Method for testing continuous cool feeling of textile

Abstract

The invention discloses a method for testing continuous cool feeling of a textile. The method comprises the following steps: a, selecting raw materials; b, environment setting; c, body simulation; d, testing by a dry method; e, wet test; and f, performing data statistics. A comprehensive method is adopted to simulate the skin of a real person and settable external temperature and humidity environment, the problem that a traditional testing and evaluating method is not objective and not comprehensive is solved, the testing process can reflect the heat conduction performance of the fabric, the heat dissipation capacity of the fabric in the moisture absorption and quick drying process can be brought into cooling testing and evaluating, and from the comprehensive view, the testing and evaluating efficiency is greatly improved. At the present stage, the method can objectively characterize the continuous cool feeling performance of the fabric.

Description

Technical Field

[0001] The invention belongs to the field of textile testing, and in particular relates to a method for testing the continuous cool feeling of textiles. Background Art

[0002] In the hot summer, people are increasingly demanding cool clothing, but many consumers have discovered that many products labeled as cool only provide a short-term coolness, not a continuous coolness. This involves two professional terms: instant coolness upon contact and continuous coolness upon contact.

[0003] The instantaneous cool feeling on contact is explained in the national standard GB / T35263-2017 "Testing and Evaluation of the Instantaneous Cooling Performance of Textiles on Contact" as the moment when the skin comes into contact with fabric whose temperature is lower than its own, causing rapid loss of heat from the skin surface and an instant drop in temperature, which is then reflected to the brain through the temperature-sensitive nerve endings in the skin, forming a cool feeling. This means that the human body feels the cool feeling for a relatively short time, and when the fabric is close to the human body temperature, the cool feeling will disappear.

[0004] The group standard T / CNGA23-2021 "Testing and Evaluation of Continuous Cooling Performance of Clothing on Contact" explains that after the product absorbs moisture after coming into contact with the skin, the surface temperature of the product drops, making the human body feel continuously cool. This means that the human body will feel the coolness for a little longer.

[0005] There are two levels of evaluation for continuous cool contact performance, namely level 1 and level 2. In an environment of 35°C, the fabric is tested for one hour, and the average temperature is maintained below 27°C and the maximum temperature does not exceed 30°C. At this time, the fabric can be said to have a continuous cool performance of level 1; when the average temperature is maintained below 30°C and the maximum temperature does not exceed 30°C, the fabric can be said to have a continuous cool performance of level 2.

[0006] However, when wearing clothes in daily life, it is too late to have a cooling effect until the body sweats out of heat. The body has already felt uncomfortable, and the continuous loss of heat after sweating may cause the body to catch a cold, which may lead to illness.

[0007] In summer, the human body feels hot, but most of the time it does not sweat. Sometimes only a part of the body is very hot. These real-life scenarios require an objective test and evaluation method for the continuous cool feeling of fabrics to judge the continuous cool feeling of contact. Summary of the invention

[0008] The main technical problem solved by the present invention is to provide a method for testing the continuous cooling sensation of textiles. A comprehensive method is adopted to simulate real human skin and an adjustable external temperature and humidity environment, thereby overcoming the problem that traditional testing and evaluation methods are not objective and comprehensive. The testing process can not only reflect the thermal conductivity of the fabric itself, but also incorporate the heat dissipation capacity of the fabric during the moisture absorption and quick-drying process into the cooling test and evaluation. On the whole, this method can objectively characterize the continuous cooling sensation performance of the fabric at this stage.

[0009] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a method for testing the continuous cool feeling of textiles, comprising the following steps: a. Raw material selection: Take 5 parallel samples of appropriate sizes as the test fabrics and test them in sequence; b. Environmental setting: Use two closed chambers connected in the middle to simulate the environment inside and outside the test fabric, separated by a diaphragm in the middle, set the temperature and humidity values ​​of the two closed chambers respectively, and set an infrared thermal imager on one side of the test surface; c. Body simulation: Use a number of copper sheets of a certain thickness and width, and arrange them at equal intervals. There are electric heating and temperature measuring and controlling devices at both ends of the copper sheets. The temperature measuring component is placed in the middle of the copper sheets to maintain a specific temperature value between 30-38°C. The part that contacts the test fabric is wrapped with cowhide, and finally a simulated human body is obtained; d. Dry test: Open the two sealed chambers, take out the diaphragm, place the test fabric between the two sealed chambers and buckle them together. After buckling, the test fabric partially covers the surface of the simulated human body, and start the test. The infrared thermal imager measures the temperature of one side of the test surface of the test fabric, and records the temperature value at equal intervals within the total test time; e. Wet test: Open the two closed chambers, take out the diaphragm, spray water evenly on the test fabric with a water spray device, place the test fabric between the two closed chambers and buckle them together. After buckling, the test fabric partially covers the surface of the simulated human body, start the test, and use an infrared thermal imager to measure the temperature of one side of the test surface of the test fabric. Record the temperature value once at equal intervals within the total test time; f. Data statistics: record the temperature data of the infrared thermal imager test. For each test fabric, the average temperature of the six temperature values ​​recorded in the last 1 minute of the test process is recorded as the average cooling value x, and the average value of the five parallel sample results is recorded as the average cooling value X. Compare the average cooling value X of the test fabric with the grade to know the continuous cool feeling of the test fabric.

