Flame retardant protective clothing flame spread tester introduction

In the actual fire accident, the damage brought to people is far more than the damage caused by the open flame directly to the human body. Therefore, in the fire rescue, there is a fire-resistant service to protect the laborer Guan. Flame-retardant protective clothing is mainly used for the operators with open flames, sparks, molten metals and flammable, which prevent flames from being spread after encountering flames or hot objects. After leaving the source, they can immediately go out. The rapid carbonization of the flammable does not produce melting, dripping or wearing a hole, thereby plays an important protective effect on the operator from or reduces damage. Such protective clothing is widely used in the field of petrochemical, metallurgy, shipbuilding and fire protection.

According to the different flame retardant requirements of the use occasions, there are different performance index requirements. At present, the standards of domestic flame retardant protective clothing are mainly GB8965.1-2009 block. Burning clothing, GB8965.2-2009 welding service, GA10-2014 firefighters fire protection clothing, and LD58 forest fire clothes. In the above four product standards, the flame retardant performance test of the material is generally required in accordance with GB / T5455 (vertical method) test 1. The difference is that the flame retardant performance such as the flame retardation, the length, the length, melting, dripping, combustion characteristics, etc., or the oxygen index method (such as the LD58 standard) of the combustion performance test (such as the LD58 standard) . The flame retardancy test of the US flame retardant protective clothing fabric is basically used vertical method (ASTM D6413), while the EU flame retardant protective clothing standard like Eniso11611 welding and similar processes protective clothing, ENISO11612 high-temperature environment operator protective clothing, EN ISO ) This approach has a significant difference from China's vertical law, such as the size of the flame, the position of the combustion point and the sample, and the flame is applied to the duration of the sample.

With China's flame-retardant protective clothing and flame retardant fabrics to the export of European Union, the detection of flame retardant protective clothing in accordance with foreign standards is necessary. However, due to the unusual, imperfect, error, error of the error, the error, and the extent of the inspection time, fees, etc., to the foreign trade enterprise have no small obstruction. Since this opening, a thermal and flame protection based on ISO-15025 protective clothing, which defines a test method of the flame spread, is very urgent. To this end, by using electromechanical integration technology, the instrument is developed independently, and the error of manual determination of combustor flame is reduced, and the number of realizationThe word automatic test can not only provide effective means for the quality control of flame retardant protective clothing and fabric production enterprises, but also reduce the problem of testing after delivery; and can also speed up the pace of the international test technology standard. Improve China's flame-retardant protective clothing test technology level to meet international competition needs.

First, ISO-15025 Test Principle

limiting flame of a dedicated burner Apply information on the vertically placed fabric sample surface or bottom to the bottom of the flame spread, the flame of the sample, is flammable, drip fragment (extinguished or burning) and the hole and other information, and record spread (renewal) Time and fuel time. Second, the instrument requirement

According to the test principle, the instrument is able to perform a sample Two ways of surface combustion spread and two ways of combustion of the bottom edge. Instrument materials should be smoke and gas corrosion and thermal insulation, flame retardant, should ensure that the burner flame has sufficient oxygen content to stabilize the flame.

Third, technical indicators

Gas, priority, commercial grade propane; sample Holding the holder, see Figure 1; burner, see Figure 2; Flame Length, vertical direction (40 PLUSMN; 2) mm (for bottom edge combustion), horizontal direction (25 plusmn; 2) mm (for surface combustion); flame The position of the combustion point and the sample is shown in Figure 3; the timer accuracy lt; 0.2s.

Fourth, design

(1) The two combustion spreads of the surface and the edges are integrated together, and different tests are achieved by combustion position, angle, and flame length adjustment. (2) The fire source acts at the time of the sample, the spread of the sample after the sample is evacuated, and the fuel time is completed by the observation operation timer.

(3) The movement of the burner is automatically operated by the timer control the micro motor drive mechanism.

(4) For facilitating sample loading, the sample support device is a detachable suspension method.

5, the instrument composition

Instrument component includes a burner, burner regulation , Mobile institution, gas supplyAir system, sample support device, renewal, flammable timer device, control system, safety protection device and box structure, etc., see Figure 4.

1, the burner

According to the test principle and requirements, the instrument uses a combustion The instrument satisfies two different tests of surface combustion spread and the edge of the bottom edge combustion.

The burner is connected to the cross slider, can move up and down and horizontally; and can be performed horizontally and in the vertical direction 30 deg; two position adjustments. Its horizontal movement is driven by the micro motor, and the moving position is detected by the sensor and controlled by electrical control. The burner is united with electronic pulse discharge ignition, ignition and gas solenoid valve, if the gas valve is automatically closed, and the alarm prompt is alarmed. 2, a gas supply system

propane gas is connected to the instrument gas intake port via a gas pipe. The inner pipeline system is provided with a gas pressure gauge, a flow regulating valve and a gas solenoid valve.

