work efficiency in the prior art.

[0040] As shown in FIG. 2, the detection probe 12 includes a high-temperature and high-pressure light-transmitting plate 27, a sealing ring 17, a probe shell 18, a condenser lens cover 19, a scattering light source 20 and a light information sensor 21, a reflective light passing hole 22 is arranged at the center of the condenser lens cover 19, a light filtering device 23 is arranged at the reflective light passing hole, a plurality of light source mounting holes 24 are arranged on the condenser lens cover 19 along the periphery of the reflective light passing hole 22, the scattering light source 20 is arranged at the light source mounting hole 24, the condenser lens cover 19 is arranged in the probe shell 18, the probe shell 18 is fixed on the dyeing kettle 1, and the light information sensor 21 is arranged in the probe shell 18 and located above the light filtering device 23; the high-temperature and high-pressure light-transmitting plate 27 and the sealing ring 17 are arranged in the detection port 15, so as to seal the detection port 15; the light emitted by the scattering light source 20 passes through the condenser lens cover 19 to form a condensing light, and the condensing light irradiates the dyed cloth in the dyeing kettle 1 through the high-temperature and high-pressure light-transmitting plate 27, the reflective light of the dyed cloth is filtered by the light filtering device 23 and then irradiates the light information sensor 21, and the light information sensor 21 transmits the light information to the spectrophotometer main body 14 through the data line 13.

[0041] Since the detected object is the cloth in the dyeing kettle 1, the detection environment in the dyeing kettle 1 is quite different from the detection environment outside the dyeing kettle 1, and there is almost no light in the dyeing kettle 1, which is very dark, so the detection probe 12 does not adopt the technical scheme of the conventional integrating sphere, but adopts the light condensing cover 19 to improve the brightness in the dyeing kettle 1 through light condensing of the light condensing cover 19.

[0042] The light filtering device 23 is replaceable, and through the light filtering device 23, the spectrum of the reflected light can reach the most ideal state, and the best detection effect can be achieved. Through replacement of the light filtering device 23, the spectral power distribution can be adjusted according to the detection needs without replacing the light source.

[0043] The above-mentioned scattering light source adopts an LED lamp, which can not only save electric energy, but also simplify the circuit.

[0044] The light information sensor 21 is a fiber probe, and the data line 13 is a light guide fiber bundle. The fiber probe transmits the received reflected light through the light guide fiber bundle, so that the light information transmission is faster, and the photoelectric signal conversion is not necessary.

[0045] The detection port 15 is a circular hole with an internal thread, an annular boss 25 is arranged in the detection port 15, the sealing ring 17 is arranged on the annular boss 25, the high-temperature and high-pressure light-transmitting plate 27 is pressed on the sealing ring 17, the annular pressing plate 26 with an external thread is matched with the internal thread of the detection port 15 to press and fix the high-temperature and high-pressure light-transmitting plate 27. In this embodiment, the annular pressing plate 26 with an external thread can be integrally formed with the probe shell 18.

[0046] In the online detection type supercritical carbon dioxide dyeing system, the cloth to be dyed is microcellular cloth implanted with electric charges treated by microcellular electric charge technology, and the micron-sized color master dye has electric charges attracting the electric charges on the cloth to be dyed. The cloth to be dyed is microcellular cloth implanted with electric charges treated by microcellular electric charge technology, and the micron-sized color master dye has electric charges attracting the electric charges on the cloth to be dyed. For example, the micron-sized color master dye has positive electric charges, and the cloth to be dyed has negative electric charges, and under the action of the positive electric charges and the negative electric charges, the micron-sized color master dye is adsorbed to the cloth to be dyed. The treatment method of the microcellular electric charge technology is as follows: after the cloth to be dyed (grey cloth) is subjected to dry cleaning, oil removal, dirt removal and pre-setting, the cloth is subjected to microcellular treatment on the cloth by a plasma device and is simultaneously implanted with negative electric charges, so that the cloth to be dyed forms microcellular cloth implanted with electric charges; the microcellular structure will shrink and restore as the negative electric charges weaken, so that after the cloth to be dyed is saturated with dye adsorption, the microcellular structure of the finished colored cloth disappears. Through years of work practice, it is known that the cloth that is not treated by the microcellular electric charge technology cannot be saturated with color master powder by using supercritical carbon dioxide boundary fluid dyeing; if traditional dyes are used, the dyes contain pure oil impurities as additives, and in addition to blocking and fouling, at most, the dyes can only be used to stain the color or cannot be used to dye at low fastness.

