The needle flame test machine uses a needle burner of specified size (Ф0.9mm) to pass a specific gas (butane) to burn the sample at a 45° angle in a regular and directional manner, and observes whether the sample is ignited and the burning time and length to evaluate the small flame ignition hazard caused by the equipment due to fault conditions.

Experimental operation:

I. Test preparation:

1. Place the test sample, white pine board and silk paper in an atmospheric environment with a temperature of 15℃-35℃ and a relative humidity of 45%~75% for 24 hours.

2. Check whether the equipment and instruments meet the test requirements of this project.

3. Before the test, prepare sample information (material composition, sample structure diagram, etc.), sample ignition hazard analysis and test records.

4. Fill in the prototype status, prototype identification content and relevant technical parameters in the test record.

II. Test steps:

1. Turn on the power switch of the combustion box and set the test time and observation time to 30s.

2. Open the combustion test door. Turn the gas switch back to the "OFF" position and confirm that the gas cylinder button is in the "off" position. Due to the special safety design, if the gas switch is not adjusted to the "OFF" position, the gas cylinder will not be able to be installed in the furnace body.

3. When placing the gas cylinder, the notch of the gas cylinder valve must be upward, and it must be noted that the notch of the gas cylinder valve is connected to the convex part of the joint of the pressure sensing safety device of the portable furnace.

4. Press the gas button to the "SET" position. If the gas cylinder is not installed correctly, it will cause butane gas to leak and emit a "hissing" sound. When installing the gas cylinder, it must be checked clearly that there is no sound.

5. Press the flame adjustment button on the control panel, the equipment will open the solenoid valve and automatically ignite. If the burner does not catch fire, click the stop button immediately. You can adjust the gas flow meter appropriately and press the flame adjustment button again. The accessories are equipped with a duckbill gauge, and other measuring tools (such as vernier calipers, etc.) can also be used. Adjust the gas flow meter again to stabilize the flame height at 12±1mm; the flame temperature rises from 100℃±5℃ to 700℃±3℃, the test time is 23.5±1.0s.8mm or the side distance is 5mm, turn the upward/downward self-reset switch left or right, and adjust the sample carrier with the sample clamped on the right to the standard position.

6. Press the debugging button, the burner trolley will run to the right limit and stop, adjust the burner to make it at a 45° angle to the horizontal plane, and adjust the burner and the fixture to keep the distance between the burner and the bottom surface of the sample.

7. Wrap a layer of silk paper tightly on a smooth white pine board with a thickness of about 10mm, and place it 200±5mm below the position of the test sample where the needle flame is applied.

8. After the flame temperature is reached, start the test switch, observe the test sample, the parts around the test sample and the bottom layer, and record the burning duration (t) from the moment the test flame is removed until the flame is extinguished, or until the test sample or its nearby parts or the test bottom layer no longer sees the burning phenomenon.

9. Press the reset button and the burner trolley will return to the initial position on the left.

III. Test results:

Evaluate according to the requirements of the product standard. If there is no requirement in the product standard, it is qualified if one of the following requirements is met:

1) The test sample does not produce flames and burning phenomena, the packaging silk paper does not burn or the white pine board does not carbonize.

2) After the needle flame is removed, the flame or burning duration of the test sample, the surrounding parts and the bottom layer is less than 30s, the parts around the test sample and the bottom layer no longer continue to burn, the packaging silk paper does not burn, and the white pine board does not carbonize.

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