Inclined Plane Flammability Tester,Inclined Plane Flammability Tester Manufacturer,Inclined Plane Flammability Tester Suppliers India
Search:
Inclined Plane Flammability Tester,Inclined Plane Flammability Tester Manufacturer,Inclined Plane Flammability Tester Suppliers India,Textile Testing Equipment

Textile Testing Equipments » Physical Testing Instruments » Inclined Plane Flammability Tester

Inclined Plane Flammability Tester

The specimen rack provides support for the holders in which the specimens are mounted.  Its angle of inclination is 450.  The rack can be moved sideways to enable fabrics of different thickness to be set at the specified distance from the tip of the jet with the help of an adjusting screw.  A built-in finger is provided to gauge this distance for setting it to the desired value. 

The Specimen holder consists of two matched stainless steel U shaped plates between which the test specimen can be held.  The specimen holder sits over the specimen rack in a precisely determined position 450 inclination and is so positioned that the igniting flame strikes the specimen centrally and 6 mm above the bottom edge perpendicular to the face of the test specimen.  Five such specimens holders are provided with the equipment. 

The ignition arrangement comprises of a jet mounted on a extension of the shaft of a syncroset motor such that it can be rotated into a position perpendicular to the surface of the fabric.  The distance between the tip of the jet and the surface of the burner can be adjusted to 8 mm.  When the tip of the jet is moved away from the specimen, the jet becomes vertical.  The flame is produced at the tip of the jet by LPG Gas.  The length of the flame is set to 16 mm when the jet is vertical with the help of a control valve and is measured with the help of built in gauge rod. 

The motion to the burner tip is given with the help of the syncroset motor.  The movement of the jet for starting ignition is given with the help of a push button.  The ignition time can be set from 1 to 99 seconds with the help of a preset timer.  The jet is automatically brought back to its initial position at the end of a pre-settable time interval. 

The ignition time is automatically recorded on an electronic digital time interval meter which starts as soon as the flame impinges on the test specimen and stops when a thread placed above the test specimen is burnt.  Five threads with two hooks each and one weight to hold the thread in position is provided with the equipment. 

The draught-proof enclosure is made from stainless steel sheet and houses the various components of the tester.  It is provided with 12 holts, each 13 mm in diameter, near the top of its rear wall.  A clear acrylic door is provided in the front which can be opened to enable the test specimen holder to be placed on the rack. 

The equipment is finished in bright chrome to give it a corrosion resistant finish. 

A bursting device for preparing test specimens from raised fabric samples is available as an optional accessory.  The brushing device consists of a carriage on which the specimen with specimen holder can be mounted.  The carriages can be moved manually on tracks made on the base plate of the device slowly, such that a brush mounted in brush holder which in turn is hinged on a bracket fitted on the base plate, brushes the sample under a pressure of 150 g.  The brush is 40 mm long comprising of two rows of stiff nylon bristles. 

The LPG Gas Cylinder needed for conducting the test is to be provided by the purchaser.


TECHNICAL DATA :
Size of Test Specimen holder 70 x 170 mm.
Size of opening of specimen holder 40 x 150 mm.
Size of Test Specimen 50 x 150 mm
Angle of inclination of the specimen 45o.
Size of draught proof enclosure    370 x 200 x 360 mm.
   
   

RELATED STADARDS :

          ASTM D 1230 - 1985        : Standard Test Method for Flammability of Apparel Textiles.

BS 2963 - 1958  : Tests for the Flammability of Fabrics Method -B- and the 45o Flame Test.

IS 11871 - 1986  : Methods for Determination of Flammability and Flame resistance of Textile Fabrics Method –

              B- the 45 o Flame Test.

PREPARATION OF TEST SPECIMENS

  1. Performs tests on the fabrics as it will reach the consumer.  Process any partially finished fabrics first in accordance with manufacturer’s instructions.
  2. First test specimens each measuring 150 x 50 mm shall be selected as given cl. 3 below and prepared as described in cl. 4 below.
  3. Before specimens for the standard test are cut, establish by the following preliminary  tests which type of specimen gives the highest observed burning rate :
 

Unraised Fabrics :

  • Test no specimen cut in the warp or length direction of the fabric and one cut in the weft or width direction.  If there is a face side to the fabric these specimens shall be tested with the face side uppermost and two additional specimens shall be tested with the face side downward.
 

Raised Fabrics :

  • Fabrics raised on one surface only are always tested with the raised surface uppermost.  Prepare four specimens with two cut in warp direction and two in weft direction.  Test one specimens each of warp and weft direction with lie of the nap or pills upwards and others with lie downwards.
 
  1. Cut Five specimens of the type shown by the preliminary tests as above to tive the highest burning rate, and mount them in the specimen holders.

BRUSHING OF SPECIMEN

  1. All specimens from raised fabrics should be brushed in brushing device before conducting the test.  The unraised fabrics do not require brushing.
  2. Raise the brush holder clear above the carriage.  Put the specimen with specimen holder on the carriage and hold it their with the help of clamps.
  3. Move the carriage to its extreme position.
  4. Swivel back the brushing holder so that the bristle of brush rests on the sample.
  5. Slowly move the carriage so that the brush is drawn on the specimen.  

Note :

Care should be taken that the direction of the brushing is against the life, if any, of the surface fibres. 

