Brief introduction of the tester for anti-ignition characteristics of mattress and sofa

The mattress and sofa anti-ignition tester was developed based on BS 5852-2006 to test the combustion reaction of mattress and sofa material assemblies when they encounter ignition. It is widely used in the determination of flame retardancy of upholstered furniture in Europe and America

During the test, the test frame is covered with standard foam and the fabric to be tested, and the sample is ignited and the combustion process is detected with a standard ignition device consisting of a control box and a combustion tube.

Ii. Standards

The instrument is designed in accordance with BS 5852-2006, ISO 8191-1&2:1987, EN 1021-1&2, GB/T 17927.1&2:2011, BS EN 597-1&2, BS 7175, etc.

Test equipment

CSI103 mattress and sofa anti - ignition characteristic tester is composed of combustion test device and control box.

Test stand: place and fix test pieces.

Two kinds of stainless steel test stands with dimensions of (450×300×150)mm and (450×

450×300)mm, heat-resistant wire mesh structure, mesh size of cross diagonal 28mm×6mm.

Combustion tube: connect propane or butane gas as ignition source. Includes ignition tube and gas hose.

Stainless steel ignition tube: outer diameter (8±0.1)mm, inner diameter (6.5±0.1)mm, length (200±5)

Mm.

Gas hose: inner diameter (7±1)mm, length (2.5-3.0)m.

Power button: power control and display.

Timing button: when the sample starts to ignite, press the timing button to start the ignition timing. When the ignition is over,

Press the timer button again to turn off the timer.

Timer: set and display the ignition time and buzzer alarm time.

Buzzer: when the sample ignition ends, the buzzer sound and light alarm reminds to withdraw the ignition source, ending the experiment. Flow regulating valve: adjust the flow of gas to adjust the height of flame.

Gas flowmeter: shows gas flow. Pressure regulating valve: regulates gas pressure. Pressure gauge: shows gas pressure.

Gas switch: control gas pipeline on and off.

The inlet of the interface is connected to the gas pipe through the gas pipeline, and the outlet is connected to the gas inlet of the combustion box through the gas pipeline.

The power interface is connected to the external power through the power cord. The input power supply is 220V/50 ~ 60Hz. (note: power sockets must be grounded)

Sample preparation

1. The materials used as test pieces shall represent the fabrics, fillers and other components used in the final assembly.

(1) fabrics.

The size of fabric required for each test is (800±10)mm×(650±10)mm, and the cutting length side is parallel to the cloth side. Each side of the fabric is 335mm away from one of the ends, with a triangular incision at the position where all the fluffage on the fabric can go down along the backrest and through the hinge shaft to the front of the chair frame after the fabric is mounted on the test bench. The bottom of the triangular incision is about 50mm and the height is about 110mm. If interlining is used, it can be cut according to the same size and direction of the fabric, so that the interlining can cooperate with the sample rack under the fabric.

(2) packing.

Two pieces of decorative packing are required for each test. When using a small size test stand, two pieces of packing, one size and thickness is (450±5)mm×(300±5)mm×(75±2)mm, and the other is (450±5)mm×(150±5)mm×(75±2)mm. If the packing thickness is less than 75mm, a layer of underlining can be added to reach the required thickness.

When using the large-size test stand, the size and thickness of one piece of packing is (450±5)mm×(450±5)mm×(75±2)mm, and the other piece is (450±5)mm×(300±5)mm×(75±2)mm. If the packing thickness is less than 75mm, a layer of underlining can be added to reach the required thickness.

2. Open the sample rack so that the fabric passes through the hinged shaft. If there is a lining cloth, place it under the fabric; Place the packing under the fabric. If there is interfacing cloth, use it to fix the packing in the concave frame of the frame, and let about 20mm interfacing cloth roll into the inner side of the frame. Bolt the frame at right angles to ensure that the packing of each group does not shift. Fasten the fabric on the four edges of the frame with clamps to ensure that the fabric is firmly assembled and the tension is even.