[0047] As shown in FIG. 3, the method for online detection by using the online detection type supercritical carbon dioxide dyeing system is as follows:

[0048] S1, obtaining the color parameters of the standard sample: the dyed cloth meeting the color requirements is taken as the standard sample and is placed into the dyeing kettle, and the color parameters of the standard sample are obtained by the spectrophotometer through the detection probe, and after the detection is completed, the standard sample is taken out from the dyeing kettle.

[0049] The spectrophotometer can use the L*a*b coordinate system to represent different colors, and in the color parameters of the L*a*b coordinate system:

[0050] L: is the lightness axis, indicating black and white, 0 is black, and 100 is white;

[0051] a: is the red-green axis, positive value is red, negative value is green, and 0 is neutral;

[0052] b: is the yellow-blue axis, positive value is yellow, negative value is blue, and 0 is neutral;

[0053] In this embodiment, the color parameters of the standard sample obtained by the spectrophotometer through the detection probe are as follows: L = 74.40, a = 1.67, and b = 23.80.

[0054] S2, dispensing the micron-sized color master dye: first, the pre-dyed fabric is placed in the dyeing kettle, then according to the color parameters of the standard sample detected outside the dyeing kettle, the red, yellow and blue three primary color dispensers are adjusted to dispense the micron-sized color master dye of the required color, and the micron-sized color master dye is sent into the dyeing kettle.

[0055] In this step, it should be noted that the color parameters of the standard sample used for dispensing the micron-sized color master dye are not the color parameters in step S1, because the color of the dyed fabric is evaluated in the environment outside the dyeing kettle, so the color parameters of the standard sample used for dispensing the micron-sized color master dye are obtained by detecting the standard sample outside the dyeing kettle with a traditional spectrophotometer.

[0056] S3, fabric into color: start the supercritical carbon dioxide dyeing system, and perform supercritical carbon dioxide dyeing on the pre-dyed fabric. During the dyeing process, the temperature in the dyeing kettle is 80-120℃, and the pressure is 27-31 MPa. After completing the color-into process, the dyeing kettle is depressurized, and the pre-dyed fabric is circulated and flushed with pure carbon dioxide subcritical fluid with a temperature of 20-40℃ and a pressure of 11-15 MPa to remove the residual floating color powder on the fabric surface. After flushing, the dyeing kettle is again depressurized to be in the state of external normal atmospheric pressure.

[0057] Dyeing process: supercritical carbon dioxide fluid dyeing is carried out at a corresponding high temperature of 80-120℃, so that the fabric fiber charge micro-honeycomb expands, and then the supercritical 27 to 31 MPa fluid repeatedly penetrates and fills the original color master powder, so that the negatively charged color master powder is easily absorbed by the polyamide synthetic fiber fabric to adsorb and implant color. When the filling polymeric density of the negatively charged original color master powder reaches the saturation state, it is reduced to normal temperature and depressurized, the weakly ionized micro-honeycomb and the fabric fiber tissue shrinkage correspondingly close to lock the color powder overflow, and then the normal temperature and high pressure carbon dioxide subcritical flow field is flushed to remove the residual color powder on the fabric surface, so that the color fastness of the fabric reaches 4 or more.

[0058] S4, obtaining the color parameters of the dyed fabric: starting the spectrophotometer, and the spectrophotometer obtains the color parameters of the dyed fabric in the dyeing kettle through the detection probe.

[0059] In this embodiment, the spectrophotometer obtains the color parameters of the standard sample through the detection probe as follows: L=74.88, a=1.33, b=23.70.

[0060] S5, judging whether the color of the dyed fabric is qualified or not: comparing the color parameter of the dyed fabric with the color parameter of the standard sample, if the difference between the two is within the predetermined range, the color of the dyed fabric is qualified, and the dyed fabric is taken out of the dyeing kettle; if the difference between the two exceeds the predetermined range, the color of the dyed fabric is unqualified, and the dyed fabric in the dyeing kettle is subjected to secondary correction and dyeing treatment.

[0061] For "the difference between the two is within the predetermined range", all colors can be perceived and measured by Lab color space, and these data can also be used to represent the color difference of the test sample, and are usually represented by △L, △a, △b, and the total color difference is represented by △Eab.