[0010] In a preferred embodiment of the present invention, in step b, the temperature on one side of the test surface is 35°C and the humidity is 65%, and the temperature on the other side is 30°C and the humidity is 50%.

[0011] In a preferred embodiment of the present invention, in step c, the distance between adjacent copper sheets is 50 mm, and the temperature is 35° C., that is, the simulated human body temperature is 35° C.

[0012] In a preferred embodiment of the present invention, in step d or step e, the total test duration is 6 minutes and the equal interval duration is 10 seconds.

[0013] In a preferred embodiment of the present invention, in step e, the water spraying device sprays water 5 times, the water temperature is 35±1°C, and corresponds to the top, bottom, left, right and middle of the test fabric respectively.

[0014] In a preferred embodiment of the present invention, in step f, the test temperature point is 35° C. and the level is level 5.

[0015] The beneficial effects of the present invention are as follows: a method for testing the continuous cooling sensation of textiles pointed out by the present invention adopts a comprehensive method to simulate real human skin and an adjustable external temperature and humidity environment, overcoming the problem that traditional testing and evaluation methods are not objective and comprehensive. The testing process can not only reflect the thermal conductivity of the fabric itself, but also incorporate the heat dissipation capacity of the fabric during the moisture absorption and quick-drying process into the cooling test and evaluation. On the whole, this method can objectively characterize the continuous cooling sensation performance of the fabric at this stage. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The embodiments of the present invention include: A method for testing the continuous cool feeling of textiles comprises the following steps: Take 5 parallel samples of appropriate size as the test fabrics and test them in sequence; Two closed chambers connected in the middle are used to simulate the environment inside and outside the test fabric, separated by a diaphragm in the middle. The temperature on one side of the test surface is 35°C and the humidity is 65%, and the temperature on the other side is 30°C and the humidity is 50%. An infrared thermal imager is set on one side of the test surface; A number of copper sheets of certain thickness and width are used, and the copper sheets are arranged at equal intervals, with the interval between adjacent copper sheets being 50 mm. Electric heating and temperature measuring and controlling devices are provided at both ends of the copper sheets, and the temperature measuring component is placed in the middle of the copper sheets to maintain a specific temperature value between 30-38°C. The part of the copper sheet that contacts the test fabric is wrapped with cowhide, and the actual temperature is 35°C, that is, the simulated human body temperature is 35°C, and finally a simulated human body is obtained; During the dry test, open the two sealed chambers, take out the diaphragm, place the test fabric between the two sealed chambers and buckle them together. After buckling, the test fabric partially covers the surface of the simulated human body, and the test begins. The infrared thermal imager measures the temperature of one side of the test surface of the test fabric. The test lasts for 6 minutes, and the temperature value is recorded every 10 seconds. During the wet test, open the two closed chambers, take out the diaphragm, and use a water sprayer to spray water evenly on the test fabric. The water sprayer sprays water 5 times at a water temperature of 35±1℃, and the water temperature corresponds to the top, bottom, left, right and middle of the test fabric respectively. The test fabric is placed between the two closed chambers and then buckled. After buckling, the test fabric is partially covered on the simulated human body surface. The test starts, and the infrared thermal imager measures the temperature of one side of the test surface of the test fabric. The test time is 6 minutes, and the temperature value is recorded once at an interval of 10 seconds. The temperature value data of the infrared thermal imager test was recorded. The average temperature of each test fabric according to the 6 temperature values ​​recorded in the last 1 minute of the test process was recorded as the average cooling value x, and the average value of the 5 parallel sample results was recorded as the average cooling value X. In this application, the test temperature point was 35°C, which was divided into 5 levels. The average cooling value X of the test fabric was compared with the level to obtain the continuous cooling feeling of the test fabric. Example