Ii. Test operation

1. Cigarette test

1) generally, filter-free cigarettes are used, with a length of about 68mm, a diameter of about 8mm, a mass of about 1g, and a smoke combustion speed of about 12.0±3min/50mm. Mark the 5mm and 55mm self-ignmenting ends respectively. After lighting, insert the cigarette horizontally on the metal needle with a depth not exceeding 13mm at the ignition end. Note how long it took the cigarette to go from 5mm to 55mm in unventilated air.

2) press the power button on the control box panel to start the control box.

3) take the standard cigarette that meets the above requirements, smoke the air after lighting, so that the cigarette end burns vigorously without flame, but the consumed cigarette length is no more than 8mm.

4) place the smoking and burning cigarette at the intersection of the vertical and horizontal sides of the test article, so that the cigarette is at least 50mm away from the edge or the mark left by other previous tests. Click the timing button to start the timing, and the timing time is 1h.

5) observe the combustion progress and record the progressive smoke or flame combustion on the inner layer and/or fabric.

6) if fire or progressive smoke combustion is found in the furniture assembly within 1h after cigarette is placed, the sample will be extinguished and recorded as unqualified; If there is no fire or progressive smoke burning within 1h, or if the cigarette cannot be completely burned, then a new cigarette can be lit and placed at a new position more than 50mm away from the damaged part of the previous test, and the test can be redone. If the repeated test still does not cause ignition or progressive smoke combustion, or the cigarette does not burn out in full length, the cigarette can be recorded as qualified in the test, except for those samples that do not pass the final inspection; Otherwise, the sample can be extinguished and the result recorded as unqualified.

7) final inspection: if the test sample has been reported as no moving smoke combustion found outside, the component shall be disassembled immediately after the test procedure is completed to check whether there is moving smoke combustion inside. If there is, the test article shall be extinguished, and the test record shall be unqualified; For safety reasons, all smoke combustion must be extinguished before the sample holder is retired.

2. Butane flame test

1) connect gas pipeline and power supply according to equipment requirements. Open ball valve, adjust pressure and flow regulating valve, manual ignition. (before the experiment, adjust the pressure regulating valve and flow regulating valve to the minimum value.)

2) when the flame is lit, adjust the gas pressure to about 2.75kpa and the flame height to 35mm.

3) press the power button on the panel to start the control box.

4) move the combustion tube or the combustion tube bracket close to the sample, so that the combustion tube is placed on the boundary line between the chair surface and the backrest in an axial direction, so that the flame is at least 500mm away from the nearest edge or the mark left by other previous tests. Click the timing button to start the ignition, and the ignition time is 20±1s.

5) when the ignition time ends, the buzzer will sound an alarm. Meanwhile, carefully remove the combustion tube from the sample and turn off the timing button.

6) observe whether there is flame burning or progressive smoke burning on the inner core and/or fabric, but the flame, smouldering, smoking or smoke burning that goes out within 120s after removing the combustion tube is excluded; If flame or progressive smoke burning is observed on each decorative component, extinguish the test piece and record the test result as unqualified.

7) if found no flaming or travel sex burning smoke, is to do an experiment on new parts, such as the repeated test has not been found or travel with flame combustion smoke burning, is the result of the test record for qualified, except those who failed the final inspection sample, otherwise, the test piece to put out, and the test result is unqualified.

8) sequence of end of test

A) first close the pressure regulating valve of the butane tank.

B) ignite the torch flame according to the pre-ignition process. The aim is to burn out the butane gas from the butane tank to the torch line to prevent the remaining gas from flowing into the laboratory.

C) in the process of combustion tail gas, the flow regulating valve can be gradually adjusted to enlarge the flow, so as to make the gas in the pipeline burn out. After the flame automatically extinguishes, turn off the power and clean the combustion box.

Note: during each ignition, since air is stored in the line leading from the butane cylinder to the burner, and not the butane gas, the flame will not be immediately generated during the first ignition. More ignition is required (depending on the length of the tube) to introduce butane gas into the combustion tube.

Packing list

F103 packing list

Loading date

Serial number name quantity packing method

1 sample holder 1 with equipment

2 power cord 1 comes with the equipment

Product qualification certificate 1 with the equipment

Operation manual 1 with the equipment

Common problems

1. When lighting, there is no flame.

Solutions:

1) check whether all the pressure valves of the fuel tank are open.

2) during the first ignition, the ignition time is long to empty the air in the pipeline.