A method of textile colour fastness rating

Abstract

This invention discloses a method for rating the color fastness of textiles, comprising: after preliminary preparation of the textile to be tested, determining N types of yarn direction of the textile to be tested; cutting N textile samples according to the yarn direction; rubbing the textile samples of each direction with two standard friction cloths, one dry and one wet, with the friction head rubbing in the direction of the yarn; after completion, drying the wet standard friction cloth, taking pictures of the standard friction cloth, extracting rating features using image processing technology, and then rating the images after screening; textiles generally have relatively few dye particles between the woven yarns; rubbing back and forth in the direction of the yarn results in a large contact area with the yarn in the current weaving direction, allowing more dye particles to be dispersed on the standard friction cloth, thus solving the problem that the frictional resistance between the pile fabric and the friction head is greater during the test, leading to an increase in instantaneous pressure between the edge of the friction head and the pile fabric.

Description

Technical Field

[0001] This invention relates to the technical field of color fastness rating for textiles, and more particularly to a method for color fastness rating for textiles. Background Technology

[0002] The colorfastness rating method for textiles involves assessing their resistance to rubbing and their colorfastness level through a rubbing test. First, the test sample is fixed on a testing machine for rubbing, with the test time and number of rubbing cycles specified by the machine. Next, the test sample is rubbed against a standard cotton fabric, and the colorfastness level is assessed based on the degree of color change in both samples and the standard fabric after rubbing. Then, according to international standards or relevant industry standards, the test results are classified into five levels from 1 to 5, where level 1 represents the worst colorfastness and level 5 represents the best. Finally, based on the test results and requirements, the applicable scope and usage conditions of the textile are determined. It is important to note that different testing methods and standards may vary; therefore, the appropriate testing method and standard should be selected when rating the textile to ensure the accuracy and comparability of the results. Furthermore, factors such as the material, dyes, and processing techniques of the textile also affect its colorfastness; therefore, these factors should be comprehensively considered during the evaluation.

[0003] In existing technologies, during testing, the frictional resistance between the textile with pile and the friction head is greater, resulting in a significant increase in instantaneous pressure between the edge of the friction head and the pile textile. Simultaneously, the increased pressure causes more dye particles to adhere to the edge of the standard friction cloth, resulting in a halo on the standard friction cloth. Since the edge of the halo is heavily stained, it has a serious impact on the rating results. A halo refers to the phenomenon where one color penetrates, overlaps, or stains another color that usually constitutes the background, causing it to appear as a pattern or some other peculiar effect. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a method for rating the color fastness of textiles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a method for rating the color fastness of textiles, comprising the following steps:

[0006] S1. Sample preparation: Place the textile to be tested in a relaxed state in a constant temperature chamber for at least 24 hours; the temperature of the constant temperature chamber is 21±1℃ and the humidity of the constant temperature chamber is 65±2%RH.

[0007] S2. Sample collection: After the preparation stage is completed, take out the textile to be tested, determine the N direction types of the textile threads of the textile to be tested, and cut N textile samples according to the direction types.

[0008] S3. Preparation for friction: Fix the two standard friction cloths, one dry and one wet, onto the two friction heads respectively. Then, select different friction heads according to the N textile samples in different directions. Rub the textile samples in both dry and wet states in each direction, and make the friction heads rub along the direction of the textile threads. Adjust the height and angle of the friction heads before friction.

[0009] S4. Sample collection: After the friction is completed, remove the two standard friction cloths, one dry and one wet. After several wet standard friction cloths have dried, take pictures of the standard friction cloths and use image processing technology to extract rating features and filter the pictures.

[0010] S5. Rating: After taking and sampling the images and processing them, use the images as input to the system to obtain color information. Combined with subsequent neural networks, the system accurately extracts features and classifies the images to rate the color fastness of textiles.

[0011] In a preferred embodiment of the present invention, the textile to be tested is a long-pile pile textile, and the textile to be tested is combed before entering the S3 preparation friction stage.

[0012] In a preferred embodiment of the present invention, the textile sample cutting in step S2 is performed by cutting the sample along the direction of the textile thread of the textile to be tested.

[0013] In a preferred embodiment of the present invention, the combing process of the textile to be tested is as follows:

[0014] (1) The textile to be tested is placed under an electric field and the textile to be tested is attached and fixed on a zero electrode substrate, with a positive electrode plate disposed above the zero electrode substrate;

[0015] (2) After fixing, the zero electrode substrate is energized and the positive electrode plate is charged. Due to the attraction of the charge and the repulsion between the same charge on the textile to be tested, the fibers on the textile to be tested are combed towards the positive electrode plate.