CONDITIONING AND TESTING ATMOSPHERE

  • Conditioning :

Dry the specimen for test, already cut and mounted in their holders for 30 minutes in a ventilated drying over and maintained at 1050 + 300 C.  Cool each specimen, still in its specimen holder in a desiccator.  Keep each specimen enclosed until immediately before the test. 

  • Testing Atmosphere :

Carry out the test in an atmosphere of relative humidity between 20% and 80% and temperature between 200C to 350 C. 

PROCEDURE.

  1. Rotate the cam switch to ‘ON’ position andre-set the timer.
  2. For adjustment of position of rack follow procedure given below :
  • Check that the distance between the top of the gas nozzle and the gauge rod fixed above the nozzle is 16 mm.  If it is not so adjust the nozzle to make it so.
  • Put a holder with a trial specimen (not a prepared specimen) of the cloth under test in the position on the rack such that ‘U’ Cut of the holder is downward and top pin of the holder is resting on the head of the setting screw of the rack.  Clamp it in this position.
  • With the help of hand wheel on the side of enclosure move the rack away fro the gas nozzle.  Hook one of the hook of the stop thread to the hook of the miniature switch behind the rack.  Guide the thread over both the pulleys of rack and hang the weight to the second hook of the thread.
  • Set the thumb wheel of the timer to 50 seconds.  Press the button below the timer to rotate the motor shaft.  Keep it pressing till the gas nozzle become vertical to the sample and stop automatically in that position.

Note :

In case the gas nozzle is not vertical to the sample, adjust the limit switches at the back to make it so. 

  • Again rotate the hand wheel to move the rack with specimen holder towards the gas nozzle till the head of the adjusting rod fitted on the extension of the motor behind the gas nozzle just touches the specimen holder.  In such position the tip of the gas nozzle should be mm from the surface of the sample in manner that and such a position so that the flame would impinge at the vertical centre of the specimen 6 mm from the bottom of the specimen.

Note :

It is observed that above conditions are not being meet, adjust as given below :

  1. In case the tip of the gas nozzle is not 8 mm from the face of the specimen, adjust the adjusting rod behind gas nozzle, so that when its head touches the specimen holder, surface of the sample is 8mm away from the top of the gas nozzle.
  2. In case it appears that if the flame is applied it would have impinged on the specimen at a distance other than 6 mm from the bottom of the specimen, adjust the adjusting screw on top of the rack so that whole sample holder, the pin top of which is resting on the head of the screw is slided upward or downward to make the distance as 6 mm.
    • At the end of 50 sec. of rotating of the motor, the motor would automatically rotate back to make the gas nozzle vertical.  Remove the weight on the thread.  This is equivalent to burning of the thread and this would stop the timer.
 
  1. Open the Control valve of the fuel supply and allow approximately 5 minutes for the air to be driven from the fuel line.  Ignite the gas and adjust the flame with the help of the control valve so that it burns steadily and has a length of 16 mm measured from the tip of the flame to the nozzle of the burner as indicated by the gauge rod.
  2. Set the thumb wheel of the timer to read 1 sec.  (This is the time specified for application of flame.  In case of the some specification where time of application of flame is different than 1 sec. set that time with thumb wheel.).
  3. Remove one fabric specimen with specimen holder from the desiccator and place it in position on the specimen rack.  Clamp it in this position.  Thread the stop thread with one hook attached to the thread of the miniature switch and the thread passing over both the pulleys on the rack and then the weight hanging on the second hook.  With this arrangement the thread is passing over the sample, parallel to its surface at a distance of 127 mm from the point of impingement of flame and kept taut with switch on one side and the weight on the other.

Note :

Five threads with two stainless steel wire hooks tied on both ends are provided with the equipment.  Which is enough only for one set of testing.  For further testing, use the same hooks and prepare stop thread using no.  50 mercerised sewing thread. 

  1. Close the door.  Re-set the timer.  Press the push switch which would start the rotation of the motor, keep it pressing till the motor stops automatically with the flame being impinged on the sample.  The timer would start automatically as soon as the gas nozzle    become vertical to the sample.

Note :

The sample should be exposed to the flame within 45s of the time, it was removed from the dessicator. 

  1. In 2 sec. (or after the time of set on the thumb sheet of the timer) the motor would rotate back to make the flame vertical.  The timer would continue timing till the weight is released by burning of the stop thread.  This would give time of flame spread.
  2. Record the time of the flame spread for each specimen and note whether the base of each specimen having raised fibre surface is ignited or fused to a point where the damage is apparent from the bottom of the specimen.  Repeat the procedure until all the give specimen have been tested.

CALCULATIONS

Calculate the arithmetic mean of flame spread time of the five specimens.  It this time is less than 3.5 s or if some of the specimens do not burn, test five additional specimens.  The time of flame spread shall than be the average time for the ten specimens or for as many of them that burn.

REPORT

The report shall include the following : 

Average time of flame spread for the five or ten specimens or for the number of specimens that burn before and after dry cleaning or washing separately ; and 

The ignition or fusing of the base fabric of textiles having a raised fibre surface when the base fabric of more than one of the five (or two of the ten) specimens tested ignited or fuses, before and after dry cleaning or washing separately. 
 

OUR POLICY IS OF CONTINIOUS DEVELOPMENT AND IMPROVEMENT, ALL TECHNICAL DATA / SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE





© Copyright 2016. Innolab India, Delhi, India


Home