WO2023159566A1

WO2023159566A1 - Method for marking hair on napped fabric

Info

Publication number: WO2023159566A1
Application number: PCT/CN2022/078289
Authority: WO
Inventors: 钱冲
Original assignee: 杭州电子科技大学技术转移有限公司
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2023-08-31

Abstract

The present invention relates to the field of using machine vision in fabric cleaning, in particular to a method for marking hair on a napped fabric. The method comprises the following steps: S1, pretreatment: soaking a fabric in a solution having a pH value of 10 or more for a certain period of time; and washing the fabric with clear water until the pH value is neutral; S2, dyeing: selecting a strong acid dye having a color obviously different from the color of the fabric, and carrying out dyeing treatment on the fabric by means of a selected strong acid dye dyeing process; and S3, post-treatment: carrying out water washing treatment on the fabric to complete marking. The present method can mark hair on the napped fabric in a manual or machine vision mode, and provides a basis for subsequent further cleaning.

Description

A method for marking hair on fleece fabric

technical field

The invention relates to the field of machine vision applied to fabric cleaning, in particular to a method for marking hair on fleece fabric.

Background technique

The flannelette of fleece fabric is generally made of polyester fiber, which is made by brushing and other processes, and the produced fabric is soft and skin-friendly. The fleece is soft, comfortable to wear, and has good warmth retention. It is suitable for winter underwear and pajamas. At present, there are a large amount of clothes worn next to the body, which adopt the material of adding cashmere as the inner directly contacting the skin.

Yet the clothes that adopt flannelette material to make, easily stick the hairs such as human hair, broken hair, pet hair on the cloth surface. Hair tends to get tangled with fleece material. It is difficult to completely remove the hair embedded in the fleece by normal machine washing or hand washing. When the hair embedded in the flannelette comes into contact with the skin, it will irritate the skin and cause itching, affecting the user experience. Especially for some relatively hard hair, such as broken hair left on clothing after a haircut, the length of such broken hair is generally within a few millimeters. After the broken hair and other hairs touch the flannel, it is easier to fix on the flannel through static electricity and physical friction than other fabrics because of the flannel surface structure, and it is relatively less easy to remove the hair by machine washing. Moreover, the color of some hairs is relatively dark, which is difficult to distinguish visually from many dark flannelette materials. It is not easy to remove hair by machine washing or hand washing, nor is it difficult to identify by manual or machine vision, which will affect subsequent removal by tweezers, glue and other tools or automatic equipment.

Once the fleece clothing is polluted by hair such as broken hair, its wearing comfort will be greatly reduced, especially for close-fitting fabrics, which will directly irritate the skin. If it cannot be identified in an effective way, it will be difficult to remove such broken hairs and other hairs, which can only force users to buy new clothes again, resulting in a waste of resources.

Contents of the invention

In order to solve the above problems, the present invention provides a method for marking hair on flannelette fabric, comprising the following steps:

S1 pre-processing:

Set labels at specified positions on the fabric and set standard hairs on the fabric;

Soak the fabric for a certain period of time in a solution with a pH value of 10 or above;

Wash the fabric with water until the pH value is neutral;

S2 dyed

Choose strong acid dyes that have a clear color difference from the fabric color;

Dye the fabric through the selected strong acid dyeing process;

S3 post-processing

Washing the fabric,

Check the dyed fabric, identify the standard breakage of the dyed fabric at the designated position in the pre-processing stage by manual or machine vision, whether it can be detected by manual or machine vision

If it can be detected, complete the marking;

If it cannot be detected, repeat steps S2 and S3.

The core principle of the present invention is that hair belongs to protein fiber, which can be dyed with acid dyes at low temperature, and the main body of fleece fabric is synthetic fiber such as polyester, which cannot be dyed conventionally at low temperature. In the post-washing process, the main body of the plush fabric will not be dyed, so that the hair color can be changed into a color that is obviously different from the fabric color, which is beneficial to the distinction through machine vision.

Beneficial effect: the preprocessing step in the S1 step includes the following steps: setting a label at a designated position and adding hairs of a standard length and other markers for detecting the dyeing effect.

The markers here are used to detect the degree of staining, thereby improving the time efficiency of the identification process. The principle is as follows:

The marker is used to identify the position of the standard hair to prevent it from being difficult to find and identify because the standard hair is too small.

In each dyeing process of step S2, the dyeing time refers to the selected strong acid dyeing process, and selects the minimum dyeing treatment time recommended by the dyeing process. After the minimum dyeing time treatment, if the dyeing effect of the standard hair reaches the level that can be distinguished by artificial or machine vision, the hair marking can be completed in the least time. In step S3, by detecting the dyeing condition of the standard hair, the dyeing effect of other hairs on the overall fabric is inferred. If the dyeing effect of the standard hair is not good, the hair is further dyed by repeated dyeing to increase the dyeing depth of the hair. , increase the color distinction between hair and fabric.

When machine vision deals with hair of different colors and shapes, more complex algorithms are needed. After turning the hair into a uniform color, machine vision can increase the weight of color difference when recognizing hair, and the algorithm used is simpler. The difficulty of algorithm and software development is reduced, and the recognition efficiency is improved.

