Evaluation method for thermal protection level of protective clothing

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

Inactive Publication Date: 2018-03-02
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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  • Evaluation method for thermal protection level of protective clothing
  • Evaluation method for thermal protection level of protective clothing
  • Evaluation method for thermal protection level of protective clothing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 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.

[0066] Table 1. Basic properties of tested fabrics

[0067]

[0068] CF is conductive fiber; PSA is polysulfonamide fiber; FR is flame retardant.

[0069] The evaluation method of the thermal protection level of the protective fabric is:

[0070] 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;

[0071] Step 2: At the beginning of the experim...

Embodiment 2

[0094] 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.

[0095] 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:

[0096] Step 1: Before the experiment starts, according to the test...

Embodiment 3

[0124] 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 an evaluation method for thermal protection level of protective clothing. The method includes the steps of: a) exposing the thermal protective clothing to a simulative heat source, setting thermal exposure time as t1 (s), and collecting data in the thermal exposure step by means of a heat-flow meter on the surface of a dummy; b) in a cooling step after the thermal exposure of the clothing is finished, keeping the data to be collected by the heat-flow meter on the surface of the dummy; c) calculating the heat being absorbed by every sensor on the surface of the dummy in the whole data collection time t1+t2; d) according to Stoll burning principle, predicting the required heat that skin reaches second-degree burn; e) calculating maximum attenuation factor (OMAF) of second-degree burn injury of the clothing; f) according to the steps hereinabove, repeatedly measuring the OMAF value of the clothing for two times, and determining the local thermal protection level ofa part, corresponding to the sensors, of the protective clothing by means of the average value of the three OMAV values. The method employs a uniform index for evaluating the thermal protection levelof fabrics and clothing.

Description

[0001] This application is a divisional application with an application date of September 16, 2015, an application number of 201510589602.X, and a divisional application titled "A Method for Evaluation of Thermal Protection Level of Protective Fabrics and Protective Clothing" technical field [0002] The invention relates to a method for evaluating the thermal protection level of protective clothing, which belongs to the technical field of thermal protection safety. Background technique [0003] 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 cl...

Claims

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Application Information

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