[0018] Select fabric A with an instantaneous coolness value of 0.26, cotton-polyester fabric B, and nylon-viscose fabric C as the samples to be tested, take 5 parallel samples of appropriate size as test fabrics for testing in sequence, set the temperature of one side of the test surface of the closed chamber to 35°C and the humidity to 65%, and the temperature of the other side to 30°C and the humidity to 50%, and set an infrared thermal imager on one side of the test surface for temperature acquisition, open the two closed chambers, take out the diaphragm, and use a water spray device to spray water evenly on the test fabric. The water spray device sprays water 5 times, and the water temperature is 35±1°C, corresponding to the top, bottom, left, right and middle of the test fabric respectively. Place the test fabric between the two closed chambers and buckle them together. After buckling, test the fabric part Cover the simulated human body surface at 35℃ and start the test. The infrared thermal imager measures the temperature of one side of the test surface of the test fabric. The test lasts for 6 minutes, and the temperature value is recorded every 10 seconds. The average temperature of the 6 temperature values ​​recorded in the last 1 minute of the test process is recorded as the average cooling value x, and the average value of the 5 parallel sample results is recorded as the average cooling value X. The average cooling of the fabric with an instantaneous coolness value of 0.26 is 7.2℃, the average cooling of the cotton-polyester fabric is 5.5℃, and the average cooling of the nylon-viscose fabric is 8.6℃. According to the degree of reduction of the lowest average temperature collected during the test relative to 35℃, it is divided into the following 5 levels:

[0019] According to the comparison in the above table, the continuous coolness level of fabrics with an instantaneous coolness value of 0.26 is at Level III, and the relative sensory evaluation is generally cool. The continuous coolness level of cotton and polyester fabrics is at Level IV, and the relative sensory evaluation is slightly cool. The continuous coolness level of brocade and viscose fabrics is at Level II, and the relative sensory evaluation is cool.

[0020] In summary, the present invention provides a method for testing the continuous cooling sensation of textiles, which adopts a comprehensive method to simulate real human skin and an adjustable external temperature and humidity environment, overcoming the problem of traditional testing and evaluation methods being subjective and incomplete. The testing process can not only reflect the thermal conductivity of the fabric itself, but also incorporate the heat dissipation capacity of the fabric during the moisture absorption and quick-drying process into the cooling test and evaluation. On the whole, this method can objectively characterize the continuous cooling performance of the fabric at this stage.

[0021] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for testing the continuous cool feeling of textiles, characterized in that: The steps include: a. Raw material selection: Take 5 parallel samples of appropriate sizes as the test fabrics and test them in sequence; b. Environmental setting: Use two closed chambers connected in the middle to simulate the environment inside and outside the test fabric, separated by a diaphragm in the middle, set the temperature and humidity values ​​of the two closed chambers respectively, and set an infrared thermal imager on one side of the test surface; c. Body simulation: Use a number of copper sheets of a certain thickness and width, and arrange them at equal intervals. There are electric heating and temperature measuring and controlling devices at both ends of the copper sheets. The temperature measuring component is placed in the middle of the copper sheets to maintain a specific temperature value between 30-38°C. The part that contacts the test fabric is wrapped with cowhide, and finally a simulated human body is obtained; d. Dry test: Open the two sealed chambers, take out the diaphragm, place the test fabric between the two sealed chambers and buckle them together. After buckling, the test fabric partially covers the surface of the simulated human body, and start the test. The infrared thermal imager measures the temperature of one side of the test surface of the test fabric, and records the temperature value at equal intervals within the total test time; e. Wet test: Open the two closed chambers, take out the diaphragm, spray water evenly on the test fabric with a water spray device, place the test fabric between the two closed chambers and buckle them together. After buckling, the test fabric partially covers the surface of the simulated human body, start the test, and use an infrared thermal imager to measure the temperature of one side of the test surface of the test fabric. Record the temperature value once at equal intervals within the total test time; f. Data statistics: record the temperature data of the infrared thermal imager test. For each test fabric, the average temperature of the six temperature values ​​recorded in the last 1 minute of the test process is recorded as the average cooling value x, and the average value of the five parallel sample results is recorded as the average cooling value X. Compare the average cooling value X of the test fabric with the grade to know the continuous cool feeling of the test fabric.

2. The method for testing the continuous cool feeling of textiles according to claim 1, characterized in that: In step b, the temperature on one side of the test surface is 35°C and the humidity is 65%, and the temperature on the other side is 30°C and the humidity is 50%.

3. The method for testing the continuous cool feeling of textiles according to claim 1, characterized in that: In step c, the distance between adjacent copper sheets is 50 mm and the temperature is 35° C., that is, the simulated human body temperature is 35° C.

4. The method for testing the continuous cool feeling of textiles according to claim 1, characterized in that: In step d or step e, the total test duration is 6 minutes, and the equal interval duration is 10 seconds.

5. The method for testing the continuous cool feeling of textiles according to claim 1, characterized in that: In step e, the water spraying device sprays water 5 times, the water temperature is 35±1°C, and corresponds to the top, bottom, left, right and middle of the test fabric respectively.

6. The method for testing the continuous cool feeling of textiles according to claim 1, characterized in that: In step f, the test temperature point is 35°C and the level is level 5.

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