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Combustion test principle of 45 degree flammability tester

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Combustion test principle of 45 degree flammability tester

Author: Date :2021-09-26 Views: order
45 degree flammability tester is used for the determination of the flammability of textiles for clothing, measuring the intensity and speed of combustion once ignited when wearing flammable textiles, can also test the damage area and damage length of textile fabrics in the 45 ° state and the number of contact flame when heated and melted to a specified length.
 

Conform to the standard:

 
ASTM D 1230 FTMS 191-5908 CFR 16 Part 1610, CALIF TB 117 NFPA 702 GB/T 14644
 

45 degree flammability tester test principle:

 
1. Burning intensity and speed test
 
Under the specified conditions, the specimen will be placed at an angle of 45 °, the specimen ignition 1 s, the specimen will be flamed upward for a certain distance of the time required to assess the textile burning intensity of the measure. With the surface pile of the fabric, the bottom cloth ignition or melting as an additional indicator of the intensity of combustion.
 
2. Damage area and damage length test
 
In the prescribed test conditions, the 45 ° direction of the textile specimen ignition, measurement of fabric combustion after the renewal and negative combustion time, damage area and damage length.
 
3. Contact flame number test
 
Under the specified test conditions, the 45 ° direction of the textile specimen ignition, measurement of fabric burning from the lower end of the specimen 90mm need to contact the flame times.
 
45 degree flammability tester

45 degree flammability tester component parts:

 
A. Combustibility tester
 
1. Flammability tester for an airflow-proof ventilation chamber, the interior is equipped with a standard ignition tool, a specimen holder and an automatic timing device.
 
This airflow-proof metal test chamber prevents the circulation of air around the specimen holder and flame, but allows natural ventilation for rapid oxidation. The chamber is 368mm (141/2") wide x 216mm (81/2") deep x 356mm (14") high, with twelve 12.7mm (1/2") holes equally spaced along the back of the upper closure, and a ventilation strip at the bottom of the sliding glass door at the front of the chamber.
 
3. The specimen is mounted in the frame and placed on the specimen holder with an inclination of 45°. The specimen holder should be mounted in such a way that the thickness between the specimen and the front of the flame can be adjusted. There is a pointer, when the specimen frame is correctly adjusted, it touches the front of the specimen.
 
4. Specimen clamp by two pieces of 1.6mm (1/16 inch) thick matching metal plate, along the two sides of the clamping device is composed of. The specimen is fixed between the two clamping devices, the plate is loosely slotted and pinned for alignment. In addition to the full length of the specimen on the 38 mm (11/2 inches) width, the two plates of the specimen holder all cover. The specimen holder is supported at a 45° angle on a shelf in the windproof test chamber, and five specimen holders are to be prepared.
 
5. The design must enable the specimen to be adjusted from the outside of the combustion chamber.
 
6. The ignition tool is driven by the bullet building mechanism, set on a spaced subcutaneous injection needle gas nozzle composition, gas nozzle with a copper cover protection.
 
7. Stop line from the side of the barrel pulled tightly through the appropriate installation in the specimen frame and small chamber wall conductor, allowing the line contains the appropriate location, exactly 127mm (5 inches) from the center of the ignition combustion collision on the specimen, stop line with 50 gauge mercerized sewing thread.
 
8. A heavy hammer with a clip knot on the stop line, when it falls, stop the timer.
 
9. The glass door slides in a slot on the front of the small chamber. It should be designed so that the sliding door is fixed in the open position for inserting specimen clips.
 
10. A sensitive fuel control valve regulates the amount of fuel supplied in the fuel tank. One end of the control valve is a 12.7mm (half-inch) male connector connected to a 0.9kg (2lb) capacity No. 4 standard butane gas cylinder.
 
11. The pressure gauge is a U-shaped glass tube with an engraved gas marker to record the gas pressure delivered to the micro-burner.
 
12. The design should facilitate the control of the test, such as energy control and start-up test control. The actuator moves the micro-burner to the most forward position and automatically starts the timer when the flame strikes the specimen. When the line is burned off and the heavy hammer falls, the timer is stopped.
 

Second, bristle device:

 
1. Brush device for a set of base plate, dragging a trolley on it, the trolley runs on the track parallel to the lower surface of the base plate on two sides. Brushes with hinges mounted on the back of the base plate, vertically with 150g (0.33 pounds) of pressure on the car.
 
2. The brush consists of two rows of hard nylon bristle clusters staggered left and right, the diameter of nylon bristles is 0.41mm (0.016 inch), 19mm (3/4 inch) long, each cluster of bristles has 20 nylon bristles, 4 clusters per inch. In the front of the cart there is a clamp, brush hair operation, it can be used to clamp the specimen on the cart.
 
3. Put the specimen on the cart with the clamp to hold it, lift the brush, push the cart to the back so that the brush is placed on the specimen surface, and then pull the cart forward by hand at an even speed.
 

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