[0016] In a preferred embodiment of the present invention, the friction head is selected as a square friction head.

[0017] In a preferred embodiment of the present invention, the standard friction cloth photographing process in step S4 involves photographing several whole pieces of standard friction cloth to ensure the integrity of the textile sample to be tested.

[0018] A textile color fastness testing device includes: a working platform, a friction component mounted on the working platform, and a sample holder mounted on the working platform.

[0019] The friction assembly includes: a plurality of transmission rods, a bracket mounted on the transmission rods, and a friction unit mounted on the bracket; the friction unit includes: a plurality of fixed rods, and a friction head mounted on each fixed rod; each transmission rod is provided with a protective shell, and each transmission rod is connected to a motor.

[0020] In a preferred embodiment of the present invention, the sample holder is fitted below a plurality of the friction heads, and a plurality of telescopic rods are mounted on the side of the sample holder near the working platform; a groove is formed at the position on the working platform where the sample holder is mounted; the sample holder and the telescopic rods are fitted into the groove.

[0021] In a preferred embodiment of the present invention, the sample holder is provided with a plurality of sample stages, and a plurality of conical fixing nails are installed on each of the sample stages; the position of each sample stage corresponds to the position of each friction head.

[0022] In a preferred embodiment of the present invention, a station slot is provided on the working platform, and a control switch is installed on the side of the working platform near the station slot.

[0023] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0024] (1) This invention determines the N directions of the textile threads of the textile to be tested after preliminary preparation, cuts N textile samples according to the direction type, and then rubs the textile samples of each direction with two standard friction cloths in dry and wet states, so that the friction head rubs along the direction of the textile thread. After the friction is completed, several wet standard friction cloths are dried, and the standard friction cloths are photographed. The rating features are extracted by image processing technology and the images are screened for final rating. Textiles are generally dyed before weaving. The dye particles are usually distributed in the direction of the textile thread. There are relatively few dye particles between the woven textile threads. The reciprocating friction along the direction of the textile thread results in a large contact area with the textile thread in the current weaving direction, so that more dye particles are dispersed on the standard friction cloth. This solves the problem that the friction resistance between the textile with pile and the friction head is greater during the test, which leads to the instantaneous pressure increase between the edge of the friction head and the pile textile. It also makes the color fastness rating more accurate.

[0025] (2) The present invention combs the textile before friction, places the textile to be tested under an electric field and fixes it to the zero electrode substrate, and sets a positive electrode plate above the zero electrode substrate. After fixing, the zero electrode substrate is energized and the positive electrode plate is charged. Due to the attraction of charges and the repulsion of charges between the fibers on the textile to be tested, the fibers on the textile to be tested are combed towards the positive electrode plate, thereby reducing the instantaneous pressure during friction. This prevents more dyeing particles from adhering to the edge of the standard friction cloth and creating a halo, and achieves uniform dispersion of dyeing particles on the surface of the standard friction cloth. This also makes the subsequent rating more accurate to a certain extent.

[0026] (3) The present invention fixes several textile samples to be tested on the sample stage, and adjusts the sample stage and the standard friction cloth to a suitable position by controlling the switch, and rubs them simultaneously with the dry and wet standard friction cloths, which improves the efficiency of friction testing; and sets a station slot on the working platform, which makes it convenient for staff to observe the friction process and to replace the standard friction cloth and clean the working platform. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a process flow diagram of a preferred embodiment of the present invention;

[0029] Figure 2 This is a perspective structural diagram of the testing device according to a preferred embodiment of the present invention;

[0030] Figure 3 This is a plan view of a textile combing process according to a preferred embodiment of the present invention;

[0031] In the diagram: S10, Prepare sample; S20, Take sample; S30, Prepare for friction; S40, Collect sample; S50, Rating; 1, Working platform; 2, Transmission rod; 3, Protective shell; 4, Control switch; 5, Station slot; 6, Motor; 7, Bracket; 8, Fixing rod; 9, Friction head; 10, Sample holder; 11, Sample stage; 12, Conical fixing nail. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example 1

[0037] like Figure 1 As shown, a method for rating the colorfastness of textiles includes the following steps:

[0038] S1. Sample preparation: Place the textile to be tested in a relaxed state in a constant temperature chamber for at least 24 hours; the temperature of the constant temperature chamber is 21±1℃ and the humidity of the constant temperature chamber is 65±2%RH.