The strength of hairs on the surface of fabrics treated with acid-base treatment and dyeing process will be reduced, further improving the ease of subsequent clean-up

Fabrics treated by acid-alkali treatment and dyeing process will also produce microstructure changes and micro-etches on the surface of synthetic fibers. Because they are all structural changes on the fiber surface, it can improve the strength of the fabric without significantly affecting the structural strength of the fabric. The fabric absorbs moisture for increased wearing comfort.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or prior art. Some specific embodiments of the invention are described in detail in a non-limiting manner.

FIG. 1 is a flow chart showing the labeling process.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

The fleece fabric made of polyester is selected, the fleece fabric is dark blue, and black hair is embedded in the fleece fabric.

S1 pre-processing:

Set the label at the designated position of the fabric and add the standard hair; the label is selected from a label that will not lose the position marking function of the standard hair in the process of processing. In this embodiment, a metal pin is selected, and the metal pin is fixed on the fabric, and the needle point of the pin points to Standard hair. The standard hair is black hair with a length of 1cm, which is embedded in the position of the pin head on the fabric. To improve representation, multiple labels can be set at different positions of the fabric, and multiple standard hairs can be set correspondingly.

The fabric is placed in a solution with a pH value of 10 or more and soaked for a certain period of time; in the present embodiment, a soda ash solution with a pH value of 11 is selected, and it can be processed at normal temperature to heating and boiling conditions. Heat treatment can improve time efficiency, and the processing time is 30 minutes, normal temperature processing, need to soak for a longer time. Treatment with alkaline solution, on the one hand, can remove the grease on the surface of the hair and other substances that hinder dyeing, on the other hand, it can cause fine etching on the surface of the synthetic fiber of the fabric, increase the hygroscopicity of the fabric, and then improve the wearing comfort.

Rinse the alkali-treated fabric with water until the pH value is neutral;

S2 dyed

Through the dyeing process of strong acid dyes (refer to the textbook "Dyeing and Finishing Process and Principles"), the overall fabric is dyed;

The dyeing process selected in this embodiment is:

Dye Variety: Acid Orange Two

Dye mass: 2% of fabric mass

Dye bath pH: 2

Dye bath quality: 20 times the fabric quality

Pingping plus O: 0.01% of fabric mass

The dyeing time is 30 minutes, and the dyeing temperature is 90 degrees Celsius.

After dyeing, wash with soap and water to remove floating color

For the selection of strong acid dyes, you only need to choose dyes that have obvious color differences from the color of the base color fabric. For example, for light-colored fabrics, choose darker and darker dyes; color dye.

The choice of dyeing process needs to refer to the selected dye, and choose the corresponding dyeing process recommended in the instruction manual of the selected dye for dyeing. In order to improve the time efficiency and energy efficiency of dyeing, the shortest dyeing time and the lowest dyeing temperature in the dyeing process are preferred.

S3 post-processing

Check the dyed fabric, and identify the standard hair at the label at the designated position of the dyed fabric by manual or machine vision, whether it can be detected by manual or machine vision. For detection by machine vision, it is judged whether it can be detected by machine vision by counting the detection rate of standard hairs detected by machines that have completed artificial intelligence training.

In this case, the camera is used to collect the image data of standard hairs on the fabric, and the scale is used to record the manual discrimination. Differentiate the difficulty level to define whether the hair on the fabric can be detected or not.

Calculate the difficulty of distinguishing standard hairs on the sample fabric, and divide the number of standard hairs evaluated as "easy to distinguish" by the total number of standard hairs on the sample fabric to obtain a percentage. When statistics show that the difficulty of distinguishing more than 90% of the standard hairs is "easy to distinguish", most of the other non-standard hairs representing the surface of the fleece fabric that need to be removed in the post-processing are also distinguishable, so it is considered to be "easy to distinguish". Can be detected by machine vision.

For samples that are considered to be detectable by machine vision, the image data of the standard hair on the fabric collected by the camera is marked as "easy", and then a training set is generated based on the marked images for algorithm training of machine vision. After the processing is over, the identification of the hair is completed.

If the degree of difficulty of distinguishing less than 90% of the standard hairs is "easy" according to the statistics, it is considered that it cannot be detected, and steps S2 and S3 are repeated.

The above are only some specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

A method for marking hair on fleece fabrics, comprising the following steps:

S1 pre-processing

Soak the fabric for a certain period of time in a solution with a pH value of 10 or above;

Wash the fabric with water until the pH value is neutral;

S2 dyed

Choose strong acid dyes that have a clear color difference from the fabric color;

Dye the fabric through the selected strong acid dyeing process;

S3 post-processing

The fabric is washed with water to complete the dyeing mark on the hair.
A kind of method for marking hair on plush fabric as claimed in claim 1, is characterized in that,

In the S1 pretreatment step, before the step of soaking the fabric in a solution with a pH value of 10 or above for a certain period of time, the following steps are also included: setting a label on a designated position of the fabric and setting standard hairs on the fabric.
A kind of method for marking hair on plush fabric as claimed in claim 2, is characterized in that,

In the step S3, after the fabric is washed with water, the following steps are also included:

Check the dyed fabric, identify the standard hairs at the designated position of the dyed fabric at the designated position in the pre-processing stage by manual or machine vision, and evaluate whether these standard hairs can be detected by manual or machine vision;

If it has reached the level that can be detected, the marking is completed;

If it cannot be detected, repeat steps S2 and S3.