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A method for evaluating the thermal protection level of protective fabrics and protective clothing

An evaluation method and thermal protection technology, applied in the direction of thermal development of materials, etc., can solve problems such as difficult to effectively distinguish the local thermal protection level of clothing, differences in test results, and difficult results

Inactive Publication Date: 2018-08-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are usually hundreds of sensors distributed on the body of the burning dummy, and it is difficult to effectively distinguish the local thermal protection level of clothing by only using discrete grade indicators such as no burn, first-degree burn, second-degree burn and third-degree burn
In addition, the burn evaluation methods used in the TPP test and the burning dummy test are different, which makes it difficult to compare the results between the two
The TPP test uses Stoll’s second-degree burn criteria to evaluate burns, while the burning dummy test system uses the Henriques skin burn scoring model. Two different burn evaluation methods may cause differences in test results
To sum up, the TPP test and the burning dummy test adopt different test processes, evaluation indicators and burn evaluation methods, so the test results at the fabric level usually cannot be directly compared with the test results at the clothing level

Method used

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  • A method for evaluating the thermal protection level of protective fabrics and protective clothing
  • A method for evaluating the thermal protection level of protective fabrics and protective clothing
  • A method for evaluating the thermal protection level of protective fabrics and protective clothing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The thermal protection levels of the fabrics shown in Table 1 were evaluated using the present invention. The heat exposure time of the fabric is set to 4s, and the data collection time of the cooling stage after the heat exposure is set to 60s. The thermal protection level test of the fabric adopts a general-purpose fabric thermal protection performance tester, which complies with ISO 17492, and uses a copper sheet heat flow meter to collect data on the temperature of the back of the fabric.

[0065] Table 1. Basic properties of tested fabrics

[0066]

[0067] CF is conductive fiber; PSA is polysulfonamide fiber; FR is flame retardant.

[0068] The evaluation method of the thermal protection level of the protective fabric is:

[0069] Step 1: Before the experiment starts, according to the test standard ISO 17492, place the thermal protection fabric on the fabric thermal protection performance tester. temperature;

[0070] Step 2: At the beginning of the experim...

Embodiment 2

[0093] Garments made from the fabrics in Table 1, all of the same style and size, were evaluated according to the invention for their level of thermal protection. The same as the test procedure at the fabric level, the heat exposure time of the garment is set to 4s, and the cooling time after the heat exposure is set to 60s. The overall test of the clothing adopts the burning dummy test system, which complies with ISO13506 and uses 118 sensors on the surface of the dummy (since the head, hands and feet of the dummy are not covered by the clothing, these parts need to be removed) to test the dummy. The heat flux density of the table is collected.

[0094] The evaluation method for the thermal protection level of protective clothing adopts a burning dummy test system for testing the overall thermal protection performance of clothing. The system complies with ISO 13506, and is characterized in that it includes:

[0095] Step 1: Before the experiment starts, according to the test...

Embodiment 3

[0123] From Example 1 and Example 2, it can be seen that the heat exposure time and cooling time of fabric and clothing are the same, and the evaluation index of fabric and clothing thermal protection level is also consistent, so the test results of fabric level and clothing level can be compared direct comparison, the comparison results are as follows image 3 shown. From image 3 It can be seen that the fabric value and clothing The correlation coefficient of the value is 0.85, which proves that there is a strong correlation between the two. Generally speaking, the better the thermal protection level of the fabric, the better the thermal protection level of the corresponding clothing.

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Abstract

The invention provides a method for evaluating the heat protection level of protective fabric and protective clothes. The method for evaluating the heat protection level of the protective fabric includes the steps that the protective fabric is placed on a fabric heat protection performance tester, the front face of the fabric faces a simulated heat source, and the back face of the fabric is provided with a copper sheet heat flow meter used for recording the temperature of the back face of the fabric; the copper sheet heat flow meter on the back face of the fabric collects data of a heat exposure period t10 and data of a cooling period t20 after heat exposure; heat absorbed by the copper sheet heat flow meter within the whole data collection period of time t10+t20 is calculated; heat needed by a second-degree skin burn is predicted according to the Stoll burn rule; the heat absorbed by the copper sheet heat flow meter is compared with the heat needed by the second-degree skin burn and predicted according to the Stoll burn rule, the maximum decay factor of the second-degree skin burn is calculated, and the average value of three times of testing is taken to judge the heat protection level of the protective fabric. Uniform indexes are adopted for evaluating the heat protection level of the fabric and the clothes.

Description

technical field [0001] The invention relates to a method for evaluating the thermal protection level of protective fabrics and protective clothing, belonging to the technical field of thermal protection safety. Background technique [0002] ISO 17492 specifies the test method for the thermal protection performance of thermal protection fabrics. This method measures the thermal protection performance of fabrics by using a heat flow meter under the fabric layer to simulate the time required for the skin to achieve second-degree burns. In addition to the small-scale fabric level evaluation method, ISO13506 specifies a burning dummy system test method for evaluating the overall thermal protection performance of protective clothing, which uses sensors under the clothing layer to simulate possible second-degree and third-degree burns on the skin site, and calculate the percent burn area. The evaluation method at the fabric level is simple to operate and low in cost; the test of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 何佳臻李俊
Owner DONGHUA UNIV
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