3, the sample support device

160 mm Times; 200mm long frame structure of the thickness of 3 mm thick and a thickness of 10 mm; , Set the sample fixing needle and the limit column in its quad. The support device material uses high quality stainless steel to prevent rust. In order to facilitate flexible installation and unloading samples, the support device uses a suspension method. 4, Timer

Set three digital timing controllers for recording and control: burner flame action in the sample The time (10s); the burner flame is evacuated from the sample, the sample flame spread (renewed) time; the sample flameless (flammable) time. In accordance with selected tests (surface or edge spread) to ignite the burner, adjust the position of the flame length and the burner; start test, the combustor moves to the specified position of the distance sample under the micro motor drive (see Figure 3), so that the flame Active sample; at this time, the position sensor signal controls the flame action time timer timer, and the time controller controls the drive micro motor when the combustor leaves the sample back to the initial position while starting the seminometric time timing controller. After observing the renewal situation, the renewal once stopped immediately and immediately start timing until the furden is completely extinguished.

5, box structure

Based steel plate structure, wherein the burner, burner moving slider, drive mechanism is mounted , Sample support device and control. The box is provided with a fire-resistant plate with air flow hole to ensure sufficient air (oxygen content), so that combustion is stable. Top of the topThere is a disappear, which can quickly exclude the smoke produced by the sample; set a transparent door to facilitate loading and unloading the sample and observe the sample combustion state before the box.

6 Error. By the pulse ignition ignition, the gas regulating valve is adjusted to change the flame length of the burner. When the flame light passes through the light-shield hole, the photosensor signal behind the small hole drives the buzzer to emit sound, then the flame length Determined.

(1) Flame Level Level (for surface spreading test) The burner is adjusted to the horizontal position, and the small hole of the light shielding plate is located in the horizontal direction of the burner axis. 25 mm. The gas regulating valve determines the length of the flame level according to the above method.

(2) Flame Vertical Length (for edge spreading test) The burner is adjusted to the vertical position, and the small hole of the light shielding plate is disposed at the vertical direction of the burner axis 40 mm position; The gas conditioning valve determines the flame permeability according to the above method. After the flame length is determined, the burner is adjusted to 30 deg in the vertical direction according to the edge spread of Figure 3.

7, control principle and safety protection device control principle As shown in Figure 5, for security, the instrument is provided with a gas leak alarm and a gas source automatic cutting protection device.

6, test method

(1) Test The sample is prepared for 200mm Times; 160mm rectangular rigid specimen template (with the aperture of the four angles, the hole distance is consistent with the fixed needle pitch of the sample), 3 pieces of the weft samples; the surface of the fabric is obviously different When the material is surface spread, 6 pieces should be tested to the positive and negative surfaces.

(2) Sample wet is wet at a temperature (20 PLUSMN; 2) ° C, the sample is wetted at least 24 h in a relative humidity (65 PLUSMN; 5)%; the test should be trial Sample leaves the humidity environment for 2 min.

(3) Test ambient temperature 10 to 30 ° C, relative humidity of 15% to 80%, air flow rate lt; 0.2 m / s.

(4) The surface spread is installed according to Figure 1, igniting the burner and adjusts the flame length of 25 mm, the burner is adjusted at a horizontal position; start the test button to start testing, The flame acts on the sample surface fixed point 10S clock after the burner is automatically left. At this timeThe sample spread (renewal) time and the fuel time, and observed the generation of the upper pore hole of the recording sample, and the debris drops and the fragments ignited the filter paper below the sample support device.

(5) The bottom spread is installed in Figure 1, the burner is in a vertical position, igniting the burner and adjusts the flame length of 40 mm, and the adjustment burner is in the vertical direction. Cheng 30 Deg ;; Start the test button to start testing, the burner is automatically left after the flame acts on the bottom of the sample bottom fixed point 10S clock. At this time, the sample spread (renewed) time and the fuel time, and observed the generation of the upper pore hole of the recording sample, and the debris drip and the debris ignited the filter paper below the sample support device.

Repeat all sample tests and reports the test results in accordance with the provisions of ISO-15025. After the trial of China's foreign trade enterprise, the flame cloth (blending ratio A / C55 / 45) gray cloth was washed with the color fabric, and the results were tested in accordance with ISO15025, as shown in Table 1.

Table 1 results were consistent with the result of the delivery ITS test. This indicates that the instrument fully meets ISO-15025 standard flame retardant protective clothing flame spread, design meets standard requirements, and is reliable and easy to use.

Seven, conclusion

Flame retardant protective clothing flame spread tester And its test is fully compliant with the requirements of the ISO-15025 standard. The instrument is automatically controlled by the combustor flame length, and the integration and testing process of the two test methods of the sample surface spread and the edge spread of the specimen are realized. The instrument is convenient to use, and the performance is stable, and the design and production of export flame retardant protective clothing and its fabric provide effective and reliable testing means.