[0062] ΔL = L of the test sample - L of the standard sample (lightness / white and black difference);

[0063] Δa = a of the test sample - a of the standard sample (red / green difference);

[0064] Δb = b of the test sample - b of the standard sample (yellow / blue difference).

[0065] ΔEab (or ΔE) is the total color difference, and the larger the value is, the larger the color difference is.

[0066] The color difference formula of ΔEab: ΔEab = [(ΔL)2 + (Δa)2 + (Δb)2]1 / 2.

[0067] The predetermined range is: -2 ≤ ΔL ≥ 2; -1 ≤ Δa ≥ 1; -1 ≤ Δa ≥ 1; -2 ≤ ΔEab ≥ 2.

[0068] In this embodiment:

[0069] ΔL = L of the test sample - L of the standard sample = 74.88 - 74.40 = 0.48

[0070] Δa = a of the test sample - a of the standard sample = 1.33 - 1.67 = -0.34

[0071] Δb = b of the test sample - b of the standard sample = 23.70 - 23.80 = -0.10.

[0072] ΔEab = ΔL + Δa + Δb = 0.04.

[0073] From the above test results, it can be seen that ΔL is positive, indicating that the test sample is lighter (whiter) than the standard sample, the color difference is within the predetermined range; Δa is negative, indicating that the test sample is greener (greener) than the standard sample, which is within the predetermined range; Δb is negative, indicating that the test sample is bluer (bluer) than the standard sample, which is within the predetermined range; ΔEab is also within the predetermined range. It can be seen that the color of the dyed fabric is qualified, and the dyed fabric is taken out of the dyeing kettle.

[0074] In order to further control the quality of the dyed cloth, the dyed cloth after online detection is taken out from the dyeing kettle, and further off-kettle detection is carried out: through the cloth inspection machine, the standard small color sample is compared and the parameters are read to ensure that the color difference, color light, color saturation density of the cloth head and tail, cloth edge and middle, surface and inner layer are all above 95 points.

[0075] In the above online detection method, the standard sample is placed in the dyeing kettle for detection before dyeing, so that the detection environment of the color parameters of the standard sample is the same as that of the online detection, greatly improving the precision of the online detection.

[0076] In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An online detection supercritical carbon dioxide dyeing system, characterized by: The system comprises a dyeing kettle and a spectrophotometer, wherein the spectrophotometer comprises a detection probe, a data line and a spectrophotometer body. A detection port is opened on the wall of the dyeing kettle, and a detection probe is installed at the detection port. The detection probe transmits the color information of the dyed cloth in the dyeing kettle to the spectrophotometer body via the data line. The spectrophotometer body performs online detection of the color of the dyed cloth in the dyeing kettle.

2. The online detection supercritical carbon dioxide dyeing system according to claim 1, characterized in that: The detection probe includes a high-temperature and high-pressure resistant light-transmitting plate, a sealing ring, a probe housing, a light-collecting cover, a scattered light source and a light information sensor. The center of the light-collecting cover is provided with a reflected light passage hole, and the reflected light passage hole is provided with a light filtering device. The light-collecting cover is provided with a plurality of light source mounting holes along the periphery of the reflected light passage hole. The scattered light source is mounted at the light source mounting holes. The light-collecting cover is arranged in the probe housing, and the probe housing is fixed on the dyeing kettle. The light information sensor is arranged in the probe housing and above the light filtering device; the high-temperature and high-pressure resistant light-transmitting plate and the sealing ring are arranged in the detection port; the light emitted by the scattered light source is concentrated by the light-collecting cover through the high-temperature and high-pressure resistant light-transmitting plate and irradiated onto the dyed cloth in the dyeing kettle, and the reflected light of the dyed cloth is filtered by the light filtering device and irradiated onto the light information sensor, which is transmitted to the spectrophotometric colorimetry body through the data line.

3. The online detection supercritical carbon dioxide dyeing system according to claim 2, characterized in that: The detection port is a circular hole with an internal thread, and an annular boss is provided inside the detection port. The sealing ring is provided on the annular boss, and the high-temperature and high-pressure resistant light-transmitting plate is pressed on the sealing ring. The annular pressure plate with external threads is adapted to the internal thread of the detection port to press and fix the high-temperature and high-pressure resistant light-transmitting plate.

4. The online detection supercritical carbon dioxide dyeing system according to claim 3, characterized in that: The scattered light source is an LED lamp or a xenon lamp.