[0039] S2. Sample collection: After the preparation stage is completed, take out the textile to be tested, determine the N direction types of the textile threads of the textile to be tested, and cut N textile samples according to the direction types.

[0040] S3. Preparation for friction: Fix the two standard friction cloths, one dry and one wet, onto the two friction heads respectively. Then, select different friction heads according to the N textile samples in different directions. Rub the textile samples in both dry and wet states in each direction, and make the friction heads rub along the direction of the textile threads. Adjust the height and angle of the friction heads before friction.

[0041] S4. Sample collection: After the friction is completed, remove the two standard friction cloths, one dry and one wet. After several wet standard friction cloths have dried, take pictures of the standard friction cloths and use image processing technology to extract rating features and filter the pictures.

[0042] S5. Rating: After taking and sampling the images and processing them, use the images as input to the system to obtain color information. Combined with subsequent neural networks, the system accurately extracts features and classifies the images to rate the color fastness of textiles.

[0043] The textile to be tested is a long-pile pile textile, and the textile to be tested is combed before entering the S3 preparation friction stage; in S2, the textile sample is cut along the direction of the textile thread of the textile to be tested, and a square friction head is selected; in S4, during the standard friction cloth photography and collection process, several whole pieces of standard friction cloth are photographed and collected to ensure the integrity of the textile sample to be tested.

[0044] Using the above steps to rate colorfastness, since textiles are generally dyed before weaving, the dye particles are usually distributed along the direction of the textile threads. There are relatively few dye particles between the woven textile threads. By rubbing back and forth along the direction of the textile threads, the contact area with the textile threads in the current weaving direction is large, which allows more dye particles to be dispersed on the standard rubbing cloth. This solves the problem that the frictional resistance between the rubbing head and the pile fabric is greater during the test, which leads to an increase in instantaneous pressure between the edge of the rubbing head and the pile fabric. It also makes the colorfastness rating more accurate.

[0045] like Figure 2 As shown, the combing process of the textile to be tested is as follows:

[0046] (1) The textile to be tested is placed under an electric field and the textile to be tested is attached and fixed on the zero electrode substrate, and a positive electrode plate is set above the zero electrode substrate.

[0047] (2) After the fixation is completed, the zero electrode substrate is energized and the positive electrode plate is charged. Due to the attraction of the charge and the repulsion between the same charge of each fiber on the textile to be tested, the fibers on the textile to be tested are combed towards the positive electrode plate.

[0048] The above process is used for combing, and the combing direction can be vertical, tilted to the left, or tilted to the right. However, the fibers on the textile are combed so that they do not cross each other. This ensures that the fibers on the textile being tested are combed towards the positive electrode plate, thereby reducing the instantaneous pressure during friction. This prevents more dye particles from adhering to the edge of the standard friction cloth and creating a halo effect. The dye particles are evenly dispersed on the surface of the standard friction cloth, which also makes the subsequent rating more accurate to a certain extent.

[0049] like Figure 3 As shown, a textile color fastness testing device includes: a working platform 1, a friction component installed on the working platform 1, and a sample holder 10 installed on the working platform 1; a station slot 5 is provided on the working platform 1, and a control switch 4 is installed on the side of the working platform 1 near the station slot 5.

[0050] The friction assembly includes: a plurality of transmission rods 2, a bracket 7 mounted on the transmission rods 2, and a friction unit mounted on the bracket 7; the friction unit includes: a plurality of fixed rods 8, and a friction head 9 mounted on each fixed rod 8; each transmission rod 2 is provided with a protective shell 3, and each transmission rod 2 is connected to a motor.

[0051] By fixing several textile samples to be tested on the sample stage 11, and adjusting the sample stage 11 and the standard friction cloth to a suitable position by controlling the switch 4, friction is carried out. The dry and wet standard friction cloths are rubbed simultaneously, which improves the efficiency of friction testing.

[0052] The sample holder 10 is installed below several friction heads 9, and several telescopic rods are installed on the side of the sample holder 10 near the working platform 1; a groove is opened at the position where the sample holder 10 is installed on the working platform 1; the sample holder 10 and the telescopic rods are installed in the groove.

[0053] The sample holder 10 is provided with several sample stages 11, and several conical fixing nails are installed on each sample stage 11; the position of each sample stage 11 corresponds to the position of each friction head 9; a station slot 5 is provided on the work platform 1, which facilitates the staff to observe the friction process and to replace the standard friction cloth and clean the work platform 1.