5. The online detection supercritical carbon dioxide dyeing system according to claim 4, characterized in that: The optical information sensor is an optical fiber probe, the data line is an optical fiber bundle, and the optical fiber probe transmits the reflected light received by the optical fiber bundle.

6. The online detection supercritical carbon dioxide dyeing system according to claim 5, characterized in that: It also includes a dye kettle, which is equipped with a red, yellow and blue primary color blender. The red, yellow and blue primary color blender is used to blend micron-level masterbatch dyes of different colors and feed the blended micron-level masterbatch dyes into the dye kettle. The dye kettle is connected to the dyeing kettle through a pipeline.

7. The online detection supercritical carbon dioxide dyeing system according to claim 6, characterized in that: The cloth to be dyed is a microcellular cloth implanted with electric charges after being processed by microcellular charging technology, and the micron-sized masterbatch dye carries electric charges that attract the electric charges on the cloth to be dyed.

8. The online detection supercritical carbon dioxide dyeing system according to claim 7, characterized in that: The dyeing process further comprises a circulating storage tank, a cooler, a high-pressure pump, a heater, an evaporator, a desorption kettle and a condenser. The circulating storage tank is used to store carbon dioxide gas. The carbon dioxide gas in the circulating storage tank passes through the cooler, the high-pressure pump and the heater in sequence to become a high-temperature supercritical fluid. The high-temperature supercritical fluid enters the dyeing kettle and passes through the cloth to be dyed. The high-temperature supercritical fluid flowing out of the dyeing kettle then passes through the evaporator and the desorption kettle in sequence. The separated micron-sized masterbatch dye is recovered for standby use. The separated carbon dioxide gas is sent to the circulating storage tank through the condenser.

9. A method for online detection using the online detection supercritical carbon dioxide dyeing system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Obtaining the color parameters of the standard sample: A dyed cloth that meets the color requirements is used as a standard sample and placed in a dyeing kettle. The spectrophotometer uses a detection probe to obtain the color parameters of the standard sample. After the detection is completed, the standard sample is removed from the dyeing kettle. S2. Mixing micron-sized masterbatch dyes: Pre-dyed fabric is placed in a dyeing kettle. Red, yellow, and blue primary color mixers are then adjusted based on the color parameters of standard samples tested outside the dyeing kettle to mix the micron-sized masterbatch dyes of the desired color. The prepared micron-sized masterbatch dyes are then mixed with supercritical carbon dioxide fluid and pumped back into the dyeing kettle via a circulating pump. S3. Fabric dyeing: The supercritical carbon dioxide dyeing system is started to dye the pre-dyed fabric with supercritical carbon dioxide. After the dyeing process is completed, the dyeing kettle is depressurized and the dyed fabric is circulated with high-pressure, room-temperature pure carbon dioxide subcritical fluid to flush the dyed fabric to remove the floating color powder remaining on the fabric surface. After the flushing is completed, the dyeing kettle is depressurized again to return the dyeing kettle to the normal atmospheric pressure. S4. Obtaining color parameters of the dyed cloth: Starting the spectrophotometer, which obtains the color parameters of the dyed cloth in the dyeing kettle through a detection probe; S5. Determine whether the color of the dyed cloth is qualified: compare the color parameters of the dyed cloth with the color parameters of the standard sample. If the difference between the two is within a predetermined range, the color of the dyed cloth is qualified and the dyed cloth is taken out of the dyeing kettle. If the difference between the two is outside the predetermined range, the color of the dyed cloth is determined to be unqualified and the dyed cloth in the dyeing kettle is subjected to a second dyeing process.

10. The online detection method according to claim 9, characterized in that: In step S1, the spectrophotometer uses the L*a*b coordinate system to represent different colors. In the color parameters of the L*a*b coordinate system, L is the brightness axis, representing black and white, 0 is black, and 100 is white; a: red-green axis, positive value is red, negative value is green, and 0 is neutral; b: yellow-blue axis, positive value is yellow, negative value is blue, and 0 is neutral; In step S5, the predetermined range is -2≤ΔL≥2; -1≤13437667084a≥1; -1≤Δa≥1; -2≤ΔEab≥2; wherein, ΔL=L inspected product-L standard sample; Δa=a inspected product-a standard sample; Δb=b inspected product-b standard sample; ΔEab=ΔL+Δa+Δb, where ΔEab is the total color difference.

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