[0054] Example 2

[0055] The friction head 9 is rubbed along the direction of the textile thread. The direction of the textile thread is usually vertical, horizontal, or inclined at 45°, depending on the weaving method. Therefore, to facilitate the friction, the friction head 9, which is equipped with both dry and wet standard friction cloths, is not moved. Angle lines are set on the sample stage 11. The staff determines and fixes the direction of the textile samples cut from different directions by using the angle lines. The direction of the textile thread on the textile sample is aligned with the direction of friction of the friction head 9, and the sample is fixed on the sample stage 11 by conical fixing nails.

[0056] In the testing device, the parts at both ends of the bracket 7 that connect to the transmission rod 2 are equipped with a telescopic structure. This structure does not extend or retract during the friction test, but only when the standard friction cloth needs to be replaced after the friction is completed. By cooperating with the transmission rod 2, the friction head 9 is moved to the vicinity of the station slot 5, making it convenient for the staff to replace it. The telescopic rod is set below the sample seat 10 to correspond to the height of the friction head 9 and to make the subsequent rating more accurate.

[0057] In this invention, the textile to be tested in a relaxed state is placed in a constant temperature chamber for at least 24 hours. The temperature of the constant temperature chamber is 21±1℃, and the humidity is 65±2%RH. After the preparation stage, the textile to be tested is taken out, and the N directions of the textile threads are determined. N textile samples are cut according to the direction. Two standard friction cloths, one dry and one wet, are fixedly installed on two friction heads 9. Then, different friction heads 9 are selected according to the N textile samples with different directions. The textile samples with each direction are rubbed in both dry and wet states, and the friction heads 9 are rubbed in the direction of the textile threads. The height and angle of the friction heads 9 are adjusted before rubbing. The textile samples to be rubbed are adjusted by the angle markings on the sample stage 11, and the direction of the textile threads on the textile samples is aligned with the direction of the friction heads 9. The textile samples are fixed on the sample stage 11 by conical fixing nails, and then rubbing is performed in both dry and wet states.

[0058] After the friction is completed, two standard friction cloths, one dry and one wet, are removed. After several wet standard friction cloths are dried, photos of the standard friction cloths are taken. Image processing technology is used to extract rating features and filter the images. The images are then used as input to the system to obtain color information. Combined with subsequent neural networks, the images are accurately extracted and classified to rate the color fastness of the textiles.

[0059] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method of rating the color fastness of a textile, characterized in that, The method comprises the following steps: S1, sample preparation: place the textile to be tested in a relaxed state in a constant temperature room for at least 24 hours; the temperature of the constant temperature room is 21±1°C, and the humidity of the constant temperature room is 65±2%RH; S2, sample taking: after the preparation stage is completed, the textile to be tested is taken out, the N types of direction of the textile lines of the textile to be tested are determined, and N textile samples are cut according to the direction types; S3, friction preparation: two standard rubbers in dry and wet states are respectively fixed and installed on two friction heads, then different friction heads are selected according to the N textile samples in different directions, dry and wet state rubbings are performed on each type of textile sample, and the friction head rubs along the direction of the textile line, and the height and angle of the friction head are adjusted before rubbing; S4, sample collection: after rubbing is completed, the dry and wet state standard rubbers are taken off, and then the standard rubbers are dried, photographed and collected, rated features are extracted by using image processing technology, and the pictures are screened; S5, start rating: the pictures taken and image processed are used as system input, color information is obtained, accurate feature extraction and classification of the image are performed by using a subsequent neural network, and color fastness rating of the textile is performed; The textile to be tested is a long pile type pile textile, and the textile to be tested is combed before entering the S3 friction preparation stage; The combing process of the textile to be tested is as follows: (1) the textile to be tested is placed under an electric field, and the textile to be tested is fixed on a zero electrode substrate, and a positive plate is arranged above the zero electrode substrate; (2) after fixing, the zero electrode substrate is powered on, the positive plate has electric charge, due to the electric charge attraction and the repulsion between the electric charges on each pile on the textile to be tested, the piles on the textile to be tested are combed towards the direction of the positive plate.

2. A method of rating the color fastness of a textile according to claim 1, characterized in that: The textile sample cut in S2 is cut along the direction of the textile line of the textile to be tested.

3. A method of rating the color fastness of a textile according to claim 1, characterized in that: The friction head is a square friction head.

4. A method for rating the color fastness of a textile according to claim 1, characterized in that: In S4, the standard rubbers are photographed and collected in whole to ensure the integrity of the textile sample to be tested.

Images